From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 84041] New: I built my kernel with lockdep, and caught a
possible deadlock while playing video using vdpau on radeon driver.
Date: Sun, 07 Sep 2014 17:47:15 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=84041
Bug ID: 84041
Summary: I built my kernel with lockdep, and caught a possible
deadlock while playing video using vdpau on radeon
driver.
Product: Drivers
Version: 2.5
Kernel Version: Possible deadlock when using dri PRIME
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - non Intel)
Assignee: drivers_video-dri@kernel-bugs.osdl.org
Reporter: yshuiv7@gmail.com
Regression: No
dmesg:
[ 166.768423] =============================================
[ 166.768424] [ INFO: possible recursive locking detected ]
[ 166.768429] 3.16.1 #7 Not tainted
[ 166.768430] ---------------------------------------------
[ 166.768432] Xorg.bin/319 is trying to acquire lock:
[ 166.768435] (&dev->struct_mutex){+.+.+.}, at: []
i915_gem_unmap_dma_buf+0x33/0xd0
[ 166.768461]
but task is already holding lock:
[ 166.768462] (&dev->struct_mutex){+.+.+.}, at: []
drm_gem_object_handle_unreference_unlocked+0x102/0x130
[ 166.768475]
other info that might help us debug this:
[ 166.768477] Possible unsafe locking scenario:
[ 166.768479] CPU0
[ 166.768480] ----
[ 166.768481] lock(&dev->struct_mutex);
[ 166.768483] lock(&dev->struct_mutex);
[ 166.768484]
*** DEADLOCK ***
[ 166.768486] May be due to missing lock nesting notation
[ 166.768488] 1 lock held by Xorg.bin/319:
[ 166.768489] #0: (&dev->struct_mutex){+.+.+.}, at: []
drm_gem_object_handle_unreference_unlocked+0x102/0x130
[ 166.768493]
stack backtrace:
[ 166.768496] CPU: 0 PID: 319 Comm: Xorg.bin Not tainted 3.16.1-zen-v7+ #7
[ 166.768499] Hardware name: LENOVO 20347/Lenovo Y40-70, BIOS 99CN24WW(V1.07)
07/28/2014
[ 166.768500] ffffffff825f02c0 ffff880098dcfae0 ffffffff8174e942
ffff88024f065fa0
[ 166.768504] ffff880098dcfbb0 ffffffff810ca996 ffff8802553b8e88
00000000fffff200
[ 166.768506] ffff880098dcfb20 ffffffff810c8abd ffff8802553b8ea8
ffff88024f066878
[ 166.768510] Call Trace:
[ 166.768520] [] dump_stack+0x4d/0x6f
[ 166.768528] [] __lock_acquire+0x1b06/0x1fa0
[ 166.768531] [] ? trace_hardirqs_on_caller+0x15d/0x200
[ 166.768534] [] lock_acquire+0x95/0x130
[ 166.768537] [] ? i915_gem_unmap_dma_buf+0x33/0xd0
[ 166.768542] [] mutex_lock_nested+0x63/0x410
[ 166.768544] [] ? i915_gem_unmap_dma_buf+0x33/0xd0
[ 166.768546] [] ? mark_held_locks+0x75/0xa0
[ 166.768549] [] i915_gem_unmap_dma_buf+0x33/0xd0
[ 166.768556] [] dma_buf_unmap_attachment+0x4c/0x70
[ 166.768564] [] drm_prime_gem_destroy+0x22/0x40
[ 166.768662] [] radeon_gem_object_free+0x33/0x40 [radeon]
[ 166.768665] [] drm_gem_object_free+0x27/0x40
[ 166.768667] []
drm_gem_object_handle_unreference_unlocked+0x120/0x130
[ 166.768671] [] drm_gem_handle_delete+0xba/0x110
[ 166.768674] [] drm_gem_close_ioctl+0x25/0x30
[ 166.768676] [] drm_ioctl+0x197/0x680
[ 166.768680] [] ? _raw_spin_unlock_irqrestore+0x55/0x70
[ 166.768682] [] ? trace_hardirqs_on_caller+0x15d/0x200
[ 166.768684] [] ? trace_hardirqs_on+0xd/0x10
[ 166.768703] [] radeon_drm_ioctl+0x4c/0x80 [radeon]
[ 166.768708] [] do_vfs_ioctl+0x2f0/0x4f0
[ 166.768710] [] ? __fget+0xac/0xf0
[ 166.768712] [] ? __fget+0x5/0xf0
[ 166.768714] [] SyS_ioctl+0x41/0x80
[ 166.768717] [] tracesys+0xd4/0xd9
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