INFO: task getty:205 blocked for more than 132 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:getty           state:D stack:0     pid:205   tgid:205   ppid:1      flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6063 [inline]
 __schedule+0x1496/0x20b0 kernel/sched/core.c:7883
 __schedule_loop kernel/sched/core.c:7960 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7975
 schedule_timeout+0xc7/0x3b0 kernel/time/timer.c:2596
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common+0x368/0x650 kernel/sched/completion.c:127
 wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
 __flush_work+0x6a8/0xaa0 kernel/workqueue.c:4290
 __cancel_work_sync kernel/workqueue.c:4411 [inline]
 disable_work_sync+0xab/0xd0 kernel/workqueue.c:4522
 hci_unregister_dev+0x174/0x3b0 net/bluetooth/hci_core.c:2716
 hci_uart_tty_close+0x292/0x330 drivers/bluetooth/hci_ldisc.c:581
 tty_ldisc_close drivers/tty/tty_ldisc.c:455 [inline]
 tty_ldisc_reinit+0x169/0x500 drivers/tty/tty_ldisc.c:660
 tty_ldisc_hangup+0x3d3/0x6e0 drivers/tty/tty_ldisc.c:725
 __tty_hangup+0x59f/0x820 drivers/tty/tty_io.c:624
 tty_vhangup_session+0x1e/0x30 drivers/tty/tty_io.c:728
 disassociate_ctty+0x3cd/0x8c0 drivers/tty/tty_jobctrl.c:275
 do_exit+0xa2e/0x2850 kernel/exit.c:959
 do_group_exit+0x21f/0x2f0 kernel/exit.c:1104
 __do_sys_exit_group kernel/exit.c:1115 [inline]
 __se_sys_exit_group kernel/exit.c:1113 [inline]
 __x64_sys_exit_group+0x43/0x50 kernel/exit.c:1113
 x64_sys_call+0x2ed2/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fa8ccaad6c5
RSP: 002b:00007ffe5f6cb808 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fa8ccbaefe8 RCX: 00007fa8ccaad6c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001
RBP: 0000000000000001 R08: 00007ffe5f6cb798 R09: 0000000000000000
R10: 00007ffe5f6cb630 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fa8ccbad680 R15: 00007fa8ccbaf000
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 238002c42480d657f84ffff3a67e0b81dcf43858
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xe45/0xf90 kernel/hung_task.c:423
 kthread+0x2c4/0x360 kernel/kthread.c:389
 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>