Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files? [aarch64 test did not reproduce the issue]

2021-05-05 Thread Mark Millard via freebsd-current
On 2021-May-4, at 20:26, Mark Millard  wrote:

> On 2021-May-4, at 13:38, Mark Millard  wrote:
> 
>> [The first buidlworld is still in process. So while waiting . . .]
>> 
>> On 2021-May-4, at 10:31, Mark Millard  wrote:
>> 
>>> I probably know why the huge count of differences this time
>>> unlike the original report . . .
>>> 
>>> Previously I built based on a checked-in branch as part of
>>> my experimenting. This time it was in a -dirty form (not
>>> checked in), again as part of my experimental exploration.
>>> 
>>> WITH_REPRODUCIBLE_BUILD= makes a distinction between these
>>> if I remember right: (partially?) disabling itself for
>>> -dirty style.
>>> 
>>> To reproduce the original style of test I need to create
>>> a branch with my few patches checked in and do the
>>> buildworlds from that branch.
>>> 
>>> This will, of course, take a while.
>>> 
>>> Sorry for the noise.
>>> 
>> 
>> I've confirmed some of the details of the large number of
>> files with difference while waiting for the 1st buildworld :
>> 
>> The 4 bytes at the end of the .gnu_debuglink section
>> that are ending up different are the checksum for the
>> .debug file. The .debug files have differences such as:
>> 
>> │ -<1a>   DW_AT_comp_dir: (indirect string) 
>> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/usr/13_0R-src/arm64.aarch64/lib/csu/aarch64
>> │ +<1a>   DW_AT_comp_dir: (indirect string) 
>> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang/usr/13_0R-src/arm64.aarch64/lib/csu/aarch64
>> 
>> So I need to build, snapshot (in case need
>> to reference), install, clean-out, build,
>> install elsewhere, compare. (Or analogous
>> that uses the same build base-path for both
>> installs despite separate buildworld's.)
>> This is separate from any potential -dirty
>> vs. checked-in handling variation by
>> WITH_REPRODUCIBLE_BUILD= .
>> 
>> My process that produced the original armv7
>> report happened to do that before I accidentally
>> discovered the presence of the few files with
>> differences. My new experiments were different
>> and I'd not though of needing to vary the
>> procedure to get you the right evidence.
>> 
> 
> The two aarch64 test installs did not show any
> differences in a "diff -rq" . Ignoring *.meta
> files generated during the builds, the build
> directory tree snapshots showed just the
> differences:
> 
> # diff -rq 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr 
> | grep -v '\.meta' | more
> Files 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr/13_0R-src/arm64.aarch64/stand/ficl/softcore.c
>  and 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr/13_0R-src/arm64.aarch64/stand/ficl/softcore.c
>  differ
> Files 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr/13_0R-src/arm64.aarch64/toolchain-metadata.mk
>  and 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr/13_0R-src/arm64.aarch64/toolchain-metadata.mk
>  differ
> 
> # diff -u 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr/13_0R-src/arm64.aarch64/stand/ficl/softcore.c
>  
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr/13_0R-src/arm64.aarch64/stand/ficl/softcore.c
> --- 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr/13_0R-src/arm64.aarch64/stand/ficl/softcore.c
>  2021-05-04 13:45:14.463351000 -0700
> +++ 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr/13_0R-src/arm64.aarch64/stand/ficl/softcore.c
>  2021-05-04 19:04:32.338203000 -0700
> @@ -4,7 +4,7 @@
> ** Words from CORE set written in FICL
> ** Author: John Sadler (john_sad...@alum.mit.edu)
> ** Created: 27 December 1997
> -** Last update: Tue May  4 13:45:14 PDT 2021
> +** Last update: Tue May  4 19:04:32 PDT 2021
> ***/
> /*
> ** DO NOT EDIT THIS FILE -- it is generated by softwords/softcore.awk
> 
> # diff -u 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr/13_0R-src/arm64.aarch64/toolchain-metadata.mk
>  
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr/13_0R-src/arm64.aarch64/toolchain-metadata.mk
> --- 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr/13_0R-src/arm64.aarch64/toolchain-metadata.mk
>  2021-05-04 10:55:26.030179000 -0700
> +++ 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr/13_0R-src/arm64.aarch64/toolchain-metadata.mk
>  2021-05-04 16:14:24.513346000 -0700
> @@ -1,4 +1,4 @@
> -.info Using cached toolchain metadata from build at CA72_4c8G_ZFS on Tue May 
>  4 10:55:26 PDT 2021
> +.info Using cached toolchain metadata from build at CA72_4c8G_ZFS on Tue May 
>  4 16:14:24 PDT 2021
> _LOADED_TOOLCHAIN_METADATA=t
> COMPILER_VERSIO

Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files? [aarch64 test did not reproduce the issue]

2021-05-04 Thread Mark Millard via freebsd-current


On 2021-May-4, at 13:38, Mark Millard  wrote:

