Re: New crashes walking proc with Saturday's git

From: Chris Mason
Date: Sun Nov 23 2014 - 11:36:37 EST

On Sun, Nov 23, 2014 at 11:32 AM, Borislav Petkov <bp@xxxxxxxxx> wrote:
On Sun, Nov 23, 2014 at 11:16:51AM -0500, Chris Mason wrote:
It must be:

commit 6e998916dfe327e785e7c2447959b2c1a3ea4930
Author: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
Date: Wed Nov 12 16:58:44 2014 +0100

sched/cputime: Fix clock_nanosleep()/clock_gettime() inconsistency

I'll do two runs to confirm, but it's the only related patch between rc5 and

Cool, let me know and I'll revert here too to verify. It might take a
while to confirm as it happens only during resume but I could try the
fork bomb if I must.

From looking at it I'm not getting any smarter. We iterate over the
threads under a rcu_read_lock() so we should be protected. Unless the
sched changes have somehow effect on RCU grace periods but WTH do I
know... This is crazy code.

+ p->sched_class->update_curr(rq);

Total guess while I'm waiting for the test, but somehow this is NULL.


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