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Subject[nouveau] WARNING: possible circular locking dependency detected in linux-next
I've been seeing these warnings for a couple of weeks now. Any
pointers on how to address this would be much appreciated.

[ 57.207457] ======================================================
[ 57.207470] WARNING: possible circular locking dependency detected
[ 57.207483] 5.11.0-rc7-next-20210209 #142 Tainted: G W
[ 57.207497] ------------------------------------------------------
[ 57.207508] Xorg/459 is trying to acquire lock:
[ 57.207521] ffff888016edc518 (&cli->mutex){+.+.}-{3:3}, at:
nouveau_bo_move+0x4bf/0x2ec0 [nouveau]
--------------------------------------------------------
[faddr2line]
nouveau_bo_move+0x4bf/0x2ec0:
nouveau_bo_move_m2mf at
/home/sasha/linux-next/drivers/gpu/drm/nouveau/nouveau_bo.c:804
(inlined by) nouveau_bo_move at
/home/sasha/linux-next/drivers/gpu/drm/nouveau/nouveau_bo.c:1024

/home/sasha/linux-next/drivers/gpu/drm/nouveau/nouveau_bo.c:800,804
if (drm_drv_uses_atomic_modeset(drm->dev))
mutex_lock(&cli->mutex);
else
mutex_lock_nested(&cli->mutex, SINGLE_DEPTH_NESTING);
ret = nouveau_fence_sync(nouveau_bo(bo), chan, true, ctx->interruptible);
--------------------------------------------------------
[ 57.207923]
but task is already holding lock:
[ 57.207934] ffff88801f49e9a0
(reservation_ww_class_mutex){+.+.}-{3:3}, at:
nouveau_bo_pin+0xc1/0xb60 [nouveau]
--------------------------------------------------------
[faddr2line]
nouveau_bo_pin+0xc1/0xb60:
ttm_bo_reserve at /home/sasha/linux-next/./include/drm/ttm/ttm_bo_driver.h:152
(inlined by) nouveau_bo_pin at
/home/sasha/linux-next/drivers/gpu/drm/nouveau/nouveau_bo.c:424

/home/sasha/linux-next/include/drm/ttm/ttm_bo_driver.h:148,154
if (interruptible)
ret = dma_resv_lock_interruptible(bo->base.resv, ticket);
else
ret = dma_resv_lock(bo->base.resv, ticket);
if (ret == -EINTR)
return -ERESTARTSYS;
return ret;
--------------------------------------------------------
[ 57.208317]
which lock already depends on the new lock.

[ 57.208329]
the existing dependency chain (in reverse order) is:
[ 57.208340]
-> #1 (reservation_ww_class_mutex){+.+.}-{3:3}:
[ 57.208373] __ww_mutex_lock.constprop.0+0x18a/0x2d40
[ 57.208395] nouveau_bo_pin+0xc1/0xb60 [nouveau]
[ 57.208753] nouveau_channel_prep+0x2c6/0xba0 [nouveau]
[ 57.209105] nouveau_channel_new+0x127/0x2020 [nouveau]
[ 57.209457] nouveau_abi16_ioctl_channel_alloc+0x33b/0xdf0 [nouveau]
[ 57.209809] drm_ioctl_kernel+0x1cb/0x260
[ 57.209826] drm_ioctl+0x420/0x850
[ 57.209841] nouveau_drm_ioctl+0xdf/0x210 [nouveau]
[ 57.210198] __x64_sys_ioctl+0x122/0x190
[ 57.210214] do_syscall_64+0x33/0x40
[ 57.210230] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 57.210247]
-> #0 (&cli->mutex){+.+.}-{3:3}:
[ 57.210280] __lock_acquire+0x2a01/0x5ab0
[ 57.210298] lock_acquire+0x1a9/0x690
[ 57.210314] __mutex_lock+0x125/0x1140
[ 57.210329] nouveau_bo_move+0x4bf/0x2ec0 [nouveau]
[ 57.210686] ttm_bo_handle_move_mem+0x1b6/0x570 [ttm]
[ 57.210719] ttm_bo_validate+0x316/0x420 [ttm]
[ 57.210750] nouveau_bo_pin+0x3c4/0xb60 [nouveau]
[ 57.211107] nv50_wndw_prepare_fb+0x117/0xcb0 [nouveau]
[ 57.211460] drm_atomic_helper_prepare_planes+0x1ec/0x600
[ 57.211477] nv50_disp_atomic_commit+0x189/0x530 [nouveau]
[ 57.211833] drm_atomic_helper_update_plane+0x2ac/0x380
[ 57.211849] drm_mode_cursor_universal+0x3f3/0xb40
[ 57.211865] drm_mode_cursor_common+0x27b/0x930
[ 57.211880] drm_mode_cursor_ioctl+0x95/0xd0
[ 57.211895] drm_ioctl_kernel+0x1cb/0x260
[ 57.211910] drm_ioctl+0x420/0x850
[ 57.211925] nouveau_drm_ioctl+0xdf/0x210 [nouveau]
[ 57.212281] __x64_sys_ioctl+0x122/0x190
[ 57.212297] do_syscall_64+0x33/0x40
[ 57.212312] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 57.212328]
other info that might help us debug this:

