INFO: task syz.3.955:8608 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.955 state:D
stack:29176 pid:8608 tgid:8606 ppid:2977 task_flags:0x400040 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x1325/0x47d0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7326
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7383
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0xccc/0x1bd0 kernel/locking/mutex.c:821
device_lock include/linux/device.h:1102 [inline]
__device_driver_lock drivers/base/dd.c:1171 [inline]
__driver_attach+0x214/0x5b0 drivers/base/dd.c:1291
bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383
bus_add_driver+0x305/0x5b0 drivers/base/bus.c:763
driver_register+0x1e2/0x360 drivers/base/driver.c:174
usb_gadget_register_driver_owner+0x132/0x210 drivers/usb/gadget/udc/core.c:1725
raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:596 [inline]
raw_ioctl+0x1a85/0x2b80 drivers/usb/gadget/legacy/raw_gadget.c:1307
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0x7f0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f09dfb8caeb
RSP: 002b:00007f09de5c3f00 EFLAGS: 00000246
ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f09dfb8caeb
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000004
RBP: 00007f09de5c4fd0 R08: 0000000000000001 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000200000001300 R14: 0000000000000001 R15: 0000000000000868
</TASK>
INFO: task syz.3.955:8609 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.955 state:D
stack:28488 pid:8609 tgid:8606 ppid:2977 task_flags:0x400040 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x1325/0x47d0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7326
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7383
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0xccc/0x1bd0 kernel/locking/mutex.c:821
device_lock include/linux/device.h:1102 [inline]
__device_driver_lock drivers/base/dd.c:1171 [inline]
__driver_attach+0x214/0x5b0 drivers/base/dd.c:1291
bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383
bus_add_driver+0x305/0x5b0 drivers/base/bus.c:763
driver_register+0x1e2/0x360 drivers/base/driver.c:174
usb_gadget_register_driver_owner+0x132/0x210 drivers/usb/gadget/udc/core.c:1725
raw_ioctl_run drivers/usb/gadget/legacy/raw_gadget.c:596 [inline]
raw_ioctl+0x1a85/0x2b80 drivers/usb/gadget/legacy/raw_gadget.c:1307
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl fs/ioctl.c:583 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0x7f0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f09dfb8caeb
RSP: 002b:00007f09de5a2f00 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f09dfb8caeb
RDX: 0000000000000000 RSI: 0000000000005501 RDI: 0000000000000005
RBP: 00007f09de5a3fd0 R08: 0000000000000001 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000200000001a00 R14: 0000000000000003 R15: 00000000000010d0
</TASK>
Showing all locks held in the system:
1 lock held by kworker/R-mm_pe/13:
5 locks held by kworker/1:1/28:
1 lock held by khungtaskd/30:
#0:
ffffffff896e3000
(
rcu_read_lock
){....}-{1:3}
, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775
3 locks held by kworker/u8:1/32:
#0:
ffff888112707140 (
(wq_completion)ipv6_addrconf
){+.+.}-{0:0}
, at: process_one_work+0x12b1/0x1940 kernel/workqueue.c:3297
#1:
ffffc90000227d18
(
(work_completion)(&(&net->ipv6.addr_chk_work)->work)
){+.+.}-{0:0}
, at: process_one_work+0x988/0x1940 kernel/workqueue.c:3298
#2:
ffffffff8ab21a80
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4769
7 locks held by kworker/1:2/1123:
2 locks held by getty/2924:
#0:
ffff888114b620a0
(
&tty->ldisc_sem
){++++}-{0:0}
, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1:
ffffc900000452e8
(
&ldata->atomic_read_lock
){+.+.}-{4:4}
, at: n_tty_read+0x419/0x14e0 drivers/tty/n_tty.c:2211
1 lock held by udevd/5205:
#0: ffffffff896eeaa8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x19e/0x3c0 kernel/rcu/tree_exp.h:343
