[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2018-11-21 Thread Bug Watch Updater 
Launchpad has imported 18 comments from the remote bug at
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79041.

If you reply to an imported comment from within Launchpad, your comment
will be sent to the remote bug automatically. Read more about
Launchpad's inter-bugtracker facilities at
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On 2017-01-10T11:17:05+00:00 Robert Schiele wrote:

Created attachment 40487
test case to reproduce the problem

To support older Cortex A53 CPUs that suffer from erratum 843419 the
Linux kernel has some option not to allow certain relocations in kernel
modules. To achieve that it utilizes the options -mcmodel=large -mpc-
relative-literal-loads.

Unfortunately we found a case where gcc does still produce such
relocations despite the options being used if optimization level is at
least -O2.

The code in question is attached and the problem can be reproduced like
this:

$ aarch64-linux-gnu-gcc -O2 -mcmodel=large -mpc-relative-literal-loads -c t.c
$ aarch64-linux-gnu-objdump -r t.o

t.o: file format elf64-littleaarch64

RELOCATION RECORDS FOR [.text]:
OFFSET   TYPE  VALUE
0018 R_AARCH64_CALL26  strcmp
0030 R_AARCH64_ADR_PREL_PG_HI21  .text+0x0060
0034 R_AARCH64_ADD_ABS_LO12_NC  .text+0x0060
0050 R_AARCH64_ABS64   .rodata.str1.8


Obviously the attached code by itself might not be very useful but it is a 
stripped-down code example of a real-world kernel driver just to demonstrate 
the problem.

Some observations:
1. The problem did reproduce with the latest patches from Linaro and with the 
upstream version (without the Linaro patches) of latest gcc 6 branch.
2. The problem did also reproduce with the gcc 5 branch including the Linaro 
patches on that branch. I did not check the gcc 5 branch without the Linaro 
patches.
3. The problem disappears if the useless (not used in the code) second entry in 
the array gets removed from the code.
4. The problem seems to be in the code that is generated for the strcpy by the 
compiler.
5. The problem disappears if the string is made longer. In that case the string 
ends up in .rodata.str1.8 section like the other string, while in the 
problematic case it is stored as .xword type in .text section.

So my personal conclusion is that some code in the backend involved in
this strcpy optimization does not honor the -mpc-relative-literal-loads
option properly.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695093/comments/0


On 2017-01-10T11:36:04+00:00 Ktkachov wrote:

Confirmed on GCC 6.3.1
This doesn't appear on trunk. Trunk generates a pc-relative load.

aarch64-none-elf-objdump -r t.o

reloc.o: file format elf64-littleaarch64

RELOCATION RECORDS FOR [.text]:
OFFSET   TYPE  VALUE 
0018 R_AARCH64_CALL26  strcmp
0038 R_AARCH64_ABS64   .rodata.str1.8
0040 R_AARCH64_ABS64   .rodata.str1.8+0x0008

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695093/comments/1


On 2017-01-10T16:22:55+00:00 Ktkachov wrote:

This was fixed by a trunk patch that has been only partially backported to GCC 
6.
Testing a patch to fix it.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695093/comments/2


On 2017-01-11T06:25:55+00:00 Robert Schiele wrote:

If you point me to the specific patch that you have in mind I can in
parallel already test whether besides the test case I provided it also
fixes the original problem this was detected with.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695093/comments/3


On 2017-01-11T16:34:07+00:00 Ktkachov wrote:

(In reply to Robert Schiele from comment #3)
> If you point me to the specific patch that you have in mind I can in
> parallel already test whether besides the test case I provided it also fixes
> the original problem this was detected with.

I've posted a patch for review at:
https://gcc.gnu.org/ml/gcc-patches/2017-01/msg00736.html
It should apply to a GCC 6-based tree (but not GCC 7 trunk which doesn't 
exhibit this bug)

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695093/comments/4


On 2017-01-12T07:39:19+00:00 Robert Schiele wrote:

Thanks! I can confirm that this also fixes the original problem for all
cases we observed so far.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695093/comments/5


On 2017-01-12T17:42:22+00:00 Ktkachov wrote:

thanks

[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2018-05-09 Thread dann frazier 
** Changed in: linux (Ubuntu Zesty)
   Status: Fix Committed => Won't Fix

** Changed in: linux (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

** Changed in: linux (Ubuntu)
   Status: Triaged => Fix Released

** Changed in: gcc-6 (Ubuntu Zesty)
   Status: Triaged => Won't Fix

** Changed in: gcc-5 (Ubuntu Zesty)
   Status: Triaged => Won't Fix

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-11-14 Thread dann frazier 
I've verified that this is resolved in both linux_4.4.0-101.124 and
linux-hwe_4.10.0-40.44~16.04.1.

