Created attachment 296155 [details]
dmesg (kernel 5.12-rc5, A10-9700E)

[...]
======================================================
WARNING: possible circular locking dependency detected
5.12.0-rc5-Excavator #4 Not tainted
------------------------------------------------------
X/593 is trying to acquire lock:
ffff95f9110ec518 (&cli->mutex){+.+.}-{3:3}, at: nouveau_bo_move+0x167/0x990 [nouveau]

 but task is already holding lock:
ffff95f8e70281a0 (reservation_ww_class_mutex){+.+.}-{3:3}, at: nouveau_bo_pin+0x3b/0x3c0 [nouveau]

 which lock already depends on the new lock.

 the existing dependency chain (in reverse order) is:

 -> #1 (reservation_ww_class_mutex){+.+.}-{3:3}:
       __ww_mutex_lock.constprop.0+0x99/0xf20
       nouveau_bo_pin+0x3b/0x3c0 [nouveau]
       nouveau_channel_prep+0x126/0x2f0 [nouveau]
       nouveau_channel_new+0x5d/0x6b0 [nouveau]
       nouveau_abi16_ioctl_channel_alloc+0x10d/0x3a0 [nouveau]
       drm_ioctl_kernel+0xa8/0xf0 [drm]
       drm_ioctl+0x20a/0x3a0 [drm]
       nouveau_drm_ioctl+0x50/0xa0 [nouveau]
       __x64_sys_ioctl+0x81/0xa0
       do_syscall_64+0x33/0x40
       entry_SYSCALL_64_after_hwframe+0x44/0xae

 -> #0 (&cli->mutex){+.+.}-{3:3}:
       __lock_acquire+0x1480/0x2610
       lock_acquire+0xc4/0x390
       __mutex_lock+0x78/0x870
       nouveau_bo_move+0x167/0x990 [nouveau]
       ttm_bo_handle_move_mem+0x8b/0x170 [ttm]
       ttm_bo_validate+0x193/0x1f0 [ttm]
       nouveau_bo_pin+0x177/0x3c0 [nouveau]
       nv50_wndw_prepare_fb+0x5a/0x4c0 [nouveau]
       drm_atomic_helper_prepare_planes+0x85/0x110 [drm_kms_helper]
       nv50_disp_atomic_commit+0xa6/0x1d0 [nouveau]
       drm_atomic_helper_update_plane+0xe4/0x140 [drm_kms_helper]
       drm_mode_cursor_universal+0x126/0x230 [drm]
       drm_mode_cursor_common+0xfc/0x230 [drm]
       drm_mode_cursor_ioctl+0x46/0x60 [drm]
       drm_ioctl_kernel+0xa8/0xf0 [drm]
       drm_ioctl+0x20a/0x3a0 [drm]
       nouveau_drm_ioctl+0x50/0xa0 [nouveau]
       __x64_sys_ioctl+0x81/0xa0
       do_syscall_64+0x33/0x40
       entry_SYSCALL_64_after_hwframe+0x44/0xae

 other info that might help us debug this:
 Possible unsafe locking scenario:
       CPU0                    CPU1
       ----                    ----
  lock(reservation_ww_class_mutex);
                               lock(&cli->mutex);
                               lock(reservation_ww_class_mutex);
  lock(&cli->mutex);

  *** DEADLOCK ***
3 locks held by X/593:
 #0: ffffaae9888e7ce0 (crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_mode_cursor_common+0xbb/0x230 [drm]
 #1: ffff95f9113b0098 (crtc_ww_class_mutex){+.+.}-{3:3}, at: modeset_lock+0x5f/0x1c0 [drm]
 #2: ffff95f8e70281a0 (reservation_ww_class_mutex){+.+.}-{3:3}, at: nouveau_bo_pin+0x3b/0x3c0 [nouveau]

