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

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Date:	Wed, 14 May 2008 20:29:40 +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:

=============================================
[ 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

Download attachment "config-sparc64-2.6.26-rc2-mm1.gz" of type "application/x-gzip" (6242 bytes)