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From: "Martin J. Bligh" <mbligh@aracnet.com>
To: Anton Blanchard <anton@samba.org>, Ingo Molnar <mingo@elte.hu>
Cc: Zwane Mwaikambo <zwane@arm.linux.org.uk>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [patch] sched-HT-2.6.0-test11-A5
Date: Sun, 07 Dec 2003 09:16:59 -0800	[thread overview]
Message-ID: <1039560000.1070817418@[10.10.2.4]> (raw)
In-Reply-To: <20031207163914.GB19412@krispykreme>

>> i've seen a similar crash once on a 2-way (4-way) HT box, so there some
>> startup race going on most likely.
> 
> Im seeing bootup crashes every now and then on a ppc64 box too. A few
> other things Ive noticed:

ALT+sysrq+t does nothing, but NMI watchdog gives me:

-----------------------------------------

Starting migration thread for cpu 0
NMI Watchdog detected LOCKUP on CPU0, eip c011c11b, registers:
CPU:    0
EIP:    0060:[<c011c11b>]    Not tainted
EFLAGS: 00000086
EIP is at .text.lock.sched+0xee/0x243
eax: 0000000c   ebx: 00000286   ecx: f018a000   edx: c3932bc0
esi: 0000000c   edi: c3932bc0   ebp: f018bfb4   esp: f018bfac
ds: 007b   es: 007b   ss: 0068
Process migration/0 (pid: 2, threadinfo=f018a000 task=f018f330)
Stack: 00000000 00000000 f018bfec c011befe 02000000 00000020 c011bd54 00000000 
       00000000 f018f330 c0309c60 c0309c60 f018a000 f018a000 00000000 00000063 
       00000000 c0107001 f01a3fac 00000000 00000000 
Call Trace:
 [<c011befe>] migration_task+0x1aa/0x1b4
 [<c011bd54>] migration_task+0x0/0x1b4
 [<c0107001>] kernel_thread_helper+0x5/0xc

Code: 7e f8 e9 44 e6 ff ff f3 90 80 7e 04 00 7e f8 e9 6b e6 ff ff 
console shuts up ...

---------------------------------------------

 [<c011befe>] migration_task+0x1aa/0x1b4

is just after the return from complete, so I'd say we're deadlocked
on "spin_lock_irqsave(&x->wait.lock, flags);" in complete. Afraid I 
don't understand what the completion / migration stuff is attempting 
to do, so can't be more help ... I can reproduce this 100% of the 
time if you want something tried though.

M.



  reply	other threads:[~2003-12-07 17:46 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20031117021511.GA5682@averell>
     [not found] ` <3FB83790.3060003@cyberone.com.au>
     [not found]   ` <20031117141548.GB1770@colin2.muc.de>
     [not found]     ` <Pine.LNX.4.56.0311171638140.29083@earth>
     [not found]       ` <20031118173607.GA88556@colin2.muc.de>
     [not found]         ` <Pine.LNX.4.56.0311181846360.23128@earth>
     [not found]           ` <20031118235710.GA10075@colin2.muc.de>
     [not found]             ` <3FBAF84B.3050203@cyberone.com.au>
     [not found]               ` <501330000.1069443756@flay>
     [not found]                 ` <3FBF099F.8070403@cyberone.com.au>
     [not found]                   ` <1010800000.1069532100@[10.10.2.4]>
     [not found]                     ` <3FC01817.3090705@cyberone.com.au>
2003-11-23 11:57                       ` [RFC] generalise scheduling classes Nick Piggin
2003-11-23 12:01                         ` Ingo Molnar
2003-11-23 12:15                           ` Nick Piggin
2003-11-23 12:21                             ` Ingo Molnar
2003-11-23 16:26                           ` Martin J. Bligh
2003-12-01 10:08                             ` [patch] sched-HT-2.6.0-test11-A5 Ingo Molnar
2003-12-06 19:01                               ` Martin J. Bligh
2003-12-06 21:40                                 ` Zwane Mwaikambo
2003-12-07 13:34                                   ` Ingo Molnar
2003-12-07 16:39                                     ` Anton Blanchard
2003-12-07 17:16                                       ` Martin J. Bligh [this message]
2003-12-07 18:31                                         ` Zwane Mwaikambo
2003-12-07 20:17                                         ` Anton Blanchard
2003-12-08 17:57                                           ` Ingo Molnar
2003-12-07 17:22                                       ` Anton Blanchard
2003-12-08 17:56                               ` William Lee Irwin III
2003-12-08 18:21                                 ` Ingo Molnar
2003-12-08 19:12                                   ` William Lee Irwin III
2003-12-08 22:20                                   ` age
2003-12-08 19:36                                 ` William Lee Irwin III
2003-11-23 21:38                         ` [RFC] generalise scheduling classes William Lee Irwin III
2003-11-24  2:19                           ` Nick Piggin
2003-11-24  1:06                         ` Anton Blanchard
2003-11-24  2:26                           ` Nick Piggin
2003-11-24  2:39                             ` Davide Libenzi
2003-11-24 22:48                         ` bill davidsen
2003-11-25  1:46                           ` Nick Piggin
2003-11-25 16:23                             ` Bill Davidsen
2003-11-30  9:35                   ` [RFC] Further SMP / NUMA scheduler improvements Nick Piggin

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