linux-kernel - Re: 2.6.18-rc5-mm1 + all hotfixes -- INFO: possible recursive locking detected

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Message-Id: <20060905111306.80398394.akpm@osdl.org>
Date:	Tue, 5 Sep 2006 11:13:06 -0700
From:	Andrew Morton <akpm@...l.org>
To:	"Miles Lane" <miles.lane@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"Herbert Xu" <herbert@...dor.apana.org.au>,
	linux1394-devel@...ts.sourceforge.net
Subject: Re: 2.6.18-rc5-mm1 + all hotfixes -- INFO: possible recursive
 locking detected

On Tue, 5 Sep 2006 10:37:51 -0700
"Miles Lane" <miles.lane@...il.com> wrote:

> ieee1394: Node changed: 0-01:1023 -> 0-00:1023
> ieee1394: Node changed: 0-02:1023 -> 0-01:1023
> ieee1394: Node suspended: ID:BUS[0-00:1023]  GUID[0080880002103eae]
> 
> =============================================
> [ INFO: possible recursive locking detected ]
> 2.6.18-rc5-mm1 #2
> ---------------------------------------------
> knodemgrd_0/2321 is trying to acquire lock:
>  (&s->rwsem){----}, at: [<f8958897>] nodemgr_probe_ne+0x311/0x38d [ieee1394]
> 
> but task is already holding lock:
>  (&s->rwsem){----}, at: [<f8959078>] nodemgr_host_thread+0x717/0x883 [ieee1394]
> 
> other info that might help us debug this:
> 2 locks held by knodemgrd_0/2321:
>  #0:  (nodemgr_serialize){--..}, at: [<c11e76cd>]
> mutex_lock_interruptible+0x1c/0x21
>  #1:  (&s->rwsem){----}, at: [<f8959078>]
> nodemgr_host_thread+0x717/0x883 [ieee1394]
> 
> stack backtrace:
>  [<c1003c97>] dump_trace+0x69/0x1b7
>  [<c1003dfa>] show_trace_log_lvl+0x15/0x28
>  [<c10040f5>] show_trace+0x16/0x19
>  [<c1004110>] dump_stack+0x18/0x1d
>  [<c102f1e1>] __lock_acquire+0x7a2/0x9f8
>  [<c102f70a>] lock_acquire+0x56/0x74
>  [<c102b805>] down_write+0x27/0x41
>  [<f8958897>] nodemgr_probe_ne+0x311/0x38d [ieee1394]
>  [<f8959098>] nodemgr_host_thread+0x737/0x883 [ieee1394]
>  [<c1028c19>] kthread+0xaf/0xde
>  [<c100397b>] kernel_thread_helper+0x7/0x10
> DWARF2 unwinder stuck at kernel_thread_helper+0x7/0x10
> 
> Leftover inexact backtrace:
> 
>  [<c1003dfa>] show_trace_log_lvl+0x15/0x28
>  [<c10040f5>] show_trace+0x16/0x19
>  [<c1004110>] dump_stack+0x18/0x1d
>  [<c102f1e1>] __lock_acquire+0x7a2/0x9f8
>  [<c102f70a>] lock_acquire+0x56/0x74
>  [<c102b805>] down_write+0x27/0x41
>  [<f8958897>] nodemgr_probe_ne+0x311/0x38d [ieee1394]
>  [<f8959098>] nodemgr_host_thread+0x737/0x883 [ieee1394]
>  [<c1028c19>] kthread+0xaf/0xde
>  [<c100397b>] kernel_thread_helper+0x7/0x10
>  =======================
> ieee1394: Node resumed: ID:BUS[0-00:1023]  GUID[0080880002103eae]
> ieee1394: Node changed: 0-00:1023 -> 0-01:1023
> ieee1394: Node changed: 0-01:1023 -> 0-02:1023

That's a 1394 glitch, possibly introduced by git-ieee1394.patch.

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