From: Markus Wichmann <nullplan@gmx.net>
To: musl@lists.openwall.com
Subject: Re: aio_cancel segmentation fault for in progress write requests
Date: Fri, 7 Dec 2018 21:35:32 +0100 [thread overview]
Message-ID: <20181207203532.GA2554@voyager> (raw)
In-Reply-To: <03a5f237-87cd-5580-4148-a29fa22d3ef0@adelielinux.org>
On Fri, Dec 07, 2018 at 01:13:44PM -0600, A. Wilcox wrote:
> So, my best theory is that running inside a debugger (gdb, valgrind)
> makes it slow enough that it no longer races.
Two ideas to investigate further. 1: Produce a coredump ("ulimit -c
unlimited"). That won't interfere with timing, but I have no clue if
coredumps work with multithreading.
2: Might I suggest installing a SIGSEGV handler? If you have libunwind,
you can create a backtrace from inside the handler. And even if not, you
can at least print the exception PC, which would help a ton already.
Only, don't return from that handler. Either _exit(), or better yet,
restore the default handler, then kill yourself with SIGSEGV.
Ciao,
Markus
next prev parent reply other threads:[~2018-12-07 20:35 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-07 12:52 Arkadiusz Sienkiewicz
2018-12-07 15:44 ` Rich Felker
2018-12-07 16:04 ` Arkadiusz Sienkiewicz
2018-12-07 16:52 ` Orivej Desh
2018-12-07 16:52 ` Rich Felker
2018-12-07 17:31 ` A. Wilcox
2018-12-07 18:26 ` Rich Felker
2018-12-07 19:05 ` A. Wilcox
2018-12-07 20:07 ` Rich Felker
2018-12-07 19:13 ` A. Wilcox
2018-12-07 20:21 ` Rich Felker
2018-12-07 20:35 ` Markus Wichmann [this message]
2018-12-07 21:12 ` Rich Felker
2018-12-07 22:51 ` A. Wilcox
2018-12-07 23:50 ` Rich Felker
2018-12-07 20:06 ` Florian Weimer
2018-12-07 20:14 ` Rich Felker
2018-12-08 16:18 ` Florian Weimer
2018-12-10 9:05 ` Arkadiusz Sienkiewicz
2018-12-12 0:36 ` Rich Felker
2018-12-17 14:21 ` Arkadiusz Sienkiewicz
2018-12-17 17:29 ` Rich Felker
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