> [The first buidlworld is still in process. So while waiting . . .]
> 
> On 2021-May-4, at 10:31, Mark Millard  wrote:
> 
>> I probably know why the huge count of differences this time
>> unlike the original report . . .
>> 
>> Previously I built based on a checked-in branch as part of
>> my experimenting. This time it was in a -dirty form (not
>> checked in), again as part of my experimental exploration.
>> 
>> WITH_REPRODUCIBLE_BUILD= makes a distinction between these
>> if I remember right: (partially?) disabling itself for
>> -dirty style.
>> 
>> To reproduce the original style of test I need to create
>> a branch with my few patches checked in and do the
>> buildworlds from that branch.
>> 
>> This will, of course, take a while.
>> 
>> Sorry for the noise.
>> 
> 
> I've confirmed some of the details of the large number of
> files with difference while waiting for the 1st buildworld :
> 
> The 4 bytes at the end of the .gnu_debuglink section
> that are ending up different are the checksum for the
> .debug file. The .debug files have differences such as:
> 
> │ -<1a>   DW_AT_comp_dir: (indirect string) 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/usr/13_0R-src/arm64.aarch64/lib/csu/aarch64
> │ +<1a>   DW_AT_comp_dir: (indirect string) 
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang/usr/13_0R-src/arm64.aarch64/lib/csu/aarch64
> 
> So I need to build, snapshot (in case need
> to reference), install, clean-out, build,
> install elsewhere, compare. (Or analogous
> that uses the same build base-path for both
> installs despite separate buildworld's.)
> This is separate from any potential -dirty
> vs. checked-in handling variation by
> WITH_REPRODUCIBLE_BUILD= .
> 
> My process that produced the original armv7
> report happened to do that before I accidentally
> discovered the presence of the few files with
> differences. My new experiments were different
> and I'd not though of needing to vary the
> procedure to get you the right evidence.
> 

The two aarch64 test installs did not show any
differences in a "diff -rq" . Ignoring *.meta
files generated during the builds, the build
directory tree snapshots showed just the
differences:

# diff -rq 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr | 
grep -v '\.meta' | more
Files 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr/13_0R-src/arm64.aarch64/stand/ficl/softcore.c
 and 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr/13_0R-src/arm64.aarch64/stand/ficl/softcore.c
 differ
Files 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr/13_0R-src/arm64.aarch64/toolchain-metadata.mk
 and 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr/13_0R-src/arm64.aarch64/toolchain-metadata.mk
 differ

# diff -u 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr/13_0R-src/arm64.aarch64/stand/ficl/softcore.c
 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr/13_0R-src/arm64.aarch64/stand/ficl/softcore.c
--- 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr/13_0R-src/arm64.aarch64/stand/ficl/softcore.c
 2021-05-04 13:45:14.463351000 -0700
+++ 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr/13_0R-src/arm64.aarch64/stand/ficl/softcore.c
 2021-05-04 19:04:32.338203000 -0700
@@ -4,7 +4,7 @@
 ** Words from CORE set written in FICL
 ** Author: John Sadler (john_sad...@alum.mit.edu)
 ** Created: 27 December 1997
-** Last update: Tue May  4 13:45:14 PDT 2021
+** Last update: Tue May  4 19:04:32 PDT 2021
 ***/
 /*
 ** DO NOT EDIT THIS FILE -- it is generated by softwords/softcore.awk

# diff -u 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr/13_0R-src/arm64.aarch64/toolchain-metadata.mk
 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr/13_0R-src/arm64.aarch64/toolchain-metadata.mk
--- 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-0/usr/13_0R-src/arm64.aarch64/toolchain-metadata.mk
 2021-05-04 10:55:26.030179000 -0700
+++ 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/.zfs/snapshot/commited-style-1/usr/13_0R-src/arm64.aarch64/toolchain-metadata.mk
 2021-05-04 16:14:24.513346000 -0700
@@ -1,4 +1,4 @@
-.info Using cached toolchain metadata from build at CA72_4c8G_ZFS on Tue May  
4 10:55:26 PDT 2021
+.info Using cached toolchain metadata from build at CA72_4c8G_ZFS on Tue May  
4 16:14:24 PDT 2021
 _LOADED_TOOLCHAIN_METADATA=t
 COMPILER_VERSION=110001
 X_COMPILER_VERSION=110001



I may run a 'target cortex-a7 (so: armv7) from aarch64' test
next. That was the context for the original discovery and
report.



===
Mark Millard
marklmi at yahoo.com
( ds

Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files? [Ignore recent test: -dirty vs. checked-in usage difference]

2021-05-04 Thread Mark Millard via freebsd-current
[The first buidlworld is still in process. So while waiting . . .]

On 2021-May-4, at 10:31, Mark Millard  wrote:

> I probably know why the huge count of differences this time
> unlike the original report . . .
> 
> Previously I built based on a checked-in branch as part of
> my experimenting. This time it was in a -dirty form (not
> checked in), again as part of my experimental exploration.
> 
> WITH_REPRODUCIBLE_BUILD= makes a distinction between these
> if I remember right: (partially?) disabling itself for
> -dirty style.
> 
> To reproduce the original style of test I need to create
> a branch with my few patches checked in and do the
> buildworlds from that branch.
> 
> This will, of course, take a while.
> 
> Sorry for the noise.
> 

I've confirmed some of the details of the large number of
files with difference while waiting for the 1st buildworld :

The 4 bytes at the end of the .gnu_debuglink section
that are ending up different are the checksum for the
.debug file. The .debug files have differences such as:

│ -<1a>   DW_AT_comp_dir: (indirect string) 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt/usr/13_0R-src/arm64.aarch64/lib/csu/aarch64
│ +<1a>   DW_AT_comp_dir: (indirect string) 
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang/usr/13_0R-src/arm64.aarch64/lib/csu/aarch64

So I need to build, snapshot (in case need
to reference), install, clean-out, build,
install elsewhere, compare. (Or analogous
that uses the same build base-path for both
installs despite separate buildworld's.)
This is separate from any potential -dirty
vs. checked-in handling variation by
WITH_REPRODUCIBLE_BUILD= .

