INFO: task kworker/u8:10:3700 blocked for more than 143 seconds. Not tainted 6.10.0-rc4-syzkaller-00301-g5f583a3162ff #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:10 state:D stack:22816 pid:3700 tgid:3700 ppid:2 flags:0x00004000 Workqueue: writeback wb_workfn (flush-7:4) Call Trace: context_switch kernel/sched/core.c:5408 [inline] __schedule+0xf15/0x5d00 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6837 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894 rwsem_down_write_slowpath kernel/locking/rwsem.c:1178 [inline] __down_write_common+0x950/0x13f0 kernel/locking/rwsem.c:1306 f2fs_down_write fs/f2fs/f2fs.h:2170 [inline] f2fs_balance_fs+0x621/0x7b0 fs/f2fs/segment.c:440 f2fs_write_inode+0x513/0x1060 fs/f2fs/inode.c:799 write_inode fs/fs-writeback.c:1497 [inline] __writeback_single_inode+0xb36/0xf90 fs/fs-writeback.c:1716 writeback_sb_inodes+0x611/0x1150 fs/fs-writeback.c:1947 __writeback_inodes_wb+0xff/0x2e0 fs/fs-writeback.c:2018 wb_writeback+0x721/0xb50 fs/fs-writeback.c:2129 wb_check_background_flush fs/fs-writeback.c:2199 [inline] wb_do_writeback fs/fs-writeback.c:2287 [inline] wb_workfn+0x8c4/0xf40 fs/fs-writeback.c:2314 process_one_work+0x9fb/0x1b60 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8dbb1920 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8dbb1920 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8dbb1920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614 4 locks held by kworker/u8:10/3700: #0: ffff8880196bb148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x12bf/0x1b60 kernel/workqueue.c:3206 #1: ffffc9000b7a7d80 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x957/0x1b60 kernel/workqueue.c:3207 #2: ffff88802faa60e0 (&type->s_umount_key#92){++++}-{3:3}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:562 #3: ffff8880780dd2a0 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2170 [inline] #3: ffff8880780dd2a0 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x621/0x7b0 fs/f2fs/segment.c:440 2 locks held by getty/4836: #0: ffff88802b10e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2211 2 locks held by syz-fuzzer/5088: 3 locks held by kworker/0:4/5158: #0: ffff888015480948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12bf/0x1b60 kernel/workqueue.c:3206 #1: ffffc900039afd80 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x957/0x1b60 kernel/workqueue.c:3207 #2: ffffffff8dbbd0b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:323 3 locks held by kworker/1:3/5159: 6 locks held by syz-executor.4/8907: 1 lock held by syz-executor.2/10312: 4 locks held by syz-executor.0/10318: #0: ffff88802b3d0d88 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:554 #1: ffff88802b3d0078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x339/0x1100 net/bluetooth/hci_sync.c:5050 #2: ffffffff8f9aade8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1982 [inline] #2: ffffffff8f9aade8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xc4/0x260 net/bluetooth/hci_conn.c:2584 #3: ffffffff8dbbd0b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:323 3 locks held by syz-executor.3/10321: #0: ffff88802cb50d88 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:554 #1: ffff88802cb50078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x339/0x1100 net/bluetooth/hci_sync.c:5050 #2: ffffffff8f9aade8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1982 [inline] #2: ffffffff8f9aade8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xc4/0x260 net/bluetooth/hci_conn.c:2584 =============================================