On Wed, 2022-06-01 at 06:21 -1000, Steve Sakoman wrote:
> On Wed, Jun 1, 2022 at 6:10 AM Richard Purdie
> <[email protected]> wrote:
> >
> > On Wed, 2022-06-01 at 05:29 -1000, Steve Sakoman wrote:
> >
> >
> > Keep in mind that the test uses sstate to compare against so even that
> > isn't a guarantee of identifying the issue.
> >
> > Did you try the strings comparison I suggested? Do you have the file
> > section tables comparison (diff) I could look at?
>
> Are you referring to the section header info from objdump -h ?
>
> If so I've attached the a/b info, they are quite compact.
Yes, I couldn't remember the option to objdump offhand. The diff looks
like:
--- /tmp/headersa.txt 2022-06-01 17:22:57.272277627 +0100
+++ /tmp/headersb.txt 2022-06-01 17:22:43.972218408 +0100
@@ -1,5 +1,5 @@
-a/usr/lib/libwebkit2gtk-4.0.so.37.56.5: file format elf64-x86-64
+b/usr/lib/libwebkit2gtk-4.0.so.37.56.5: file format elf64-x86-64
Sections:
Idx Name Size VMA LMA File off Algn
@@ -63,15 +63,15 @@
CONTENTS, READONLY, DEBUGGING, OCTETS
29 .debug_abbrev 00c6ce64 0000000000000000 0000000000000000 921c9968 2**0
CONTENTS, READONLY, DEBUGGING, OCTETS
- 30 .debug_line 09025ee1 0000000000000000 0000000000000000 92e367cc 2**0
+ 30 .debug_line 09025ede 0000000000000000 0000000000000000 92e367cc 2**0
CONTENTS, READONLY, DEBUGGING, OCTETS
- 31 .debug_str 1820ba50 0000000000000000 0000000000000000 9be5c6ad 2**0
+ 31 .debug_str 1820ba50 0000000000000000 0000000000000000 9be5c6aa 2**0
CONTENTS, READONLY, DEBUGGING, OCTETS
- 32 .debug_line_str 0005d9f4 0000000000000000 0000000000000000 b40680fd
2**0
+ 32 .debug_line_str 0005d9f4 0000000000000000 0000000000000000 b40680fa
2**0
CONTENTS, READONLY, DEBUGGING, OCTETS
- 33 .debug_loclists 13d74aa2 0000000000000000 0000000000000000 b40c5af1
2**0
+ 33 .debug_loclists 13d74aa0 0000000000000000 0000000000000000 b40c5aee
2**0
CONTENTS, READONLY, DEBUGGING, OCTETS
- 34 .debug_rnglists 034c6c08 0000000000000000 0000000000000000 c7e3a593
2**0
+ 34 .debug_rnglists 034c6bf6 0000000000000000 0000000000000000 c7e3a58e
2**0
CONTENTS, READONLY, DEBUGGING, OCTETS
- 35 .gnu_debuglink 00000024 0000000000000000 0000000000000000 cb30119c 2**2
+ 35 .gnu_debuglink 00000024 0000000000000000 0000000000000000 cb301184 2**2
CONTENTS, READONLY
I'm a bit puzzled since usually the debug symbols are moved off to the
-dbg package and yet they seem combined here with the library. What the
above seems to say is that the debug_line, loclists and rnglists
sections changed size, the rest changed offset (and we ignore
gnu_debuglink since that is a checksum which would depend on the other
bits).
That would imply that some piece of code used to compile webkit has
different line numbering on one system compared to another but
generates identical code. You should be able to parse the debuginfo to
get a filename and linenumber out of it but I can't remember how, I
think I learnt to read dwarfish last time I did this :/.
Cheers,
Richard
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