Moin,
I got this on 3.11-rc1+ when halting the box:
[ 883.476242] ------------[ cut here ]------------
[ 883.480927] WARNING: CPU: 3 PID: 2701 at drivers/gpu/drm/nouveau/nouveau_gem.c:54 nouveau_gem_object_del+0xa8/0xc0()
[ 883.491545] Modules linked in: ntfs msdos dm_mod ext2 vfat fat loop fuse usbhid snd_hda_codec_hdmi x86_pkg_temp_thermal coretemp kvm_intel kvm snd_hda_codec_realtek snd_hda_intel snd_hda_codec crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel ehci_pci xhci_hcd iTCO_wdt acpi_cpufreq snd_hwdep aesni_intel ehci_hcd aes_x86_64 mperf glue_helper button snd_pcm i2c_i801 iTCO_vendor_support snd_page_alloc usbcore dcdbas lrw gf128mul processor snd_timer pcspkr sb_edac ablk_helper evdev edac_core usb_common lpc_ich cryptd snd mfd_core soundcore microcode
[ 883.542505] CPU: 3 PID: 2701 Comm: Xorg Not tainted 3.11.0-rc1+ #4
[ 883.548746] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
[ 883.556214] 0000000000000009 ffff88043b087ca0 ffffffff815fc47d 0000000000000000
[ 883.563735] ffff88043b087cd8 ffffffff81047e6c ffff8804302a8800 ffff88043c2cc600
[ 883.571252] ffff88043d6da000 0000000000000009 ffff88043b087d70 ffff88043b087ce8
[ 883.578780] Call Trace:
[ 883.581265] [<ffffffff815fc47d>] dump_stack+0x54/0x74
[ 883.586463] [<ffffffff81047e6c>] warn_slowpath_common+0x8c/0xc0
[ 883.592523] [<ffffffff81047eba>] warn_slowpath_null+0x1a/0x20
[ 883.598408] [<ffffffff813e6e58>] nouveau_gem_object_del+0xa8/0xc0
[ 883.604657] [<ffffffff8135cd5a>] drm_gem_object_free+0x2a/0x30
[ 883.610630] [<ffffffff8135d008>] drm_gem_object_release_handle+0xa8/0xd0
[ 883.617497] [<ffffffff812947e6>] idr_for_each+0xb6/0x110
[ 883.622952] [<ffffffff8135cf60>] ? drm_gem_vm_close+0x80/0x80
[ 883.628851] [<ffffffff81600ede>] ? mutex_unlock+0xe/0x10
[ 883.634304] [<ffffffff8135dc60>] drm_gem_release+0x20/0x30
[ 883.639933] [<ffffffff8135c01a>] drm_release+0x5ba/0x650
[ 883.645397] [<ffffffff8116271f>] __fput+0xff/0x250
[ 883.650317] [<ffffffff811628be>] ____fput+0xe/0x10
[ 883.655244] [<ffffffff8106c6b5>] task_work_run+0xb5/0xe0
[ 883.660706] [<ffffffff8104da93>] do_exit+0x2b3/0xa40
[ 883.665808] [<ffffffff816049c9>] ? retint_swapgs+0xe/0x13
[ 883.671343] [<ffffffff8104e349>] do_group_exit+0x49/0xc0
[ 883.676803] [<ffffffff8104e3d7>] SyS_exit_group+0x17/0x20
[ 883.682351] [<ffffffff8160d1c6>] system_call_fastpath+0x1a/0x1f
[ 883.688418] ---[ end trace 9e774929633864b2 ]---
[ 883.693096]
[ 883.694609] ======================================================
[ 883.700852] [ INFO: possible circular locking dependency detected ]
[ 883.707204] 3.11.0-rc1+ #4 Tainted: G W
[ 883.711955] -------------------------------------------------------
[ 883.718292] Xorg/2701 is trying to acquire lock:
[ 883.722969] (reservation_ww_class_mutex){+.+.+.}, at: [<ffffffff813e4cfc>] nouveau_bo_unpin+0x3c/0x120
[ 883.732548]
[ 883.732548] but task is already holding lock:
[ 883.738446] (&dev->struct_mutex){+.+.+.}, at: [<ffffffff8135cfda>] drm_gem_object_release_handle+0x7a/0xd0
[ 883.748387]
[ 883.748387] which lock already depends on the new lock.
