Re: general protection faults with "git grep" version 1.7.7.1

From: Bernt Hansen <bernt@norang.ca>
Date: Oct 25, 2011, 00:00 UTC
Message-ID: <878voaym7k.fsf@norang.ca>
In-Reply-To: <20111024225836.GA1678@x4.trippels.de>

Markus Trippelsdorf <markus@trippelsdorf.de> writes:

Show 22 quoted lines

> On 2011.10.24 at 22:49 +0100, Richard W.M. Jones wrote:
>> On Mon, Oct 24, 2011 at 10:11:53PM +0200, Markus Trippelsdorf wrote:
>> > Suddenly I'm getting strange protection faults when I run "git grep" on
>> > the gcc tree:
>> 
>> Jim Meyering and I are trying to chase what looks like a similar or
>> identical bug in git-grep.  We've not got much further than gdb and
>> valgrind so far, but see:
>> 
>> https://bugzilla.redhat.com/show_bug.cgi?id=747377
>> 
>> It's slightly suspicious that this bug only started to happen with the
>> latest glibc, but that could be coincidence, or could be just that
>> glibc exposes a latent bug in git-grep.
>
> Thanks for the pointer.
>
> Compiling git with -O1 "solves" the problem for me. 
> This issue is independent of the exact git version being used (I tried
> three different ones and always hit the problem).
> It happens always on the _second_ run of "git grep" on my machine. The
> first run always succeeds. So this might be a cache related issue.

Hi,

I updated from an old commit 2883969 (Sync with maint, 2011-10-15) to origin/master 10b2a48 (Merge branch 'maint', 2011-10-23) today and promptly got segfaults on git status in my org-mode repository.

Going back to the old commit makes it work again.

Git bisect identifies the following commit as the problem:

[2548183badb98d62079beea62f9d2e1f47e99902] fix phantom untracked files when core.ignorecase is set

I'm doing make && make install to my local home directory.

On the above commit I get this:

--8<---------------cut here---------------start------------->8--- bernt@gollum:~/git/org$ git status *** glibc detected *** git: free(): invalid next size (normal): 0x08ce1a88 *** ======= Backtrace: ========= /lib/i686/cmov/libc.so.6(+0x6b281)[0xb749d281] /lib/i686/cmov/libc.so.6(+0x6cad8)[0xb749ead8] /lib/i686/cmov/libc.so.6(cfree+0x6d)[0xb74a1bbd] /lib/i686/cmov/libc.so.6(+0x5c0a0)[0xb748e0a0] /lib/i686/cmov/libc.so.6(fopen64+0x2c)[0xb749067c] git[0x80ba49c] git[0x810d0ab] git[0x80627af] git[0x804b867] git[0x804ba73] /lib/i686/cmov/libc.so.6(__libc_start_main+0xe6)[0xb7448c76] git[0x804b141] ======= Memory map: ======== 08048000-0814f000 r-xp 00000000 08:01 6555228 /home/bernt/git/bin/git 0814f000-08154000 rw-p 00106000 08:01 6555228 /home/bernt/git/bin/git 08154000-0819c000 rw-p 00000000 00:00 0 08cd7000-08cf8000 rw-p 00000000 00:00 0 [heap] b7300000-b7321000 rw-p 00000000 00:00 0 b7321000-b7400000 ---p 00000000 00:00 0 b740f000-b742c000 r-xp 00000000 08:01 4603917 /lib/libgcc_s.so.1 b742c000-b742d000 rw-p 0001c000 08:01 4603917 /lib/libgcc_s.so.1 b742d000-b742e000 rw-p 00000000 00:00 0 b742e000-b7430000 r-xp 00000000 08:01 4620339 /lib/i686/cmov/libdl-2.11.2.so b7430000-b7431000 r--p 00001000 08:01 4620339 /lib/i686/cmov/libdl-2.11.2.so b7431000-b7432000 rw-p 00002000 08:01 4620339 /lib/i686/cmov/libdl-2.11.2.so b7432000-b7572000 r-xp 00000000 08:01 4622760 /lib/i686/cmov/libc-2.11.2.so b7572000-b7574000 r--p 0013f000 08:01 4622760 /lib/i686/cmov/libc-2.11.2.so b7574000-b7575000 rw-p 00141000 08:01 4622760 /lib/i686/cmov/libc-2.11.2.so b7575000-b7578000 rw-p 00000000 00:00 0 b7578000-b758d000 r-xp 00000000 08:01 4620333 /lib/i686/cmov/libpthread-2.11.2.so b758d000-b758e000 r--p 00014000 08:01 4620333 /lib/i686/cmov/libpthread-2.11.2.so b758e000-b758f000 rw-p 00015000 08:01 4620333 /lib/i686/cmov/libpthread-2.11.2.so b758f000-b7592000 rw-p 00000000 00:00 0 b7592000-b76cf000 r-xp 00000000 08:01 794957 /usr/lib/i686/cmov/libcrypto.so.0.9.8 b76cf000-b76e7000 rw-p 0013c000 08:01 794957 /usr/lib/i686/cmov/libcrypto.so.0.9.8 b76e7000-b76ea000 rw-p 00000000 00:00 0 b76ea000-b76fd000 r-xp 00000000 08:01 286811 /usr/lib/libz.so.1.2.3.4 b76fd000-b76fe000 rw-p 00013000 08:01 286811 /usr/lib/libz.so.1.2.3.4 b771b000-b771d000 rw-p 00000000 00:00 0 b771d000-b771e000 r-xp 00000000 00:00 0 [vdso] b771e000-b7739000 r-xp 00000000 08:01 4604271 /lib/ld-2.11.2.so b7739000-b773a000 r--p 0001a000 08:01 4604271 /lib/ld-2.11.2.so b773a000-b773b000 rw-p 0001b000 08:01 4604271 /lib/ld-2.11.2.so bfa3d000-bfa52000 rw-p 00000000 00:00 0 [stack] Aborted (core dumped) --8<---------------cut here---------------end--------------->8---

Let me know if I can provide any more information.

Regards Bernt