Messages in this thread | ![/](/images/icornerl.gif) | | Subject | Re: ptrace patch fails stress testing | From | Alan Cox <> | Date | 02 Apr 2003 12:49:48 +0100 |
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On Tue, 2003-04-01 at 19:22, linas@austin.ibm.com wrote: > The problem appears to be that task->mm is dereferenced without > looking to see if mm is NULL. e.g. in the sched.h in the > is_dumpable() macro, we have task->mm->dumpable . I'm sitting > in front of a KDB session and I'm clearly looking at task->mm > which is NULL. > Why, how and under what conditions this race condition occurs, > I don't know. What the best fix is, I don't know.
Zombie process. The patch checks ->mm but must also check ->mm != NULL first.
> I can try to just add a check for NULL, but I'd like someone > to tell me that 'yes this is the right way to fix this.'
It is I think.
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