[ 883.748387]
[ 883.756649]
[ 883.756649] the existing dependency chain (in reverse order) is:
[ 883.764211]
-> #1 (&dev->struct_mutex){+.+.+.}:
[ 883.769051] [<ffffffff810a61ea>] lock_acquire+0x8a/0x120
[ 883.775066] [<ffffffff815ff485>] mutex_lock_nested+0x75/0x380
[ 883.781516] [<ffffffff813e6cae>] validate_fini_list.isra.7+0xde/0x130
[ 883.788662] [<ffffffff813e6d20>] validate_fini_no_ticket+0x20/0x50
[ 883.795555] [<ffffffff813e6d62>] validate_fini+0x12/0x50
[ 883.801566] [<ffffffff813e7862>] nouveau_gem_ioctl_pushbuf+0x3a2/0x16a0
[ 883.808887] [<ffffffff8135b589>] drm_ioctl+0x559/0x690
[ 883.814721] [<ffffffff81172bf7>] do_vfs_ioctl+0x97/0x590
[ 883.820737] [<ffffffff81173140>] SyS_ioctl+0x50/0x90
[ 883.826382] [<ffffffff8160d1c6>] system_call_fastpath+0x1a/0x1f
[ 883.832999]
-> #0 (reservation_ww_class_mutex){+.+.+.}:
[ 883.838523] [<ffffffff810a5b44>] __lock_acquire+0x1c54/0x1d40
[ 883.844963] [<ffffffff810a61ea>] lock_acquire+0x8a/0x120
[ 883.850965] [<ffffffff815ff485>] mutex_lock_nested+0x75/0x380
[ 883.857401] [<ffffffff813e4cfc>] nouveau_bo_unpin+0x3c/0x120
[ 883.864402] [<ffffffff813e6e45>] nouveau_gem_object_del+0x95/0xc0
[ 883.871831] [<ffffffff8135cd5a>] drm_gem_object_free+0x2a/0x30
[ 883.878998] [<ffffffff8135d008>] drm_gem_object_release_handle+0xa8/0xd0
[ 883.887030] [<ffffffff812947e6>] idr_for_each+0xb6/0x110
[ 883.893659] [<ffffffff8135dc60>] drm_gem_release+0x20/0x30
[ 883.900456] [<ffffffff8135c01a>] drm_release+0x5ba/0x650
[ 883.907060] [<ffffffff8116271f>] __fput+0xff/0x250
[ 883.913113] [<ffffffff811628be>] ____fput+0xe/0x10
[ 883.919163] [<ffffffff8106c6b5>] task_work_run+0xb5/0xe0
[ 883.925738] [<ffffffff8104da93>] do_exit+0x2b3/0xa40
[ 883.931959] [<ffffffff8104e349>] do_group_exit+0x49/0xc0
[ 883.938520] [<ffffffff8104e3d7>] SyS_exit_group+0x17/0x20
[ 883.945170] [<ffffffff8160d1c6>] system_call_fastpath+0x1a/0x1f
[ 883.952349]
[ 883.952349] other info that might help us debug this:
[ 883.952349]
[ 883.962128] Possible unsafe locking scenario:
[ 883.962128]
[ 883.969252] CPU0 CPU1
[ 883.974396] ---- ----
[ 883.979532] lock(&dev->struct_mutex);
[ 883.984013] lock(reservation_ww_class_mutex);
[ 883.991723] lock(&dev->struct_mutex);
[ 883.998725] lock(reservation_ww_class_mutex);
[ 884.003888]
[ 884.003888] *** DEADLOCK ***
[ 884.003888]
[ 884.011525] 2 locks held by Xorg/2701:
[ 884.015875] #0: (drm_global_mutex){+.+.+.}, at: [<ffffffff8135ba99>] drm_release+0x39/0x650
