INFO: task kworker/u8:8:4993 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:8 state:D stack:0 pid:4993 tgid:4993 ppid:2 task_flags:0x4208060 flags:0x00000010 Workqueue: writeback wb_workfn (flush-7:0) Call trace: __switch_to+0x418/0x87c arch/arm64/kernel/process.c:741 (T) context_switch kernel/sched/core.c:5325 [inline] __schedule+0x13b0/0x2864 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xb4/0x230 kernel/sched/core.c:7026 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7083 __mutex_lock_common+0xd04/0x2678 kernel/locking/mutex.c:676 __mutex_lock kernel/locking/mutex.c:760 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812 jfs_commit_inode+0x19c/0x498 fs/jfs/inode.c:108 jfs_write_inode+0x128/0x1f8 fs/jfs/inode.c:138 write_inode fs/fs-writeback.c:1564 [inline] __writeback_single_inode+0x5ac/0x13e8 fs/fs-writeback.c:1784 writeback_sb_inodes+0x55c/0xe40 fs/fs-writeback.c:2015 __writeback_inodes_wb+0xec/0x228 fs/fs-writeback.c:2086 wb_writeback+0x3e0/0xd70 fs/fs-writeback.c:2197 wb_check_old_data_flush fs/fs-writeback.c:2301 [inline] wb_do_writeback fs/fs-writeback.c:2354 [inline] wb_workfn+0xa08/0xdc0 fs/fs-writeback.c:2382 process_one_work+0x7e8/0x155c kernel/workqueue.c:3263 process_scheduled_works kernel/workqueue.c:3346 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3427 kthread+0x5fc/0x75c kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844 Showing all locks held in the system: 4 locks held by kworker/u8:0/12: #0: ffff0000c1f7b148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff800097a57be0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff0000d9e880e0 (&type->s_umount_key#54){.+.+}-{4:4}, at: super_trylock_shared+0x24/0xdc fs/super.c:562 #3: ffff0000e264b8b8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x19c/0x498 fs/jfs/inode.c:108 4 locks held by kworker/u8:1/15: #0: ffff0000c1f7b148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff800097a87be0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff0000d40c20e0 (&type->s_umount_key#54){.+.+}-{4:4}, at: super_trylock_shared+0x24/0xdc fs/super.c:562 #3: ffff0000f1a4efa8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x19c/0x498 fs/jfs/inode.c:108 1 lock held by khungtaskd/32: #0: ffff80008f76b5a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 4 locks held by kworker/u8:4/208: #0: ffff0000c1f7b148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff80009beb7be0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff0000d9e360e0 (&type->s_umount_key#54){.+.+}-{4:4}, at: super_trylock_shared+0x24/0xdc fs/super.c:562 #3: ffff0000f1962f90 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x19c/0x498 fs/jfs/inode.c:108 4 locks held by kworker/u8:5/729: #0: ffff0000c1f7b148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff80009c6f7be0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff0000f00e60e0 (&type->s_umount_key#54){.+.+}-{4:4}, at: super_trylock_shared+0x24/0xdc fs/super.c:562 #3: ffff0000e27001c8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x19c/0x498 fs/jfs/inode.c:108 4 locks held by kworker/u8:6/2147: #0: ffff0000c1f7b148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff8000a0437be0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff0000ee8920e0 (&type->s_umount_key#54){.+.+}-{4:4}, at: super_trylock_shared+0x24/0xdc fs/super.c:562 #3: ffff0000f1966fa8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x19c/0x498 fs/jfs/inode.c:108 4 locks held by kworker/u8:7/4827: #0: ffff0000c1f7b148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff8000a2327be0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff0000f82740e0 (&type->s_umount_key#54){.+.+}-{4:4}, at: super_trylock_shared+0x24/0xdc fs/super.c:562 #3: ffff0000f94481c8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x19c/0x498 fs/jfs/inode.c:108 4 locks held by kworker/u8:8/4993: #0: ffff0000c1f7b148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff80009c597be0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff0000c8a940e0 (&type->s_umount_key#54){.+.+}-{4:4}, at: super_trylock_shared+0x24/0xdc fs/super.c:562 #3: ffff0000f1a4af90 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x19c/0x498 fs/jfs/inode.c:108 1 lock held by klogd/6181: 2 locks held by getty/6334: #0: ffff0000d76a80a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff8000991842f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa4 drivers/tty/n_tty.c:2222 4 locks held by syz.0.17/6749: 4 locks held by syz.1.18/6771: 4 locks held by syz.2.19/6794: 4 locks held by syz.3.20/6821: 4 locks held by syz.4.21/6853: 4 locks held by syz.5.22/6885: 4 locks held by kworker/u8:9/6901: #0: ffff0000c1f7b148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff8000a1457be0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff0000c78be0e0 (&type->s_umount_key#54){.+.+}-{4:4}, at: super_trylock_shared+0x24/0xdc fs/super.c:562 #3: ffff0000e24fb8b8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x19c/0x498 fs/jfs/inode.c:108 4 locks held by syz.6.23/6918: 4 locks held by syz.7.24/6956: 4 locks held by kworker/u8:11/6978: #0: ffff0000c1f7b148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff8000a1357be0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff0000d5a4c0e0 (&type->s_umount_key#54){.+.+}-{4:4}, at: super_trylock_shared+0x24/0xdc fs/super.c:562 #3: ffff0000e27041e0 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x19c/0x498 fs/jfs/inode.c:108 4 locks held by syz.8.25/6989: 4 locks held by syz.9.26/7023: 4 locks held by kworker/u8:13/7048: #0: ffff0000c1f7b148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x63c/0x155c kernel/workqueue.c:3237 #1: ffff80009cea7be0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6d4/0x155c kernel/workqueue.c:3237 #2: ffff0000c65de0e0 (&type->s_umount_key#54){.+.+}-{4:4}, at: super_trylock_shared+0x24/0xdc fs/super.c:562 #3: ffff0000f9680af0 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x19c/0x498 fs/jfs/inode.c:108 2 locks held by syz.0.50/7077: =============================================