INFO: task kworker/u4:12:8269 blocked for more than 143 seconds. Not tainted 6.1.107-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:12 state:D stack:0 pid:8269 ppid:2 flags:0x00000008 Workqueue: writeback wb_workfn (flush-7:2) Call trace: __switch_to+0x320/0x754 arch/arm64/kernel/process.c:553 context_switch kernel/sched/core.c:5241 [inline] __schedule+0xef4/0x1d44 kernel/sched/core.c:6558 schedule+0xc4/0x170 kernel/sched/core.c:6634 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6693 __mutex_lock_common+0xbd8/0x21a0 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 jfs_commit_inode+0x1d4/0x4f8 fs/jfs/inode.c:102 jfs_write_inode+0x128/0x200 fs/jfs/inode.c:132 write_inode fs/fs-writeback.c:1460 [inline] __writeback_single_inode+0x614/0x1770 fs/fs-writeback.c:1677 writeback_sb_inodes+0x978/0x1718 fs/fs-writeback.c:1903 __writeback_inodes_wb+0x110/0x39c fs/fs-writeback.c:1974 wb_writeback+0x428/0x1130 fs/fs-writeback.c:2079 wb_check_background_flush fs/fs-writeback.c:2145 [inline] wb_do_writeback fs/fs-writeback.c:2233 [inline] wb_workfn+0xc98/0x1034 fs/fs-writeback.c:2260 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Showing all locks held in the system: 4 locks held by kworker/u4:0/9: #0: ffff0000c2e55938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265 #1: ffff80001d107c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267 #2: ffff0000db4d40e0 (&type->s_umount_key#86){++++}-{3:3}, at: trylock_super+0x28/0xf8 fs/super.c:415 #3: ffff0000e154b948 (&jfs_ip->commit_mutex){+.+.}-{3:3}, at: jfs_commit_inode+0x1d4/0x4f8 fs/jfs/inode.c:102 1 lock held by rcu_tasks_kthre/12: #0: ffff800015b950b0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffff800015b958b0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x44/0xcf4 kernel/rcu/tasks.h:517 5 locks held by kworker/0:1/14: #0: ffff0001b3d0e158 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:537 [inline] #0: ffff0001b3d0e158 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1355 [inline] #0: ffff0001b3d0e158 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1645 [inline] #0: ffff0001b3d0e158 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x2c4/0x1d44 kernel/sched/core.c:6474 #1: ffff0001b3cfab88 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3c0/0x618 kernel/sched/psi.c:1001 #2: ffff0001b3cfb758 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x108/0x214 kernel/time/timer.c:999 #3: ffff80001cdc3a48 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x80/0x4b4 lib/debugobjects.c:697 #4: ffff80001cdcdc00 (&obj_hash[i].lock){-.-.}-{2:2}, at: __debug_check_no_obj_freed lib/debugobjects.c:967 [inline] #4: ffff80001cdcdc00 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_check_no_obj_freed+0x14c/0x478 lib/debugobjects.c:1008 1 lock held by khungtaskd/28: #0: ffff800015b94ee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349 2 locks held by getty/4050: #0: ffff0000d6504098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80001efb02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x414/0x1214 drivers/tty/n_tty.c:2198 4 locks held by kworker/u4:12/8269: #0: ffff0000c2e55938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265 #1: ffff800021697c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267 #2: ffff0000f9cb80e0 (&type->s_umount_key#86){++++}-{3:3}, at: trylock_super+0x28/0xf8 fs/super.c:415 #3: ffff0000ded170c8 (&jfs_ip->commit_mutex){+.+.}-{3:3}, at: jfs_commit_inode+0x1d4/0x4f8 fs/jfs/inode.c:102 4 locks held by kworker/u4:14/8274: #0: ffff0000c2e55938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265 #1: ffff800022a37c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267 #2: ffff0000d54300e0 (&type->s_umount_key#86){++++}-{3:3}, at: trylock_super+0x28/0xf8 fs/super.c:415 #3: ffff0000e16bb008 (&jfs_ip->commit_mutex){+.+.}-{3:3}, at: jfs_commit_inode+0x1d4/0x4f8 fs/jfs/inode.c:102 4 locks held by kworker/u4:17/8280: #0: ffff0000c2e55938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x664/0x1404 kernel/workqueue.c:2265 #1: ffff800022817c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6a8/0x1404 kernel/workqueue.c:2267 #2: ffff0000ea2a20e0 (&type->s_umount_key#86){++++}-{3:3}, at: trylock_super+0x28/0xf8 fs/super.c:415 #3: ffff0000e16bf0c8 (&jfs_ip->commit_mutex){+.+.}-{3:3}, at: jfs_commit_inode+0x1d4/0x4f8 fs/jfs/inode.c:102 4 locks held by syz.2.1717/9334: 4 locks held by syz.1.1778/9503: 4 locks held by syz.3.1857/10050: 4 locks held by syz.0.1896/10212: 1 lock held by syz.3.2027/10747: 2 locks held by syz.1.2038/10776: =============================================