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Message-Id: <200806241151.10775.nickpiggin@yahoo.com.au> Date: Tue, 24 Jun 2008 11:51:10 +1000 From: Nick Piggin <nickpiggin@...oo.com.au> To: Linus Torvalds <torvalds@...ux-foundation.org> Cc: Alexey Dobriyan <adobriyan@...il.com>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Oleg Nesterov <oleg@...sign.ru>, Adrian Bunk <bunk@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org Subject: Re: [Bug #10815] 2.6.26-rc4: RIP find_pid_ns+0x6b/0xa0 On Tuesday 24 June 2008 11:31, Linus Torvalds wrote: > On Tue, 24 Jun 2008, Alexey Dobriyan wrote: > > Status update: > > * bug is reproduced on another box with the very same symptoms: > > SMP=y, maxcpus=1 kernel occasionally fails, SMP=n is fine. > > Also Core 2 Duo, x86_64 [1] > > > > Race is wide -- 60 seconds of rcutorture is enough. > > Very odd how you can reproduce it - now on two machines - but it doesn't > seem to happen for others. You've tried different compilers, you've tried > different config options, what the heck is left? The PREEMPT_RCU thing? I've reproduced it. It hits lockless pagecache, but I've also reproduced the same problem in dentry cache shrinking. I'm sure it is a free-before-grace bug. I've been using DEBUG_PAGEALLOC to make it easier to spot. -- 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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