INFO: task kworker/1:0:23 blocked for more than 143 seconds.
Not tainted 6.15.0-rc6-syzkaller-00177-g882826f58b2c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0 state:D stack:20184 pid:23 tgid:23 ppid:2 task_flags:0x4288060 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x132a/0x3b00 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
rtnl_net_dev_lock+0x146/0x360 net/core/dev.c:2089
unregister_netdev+0x15/0x60 net/core/dev.c:12051
usbnet_disconnect+0x109/0x500 drivers/net/usb/usbnet.c:1648
usb_unbind_interface+0x1da/0x9a0 drivers/usb/core/driver.c:458
device_remove drivers/base/dd.c:569 [inline]
device_remove+0x122/0x170 drivers/base/dd.c:561
__device_release_driver drivers/base/dd.c:1272 [inline]
device_release_driver_internal+0x44b/0x620 drivers/base/dd.c:1295
bus_remove_device+0x22f/0x420 drivers/base/bus.c:579
device_del+0x396/0x9f0 drivers/base/core.c:3881
usb_disable_device+0x355/0x7d0 drivers/usb/core/message.c:1418
usb_disconnect+0x2e1/0x920 drivers/usb/core/hub.c:2316
hub_port_connect drivers/usb/core/hub.c:5375 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5675 [inline]
port_event drivers/usb/core/hub.c:5835 [inline]
hub_event+0x1aa0/0x5030 drivers/usb/core/hub.c:5917
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task kworker/u8:2:29708 blocked for more than 144 seconds.
Not tainted 6.15.0-rc6-syzkaller-00177-g882826f58b2c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:2 state:D stack:25752 pid:29708 tgid:29708 ppid:2 task_flags:0x4208060 flags:0x00004000
Workqueue: ipv6_addrconf addrconf_verify_work
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x132a/0x3b00 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
__mutex_lock_common kernel/locking/mutex.c:678 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:746
rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4738
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Showing all locks held in the system:
6 locks held by kworker/0:1/10:
#0:
ffff8881066b3948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc900000afd18
(
(work_completion)(&hub->events)
){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff88810bb55198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
#2: ffff88810bb55198 (&dev->mutex){....}-{4:4}, at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5863
#3:
ffff888122f2f198
(
&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
#4: ffff888122f2a160
(
&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
#5: ffffffff8a3b7be8
(rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock_killable include/linux/rtnetlink.h:145 [inline]
, at: register_netdev+0x18/0x50 net/core/dev.c:11111
6 locks held by kworker/1:0/23:
#0:
ffff8881066b3948
((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc9000018fd18
(
(work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2:
ffff88810bb6d198 (&dev->mutex
){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
){....}-{4:4}, at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5863
#3:
ffff88813b3e5198 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: usb_disconnect+0x10a/0x920 drivers/usb/core/hub.c:2307
#4: ffff8881377ad160
(
&dev->mutex
){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1094 [inline]
){....}-{4:4}, at: device_release_driver_internal+0xa4/0x620 drivers/base/dd.c:1292
#5:
ffffffff8a3b7be8 (rtnl_mutex
){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
){+.+.}-{4:4}, at: rtnl_net_dev_lock+0x146/0x360 net/core/dev.c:2089
1 lock held by khungtaskd/30:
#0: ffffffff890c2840 (rcu_read_lock
){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6764
4 locks held by dhcpcd/2879:
2 locks held by getty/2902:
#0: ffff88811208a0a0 (&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
4 locks held by udevd/5206:
#0: ffff8881367638b8 (&p->lock){+.+.}-{4:4}
, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182
#1:
ffff88811c0dd888 (&of->mutex#2
){+.+.}-{4:4}
, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2: ffff888112a46878 (kn->active#18){++++}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3: ffff888117597198
(&dev->mutex
){....}-{4:4}
, at: device_lock_interruptible include/linux/device.h:927 [inline]
, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
4 locks held by udevd/5273:
#0: ffff88813752db08
(
&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182
#1: ffff888113a4bc88
(&of->mutex
#2
){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2: ffff888119d3bd28
(kn->active
#18
){++++}-{0:0}
, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3:
ffff888122f2f198
(&dev->mutex){....}-{4:4}, at: device_lock_interruptible include/linux/device.h:927 [inline]
(&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
4 locks held by udevd/5386:
#0: ffff88812caaa418 (
&p->lock
){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182
#1: ffff88811219bc88
(&of->mutex#2
){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2: ffff888111ed4788
(kn->active#19){++++}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3: ffff88811d92a198
(&dev->mutex
){....}-{4:4}
, at: device_lock_interruptible include/linux/device.h:927 [inline]
, at: product_show+0x26/0xa0 drivers/usb/core/sysfs.c:141
4 locks held by udevd/7604:
#0:
ffff88813663a0a0 (&p->lock
){+.+.}-{4:4}
, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182
#1:
ffff88810c31e488 (&of->mutex#2
){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2: ffff88811ab73d28
(kn->active#18){++++}-{0:0}
, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3: ffff8881373e1198
(&dev->mutex
){....}-{4:4}
, at: device_lock_interruptible include/linux/device.h:927 [inline]
, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142
6 locks held by kworker/1:5/11004:
#0: ffff8881066b3948 ((wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1:
ffffc90012fc7d18 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2:
ffff88810bbfd198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
ffff88810bbfd198 (&dev->mutex){....}-{4:4}, at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5863
#3: ffff888117597198
(&dev->mutex
){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
#4: ffff88811f086160
(&dev->mutex
){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
#5: ffffffff8a3b7be8
(rtnl_mutex){+.+.}-{4:4}
, at: rtnl_net_lock_killable include/linux/rtnetlink.h:145 [inline]
, at: register_netdev+0x18/0x50 net/core/dev.c:11111
6 locks held by kworker/0:8/26234:
#0:
ffff8881066b3948
((wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90003747d18
((work_completion)(&hub->events)){+.+.}-{0:0}
, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff88810bb45198 (
&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5863
#3:
ffff88811d92a198 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
#4:
ffff88810abcb160
(&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
(&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
#5: ffffffff8a3b7be8 (rtnl_mutex
){+.+.}-{4:4}, at: rtnl_net_lock_killable include/linux/rtnetlink.h:145 [inline]
){+.+.}-{4:4}, at: register_netdev+0x18/0x50 net/core/dev.c:11111
3 locks held by kworker/u8:2/29708:
#0: ffff88810d3a6148
((wq_completion)ipv6_addrconf
){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1:
ffffc90004ae7d18
((work_completion)(&(&net->ipv6.addr_chk_work)->work)
){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffffffff8a3b7be8
(rtnl_mutex){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4738
6 locks held by kworker/1:7/30287:
#0: ffff8881066b3948 ((wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1:
ffffc90007567d18
((work_completion)(&hub->events)){+.+.}-{0:0}
, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff88810b70d198 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: hub_event+0x1be/0x5030 drivers/usb/core/hub.c:5863
#3: ffff8881373e1198
(&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline]
(&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
#4: ffff888112bc0160 (
&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:922 [inline]
, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
#5: ffffffff8a3b7be8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock_killable include/linux/rtnetlink.h:145 [inline]
#5: ffffffff8a3b7be8 (rtnl_mutex){+.+.}-{4:4}, at: register_netdev+0x18/0x50 net/core/dev.c:11111
1 lock held by syz.8.6277/31331:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.15.0-rc6-syzkaller-00177-g882826f58b2c #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:274 [inline]
watchdog+0xf70/0x12c0 kernel/hung_task.c:437
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 2879 Comm: dhcpcd Not tainted 6.15.0-rc6-syzkaller-00177-g882826f58b2c #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:info_print_prefix+0x0/0x350 kernel/printk/printk.c:1400
Code: 89 fb e8 83 96 20 00 48 89 de 48 c7 c7 a0 fa fc 88 5b e9 a3 33 c4 05 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <48> b8 00 00 00 00 00 fc ff df 41 57 41 56 41 89 f6 41 55 41 89 d5
RSP: 0018:ffffc900016d6de0 EFLAGS: 00000287
RAX: 0000000000000000 RBX: 000000000000002e RCX: ffffc900016d6e50
RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffffc900016d6f80
RBP: ffffc900016d6f40 R08: ffffc900016d6e50 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000af8190 R12: 0000000000000001
R13: 0000000000000800 R14: 0000000000000000 R15: ffffc900016d6f80
FS: 00007efdefe70740(0000) GS:ffff8882691c2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd221b2000 CR3: 000000010d34c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
record_print_text+0x140/0x400 kernel/printk/printk.c:1456
printk_get_next_message+0x2d1/0x6d0 kernel/printk/printk.c:3024
console_emit_next_record kernel/printk/printk.c:3092 [inline]
console_flush_all+0x6ea/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
__netdev_printk+0x1fb/0x500 net/core/dev.c:12393
netdev_err+0xe4/0x120 net/core/dev.c:12445
asix_set_sw_mii drivers/net/usb/asix_common.c:78 [inline]
asix_check_host_enable+0x18f/0x240 drivers/net/usb/asix_common.c:98
__asix_mdio_read+0x9c/0x260 drivers/net/usb/asix_common.c:506
asix_phy_reset+0x106/0x1f0 drivers/net/usb/asix_devices.c:215
ax88178_reset+0x42d/0x12f0 drivers/net/usb/asix_devices.c:1126
usbnet_open+0xcc/0xbf0 drivers/net/usb/usbnet.c:910
__dev_open+0x3a0/0x860 net/core/dev.c:1629
__dev_change_flags+0x55d/0x720 net/core/dev.c:9354
netif_change_flags+0x8d/0x160 net/core/dev.c:9417
dev_change_flags+0xb6/0x170 net/core/dev_api.c:68
devinet_ioctl+0x11d5/0x1f50 net/ipv4/devinet.c:1200
inet_ioctl+0x3a7/0x3f0 net/ipv4/af_inet.c:1001
sock_do_ioctl+0x115/0x280 net/socket.c:1190
sock_ioctl+0x42f/0x6a0 net/socket.c:1311
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl fs/ioctl.c:892 [inline]
__x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efdeff70378
Code: 00 00 48 8d 44 24 08 48 89 54 24 e0 48 89 44 24 c0 48 8d 44 24 d0 48 89 44 24 c8 b8 10 00 00 00 c7 44 24 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 07 89 d0 c3 0f 1f 40 00 48 8b 15 49 3a 0d
RSP: 002b:00007ffc4d970ad8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00007efdeff70378
RDX: 00007ffc4d980cd0 RSI: 0000000000008914 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc4d990e70
R13: 00007efdefe706c8 R14: 0000000000000028 R15: 0000000000008914