INFO: task syz.0.347:6077 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.347 state:D stack:0 pid:6077 tgid:6077 ppid:5767 task_flags:0x400040 flags:0x00000019 Call trace: __switch_to+0x584/0xb20 arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1eec/0x33a4 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xac/0x27c kernel/sched/core.c:7026 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:1454 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+0x698/0xbe8 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 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xfc/0x178 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline] el0_svc+0x170/0x234 arch/arm64/kernel/entry-common.c:747 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 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: ffff800087957208 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 3 locks held by kworker/u4:6/2133: 2 locks held by getty/3195: #0: 78f00000120368a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 09ff80008c6db2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 4 locks held by sshd-session/3323: #0: fff0000072d6bd58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:638 [inline] #0: fff0000072d6bd58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1546 [inline] #0: fff0000072d6bd58 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1868 [inline] #0: fff0000072d6bd58 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2f0/0x33a4 kernel/sched/core.c:6833 #1: fff0000072d57588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x6c/0x6e8 kernel/sched/psi.c:933 #2: ffff80008c40a4e8 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x7c/0x51c lib/debugobjects.c:818 #3: fff0000072d57588 (psi_seq){-.-.}-{0:0}, at: psi_task_change+0x124/0x2d8 kernel/sched/psi.c:919 2 locks held by syz-executor/3324: 2 locks held by kworker/u4:3/3388: #0: 37f000000cc26948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3237 #1: ffff80008ffa7c88 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3237 2 locks held by kworker/u4:8/3472: #0: 37f000000cc26948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3237 #1: ffff8000a3ce7c88 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3237 3 locks held by kworker/u4:5/4004: 3 locks held by kworker/u4:0/4338: 2 locks held by kworker/u4:2/4848: #0: 37f000000cc26948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3237 #1: ffff80008f3d7c88 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3237 3 locks held by kworker/u4:1/5417: 3 locks held by kworker/u4:14/5562: 3 locks held by kworker/u4:7/5765: 2 locks held by syz.9.346/6076: 4 locks held by modprobe/6248: 2 locks held by modprobe/6249: 1 lock held by modprobe/6250: ============================================= INFO: task syz.0.347:6077 blocked for more than 451 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.347 state:D stack:0 pid:6077 tgid:6077 ppid:5767 task_flags:0x400040 flags:0x00000019 Call trace: __switch_to+0x584/0xb20 arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1eec/0x33a4 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xac/0x27c kernel/sched/core.c:7026 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:1454 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+0x698/0xbe8 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 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xfc/0x178 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline] el0_svc+0x170/0x234 arch/arm64/kernel/entry-common.c:747 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 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: ffff800087957208 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 2 locks held by getty/3195: #0: 78f00000120368a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 09ff80008c6db2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 3 locks held by kworker/u4:3/3388: 3 locks held by kworker/u4:4/3932: 2 locks held by kworker/u4:5/4004: 2 locks held by kworker/u4:2/4848: #0: 37f000000cc26948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3237 #1: ffff80008f3d7c88 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3237 3 locks held by kworker/u4:13/4971: 3 locks held by kworker/u4:11/5167: 3 locks held by kworker/u4:14/5562: 3 locks held by kworker/u4:7/5765: #0: fff0000072d6bd58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:638 [inline] #0: fff0000072d6bd58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1546 [inline] #0: fff0000072d6bd58 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1868 [inline] #0: fff0000072d6bd58 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2f0/0x33a4 kernel/sched/core.c:6833 #1: fff0000072d57588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x6c/0x6e8 kernel/sched/psi.c:933 #2: fff0000072d58e98 (&base->lock){-.-.}-{2:2}, at: lock_timer_base kernel/time/timer.c:1004 [inline] #2: fff0000072d58e98 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x5c8/0xe7c kernel/time/timer.c:1085 3 locks held by kworker/u4:15/5772: 3 locks held by kworker/u4:9/5931: 2 locks held by kworker/0:5/5992: #0: 46f000000cc1bb48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3237 #1: ffff80008f177c88 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3237 2 locks held by syz.9.346/6076: 1 lock held by modprobe/6255: =============================================