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-10-16 Thread dann frazier 
** Changed in: linux (Ubuntu Xenial)
   Status: Triaged => Fix Committed

** Changed in: linux (Ubuntu Zesty)
   Status: Triaged => Fix Committed

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-10-04 Thread Launchpad Bug Tracker 
This bug was fixed in the package gcc-5 - 5.4.0-6ubuntu1~16.04.5

---
gcc-5 (5.4.0-6ubuntu1~16.04.5) xenial-proposed; urgency=medium

  * SRU
  * Fix PR target/77267 (x86), taken from the trunk. LP: #1623418.
  * Fix hangs w/ asan binaries on arm64 (Dann Frazier). LP: #1709727.
  * Linaro branch only: Fix PR target/79041, aarch64 backend emitting
R_AARCH64_ADR_PREL_PG_HI21 relocation despite -mpc-relative-literal-loads
option being used (Dan Frazier). LP: #1695093.

 -- Matthias Klose   Wed, 23 Aug 2017 11:35:00 +0200

** Changed in: gcc-5 (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

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  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-09-14 Thread dann frazier 
gcc-5/xenial verified:

ubuntu@neander:~$ cat /proc/version
Linux version 4.4.0-96-generic (buildd@bos01-arm64-013) (gcc version 5.4.0 
20160609 (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.4) ) #119-Ubuntu SMP Tue Sep 12 
15:00:28 UTC 2017
ubuntu@neander:~$ sudo dmesg -c > /dev/null
ubuntu@neander:~$ sudo modprobe scsi_debug
modprobe: ERROR: could not insert 'scsi_debug': Exec format error
ubuntu@neander:~$ dmesg
[   65.658638] module scsi_debug: unsupported RELA relocation: 275
ubuntu@neander:~$ sudo dpkg -i 
linux-image-4.4.0-96-generic_4.4.0-96.119+gccsru.1_arm64.deb && sudo reboot
(Reading database ... 112555 files and directories currently installed.)
Preparing to unpack 
linux-image-4.4.0-96-generic_4.4.0-96.119+gccsru.1_arm64.deb ...
Done.
Unpacking linux-image-4.4.0-96-generic (4.4.0-96.119+gccsru.1) over 
(4.4.0-96.119) ...
Examining /etc/kernel/postrm.d .
run-parts: executing /etc/kernel/postrm.d/initramfs-tools 4.4.0-96-generic 
/boot/vmlinuz-4.4.0-96-generic
run-parts: executing /etc/kernel/postrm.d/zz-flash-kernel 4.4.0-96-generic 
/boot/vmlinuz-4.4.0-96-generic
run-parts: executing /etc/kernel/postrm.d/zz-update-grub 4.4.0-96-generic 
/boot/vmlinuz-4.4.0-96-generic
Setting up linux-image-4.4.0-96-generic (4.4.0-96.119+gccsru.1) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Not updating initrd symbolic links since we are being updated/reinstalled 
(4.4.0-96.119 was configured last, according to dpkg)
Not updating image symbolic links since we are being updated/reinstalled 
(4.4.0-96.119 was configured last, according to dpkg)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-96-generic 
/boot/vmlinuz-4.4.0-96-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-96-generic 
/boot/vmlinuz-4.4.0-96-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-96-generic
W: Possible missing firmware /lib/firmware/ast_dp501_fw.bin for module ast
W: mdadm: /etc/mdadm/mdadm.conf defines no arrays.
flash-kernel: deferring update (trigger activated)
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 
4.4.0-96-generic /boot/vmlinuz-4.4.0-96-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-96-generic 
/boot/vmlinuz-4.4.0-96-generic
run-parts: executing /etc/kernel/postinst.d/zz-flash-kernel 4.4.0-96-generic 
/boot/vmlinuz-4.4.0-96-generic
flash-kernel: deferring update (trigger activated)
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-96-generic 
/boot/vmlinuz-4.4.0-96-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is 
set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-96-generic
Found initrd image: /boot/initrd.img-4.4.0-96-generic
Found linux image: /boot/vmlinuz-4.4.0-93-generic
Found initrd image: /boot/initrd.img-4.4.0-93-generic
Adding boot menu entry for EFI firmware configuration
done
Processing triggers for flash-kernel (3.0~rc.4ubuntu62.2) ...
Unsupported platform on EFI system, doing nothing.
Shared connection to 10.229.65.157 closed.