[ 57.212339] Possible unsafe locking scenario:

[ 57.212350] CPU0 CPU1
[ 57.212360] ---- ----
[ 57.212370] lock(reservation_ww_class_mutex);
[ 57.212390] lock(&cli->mutex);
[ 57.212410] lock(reservation_ww_class_mutex);
[ 57.212430] lock(&cli->mutex);
[ 57.212449]
*** DEADLOCK ***

[ 57.212460] 3 locks held by Xorg/459:
[ 57.212473] #0: ffffc9000044fb38
(crtc_ww_class_acquire){+.+.}-{0:0}, at:
drm_mode_cursor_common+0x1fd/0x930
[ 57.212520] #1: ffff88800d9f2098
(crtc_ww_class_mutex){+.+.}-{3:3}, at: modeset_lock+0xdb/0x4c0
[ 57.212564] #2: ffff88801f49e9a0
(reservation_ww_class_mutex){+.+.}-{3:3}, at:
nouveau_bo_pin+0xc1/0xb60 [nouveau]
[ 57.212949]
stack backtrace:
[ 57.212961] CPU: 0 PID: 459 Comm: Xorg Tainted: G W
5.11.0-rc7-next-20210209 #142
[ 57.212979] Hardware name: Gigabyte Technology Co., Ltd.
P35-S3G/P35-S3G, BIOS F4 07/10/2008
[ 57.212992] Call Trace:
[ 57.213007] dump_stack+0x9a/0xcc
[ 57.213029] check_noncircular+0x25f/0x2e0
[ 57.213049] ? print_circular_bug+0x460/0x460
[ 57.213075] ? alloc_chain_hlocks+0x1e4/0x530
[ 57.213095] __lock_acquire+0x2a01/0x5ab0
[ 57.213119] ? nvkm_ioctl+0x34a/0x6d0 [nouveau]
[ 57.213400] ? lockdep_hardirqs_on_prepare+0x3e0/0x3e0
[ 57.213421] ? memcpy+0x39/0x60
[ 57.213440] ? nvif_object_mthd+0x20e/0x250 [nouveau]
[ 57.213717] lock_acquire+0x1a9/0x690
[ 57.213736] ? nouveau_bo_move+0x4bf/0x2ec0 [nouveau]
[ 57.214097] ? lock_release+0x610/0x610
[ 57.214115] ? lockdep_hardirqs_on_prepare+0x3e0/0x3e0
[ 57.214134] ? memcpy+0x39/0x60
[ 57.214152] ? nvif_object_mthd+0x20e/0x250 [nouveau]
[ 57.214431] __mutex_lock+0x125/0x1140
[ 57.214448] ? nouveau_bo_move+0x4bf/0x2ec0 [nouveau]
[ 57.214808] ? nouveau_bo_move+0x4bf/0x2ec0 [nouveau]
[ 57.215167] ? ttm_bo_wait+0x88/0xc0 [ttm]
[ 57.215201] ? mutex_lock_io_nested+0xfe0/0xfe0
[ 57.215220] ? nouveau_mem_map+0x1d3/0x3b0 [nouveau]
[ 57.215579] ? nvif_vmm_put+0x140/0x140 [nouveau]
[ 57.215856] ? nouveau_gem_ioctl_info+0xb0/0xb0 [nouveau]
[ 57.216220] nouveau_bo_move+0x4bf/0x2ec0 [nouveau]
[ 57.216586] ? unmap_mapping_pages+0xca/0x240
[ 57.216605] ? spin_bug+0x100/0x100
[ 57.216621] ? do_wp_page+0xf20/0xf20
[ 57.216640] ? nouveau_bo_move_ntfy.constprop.0+0x620/0x620 [nouveau]
[ 57.217000] ? _raw_spin_unlock+0x1a/0x30
[ 57.217017] ? ttm_bo_add_move_fence.constprop.0+0x1a0/0x2a0 [ttm]
[ 57.217055] ttm_bo_handle_move_mem+0x1b6/0x570 [ttm]
[ 57.217092] ttm_bo_validate+0x316/0x420 [ttm]
[ 57.217127] ? ttm_bo_bounce_temp_buffer+0x1e0/0x1e0 [ttm]
[ 57.217162] ? lockdep_hardirqs_on_prepare+0x3e0/0x3e0
[ 57.217181] ? __mutex_unlock_slowpath+0xe2/0x610
[ 57.217203] ? nouveau_bo_placement_set+0xa6/0x420 [nouveau]
[ 57.217564] nouveau_bo_pin+0x3c4/0xb60 [nouveau]
[ 57.217927] ? nouveau_bo_sync_for_device+0x3c0/0x3c0 [nouveau]
[ 57.218289] ? find_held_lock+0x2d/0x110
[ 57.218309] nv50_wndw_prepare_fb+0x117/0xcb0 [nouveau]
[ 57.218669] ? nv50_wndw_destroy+0x200/0x200 [nouveau]
[ 57.219028] ? rcu_read_lock_sched_held+0x3a/0x70
[ 57.219047] ? module_assert_mutex_or_preempt+0x39/0x70
