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From: Andrew Morton <akpm@osdl.org>
To: petkov@math.uni-muenster.de
Cc: Borislav Petkov <bbpetkov@yahoo.de>,
	linux-kernel@vger.kernel.org,
	Davide Libenzi <davidel@xmailserver.org>,
	Ingo Molnar <mingo@elte.hu>
Subject: Re: 2.6.18-mm2 - possible recursive locking detected
Date: Sat, 30 Sep 2006 01:28:10 -0700	[thread overview]
Message-ID: <20060930012810.d79dc8e6.akpm@osdl.org> (raw)
In-Reply-To: <20060930070406.GA7090@gollum.tnic>

On Sat, 30 Sep 2006 09:04:06 +0200
Borislav Petkov <bbpetkov@yahoo.de> wrote:

> On Thu, Sep 28, 2006 at 01:46:23AM -0700, Andrew Morton wrote:
> Hi,
> 
>     .config is at http://tim.dnsalias.org/2.6.18-mm2.cfg.
> 
> Sep 30 08:38:17 zmei kernel: [  285.197902] 
> Sep 30 08:38:19 zmei kernel: [  285.197905] =============================================
> Sep 30 08:38:19 zmei kernel: [  285.204776] [ INFO: possible recursive locking detected ]
> Sep 30 08:38:19 zmei kernel: [  285.210163] 2.6.18-mm2 #1
> Sep 30 08:38:19 zmei kernel: [  285.212782] ---------------------------------------------
> Sep 30 08:38:19 zmei kernel: [  285.218168] swapper/0 is trying to acquire lock:
> Sep 30 08:38:19 zmei kernel: [  285.222777]  (&q->lock){++..}, at: [<c0112f70>] __wake_up+0x15/0x3b
> Sep 30 08:38:19 zmei kernel: [  285.229114] 
> Sep 30 08:38:19 zmei kernel: [  285.229115] but task is already holding lock:
> Sep 30 08:38:19 zmei kernel: [  285.234952]  (&q->lock){++..}, at: [<c0112f70>] __wake_up+0x15/0x3b
> Sep 30 08:38:19 zmei kernel: [  285.241290] 
> Sep 30 08:38:19 zmei kernel: [  285.241291] other info that might help us debug this:
> Sep 30 08:38:19 zmei kernel: [  285.247817] 4 locks held by swapper/0:
> Sep 30 08:38:19 zmei kernel: [  285.251561]  #0:  (&tp->rx_lock){-+..}, at: [<c020f350>] rtl8139_poll+0x42/0x405
> Sep 30 08:38:19 zmei kernel: [  285.259041]  #1:  (slock-AF_INET/1){-+..}, at: [<c02aa753>] tcp_v4_rcv+0x3fa/0x8eb
> Sep 30 08:38:19 zmei kernel: [  285.266700]  #2:  (af_callback_keys + sk->sk_family#3){-.-?}, at: [<c0278d83>] sock_def_readable+0x15/0x69
> Sep 30 08:38:19 zmei kernel: [  285.276454]  #3:  (&q->lock){++..}, at: [<c0112f70>] __wake_up+0x15/0x3b
> Sep 30 08:38:19 zmei kernel: [  285.283241] 
> Sep 30 08:38:19 zmei kernel: [  285.283242] stack backtrace:
> Sep 30 08:38:19 zmei kernel: [  285.287688]  [<c0103b65>] dump_trace+0x64/0x1cd
> Sep 30 08:38:19 zmei kernel: [  285.292243]  [<c0103ce0>] show_trace_log_lvl+0x12/0x25
> Sep 30 08:38:19 zmei kernel: [  285.297405]  [<c010431c>] show_trace+0xd/0x10
> Sep 30 08:38:19 zmei kernel: [  285.301780]  [<c01043e4>] dump_stack+0x19/0x1b
> Sep 30 08:38:19 zmei kernel: [  285.306250]  [<c013022d>] __lock_acquire+0x750/0x96c
> Sep 30 08:38:19 zmei kernel: [  285.311304]  [<c013098c>] lock_acquire+0x4b/0x6b
> Sep 30 08:38:19 zmei kernel: [  285.316005]  [<c02ca474>] _spin_lock_irqsave+0x2c/0x3c
> Sep 30 08:38:19 zmei kernel: [  285.321233]  [<c0112f70>] __wake_up+0x15/0x3b
> Sep 30 08:38:19 zmei kernel: [  285.325638]  [<c0178dd4>] ep_poll_safewake+0x91/0xc3
> Sep 30 08:38:19 zmei kernel: [  285.330760]  [<c0179c69>] ep_poll_callback+0x83/0x8e
> Sep 30 08:38:19 zmei kernel: [  285.335888]  [<c01122e5>] __wake_up_common+0x2f/0x53
> Sep 30 08:38:19 zmei kernel: [  285.340898]  [<c0112f83>] __wake_up+0x28/0x3b
> Sep 30 08:38:19 zmei kernel: [  285.345312]  [<c0278da8>] sock_def_readable+0x3a/0x69
> Sep 30 08:38:20 zmei kernel: [  285.350778]  [<c02a1892>] tcp_data_queue+0x50f/0xa53
> Sep 30 08:38:20 zmei kernel: [  285.356232]  [<c02a34c3>] tcp_rcv_established+0x5aa/0x64f
> Sep 30 08:38:20 zmei kernel: [  285.362077]  [<c02a86f6>] tcp_v4_do_rcv+0x26/0x2f2
> Sep 30 08:38:20 zmei kernel: [  285.367322]  [<c02aabd4>] tcp_v4_rcv+0x87b/0x8eb

