INFO: task syz-executor:4625 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:4625 ppid:1 flags:0x00000409 Call trace: __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5246 [inline] __schedule+0xdb4/0x1a6c kernel/sched/core.c:6563 schedule+0xc4/0x170 kernel/sched/core.c:6639 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698 __mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 lmLogClose+0xb4/0x4a0 fs/jfs/jfs_logmgr.c:1444 jfs_umount+0x240/0x324 fs/jfs/jfs_umount.c:116 jfs_put_super+0x90/0x18c fs/jfs/super.c:194 generic_shutdown_super+0x138/0x32c fs/super.c:501 kill_block_super+0x78/0xe0 fs/super.c:1470 deactivate_locked_super+0xb4/0x128 fs/super.c:332 deactivate_super+0xe4/0x104 fs/super.c:363 cleanup_mnt+0x3a8/0x430 fs/namespace.c:1191 __cleanup_mnt+0x20/0x30 fs/namespace.c:1198 task_work_run+0x1f4/0x280 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 INFO: task syz-executor:4693 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:4693 ppid:1 flags:0x00000409 Call trace: __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5246 [inline] __schedule+0xdb4/0x1a6c kernel/sched/core.c:6563 schedule+0xc4/0x170 kernel/sched/core.c:6639 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698 __mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 lmLogClose+0xb4/0x4a0 fs/jfs/jfs_logmgr.c:1444 jfs_umount+0x240/0x324 fs/jfs/jfs_umount.c:116 jfs_put_super+0x90/0x18c fs/jfs/super.c:194 generic_shutdown_super+0x138/0x32c fs/super.c:501 kill_block_super+0x78/0xe0 fs/super.c:1470 deactivate_locked_super+0xb4/0x128 fs/super.c:332 deactivate_super+0xe4/0x104 fs/super.c:363 cleanup_mnt+0x3a8/0x430 fs/namespace.c:1191 __cleanup_mnt+0x20/0x30 fs/namespace.c:1198 task_work_run+0x1f4/0x280 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 INFO: task syz-executor:4744 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:4744 ppid:1 flags:0x00000409 Call trace: __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5246 [inline] __schedule+0xdb4/0x1a6c kernel/sched/core.c:6563 schedule+0xc4/0x170 kernel/sched/core.c:6639 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6698 __mutex_lock_common+0xb20/0x1f3c kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 lmLogClose+0xb4/0x4a0 fs/jfs/jfs_logmgr.c:1444 jfs_umount+0x240/0x324 fs/jfs/jfs_umount.c:116 jfs_put_super+0x90/0x18c fs/jfs/super.c:194 generic_shutdown_super+0x138/0x32c fs/super.c:501 kill_block_super+0x78/0xe0 fs/super.c:1470 deactivate_locked_super+0xb4/0x128 fs/super.c:332 deactivate_super+0xe4/0x104 fs/super.c:363 cleanup_mnt+0x3a8/0x430 fs/namespace.c:1191 __cleanup_mnt+0x20/0x30 fs/namespace.c:1198 task_work_run+0x1f4/0x280 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffff800015557db0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xc48 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffff8000155585d0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xc48 kernel/rcu/tasks.h:517 1 lock held by khungtaskd/28: #0: ffff800015557440 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349 1 lock held by udevd/3939: 2 locks held by getty/4082: #0: ffff0000d62ce098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff800020a6e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2e8/0xfa8 drivers/tty/n_tty.c:2198 2 locks held by syz-executor/4328: #0: ffff0000f555a0e0 (&type->s_umount_key#51){++++}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362 #1: ffff800015941c28 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x4a0 fs/jfs/jfs_logmgr.c:1444 1 lock held by syz.0.59/4613: #0: ffff0000f555a0e0 (&type->s_umount_key#51){++++}-{3:3}, at: iterate_supers+0xa8/0x1d4 fs/super.c:755 2 locks held by syz-executor/4625: #0: ffff0000d75720e0 (&type->s_umount_key#51){++++}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362 #1: ffff800015941c28 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x4a0 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/4693: #0: ffff0000d00560e0 (&type->s_umount_key#51){++++}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362 #1: ffff800015941c28 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x4a0 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/4744: #0: ffff0000c4ef60e0 (&type->s_umount_key#51){++++}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362 #1: ffff800015941c28 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x4a0 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/4797: #0: ffff000109b680e0 (&type->s_umount_key#51){++++}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362 #1: ffff800015941c28 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x4a0 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/5009: #0: ffff00010580a0e0 (&type->s_umount_key#51){++++}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362 #1: ffff800015941c28 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x4a0 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/5064: #0: ffff00010d7f40e0 (&type->s_umount_key#51){++++}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362 #1: ffff800015941c28 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x4a0 fs/jfs/jfs_logmgr.c:1444 2 locks held by syz-executor/5470: #0: ffff00010d8ae0e0 (&type->s_umount_key#51){++++}-{3:3}, at: deactivate_super+0xdc/0x104 fs/super.c:362 #1: ffff800015941c28 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xb4/0x4a0 fs/jfs/jfs_logmgr.c:1444 2 locks held by udevd/5541: 2 locks held by kworker/u4:11/5915: =============================================