INFO: task syz-executor:5489 blocked for more than 122 seconds.
Not tainted 6.12.30-syzkaller-g030e00a2d78c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:5489 tgid:5489 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5924 [inline]
__schedule+0x145b/0x1f10 kernel/sched/core.c:7750
__schedule_loop kernel/sched/core.c:7831 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7846
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7903
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x836/0x1b60 kernel/locking/mutex.c:786
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1117
mutex_lock+0x102/0x1c0 kernel/locking/mutex.c:270
rcu_barrier+0x4d/0x530 kernel/rcu/tree.c:4574
netdev_run_todo+0x10e/0xcb0 net/core/dev.c:10864
rtnl_unlock+0x12/0x20 net/core/rtnetlink.c:152
tun_detach drivers/net/tun.c:704 [inline]
tun_chr_close+0xc5/0x150 drivers/net/tun.c:3517
__fput+0x1fe/0xa00 fs/file_table.c:431
____fput+0x20/0x30 fs/file_table.c:459
task_work_run+0x1e0/0x250 kernel/task_work.c:240
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x9b4/0x2630 kernel/exit.c:944
do_group_exit+0x22a/0x300 kernel/exit.c:1094
get_signal+0x139d/0x14f0 kernel/signal.c:2934
arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218
do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f99a4b84b53
RSP: 002b:00007ffde28bcb78 EFLAGS: 00000202 ORIG_RAX: 000000000000003d
RAX: fffffffffffffe00 RBX: 00000000000000d8 RCX: 00007f99a4b84b53
RDX: 0000000040000000 RSI: 00007ffde28bcbbc RDI: 00000000ffffffff
RBP: 00007ffde28bcbbc R08: 0000000023cd1478 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000045
R13: 000055558b219470 R14: 000000000002b035 R15: 00007ffde28bcc10
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted 6.12.30-syzkaller-g030e00a2d78c #0 57efd5a98e1182d97bd5f975427dc401009108c9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2bf/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:229 [inline]
watchdog+0xd8f/0xed0 kernel/hung_task.c:385
kthread+0x2ca/0x370 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
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 36 Comm: kauditd Not tainted 6.12.30-syzkaller-g030e00a2d78c #0 57efd5a98e1182d97bd5f975427dc401009108c9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:io_serial_in+0x7b/0xc0 drivers/tty/serial/8250/8250_port.c:406
Code: e8 ea 4f 6e fe 44 89 f9 d3 e3 49 83 c6 08 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 eb 47 c4 fe 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f 5d c3 cc cc cc cc cc 44 89 f9 80 e1
RSP: 0018:ffffc9000025f690 EFLAGS: 00000002
RAX: 1ffffffff113b500 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc9000025f6b0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: ffffffff831751b0 R12: dffffc0000000000
R13: 00000000000026fa R14: ffffffff889dada8 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c62b7e1b8 CR3: 000000010b3e2000 CR4: 00000000003526b0
Call Trace:
serial_in drivers/tty/serial/8250/8250.h:137 [inline]
serial_lsr_in drivers/tty/serial/8250/8250.h:159 [inline]
wait_for_lsr drivers/tty/serial/8250/8250_port.c:2069 [inline]
fifo_wait_for_lsr drivers/tty/serial/8250/8250_port.c:3315 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3337 [inline]
serial8250_console_write+0x147d/0x2130 drivers/tty/serial/8250/8250_port.c:3422
univ8250_console_write+0x6f/0xb0 drivers/tty/serial/8250/8250_core.c:396
console_emit_next_record kernel/printk/printk.c:3132 [inline]
console_flush_all+0x5e6/0xaa0 kernel/printk/printk.c:3220
__console_flush_and_unlock kernel/printk/printk.c:3279 [inline]
console_unlock+0xe9/0x270 kernel/printk/printk.c:3319
vprintk_emit+0x27c/0x640 kernel/printk/printk.c:2443
vprintk_default+0x2a/0x40 kernel/printk/printk.c:2458
vprintk+0x93/0xa0 kernel/printk/printk_safe.c:73
_printk+0xd0/0x120 kernel/printk/printk.c:2468
kauditd_printk_skb kernel/audit.c:546 [inline]
kauditd_hold_skb+0x1cc/0x230 kernel/audit.c:581
kauditd_send_queue+0x2c5/0x310 kernel/audit.c:766
kauditd_thread+0x4f0/0x740 kernel/audit.c:890
kthread+0x2ca/0x370 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
net_ratelimit: 147120 callbacks suppressed
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:ae:fb:b1:6e:f4:a7, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)