@@@ REBOOT @@@

ubuntu@neander:~$ cat /proc/version
Linux version 4.4.0-96-generic (root@neander) (gcc version 5.4.0 20160609 
(Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.5) ) #119+gccsru.1 SMP Thu Sep 14 21:43:33 
UTC 2017
ubuntu@neander:~$ sudo modprobe scsi_debug
ubuntu@neander:~$ sudo modprobe -r scsi_debug
ubuntu@neander:~$ sudo dmesg -c > /dev/null
(failed reverse-i-search)`modpor': sudo ^Cdprobe -r scsi_debug
ubuntu@neander:~$ sudo modprobe scsi_debug
ubuntu@neander:~$ dmesg
[   71.235619] scsi_debug:sdebug_driver_probe: host protection
[   71.235628] scsi host5: scsi_debug, version 1.85 [20141022], dev_size_mb=8, 
opts=0x0
[   71.236469] scsi 5:0:0:0: Direct-Access Linuxscsi_debug   0184 
PQ: 0 ANSI: 6
[   71.237326] sd 5:0:0:0: Attached scsi generic sg3 type 0
[   71.243989] sd 5:0:0:0: [sdd] 16384 512-byte logical blocks: (8.39 MB/8.00 
MiB)
[   71.248044] sd 5:0:0:0: [sdd] Write Protect is off
[   71.248051] sd 5:0:0:0: [sdd] Mode Sense: 73 00 10 08
[   71.255975] sd 5:0:0:0: [sdd] Write cache: enabled, read cache: enabled, 
supports DPO and FUA
[   71.343980] sd 5:0:0:0: [sdd] Attached SCSI disk
ubuntu@neander:~$

** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-09-13 Thread Brian Murray 
Hello dann, or anyone else affected,

Accepted gcc-5 into xenial-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/gcc-5/5.4.0-6ubuntu1~16.04.5 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. In either case, details of your
testing will help us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: gcc-5 (Ubuntu Xenial)
   Status: Triaged => Fix Committed

** Tags added: verification-needed verification-needed-xenial

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-09-13 Thread dann frazier 
** Description changed:

+ [Impact]
+ Certain kernel modules are unloadable (libceph & scsi_debug) due to the 
compiler generating unsupported relocations.
+ 
+ This symptom is similar to LP: #1533009 but, in that case it impacted
+ all modules, and the fix for that appears to remain in place.
+ 
+ [Test Case]
+ 
  With the hwe-z kernel:
  
  ubuntu@grotian:~$ sudo modprobe libceph
  modprobe: ERROR: could not insert 'libceph': Exec format error
  ubuntu@grotian:~$ dmesg
  [66988.470307] module libceph: unsupported RELA relocation: 275
  
- This symptom is similar to LP: #1533009 but, in that case it impacted
- all modules, and the fix for that appears to remain in place.
+ [Regression Risk]
+ The scope of the fix is restricted to aarch64, so regressions should only 
impact the arm64 port of Ubuntu. Regressions could impact when literal loads 
are used - which may have performance impacts or possibly cause software to 
fail to build/run where it previously did. This is somewhat mitigated by the 
fact that this has been fixed in artful gcc-5/gcc-6 and used on our buildds for 
some time. Only "somewhat", because gcc-7 is now the default.

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-08-21 Thread Launchpad Bug Tracker 
This bug was fixed in the package gcc-5 - 5.4.1-12ubuntu2

---
gcc-5 (5.4.1-12ubuntu2) artful; urgency=medium

  * Merge with Debian; remaining changes:
- Build from upstream sources.

