From: Manfred Spraul <manfred@colorfullife.com>
To: "Mika Penttilä" <mika.penttila@kolumbus.fi>
Cc: Zwane Mwaikambo <zwane@linuxpower.ca>,
Ingo Molnar <mingo@elte.hu>,
Linux Kernel <linux-kernel@vger.kernel.org>,
William Lee Irwin III <wli@holomorphy.com>
Subject: Re: [RFC][PATCH][2.5] Possible race in wait_task_zombie and finish_task_switch
Date: Sun, 25 May 2003 13:23:59 +0200 [thread overview]
Message-ID: <3ED0A7CF.9040803@colorfullife.com> (raw)
In-Reply-To: <3ED0A248.10308@kolumbus.fi>
Do we have an idea which reference is miscounted? It seems that there
are 4 different kinds of references to a task structure:
- the reference for the stack itself, acquired by setting usage to 2,
dropped by schedule_tail.
- the reference for wait4, acquired by setting usage to 2, dropped by
wait_task_zombie.
- references for the pid structures, maintained by pid.c
- temporary references for looking at tsk->{fs,mm,files,tty}, used by
/proc, ptrace, tty.
>kernel BUG at kernel/sched.c:746!
>
>
Hmm. What is schedule.c:746? There is no BUG in that area in the bk tree.
Zwane, is it easy to reproduce the crash? I could write a patch that
adds 4 refcounters, then we could find out in which area we must look.
--
Manfred
next prev parent reply other threads:[~2003-05-25 11:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-25 10:11 [RFC][PATCH][2.5] Possible race in wait_task_zombie and finish_task_switch Zwane Mwaikambo
2003-05-25 10:27 ` Ingo Molnar
2003-05-25 10:29 ` Zwane Mwaikambo
2003-05-25 11:00 ` Mika Penttilä
2003-05-25 11:23 ` Manfred Spraul [this message]
2003-05-25 11:29 ` Zwane Mwaikambo
2003-05-25 20:31 ` William Lee Irwin III
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