My process that produced the original armv7
report happened to do that before I accidentally
discovered the presence of the few files with
differences. My new experiments were different
and I'd not though of needing to vary the
procedure to get you the right evidence.


===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)

___
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Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files? [Ignore recent test: -dirty vs. checked-in usage difference]

2021-05-04 Thread Mark Millard via freebsd-current
I probably know why the huge count of differences this time
unlike the original report . . .

Previously I built based on a checked-in branch as part of
my experimenting. This time it was in a -dirty form (not
checked in), again as part of my experimental exploration.

WITH_REPRODUCIBLE_BUILD= makes a distinction between these
if I remember right: (partially?) disabling itself for
-dirty style.

To reproduce the original style of test I need to create
a branch with my few patches checked in and do the
buildworlds from that branch.

This will, of course, take a while.

Sorry for the noise.



===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)

___
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https://lists.freebsd.org/mailman/listinfo/freebsd-current
To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"


Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files?

2021-05-04 Thread Mark Millard via freebsd-current
[Just adding readelf -S info since it seems to show more.]

On 2021-May-4, at 10:01, Mark Millard  wrote:


> On 2021-May-4, at 08:51, Mark Millard  wrote:
> 
>> On 2021-May-4, at 06:01, Ed Maste  wrote:
>> 
>>> On Mon, 3 May 2021 at 22:26, Mark Millard  wrote:
 
 But I'll note that I've built and stalled py37-diffoscope
 (new to me). A basic quick test showed that it reports:
 
 W: diffoscope.main: Fuzzy-matching is currently disabled as the "tlsh" 
 module is unavailable.
>>> 
>>> I just looked up tlsh - its "A Locality Sensitive Hash"; I presume
>>> diffoscope uses it to infer file renames. I believe the warning
>>> emitted here should have no impact on the output we're looking for.
>> 
>> Okay.
>> 
>>> As far as the utf-8 issues go, diffoscope requires a utf-8 locale and
>>> I suspect that is the issue. If you don't have LANG set already, try
>>> setting LANG=C.UTF-8 in your environment.
>> 
>> That is not the issue for the UnicodeDecodeError:
>> 
>> # echo $LANG
>> C.UTF-8
>> 
>> # diffoscope /.zfs/snapshot/2021-04-*-01:40:48-0/bin/sh
>> $<3/>2021-05-04 08:49:21 W: diffoscope.main: Fuzzy-matching is currently 
>> disabled as the "tlsh" module is unavailable.
>> $<3/>Traceback (most recent call last):
>> File "/usr/local/lib/python3.7/site-packages/diffoscope/main.py", line 745, 
>> in main
>>   sys.exit(run_diffoscope(parsed_args))
>> File "/usr/local/lib/python3.7/site-packages/diffoscope/main.py", line 677, 
>> in run_diffoscope
>>   difference = load_diff_from_path(path1)
>> File 
>> "/usr/local/lib/python3.7/site-packages/diffoscope/readers/__init__.py", 
>> line 31, in load_diff_from_path
>>   return load_diff(codecs.getreader("utf-8")(fp), path)
>> File 
>> "/usr/local/lib/python3.7/site-packages/diffoscope/readers/__init__.py", 
>> line 35, in load_diff
>>   return JSONReaderV1().load(fp, path)
>> File "/usr/local/lib/python3.7/site-packages/diffoscope/readers/json.py", 
>> line 33, in load
>>   raw = json.load(fp)
>> File "/usr/local/lib/python3.7/json/__init__.py", line 293, in load
>>   return loads(fp.read(),
>> File "/usr/local/lib/python3.7/codecs.py", line 504, in read
>>   newchars, decodedbytes = self.decode(data, self.errors)
>> UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb7 in position 18: 
>> invalid start byte
>> 
> 
> Well, the list of differing files is huge. But this seems to
> be .gnu_debuglink content for the area it is in.

Specifically: the last 4 bytes of the .gnu_debuglink section.

> I'll note
> that I did installworld but not the likes of distrib-dirs
> or distribution this time.
> 
> This test did buildworld to two distinct directories:
> 
> zroot/BUILDs/13_0R-CA72-nodbg-clang   5.13G   118G 5.13G  
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang
> zroot/BUILDs/13_0R-CA72-nodbg-clang-alt   4.28G   118G 4.28G  
> /usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt
> 
> and installworld to 2 distinct directories:
> 
> zroot/DESTDIRs/13_0R-CA72-instwrld-alt1.44G   118G 1.44G  
> /usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt
> zroot/DESTDIRs/13_0R-CA72-instwrld-norm   1.44G   118G 1.44G  
> /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm
> 
> Previously (armv7 target) I had built, installed, rebuilt
> to same directory (after clean-out) and installed to an
> alternate directory. That had gotten only a few files
> different but I do not know (yet) if it was the procedural
> difference that made the difference.
> 
> Prefix of the list of different files this time:
> 
> # diff -rq /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/ 
> /usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/ | more
> Files /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/[ and 
> /usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/[ differ
> Files /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/cat and 
> /usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/cat differ
> Files /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/chflags and 
> /usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/chflags differ
> Files /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/chio and 
> /usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/chio differ
> . . .
> 
> Looking, aarch64 seems to typically get a back-to-back
> sequence of 4 bytes different in native programs in my
> builds:
> 
> # cmp -x /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/cat 
> /usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/cat
> 3bd4 1d 65
> 3bd5 eb a3
> 3bd6 bb ca
> 3bd7 8e 1a
> 
> # ls -Tld /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/cat 
> /usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/cat
> -r-xr-xr-x  1 root  wheel  18448 May  4 08:55:01 2021 
> /usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/cat
> -r-xr-xr-x  1 root  wheel  18448 May  3 23:16:36 2021 
> /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/cat
> 
> Sections:
> Idx Name  Size  VMA   LMA   File off  Algn
> . . .
> 25 .gnu_debuglink 0010      3bc8  2**0
>  CONTENTS, READONLY

Section Header

Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files?