gcc-5 (5.4.1-12) unstable; urgency=medium

  * Update to SVN 20170820 (r251205, 5.4.1) from the gcc-5-branch.
- Fix PR libgomp/80394, PR sanitizer/77396, PR sanitizer/80166,
  PR c++/78761, PR gcov-profile/78783, PR c++/79641, PR c/80097,
  PR c++/79512, PR c/77767, PR c/67410, PR c/72816, PR libgomp/80394,
  PR rtl-optimization/80385, PR target/80286 (x86), PR debug/80025,
  PR sanitizer/80168, PR rtl-optimization/80112, PR c++/80129,
  PR sanitizer/79944, PR target/79932 (x86), PR target/79932 (x86),
  PR rtl-optimization/79901, PR rtl-optimization/79901, PR target/79807,
  PR target/79729 (x86), PR middle-end/79396, PR target/79570,
  PR target/79494 (x86), PR target/79568 (x86), PR target/79559 (x86),
  PR tree-optimization/79411, PR middle-end/79399, PR target/79197 (PPC),
  PR ipa/77905, PR target/78796 (AArch64), PR fortran/78298,
  PR middle-end/69183, PR middle-end/78416, PR middle-end/67335,
  PR rtl-optimization/78378, PR target/78227 (x86), PR sanitizer/66343,
  PR rtl-optimization/77919, PR fortran/77665, PR middle-end/77624,
  PR target/77587, PR middle-end/77594, PR sanitizer/68260,
  PR fortran/77516, PR debug/77363, PR middle-end/77377, PR target/71910,
  PR tree-optimization/72824, PR tree-optimization/72824,
  PR sanitizer/71953, PR middle-end/79931, PR ipa/65972, PR lto/50345,
  PR gcov-profile/78783, PR gcov-profile/80413, PR ipa/80212,
  PR sanitizer/70878, PR gcov-profile/80224, PR ipa/80205, PR ipa/80104,
  PR c++/80363, PR c++/80176, PR c++/80141, PR c++/79896, PR c++/79664,
  PR c++/79512, PR c++/78341, PR c++/78949, PR c++/78649, PR c++/77739,
  PR c++/77285, PR c++/78089, PR c++/77467, PR c++/77722, PR c++/77637,
  PR c++/77375, PR c++/72868, PR fortran/78866, PR fortran/77666,
  PR fortran/77500, PR middle-end/50199, PR sanitizer/78992,
  PR sanitizer/78532, PR libstdc++/81002, PR c/81006, PR target/81894 (x86),
  PR target/81861 (x86), PR tree-optimization/81354, PR sanitizer/81604,
  PR tree-optimization/81555, PR tree-optimization/81556,
  PR tree-optimization/81162, PR target/80569 (x86), PR target/81471 (x86),
  PR target/81375 (x86), PR target/81300 (x86), PR tree-optimization/81192,
  PR target/80382 (PPC), PR target/80966 (PPC), PR rtl-optimization/73650,
  PR target/61729 (PPC), PR target/77850 (PPC), PR target/80382 (PPC),
  PR middle-end/80692, PR target/80966 (PPC), PR middle-end/80902,
  PR target/79155 (x86), PR other/80909, PR ipa/80663, PR ipa/79850,
  PR driver/31468, PR other/80589, PR gcov-profile/53915, PR driver/56469,
  PR target/80968 (SPARC), PR target/80968 (SPARC), PR c/81006,
  PR fortran/70601.
- Fix PR sanitizer/66343. LP: #1704401.
  * Don't build the gc enabled libobjc for cross compilers. Closes: #872233.
  * Fix hangs w/ asan binaries on arm64 (Dann Frazier). LP: #1709727.
  * Linaro branch only: Fix PR target/79041, aarch64 backend emitting
R_AARCH64_ADR_PREL_PG_HI21 relocation despite -mpc-relative-literal-loads
option being used (Dan Frazier). LP: #1695093.

 -- Matthias Klose   Sun, 20 Aug 2017 16:34:04 +0200

** Changed in: gcc-5 (Ubuntu)
   Status: Triaged => Fix Released

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-08-20 Thread Matthias Klose 
fixed in gcc-6 6.3.0-21ubuntu1 in artful


** Changed in: gcc-6 (Ubuntu)
   Status: Triaged => Fix Released

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-08-10 Thread dann frazier 
The timeout issue described in comment #8 is being tracked in LP:
#1709727.