3 locks held by kworker/1:3/5227:
3 locks held by kworker/1:4/5228:
5 locks held by kworker/1:5/5340:
5 locks held by kworker/1:6/5341:
4 locks held by kworker/u8:0/7691:
#0: ffff888100e98940 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x12b1/0x1940 kernel/workqueue.c:3297
#1:
ffffc90015a57d18
(
net_cleanup_work
){+.+.}-{0:0}
, at: process_one_work+0x988/0x1940 kernel/workqueue.c:3298
#2:
ffffffff8ab09048 (pernet_ops_rwsem){++++}-{4:4}
, at: cleanup_net+0xb8/0x920 net/core/net_namespace.c:673
#3:
ffffffff896ee978
(
rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x48/0x6d0 kernel/rcu/tree.c:3857
1 lock held by syz.3.955/8609:
#0: ffffffff896eeaa8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x27f/0x3c0 kernel/rcu/tree_exp.h:311
2 locks held by syz-executor/8612:
#0:
ffffffff8ab09048
(
pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x451/0x7c0 net/core/net_namespace.c:575
#1:
ffffffff8ab21a80
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2103
2 locks held by syz-executor/8622:
#0:
ffffffff8ab09048
(
pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x451/0x7c0 net/core/net_namespace.c:575
#1: ffffffff8ab21a80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#1: ffffffff8ab21a80 (rtnl_mutex){+.+.}-{4:4}, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2103
2 locks held by syz-executor/8632:
#0: ffffffff8ab09048 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x451/0x7c0 net/core/net_namespace.c:575
#1:
ffffffff8ab21a80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
ffffffff8ab21a80 (rtnl_mutex){+.+.}-{4:4}, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2103
2 locks held by syz-executor/8641:
#0: ffffffff8ab09048 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x451/0x7c0 net/core/net_namespace.c:575
#1: ffffffff8ab21a80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#1: ffffffff8ab21a80 (rtnl_mutex){+.+.}-{4:4}, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2103
2 locks held by syz-executor/8644:
#0: ffffffff8ab09048 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x451/0x7c0 net/core/net_namespace.c:575
#1:
ffffffff8ab21a80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
ffffffff8ab21a80 (rtnl_mutex){+.+.}-{4:4}, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2103
2 locks held by syz-executor/8663:
#0:
ffffffff8ab09048
(
pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x451/0x7c0 net/core/net_namespace.c:575
#1:
ffffffff8ab21a80
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2103
2 locks held by syz-executor/8673:
#0:
ffffffff8ab09048
(
pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x451/0x7c0 net/core/net_namespace.c:575
#1:
ffffffff8ab21a80
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2103
2 locks held by syz-executor/8683:
#0:
ffffffff8ab09048
(
pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x451/0x7c0 net/core/net_namespace.c:575
#1:
ffffffff8ab21a80
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2103
2 locks held by syz-executor/8693:
#0:
ffffffff8ab09048
(
pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x451/0x7c0 net/core/net_namespace.c:575
#1:
ffffffff8ab21a80
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2103
2 locks held by syz-executor/8701:
#0:
ffffffff8ab09048
(
pernet_ops_rwsem
){++++}-{4:4}
, at: copy_net_ns+0x451/0x7c0 net/core/net_namespace.c:575
#1:
ffffffff8ab21a80
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: register_netdevice_notifier_net+0x23/0xb0 net/core/dev.c:2103
1 lock held by syz-executor/8713:
#0:
ffffffff8ab21a80
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: inet_rtm_newaddr+0x30c/0x18b0 net/ipv4/devinet.c:978
1 lock held by syz-executor/8717:
#0:
ffffffff8ab21a80
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: inet_rtm_newaddr+0x30c/0x18b0 net/ipv4/devinet.c:978
1 lock held by syz-executor/8721:
#0:
ffffffff8ab21a80
