linux-kernel - irda rmmod lockdep trace.

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Message-ID: <20070308225436.GA25184@redhat.com>
Date:	Thu, 8 Mar 2007 17:54:36 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	samuel@...tiz.org
Subject: irda rmmod lockdep trace.

modprobe irda ; rmmod irda in 2.6.21rc3 gets me the spew below..

	Dave

NET: Registered protocol family 23
NET: Unregistered protocol family 23

=============================================
[ INFO: possible recursive locking detected ]
2.6.20-1.2966.fc7 #1
---------------------------------------------
rmmod/16712 is trying to acquire lock:
 (&hashbin->hb_spinlock){....}, at: [<ffffffff884bf476>] hashbin_delete+0x29/0x94 [irda]

but task is already holding lock:
 (&hashbin->hb_spinlock){....}, at: [<ffffffff884bf476>] hashbin_delete+0x29/0x94 [irda]

other info that might help us debug this:
1 lock held by rmmod/16712:
 #0:  (&hashbin->hb_spinlock){....}, at: [<ffffffff884bf476>] hashbin_delete+0x29/0x94 [irda]

stack backtrace:

Call Trace:
 [<ffffffff802a303b>] __lock_acquire+0x151/0xbc4
 [<ffffffff884c1517>] :irda:__irias_delete_attrib+0x0/0x31
 [<ffffffff802a3ea4>] lock_acquire+0x4c/0x65
 [<ffffffff884bf476>] :irda:hashbin_delete+0x29/0x94
 [<ffffffff80264011>] _spin_lock_irqsave+0x2c/0x3c
 [<ffffffff884bf476>] :irda:hashbin_delete+0x29/0x94
 [<ffffffff884c1918>] :irda:__irias_delete_object+0x0/0x39
 [<ffffffff884c193d>] :irda:__irias_delete_object+0x25/0x39
 [<ffffffff884bf48d>] :irda:hashbin_delete+0x40/0x94
 [<ffffffff884c5e3a>] :irda:iriap_cleanup+0x36/0x38
 [<ffffffff884c5fd6>] :irda:irda_cleanup+0x29/0x3a
 [<ffffffff802aa1e1>] sys_delete_module+0x199/0x1ca
 [<ffffffff8026ce36>] syscall_trace_enter+0x9a/0x9f
 [<ffffffff8025c2b5>] tracesys+0xdc/0xe1


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