INFO: task syz-executor.0:4886 blocked for more than 143 seconds. Not tainted 6.2.0-rc7-syzkaller-00135-g2d3827b3f393 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:0 pid:4886 ppid:1 flags:0x00000009 Call trace: __switch_to+0x210/0x424 arch/arm64/kernel/process.c:556 context_switch kernel/sched/core.c:5293 [inline] __schedule+0x6a4/0xb34 kernel/sched/core.c:6606 schedule+0x64/0xa4 kernel/sched/core.c:6682 schedule_timeout+0x60/0x194 kernel/time/timer.c:2143 do_wait_for_common+0xf4/0x184 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x48/0x60 kernel/sched/completion.c:138 __flush_workqueue+0x29c/0x6a0 kernel/workqueue.c:2861 drain_workqueue+0x98/0x1e0 kernel/workqueue.c:2974 destroy_workqueue+0x4c/0x4c8 kernel/workqueue.c:4418 btrfs_destroy_workqueue+0x28/0x284 fs/btrfs/async-thread.c:327 btrfs_stop_all_workers+0x20/0x110 fs/btrfs/disk-io.c:2175 close_ctree+0x2f4/0x668 fs/btrfs/disk-io.c:4799 btrfs_put_super+0x20/0x30 fs/btrfs/super.c:81 generic_shutdown_super+0x94/0x198 fs/super.c:492 kill_anon_super+0x24/0x44 fs/super.c:1086 btrfs_kill_super+0x24/0x3c fs/btrfs/super.c:2132 deactivate_locked_super+0x70/0xe8 fs/super.c:332 deactivate_super+0xd0/0xd4 fs/super.c:363 cleanup_mnt+0x180/0x1bc fs/namespace.c:1291 __cleanup_mnt+0x20/0x30 fs/namespace.c:1298 task_work_run+0x100/0x148 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x165c/0x2628 arch/arm64/kernel/signal.c:1302 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+0x9c/0x14c arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/11: #0: ffff80000d4955c8 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x448 kernel/rcu/tasks.h:507 1 lock held by rcu_tasks_trace/12: #0: ffff80000d495c18 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x3c/0x448 kernel/rcu/tasks.h:507 1 lock held by khungtaskd/27: #0: ffff80000d4954a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:324 2 locks held by kworker/u4:3/1005: #0: ffff0000c98f7538 ((wq_completion)btrfs-fixup){+.+.}-{0:0}, at: process_one_work+0x274/0x9d0 kernel/workqueue.c:2262 #1: ffff800014533d80 ((work_completion)(&work->normal_work)){+.+.}-{0:0}, at: process_one_work+0x2a0/0x9d0 kernel/workqueue.c:2264 2 locks held by kworker/u4:4/1096: #0: ffff0001feff0298 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2c/0x44 kernel/sched/core.c:537 #1: ffff0001fefdeb88 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x23c/0x384 kernel/sched/psi.c:964 2 locks held by getty/4091: #0: ffff0000c8090098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x28/0x58 drivers/tty/tty_ldisc.c:244 #1: ffff80000f6a62f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x28c/0xbc4 drivers/tty/n_tty.c:2177 1 lock held by syz-executor.0/4886: #0: ffff0000c99e40e0 (&type->s_umount_key#49){+.+.}-{3:3}, at: deactivate_super+0xc8/0xd4 fs/super.c:362 =============================================