Comment 2 for bug 1856091

I extracted the following from /var/log/syslog:

Dec 11 20:53:17 solidus kernel: [ 6767.461655] INFO: task Xorg:3261 blocked for more than 120 seconds.
Dec 11 20:53:17 solidus kernel: [ 6767.462842] Tainted: G OE 5.3.0-24-generic #26-Ubuntu
Dec 11 20:53:17 solidus kernel: [ 6767.463851] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 11 20:53:17 solidus kernel: [ 6767.464887] Xorg D 0 3261 3259 0x00000004
Dec 11 20:53:17 solidus kernel: [ 6767.465947] Call Trace:
Dec 11 20:53:17 solidus kernel: [ 6767.466998] __schedule+0x2b9/0x6c0
Dec 11 20:53:17 solidus kernel: [ 6767.468054] schedule+0x42/0xb0
Dec 11 20:53:17 solidus kernel: [ 6767.469116] schedule_timeout+0x203/0x2f0
Dec 11 20:53:17 solidus kernel: [ 6767.470187] ? __wake_up_common_lock+0x8a/0xc0
Dec 11 20:53:17 solidus kernel: [ 6767.471259] dma_fence_default_wait+0x1a5/0x290
Dec 11 20:53:17 solidus kernel: [ 6767.472335] ? dma_fence_free+0x20/0x20
Dec 11 20:53:17 solidus kernel: [ 6767.473421] dma_fence_wait_timeout+0xe7/0xf0
Dec 11 20:53:17 solidus kernel: [ 6767.474572] gmc_v10_0_flush_gpu_tlb+0x163/0x1a0 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.475709] amdgpu_gart_bind+0x67/0x90 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.476838] amdgpu_ttm_gart_bind+0x78/0xc0 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.478014] amdgpu_ttm_alloc_gart+0x21c/0x2e0 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.479189] ? ttm_bo_unreserve+0x60/0x60 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.480356] amdgpu_vm_sdma_map_table+0x2f/0x40 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.481562] amdgpu_vm_clear_bo+0x170/0x3c0 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.482703] ? _cond_resched+0x19/0x30
Dec 11 20:53:17 solidus kernel: [ 6767.483838] ? mutex_lock+0x13/0x40
Dec 11 20:53:17 solidus kernel: [ 6767.485044] amdgpu_vm_update_ptes+0x292/0x750 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.486233] ? _cond_resched+0x19/0x30
Dec 11 20:53:17 solidus kernel: [ 6767.487403] ? __kmalloc+0x180/0x270
Dec 11 20:53:17 solidus kernel: [ 6767.488641] amdgpu_vm_bo_update_mapping+0xb3/0xe0 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.489887] amdgpu_vm_bo_update+0x317/0x720 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.491125] amdgpu_gem_va_ioctl+0x502/0x530 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.492345] ? idr_remove+0x11/0x20
Dec 11 20:53:17 solidus kernel: [ 6767.493607] ? amdgpu_gem_metadata_ioctl+0x1b0/0x1b0 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.494849] drm_ioctl_kernel+0xae/0xf0 [drm]
Dec 11 20:53:17 solidus kernel: [ 6767.496088] ? native_flush_tlb_others+0xc7/0x130
Dec 11 20:53:17 solidus kernel: [ 6767.497322] drm_ioctl+0x234/0x3d0 [drm]
Dec 11 20:53:17 solidus kernel: [ 6767.498599] ? amdgpu_gem_metadata_ioctl+0x1b0/0x1b0 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.499909] amdgpu_drm_ioctl+0x4e/0x80 [amdgpu]
Dec 11 20:53:17 solidus kernel: [ 6767.501163] do_vfs_ioctl+0x407/0x670
Dec 11 20:53:17 solidus kernel: [ 6767.502416] ksys_ioctl+0x67/0x90
Dec 11 20:53:17 solidus kernel: [ 6767.503691] __x64_sys_ioctl+0x1a/0x20
Dec 11 20:53:17 solidus kernel: [ 6767.504958] do_syscall_64+0x5a/0x130
Dec 11 20:53:17 solidus kernel: [ 6767.506226] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Dec 11 20:53:17 solidus kernel: [ 6767.507528] RIP: 0033:0x7efbfec8867b
Dec 11 20:53:17 solidus kernel: [ 6767.508826] Code: Bad RIP value.
Dec 11 20:53:17 solidus kernel: [ 6767.510110] RSP: 002b:00007ffbffffaad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
Dec 11 20:53:17 solidus kernel: [ 6767.511432] RAX: ffffffffffffffda RBX: 00007ffbffffab20 RCX: 00007efbfec8867b
Dec 11 20:53:17 solidus kernel: [ 6767.512768] RDX: 00007ffbffffab20 RSI: 00000000c0286448 RDI: 000000000000000d
Dec 11 20:53:17 solidus kernel: [ 6767.514122] RBP: 00000000c0286448 R08: ffff80010e800000 R09: 000000000000000e
Dec 11 20:53:17 solidus kernel: [ 6767.515475] R10: 0000000000000017 R11: 0000000000000246 R12: 0000565559a24f90
Dec 11 20:53:17 solidus kernel: [ 6767.516844] R13: 000000000000000d R14: 0000000000dec000 R15: 000056555785e800