linux-kernel - Re: [Bugme-new] [Bug 15709] New: swapper page allocation failure

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Date:	Mon, 26 Apr 2010 22:25:41 +0200
From:	Robert Wimmer <kernel@...ceti.net>
To:	Trond Myklebust <Trond.Myklebust@...app.com>
CC:	"Michael S. Tsirkin" <mst@...hat.com>, Avi Kivity <avi@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	bugzilla-daemon@...zilla.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Mel Gorman <mel@....ul.ie>, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Bugme-new] [Bug 15709] New: swapper page allocation failure


>>> I've added CONFIG_KALLSYMS and CONFIG_KALLSYMS_ALL
>>> to my .config. I've uploaded the dmesg output. Maybe it
>>> helps a little bit:
>>>
>>> https://bugzilla.kernel.org/attachment.cgi?id=26138
>>>
>>> - Robert
>>>
>>>       
> That last trace is just saying that the NFSv4 reboot recovery code is
> crashing (which is hardly surprising if the memory management is hosed).
>
> The initial bisection makes little sense to me: it is basically blaming
> a page allocation problem on a change to the NFSv4 mount code. The only
> way I can see that possibly happen is if you are hitting a stack
> overflow.
> So 2 questions:
>
>   - Are you able to reproduce the bug when using NFSv3 instead?
>   

I've tried with NFSv3 now. With v4 the error normally occur
within 5 minutes. The VM is now running for one hour and no
soft lockup so far. So I would say it can't be reproduced with
v3.

>   - Have you tried running with stack tracing enabled?
>   

Can you explain this a little bit more please? CONFIG_STACKTRACE=y
was already enabled. I've now enabled

CONFIG_USER_STACKTRACE_SUPPORT=y
CONFIG_NOP_TRACER=y
CONFIG_HAVE_FTRACE_NMI_ENTER=y
CONFIG_HAVE_FUNCTION_TRACER=y
CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST=y
CONFIG_HAVE_DYNAMIC_FTRACE=y
CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
CONFIG_HAVE_FTRACE_SYSCALLS=y
CONFIG_FTRACE_NMI_ENTER=y
CONFIG_CONTEXT_SWITCH_TRACER=y
CONFIG_GENERIC_TRACER=y
CONFIG_FTRACE=y
CONFIG_FUNCTION_TRACER=y
CONFIG_FUNCTION_GRAPH_TRACER=y
CONFIG_FTRACE_SYSCALLS=y
CONFIG_STACK_TRACER=y
CONFIG_KMEMTRACE=y
CONFIG_DYNAMIC_FTRACE=y
CONFIG_FTRACE_MCOUNT_RECORD=y
CONFIG_HAVE_MMIOTRACE_SUPPORT=y

and run

echo 1 > /proc/sys/kernel/stack_tracer_enabled

But the output is mostly the same in dmesg/
var/log/messages. Can you please guide me how I can
enable the stack tracing you need?

Thanks!
Robert

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