INFO: task syz.8.510:6201 blocked for more than 430 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.8.510 state:D stack:0 pid:6201 tgid:6201 ppid:5942 task_flags:0x400040 flags:0x00000019 Call trace: __switch_to+0x584/0xb20 arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1eec/0x33a4 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xac/0x27c kernel/sched/core.c:7058 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:1444 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+0x6a0/0xfa8 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] do_notify_resume+0x1bc/0x270 arch/arm64/kernel/entry-common.c:155 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline] el0_svc+0xb8/0x164 arch/arm64/kernel/entry-common.c:880 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 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: ffff800087876d18 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 2 locks held by getty/3183: #0: d8f0000011c4e8a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 69ff80008c5cb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 4 locks held by sshd-session/3311: 2 locks held by syz-executor/3312: 3 locks held by kworker/u4:8/4047: 3 locks held by kworker/u4:9/4048: 2 locks held by kworker/u4:2/4710: 3 locks held by kworker/u4:1/5304: 2 locks held by kworker/u4:6/5320: #0: d8f000000cc20948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3210 #1: ffff80008cfe7c78 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3210 2 locks held by kworker/u4:10/5323: #0: d8f000000cc20948 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7c8/0x1a18 kernel/workqueue.c:3210 #1: ffff8000a0397c78 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x1a18 kernel/workqueue.c:3210 3 locks held by kworker/u4:14/6073: 2 locks held by syz.7.509/6192: 3 locks held by kworker/u4:13/6328: 3 locks held by kworker/u4:16/6363: 3 locks held by dhcpcd-run-hook/6377: #0: 09f00000122a2d90 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline] #0: 09f00000122a2d90 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x7c/0x1a30 mm/mmap.c:1727 #1: 74f00000122a7390 (&mm->mmap_lock/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:405 [inline] #1: 74f00000122a7390 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x164/0x1a30 mm/mmap.c:1734 #2: 10f0000010033d70 (&mapping->i_mmap_rwsem){++++}-{4:4}, at: raw_spin_rq_lock_nested kernel/sched/core.c:636 [inline] #2: 10f0000010033d70 (&mapping->i_mmap_rwsem){++++}-{4:4}, at: raw_spin_rq_lock kernel/sched/sched.h:1519 [inline] #2: 10f0000010033d70 (&mapping->i_mmap_rwsem){++++}-{4:4}, at: rq_lock kernel/sched/sched.h:1841 [inline] #2: 10f0000010033d70 (&mapping->i_mmap_rwsem){++++}-{4:4}, at: __schedule+0x2f0/0x33a4 kernel/sched/core.c:6865 2 locks held by modprobe/6385: 2 locks held by modprobe/6386: ============================================= INFO: task syz.8.510:6201 blocked for more than 451 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.8.510 state:D stack:0 pid:6201 tgid:6201 ppid:5942 task_flags:0x400040 flags:0x00000019 Call trace: __switch_to+0x584/0xb20 arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1eec/0x33a4 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xac/0x27c kernel/sched/core.c:7058 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:1444 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+0x6a0/0xfa8 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] do_notify_resume+0x1bc/0x270 arch/arm64/kernel/entry-common.c:155 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline] el0_svc+0xb8/0x164 arch/arm64/kernel/entry-common.c:880 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 Showing all locks held in the system: 1 lock held by pr/ttyAMA-1/26: 1 lock held by khungtaskd/27: #0: ffff800087876d18 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 3 locks held by kworker/u4:3/42: 1 lock held by klogd/3118: 1 lock held by dhcpcd/3155: 2 locks held by getty/3183: #0: d8f0000011c4e8a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: 69ff80008c5cb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x310/0x12b8 drivers/tty/n_tty.c:2222 3 locks held by kworker/u4:7/3835: 2 locks held by kworker/u4:6/5320: 3 locks held by kworker/u4:11/5338: 2 locks held by syz.7.509/6192: 3 locks held by kworker/u4:0/6283: =============================================