[ 884.025136] #1: (&dev->struct_mutex){+.+.+.}, at: [<ffffffff8135cfda>] drm_gem_object_release_handle+0x7a/0xd0
[ 884.036057]
[ 884.036057] stack backtrace:
[ 884.041589] CPU: 7 PID: 2701 Comm: Xorg Tainted: G W 3.11.0-rc1+ #4
[ 884.049362] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A08 01/24/2013
[ 884.057400] ffffffff822efb50 ffff88043b087ab8 ffffffff815fc47d ffffffff822efb50
[ 884.065501] ffff88043b087af8 ffffffff815f90aa ffff88043b087b80 ffff8804399e8600
[ 884.073609] ffff8804399e85d8 0000000000000001 0000000000000002 ffff8804399e8000
[ 884.081717] Call Trace:
[ 884.084768] [<ffffffff815fc47d>] dump_stack+0x54/0x74
[ 884.090543] [<ffffffff815f90aa>] print_circular_bug+0x1f9/0x208
[ 884.097187] [<ffffffff810a5b44>] __lock_acquire+0x1c54/0x1d40
[ 884.103652] [<ffffffff8160447c>] ? _raw_spin_unlock_irq+0x2c/0x40
[ 884.110466] [<ffffffff810a6c8d>] ? trace_hardirqs_on_caller+0x10d/0x1d0
[ 884.117809] [<ffffffff8107a655>] ? finish_task_switch+0x85/0x120
[ 884.124529] [<ffffffff810a61ea>] lock_acquire+0x8a/0x120
[ 884.130541] [<ffffffff813e4cfc>] ? nouveau_bo_unpin+0x3c/0x120
[ 884.137079] [<ffffffff815ff485>] mutex_lock_nested+0x75/0x380
[ 884.143530] [<ffffffff813e4cfc>] ? nouveau_bo_unpin+0x3c/0x120
[ 884.150067] [<ffffffff813e4cfc>] nouveau_bo_unpin+0x3c/0x120
[ 884.156418] [<ffffffff813e6e45>] nouveau_gem_object_del+0x95/0xc0
[ 884.163210] [<ffffffff8135cd5a>] drm_gem_object_free+0x2a/0x30
[ 884.169743] [<ffffffff8135d008>] drm_gem_object_release_handle+0xa8/0xd0
[ 884.177149] [<ffffffff812947e6>] idr_for_each+0xb6/0x110
[ 884.183155] [<ffffffff8135cf60>] ? drm_gem_vm_close+0x80/0x80
[ 884.189607] [<ffffffff81600ede>] ? mutex_unlock+0xe/0x10
[ 884.195622] [<ffffffff8135dc60>] drm_gem_release+0x20/0x30
[ 884.201815] [<ffffffff8135c01a>] drm_release+0x5ba/0x650
[ 884.207827] [<ffffffff8116271f>] __fput+0xff/0x250
[ 884.213316] [<ffffffff811628be>] ____fput+0xe/0x10
[ 884.218799] [<ffffffff8106c6b5>] task_work_run+0xb5/0xe0
[ 884.224810] [<ffffffff8104da93>] do_exit+0x2b3/0xa40
[ 884.230470] [<ffffffff816049c9>] ? retint_swapgs+0xe/0x13
[ 884.236571] [<ffffffff8104e349>] do_group_exit+0x49/0xc0
[ 884.242582] [<ffffffff8104e3d7>] SyS_exit_group+0x17/0x20
[ 884.248688] [<ffffffff8160d1c6>] system_call_fastpath+0x1a/0x1f
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
--
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