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A deadlock situation has arised between the userq signal ioctl and the eviction fence. In this scenario, the function amdgpu_userq_signal_ioctl() has acquired a reservation lock on the read/write buffer object (BO) through drm_exec. Subsequently, it calls amdgpu_userqueue_ensure_ev_fence(), which is in a waiting for the userq resume work. Meanwhile, the userq suspend worker has initiated the userq resume work(amdgpu_userqueue_resume_worker). This userq resume work attempts to validate the vm->done BO, leading to amdgpu_userqueue_validate_bos also attempting to reservation lock the same write BO that is already locked by amdgpu_userq_signal_ioctl. As a result, the resume work becomes stalled, causing amdgpu_userqueue_ensure_ev_fence to remain in a waiting state. Call Trace: [ 242.836469] INFO: task gnome-shel:cs0:1288 blocked for more than 120 seconds. [ 242.836486] Tainted: G OE 6.12.0-rc2rebased-oct-24+ #4 [ 242.836491] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 242.836494] task:gnome-shel:cs0 state:D stack:0 pid:1288 tgid:1282 ppid:1180 flags:0x00000002 [ 242.836503] Call Trace: [ 242.836508] <TASK> [ 242.836517] __schedule+0x3e0/0xb10 [ 242.836530] ? srso_return_thunk+0x5/0x5f [ 242.836541] schedule+0x31/0x120 [ 242.836546] schedule_timeout+0x150/0x160 [ 242.836551] ? srso_return_thunk+0x5/0x5f [ 242.836555] ? sysvec_call_function+0x69/0xd0 [ 242.836562] ? srso_return_thunk+0x5/0x5f [ 242.836567] ? preempt_count_add+0x7f/0xd0 [ 242.836577] __wait_for_common+0x91/0x180 [ 242.836582] ? __pfx_schedule_timeout+0x10/0x10 [ 242.836590] wait_for_completion+0x28/0x30 [ 242.836595] __flush_work+0x16c/0x290 [ 242.836602] ? __pfx_wq_barrier_func+0x10/0x10 [ 242.836611] flush_delayed_work+0x3a/0x60 [ 242.836621] amdgpu_userqueue_ensure_ev_fence+0x2d/0xb0 [amdgpu] [ 242.836966] amdgpu_userq_signal_ioctl+0x959/0xec0 [amdgpu] [ 242.837171] ? __pfx_amdgpu_userq_signal_ioctl+0x10/0x10 [amdgpu] [ 242.837365] drm_ioctl_kernel+0xae/0x100 [drm] [ 242.837398] drm_ioctl+0x2a1/0x500 [drm] [ 242.837420] ? __pfx_amdgpu_userq_signal_ioctl+0x10/0x10 [amdgpu] [ 242.837622] ? srso_return_thunk+0x5/0x5f [ 242.837627] ? srso_return_thunk+0x5/0x5f [ 242.837630] ? _raw_spin_unlock_irqrestore+0x2b/0x50 [ 242.837635] amdgpu_drm_ioctl+0x4f/0x90 [amdgpu] [ 242.837811] __x64_sys_ioctl+0x99/0xd0 [ 242.837820] x64_sys_call+0x1209/0x20d0 [ 242.837825] do_syscall_64+0x51/0x120 [ 242.837830] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 242.837835] RIP: 0033:0x7f2f33f1a94f [ 242.837838] RSP: 002b:00007f2f24ffea30 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 242.837842] RAX: ffffffffffffffda RBX: 00007f2f24ffebd0 RCX: 00007f2f33f1a94f [ 242.837845] RDX: 00007f2f24ffebd0 RSI: 00000000c0306457 RDI: 000000000000000d [ 242.837847] RBP: 00007f2f24ffeab0 R08: 0000000000000000 R09: 0000000000000000 [ 242.837849] R10: 00007f2f24ffecd0 R11: 0000000000000246 R12: 00007f2f25000640 [ 242.837851] R13: 00000000c0306457 R14: 000000000000000d R15: 00007fff3b39c1e0 [ 242.837858] </TASK> [ 242.837865] INFO: task Xwayland:cs0:1517 blocked for more than 120 seconds. [ 242.837869] Tainted: G OE 6.12.0-rc2rebased-oct-24+ #4 [ 242.837872] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 242.837874] task:Xwayland:cs0 state:D stack:0 pid:1517 tgid:1338 ppid:1282 flags:0x00004002 [ 242.837878] Call Trace: [ 242.837880] <TASK> [ 242.837883] __schedule+0x3e0/0xb10 [ 242.837890] schedule+0x31/0x120 [ 242.837894] schedule_preempt_disabled+0x1c/0x30 [ 242.837897] __mutex_lock.constprop.0+0x386/0x6e0 [ 242.837902] ? srso_return_thunk+0x5/0x5f [ 242.837905] ? __timer_delete_sync+0x81/0xe0 [ 242.837911] __mutex_lock_slowpath+0x13/0x20 [ 242.837915] mutex_lock+0x3b/0x50 [ 242.837919] amdgpu_userqueue_ensure_ev_fence+0x35/0xb0 [amdgpu] [ 242.838138] amdgpu_userq_signal_ioctl+0x959/0xec0 [amdgpu] [ 242.838340] ? __pfx_amdgpu_userq_signal_ioctl+0x10/0x10 [amdgpu] [ 242.838531] drm_ioctl_kernel+0xae/0x100 [drm] [ 242.838559] drm_ioctl+0x2a1/0x500 [drm] [ 242.838580] ? __pfx_amdgpu_userq_signal_ioctl+0x10/0x10 [amdgpu] [ 242.838778] ? srso_return_thunk+0x5/0x5f [ 242.838783] ? srso_return_thunk+0x5/0x5f [ 242.838786] ? _raw_spin_unlock_irqrestore+0x2b/0x50 [ 242.838791] amdgpu_drm_ioctl+0x4f/0x90 [amdgpu] [ 242.838967] __x64_sys_ioctl+0x99/0xd0 [ 242.838972] x64_sys_call+0x1209/0x20d0 [ 242.838975] do_syscall_64+0x51/0x120 [ 242.838979] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 242.838982] RIP: 0033:0x7f9118b1a94f [ 242.838985] RSP: 002b:00007f910cdff760 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 242.838989] RAX: ffffffffffffffda RBX: 00007f910cdff910 RCX: 00007f9118b1a94f [ 242.838991] RDX: 00007f910cdff910 RSI: 00000000c0306457 RDI: 000000000000000c [ 242.838993] RBP: 00007f910cdff7e0 R08: 0000000000000000 R09: 0000000000000001 [ 242.838995] R10: 00007f910cdff9d4 R11: 0000000000000246 R12: 00007f910ce00640 [ 242.838997] R13: 00000000c0306457 R14: 000000000000000c R15: 00007fff9dd11d10 [ 242.839004] </TASK> v2: Addressed review comemnts from Christian. v3/v4: Addressed review comemnts from Christian. - Move drm_exec drm_exec loop after userq fence create. - cleanup the newly created userq fence in case of error. v5 - Addressed review comemnts from Christian. - Create a new amdgpu_userq_fence_alloc() function for allocation. - Calling dma_fence_put for cleanup procedure. - make amdgpu_userq_fence_create() function static. - drm_exec_init is called after mutex_unlock. Cc: Alex Deucher <alexander.deucher@amd.com> Cc: Christian König <christian.koenig@amd.com> Cc: Shashank Sharma <shashank.sharma@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Arvind Yadav <arvind.yadav@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Linux kernel
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