INFO: task getty:3942 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:getty state:D stack:22288 pid: 3942 ppid: 1 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
schedule_timeout+0xbd/0x2d0 kernel/time/timer.c:2093
do_wait_for_common+0x295/0x460 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+0x48/0x60 kernel/sched/completion.c:138
__flush_work+0x15a/0x210 kernel/workqueue.c:3094
__cancel_work_timer+0x3f4/0x560 kernel/workqueue.c:3181
hci_unregister_dev+0x163/0x590 net/bluetooth/hci_core.c:4061
hci_uart_tty_close+0x268/0x330 drivers/bluetooth/hci_ldisc.c:575
tty_ldisc_reinit+0xe4/0x460 drivers/tty/tty_ldisc.c:679
tty_ldisc_hangup+0x360/0x4a0 drivers/tty/tty_ldisc.c:745
__tty_hangup+0x44e/0x670 drivers/tty/tty_io.c:639
disassociate_ctty+0x38d/0x860 drivers/tty/tty_jobctrl.c:275
do_exit+0x5f9/0x2110 kernel/exit.c:888
do_group_exit+0x12c/0x2f0 kernel/exit.c:1004
__do_sys_exit_group kernel/exit.c:1015 [inline]
__se_sys_exit_group kernel/exit.c:1013 [inline]
__x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1013
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fca463696c5
RSP: 002b:00007ffd2589e3a8 EFLAGS: 00000206
ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fca4646afe8 RCX: 00007fca463696c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001
RBP: 0000000000000001 R08: 00007ffd2589e338 R09: 0000000000000000
R10: 00007ffd2589e1d0 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fca46469680 R15: 00007fca4646b000
Showing all locks held in the system:
9 locks held by ksoftirqd/1/20:
1 lock held by khungtaskd/27:
#0:
ffffffff8c31ef60
(
rcu_read_lock
){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
3 locks held by jbd2/sda1-8/3519:
1 lock held by klogd/3546:
2 locks held by getty/3942:
#0: ffff88814d8b41c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: __tty_hangup+0xc0/0x670 drivers/tty/tty_io.c:599
#1: ffff88814d8b4098 (&tty->ldisc_sem){++++}-{0:0}, at: __tty_ldisc_lock drivers/tty/tty_ldisc.c:300 [inline]
#1: ffff88814d8b4098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_lock+0x68/0xb0 drivers/tty/tty_ldisc.c:324
3 locks held by kworker/u5:4/4198:
#0:
ffff888147714938
(
(wq_completion)hci5){+.+.}-{0:0}
, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1:
ffffc90002f8fd00
(
(work_completion)(&hdev->power_on)
){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffff888019ff93f0 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_open+0xa4/0x12a0 net/bluetooth/hci_core.c:1464
2 locks held by syz.3.2168/11010:
2 locks held by syz.3.2194/11098:
1 lock held by cmp/11125:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xe1b/0xe60 kernel/hung_task.c:369
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11010 Comm: syz.3.2168 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:preempt_count_add+0x3e/0x190 kernel/sched/core.c:5512
Code: 2f 96 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 eb 00 00 00 83 3d 52 27 dd 14 00 75 07 65 8b 05 91 17 b0 7e 65 01 3d 8a 17 b0 7e <48> c7 c0 80 7f 2f 96 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 e6 00
RSP: 0018:ffffc9000339eec0 EFLAGS: 00000282
RAX: 0000000080000000 RBX: 0000000000000000 RCX: ffffffff962f7f03
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc9000339f050 R08: ffff88804a1216ef R09: 1ffff110094242dd
R10: dffffc0000000000 R11: ffffed10094242de R12: ffffea0001128e00
R13: 0000000000001000 R14: dffffc0000000000 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0918a5fe9c CR3: 00000000475c1000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kmap_atomic include/linux/highmem-internal.h:196 [inline]
copy_page_from_iter_atomic+0xa4/0x14d0 lib/iov_iter.c:968
generic_perform_write+0x30b/0x550 mm/filemap.c:3793
__generic_file_write_iter+0x261/0x4e0 mm/filemap.c:3912
generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944
__kernel_write+0x522/0x980 fs/read_write.c:539
__dump_emit+0x258/0x380 fs/coredump.c:943
dump_user_range+0x84/0x340 fs/coredump.c:1017
elf_core_dump+0x2fe0/0x3530 fs/binfmt_elf.c:2285
do_coredump+0x14e8/0x2a40 fs/coredump.c:894
get_signal+0x531/0x12e0 kernel/signal.c:2899
arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:157 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:181
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:217
irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:323
exc_page_fault+0x88/0x100 arch/x86/mm/fault.c:1499
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7fbd1513dbd7
Code: e8 fe f9 ff ff 89 f2 48 8d 3d 8d 4f 1b 00 48 8d 35 0a 0b 1e 00 31 c0 e8 37 f8 ff ff 0f 1f 80 00 00 00 00 53 89 fb 48 83 ec 10 <64> 8b 04 25 a4 ff ff ff 85 c0 74 2a 89 fe 31 c0 bf 3c 00 00 00 e8
RSP: 002b:00007fbd134c1120 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007fbd15288159
RDX: 00007fbd134c1140 RSI: 00007fbd134c1270 RDI: 000000000000000b
RBP: 00007fbd1531f06b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fbd15510038 R14: 00007fbd1550ffa0 R15: 00007ffea38e0e38
nf_conntrack: new packet for ffff888066b6c780
nf_nat: Already setup manip DST for ct ffff888066b6c780 (status bits 0x188)
nf_nat: Already setup manip SRC for ct ffff888066b6c780 (status bits 0x188)
wireguard: wg0: Sending keepalive packet to peer 31 ([::1]:20002/0%0)
tcp_in_window: START
tcp_in_window:
seq=0 ack=0+(0) sack=0+(0) win=1024 end=524
tcp_in_window: sender end=524 maxend=1548 maxwin=1024 scale=0 receiver end=0 maxend=1024 maxwin=1024 scale=0
tcp_in_window:
seq=0 ack=0+(0) sack=0+(0) win=1024 end=524
tcp_in_window: sender end=524 maxend=1548 maxwin=1024 scale=0 receiver end=0 maxend=1024 maxwin=1024 scale=0
tcp_in_window: I=1 II=1 III=1 IV=1