2164585.634678] INFO: task kcompactd0:41 blocked for more than 120 seconds. [2164585.634697] Tainted: G U 4.19.31-041931-generic #201903231635 [2164585.634704] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2164585.634711] kcompactd0 D 0 41 2 0x80000000 [2164585.634718] Call Trace: [2164585.634735] __schedule+0x29f/0x850 [2164585.634741] ? enqueue_entity+0xfe/0x640 [2164585.634747] schedule+0x2c/0x80 [2164585.634752] schedule_timeout+0x258/0x360 [2164585.634757] ? ttwu_do_wakeup+0x1e/0x140 [2164585.634761] ? ttwu_do_activate+0x67/0x90 [2164585.634765] wait_for_completion+0xb7/0x140 [2164585.634769] ? wake_up_q+0x80/0x80 [2164585.634773] flush_workqueue+0x128/0x3f0 [2164585.634854] i915_gem_userptr_mn_invalidate_range_start+0x18f/0x1b0 [i915] [2164585.634861] __mmu_notifier_invalidate_range_start+0x8a/0xc0 [2164585.634867] try_to_unmap_one+0x11a/0xa80 [2164585.634874] rmap_walk_anon+0xfa/0x260 [2164585.634878] rmap_walk+0x41/0x60 [2164585.634882] try_to_unmap+0x9b/0xf0 [2164585.634886] ? page_remove_rmap+0x350/0x350 [2164585.634889] ? page_not_mapped+0x20/0x20 [2164585.634893] ? page_get_anon_vma+0x80/0x80 [2164585.634896] ? invalid_mkclean_vma+0x20/0x20 [2164585.634900] migrate_pages+0x8bb/0xb20 [2164585.634907] ? __ClearPageMovable+0x10/0x10 [2164585.634912] ? isolate_freepages_block+0x3b0/0x3b0 [2164585.634918] compact_zone+0x677/0x910 [2164585.634925] kcompactd_do_work+0x13f/0x2e0 [2164585.634930] ? __switch_to+0x96/0x4e0 [2164585.634938] kcompactd+0x86/0x1c0 [2164585.634943] ? wait_woken+0x80/0x80 [2164585.634950] kthread+0x120/0x140 [2164585.634955] ? kcompactd_do_work+0x2e0/0x2e0 [2164585.634960] ? kthread_bind+0x40/0x40 [2164585.634965] ret_from_fork+0x35/0x40 [2164585.635116] INFO: task python:26454 blocked for more than 120 seconds. [2164585.635124] Tainted: G U 4.19.31-041931-generic #201903231635 [2164585.635130] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2164585.635136] python D 0 26454 26313 0x00000320 [2164585.635140] Call Trace: [2164585.635149] __schedule+0x29f/0x850 [2164585.635153] ? __switch_to_asm+0x34/0x70 [2164585.635159] schedule+0x2c/0x80 [2164585.635163] schedule_timeout+0x258/0x360 [2164585.635169] ? __schedule+0x2a7/0x850 [2164585.635172] ? ttwu_do_activate+0x67/0x90 [2164585.635176] wait_for_completion+0xb7/0x140 [2164585.635180] ? wake_up_q+0x80/0x80 [2164585.635184] flush_workqueue+0x128/0x3f0 [2164585.635255] i915_gem_userptr_mn_invalidate_range_start+0x18f/0x1b0 [i915] [2164585.635261] __mmu_notifier_invalidate_range_start+0x8a/0xc0 [2164585.635266] try_to_unmap_one+0x11a/0xa80 [2164585.635271] rmap_walk_anon+0xfa/0x260 [2164585.635276] rmap_walk+0x41/0x60 [2164585.635279] try_to_unmap+0x9b/0xf0 [2164585.635283] ? page_remove_rmap+0x350/0x350 [2164585.635286] ? page_not_mapped+0x20/0x20 [2164585.635289] ? page_get_anon_vma+0x80/0x80 [2164585.635293] ? invalid_mkclean_vma+0x20/0x20 [2164585.635297] migrate_pages+0x8bb/0xb20 [2164585.635302] ? __ClearPageMovable+0x10/0x10 [2164585.635308] ? isolate_freepages_block+0x3b0/0x3b0 [2164585.635314] compact_zone+0x677/0x910 [2164585.635321] compact_zone_order+0x98/0xc0 [2164585.635326] try_to_compact_pages+0xa9/0x260 [2164585.635332] __alloc_pages_direct_compact+0x51/0x100 [2164585.635336] __alloc_pages_slowpath+0x446/0xdd0 [2164585.635397] ? vm_alloc_page.constprop.57+0x142/0x250 [i915] [2164585.635404] ? _cond_resched+0x19/0x30 [2164585.635409] __alloc_pages_nodemask+0x29a/0x2c0 [2164585.635415] kmalloc_large_node+0x3b/0x60 [2164585.635420] __kmalloc_node+0x212/0x2c0 [2164585.635427] kvmalloc_node+0x43/0x80 [2164585.635490] i915_gem_userptr_get_pages+0x16e/0x1f0 [i915] [2164585.635550] ____i915_gem_object_get_pages+0x22/0x40 [i915] [2164585.635608] __i915_gem_object_get_pages+0x5b/0x70 [i915] [2164585.635671] __i915_vma_do_pin+0x2d0/0x4b0 [i915] [2164585.635728] eb_lookup_vmas+0x69b/0xb70 [i915] [2164585.635734] ? _cond_resched+0x19/0x30 [2164585.635741] ? __pm_runtime_resume+0x5b/0x80 [2164585.635797] i915_gem_do_execbuffer+0x391/0x10a0 [i915] [2164585.635804] ? cpumask_next_and+0x1e/0x20 [2164585.635808] ? load_balance+0x18c/0x9d0 [2164585.635813] ? __switch_to_asm+0x40/0x70 [2164585.635817] ? __switch_to_asm+0x34/0x70 [2164585.635823] ? __switch_to_xtra+0x189/0x5b0 [2164585.635827] ? __switch_to_asm+0x40/0x70 [2164585.635830] ? __switch_to_asm+0x34/0x70 [2164585.635834] ? __switch_to_asm+0x40/0x70 [2164585.635837] ? __switch_to_asm+0x34/0x70 [2164585.635841] ? __switch_to_asm+0x40/0x70 [2164585.635844] ? __switch_to_asm+0x40/0x70 [2164585.635848] ? __switch_to+0x471/0x4e0 [2164585.635852] ? __switch_to_asm+0x40/0x70 [2164585.635856] ? __switch_to_asm+0x34/0x70 [2164585.635859] ? __switch_to_asm+0x40/0x70 [2164585.635865] ? __kmalloc_node+0x1e9/0x2c0 [2164585.635921] i915_gem_execbuffer2_ioctl+0x1cd/0x350 [i915] [2164585.635928] ? futex_wait_queue_me+0xd6/0x120 [2164585.635982] ? i915_gem_execbuffer_ioctl+0x2b0/0x2b0 [i915] [2164585.636012] drm_ioctl_kernel+0xa4/0xf0 [drm] [2164585.636039] drm_ioctl+0x239/0x3f0 [drm] [2164585.636093] ? i915_gem_execbuffer_ioctl+0x2b0/0x2b0 [i915] [2164585.636100] ? __switch_to_asm+0x34/0x70 [2164585.636104] ? __switch_to_asm+0x40/0x70 [2164585.636107] ? __switch_to_asm+0x34/0x70 [2164585.636113] do_vfs_ioctl+0xa9/0x640 [2164585.636119] ? __secure_computing+0x3e/0xd0 [2164585.636124] ksys_ioctl+0x67/0x90 [2164585.636129] __x64_sys_ioctl+0x1a/0x20 [2164585.636135] do_syscall_64+0x5a/0x110 [2164585.636139] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [2164585.636144] RIP: 0033:0x7fe8f9b805d7 [2164585.636155] Code: Bad RIP value. [2164585.636158] RSP: 002b:00007fe88bffc2d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [2164585.636162] RAX: ffffffffffffffda RBX: 00000000000000c0 RCX: 00007fe8f9b805d7 [2164585.636164] RDX: 00007fe88bffc320 RSI: 0000000040406469 RDI: 0000000000000069 [2164585.636166] RBP: 00007fe88bffc320 R08: 0000000000000000 R09: 0000000000000000 [2164585.636168] R10: 00007fe88bffcb00 R11: 0000000000000246 R12: 0000000040406469 [2164585.636170] R13: 00007fe8805cc730 R14: 0000000000000000 R15: 0000000000000a80 [2164585.636179] INFO: task python:26466 blocked for more than 120 seconds. [2164585.636186] Tainted: G U 4.19.31-041931-generic #201903231635 [2164585.636192] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2164585.636197] python D 0 26466 26346 0x80000320 [2164585.636201] Call Trace: [2164585.636209] __schedule+0x29f/0x850 [2164585.636215] schedule+0x2c/0x80 [2164585.636220] rwsem_down_write_failed+0x167/0x340 [2164585.636225] ? __slab_free+0x225/0x340 [2164585.636231] call_rwsem_down_write_failed+0x17/0x30 [2164585.636236] ? unlink_anon_vmas+0x130/0x1a0 [2164585.636239] down_write+0x2d/0x40 [2164585.636243] unlink_anon_vmas+0x78/0x1a0 [2164585.636248] free_pgtables+0xbf/0x110 [2164585.636254] exit_mmap+0xc9/0x190 [2164585.636258] ? __seccomp_filter+0x49/0x4b0 [2164585.636264] mmput+0x57/0x130 [2164585.636270] do_exit+0x288/0xb30 [2164585.636275] ? __secure_computing+0x3e/0xd0 [2164585.636280] ? syscall_trace_enter+0x196/0x2c0 [2164585.636286] do_group_exit+0x43/0xb0 [2164585.636292] __x64_sys_exit_group+0x18/0x20 [2164585.636296] do_syscall_64+0x5a/0x110 [2164585.636301] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [2164585.636304] RIP: 0033:0x7fe8f9b4ee06 [2164585.636310] Code: Bad RIP value. [2164585.636312] RSP: 002b:00007fff9e6cf3e8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [2164585.636316] RAX: ffffffffffffffda RBX: 000055b9a783f2f0 RCX: 00007fe8f9b4ee06 [2164585.636317] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [2164585.636319] RBP: 00007fe8d071b0ef R08: 00000000000000e7 R09: ffffffffffffff80 [2164585.636321] R10: 0000000000000001 R11: 0000000000000202 R12: 0000000000000000 [2164585.636323] R13: 00007fe8d07a6960 R14: 00007fe8d07b4410 R15: 00007fe8fa01d0f0 [2164585.636368] INFO: task kworker/u8:2:1742 blocked for more than 120 seconds. [2164585.636374] Tainted: G U 4.19.31-041931-generic #201903231635 [2164585.636379] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2164585.636387] kworker/u8:2 D 0 1742 2 0x80000000 [2164585.636454] Workqueue: i915-userptr-release cancel_userptr [i915] [2164585.636457] Call Trace: [2164585.636464] __schedule+0x29f/0x850 [2164585.636471] schedule+0x2c/0x80 [2164585.636477] schedule_preempt_disabled+0xe/0x10 [2164585.636481] __mutex_lock.isra.6+0x2e0/0x4c0 [2164585.636538] ? i915_gem_object_wait_reservation+0x263/0x2a0 [i915] [2164585.636544] __mutex_lock_slowpath+0x13/0x20 [2164585.636547] mutex_lock+0x2c/0x30 [2164585.636607] cancel_userptr+0x80/0xf0 [i915] [2164585.636612] process_one_work+0x20f/0x410 [2164585.636616] worker_thread+0x34/0x400 [2164585.636622] kthread+0x120/0x140 [2164585.636625] ? process_one_work+0x410/0x410 [2164585.636630] ? kthread_bind+0x40/0x40 [2164585.636635] ret_from_fork+0x35/0x40 [2164585.636641] INFO: task kworker/u8:1:1845 blocked for more than 120 seconds. [2164585.636648] Tainted: G U 4.19.31-041931-generic #201903231635 [2164585.636653] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2164585.636659] kworker/u8:1 D 0 1845 2 0x80000000 [2164585.636722] Workqueue: i915-userptr-release cancel_userptr [i915] [2164585.636724] Call Trace: [2164585.636732] __schedule+0x29f/0x850 [2164585.636738] schedule+0x2c/0x80 [2164585.636744] schedule_preempt_disabled+0xe/0x10 [2164585.636747] __mutex_lock.isra.6+0x2e0/0x4c0 [2164585.636804] ? i915_gem_object_wait_reservation+0x263/0x2a0 [i915] [2164585.636810] __mutex_lock_slowpath+0x13/0x20 [2164585.636813] mutex_lock+0x2c/0x30 [2164585.636871] cancel_userptr+0x80/0xf0 [i915] [2164585.636876] process_one_work+0x20f/0x410 [2164585.636880] worker_thread+0x34/0x400 [2164585.636885] kthread+0x120/0x140 [2164585.636889] ? process_one_work+0x410/0x410 [2164585.636893] ? kthread_bind+0x40/0x40 [2164585.636898] ret_from_fork+0x35/0x40 [2164706.466672] INFO: task kcompactd0:41 blocked for more than 120 seconds. [2164706.466688] Tainted: G U 4.19.31-041931-generic #201903231635 [2164706.466696] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2164706.466704] kcompactd0 D 0 41 2 0x80000000 [2164706.466710] Call Trace: [2164706.466727] __schedule+0x29f/0x850 [2164706.466733] ? enqueue_entity+0xfe/0x640 [2164706.466740] schedule+0x2c/0x80 [2164706.466744] schedule_timeout+0x258/0x360 [2164706.466749] ? ttwu_do_wakeup+0x1e/0x140 [2164706.466753] ? ttwu_do_activate+0x67/0x90 [2164706.466757] wait_for_completion+0xb7/0x140 [2164706.466761] ? wake_up_q+0x80/0x80 [2164706.466766] flush_workqueue+0x128/0x3f0 [2164706.466843] i915_gem_userptr_mn_invalidate_range_start+0x18f/0x1b0 [i915] [2164706.466850] __mmu_notifier_invalidate_range_start+0x8a/0xc0 [2164706.466856] try_to_unmap_one+0x11a/0xa80 [2164706.466863] rmap_walk_anon+0xfa/0x260 [2164706.466867] rmap_walk+0x41/0x60 [2164706.466871] try_to_unmap+0x9b/0xf0 [2164706.466875] ? page_remove_rmap+0x350/0x350 [2164706.466879] ? page_not_mapped+0x20/0x20 [2164706.466882] ? page_get_anon_vma+0x80/0x80 [2164706.466886] ? invalid_mkclean_vma+0x20/0x20 [2164706.466890] migrate_pages+0x8bb/0xb20 [2164706.466896] ? __ClearPageMovable+0x10/0x10 [2164706.466902] ? isolate_freepages_block+0x3b0/0x3b0 [2164706.466909] compact_zone+0x677/0x910 [2164706.466916] kcompactd_do_work+0x13f/0x2e0 [2164706.466920] ? __switch_to+0x96/0x4e0 [2164706.466928] kcompactd+0x86/0x1c0 [2164706.466934] ? wait_woken+0x80/0x80 [2164706.466940] kthread+0x120/0x140 [2164706.466946] ? kcompactd_do_work+0x2e0/0x2e0 [2164706.466951] ? kthread_bind+0x40/0x40 [2164706.466956] ret_from_fork+0x35/0x40 [2164706.467109] INFO: task python:26454 blocked for more than 120 seconds. [2164706.467118] Tainted: G U 4.19.31-041931-generic #201903231635 [2164706.467124] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2164706.467131] python D 0 26454 26313 0x00000320 [2164706.467136] Call Trace: [2164706.467143] __schedule+0x29f/0x850 [2164706.467148] ? __switch_to_asm+0x34/0x70 [2164706.467154] schedule+0x2c/0x80 [2164706.467158] schedule_timeout+0x258/0x360 [2164706.467164] ? __schedule+0x2a7/0x850 [2164706.467168] ? ttwu_do_activate+0x67/0x90 [2164706.467172] wait_for_completion+0xb7/0x140 [2164706.467176] ? wake_up_q+0x80/0x80 [2164706.467180] flush_workqueue+0x128/0x3f0 [2164706.467250] i915_gem_userptr_mn_invalidate_range_start+0x18f/0x1b0 [i915] [2164706.467257] __mmu_notifier_invalidate_range_start+0x8a/0xc0 [2164706.467262] try_to_unmap_one+0x11a/0xa80 [2164706.467268] rmap_walk_anon+0xfa/0x260 [2164706.467273] rmap_walk+0x41/0x60 [2164706.467276] try_to_unmap+0x9b/0xf0 [2164706.467280] ? page_remove_rmap+0x350/0x350 [2164706.467283] ? page_not_mapped+0x20/0x20 [2164706.467287] ? page_get_anon_vma+0x80/0x80 [2164706.467290] ? invalid_mkclean_vma+0x20/0x20 [2164706.467294] migrate_pages+0x8bb/0xb20 [2164706.467300] ? __ClearPageMovable+0x10/0x10 [2164706.467305] ? isolate_freepages_block+0x3b0/0x3b0 [2164706.467311] compact_zone+0x677/0x910 [2164706.467318] compact_zone_order+0x98/0xc0 [2164706.467323] try_to_compact_pages+0xa9/0x260 [2164706.467329] __alloc_pages_direct_compact+0x51/0x100 [2164706.467334] __alloc_pages_slowpath+0x446/0xdd0 [2164706.467395] ? vm_alloc_page.constprop.57+0x142/0x250 [i915] [2164706.467402] ? _cond_resched+0x19/0x30 [2164706.467408] __alloc_pages_nodemask+0x29a/0x2c0 [2164706.467414] kmalloc_large_node+0x3b/0x60 [2164706.467419] __kmalloc_node+0x212/0x2c0 [2164706.467426] kvmalloc_node+0x43/0x80 [2164706.467490] i915_gem_userptr_get_pages+0x16e/0x1f0 [i915] [2164706.467551] ____i915_gem_object_get_pages+0x22/0x40 [i915] [2164706.467610] __i915_gem_object_get_pages+0x5b/0x70 [i915] [2164706.467674] __i915_vma_do_pin+0x2d0/0x4b0 [i915] [2164706.467731] eb_lookup_vmas+0x69b/0xb70 [i915] [2164706.467738] ? _cond_resched+0x19/0x30 [2164706.467744] ? __pm_runtime_resume+0x5b/0x80 [2164706.467801] i915_gem_do_execbuffer+0x391/0x10a0 [i915] [2164706.467808] ? cpumask_next_and+0x1e/0x20 [2164706.467812] ? load_balance+0x18c/0x9d0 [2164706.467818] ? __switch_to_asm+0x40/0x70 [2164706.467822] ? __switch_to_asm+0x34/0x70 [2164706.467828] ? __switch_to_xtra+0x189/0x5b0 [2164706.467831] ? __switch_to_asm+0x40/0x70 [2164706.467835] ? __switch_to_asm+0x34/0x70 [2164706.467839] ? __switch_to_asm+0x40/0x70 [2164706.467842] ? __switch_to_asm+0x34/0x70 [2164706.467846] ? __switch_to_asm+0x40/0x70 [2164706.467849] ? __switch_to_asm+0x40/0x70 [2164706.467853] ? __switch_to+0x471/0x4e0 [2164706.467857] ? __switch_to_asm+0x40/0x70 [2164706.467860] ? __switch_to_asm+0x34/0x70 [2164706.467864] ? __switch_to_asm+0x40/0x70 [2164706.467870] ? __kmalloc_node+0x1e9/0x2c0 [2164706.467926] i915_gem_execbuffer2_ioctl+0x1cd/0x350 [i915] [2164706.467933] ? futex_wait_queue_me+0xd6/0x120 [2164706.467987] ? i915_gem_execbuffer_ioctl+0x2b0/0x2b0 [i915] [2164706.468018] drm_ioctl_kernel+0xa4/0xf0 [drm] [2164706.468044] drm_ioctl+0x239/0x3f0 [drm] [2164706.468099] ? i915_gem_execbuffer_ioctl+0x2b0/0x2b0 [i915] [2164706.468106] ? __switch_to_asm+0x34/0x70 [2164706.468109] ? __switch_to_asm+0x40/0x70 [2164706.468113] ? __switch_to_asm+0x34/0x70 [2164706.468119] do_vfs_ioctl+0xa9/0x640 [2164706.468125] ? __secure_computing+0x3e/0xd0 [2164706.468130] ksys_ioctl+0x67/0x90 [2164706.468134] __x64_sys_ioctl+0x1a/0x20 [2164706.468141] do_syscall_64+0x5a/0x110 [2164706.468145] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [2164706.468150] RIP: 0033:0x7fe8f9b805d7 [2164706.468162] Code: Bad RIP value. [2164706.468164] RSP: 002b:00007fe88bffc2d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [2164706.468169] RAX: ffffffffffffffda RBX: 00000000000000c0 RCX: 00007fe8f9b805d7 [2164706.468171] RDX: 00007fe88bffc320 RSI: 0000000040406469 RDI: 0000000000000069 [2164706.468173] RBP: 00007fe88bffc320 R08: 0000000000000000 R09: 0000000000000000 [2164706.468175] R10: 00007fe88bffcb00 R11: 0000000000000246 R12: 0000000040406469 [2164706.468177] R13: 00007fe8805cc730 R14: 0000000000000000 R15: 0000000000000a80 [2164706.468187] INFO: task python:26466 blocked for more than 120 seconds. [2164706.468195] Tainted: G U 4.19.31-041931-generic #201903231635 [2164706.468201] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2164706.468208] python D 0 26466 26346 0x80000320 [2164706.468212] Call Trace: [2164706.468219] __schedule+0x29f/0x850 [2164706.468226] schedule+0x2c/0x80 [2164706.468230] rwsem_down_write_failed+0x167/0x340 [2164706.468235] ? __slab_free+0x225/0x340 [2164706.468241] call_rwsem_down_write_failed+0x17/0x30 [2164706.468245] ? unlink_anon_vmas+0x130/0x1a0 [2164706.468249] down_write+0x2d/0x40 [2164706.468253] unlink_anon_vmas+0x78/0x1a0 [2164706.468258] free_pgtables+0xbf/0x110 [2164706.468263] exit_mmap+0xc9/0x190 [2164706.468268] ? __seccomp_filter+0x49/0x4b0 [2164706.468274] mmput+0x57/0x130 [2164706.468280] do_exit+0x288/0xb30 [2164706.468284] ? __secure_computing+0x3e/0xd0 [2164706.468289] ? syscall_trace_enter+0x196/0x2c0 [2164706.468295] do_group_exit+0x43/0xb0 [2164706.468301] __x64_sys_exit_group+0x18/0x20 [2164706.468306] do_syscall_64+0x5a/0x110 [2164706.468311] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [2164706.468314] RIP: 0033:0x7fe8f9b4ee06 [2164706.468320] Code: Bad RIP value. [2164706.468322] RSP: 002b:00007fff9e6cf3e8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [2164706.468326] RAX: ffffffffffffffda RBX: 000055b9a783f2f0 RCX: 00007fe8f9b4ee06 [2164706.468328] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [2164706.468329] RBP: 00007fe8d071b0ef R08: 00000000000000e7 R09: ffffffffffffff80 [2164706.468331] R10: 0000000000000001 R11: 0000000000000202 R12: 0000000000000000 [2164706.468333] R13: 00007fe8d07a6960 R14: 00007fe8d07b4410 R15: 00007fe8fa01d0f0 [2164706.468377] INFO: task kworker/u8:2:1742 blocked for more than 120 seconds. [2164706.468384] Tainted: G U 4.19.31-041931-generic #201903231635 [2164706.468390] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2164706.468396] kworker/u8:2 D 0 1742 2 0x80000000 [2164706.468463] Workqueue: i915-userptr-release cancel_userptr [i915] [2164706.468466] Call Trace: [2164706.468474] __schedule+0x29f/0x850 [2164706.468480] schedule+0x2c/0x80 [2164706.468486] schedule_preempt_disabled+0xe/0x10 [2164706.468490] __mutex_lock.isra.6+0x2e0/0x4c0 [2164706.468547] ? i915_gem_object_wait_reservation+0x263/0x2a0 [i915] [2164706.468553] __mutex_lock_slowpath+0x13/0x20 [2164706.468556] mutex_lock+0x2c/0x30 [2164706.468616] cancel_userptr+0x80/0xf0 [i915] [2164706.468621] process_one_work+0x20f/0x410 [2164706.468625] worker_thread+0x34/0x400 [2164706.468631] kthread+0x120/0x140 [2164706.468634] ? process_one_work+0x410/0x410 [2164706.468639] ? kthread_bind+0x40/0x40 [2164706.468644] ret_from_fork+0x35/0x40 [2164706.468650] INFO: task kworker/u8:1:1845 blocked for more than 120 seconds. [2164706.468657] Tainted: G U 4.19.31-041931-generic #201903231635 [2164706.468662] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [2164706.468669] kworker/u8:1 D 0 1845 2 0x80000000 [2164706.468731] Workqueue: i915-userptr-release cancel_userptr [i915] [2164706.468734] Call Trace: [2164706.468741] __schedule+0x29f/0x850 [2164706.468747] schedule+0x2c/0x80 [2164706.468753] schedule_preempt_disabled+0xe/0x10 [2164706.468756] __mutex_lock.isra.6+0x2e0/0x4c0 [2164706.468813] ? i915_gem_object_wait_reservation+0x263/0x2a0 [i915] [2164706.468819] __mutex_lock_slowpath+0x13/0x20 [2164706.468822] mutex_lock+0x2c/0x30 [2164706.468880] cancel_userptr+0x80/0xf0 [i915] [2164706.468885] process_one_work+0x20f/0x410 [2164706.468888] worker_thread+0x34/0x400 [2164706.468894] kthread+0x120/0x140 [2164706.468897] ? process_one_work+0x410/0x410 [2164706.468902] ? kthread_bind+0x40/0x40 [2164706.468907] ret_from_fork+0x35/0x40