INFO: task syz.0.5937:18489 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.5937 state:D stack:0 pid:18489 tgid:18488 ppid:13928 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5945 [inline]
__schedule+0x1322/0x1df0 kernel/sched/core.c:7791
__schedule_loop kernel/sched/core.c:7872 [inline]
schedule+0xc6/0x240 kernel/sched/core.c:7887
super_lock+0x150/0x300 fs/super.c:115
super_lock_shared fs/super.c:140 [inline]
iterate_supers+0x8a/0x560 fs/super.c:934
ksys_sync+0x95/0x160 fs/sync.c:103
__ia32_sys_sync+0x12/0x20 fs/sync.c:114
x64_sys_call+0x2a58/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:163
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7efd0058f6c9
RSP: 002b:00007efd013a4038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007efd007e5fa0 RCX: 00007efd0058f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007efd007e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efd007e6038 R14: 00007efd007e5fa0 R15: 00007ffd04b41878
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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:267 [inline]
watchdog+0xd8f/0xed0 kernel/hung_task.c:423
kthread+0x2ca/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 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: 22902 Comm: syz.8.7383 Not tainted syzkaller #0 0b5ffdee5fcd2f7749818d1ff954e9c21353764e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:serial_port_in include/linux/serial_core.h:794 [inline]
RIP: 0010:serial8250_console_write+0x322/0x2130 drivers/tty/serial/8250/8250_port.c:3385
Code: 74 08 48 89 df e8 fe a3 c3 fe 48 89 5c 24 50 4d 8b 5c 24 18 4c 89 e7 be 01 00 00 00 41 ba 99 e2 9e 0f 45 03 53 f1 74 02 0f 0b <2e> e8 cc 01 e8 1c 89 84 24 8c 00 00 00 4d 8d bc 24 58 02 00 00 4c
RSP: 0018:ffffc90001def600 EFLAGS: 00000057
RAX: 1ffffffff113ebff RBX: ffffffff889f5ff8 RCX: 0000000000080000
RDX: ffffc90004959000 RSI: 0000000000000001 RDI: ffffffff889f5fe0
RBP: ffffc90001def788 R08: 0000000000000003 R09: 0000000000000004
R10: 0000000000000000 R11: ffffffff83190950 R12: ffffffff889f5fe0
R13: dffffc0000000000 R14: ffffffff889f60e8 R15: 0000000000000000
FS: 00007ff3f06006c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffa730dc3a0 CR3: 000000015ac20000 CR4: 00000000003526b0
Call Trace:
univ8250_console_write+0x6f/0xb0 drivers/tty/serial/8250/8250_core.c:396
console_emit_next_record kernel/printk/printk.c:3151 [inline]
console_flush_all+0x5e6/0xaa0 kernel/printk/printk.c:3239
__console_flush_and_unlock kernel/printk/printk.c:3298 [inline]
console_unlock+0xe9/0x270 kernel/printk/printk.c:3338
vprintk_emit+0x27c/0x640 kernel/printk/printk.c:2462
vprintk_default+0x2a/0x40 kernel/printk/printk.c:2477
vprintk+0x93/0xa0 kernel/printk/printk_safe.c:73
_printk+0xd0/0x120 kernel/printk/printk.c:2487
input_register_device+0xa70/0x10d0 drivers/input/input.c:2458
uinput_create_device+0x514/0x670 drivers/input/misc/uinput.c:365
uinput_ioctl_handler+0x3ec/0x1520 drivers/input/misc/uinput.c:918
uinput_ioctl+0x2c/0x40 drivers/input/misc/uinput.c:1089
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0x135/0x1b0 fs/ioctl.c:893
__x64_sys_ioctl+0x7f/0xa0 fs/ioctl.c:893
x64_sys_call+0x1878/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:17
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7ff3ef78f6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff3f0600038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff3ef9e5fa0 RCX: 00007ff3ef78f6c9
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 000000000000000e
RBP: 00007ff3ef811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff3ef9e6038 R14: 00007ff3ef9e5fa0 R15: 00007ffe29f58f98