INFO: task syz-executor.0:8823 blocked for more than 143 seconds. Not tainted 6.9.0-syzkaller-10729-gb6394d6f7159 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26128 pid:8823 tgid:8816 ppid:7612 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5408 [inline] __schedule+0x1796/0x4a00 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6837 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6894 rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178 __down_write_common+0x1af/0x200 kernel/locking/rwsem.c:1306 inode_lock include/linux/fs.h:791 [inline] chown_common+0x3e1/0x850 fs/open.c:780 vfs_fchown fs/open.c:858 [inline] ksys_fchown+0xea/0x160 fs/open.c:869 __do_sys_fchown fs/open.c:877 [inline] __se_sys_fchown fs/open.c:875 [inline] __x64_sys_fchown+0x7a/0x90 fs/open.c:875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd395e7cee9 RSP: 002b:00007fd396c280c8 EFLAGS: 00000246 ORIG_RAX: 000000000000005d RAX: ffffffffffffffda RBX: 00007fd395fac050 RCX: 00007fd395e7cee9 RDX: 0000000000000000 RSI: 0000000063202072 RDI: 0000000000000006 RBP: 00007fd395ec949e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fd395fac050 R15: 00007fff63a98ec8 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e333d20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline] #0: ffffffff8e333d20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline] #0: ffffffff8e333d20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 4 locks held by kworker/u8:2/35: #0: ffff8880b953e798 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559 #1: ffff8880b9528948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988 #2: ffff888023660388 (&wb->work_lock){..-.}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:376 [inline] #2: ffff888023660388 (&wb->work_lock){..-.}-{2:2}, at: wb_wakeup_delayed fs/fs-writeback.c:163 [inline] #2: ffff888023660388 (&wb->work_lock){..-.}-{2:2}, at: wb_workfn+0xfa7/0x1090 fs/fs-writeback.c:2331 #3: ffff8880b952a718 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x744/0xeb0 kernel/time/timer.c:1164 3 locks held by kworker/u8:7/2796: 2 locks held by getty/4838: #0: ffff88802ab6b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000312b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201 2 locks held by syz-fuzzer/5079: 3 locks held by kworker/1:5/5157: #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline] #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312 #1: ffffc900036d7d00 (free_ipc_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline] #1: ffffc900036d7d00 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312 #2: ffffffff8e3390f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:323 [inline] #2: ffffffff8e3390f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:939 3 locks held by syz-executor.0/8817: 2 locks held by syz-executor.0/8823: #0: ffff88807d132420 (sb_writers#22){.+.+}-{0:0}, at: mnt_want_write_file+0x61/0x200 fs/namespace.c:453 #1: ffff88805eacc188 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: inode_lock include/linux/fs.h:791 [inline] #1: ffff88805eacc188 (&type->i_mutex_dir_key#17){++++}-{3:3}, at: chown_common+0x3e1/0x850 fs/open.c:780 3 locks held by syz-executor.1/10029: #0: ffff88805a9c0d88 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:554 [inline] #0: ffff88805a9c0d88 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x1d3/0x4e0 net/bluetooth/hci_core.c:2760