INFO: task kworker/u5:3:3649 blocked for more than 143 seconds. Not tainted 5.19.0-rc2-syzkaller-00049-g24625f7d91fb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u5:3 state:D stack:25880 pid: 3649 ppid: 2 flags:0x00004000 Workqueue: hci6 hci_power_on Call Trace: context_switch kernel/sched/core.c:5116 [inline] __schedule+0x957/0xec0 kernel/sched/core.c:6428 schedule+0xeb/0x1b0 kernel/sched/core.c:6500 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6559 __mutex_lock_common+0xecf/0x26c0 kernel/locking/mutex.c:679 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799 hci_dev_do_open net/bluetooth/hci_core.c:480 [inline] hci_power_on+0x178/0x650 net/bluetooth/hci_core.c:963 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 INFO: task syz-executor.0:24518 blocked for more than 143 seconds. Not tainted 5.19.0-rc2-syzkaller-00049-g24625f7d91fb #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26584 pid:24518 ppid: 3637 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5116 [inline] __schedule+0x957/0xec0 kernel/sched/core.c:6428 schedule+0xeb/0x1b0 kernel/sched/core.c:6500 schedule_timeout+0xac/0x300 kernel/time/timer.c:1911 do_wait_for_common+0x3ea/0x560 kernel/sched/completion.c:85 __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x46/0x60 kernel/sched/completion.c:138 __flush_work kernel/workqueue.c:3075 [inline] __cancel_work_timer+0x585/0x740 kernel/workqueue.c:3162 hci_dev_close_sync+0x31/0xcc0 net/bluetooth/hci_sync.c:4091 hci_dev_do_close net/bluetooth/hci_core.c:553 [inline] hci_unregister_dev+0x1b1/0x460 net/bluetooth/hci_core.c:2685 hci_uart_tty_close+0x1a7/0x280 drivers/bluetooth/hci_ldisc.c:548 tty_set_ldisc+0x22e/0x670 drivers/tty/tty_ldisc.c:552 tty_ioctl+0xada/0xc60 drivers/tty/tty_io.c:2714 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7fba6ca89109 RSP: 002b:00007fba6db03168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fba6cb9bf60 RCX: 00007fba6ca89109 RDX: 0000000020000000 RSI: 0000000000005423 RDI: 0000000000000003 RBP: 00007fba6cae305d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd8ea5406f R14: 00007fba6db03300 R15: 0000000000022000 Showing all locks held in the system: 2 locks held by pr/ttyS0/16: 1 lock held by khungtaskd/29: #0: ffffffff8cb1eca0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/3292: #0: ffff88814a7bd098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244 #1: ffffc90002d162e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6e8/0x1e50 drivers/tty/n_tty.c:2124 3 locks held by kworker/u5:3/3649: #0: ffff888024c65138 ((wq_completion)hci6){+.+.}-{0:0}, at: process_one_work+0x796/0xd10 kernel/workqueue.c:2262 #1: ffffc900031dfd00 ((work_completion)(&hdev->power_on)){+.+.}-{0:0}, at: process_one_work+0x7d0/0xd10 kernel/workqueue.c:2264 #2: ffff888026bd1048 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open net/bluetooth/hci_core.c:480 [inline] #2: ffff888026bd1048 (&hdev->req_lock){+.+.}-{3:3}, at: hci_power_on+0x178/0x650 net/bluetooth/hci_core.c:963 2 locks held by kworker/u4:4/24513: 3 locks held by syz-executor.0/24518: #0: ffff8880759161c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_set_ldisc+0x4e/0x670 drivers/tty/tty_ldisc.c:529 #1: ffff888075916098 (&tty->ldisc_sem){++++}-{0:0}, at: __tty_ldisc_lock drivers/tty/tty_ldisc.c:290 [inline] #1: ffff888075916098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_lock+0x6a/0xb0 drivers/tty/tty_ldisc.c:314 #2: ffff888026bd1048 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:551 [inline] #2: ffff888026bd1048 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x1a9/0x460 net/bluetooth/hci_core.c:2685 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted 5.19.0-rc2-syzkaller-00049-g24625f7d91fb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 nmi_cpu_backtrace+0x473/0x4a0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x168/0x280 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xd18/0xd60 kernel/hung_task.c:378 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 16 Comm: pr/ttyS0 Not tainted 5.19.0-rc2-syzkaller-00049-g24625f7d91fb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:io_serial_in+0x71/0xb0 drivers/tty/serial/8250/8250_port.c:460 Code: f5 94 d6 fc 89 e9 41 d3 e6 48 83 c3 40 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 66 7f 29 fd 44 03 33 44 89 f2 ec <0f> b6 c0 5b 41 5e 41 5f 5d c3 89 e9 80 e1 07 38 c1 7c ad 48 89 ef RSP: 0018:ffffc90000157958 EFLAGS: 00000002 RAX: 1ffffffff2319700 RBX: ffffffff918cb9e0 RCX: 0000000000000000 RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020 RBP: 0000000000000000 R08: ffffffff84b11191 R09: ffffed1003b92047 R10: ffffed1003b92047 R11: 1ffff11003b92046 R12: 0000000000000000 R13: ffff888140160830 R14: 00000000000003fd R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c019fe0b30 CR3: 0000000022ad0000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: serial_in drivers/tty/serial/8250/8250.h:118 [inline] wait_for_lsr drivers/tty/serial/8250/8250_port.c:2085 [inline] serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3354 [inline] serial8250_console_write+0x10d1/0x16d0 drivers/tty/serial/8250/8250_port.c:3436 call_console_driver kernel/printk/printk.c:2075 [inline] __console_emit_next_record+0x82c/0xb30 kernel/printk/printk.c:2916 console_emit_next_record kernel/printk/printk.c:3721 [inline] printk_kthread_func+0x9d8/0xd20 kernel/printk/printk.c:3837 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: fc cld 1: 89 e9 mov %ebp,%ecx 3: 41 d3 e6 shl %cl,%r14d 6: 48 83 c3 40 add $0x40,%rbx a: 48 89 d8 mov %rbx,%rax d: 48 c1 e8 03 shr $0x3,%rax 11: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 16: 74 08 je 0x20 18: 48 89 df mov %rbx,%rdi 1b: e8 66 7f 29 fd callq 0xfd297f86 20: 44 03 33 add (%rbx),%r14d 23: 44 89 f2 mov %r14d,%edx 26: ec in (%dx),%al * 27: 0f b6 c0 movzbl %al,%eax <-- trapping instruction 2a: 5b pop %rbx 2b: 41 5e pop %r14 2d: 41 5f pop %r15 2f: 5d pop %rbp 30: c3 retq 31: 89 e9 mov %ebp,%ecx 33: 80 e1 07 and $0x7,%cl 36: 38 c1 cmp %al,%cl 38: 7c ad jl 0xffffffe7 3a: 48 89 ef mov %rbp,%rdi