INFO: task syz.8.247:5622 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.8.247 state:D stack:0 pid:5622 tgid:5618 ppid:4948 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_close_sync+0xcc/0x1e8 fs/file_table.c:573 __do_sys_close fs/open.c:1589 [inline] __se_sys_close fs/open.c:1574 [inline] __arm64_sys_close+0x8c/0x13c fs/open.c:1574 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x90/0x238 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x180/0x2f4 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x58/0x74 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x234 arch/arm64/kernel/entry-common.c:746 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: ffff800087957348 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 2 locks held by kworker/u4:5/52: #0: 8af000000cc26948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3237 #1: ffff80008cc47c88 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3237 2 locks held by getty/3197: #0: 11f00000120368a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 60ff80008c6db2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 2 locks held by syz-executor/3321: 3 locks held by kworker/u4:2/3382: 2 locks held by kworker/0:4/3481: 3 locks held by kworker/u4:13/4317: 3 locks held by kworker/u4:1/4505: 3 locks held by kworker/u4:9/4642: 3 locks held by kworker/u4:15/4980: 3 locks held by kworker/u4:7/5134: 3 locks held by kworker/u4:11/5194: 2 locks held by kworker/u4:4/5482: 2 locks held by kworker/u4:6/5564: #0: 8af000000cc26948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3237 #1: ffff80008fbd7c88 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3237 2 locks held by syz.9.246/5623: 1 lock held by syz-executor/5645: 3 locks held by kworker/u4:8/5700: 2 locks held by modprobe/5786: 1 lock held by modprobe/5787: ============================================= INFO: task syz.8.247:5622 blocked for more than 451 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.8.247 state:D stack:0 pid:5622 tgid:5618 ppid:4948 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_close_sync+0xcc/0x1e8 fs/file_table.c:573 __do_sys_close fs/open.c:1589 [inline] __se_sys_close fs/open.c:1574 [inline] __arm64_sys_close+0x8c/0x13c fs/open.c:1574 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x90/0x238 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x180/0x2f4 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x58/0x74 arch/arm64/kernel/syscall.c:151 el0_svc+0x5c/0x234 arch/arm64/kernel/entry-common.c:746 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: ffff800087957348 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 3 locks held by kworker/u4:5/52: 2 locks held by getty/3197: #0: 11f00000120368a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 60ff80008c6db2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 2 locks held by kworker/u4:14/4321: #0: 8af000000cc26948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3237 #1: ffff80008f6e7c88 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3237 2 locks held by kworker/u4:1/4505: #0: 8af000000cc26948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3237 #1: ffff80008e917c88 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3237 3 locks held by kworker/u4:9/4642: 3 locks held by kworker/u4:12/4731: 3 locks held by kworker/u4:7/5134: 2 locks held by kworker/u4:11/5194: #0: 8af000000cc26948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3237 #1: ffff80008f047c88 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3237 3 locks held by kworker/u4:4/5482: 2 locks held by kworker/u4:6/5564: 2 locks held by syz.9.246/5623: 2 locks held by syz-executor/5642: 2 locks held by syz-executor/5645: 3 locks held by kworker/u4:8/5700: 3 locks held by kworker/u4:16/5788: 2 locks held by modprobe/5795: 4 locks held by modprobe/5796: =============================================