INFO: task syz.6.254:5242 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.6.254 state:D stack:0 pid:5242 tgid:5242 ppid:4974 task_flags:0x400040 flags:0x00000011 Call trace: __switch_to+0x584/0xb00 arch/arm64/kernel/process.c:742 (T) context_switch kernel/sched/core.c:5256 [inline] __schedule+0x200c/0x3428 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0xac/0x27c kernel/sched/core.c:6960 schedule_timeout+0x68/0x1ec kernel/time/sleep_timeout.c:75 do_wait_for_common+0x28c/0x440 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:1518 synchronize_srcu+0x3d0/0x4f8 kernel/rcu/srcutree.c:-1 mmu_notifier_unregister+0x320/0x428 mm/mmu_notifier.c:831 kvm_destroy_vm virt/kvm/kvm_main.c:1296 [inline] kvm_put_kvm+0x698/0xbe0 virt/kvm/kvm_main.c:1354 kvm_vm_release+0x58/0x78 virt/kvm/kvm_main.c:1377 __fput+0x4ac/0x978 fs/file_table.c:468 ____fput+0x20/0x58 fs/file_table.c:496 task_work_run+0x1b8/0x250 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0x110/0x188 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] exit_to_user_mode_prepare_legacy include/linux/irq-entry-common.h:242 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline] el0_svc+0x17c/0x238 arch/arm64/kernel/entry-common.c:725 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743 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: ffff800087a66a08 (rcu_read_lock){....}-{1:3}, at: __ll_sc_atomic64_fetch_or arch/arm64/include/asm/atomic_ll_sc.h:-1 [inline] #0: ffff800087a66a08 (rcu_read_lock){....}-{1:3}, at: arch_atomic64_fetch_or arch/arm64/include/asm/atomic.h:86 [inline] #0: ffff800087a66a08 (rcu_read_lock){....}-{1:3}, at: raw_atomic64_fetch_or include/linux/atomic/atomic-arch-fallback.h:3816 [inline] #0: ffff800087a66a08 (rcu_read_lock){....}-{1:3}, at: raw_atomic_long_fetch_or include/linux/atomic/atomic-long.h:1090 [inline] #0: ffff800087a66a08 (rcu_read_lock){....}-{1:3}, at: arch_test_and_set_bit include/asm-generic/bitops/atomic.h:42 [inline] #0: ffff800087a66a08 (rcu_read_lock){....}-{1:3}, at: test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:72 [inline] #0: ffff800087a66a08 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x0/0x44 kernel/sched/sched.h:3748 2 locks held by getty/3190: #0: a7f000001231e8a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: d5ff80008c7fb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x308/0x1234 drivers/tty/n_tty.c:2211 2 locks held by syz-executor/3324: 3 locks held by kworker/u4:4/3377: 3 locks held by kworker/u4:9/3625: 3 locks held by kworker/u4:1/4184: 2 locks held by kworker/u4:6/4495: #0: 0af000000cc26948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a10 kernel/workqueue.c:3231 #1: ffff80008fe77c88 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a10 kernel/workqueue.c:3231 3 locks held by kworker/u4:8/4577: 3 locks held by kworker/u4:0/4831: 2 locks held by kworker/u4:14/5147: #0: 0af000000cc26948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a10 kernel/workqueue.c:3231 #1: ffff80008ead7c88 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a10 kernel/workqueue.c:3231 2 locks held by syz.7.253/5243: 3 locks held by kworker/u4:11/5283: 2 locks held by dhcpcd-run-hook/5404: 3 locks held by kworker/u4:15/5405: 3 locks held by modprobe/5409: 1 lock held by modprobe/5410: =============================================