GNU bug report logs - #30785
Man pages truncated, repeated

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From: Pierre Neidhardt <mail <at> ambrevar.xyz>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: Gábor Boskovits <boskovits <at> gmail.com>, 30785 <at> debbugs.gnu.org
Subject: bug#30785: Man pages truncated, repeated
Date: Mon, 14 Jan 2019 17:24:55 +0100

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ludo <at> gnu.org (Ludovic Courtès) writes:
> Maybe it’s just that the inferior is still running, no?

Well, it should finish in a fraction of a second.

sudo sh -c "echo '/tmp/core_%e.%p' >  /proc/sys/kernel/core_pattern"

>   ulimit -c unlimited
>   man whatever that causes the crash
>   gdb /path/to/preconv core

Smart!

This gave me no coredump at first because the pipeline "cd" into the
store/profile, which is readonly.  So I did

--8<---------------cut here---------------start------------->8---
sudo sh -c "echo '/tmp/core_%e.%p' > /proc/sys/kernel/core_pattern"
--8<---------------cut here---------------end--------------->8---

and then the segfault would generate a core.  From which GDB gives me:

--8<---------------cut here---------------start------------->8---
Core was generated by `preconv -e UTF-8'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  __stpcpy_sse2_unaligned () at ../sysdeps/x86_64/multiarch/strcpy-sse2-unaligned.S:298
298     ../sysdeps/x86_64/multiarch/strcpy-sse2-unaligned.S: No such file or directory.
(gdb) bt
#0  __stpcpy_sse2_unaligned () at ../sysdeps/x86_64/multiarch/strcpy-sse2-unaligned.S:298
#1  0x00000000004062c3 in relocatep ()
#2  0x0000000000405b5d in locale_charset ()
#3  0x0000000000402445 in main ()
(gdb) 
--8<---------------cut here---------------end--------------->8---

I haven't looked at the code yet, but here is my clue: argv[0], the program
name, is too long and overflows some string.

-- 
Pierre Neidhardt
https://ambrevar.xyz/

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