2021-05-04 Thread Mark Millard via freebsd-current


On 2021-May-4, at 08:51, Mark Millard  wrote:

> On 2021-May-4, at 06:01, Ed Maste  wrote:
> 
>> On Mon, 3 May 2021 at 22:26, Mark Millard  wrote:
>>> 
>>> But I'll note that I've built and stalled py37-diffoscope
>>> (new to me). A basic quick test showed that it reports:
>>> 
>>> W: diffoscope.main: Fuzzy-matching is currently disabled as the "tlsh" 
>>> module is unavailable.
>> 
>> I just looked up tlsh - its "A Locality Sensitive Hash"; I presume
>> diffoscope uses it to infer file renames. I believe the warning
>> emitted here should have no impact on the output we're looking for.
> 
> Okay.
> 
>> As far as the utf-8 issues go, diffoscope requires a utf-8 locale and
>> I suspect that is the issue. If you don't have LANG set already, try
>> setting LANG=C.UTF-8 in your environment.
> 
> That is not the issue for the UnicodeDecodeError:
> 
> # echo $LANG
> C.UTF-8
> 
> # diffoscope /.zfs/snapshot/2021-04-*-01:40:48-0/bin/sh
> $<3/>2021-05-04 08:49:21 W: diffoscope.main: Fuzzy-matching is currently 
> disabled as the "tlsh" module is unavailable.
> $<3/>Traceback (most recent call last):
>  File "/usr/local/lib/python3.7/site-packages/diffoscope/main.py", line 745, 
> in main
>sys.exit(run_diffoscope(parsed_args))
>  File "/usr/local/lib/python3.7/site-packages/diffoscope/main.py", line 677, 
> in run_diffoscope
>difference = load_diff_from_path(path1)
>  File 
> "/usr/local/lib/python3.7/site-packages/diffoscope/readers/__init__.py", line 
> 31, in load_diff_from_path
>return load_diff(codecs.getreader("utf-8")(fp), path)
>  File 
> "/usr/local/lib/python3.7/site-packages/diffoscope/readers/__init__.py", line 
> 35, in load_diff
>return JSONReaderV1().load(fp, path)
>  File "/usr/local/lib/python3.7/site-packages/diffoscope/readers/json.py", 
> line 33, in load
>raw = json.load(fp)
>  File "/usr/local/lib/python3.7/json/__init__.py", line 293, in load
>return loads(fp.read(),
>  File "/usr/local/lib/python3.7/codecs.py", line 504, in read
>newchars, decodedbytes = self.decode(data, self.errors)
> UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb7 in position 18: 
> invalid start byte
> 

Well, the list of differing files is huge. But this seems to
be .gnu_debuglink content for the area it is in. I'll note
that I did installworld but not the likes of distrib-dirs
or distribution this time.

This test did buildworld to two distinct directories:

zroot/BUILDs/13_0R-CA72-nodbg-clang   5.13G   118G 5.13G  
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang
zroot/BUILDs/13_0R-CA72-nodbg-clang-alt   4.28G   118G 4.28G  
/usr/obj/BUILDs/13_0R-CA72-nodbg-clang-alt

and installworld to 2 distinct directories:

zroot/DESTDIRs/13_0R-CA72-instwrld-alt1.44G   118G 1.44G  
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt
zroot/DESTDIRs/13_0R-CA72-instwrld-norm   1.44G   118G 1.44G  
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm

Previously (armv7 target) I had built, installed, rebuilt
to same directory (after clean-out) and installed to an
alternate directory. That had gotten only a few files
different but I do not know (yet) if it was the procedural
difference that made the difference.

Prefix of the list of different files this time:

# diff -rq /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/ 
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/ | more
Files /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/[ and 
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/[ differ
Files /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/cat and 
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/cat differ
Files /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/chflags and 
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/chflags differ
Files /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/chio and 
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/chio differ
. . .

Looking, aarch64 seems to typically get a back-to-back
sequence of 4 bytes different in native programs in my
builds:

# cmp -x /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/cat 
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/cat
3bd4 1d 65
3bd5 eb a3
3bd6 bb ca
3bd7 8e 1a

# ls -Tld /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/cat 
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/cat
-r-xr-xr-x  1 root  wheel  18448 May  4 08:55:01 2021 
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/cat
-r-xr-xr-x  1 root  wheel  18448 May  3 23:16:36 2021 
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/cat

Sections:
Idx Name  Size  VMA   LMA   File off  Algn
. . .
 25 .gnu_debuglink 0010      3bc8  2**0
  CONTENTS, READONLY

3bd4-3bc8 == 0xC

# cmp -x /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/chflags 
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/chflags
2208 88 a1
2209 e6 40
220a 60 94
220b bf ce

# ls -Tld /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/bin/chflags 
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-alt/bin/chflags
-r-xr-xr-x  1 root  wheel  

Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files?