[ 57.219065] ? __module_address+0x30/0x310
[ 57.219086] drm_atomic_helper_prepare_planes+0x1ec/0x600
[ 57.219105] ? lockdep_init_map_type+0x2c3/0x770
[ 57.219126] nv50_disp_atomic_commit+0x189/0x530 [nouveau]
[ 57.219488] drm_atomic_helper_update_plane+0x2ac/0x380
[ 57.219510] drm_mode_cursor_universal+0x3f3/0xb40
[ 57.219533] ? setplane_internal+0x5f0/0x5f0
[ 57.219557] ? ww_mutex_lock_interruptible+0x2f/0x160
[ 57.219577] drm_mode_cursor_common+0x27b/0x930
[ 57.219598] ? lockdep_hardirqs_on_prepare+0x3e0/0x3e0
[ 57.219617] ? drm_mode_cursor_universal+0xb40/0xb40
[ 57.219642] ? find_held_lock+0x2d/0x110
[ 57.219661] ? drm_mode_setplane+0x850/0x850
[ 57.219677] drm_mode_cursor_ioctl+0x95/0xd0
[ 57.219694] ? drm_mode_setplane+0x850/0x850
[ 57.219711] ? lock_acquire+0x1a9/0x690
[ 57.219732] ? drm_is_current_master+0x65/0x120
[ 57.219750] drm_ioctl_kernel+0x1cb/0x260
[ 57.219767] ? drm_setversion+0x800/0x800
[ 57.219789] drm_ioctl+0x420/0x850
[ 57.219807] ? drm_mode_setplane+0x850/0x850
[ 57.219824] ? drm_version+0x390/0x390
[ 57.219841] ? __pm_runtime_resume+0x7a/0x100
[ 57.219862] ? do_user_addr_fault+0x25f/0xaf0
[ 57.219882] ? lockdep_hardirqs_on_prepare+0x273/0x3e0
[ 57.219900] ? _raw_spin_unlock_irqrestore+0x34/0x40
[ 57.219917] ? trace_hardirqs_on+0x32/0x120
[ 57.219940] nouveau_drm_ioctl+0xdf/0x210 [nouveau]
[ 57.220301] __x64_sys_ioctl+0x122/0x190
[ 57.220321] do_syscall_64+0x33/0x40
[ 57.220338] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 57.220356] RIP: 0033:0x7f4e52905f6b
[ 57.220374] Code: ff ff ff 85 c0 79 8b 49 c7 c4 ff ff ff ff 5b 5d
4c 89 e0 41 5c c3 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 10 00 00
00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d d5 ae 0c 00 f7 d8 64 89
01 48
[ 57.220392] RSP: 002b:00007fff974a0258 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[ 57.220413] RAX: ffffffffffffffda RBX: 00007fff974a0290 RCX: 00007f4e52905f6b
[ 57.220428] RDX: 00007fff974a0290 RSI: 00000000c01c64a3 RDI: 000000000000000a
[ 57.220442] RBP: 00000000c01c64a3 R08: 0000000000000040 R09: 0000000000000001
[ 57.220455] R10: 00007f4e52d761c0 R11: 0000000000000246 R12: 0000565035263610
[ 57.220469] R13: 000000000000000a R14: 0000000000000000 R15: 0000000000000209
[ 158.611112] perf: interrupt took too long (2503 > 2500), lowering
kernel.perf_event_max_sample_rate to 79000
[ 319.835187] perf: interrupt took too long (3138 > 3128), lowering
kernel.perf_event_max_sample_rate to 63000
[ 358.920047] nouveau 0000:01:00.0: Direct firmware load for
nouveau/nv84_xuc00f failed with error -2
[ 358.920095] nouveau 0000:01:00.0: vp: unable to load firmware
nouveau/nv84_xuc00f
[ 358.920107] nouveau 0000:01:00.0: vp: init failed, -2
[ 358.920523] nouveau 0000:01:00.0: Direct firmware load for
nouveau/nv84_xuc103 failed with error -2
[ 358.920556] nouveau 0000:01:00.0: bsp: unable to load firmware
nouveau/nv84_xuc103
[ 358.920565] nouveau 0000:01:00.0: bsp: init failed, -2

Thanks.
Alexander Kapshuk

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