linux-kernel - [powerpc crash] Re: Linux 2.6.24-rc7 kernel BUG at kernel/sched.c:5156!

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Message-ID: <20080108161617.GC32273@elte.hu>
Date:	Tue, 8 Jan 2008 17:16:17 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	dmitry.adamushko@...il.com,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Andy Whitcroft <apw@...dowen.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Paul Mackerras <paulus@...ba.org>,
	Linas Vepstas <linas@...tin.ibm.com>,
	Kumar Gala <galak@...nel.crashing.org>
Subject: [powerpc crash] Re: Linux 2.6.24-rc7  kernel BUG at
	kernel/sched.c:5156!


* Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com> wrote:

> Hi,
> 
> When booting the 2.6.24-rc7 kernel on the powerpc, kernel bug at
> kernel.sched.c is triggered
> 
> [    0.000000] Kernel command line: ro console=hvc0 rhgb quiet root=LABEL=/ 
> [    0.149567] BUG: scheduling while atomic: kthreadd/2/0x0006f34c
> [    0.149655] BUG: scheduling while atomic: kthreadd/3/0xbe0d8168
> [    0.149714] ------------[ cut here ]------------
> [    0.149722] kernel BUG at kernel/sched.c:5156!

hm, that looks pretty nasty. Wondering why the atomic check did not 
produce a stacktrace. By the time we get to the migration thread's code 
it's probably late and we just get to see the effects of data 
corruption.

	Ingo
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