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: inet_rtm_newaddr+0x30c/0x18b0 net/ipv4/devinet.c:978
1 lock held by syz-executor/8725:
#0:
ffffffff8ab21a80
(
rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: inet_rtm_newaddr+0x30c/0x18b0 net/ipv4/devinet.c:978
1 lock held by syz-executor/8729:
#0: ffffffff8ab21a80 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#0: ffffffff8ab21a80 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x30c/0x18b0 net/ipv4/devinet.c:978
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(lazy)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x21c/0x2a0 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xcb1/0x1030 kernel/hung_task.c:561
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Sending NMI from CPU 0 to CPUs 1:
yealink 4-1:36.0: unexpected response 0
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1123 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT(lazy)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events_power_efficient gc_worker
RIP: 0010:io_serial_out+0x8f/0xb0 drivers/tty/serial/8250/8250_port.c:408
Code: 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 1c 66 03 5d 40 44 89 e8 89 da ee <5b> 5d 41 5c 41 5d e9 c6 6b 52 04 e8 b1 08 f1 fe eb a0 e8 3a 09 f1
RSP: 0000:ffffc900001a84a8 EFLAGS: 00000002
RAX: 000000000000005b RBX: 00000000000003f8 RCX: 0000000000000000
RDX: 00000000000003f8 RSI: ffffffff832b5ae5 RDI: ffffffff9423fd60
RBP: ffffffff9423fd20 R08: 0000000000000001 R09: 000000000000001f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 000000000000005b R14: ffffffff940808ae R15: ffffffff832b5a80
FS: 0000000000000000(0000) GS:ffff888268740000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f09de5c5ff8 CR3: 0000000118f1c000 CR4: 00000000003506f0
Call Trace:
<IRQ>
serial_port_out include/linux/serial_core.h:813 [inline]
serial8250_console_putchar drivers/tty/serial/8250/8250_port.c:3239 [inline]
serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3301 [inline]
serial8250_console_write+0xe2c/0x1a50 drivers/tty/serial/8250/8250_port.c:3379
console_emit_next_record kernel/printk/printk.c:3183 [inline]
console_flush_one_record+0x790/0xe50 kernel/printk/printk.c:3269
console_flush_all kernel/printk/printk.c:3343 [inline]
__console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
console_unlock+0x103/0x260 kernel/printk/printk.c:3413
vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
dev_vprintk_emit+0x391/0x3e0 drivers/base/core.c:4996
dev_printk_emit+0xd2/0x10d drivers/base/core.c:5007
__dev_printk+0xcb/0x100 drivers/base/core.c:5019
_dev_err+0xef/0x127 drivers/base/core.c:5062
urb_irq_callback.cold+0x81/0xfd drivers/input/misc/yealink.c:426
__usb_hcd_giveback_urb+0x38d/0x610 drivers/usb/core/hcd.c:1657
usb_hcd_giveback_urb+0x3ca/0x4a0 drivers/usb/core/hcd.c:1741
dummy_timer+0xda1/0x36c0 drivers/usb/gadget/udc/dummy_hcd.c:2005
__run_hrtimer kernel/time/hrtimer.c:2032 [inline]
__hrtimer_run_queues+0x462/0x9c0 kernel/time/hrtimer.c:2096
hrtimer_run_softirq+0x17d/0x2c0 kernel/time/hrtimer.c:2113
handle_softirqs+0x1dd/0x990 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0x160/0x210 kernel/softirq.c:735
irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1062
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x5e/0x370 kernel/locking/lockdep.c:5872
Code: 05 bb d1 6d 0b 83 f8 07 0f 87 da 00 00 00 48 0f a3 05 46 4a 63 09 0f 82 ac 02 00 00 8b 35 0e 5a 63 09 85 f6 0f 85 c7 00 00 00 <48> 8b 44 24 30 65 48 2b 05 5d d1 6d 0b 0f 85 ec 02 00 00 48 83 c4
RSP: 0000:ffffc90003c6fae0 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff890ccf0c RDI: ffffffff87b15200
RBP: ffffffff896e3000 R08: 000000006c46b02f R09: 0000000000000007
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
rcu_read_lock include/linux/rcupdate.h:840 [inline]
gc_worker+0x22a/0x1a30 net/netfilter/nf_conntrack_core.c:1532
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>