2021-05-04 Thread Ed Maste
On Tue, 4 May 2021 at 11:52, Mark Millard  wrote:
>
> > As far as the utf-8 issues go, diffoscope requires a utf-8 locale and
> > I suspect that is the issue. If you don't have LANG set already, try
> > setting LANG=C.UTF-8 in your environment.
>
> That is not the issue for the UnicodeDecodeError:
>
> # echo $LANG
> C.UTF-8
>
> # diffoscope /.zfs/snapshot/2021-04-*-01:40:48-0/bin/sh
> [...]
> $<3/>2021-05-04 08:49:21 W: diffoscope.main: Fuzzy-matching is currently 
> disabled as the "tlsh" module is unavailable.
> UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb7 in position 18: 
> invalid start byte

Hmm, interesting - if you don't mind sharing I'd be interested in a
copy of /.zfs/snapshot/2021-04-*-01:40:48-0/bin/sh, in order to track
down what appears to be a diffoscope issue.

To investigate the non-reproducibility though we can just manually run
through the same sort of process that Diffoscope uses. I would suggest
cmp -x   to find the offsets of the difference(s), then
use readelf -S  to determine which section(s) have differences.
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Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files?

2021-05-04 Thread Mark Millard via freebsd-current



On 2021-May-4, at 06:01, Ed Maste  wrote:

> On Mon, 3 May 2021 at 22:26, Mark Millard  wrote:
>> 
>> But I'll note that I've built and stalled py37-diffoscope
>> (new to me). A basic quick test showed that it reports:
>> 
>> W: diffoscope.main: Fuzzy-matching is currently disabled as the "tlsh" 
>> module is unavailable.
> 
> I just looked up tlsh - its "A Locality Sensitive Hash"; I presume
> diffoscope uses it to infer file renames. I believe the warning
> emitted here should have no impact on the output we're looking for.

Okay.

> As far as the utf-8 issues go, diffoscope requires a utf-8 locale and
> I suspect that is the issue. If you don't have LANG set already, try
> setting LANG=C.UTF-8 in your environment.

That is not the issue for the UnicodeDecodeError:

# echo $LANG
C.UTF-8

# diffoscope /.zfs/snapshot/2021-04-*-01:40:48-0/bin/sh
$<3/>2021-05-04 08:49:21 W: diffoscope.main: Fuzzy-matching is currently 
disabled as the "tlsh" module is unavailable.
$<3/>Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/diffoscope/main.py", line 745, 
in main
sys.exit(run_diffoscope(parsed_args))
  File "/usr/local/lib/python3.7/site-packages/diffoscope/main.py", line 677, 
in run_diffoscope
difference = load_diff_from_path(path1)
  File "/usr/local/lib/python3.7/site-packages/diffoscope/readers/__init__.py", 
line 31, in load_diff_from_path
return load_diff(codecs.getreader("utf-8")(fp), path)
  File "/usr/local/lib/python3.7/site-packages/diffoscope/readers/__init__.py", 
line 35, in load_diff
return JSONReaderV1().load(fp, path)
  File "/usr/local/lib/python3.7/site-packages/diffoscope/readers/json.py", 
line 33, in load
raw = json.load(fp)
  File "/usr/local/lib/python3.7/json/__init__.py", line 293, in load
return loads(fp.read(),
  File "/usr/local/lib/python3.7/codecs.py", line 504, in read
newchars, decodedbytes = self.decode(data, self.errors)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb7 in position 18: 
invalid start byte

===
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Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files?

2021-05-04 Thread Ed Maste
On Mon, 3 May 2021 at 22:26, Mark Millard  wrote:
>
> But I'll note that I've built and stalled py37-diffoscope
> (new to me). A basic quick test showed that it reports:
>
> W: diffoscope.main: Fuzzy-matching is currently disabled as the "tlsh" module 
> is unavailable.

I just looked up tlsh - its "A Locality Sensitive Hash"; I presume
diffoscope uses it to infer file renames. I believe the warning
emitted here should have no impact on the output we're looking for.

As far as the utf-8 issues go, diffoscope requires a utf-8 locale and
I suspect that is the issue. If you don't have LANG set already, try
setting LANG=C.UTF-8 in your environment.
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Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files?

2021-05-04 Thread Mark Millard via freebsd-current



On 2021-May-3, at 21:27, Mark Millard  wrote:

> On 2021-May-3, at 19:26, Mark Millard  wrote:
> 
>> On 2021-May-3, at 10:51, Mark Millard  wrote:
>> 
>>> On 2021-May-3, at 07:47, Ed Maste  wrote:
>>> 
 On Thu, 29 Apr 2021 at 02:50, Mark Millard via freebsd-current
  wrote:
> 
> Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/sbin/ping and 
> /usr/obj/DESTDIRs/13_0R-CA7-poud/sbin/ping differ
> Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/sbin/ping6 and 
> /usr/obj/DESTDIRs/13_0R-CA7-poud/sbin/ping6 differ
> Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/bin/ntpq and 
> /usr/obj/DESTDIRs/13_0R-CA7-poud/usr/bin/ntpq differ...
 
 This is unexpected. Unfortunately I haven't looked at reproducibility
 in a while, and my work was all on x86. This could be a regression or
 a longstanding issue with arm64.
 
