linux-kernel - Re: 2.6.19-rc6-mm2 hangs when gdb is run on a multithread program

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <457CB4A6.5090807@gmail.com>
Date:	Sun, 10 Dec 2006 17:30:14 -0800
From:	walt <w41ter@...il.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	Andi Kleen <ak@....de>
Subject: Re: 2.6.19-rc6-mm2 hangs when gdb is run on a multithread program

Jeremy Fitzhardinge wrote:
> Pedro Larroy Tovar wrote:
>> Hi
>>
>> I can reproduce a crash with 2.6.19-rc6-mm2 triggered when debugging a
>> program with gdb that uses pthreads. No oops or anything strange seems
>> to be printed by the kernel, but the box appears to stop doing disk IO.

> Hm, I wonder if this is related walt's problem running things under gdb?

Jeremy, I redid my git-bisect from scratch and came up with a different
commit for the gdb breakage:

commit f95d47caae5302a63d92be9a0292abc90e2a14e1
Author: Jeremy Fitzhardinge <jeremy@...p.org>
Date:   Thu Dec 7 02:14:02 2006 +0100
[PATCH] i386: Use %gs as the PDA base-segment in the kernel

This commit is the one which causes gdb to halt with this error
no matter what executable I try to run:
Warning:
Cannot insert breakpoint -2.
Error accessing memory address 0xd74b: Input/output error.

I tried to git-revert just this one commit, but I get merge conflicts
I don't how to resolve.

BTW, I just discovered tons of kernel debugging config options which
were turned off -- I just turned several of them on.  Maybe I can give
you better info now.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/