Messages in this thread | | | Date | Thu, 10 Sep 2009 00:58:34 +0200 | From | Oleg Nesterov <> | Subject | Re: [PATCH v3] exec: do not sleep in TASK_TRACED under ->cred_guard_mutex |
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On 09/09, Chuck Ebbert wrote: > > On Fri, 4 Sep 2009 23:33:37 +0200 > Oleg Nesterov <oleg@redhat.com> wrote: > > > On 09/04, Andrew Morton wrote: > > > > > > On Fri, 4 Sep 2009 19:26:48 +0200 > > > Oleg Nesterov <oleg@redhat.com> wrote: > > > > > > > Tom Horsley reports that his debugger hangs when it tries to read > > > > /proc/pid_of_tracee/maps, this happens since > > > > > > > > "mm_for_maps: take ->cred_guard_mutex to fix the race with exec" > > > > 04b836cbf19e885f8366bccb2e4b0474346c02d > > > > > > > > commit in 2.6.31. > > > > > > I see a Cc:stable in the mail headers, but not in the changelog. I > > > don't think the patch is applicable to -stable unless we miss 2.6.31. > > > > -stable has the same problems but I agree, it can live without this fix. > > > > That patch was backported in 2.6.30.5 -- are you sure -stable doesn't need > this fix?
No, I am not sure, that is why I cc'ed -stable.
But otoh the problem is minor, both tracer and tracee can be killed.
I dunno. I don't know if gdb or any other "important" application read /proc/pid/maps after PTRACE_EVENT_EXEC...
Oleg.
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