linux-kernel - Re: [PATCH][GIT PULL] tracing: Fix compile issue for trace_sched

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Message-ID: <20101022183900.GG6498@redhat.com>
Date:	Fri, 22 Oct 2010 14:39:01 -0400
From:	Jason Baron <jbaron@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	masami.hiramatsu.pt@...achi.com
Subject: Re: [PATCH][GIT PULL] tracing: Fix compile issue for
	trace_sched_wakeup.c

On Fri, Oct 22, 2010 at 08:24:33PM +0200, Ingo Molnar wrote:
> * Jason Baron <jbaron@...hat.com> wrote:
> 
> > On Thu, Oct 21, 2010 at 01:09:25PM +0200, Ingo Molnar wrote:
> > > * Ingo Molnar <mingo@...e.hu> wrote:
> > > 
> > > > 
> > > > * Jason Baron <jbaron@...hat.com> wrote:
> > > > 
> > > > > [...] Do we always fail after "Testing all events:" is printed? [...]
> > > > 
> > > > Yes, in all cases i checked. Sometimes it's an oops.
> > > 
> > > Such as this one:
> > > 
> > > [    6.724449] Testing event kmalloc_node: OK
> > > [    6.744459] Testing event kmem_cache_alloc_node: 
> > > [    6.749111] BUG: unable to handle kernel paging request at ffffffff
> > > [    6.752000] IP: [<f6425f7c>] 0xf6425f7c
> > > [    6.752000] *pde = 01384067 *pte = 00000000 
> > > [    6.752000] Oops: 0002 [#1] PREEMPT SMP 
> > > [    6.752000] last sysfs file: 
> > > [    6.752000] Modules linked in:
> > > [    6.752000] 
> > > [    6.752000] Pid: 2, comm: kthreadd Not tainted 2.6.36-rc8-tip+ #50831 /
> > > [    6.752000] EIP: 0060:[<f6425f7c>] EFLAGS: 00010282 CPU: 0
> > > [    6.752000] EIP is at 0xf6425f7c
> > > [    6.752000] EAX: ffffffff EBX: c1021c4f ECX: 00000001 EDX: 00000000
> > > [    6.752000] ESI: f6425f7c EDI: fffffff4 EBP: f640c000 ESP: f6425ee4
> > > [    6.752000]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> > > [    6.752000] Process kthreadd (pid: 2, ti=f6424000 task=f640c000 task.ti=f6424000)
> > > [    6.752000] Stack:
> > > [    6.752000]  c1021c4f f640c02c 00800711 00000000 00000000 00000000 f6425f7c f6809880
> > > [    6.752000] <0> f6425f7c 00000000 00000000 f6425f7c c1022a54 00000000 00000000 00000000
> > > [    6.752000] <0> 00000000 00800711 00000000 00000000 00000000 c101d94a f6809880 c131f3a0
> > > [    6.752000] Call Trace:
> > > [    6.752000]  [<c1021c4f>] ? copy_process+0xa1/0xd6d
> > > [    6.752000]  [<c1022a54>] ? do_fork+0x139/0x2ca
> > > [    6.752000]  [<c101d94a>] ? dequeue_task+0xb9/0xc8
> > > [    6.752000]  [<c1245597>] ? schedule+0x821/0x84b
> > > [    6.752000]  [<c1038079>] ? kthread+0x0/0x68
> > > [    6.752000]  [<c1007930>] ? kernel_thread+0x77/0x7f
> > > [    6.752000]  [<c1038079>] ? kthread+0x0/0x68
> > > [    6.752000]  [<c1002cbc>] ? kernel_thread_helper+0x0/0x10
> > > [    6.752000]  [<c1038172>] ? kthreadd+0x91/0xc7
> > > [    6.752000]  [<c10380e1>] ? kthreadd+0x0/0xc7
> > > [    6.752000]  [<c1002cc2>] ? kernel_thread_helper+0x6/0x10
> > > [    6.752000] Code: 98 80 f6 00 c0 40 f6 a9 37 61 f9 11 07 80 00 79 80 03 c1 c0 5f 42 f6 7c 5f 42 f6 30 79 00 c1 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 79 80 03 c1 70 3f 42 f6 00 
> > > [    6.752000] EIP: [<f6425f7c>] 0xf6425f7c SS:ESP 0068:f6425ee4
> > > [    6.752000] CR2: 00000000ffffffff
> > > [    6.752000] ---[ end trace 6000cf675d3eddec ]---
> > > 
> > > (captured two days ago)
> > > 
> > > Full bootlog is attached below.
> > > 
> > > Thanks,
> > > 
> > > 	Ingo
> > > 
> > 
> > Hi,
> > 
> > this looks potentially like a separate issue from the 'hang' one - I'm wondering 
> > if this was re-produced with the same .config as the 'hang' case? I haven't been 
> > able to hit this one yet....
> 
> Not the same config, and it's very spurious - i.e. a slightly different -tip version 
> with the same config will boot fine. (this suggests some race)
> 

if possible, can you post that .config?

thanks,

-Jason
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