<looks at ep_poll_safewake>

<falls out of chair>

We'll need to teach lockdep about that one, but I don't have a clue how.

Is it not vulnerable to ab/ba deadlocking?



  reply	other threads:[~2006-09-30  8:28 UTC|newest]

Thread overview: 140+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-09-28  8:46 2.6.18-mm2 Andrew Morton
2006-09-28 11:54 ` 2.6.18-mm2 Michal Piotrowski
2006-09-29 12:12   ` md deadlock (was Re: 2.6.18-mm2) Peter Zijlstra
2006-09-29 12:52     ` Neil Brown
2006-09-29 14:03       ` Peter Zijlstra
2006-10-02 13:47         ` Peter Zijlstra
2006-10-10  3:53           ` Neil Brown
2006-10-10  6:42             ` Ingo Molnar
2006-09-28 17:50 ` 2.6.18-mm2 Steve Fox
2006-09-28 19:00   ` 2.6.18-mm2 thunder7
2006-09-28 21:01   ` 2.6.18-mm2 Andrew Morton
2006-09-28 22:45     ` 2.6.18-mm2 Stephen Hemminger
2006-10-04 13:42     ` 2.6.18-mm2 boot failure on x86-64 Steve Fox
2006-10-04 15:45       ` Andrew Morton
2006-10-04 15:55         ` Vivek Goyal
2006-10-04 15:56         ` Andi Kleen
2006-10-05  1:57           ` Keith Mannthey
2006-10-04 16:41         ` Steve Fox
2006-10-05  0:06           ` Andrew Morton
2006-10-05  0:51             ` Vivek Goyal
2006-10-05  0:57               ` Andi Kleen
2006-10-05  1:08                 ` Martin Bligh
2006-10-05  2:05                   ` Keith Mannthey
2006-10-05 14:53                   ` Steve Fox
2006-10-05 15:12                     ` Badari Pulavarty
2006-10-05 15:32                       ` Steve Fox
2006-10-05 15:40                         ` Andi Kleen
2006-10-05 17:57                           ` Steve Fox
2006-10-05 18:27                             ` Andi Kleen
2006-10-05 18:51                               ` Steve Fox
2006-10-05 19:05                                 ` Andi Kleen
2006-10-05 20:42                                   ` Steve Fox
2006-10-05 20:50                                     ` Andi Kleen
2006-10-06  2:23                                       ` Steve Fox
2006-10-06 14:33                                         ` Mel Gorman
2006-10-06 15:36                                           ` Vivek Goyal
2006-10-06 17:11                                             ` Mel Gorman
2006-10-06 17:34                                               ` Vivek Goyal
2006-10-06 17:59                                               ` Vivek Goyal
2006-10-06 18:03                                               ` Steve Fox
2006-10-06 20:04                                                 ` Vivek Goyal
2006-10-09  9:53                                                   ` Mel Gorman
2006-10-16 18:16                                                     ` Vivek Goyal
2006-10-16 23:58                                                       ` Andrew Morton
2006-10-17 12:18                                                         ` Adrian Bunk