 If you install the diffoscope package (py37-diffoscope) and run it on
 the two directories / files it should give a more convenient view of
 the differences. (Or, if you can make a tarball of the differing files
 I can take a look.)
>>> 
>>> I no longer have the same content in those directory
>>> trees: newer rebuild and the same buildworld used to
>>> installworld to both places, instead of 2 different
>>> buildworld's. I'm also unsure how reproducible getting
>>> differences was.
>>> 
>>> I can eventually do experiments to test multiple separate
>>> buildworld's and installworld's, but the machine is busy
>>> building ports and the llvm builds involved means it
>>> will be some time before I'd switch activities. And the
>>> buildworld's involve llvm builds as well and take notable
>>> time themselves. So my next comparison will not be any
>>> time soon.
>>> 
>>> I'll let you know if I manage to generate another example,
>>> this time being sure to keep the data. If I try multiple
>>> times without finding any differences, I'll eventually
>>> decide "enough is enough" and let you know.
>> 
>> I've still got a long ways to go to do the first
>> actual comparison of builds.
>> 
>> But I'll note that I've built and stalled py37-diffoscope
>> (new to me). A basic quick test showed that it reports:
>> 
>> W: diffoscope.main: Fuzzy-matching is currently disabled as the "tlsh" 
>> module is unavailable.
>> 
>> As I'm not familiar with the tool, you might need to send
>> notes about how you want me to use the tool to get the
>> output that you would want. (And, so, I get to learn . . .)
> 
> I've tried another experiment (* in the path matches "28" and "30"):
> 
> # diffoscope /.zfs/snapshot/2021-04-*-01:40:48-0/bin/sh
> $<3/>2021-05-03 21:08:48 W: diffoscope.main: Fuzzy-matching is currently 
> disabled as the "tlsh" module is unavailable.
> $<3/>Traceback (most recent call last):
>  File "/usr/local/lib/python3.7/site-packages/diffoscope/main.py", line 745, 
> in main
>sys.exit(run_diffoscope(parsed_args))
>  File "/usr/local/lib/python3.7/site-packages/diffoscope/main.py", line 677, 
> in run_diffoscope
>difference = load_diff_from_path(path1)
>  File 
> "/usr/local/lib/python3.7/site-packages/diffoscope/readers/__init__.py", line 
> 31, in load_diff_from_path
>return load_diff(codecs.getreader("utf-8")(fp), path)
>  File 
> "/usr/local/lib/python3.7/site-packages/diffoscope/readers/__init__.py", line 
> 35, in load_diff
>return JSONReaderV1().load(fp, path)
>  File "/usr/local/lib/python3.7/site-packages/diffoscope/readers/json.py", 
> line 33, in load
>raw = json.load(fp)
>  File "/usr/local/lib/python3.7/json/__init__.py", line 293, in load
>return loads(fp.read(),
>  File "/usr/local/lib/python3.7/codecs.py", line 504, in read
>newchars, decodedbytes = self.decode(data, self.errors)
> UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb7 in position 18: 
> invalid start byte
> 
> The two older snapshots of a Boot Environment have
> bin/sh files that compare equal. But every program I
> tried the above sort of thing against on got the same
> UnicodeDecodeError result from diffoscope, byte value
> and position matching.
> 
> These snapshots have more than an installworld in them
> and so are messy to compare overall. But the
> installworld (and installkernel) content show similar
> differences to what I reported before as far as
> example files with differences go. But this is aarch64,
> not armv7.
> 
> It will still be notable time before I have simple
> installworld tree's to compare.

While waiting for the 2nd buildworld to complete, I used
the 1st buildworld's materials to installworld twice (to
different, empty directory trees) and then did a diff.
The diff reported:

# diff -rq /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/ 
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm2/ | more
diff: /usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/usr/tests/local: No such file 
or directory
diff: 
/usr/obj/DESTDIRs/13_0R-CA72-instwrld-norm/usr/tests/sys/pjdfstest/tests/tests/tests/tests/tests/tests/tests/tests/tests/tests/tests/tests/tests

Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files?

2021-05-03 Thread Mark Millard via freebsd-current
On 2021-May-3, at 19:26, Mark Millard  wrote:

> On 2021-May-3, at 10:51, Mark Millard  wrote:
> 
>> On 2021-May-3, at 07:47, Ed Maste  wrote:
>> 
>>> On Thu, 29 Apr 2021 at 02:50, Mark Millard via freebsd-current
>>>  wrote:
 
 Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/sbin/ping and 
 /usr/obj/DESTDIRs/13_0R-CA7-poud/sbin/ping differ
 Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/sbin/ping6 and 
 /usr/obj/DESTDIRs/13_0R-CA7-poud/sbin/ping6 differ
 Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/bin/ntpq and 
 /usr/obj/DESTDIRs/13_0R-CA7-poud/usr/bin/ntpq differ...
>>> 
>>> This is unexpected. Unfortunately I haven't looked at reproducibility
>>> in a while, and my work was all on x86. This could be a regression or
>>> a longstanding issue with arm64.
>>> 
>>> If you install the diffoscope package (py37-diffoscope) and run it on
>>> the two directories / files it should give a more convenient view of
>>> the differences. (Or, if you can make a tarball of the differing files
>>> I can take a look.)
>> 
>> I no longer have the same content in those directory
>> trees: newer rebuild and the same buildworld used to
>> installworld to both places, instead of 2 different
>> buildworld's. I'm also unsure how reproducible getting
>> differences was.
>> 
>> I can eventually do experiments to test multiple separate
>> buildworld's and installworld's, but the machine is busy
>> building ports and the llvm builds involved means it
>> will be some time before I'd switch activities. And the
>> buildworld's involve llvm builds as well and take notable
>> time themselves. So my next comparison will not be any
>> time soon.
>> 
>> I'll let you know if I manage to generate another example,
>> this time being sure to keep the data. If I try multiple
>> times without finding any differences, I'll eventually
>> decide "enough is enough" and let you know.
> 
> I've still got a long ways to go to do the first
> actual comparison of builds.
> 
> But I'll note that I've built and stalled py37-diffoscope
> (new to me). A basic quick test showed that it reports:
> 
> W: diffoscope.main: Fuzzy-matching is currently disabled as the "tlsh" module 
> is unavailable.
> 
> As I'm not familiar with the tool, you might need to send
> notes about how you want me to use the tool to get the
> output that you would want. (And, so, I get to learn . . .)

