INFO: task syz-executor:2950 blocked for more than 143 seconds.
Not tainted 6.16.0-rc4-syzkaller-00321-g300386d117a9 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D
stack:24520 pid:2950 tgid:2950 ppid:1 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5396 [inline]
__schedule+0x132a/0x3b10 kernel/sched/core.c:6785
__schedule_loop kernel/sched/core.c:6863 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6878
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6935
rwsem_down_read_slowpath+0x62f/0xb60 kernel/locking/rwsem.c:1084
__down_read_common kernel/locking/rwsem.c:1248 [inline]
__down_read kernel/locking/rwsem.c:1261 [inline]
down_read+0xef/0x480 kernel/locking/rwsem.c:1526
kernfs_dop_revalidate+0xa5/0x740 fs/kernfs/dir.c:1180
d_revalidate fs/namei.c:929 [inline]
d_revalidate fs/namei.c:925 [inline]
lookup_fast+0x266/0x610 fs/namei.c:1778
walk_component+0x5b/0x5b0 fs/namei.c:2134
link_path_walk+0x627/0xe20 fs/namei.c:2506
path_openat+0x1b0/0x2cb0 fs/namei.c:4051
do_filp_open+0x20b/0x470 fs/namei.c:4082
do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb55f46e221
RSP: 002b:00007ffff47c4cc0 EFLAGS: 00000287
ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00000000000000a2 RCX: 00007fb55f46e221
RDX: 0000000000090800 RSI: 00007fb55f4f0fc1 RDI: 00000000ffffff9c
RBP: 00007ffff47c4d6c R08: 0000000000009960 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000287 R12: 000000000000003c
R13: 0000000000000000 R14: 0000000000034043 R15: 00007ffff47c4dc0
Showing all locks held in the system:
5 locks held by kworker/0:0/9:
9 locks held by kworker/0:1/10:
1 lock held by khungtaskd/30:
#0:
ffffffff890c7ec0
(
rcu_read_lock
){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6770
9 locks held by kworker/0:2/1115:
2 locks held by getty/2904:
#0:
ffff88811285d0a0
(&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900000432f0
(&ldata->atomic_read_lock
){+.+.}-{4:4}
, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/2953:
#0:
ffffffff890d34b8
(
rcu_state.exp_mutex
){+.+.}-{4:4}
, at: exp_funnel_lock+0x284/0x3c0 kernel/rcu/tree_exp.h:304
1 lock held by syz-executor/2955:
#0:
ffffffff890d34b8
(
rcu_state.exp_mutex
){+.+.}-{4:4}
, at: exp_funnel_lock+0x1a3/0x3c0 kernel/rcu/tree_exp.h:336
4 locks held by udevd/5222:
#0:
ffff888132fd51c8
(
&p->lock
){+.+.}-{4:4}
, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182
#1: ffff888133f4b888 (&of->mutex
){+.+.}-{4:4}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2: ffff88811aca5e18 (kn->active#9){.+.+}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3:
ffff8881062e6198 (&dev->mutex){....}-{4:4}, at: device_lock_interruptible include/linux/device.h:889 [inline]
ffff8881062e6198 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
4 locks held by udevd/5235:
#0: ffff888133a458b8 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182
#1:
ffff888138cbc888 (
&of->mutex){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2:
ffff88810faf02d8 (kn->active#9){.+.+}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3:
ffff88811c927198
(
&dev->mutex
){....}-{4:4}
, at: device_lock_interruptible include/linux/device.h:889 [inline]
, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
3 locks held by kworker/0:3/5260:
5 locks held by kworker/0:5/5408:
1 lock held by syz-executor/6367:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.16.0-rc4-syzkaller-00321-g300386d117a9 #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xf70/0x12c0 kernel/hung_task.c:470
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5b3/0x6c0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