 stack backtrace:
CPU: 3 PID: 593 Comm: X Not tainted 5.12.0-rc5-Excavator #4
Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./A320M-HDV R3.0, BIOS P3.10 06/26/2019
Call Trace:
 dump_stack+0x7f/0xad
 check_noncircular+0x104/0x120
 ? nvkm_uvmm_mthd+0x778/0x7b0 [nouveau]
 __lock_acquire+0x1480/0x2610
 lock_acquire+0xc4/0x390
 ? nouveau_bo_move+0x167/0x990 [nouveau]
 ? nvif_object_mthd+0x112/0x130 [nouveau]
 __mutex_lock+0x78/0x870
 ? nouveau_bo_move+0x167/0x990 [nouveau]
 ? nouveau_bo_move+0x167/0x990 [nouveau]
 nouveau_bo_move+0x167/0x990 [nouveau]
 ? unmap_mapping_pages+0x59/0x120
 ttm_bo_handle_move_mem+0x8b/0x170 [ttm]
 ttm_bo_validate+0x193/0x1f0 [ttm]
 ? nouveau_bo_sync_for_device+0x9b/0xe0 [nouveau]
 nouveau_bo_pin+0x177/0x3c0 [nouveau]
 nv50_wndw_prepare_fb+0x5a/0x4c0 [nouveau]
 ? _raw_spin_unlock_irqrestore+0x42/0x50
 drm_atomic_helper_prepare_planes+0x85/0x110 [drm_kms_helper]
 ? lockdep_init_map_type+0x47/0x220
 nv50_disp_atomic_commit+0xa6/0x1d0 [nouveau]
 drm_atomic_helper_update_plane+0xe4/0x140 [drm_kms_helper]
 drm_mode_cursor_universal+0x126/0x230 [drm]
 drm_mode_cursor_common+0xfc/0x230 [drm]
 ? drm_mode_setplane+0x1a0/0x1a0 [drm]
 drm_mode_cursor_ioctl+0x46/0x60 [drm]
 drm_ioctl_kernel+0xa8/0xf0 [drm]
 drm_ioctl+0x20a/0x3a0 [drm]
 ? drm_mode_setplane+0x1a0/0x1a0 [drm]
 ? lockdep_hardirqs_on_prepare+0xd4/0x180
 ? _raw_spin_unlock_irqrestore+0x42/0x50
 nouveau_drm_ioctl+0x50/0xa0 [nouveau]
 __x64_sys_ioctl+0x81/0xa0
 do_syscall_64+0x33/0x40
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f0621dbecc7
Code: 3c 1c 48 f7 d8 49 39 c4 72 b9 e8 24 ff ff ff 85 c0 78 be 5b 4c 89 e0 5d 41 5c c3 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 71 41 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffd8eb88dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000000000c RCX: 00007f0621dbecc7
RDX: 00007ffd8eb88e1c RSI: 00000000c01c64a3 RDI: 000000000000000c
RBP: 00000000c01c64a3 R08: 0000000000000040 R09: 0000000000000001
R10: 00007f0622505bc0 R11: 0000000000000246 R12: 000055fbec3f5ec0
R13: 00007ffd8eb88e1c R14: 00000000000003bc R15: 0000000000000218


 # lspci -s 04:00.0 -v
04:00.0 VGA compatible controller: NVIDIA Corporation GK208B [GeForce GT 710] (rev a1) (prog-if 00 [VGA controller])
	Subsystem: ASUSTeK Computer Inc. GT710-4H-SL-2GD5
	Flags: bus master, fast devsel, latency 0, IRQ 51, IOMMU group 0
	Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
	Memory at e8000000 (64-bit, prefetchable) [size=128M]
	Memory at f0000000 (64-bit, prefetchable) [size=32M]
	I/O ports at e000 [size=128]
	Expansion ROM at 000c0000 [disabled] [size=128K]
	Capabilities: [60] Power Management version 3
	Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
	Capabilities: [78] Express Legacy Endpoint, MSI 00
	Capabilities: [100] Virtual Channel
	Capabilities: [128] Power Budgeting <?>
	Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
	Capabilities: [900] Secondary PCI Express
	Kernel driver in use: nouveau
	Kernel modules: nouveau