I've tried another experiment (* in the path matches "28" and "30"):

# diffoscope /.zfs/snapshot/2021-04-*-01:40:48-0/bin/sh
$<3/>2021-05-03 21:08:48 W: diffoscope.main: Fuzzy-matching is currently 
disabled as the "tlsh" module is unavailable.
$<3/>Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/diffoscope/main.py", line 745, 
in main
sys.exit(run_diffoscope(parsed_args))
  File "/usr/local/lib/python3.7/site-packages/diffoscope/main.py", line 677, 
in run_diffoscope
difference = load_diff_from_path(path1)
  File "/usr/local/lib/python3.7/site-packages/diffoscope/readers/__init__.py", 
line 31, in load_diff_from_path
return load_diff(codecs.getreader("utf-8")(fp), path)
  File "/usr/local/lib/python3.7/site-packages/diffoscope/readers/__init__.py", 
line 35, in load_diff
return JSONReaderV1().load(fp, path)
  File "/usr/local/lib/python3.7/site-packages/diffoscope/readers/json.py", 
line 33, in load
raw = json.load(fp)
  File "/usr/local/lib/python3.7/json/__init__.py", line 293, in load
return loads(fp.read(),
  File "/usr/local/lib/python3.7/codecs.py", line 504, in read
newchars, decodedbytes = self.decode(data, self.errors)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xb7 in position 18: 
invalid start byte

The two older snapshots of a Boot Environment have
bin/sh files that compare equal. But every program I
tried the above sort of thing against on got the same
UnicodeDecodeError result from diffoscope, byte value
and position matching.

These snapshots have more than an installworld in them
and so are messy to compare overall. But the
installworld (and installkernel) content show similar
differences to what I reported before as far as
example files with differences go. But this is aarch64,
not armv7.

It will still be notable time before I have simple
installworld tree's to compare.

===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)

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Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files?

2021-05-03 Thread Mark Millard via freebsd-current
On 2021-May-3, at 10:51, Mark Millard  wrote:

> On 2021-May-3, at 07:47, Ed Maste  wrote:
> 
>> On Thu, 29 Apr 2021 at 02:50, Mark Millard via freebsd-current
>>  wrote:
>>> 
>>> Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/sbin/ping and 
>>> /usr/obj/DESTDIRs/13_0R-CA7-poud/sbin/ping differ
>>> Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/sbin/ping6 and 
>>> /usr/obj/DESTDIRs/13_0R-CA7-poud/sbin/ping6 differ
>>> Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/bin/ntpq and 
>>> /usr/obj/DESTDIRs/13_0R-CA7-poud/usr/bin/ntpq differ...
>> 
>> This is unexpected. Unfortunately I haven't looked at reproducibility
>> in a while, and my work was all on x86. This could be a regression or
>> a longstanding issue with arm64.
>> 
>> If you install the diffoscope package (py37-diffoscope) and run it on
>> the two directories / files it should give a more convenient view of
>> the differences. (Or, if you can make a tarball of the differing files
>> I can take a look.)
> 
> I no longer have the same content in those directory
> trees: newer rebuild and the same buildworld used to
> installworld to both places, instead of 2 different
> buildworld's. I'm also unsure how reproducible getting
> differences was.
> 
> I can eventually do experiments to test multiple separate
> buildworld's and installworld's, but the machine is busy
> building ports and the llvm builds involved means it
> will be some time before I'd switch activities. And the
> buildworld's involve llvm builds as well and take notable
> time themselves. So my next comparison will not be any
> time soon.
> 
> I'll let you know if I manage to generate another example,
> this time being sure to keep the data. If I try multiple
> times without finding any differences, I'll eventually
> decide "enough is enough" and let you know.

I've still got a long ways to go to do the first
actual comparison of builds.

But I'll note that I've built and stalled py37-diffoscope
(new to me). A basic quick test showed that it reports:

W: diffoscope.main: Fuzzy-matching is currently disabled as the "tlsh" module 
is unavailable.

As I'm not familiar with the tool, you might need to send
notes about how you want me to use the tool to get the
output that you would want. (And, so, I get to learn . . .)

===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)


===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)

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Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files?

2021-05-03 Thread Mark Millard via freebsd-current



On 2021-May-3, at 07:47, Ed Maste  wrote:

> On Thu, 29 Apr 2021 at 02:50, Mark Millard via freebsd-current
>  wrote:
>> 
>> Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/sbin/ping and 
>> /usr/obj/DESTDIRs/13_0R-CA7-poud/sbin/ping differ
>> Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/sbin/ping6 and 
>> /usr/obj/DESTDIRs/13_0R-CA7-poud/sbin/ping6 differ
>> Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/bin/ntpq and 
>> /usr/obj/DESTDIRs/13_0R-CA7-poud/usr/bin/ntpq differ...
> 
> This is unexpected. Unfortunately I haven't looked at reproducibility
> in a while, and my work was all on x86. This could be a regression or
> a longstanding issue with arm64.
> 
> If you install the diffoscope package (py37-diffoscope) and run it on
> the two directories / files it should give a more convenient view of
> the differences. (Or, if you can make a tarball of the differing files
> I can take a look.)

I no longer have the same content in those directory
trees: newer rebuild and the same buildworld used to
installworld to both places, instead of 2 different
buildworld's. I'm also unsure how reproducible getting
differences was.