** Changed in: gcc-5 (Ubuntu)
   Status: New => Triaged

** Changed in: gcc-5 (Ubuntu Xenial)
   Status: Confirmed => Triaged

** Changed in: gcc-5 (Ubuntu Yakkety)
   Status: New => Won't Fix

** Changed in: gcc-5 (Ubuntu Zesty)
   Status: New => Triaged

** Changed in: linux (Ubuntu Zesty)
   Status: Confirmed => Triaged

** Changed in: gcc-6 (Ubuntu Yakkety)
   Status: Confirmed => Won't Fix

** Changed in: gcc-6 (Ubuntu Zesty)
   Status: Confirmed => Triaged

** Changed in: gcc-6 (Ubuntu)
   Status: Confirmed => Triaged

** Changed in: linux (Ubuntu)
   Status: Confirmed => Triaged

** Changed in: linux (Ubuntu Xenial)
   Status: Confirmed => Triaged

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-07-17 Thread dann frazier 
I uploaded a package w/ the patch from Comment #7 to ppa:dannf/test. Note that 
the tests took a *very* long time on arm64, with lots of timeouts:
  https://launchpad.net/~dannf/+archive/ubuntu/test/+build/13073558
This was not a problem for other architectures.

I did a local arm64 build of the *current* gcc-5 in xenial-updates, and 
observed the same symptoms - so I don't think this is a regression in my 
proposed fix. That said, this wasn't a problem with the current xenial-updates 
build:
  
https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/security/+build/11132711

So it would appear that something has regressed for xenial since that
upload.

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  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-07-11 Thread Ubuntu Foundations Team Bug Bot 
** Tags added: patch

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-07-11 Thread dann frazier 
Here's a backport of the gcc-6 fix to gcc-5. It includes a backport of
the -mpc-relative-literal-loads option rename change, since it was a
dependent patch, and I'm not comfortable enough w/ gcc development to do
the backport w/o it.

** Patch added: "gcc-5-backport.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695093/+attachment/4912990/+files/gcc-5-backport.debdiff

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-06-28 Thread dann frazier 
** Changed in: gcc-6 (Ubuntu Xenial)
   Status: Confirmed => Invalid

** Also affects: gcc-5 (Ubuntu)
   Importance: Undecided
   Status: New

** Changed in: gcc-5 (Ubuntu Xenial)
   Status: New => Confirmed

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-06-21 Thread Bug Watch Updater 
** Changed in: linux
   Status: Unknown => In Progress

** Changed in: linux
   Importance: Unknown => Medium

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-06-21 Thread Matthias Klose 
** Bug watch added: GCC Bugzilla #79041
   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79041

** Also affects: linux via
   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79041
   Importance: Unknown
   Status: Unknown

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-06-14 Thread dann frazier 
fyi, I verified that this is also reproducible with gcc-
linaro-6.3.1-2017.05

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-06-13 Thread dann frazier 
I attempted to port the above patch to our branch to test it, but it has
conflicts with the linaro snapshot patch we apply. It appears that the
conflicts are with a backport of r237607[*] applied to Linaro's gcc-6
branch. r237607 is also supposed to be the source of the patch in
Comment #4 - so perhaps that backport was incomplete?

[*]
https://git.linaro.org/toolchain/gcc.git/commit/?h=linaro/gcc-6-branch=2ace425fb0ae8502c240505448fc9befd618e279

** Changed in: gcc-6 (Ubuntu)
   Status: New => Confirmed

** Changed in: gcc-6 (Ubuntu Zesty)
   Status: New => Confirmed

** Changed in: gcc-6 (Ubuntu Yakkety)
   Status: New => Confirmed

** Changed in: gcc-6 (Ubuntu Xenial)
   Status: New => Confirmed

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-06-13 Thread dann frazier 
** Also affects: gcc-6 (Ubuntu)
   Importance: Undecided
   Status: New

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-06-13 Thread Steve Capper 
Hi,
I think the problem has already been solved here:
https://gcc.gnu.org/ml/gcc-patches/2017-01/msg00736.html

This fix appeared to do the trick for gcc-6_1_0-release on my machine, I
would suggest that you give it a go.

[ I verified the relocations via:
aarch64-linux-gnu-objdump -dr ./net/ceph/libceph.ko | less
Then searched for the R_AARCH64_ADR_PREL_PG_HI21 relocation. ]

Cheers,
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Steve

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-06-09 Thread dann frazier 
Attached is a buildlog of the kernel w/ V=1 set to see the full gcc commandline.
I confirmed that the symptoms are present w/ this build.

** Attachment added: "buildlog.xz"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695093/+attachment/4893293/+files/buildlog.xz

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

2017-06-07 Thread Ryan Beisner 
** Tags added: arm64 uosci

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Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

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