Messages in this thread | | | Date | Sun, 25 May 2003 07:29:25 -0400 (EDT) | From | Zwane Mwaikambo <> | Subject | Re: [RFC][PATCH][2.5] Possible race in wait_task_zombie and finish_task_switch |
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On Sun, 25 May 2003, Manfred Spraul wrote:
> - 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.
it's the one dropped by wait_task_zombie, the task coming out from schedule_tail is fine.
> > >kernel BUG at kernel/sched.c:746! > > > > > Hmm. What is schedule.c:746? There is no BUG in that area in the bk tree.
It's in finish_arch_switch at the put_task_struct()
> 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.
I haven't found a direct way of triggering it, so far it's just been cropping up ~6 times over a period of 2days with the box normally taking a fatal one and dying completely.
Zwane -- function.linuxpower.ca - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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