I can eventually do experiments to test multiple separate
buildworld's and installworld's, but the machine is busy
building ports and the llvm builds involved means it
will be some time before I'd switch activities. And the
buildworld's involve llvm builds as well and take notable
time themselves. So my next comparison will not be any
time soon.

I'll let you know if I manage to generate another example,
this time being sure to keep the data. If I try multiple
times without finding any differences, I'll eventually
decide "enough is enough" and let you know.

===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)

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Re: FYI: WITH_REPRODUCIBLE_BUILD= problem for some files?

2021-05-03 Thread Ed Maste
On Thu, 29 Apr 2021 at 02:50, Mark Millard via freebsd-current
 wrote:
>
> Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/sbin/ping and 
> /usr/obj/DESTDIRs/13_0R-CA7-poud/sbin/ping differ
> Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/sbin/ping6 and 
> /usr/obj/DESTDIRs/13_0R-CA7-poud/sbin/ping6 differ
> Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/bin/ntpq and 
> /usr/obj/DESTDIRs/13_0R-CA7-poud/usr/bin/ntpq differ...

This is unexpected. Unfortunately I haven't looked at reproducibility
in a while, and my work was all on x86. This could be a regression or
a longstanding issue with arm64.

If you install the diffoscope package (py37-diffoscope) and run it on
the two directories / files it should give a more convenient view of
the differences. (Or, if you can make a tarball of the differing files
I can take a look.)
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FYI: WITH_REPRODUCIBLE_BUILD= problem for some files?

2021-04-28 Thread Mark Millard via freebsd-current
I did 2 test buildworld's based on:

# ~/fbsd-based-on-what-freebsd.sh 
branch: releng/13.0
merge-base: ea31abc261ffc01b6ff5671bffb15cf910a07f4b
merge-base: CommitDate: 2021-04-09 00:14:30 +
ea31abc261ff (HEAD -> releng/13.0, tag: release/13.0.0, freebsd/releng/13.0) 
13.0: update to RELEASE
n244733 (--first-parent --count for merge-base)

and produced separate build trees. I also installed the
world build into two separate directory trees:

/usr/obj/DESTDIRs/13_0R-CA7-chroot/
vs.
/usr/obj/DESTDIRs/13_0R-CA7-poud/

This was for other reasons. But eventually I happened
to do a diff -rq of the two trees and ended up with
the output showing some differing files:

Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/sbin/ping and 
/usr/obj/DESTDIRs/13_0R-CA7-poud/sbin/ping differ
Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/sbin/ping6 and 
/usr/obj/DESTDIRs/13_0R-CA7-poud/sbin/ping6 differ
Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/bin/ntpq and 
/usr/obj/DESTDIRs/13_0R-CA7-poud/usr/bin/ntpq differ
Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/lib/debug/sbin/ping.debug and 
/usr/obj/DESTDIRs/13_0R-CA7-poud/usr/lib/debug/sbin/ping.debug differ
Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/lib/debug/usr/sbin/ntpd.debug and 
/usr/obj/DESTDIRs/13_0R-CA7-poud/usr/lib/debug/usr/sbin/ntpd.debug differ
Files 
/usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/lib/debug/usr/tests/sbin/ping/in_cksum_test.debug
 and 
/usr/obj/DESTDIRs/13_0R-CA7-poud/usr/lib/debug/usr/tests/sbin/ping/in_cksum_test.debug
 differ
Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/sbin/ntp-keygen and 
/usr/obj/DESTDIRs/13_0R-CA7-poud/usr/sbin/ntp-keygen differ
Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/sbin/ntpd and 
/usr/obj/DESTDIRs/13_0R-CA7-poud/usr/sbin/ntpd differ
Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/sbin/ntpdate and 
/usr/obj/DESTDIRs/13_0R-CA7-poud/usr/sbin/ntpdate differ
Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/sbin/ntpdc and 
/usr/obj/DESTDIRs/13_0R-CA7-poud/usr/sbin/ntpdc differ
Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/sbin/sntp and 
/usr/obj/DESTDIRs/13_0R-CA7-poud/usr/sbin/sntp differ
Files /usr/obj/DESTDIRs/13_0R-CA7-chroot/usr/tests/sbin/ping/in_cksum_test and 
/usr/obj/DESTDIRs/13_0R-CA7-poud/usr/tests/sbin/ping/in_cksum_test differ

(That is all.)

For as much as I've looked at (not much), it looks to be
variations in byte-padding values.

The builds both were set up to tune for cortex-a7 explicitly.
I patch top's source code. I patch the OOM kill code to report
the specific reason for a kill. I still have some bcm2838
pci/xhci patching in place from an old investigation, but
that would be kernel code. None of the patching is specific
to the above list of files.

The hosting context was:

# uname -apKU
FreeBSD CA72_4c8G_ZFS 13.0-RELEASE FreeBSD 13.0-RELEASE #1 
releng/13.0-n244733-ea31abc261ff-dirty: Wed Apr 28 05:45:27 PDT 2021 
root@CA72_4c8G_ZFS:/usr/obj/BUILDs/13_0R-CA72-nodbg-clang/usr/src/arm64.aarch64/sys/GENERIC-NODBG-CA72
  arm64 aarch64 1300139 1300139

based on building the same source code (tuning for
cortex-a72).

It was the same media for all the activity. Unlike
the past many years for me, the context is using ZFS
instead of UFS, not that I think that makes a
difference here.

The differences do not mess up my activity but others
might notice and care about such differences.

===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)

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