INFO: task syz.3.669:6154 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.3.669 state:D stack:0 pid:6154 tgid:6152 ppid:3813 task_flags:0x40044c flags:0x00000018 Call trace: __switch_to+0x5e0/0xb70 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5510 [inline] __schedule+0x1e0c/0x38cc kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x1b4/0x274 kernel/sched/core.c:7326 schedule_timeout+0x68/0x1e4 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:100 [inline] __wait_for_common kernel/sched/completion.c:121 [inline] wait_for_common kernel/sched/completion.c:132 [inline] wait_for_completion+0x1b8/0x414 kernel/sched/completion.c:153 __synchronize_srcu+0x1c8/0x208 kernel/rcu/srcutree.c:1496 synchronize_srcu+0x668/0x8dc kernel/rcu/srcutree.c:-1 mmu_notifier_unregister+0x33c/0x444 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_vm_release+0x58/0x78 virt/kvm/kvm_main.c:1354 __fput+0x4ac/0x978 fs/file_table.c:512 ____fput+0x20/0x30 fs/file_table.c:540 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:1009 do_group_exit+0x1d4/0x2ac kernel/exit.c:1152 get_signal+0x13f8/0x1504 kernel/signal.c:3046 arch_do_signal_or_restart+0x23c/0x4b50 arch/arm64/kernel/signal.c:1665 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x88/0x188 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] arm64_syscall_exit_to_user_mode arch/arm64/kernel/entry-common.c:88 [inline] el0_svc+0x18c/0x240 arch/arm64/kernel/entry-common.c:737 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffff800087e93598 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffff800087e93598 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #0: ffff800087e93598 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x4c/0x188 kernel/locking/lockdep.c:6775 2 locks held by getty/3240: #0: 30f00000124a60a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: b6ff80008cbdb2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x314/0x11f8 drivers/tty/n_tty.c:2211 2 locks held by syz-executor/3369: 3 locks held by kworker/u4:7/3465: 3 locks held by kworker/u4:2/4374: 2 locks held by kworker/u4:8/5394: 3 locks held by kworker/u4:0/5640: #0: 06f00000122ba940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: 06f00000122ba940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x958/0x154c kernel/workqueue.c:3405 #1: ffff8000a0627ce8 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3298 [inline] #1: ffff8000a0627ce8 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x978/0x154c kernel/workqueue.c:3405 #2: ffff800088176fb8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 2 locks held by syz.2.670/6157: 3 locks held by kworker/u4:4/6164: #0: 79f00000122d0140 ((wq_completion)udp_tunnel_nic){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline] #0: 79f00000122d0140 ((wq_completion)udp_tunnel_nic){+.+.}-{0:0}, at: process_scheduled_works+0x958/0x154c kernel/workqueue.c:3405 #1: ffff8000a03b7ce8 ((work_completion)(&utn->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3298 [inline] #1: ffff8000a03b7ce8 ((work_completion)(&utn->work)){+.+.}-{0:0}, at: process_scheduled_works+0x978/0x154c kernel/workqueue.c:3405 #2: ffff800088176fb8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 1 lock held by syz-executor/6165: 3 locks held by kworker/u4:9/6167: 1 lock held by syz-executor/6171: 3 locks held by kworker/u4:11/6306: =============================================