INFO: task syz.6.5663:16943 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.5663 state:D stack:0 pid:16943 tgid:16942 ppid:16638 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
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x81e/0x1b50 kernel/locking/mutex.c:803
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
mutex_lock+0x102/0x1c0 kernel/locking/mutex.c:285
device_lock include/linux/device.h:908 [inline]
usbdev_open+0x171/0x840 drivers/usb/core/devio.c:1051
chrdev_open+0x4db/0x5f0 fs/char_dev.c:414
do_dentry_open+0x97b/0x1510 fs/open.c:960
vfs_open+0x86/0x230 fs/open.c:1090
do_open fs/namei.c:3774 [inline]
path_openat+0x2b6c/0x34b0 fs/namei.c:3933
do_filp_open+0x1c6/0x3e0 fs/namei.c:3960
do_sys_openat2+0x12c/0x1c0 fs/open.c:1438
do_sys_open fs/open.c:1453 [inline]
__do_sys_openat fs/open.c:1469 [inline]
__se_sys_openat fs/open.c:1464 [inline]
__x64_sys_openat+0x13a/0x170 fs/open.c:1464
x64_sys_call+0xe69/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:258
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: 0033:0x7f49c598d550
RSP: 002b:00007f49c43f6b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000000000a401 RCX: 00007f49c598d550
RDX: 000000000000a401 RSI: 00007f49c43f6c10 RDI: 00000000ffffff9c
RBP: 00007f49c43f6c10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd
R13: 00007f49c5bb6038 R14: 00007f49c5bb5fa0 R15: 00007fff6b30b2b8
INFO: task syz.6.5663:16944 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.5663 state:D stack:0 pid:16944 tgid:16942 ppid:16638 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
schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
__mutex_lock_common kernel/locking/mutex.c:707 [inline]
__mutex_lock+0x81e/0x1b50 kernel/locking/mutex.c:803
__mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
mutex_lock+0x102/0x1c0 kernel/locking/mutex.c:285
device_lock include/linux/device.h:908 [inline]
usbdev_open+0x171/0x840 drivers/usb/core/devio.c:1051
chrdev_open+0x4db/0x5f0 fs/char_dev.c:414
do_dentry_open+0x97b/0x1510 fs/open.c:960
vfs_open+0x86/0x230 fs/open.c:1090
do_open fs/namei.c:3774 [inline]
path_openat+0x2b6c/0x34b0 fs/namei.c:3933
do_filp_open+0x1c6/0x3e0 fs/namei.c:3960
do_sys_openat2+0x12c/0x1c0 fs/open.c:1438
do_sys_open fs/open.c:1453 [inline]
__do_sys_openat fs/open.c:1469 [inline]
__se_sys_openat fs/open.c:1464 [inline]
__x64_sys_openat+0x13a/0x170 fs/open.c:1464
x64_sys_call+0xe69/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:258
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: 0033:0x7f49c598d550
RSP: 002b:00007f49c43d5b70 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000000000a401 RCX: 00007f49c598d550
RDX: 000000000000a401 RSI: 00007f49c43d5c10 RDI: 00000000ffffff9c
RBP: 00007f49c43d5c10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: cccccccccccccccd
R13: 00007f49c5bb6128 R14: 00007f49c5bb6090 R15: 00007fff6b30b2b8
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 a29bcd2d578c4b9493db917853c72486663e8fa1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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+0x2c7/0x370 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 36 Comm: kauditd Not tainted syzkaller #0 a29bcd2d578c4b9493db917853c72486663e8fa1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__kasan_check_write+0x0/0x20 mm/kasan/shadow.c:36
Code: 89 e5 89 f6 48 8b 4d 08 31 d2 e8 ab e4 ff ff 5d c3 cc cc cc cc cc 0f 1f 40 00 b8 f2 cf 5c 0a 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 89 e5 89 f6 48 8b 4d 08 ba 01 00 00 00 e8 78 e4
RSP: 0018:ffffc90000007bb8 EFLAGS: 00000056
RAX: f3f3f304f1f1f101 RBX: ffff8881f6e4f980 RCX: ffffffff858dda9f
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffc90000007be0
RBP: ffffc90000007c50 R08: ffff8881f6e4f983 R09: 1ffff1103edc9f30
R10: dffffc0000000000 R11: ffffed103edc9f31 R12: 1ffff92000000f78
R13: dffffc0000000000 R14: ffffc90000007be0 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555b9dc4a8 CR3: 000000010c6e8000 CR4: 00000000003526b0
Call Trace:
raw_spin_rq_lock_nested kernel/sched/core.c:643 [inline]
raw_spin_rq_lock kernel/sched/sched.h:1571 [inline]
rq_lock kernel/sched/sched.h:1875 [inline]
ttwu_queue kernel/sched/core.c:4504 [inline]
try_to_wake_up+0xd6a/0x1b00 kernel/sched/core.c:4845
wake_up_process+0x14/0x20 kernel/sched/core.c:4980
hrtimer_wakeup+0x52/0x70 kernel/time/hrtimer.c:1989
__run_hrtimer kernel/time/hrtimer.c:1753 [inline]
__hrtimer_run_queues+0x3bd/0x9e0 kernel/time/hrtimer.c:1817
hrtimer_interrupt+0x37e/0xf00 kernel/time/hrtimer.c:1879
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x8e/0x2b0 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x7d/0x90 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702
RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2076 [inline]
RIP: 0010:vprintk_emit+0x530/0x640 kernel/printk/printk.c:2461
Code: 81 e6 00 02 00 00 31 ff e8 8d 22 1e 00 48 81 e3 00 02 00 00 75 07 e8 9f 1d 1e 00 eb 06 e8 98 1d 1e 00 fb c6 05 50 44 31 07 00 42 fd ff ff e8 86 1d 1e 00 e9 a5 fe ff ff 41 ff ce bf 58 89 41
RSP: 0018:ffffc9000025fac0 EFLAGS: 00000293
RAX: ffffffff8167c6a8 RBX: 0000000000000200 RCX: ffff88810367a600
RDX: 0000000000000000 RSI: 0000000000000200 RDI: 0000000000000000
RBP: ffffc9000025fb88 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200004bf48 R12: 1ffff9200004bf5c
R13: 00000000000000fc R14: 0000000000000000 R15: dffffc0000000000
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
kauditd_printk_skb kernel/audit.c:546 [inline]
kauditd_hold_skb+0x1cc/0x230 kernel/audit.c:581
kauditd_send_queue+0x2c2/0x310 kernel/audit.c:766
kauditd_thread+0x4f0/0x740 kernel/audit.c:890
kthread+0x2c7/0x370 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