Re: [PATCH v3] exec: do not sleep in TASK_TRACED under->cred_guard_mutex
From: Oleg Nesterov
Date: Fri Sep 04 2009 - 17:39:21 EST
On 09/04, Andrew Morton wrote:
> On Fri, 4 Sep 2009 19:26:48 +0200
> Oleg Nesterov <oleg@xxxxxxxxxx> 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 get a reject in binfmts.h because your kernel has `extern void
> set_binfmt' and mine has `extern int set_binfmt'.
Ah, I have exec-fix-set_binfmt-vs-sys_delete_module-race.patch from -mm
> Hopefully this patch works OK in mainline as well as in whatever kernel
> you tested against!
Yes I tried to test it ;)
> 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.
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