INFO: task syz.8.340:5787 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.8.340 state:D stack:0 pid:5787 tgid:5786 ppid:5467 task_flags:0x40054c flags:0x00000019 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 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x7f8/0x2378 kernel/exit.c:971 do_group_exit+0x1d4/0x2ac kernel/exit.c:1112 get_signal+0x1440/0x154c kernel/signal.c:3034 arch_do_signal_or_restart+0x23c/0x4bac arch/arm64/kernel/signal.c:1619 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline] exit_to_user_mode_loop+0x88/0x188 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: ffff800087a86d08 (rcu_read_lock){....}-{1:3}, at: __ll_sc_atomic64_fetch_or arch/arm64/include/asm/atomic_ll_sc.h:-1 [inline] #0: ffff800087a86d08 (rcu_read_lock){....}-{1:3}, at: arch_atomic64_fetch_or arch/arm64/include/asm/atomic.h:86 [inline] #0: ffff800087a86d08 (rcu_read_lock){....}-{1:3}, at: raw_atomic64_fetch_or include/linux/atomic/atomic-arch-fallback.h:3816 [inline] #0: ffff800087a86d08 (rcu_read_lock){....}-{1:3}, at: raw_atomic_long_fetch_or include/linux/atomic/atomic-long.h:1090 [inline] #0: ffff800087a86d08 (rcu_read_lock){....}-{1:3}, at: arch_test_and_set_bit include/asm-generic/bitops/atomic.h:42 [inline] #0: ffff800087a86d08 (rcu_read_lock){....}-{1:3}, at: test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:72 [inline] #0: ffff800087a86d08 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x0/0x44 kernel/sched/sched.h:3748 3 locks held by udevd/3145: 2 locks held by getty/3200: #0: 13f00000123668a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 43ff80008c80b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x308/0x1234 drivers/tty/n_tty.c:2211 1 lock held by sshd-session/3333: 2 locks held by syz-executor/3334: 3 locks held by kworker/u4:3/4376: 3 locks held by kworker/u4:0/4624: 3 locks held by kworker/u4:12/4846: 3 locks held by kworker/u4:14/5352: #0: 23f000000cc26d48 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a10 kernel/workqueue.c:3231 #1: ffff80008f357c88 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x854/0x1a10 kernel/workqueue.c:3231 #2: ffff800087db21c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 2 locks held by syz.7.341/5792: 2 locks held by syz-executor/5807: #0: ffff800087962108 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_lock_acquire+0x18/0x54 include/linux/srcu.h:184 #1: ffff800087db21c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #1: ffff800087db21c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #1: ffff800087db21c0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x758/0x17b8 net/core/rtnetlink.c:4071 8 locks held by syz-executor/5812: 3 locks held by kworker/u4:16/5826: 1 lock held by dhcpcd-run-hook/5913: =============================================