From: Derrick Stolee <derrickstolee@github.com>
To: Emily Noneman <emily.noneman@gmail.com>,
Jeff King <peff@peff.net>, Paul Horn <git@knutwalker.engineer>
Cc: git@vger.kernel.org
Subject: Re: Bugreport: pack-objects died of signal 11
Date: Thu, 4 Aug 2022 16:14:03 -0400 [thread overview]
Message-ID: <87d46db2-8e09-e5a7-b6bb-e94bf05df305@github.com> (raw)
In-Reply-To: <ecb6fa27-b918-4234-8e44-13c2a3e76e07@gmail.com>
On 8/4/2022 2:21 PM, Emily Noneman wrote:
> The stack trace:
> Thread 2 received signal SIGSEGV, Segmentation fault.
> git_config_check_init (repo=0x0) at config.c:2538
> 2538 if (repo->config && repo->config->hash_initialized)
> (gdb) bt
> #0 git_config_check_init (repo=0x0) at config.c:2538
> #1 0x00000001001197a8 in repo_config_get_string (repo=0x0, key=0x1002a3c49 "status.showuntrackedfiles", dest=0x0, dest@entry=0x7ff7bfefc1f0) at config.c:2574
> #2 0x000000010014a85b in new_untracked_cache_flags (istate=0x0) at dir.c:2781
> #3 new_untracked_cache (istate=0x0, flags=-1) at dir.c:2797
> #4 0x00000001001d68f1 in tweak_untracked_cache (istate=0x7ff7bfefc7e0) at read-cache.c:1996
Here is where things are confusing:
* tweak_untracked_cache() takes an 'istate' that is non-NULL here.
* The next spot in the stack is new_untracked_cache() with a NULL 'istate'.
The only way these are connected is by a missing stack frame (probably
optimized out) calling add_untracked_cache(). Still, it should be
passing 'istate' throughout this process.
The repo_config_get_string() call must also be coming from
new_untracked_cache_flags() which is again a missing stack frame,
but is called from new_untracked_cache(). Strangely, it's using
a NULL 'repo' here which should have come from 'istate->repo', so
we should have had a segfault earlier.
Sorry for the drive-by commentary without any solution. This is
just genuinely puzzling to me.
Thanks,
-Stolee
next prev parent reply other threads:[~2022-08-04 20:14 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-12 8:51 Bugreport: pack-objects died of signal 11 Paul Horn
2022-07-14 21:37 ` Jeff King
2022-08-04 18:21 ` Emily Noneman
2022-08-04 20:14 ` Derrick Stolee [this message]
2022-08-04 21:07 ` Ævar Arnfjörð Bjarmason
2022-08-04 22:32 ` Emily Noneman
2022-08-05 14:24 ` [PATCH] revision.c: set-up "index_state.repo", don't segfault in pack-objects Ævar Arnfjörð Bjarmason
2022-08-05 14:48 ` Derrick Stolee
2022-08-05 15:25 ` Jeff King
2022-08-05 16:41 ` Junio C Hamano
2022-08-08 18:15 ` Emily Noneman
2022-08-09 12:55 ` Jeff King
2022-08-09 16:56 ` Junio C Hamano
2022-08-09 12:54 ` Jeff King
2022-08-09 16:55 ` Junio C Hamano
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