INFO: task syz.2.405:5201 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.2.405 state:D stack:0 pid:5201 tgid:5201 ppid:3913 task_flags:0x40004c flags:0x00000018 Call trace: __switch_to+0x5e0/0xb70 arch/arm64/kernel/process.c:810 (T) context_switch kernel/sched/core.c:5388 [inline] __schedule+0x2554/0x3828 kernel/sched/core.c:7189 __schedule_loop kernel/sched/core.c:7268 [inline] schedule+0xac/0x278 kernel/sched/core.c:7283 schedule_timeout+0x68/0x1ec kernel/time/sleep_timeout.c:75 do_wait_for_common+0x270/0x428 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+0x1b4/0x1f4 kernel/rcu/srcutree.c:1496 synchronize_srcu+0x668/0x8dc kernel/rcu/srcutree.c:-1 mmu_notifier_unregister+0x320/0x428 mm/mmu_notifier.c:877 kvm_destroy_vm virt/kvm/kvm_main.c:1276 [inline] kvm_put_kvm+0x69c/0xbbc virt/kvm/kvm_main.c:1331 kvm_vcpu_release+0x70/0x9c virt/kvm/kvm_main.c:4094 __fput+0x4ac/0x978 fs/file_table.c:510 ____fput+0x20/0x30 fs/file_table.c:538 task_work_run+0x1b8/0x250 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x890/0x23d8 kernel/exit.c:976 do_group_exit+0x288/0x2ac kernel/exit.c:1119 __do_sys_exit_group kernel/exit.c:1130 [inline] __se_sys_exit_group kernel/exit.c:1128 [inline] __arm64_sys_exit_group+0x40/0x48 kernel/exit.c:1128 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x94/0x1ec arch/arm64/kernel/syscall.c:49 el0_svc_common+0x120/0x2f4 arch/arm64/kernel/syscall.c:121 do_el0_svc+0x58/0x74 arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x238 arch/arm64/kernel/entry-common.c:740 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:759 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Showing all locks held in the system: 3 locks held by kworker/u4:1/21: 1 lock held by khungtaskd/26: #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: __ll_sc_atomic64_fetch_or arch/arm64/include/asm/atomic_ll_sc.h:-1 [inline] #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: arch_atomic64_fetch_or arch/arm64/include/asm/atomic.h:86 [inline] #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: raw_atomic64_fetch_or include/linux/atomic/atomic-arch-fallback.h:3816 [inline] #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: raw_atomic_long_fetch_or include/linux/atomic/atomic-long.h:1090 [inline] #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: arch_test_and_set_bit include/asm-generic/bitops/atomic.h:42 [inline] #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:72 [inline] #0: ffff800087db4518 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x0/0x44 kernel/sched/sched.h:3869 3 locks held by kworker/u4:6/2184: 2 locks held by getty/3235: #0: 35f000001276e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: bbff80008cb4b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x314/0x1214 drivers/tty/n_tty.c:2211 2 locks held by syz-executor/3365: 3 locks held by kworker/u4:0/3380: 2 locks held by kworker/u4:8/3922: #0: 07f000000d036540 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x804/0x1d5c kernel/workqueue.c:3288 #1: ffff80008e607cb8 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x890/0x1d5c kernel/workqueue.c:3288 3 locks held by kworker/u4:2/4658: 2 locks held by syz.3.406/5204: 2 locks held by kworker/u4:9/5212: 2 locks held by kworker/u4:10/5219: #0: 07f000000d036540 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x804/0x1d5c kernel/workqueue.c:3288 #1: ffff80008ec17cb8 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x890/0x1d5c kernel/workqueue.c:3288 3 locks held by kworker/u4:12/5354: #0: fff0000074d280e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:652 [inline] #0: fff0000074d280e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1624 [inline] #0: fff0000074d280e0 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1968 [inline] #0: fff0000074d280e0 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x364/0x3828 kernel/sched/core.c:7064 #1: fff0000074d13208 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x6c/0x6e8 kernel/sched/psi.c:933 #2: fff0000074d14b58 (&base->lock){-.-.}-{2:2}, at: lock_timer_base kernel/time/timer.c:1004 [inline] #2: fff0000074d14b58 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x5cc/0xe90 kernel/time/timer.c:1085 1 lock held by modprobe/5439: 1 lock held by modprobe/5440: =============================================