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Date: Sat, 14 Jun 2008 20:30:01 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Alexey Dobriyan <adobriyan@...il.com> Cc: Oleg Nesterov <oleg@...sign.ru>, Adrian Bunk <bunk@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: [Bug #10815] 2.6.26-rc4: RIP find_pid_ns+0x6b/0xa0 On Sat, Jun 14, 2008 at 11:43:38PM +0400, Alexey Dobriyan wrote: > On Sat, Jun 14, 2008 at 11:12:12AM -0700, Paul E. McKenney wrote: > > On Sat, Jun 14, 2008 at 06:58:39PM +0400, Oleg Nesterov wrote: > > > On 06/14, Paul E. McKenney wrote: > > > > > > > > On Fri, Jun 13, 2008 at 04:52:55PM +0300, Adrian Bunk wrote: > > > > > On Sat, Jun 07, 2008 at 10:42:57PM +0200, Rafael J. Wysocki wrote: > > > > > > This message has been generated automatically as a part of a report > > > > > > of recent regressions. > > > > > > > > > > > > The following bug entry is on the current list of known regressions > > > > > > from 2.6.25. Please verify if it still should be listed. > > > > > > > > > > > > > > > > > > Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=10815 > > > > > > Subject : 2.6.26-rc4: RIP find_pid_ns+0x6b/0xa0 > > > > > > Submitter : Alexey Dobriyan <adobriyan@...il.com> > > > > > > Date : 2008-05-27 09:23 (12 days old) > > > > > > References : http://lkml.org/lkml/2008/5/27/9 > > > > > > Handled-By : Oleg Nesterov <oleg@...sign.ru> > > > > > > Linus Torvalds <torvalds@...ux-foundation.org> > > > > > > Paul E. McKenney <paulmck@...ux.vnet.ibm.com> > > > > > > Patch : http://lkml.org/lkml/2008/5/28/16 > > > > > > > > > > What happened with this issue? > > > > > > > > The patch listed above works for me, passes rcutorture, &c. However, > > > > I never have been able to reproduce the original problem, so cannot say > > > > whether it qualifies as a fix. > > > > > > I doubt very much RCU was the reason of this problem. > > > > Although I very much appreciate your confidence in my code, it is new > > code, so therefore under suspicion. > > > > > Alexey, how did you trigger this problem? > > > > One of them involved running LTP while doing 170 kernel builds in > > parallel. > > My gut feeling is that find_pid_ns oops, __d_lookup oops and > __call_for_each_cic oops are the same bug. > > And rcutorture failures I've mentioned to Paul privately. Yep, running rcutorture in parallel with LTP, which didn't reproduce for me either. Did the patch at http://lkml.org/lkml/2008/5/28/16 help? > Oleg, debugging you've posted never triggered. > > kerneloops suggests that I'm alone. :-( Assuming that the above patch didn't help... As a desperation measure, I could suggest the following patch. Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> --- rcupreempt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -urpNa -X dontdiff linux-2.6.26-rc4/kernel/rcupreempt.c linux-2.6.26-rc4-alexey/kernel/rcupreempt.c --- linux-2.6.26-rc4/kernel/rcupreempt.c 2008-05-30 04:39:01.000000000 -0700 +++ linux-2.6.26-rc4-alexey/kernel/rcupreempt.c 2008-06-14 20:24:53.000000000 -0700 @@ -77,7 +77,7 @@ * * GP in GP_STAGES stands for Grace Period ;) */ -#define GP_STAGES 2 +#define GP_STAGES 3 struct rcu_data { spinlock_t lock; /* Protect rcu_data fields. */ long completed; /* Number of last completed batch. */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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