Messages in this thread | | | Subject | Re: PROBLEM: oops | From | Peter Zijlstra <> | Date | Wed, 26 Aug 2009 07:49:02 +0200 |
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On Tue, 2009-08-25 at 23:23 +0200, Pawel Golaszewski wrote: > On Tue, 25 Aug 2009, Peter Zijlstra wrote: > > > > could you try to reproduce without that? > > > > > > > > CONFIG_GROUP_SCHED=n > > > I'll try. > > It seems that problem still exists - system has crashed too. From > netconsole:
> Any ideas? > > Last kernel I was using is 2.6.27.13 - works fine. None between 13 and 31 > tested...
# git log --format=oneline v2.6.27.13..v2.6.27.31 kernel/sched* 2b46f3769896dc04e1e49144d282e4655677105a wait: prevent exclusive waiter starvation
Nothing changed anywhere near the code that is falling apart..
Also:
[20621.263297] BUG: unable to handle kernel paging request at ffffffd8 [20621.263396] IP: [<c081cc50>] hrtick_start_fair+0x0/0x30
#ifndef CONFIG_FAIR_GROUP_SCHED
static inline struct cfs_rq *cfs_rq_of(struct sched_entity *se) { struct task_struct *p = task_of(se); struct rq *rq = task_rq(p);
return &rq->cfs; }
#endif
SCHED_FEAT(HRTICK, 0)
static void hrtick_start_fair(struct rq *rq, struct task_struct *p) { struct sched_entity *se = &p->se; struct cfs_rq *cfs_rq = cfs_rq_of(se);
WARN_ON(task_rq(p) != rq);
if (hrtick_enabled(rq) && cfs_rq->nr_running > 1) {
/* won't get here since HRTICK is disabled by default */
} }
Suggests something went terribly wrong and corrupted a fundamental data structure.
Maybe turning on each and every debug feature related to memory debugging might help.
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