radio-si470x 1-1:0.0: non-zero urb status (-71)
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted 6.16.0-rc4-syzkaller-00321-g300386d117a9 #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: usb_hub_wq hub_event
RIP: 0010:io_serial_in+0x87/0xb0 drivers/tty/serial/8250/8250_port.c:410
Code: 3e a8 fe 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 1a 66 03 5d 40 89 da ec <5b> 0f b6 c0 5d 41 5c e9 bd 5b 5c 04 e8 a8 3f 05 ff eb a2 e8 31 40
RSP: 0018:ffffc900000073d8 EFLAGS: 00000002
RAX: dffffc0000000060 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff82d59330 RDI: ffffffff93928fc0
RBP: ffffffff93928f80 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000020 R14: fffffbfff272524a R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff888269162000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3008f0 CR3: 0000000116aac000 CR4: 00000000003506f0
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+0x13a/0x210 drivers/tty/serial/8250/8250_port.c:2094
fifo_wait_for_lsr drivers/tty/serial/8250/8250_port.c:3348 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3371 [inline]
serial8250_console_write+0xf83/0x1890 drivers/tty/serial/8250/8250_port.c:3456
console_emit_next_record kernel/printk/printk.c:3138 [inline]
console_flush_all+0x801/0xc60 kernel/printk/printk.c:3226
__console_flush_and_unlock kernel/printk/printk.c:3285 [inline]
console_unlock+0xd8/0x210 kernel/printk/printk.c:3325
vprintk_emit+0x418/0x6d0 kernel/printk/printk.c:2450
dev_vprintk_emit drivers/base/core.c:4917 [inline]
dev_printk_emit+0xfa/0x140 drivers/base/core.c:4928
__dev_printk+0xf5/0x270 drivers/base/core.c:4940
_dev_warn+0xe4/0x120 drivers/base/core.c:4984
si470x_int_in_callback+0x15d/0xca0 drivers/media/radio/si470x/radio-si470x-usb.c:378
__usb_hcd_giveback_urb+0x38a/0x6e0 drivers/usb/core/hcd.c:1663
usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1747
dummy_timer+0x1814/0x3a30 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842
handle_softirqs+0x208/0x8d0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xfa/0x160 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_pc+0x56/0x70 kernel/kcov.c:222
Code: 00 f0 00 75 35 8b 82 74 15 00 00 85 c0 74 2b 8b 82 50 15 00 00 83 f8 02 75 20 48 8b 8a 58 15 00 00 8b 92 54 15 00 00 48 8b 01 <48> 83 c0 01 48 39 d0 73 07 48 89 01 48 89 34 c1 e9 85 1d b4 05 0f
RSP: 0018:ffffc900000af5f8 EFLAGS: 00000246
RAX: 00000000000fffff RBX: 0000000000000001 RCX: ffffc90011cdd000
RDX: 0000000000100000 RSI: ffffffff820b3340 RDI: 0000000000000001
RBP: ffff888100ac4800 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: ffffffff878e11a0 R14: 0000000000000000 R15: 0000000000001000
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
kernfs_root+0xe0/0x2a0 fs/kernfs/kernfs-internal.h:75
kernfs_add_one+0x25/0x840 fs/kernfs/dir.c:785
__kernfs_create_file+0x295/0x350 fs/kernfs/file.c:1068
sysfs_add_file_mode_ns+0x207/0x3c0 fs/sysfs/file.c:319
sysfs_create_file_ns+0x13d/0x1d0 fs/sysfs/file.c:386
sysfs_create_file include/linux/sysfs.h:771 [inline]
device_create_file+0xf2/0x1e0 drivers/base/core.c:3058
device_add+0x2bf/0x1a70 drivers/base/core.c:3639
usb_create_ep_devs+0x160/0x2b0 drivers/usb/core/endpoint.c:170
usb_new_device+0xfc1/0x1a20 drivers/usb/core/hub.c:2724
hub_port_connect drivers/usb/core/hub.c:5566 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
port_event drivers/usb/core/hub.c:5866 [inline]
hub_event+0x2f85/0x5030 drivers/usb/core/hub.c:5948
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3321 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x5b3/0x6c0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245