2006-10-17 17:32                                                           ` Mel Gorman
2006-10-05 18:52                               ` Vivek Goyal
2006-10-05 19:08                                 ` Andi Kleen
2006-10-05 20:25                                   ` Steve Fox
2006-10-05 20:39                                   ` Mel Gorman
2006-10-05 20:51                                     ` Andi Kleen
2006-10-05 23:14                                       ` 2.6.18-mm2 boot failure on x86-64 II Andi Kleen
2006-10-05 23:32                                         ` keith mannthey
2006-10-05 23:35                                           ` Andi Kleen
2006-10-05 23:58                                             ` keith mannthey
2006-10-06  0:02                                               ` Badari Pulavarty
2006-10-06  0:12                                                 ` Andrew Morton
2006-09-28 22:39 ` 2.6.18-mm2 Jim Cromie
2006-09-28 23:08   ` 2.6.18-mm2 Andi Kleen
2006-09-29 20:14     ` 2.6.18-mm2 Ingo Molnar
2006-09-29 20:36       ` 2.6.18-mm2 Andi Kleen
2006-09-29 20:32         ` 2.6.18-mm2 Ingo Molnar
2006-09-29 20:58           ` 2.6.18-mm2 Andi Kleen
2006-09-29 21:14             ` [patch] fix !apic build breakage Ingo Molnar
2006-09-29 21:44               ` Andi Kleen
2006-09-29 21:41                 ` Ingo Molnar
2006-09-29 21:44             ` 2.6.18-mm2 Alan Cox
2006-09-29 21:36         ` 2.6.18-mm2 Dave Jones
2006-09-29 21:46           ` 2.6.18-mm2 Andi Kleen
2006-09-28 22:44 ` 2.6.18-mm2 Matthias Hentges
2006-09-29  3:19 ` 2.6.18-mm2 - oops in cache_alloc_refill() Valdis.Kletnieks
2006-09-29  3:29   ` Andrew Morton
2006-09-29  3:58     ` Valdis.Kletnieks
2006-09-29 15:19     ` Valdis.Kletnieks
2006-09-29 19:45       ` Andrew Morton
2006-09-30  0:01         ` Valdis.Kletnieks
2006-09-30  1:20           ` Andrew Morton
2006-09-30  1:33             ` Jean Tourrilhes
2006-09-30  3:31               ` Valdis.Kletnieks
2006-09-30  7:50                 ` Valdis.Kletnieks
2006-09-30  8:33                   ` Andrew Morton
2006-09-30  1:40             ` Jean Tourrilhes
2006-09-30  3:31               ` Valdis.Kletnieks
2006-09-30  1:57             ` Makefile for linux modules x z
2006-09-30  8:55               ` Sam Ravnborg
2006-09-30  1:59             ` x z
2006-10-02 17:52             ` 2.6.18-mm2 - oops in cache_alloc_refill() Jean Tourrilhes
2006-10-02 19:57               ` Valdis.Kletnieks
2006-10-03 15:58               ` Samuel Tardieu
2006-10-03 16:34                 ` Jean Tourrilhes
2006-10-03 16:45                   ` Samuel Tardieu
2006-10-03 17:07                     ` Jean Tourrilhes
2006-10-05 22:37                   ` Pavel Roskin
2006-10-05 22:42                     ` Jean Tourrilhes
2006-09-29 19:47       ` Christoph Lameter
2006-09-29 13:57 ` 2.6.18-mm2 J.A. Magallón
2006-09-29 14:39   ` 2.6.18-mm2 Matthew Wilcox
