Bug#624465: Closing bug

[Vincent Lefevre]

Control: forwarded -1 https://sourceware.org/bugzilla/show_bug.cgi?id=33256

On 2025-08-04 23:01:43 -0400, Sergio Durigan Junior wrote:
> This doesn't seem to be a Debian-specific bug, so would you be willing
> to take it upstream and discuss with them?  I believe they might be at
> least interested in understanding what's going on here.  If I have the
> time during the coming weekend, I'll also take a look.

Reported at

  https://sourceware.org/bugzilla/show_bug.cgi?id=33256

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Bug#624465: Closing bug

[Sergio Durigan Junior]

On Monday, August 04 2025, Vincent Lefevre wrote:

> On 2025-08-04 13:41:13 -0400, Sergio Durigan Junior wrote:
>> I can't reproduce this on GDB 16.3:
> [...]
>
> This actually depends on how the program has been compiled.
> I've attached:
>   * tst.c: source.
>   * tst-8: produced by "gcc-8 -Wall -g tst.c -o tst-8".
>   * tst-9: produced by "gcc-9 -Wall -g tst.c -o tst-9".
>
> With tst-8:
>
> (gdb) bt
> #0  __pthread_kill_implementation (threadid=, 
> signo=signo@entry=6, no_tid=no_tid@entry=0) at ./nptl/pthread_kill.c:44
> #1  0x77e3a9ff in __pthread_kill_internal (threadid=, 
> signo=6) at ./nptl/pthread_kill.c:89
> #2  0x77de5cc2 in __GI_raise (sig=sig@entry=6)
> at ../sysdeps/posix/raise.c:26
> #3  0x77dce4ac in __GI_abort () at ./stdlib/abort.c:73
> #4  0x5160 in fct (y=17, z=1) at tst.c:13
> #5  0x517e in main () at tst.c:21
>
> With tst-9:
>
> (gdb) bt
> #0  __pthread_kill_implementation (threadid=, 
> signo=signo@entry=6, no_tid=no_tid@entry=0) at ./nptl/pthread_kill.c:44
> #1  0x77e3a9ff in __pthread_kill_internal (threadid=, 
> signo=6) at ./nptl/pthread_kill.c:89
> #2  0x77de5cc2 in __GI_raise (sig=sig@entry=6)
> at ../sysdeps/posix/raise.c:26
> #3  0x77dce4ac in __GI_abort () at ./stdlib/abort.c:73
> #4  0x5165 in fct (x=0x7fffd77c, y=17, z=1) at tst.c:13
> #5  0x5183 in main () at tst.c:21
>
> "objdump -S" shows the correct prototype in both cases:
>
>   int fct (int *x, int y, int z)
>
> Though GCC 8 is old, generated code like tst-8 might still occur
> with other testcases or with future GCC versions.

Thanks for double-checking.

Well, TBH this may very well be a problem with the DWARF generated by
GCC 8 (which, as you said, is an old compiler).  If this is really the
case, then there's not much GDB can do.

This doesn't seem to be a Debian-specific bug, so would you be willing
to take it upstream and discuss with them?  I believe they might be at
least interested in understanding what's going on here.  If I have the
time during the coming weekend, I'll also take a look.

Thanks,

-- 
Sergio
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Please send encrypted e-mail if possible
https://sergiodj.net/


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