From: Sander Eikelenboom <linux@eikelenboom.it>
To: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Hans Verkuil <hverkuil@xs4all.nl>,
Mauro Carvalho Chehab <mchehab@redhat.com>
Subject: [media] cx25821 regression from 3.9: BUG: bad unlock balance detected!
Date: Thu, 16 May 2013 19:41:42 +0200 [thread overview]
Message-ID: <1139404719.20130516194142@eikelenboom.it> (raw)
Hi Hans / Mauro,
With 3.10.0-rc1 (including the cx25821 changes from Hans), I get the bug below which wasn't present with 3.9.
--
Sander
[ 53.004968] =====================================
[ 53.004968] [ BUG: bad unlock balance detected! ]
[ 53.004968] 3.10.0-rc1-20130516-jens+ #1 Not tainted
[ 53.004968] -------------------------------------
[ 53.004968] motion/3328 is trying to release lock (&dev->lock) at:
[ 53.004968] [<ffffffff819be5f9>] mutex_unlock+0x9/0x10
[ 53.004968] but there are no more locks to release!
[ 53.004968]
[ 53.004968] other info that might help us debug this:
[ 53.004968] 1 lock held by motion/3328:
[ 53.004968] #0: (&mm->mmap_sem){++++++}, at: [<ffffffff81156cae>] vm_munmap+0x3e/0x70
[ 53.004968]
[ 53.004968] stack backtrace:
[ 53.004968] CPU: 1 PID: 3328 Comm: motion Not tainted 3.10.0-rc1-20130516-jens+ #1
[ 53.004968] Hardware name: Xen HVM domU, BIOS 4.3-unstable 05/16/2013
[ 53.004968] ffffffff819be5f9 ffff88002ac35c58 ffffffff819b9029 ffff88002ac35c88
[ 53.004968] ffffffff810e615e ffff88002ac35cb8 ffff88002b7c18a8 ffffffff819be5f9
[ 53.004968] 00000000ffffffff ffff88002ac35d28 ffffffff810eb17e ffffffff810e7ba5
[ 53.004968] Call Trace:
[ 53.004968] [<ffffffff819be5f9>] ? mutex_unlock+0x9/0x10
[ 53.004968] [<ffffffff819b9029>] dump_stack+0x19/0x1b
[ 53.004968] [<ffffffff810e615e>] print_unlock_imbalance_bug+0xfe/0x110
[ 53.004968] [<ffffffff819be5f9>] ? mutex_unlock+0x9/0x10
[ 53.004968] [<ffffffff810eb17e>] lock_release_non_nested+0x1ce/0x320
[ 53.004968] [<ffffffff810e7ba5>] ? debug_check_no_locks_freed+0x105/0x1b0
[ 53.353529] [<ffffffff819be5f9>] ? mutex_unlock+0x9/0x10
[ 53.353529] [<ffffffff810eb3cc>] lock_release+0xfc/0x250
[ 53.353529] [<ffffffff819be4b2>] __mutex_unlock_slowpath+0xb2/0x1f0
[ 53.353529] [<ffffffff819be5f9>] mutex_unlock+0x9/0x10
[ 53.353529] [<ffffffff81711105>] videobuf_waiton+0x55/0x230
[ 53.353529] [<ffffffff8114d052>] ? tlb_finish_mmu+0x32/0x50
[ 53.353529] [<ffffffff81154a46>] ? unmap_region+0xc6/0x100
[ 53.353529] [<ffffffff81172e05>] ? kmem_cache_free+0x195/0x230
[ 53.353529] [<ffffffff8172d3d9>] cx25821_free_buffer+0x49/0xa0
[ 53.353529] [<ffffffff8172f939>] cx25821_buffer_release+0x9/0x10
[ 53.353529] [<ffffffff81712c35>] videobuf_vm_close+0xc5/0x160
[ 53.353529] [<ffffffff81154aa5>] remove_vma+0x25/0x60
[ 53.353529] [<ffffffff81156b67>] do_munmap+0x307/0x410
[ 53.353529] [<ffffffff81156cbc>] vm_munmap+0x4c/0x70
[ 53.353529] [<ffffffff81157c09>] SyS_munmap+0x9/0x10
[ 53.353529] [<ffffffff819c20a9>] system_call_fastpath+0x16/0x1b
next reply other threads:[~2013-05-16 17:49 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-16 17:41 Sander Eikelenboom [this message]
2013-05-17 8:25 ` [media] cx25821 regression from 3.9: BUG: bad unlock balance detected! Hans Verkuil
2013-05-17 9:04 ` Sander Eikelenboom
2013-05-17 9:52 ` Hans Verkuil
2013-05-17 15:52 ` Sander Eikelenboom
2013-07-12 20:56 ` Sander Eikelenboom
2013-07-14 9:41 ` Hans Verkuil
2013-07-14 21:18 ` Sander Eikelenboom
2013-07-14 21:39 ` Hans Verkuil
2013-07-14 22:44 ` Devin Heitmueller
2013-07-14 22:56 ` Hans Verkuil
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