2006-09-29 17:15     ` 2.6.18-mm2 Alan Cox
2006-09-29 23:50       ` 2.6.18-mm2 Frederik Deweerdt
2006-09-29 23:43         ` 2.6.18-mm2 Alan Cox
2006-09-30 14:09           ` [-mm patch] aic7xxx: check irq validity (was Re: 2.6.18-mm2) Frederik Deweerdt
2006-09-30 14:19             ` Alan Cox
2006-09-30 13:51               ` Willy Tarreau
2006-09-30 23:58             ` Jeff Garzik
2006-10-01 14:28               ` Matthew Wilcox
2006-10-01 19:05                 ` Arjan van de Ven
2006-10-01 19:19                   ` Jeff Garzik
2006-10-01 19:34                     ` Arjan van de Ven
2006-10-01 19:36                   ` Matthew Wilcox
2006-10-01 19:42                     ` Jeff Garzik
2006-10-02  2:12                     ` Arjan van de Ven
2006-10-02 20:00                       ` [RFC PATCH] pci_request_irq (was [-mm patch] aic7xxx: check irq validity) Frederik Deweerdt
2006-10-02 18:15                         ` Matthew Wilcox
2006-10-02 21:09                           ` Frederik Deweerdt
2006-10-02 20:07                         ` [RFC PATCH] move aic7xxx to pci_request_irq Frederik Deweerdt
2006-10-02 18:27                           ` Matthew Wilcox
2006-10-02 21:02                             ` Frederik Deweerdt
2006-10-03  3:45                           ` Arjan van de Ven
2006-10-02 20:11                         ` [RFC PATCH] move tg3 " Frederik Deweerdt
2006-10-02 18:28                           ` Matthew Wilcox
2006-10-02 21:04                             ` Frederik Deweerdt
2006-10-03  7:18                           ` Arjan van de Ven
2006-10-02 20:12                         ` [RFC PATCH] move drm " Frederik Deweerdt
2006-10-02 18:37                           ` Matthew Wilcox
2006-10-02 21:07                             ` Frederik Deweerdt
2006-10-02 20:36                           ` Alan Cox
2006-10-02 22:26                             ` Frederik Deweerdt
2006-10-02 23:54                           ` Dave Airlie
2006-10-03  7:17                             ` Frederik Deweerdt
2006-10-03  3:58                         ` [RFC PATCH] pci_request_irq (was [-mm patch] aic7xxx: check irq validity) Randy Dunlap
2006-10-01 21:31               ` [-mm patch] aic7xxx: check irq validity (was Re: 2.6.18-mm2) Frederik Deweerdt
2006-09-30 15:26         ` 2.6.18-mm2 James Bottomley
2006-09-30 16:21           ` 2.6.18-mm2 Matthew Wilcox
2006-09-30 17:20             ` 2.6.18-mm2 Mark Rustad
2006-09-30 20:54           ` 2.6.18-mm2 Alan Cox
2006-09-29 23:15     ` 2.6.18-mm2 J.A. Magallón
2006-09-30  7:04 ` 2.6.18-mm2 - possible recursive locking detected Borislav Petkov
2006-09-30  8:28   ` Andrew Morton [this message]
2006-09-30 18:19     ` Davide Libenzi
     [not found] ` <20060930133706.GA3291@melchior.yamamaya.is-a-geek.org>
2006-09-30 19:53   ` 2.6.18-mm2 Andrew Morton

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