Messages in this thread |  | | | Date | Sun, 25 May 2003 13:23:59 +0200 | | From | Manfred Spraul <> | | Subject | Re: [RFC][PATCH][2.5] Possible race in wait_task_zombie and finish_task_switch |
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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
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