INFO: task syz-executor:4964 blocked for more than 143 seconds. Not tainted 5.15.186-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack: 0 pid: 4964 ppid: 1 flags:0x00000009 Call trace: __switch_to+0x2f4/0x558 arch/arm64/kernel/process.c:521 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xe00/0x1c0c kernel/sched/core.c:6376 schedule+0x11c/0x1c8 kernel/sched/core.c:6459 wb_wait_for_completion+0x15c/0x2b0 fs/fs-writeback.c:191 sync_inodes_sb+0x188/0x824 fs/fs-writeback.c:2770 sync_filesystem+0x160/0x218 fs/sync.c:64 generic_shutdown_super+0x70/0x2f0 fs/super.c:448 kill_block_super+0x70/0xdc fs/super.c:1427 deactivate_locked_super+0xb8/0x13c fs/super.c:335 deactivate_super+0xf8/0x118 fs/super.c:366 cleanup_mnt+0x3a4/0x458 fs/namespace.c:1139 __cleanup_mnt+0x20/0x30 fs/namespace.c:1146 task_work_run+0x12c/0x1e0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] do_notify_resume+0x24b4/0x3128 arch/arm64/kernel/signal.c:949 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline] el0_svc+0xf0/0x1e0 arch/arm64/kernel/entry-common.c:609 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffff800014351360 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:311 2 locks held by getty/3813: #0: ffff0000d3cb7098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x40/0x50 drivers/tty/tty_ldsem.c:340 #1: ffff80001be0b2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2f0/0xf6c drivers/tty/n_tty.c:2158 1 lock held by syz-executor/4022: #0: ffff0001a10c6958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:475 [inline] #0: ffff0001a10c6958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1326 [inline] #0: ffff0001a10c6958 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1621 [inline] #0: ffff0001a10c6958 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x310/0x1c0c kernel/sched/core.c:6290 2 locks held by udevd/4027: 2 locks held by kworker/0:3/4078: 2 locks held by kworker/1:4/4093: #0: ffff0000c0021938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001fb27c00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 4 locks held by kworker/u4:8/4172: #0: ffff0000c21e0138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x678/0x1140 kernel/workqueue.c:2283 #1: ffff80001fef7c00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6b8/0x1140 kernel/workqueue.c:2285 #2: ffff0000d79b8650 (sb_internal#5){.+.+}-{0:0}, at: xfs_bmapi_convert_delalloc+0x1bc/0xca0 fs/xfs/libxfs/xfs_bmap.c:4573 #3: ffff0001a10c6958 (&rq->__lock){-.-.}-{2:2}, at: mrupdate_nested fs/xfs/mrlock.h:36 [inline] #3: ffff0001a10c6958 (&rq->__lock){-.-.}-{2:2}, at: xfs_ilock+0x264/0x474 fs/xfs/xfs_inode.c:201 1 lock held by udevd/4202: 1 lock held by udevd/4205: 1 lock held by udevd/4276: 1 lock held by udevd/4277: 2 locks held by udevd/4278: #0: ffff0000cbd41118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xdc/0x6ac block/bdev.c:915 #1: ffff0000cbf2b468 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0xa4/0x978 drivers/block/loop.c:1366 1 lock held by udevd/4292: #0: ffff8000144769f0 (kernfs_rwsem){++++}-{3:3}, at: kernfs_dop_revalidate+0x88/0x470 fs/kernfs/dir.c:1090 1 lock held by udevd/4699: 2 locks held by syz-executor/4964: #0: ffff0000d79b80e0 (&type->s_umount_key#72){++++}-{3:3}, at: deactivate_super+0xf0/0x118 fs/super.c:365 #1: ffff0000cbf787d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline] #1: ffff0000cbf787d8 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x170/0x824 fs/fs-writeback.c:2768 1 lock held by syz-executor/5796: #0: ffff800014355e28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] #0: ffff800014355e28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x248/0x5e0 kernel/rcu/tree_exp.h:845 1 lock held by syz-executor/6097: #0: ffff800014355e28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x248/0x5e0 kernel/rcu/tree_exp.h:845 4 locks held by syz.8.850/8113: #0: ffff0000c9d55098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_write+0x40/0x50 drivers/tty/tty_ldsem.c:366 #1: ffff0000d69f6098 (&tty->ldisc_sem/1){+.+.}-{0:0}, at: ldsem_down_write_nested+0x48/0x5c drivers/tty/tty_ldsem.c:427 #2: ffff0000f8d7e0b0 (&gsm->mutex){+.+.}-{3:3}, at: gsm_cleanup_mux+0xb4/0x720 drivers/tty/n_gsm.c:2448 #3: ffff0001a10e7958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:475 [inline] #3: ffff0001a10e7958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1326 [inline] #3: ffff0001a10e7958 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1621 [inline] #3: ffff0001a10e7958 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x310/0x1c0c kernel/sched/core.c:6290 2 locks held by dhcpcd-run-hook/8165: =============================================