linux-kernel - Re: frequent lockups in 3.18rc4

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Date:	Fri, 5 Dec 2014 14:37:50 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Chris Mason <clm@...com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dâniel Fraga <fragabr@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On Fri, Dec 05, 2014 at 11:31:11AM -0800, Linus Torvalds wrote:
 > On Fri, Dec 5, 2014 at 10:48 AM, Dave Jones <davej@...hat.com> wrote:
 > >
 > > In the meantime, I rebooted into the same kernel, and ran trinity
 > > solely doing the lsetxattr syscalls.
 > 
 > Any particular reason for the lsetxattr guess? Just the last call
 > chain? I don't recognize it from the other traces, but maybe I just
 > didn't notice.

yeah just a wild guess, just that that trace looked so.. clean.

 > >   The load was a bit lower, so I
 > > cranked up the number of child processes to 512, and then this
 > > happened..
 >
 > Ugh. "dump_trace()" being broken and looping forever? I don't actually
 > believe it, because this isn't even on the exception stack (well, the
 > NMI dumper is, but that one worked fine - this is the "nested" dumping
 > of just the allocation call chain)
 >
 > Smells like more random callchains to me. Unless this one is repeatable.
 >
 > Limiting trinity to just lsetxattr is interesting. Did it make things
 > fail faster?

It sure failed quickly, but not in the "machine is totally locked up"
sense, just "shit is all corrupted" sense. So it might be a completely different
thing, or it could be a different manifestation of a corruptor.

I guess we'll see how things go now that I marked it 'bad'.

I'll give it a quick run with just lsetxattr again just to see what
happens, but before I leave this one run over the weekend, I'll switch
it back to "do everything", and pick it up again on Monday.

	Dave

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