linux-kernel - Re: 2.6.26-rc2-mm1: sparc64 - possible recursive locking detected

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Message-Id: <200805142050.13600.m.kozlowski@tuxland.pl>
Date:	Wed, 14 May 2008 20:50:13 +0200
From:	Mariusz Kozlowski <m.kozlowski@...land.pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, davem@...emloft.net,
	kernel-testers@...r.kernel.org
Subject: Re: 2.6.26-rc2-mm1: sparc64 - possible recursive locking detected

Hello,

> > 	Got this on sparc64 startup:
> 
> whoa.  A sparc64 tester?  Thanks!

again - thanks for linux 8-)
 
> > =============================================
> > [ INFO: possible recursive locking detected ]
> > 2.6.26-rc2-mm1 #2
> > ---------------------------------------------
> > modprobe/514 is trying to acquire lock:
> >  (&cls->mutex){--..}, at: [<00000000005ff538>] device_add+0x3c0/0x5c0
> > 
> > but task is already holding lock:
> >  (&cls->mutex){--..}, at: [<000000000060287c>] class_interface_register+0x44/0xe0
> > 
> > other info that might help us debug this:
> > 1 lock held by modprobe/514:
> >  #0:  (&cls->mutex){--..}, at: [<000000000060287c>] class_interface_register+0x44/0xe0
> > 
> > stack backtrace:
> > Call Trace:
> >  [000000000048cc64] __lock_acquire+0x104c/0x1400
> >  [000000000048d098] lock_acquire+0x80/0xa0
> >  [0000000000701898] mutex_lock_nested+0xc0/0x4e0
> >  [00000000005ff538] device_add+0x3c0/0x5c0
> >  [00000000005ff74c] device_register+0x14/0x20
> >  [00000000005ff808] device_create+0xb0/0xe0
> >  [0000000010012ef8] sg_add+0x160/0x380 [sg]
> >  [00000000006028d4] class_interface_register+0x9c/0xe0
> >  [0000000000617050] scsi_register_interface+0x18/0x40
> >  [000000001001c0a4] init_sg+0xac/0x180 [sg]
> >  [00000000004960c8] sys_init_module+0xb0/0x1c0
> >  [00000000004463cc] sys32_init_module+0x14/0x20
> >  [0000000000406294] linux_sparc_syscall32+0x3c/0x40
> >  [0000000000013698] 0x136a0
> > 
> 
> Yeah, this is a bug which has always been there, afaik.  A
> semaphore was converted to a mutex.  Semaphores don't have lockdep
> checking, but mutexes do, so we just now got to find out about it. 
> Some finger-pointing is occurring over on the scsi list ;)
>
> I assume the machine otherwise works OK?

Yes - seems it's running fine. I'm doing some other tests now so if anything pops out
you'll know it.

	Mariusz
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