INFO: task kworker/u4:1:136 blocked for more than 143 seconds. Not tainted 5.15.108-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:1 state:D stack: 0 pid: 136 ppid: 2 flags:0x00000008 Workqueue: events_unbound io_ring_exit_work Call trace: __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518 context_switch kernel/sched/core.c:5026 [inline] __schedule+0xf10/0x1e38 kernel/sched/core.c:6372 schedule+0x11c/0x1c8 kernel/sched/core.c:6455 schedule_timeout+0xb8/0x344 kernel/time/timer.c:1860 do_wait_for_common+0x214/0x388 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+0x4c/0x64 kernel/sched/completion.c:138 io_ring_exit_work+0x4ec/0x126c io_uring/io_uring.c:9711 process_one_work+0x790/0x11b8 kernel/workqueue.c:2306 worker_thread+0x910/0x1034 kernel/workqueue.c:2453 kthread+0x37c/0x45c kernel/kthread.c:319 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 INFO: task kworker/u4:15:5401 blocked for more than 143 seconds. Not tainted 5.15.108-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:15 state:D stack: 0 pid: 5401 ppid: 2 flags:0x00000008 Workqueue: events_unbound io_ring_exit_work Call trace: __switch_to+0x308/0x5e8 arch/arm64/kernel/process.c:518 context_switch kernel/sched/core.c:5026 [inline] __schedule+0xf10/0x1e38 kernel/sched/core.c:6372 schedule+0x11c/0x1c8 kernel/sched/core.c:6455 schedule_timeout+0xb8/0x344 kernel/time/timer.c:1860 do_wait_for_common+0x214/0x388 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+0x4c/0x64 kernel/sched/completion.c:138 io_ring_exit_work+0x4ec/0x126c io_uring/io_uring.c:9711 process_one_work+0x790/0x11b8 kernel/workqueue.c:2306 worker_thread+0x910/0x1034 kernel/workqueue.c:2453 kthread+0x37c/0x45c kernel/kthread.c:319 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffff800014aa1660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:268 2 locks held by kworker/u4:1/136: #0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2279 #1: ffff800018f87c00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2281 2 locks held by kworker/u4:6/1700: 2 locks held by kworker/1:2/3271: 2 locks held by udevd/3585: 2 locks held by getty/3733: #0: ffff0000d39e3098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff800018da02e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1200 drivers/tty/n_tty.c:2147 1 lock held by syz-executor.0/4086: 2 locks held by syz-executor.4/4096: 2 locks held by kworker/u4:13/5398: 2 locks held by kworker/u4:15/5401: #0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2279 #1: ffff800025807c00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2281 2 locks held by kworker/1:16/7408: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2279 #1: ffff8000256b7c00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2281 2 locks held by kworker/1:19/7413: #0: ffff0000c0020d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x66c/0x11b8 kernel/workqueue.c:2279 #1: ffff8000256f7c00 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6ac/0x11b8 kernel/workqueue.c:2281 2 locks held by udevd/21037: 2 locks held by udevd/21038: #0: ffff0000d49da460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:377 #1: ffff0000d1dc78a0 (&type->i_mutex_dir_key#5/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline] #1: ffff0000d1dc78a0 (&type->i_mutex_dir_key#5/1){+.+.}-{3:3}, at: do_unlinkat+0x2cc/0x82c fs/namei.c:4260 3 locks held by udevd/21039: 1 lock held by udevd/21514: 5 locks held by syz-executor.1/23142: 1 lock held by syz-executor.5/23145: 2 locks held by syz-executor.3/23147: #0: ffff0000d734a098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff0000d734a130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: tty_write_lock drivers/tty/tty_io.c:964 [inline] #1: ffff0000d734a130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: do_tty_write drivers/tty/tty_io.c:984 [inline] #1: ffff0000d734a130 (&tty->atomic_write_lock){+.+.}-{3:3}, at: file_tty_write+0x364/0x758 drivers/tty/tty_io.c:1110 =============================================