INFO: task syz.1.287:5979 blocked for more than 430 seconds. Not tainted syzkaller #0 Blocked by coredump. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.287 state:D stack:0 pid:5979 tgid:5976 ppid:5438 task_flags:0x40044c flags:0x00000018 Call trace: __switch_to+0x584/0xb20 arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1eec/0x33a4 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xac/0x27c kernel/sched/core.c:7058 schedule_timeout+0x5c/0x1e4 kernel/time/sleep_timeout.c:75 do_wait_for_common+0x28c/0x444 kernel/sched/completion.c:100 __wait_for_common kernel/sched/completion.c:121 [inline] wait_for_common kernel/sched/completion.c:132 [inline] wait_for_completion+0x44/0x5c kernel/sched/completion.c:153 __synchronize_srcu+0x2a4/0x320 kernel/rcu/srcutree.c:1444 synchronize_srcu+0x3cc/0x4f0 kernel/rcu/srcutree.c:-1 mmu_notifier_unregister+0x320/0x42c mm/mmu_notifier.c:831 kvm_destroy_vm virt/kvm/kvm_main.c:1295 [inline] kvm_put_kvm+0x6a0/0xfa8 virt/kvm/kvm_main.c:1353 kvm_vm_release+0x58/0x78 virt/kvm/kvm_main.c:1376 __fput+0x4ac/0x980 fs/file_table.c:468 ____fput+0x20/0x58 fs/file_table.c:496 task_work_run+0x1bc/0x254 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x7f0/0x2378 kernel/exit.c:961 do_group_exit+0x1d4/0x2ac kernel/exit.c:1102 get_signal+0x1440/0x1554 kernel/signal.c:3034 do_signal+0x23c/0x4dd0 arch/arm64/kernel/signal.c:1618 do_notify_resume+0xb0/0x270 arch/arm64/kernel/entry-common.c:152 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline] el0_svc+0xb8/0x164 arch/arm64/kernel/entry-common.c:880 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffff800087806858 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 3 locks held by kworker/u4:5/51: 2 locks held by getty/3181: #0: 61f0000011d0a8a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 96ff80008c54b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 2 locks held by syz-executor/3306: 3 locks held by kworker/u4:2/4340: 3 locks held by kworker/u4:11/5130: 2 locks held by kworker/u4:14/5134: #0: 6ff000000cc20948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3210 #1: ffff80008ee27c78 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3210 3 locks held by kworker/u4:15/5296: 2 locks held by syz.0.286/5972: 1 lock held by syz-executor/5993: 3 locks held by kworker/u4:12/6021: 2 locks held by kworker/u4:13/6022: 4 locks held by kworker/0:0/6124: #0: 4cf000000cc1a748 ((wq_completion)events){+.+.}-{0:0}, at: raw_spin_rq_lock_nested kernel/sched/core.c:636 [inline] #0: 4cf000000cc1a748 ((wq_completion)events){+.+.}-{0:0}, at: raw_spin_rq_lock kernel/sched/sched.h:1519 [inline] #0: 4cf000000cc1a748 ((wq_completion)events){+.+.}-{0:0}, at: rq_lock kernel/sched/sched.h:1841 [inline] #0: 4cf000000cc1a748 ((wq_completion)events){+.+.}-{0:0}, at: __schedule+0x2f0/0x33a4 kernel/sched/core.c:6865 #1: fff0000072d6c548 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x6c/0x6e8 kernel/sched/psi.c:933 #2: 15f000000dc5bd60 (&helper->damage_lock){....}-{3:3}, at: drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:374 [inline] #2: 15f000000dc5bd60 (&helper->damage_lock){....}-{3:3}, at: drm_fb_helper_damage_work+0xcc/0x574 drivers/gpu/drm/drm_fb_helper.c:403 #3: ffff800087852080 (stack_ring.lock){.-.-}-{3:3}, at: save_stack_info+0x40/0x138 mm/kasan/tags.c:113 1 lock held by rm/6145: 1 lock held by modprobe/6146: =============================================