Additional info:
reporter:       libreport-2.1.6
[ INFO: possible recursive locking detected ]
3.11.0-0.rc7.git4.1.fc21.x86_64 #1 Not tainted
---------------------------------------------
Xorg/4640 is trying to acquire lock:
 (reservation_ww_class_mutex){+.+.+.}, at: [<ffffffffa009af08>] qxl_surface_id_alloc+0x278/0x4d0 [qxl]
but task is already holding lock:
 (reservation_ww_class_mutex){+.+.+.}, at: [<ffffffffa0086016>] ttm_eu_reserve_buffers+0x146/0x4c0 [ttm]
other info that might help us debug this:
 Possible unsafe locking scenario:
       CPU0
       ----
  lock(reservation_ww_class_mutex);
  lock(reservation_ww_class_mutex);
 *** DEADLOCK ***
 May be due to missing lock nesting notation
3 locks held by Xorg/4640:
 #0:  (reservation_ww_class_acquire){+.+.+.}, at: [<ffffffffa009d7ec>] qxl_release_reserve_list+0x3c/0xe0 [qxl]
 #1:  (reservation_ww_class_mutex){+.+.+.}, at: [<ffffffffa0086016>] ttm_eu_reserve_buffers+0x146/0x4c0 [ttm]
 #2:  (&qdev->surf_evict_mutex){+.+.+.}, at: [<ffffffffa009ad50>] qxl_surface_id_alloc+0xc0/0x4d0 [qxl]
stack backtrace:
CPU: 1 PID: 4640 Comm: Xorg Not tainted 3.11.0-0.rc7.git4.1.fc21.x86_64 #1
Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
 ffff880055bc8000 ffff880039d97a80 ffffffff817221a6 ffffffff825bf140
 ffff880039d97b40 ffffffff810e8b2f 0000000000000001 ffff880039d97ac0
 ffffffff810b7878 0000000000000000 00016e8b385ec2ce ffffffff82217500
Call Trace:
 [<ffffffff817221a6>] dump_stack+0x54/0x74
 [<ffffffff810e8b2f>] __lock_acquire+0x1a0f/0x1b20
 [<ffffffff810b7878>] ? sched_clock_cpu+0xa8/0x100
 [<ffffffff810e9432>] lock_acquire+0xa2/0x1f0
 [<ffffffffa009af08>] ? qxl_surface_id_alloc+0x278/0x4d0 [qxl]
 [<ffffffff81725957>] mutex_lock_interruptible_nested+0x87/0x460
 [<ffffffffa009af08>] ? qxl_surface_id_alloc+0x278/0x4d0 [qxl]
 [<ffffffffa009af08>] ? qxl_surface_id_alloc+0x278/0x4d0 [qxl]
 [<ffffffffa009af08>] qxl_surface_id_alloc+0x278/0x4d0 [qxl]
 [<ffffffffa0099482>] qxl_bo_check_id+0x32/0x50 [qxl]
 [<ffffffffa009d84c>] qxl_release_reserve_list+0x9c/0xe0 [qxl]
 [<ffffffffa009cf24>] qxl_execbuffer_ioctl+0x284/0x730 [qxl]
 [<ffffffffa00253a2>] drm_ioctl+0x542/0x680 [drm]
 [<ffffffff81305256>] ? inode_has_perm.isra.49.constprop.65+0x56/0x80
 [<ffffffff812046b5>] do_vfs_ioctl+0x305/0x530
 [<ffffffff813056eb>] ? selinux_file_ioctl+0x5b/0x110
 [<ffffffff81204961>] SyS_ioctl+0x81/0xa0
 [<ffffffff81735099>] system_call_fastpath+0x16/0x1b