INFO: task kworker/0:7:5768 blocked for more than 143 seconds.
Not tainted 6.16.0-rc7-syzkaller-g51d4b0a44c82 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:7 state:D
stack:21736 pid:5768 tgid:5768 ppid:2 task_flags:0x4288060 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x1325/0x3b10 kernel/sched/core.c:6786
__schedule_loop kernel/sched/core.c:6864 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6879
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6936
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6c7/0xb90 kernel/locking/mutex.c:747
rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
rtnl_net_dev_lock+0x146/0x360 net/core/dev.c:2143
unregister_netdev+0x15/0x60 net/core/dev.c:12157
usbnet_disconnect+0x109/0x500 drivers/net/usb/usbnet.c:1648
usb_unbind_interface+0x1dd/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+0x2e1/0x9c0 drivers/usb/core/hub.c:2344
hub_port_connect drivers/usb/core/hub.c:5406 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5706 [inline]
port_event drivers/usb/core/hub.c:5870 [inline]
hub_event+0x1aa2/0x5060 drivers/usb/core/hub.c:5952
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
Showing all locks held in the system:
5 locks held by kworker/0:0/9:
1 lock held by khungtaskd/30:
#0: ffffffff890c8440 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff890c8440 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff890c8440 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6770
3 locks held by kworker/u8:3/47:
#0: ffff8881121f3948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90000527d10 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffffffff8a3d6ce8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff8a3d6ce8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4733
1 lock held by dhcpcd/2878:
2 locks held by getty/2901:
#0: ffff88811234a0a0
(&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/5200:
#0: ffff888133aea1c8
(&p->lock
){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x12c0 fs/seq_file.c:182
#1: ffff8881169d5488 (&of->mutex){+.+.}-{4:4}, at: kernfs_seq_start+0x4d/0x240 fs/kernfs/file.c:154
#2: ffff88813525e878
(kn->active#26){++++}-{0:0}, at: kernfs_seq_start+0x71/0x240 fs/kernfs/file.c:155
#3: ffff88811ef1f198 (&dev->mutex){....}-{4:4}, at: device_lock_interruptible include/linux/device.h:889 [inline]
#3: ffff88811ef1f198 (&dev->mutex){....}-{4:4}, at: serial_show+0x26/0xa0 drivers/usb/core/sysfs.c:143
6 locks held by kworker/0:7/5768:
#0: ffff888106eaed48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90012fd7d10 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2:
ffff88810b3f0198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
ffff88810b3f0198 (&dev->mutex){....}-{4:4}, at: hub_event+0x1be/0x5060 drivers/usb/core/hub.c:5898
#3: ffff8881194f8198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
#3: ffff8881194f8198 (&dev->mutex){....}-{4:4}, at: usb_disconnect+0x10a/0x9c0 drivers/usb/core/hub.c:2335
#4: ffff8881194fe160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
#4: ffff8881194fe160 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1094 [inline]
#4: ffff8881194fe160 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xa4/0x620 drivers/base/dd.c:1292
#5: ffffffff8a3d6ce8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#5: ffffffff8a3d6ce8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_dev_lock+0x146/0x360 net/core/dev.c:2143
6 locks held by kworker/1:7/14108:
#0: ffff888106eaed48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90014cffd10 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff88810b3d8198 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
#2: ffff88810b3d8198 (&dev->mutex){....}-{4:4}, at: hub_event+0x1be/0x5060 drivers/usb/core/hub.c:5898
#3: ffff88811ef1f198 (&dev->mutex){....}-{4:4}
, at: device_lock include/linux/device.h:884 [inline]
, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
#4: ffff88811e39c160 (&dev->mutex
){....}-{4:4}, at: device_lock include/linux/device.h:884 [inline]
){....}-{4:4}, at: __device_attach+0x7e/0x4b0 drivers/base/dd.c:1004
#5:
ffffffff8a3d6ce8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock_killable include/linux/rtnetlink.h:145 [inline]
ffffffff8a3d6ce8 (rtnl_mutex){+.+.}-{4:4}, at: register_netdev+0x18/0x50 net/core/dev.c:11218
4 locks held by kworker/u8:0/14398:
#0: ffff888100ac3948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc900148afd10
(net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2:
ffffffff8a3c0d50
(pernet_ops_rwsem
){++++}-{4:4}
, at: cleanup_net+0xad/0x890 net/core/net_namespace.c:662
#3: ffffffff8a3d6ce8
(rtnl_mutex
){+.+.}-{4:4}, at: ops_exit_rtnl_list net/core/net_namespace.c:174 [inline]
){+.+.}-{4:4}, at: ops_undo_list+0x7e9/0xab0 net/core/net_namespace.c:249
1 lock held by syz-executor/14459:
#0: ffffffff8a3d6ce8 (rtnl_mutex
){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: inet_rtm_newaddr+0x30c/0x1540 net/ipv4/devinet.c:979
1 lock held by syz-executor/14504:
#0:
ffffffff8a3d6ce8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
ffffffff8a3d6ce8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x30c/0x1540 net/ipv4/devinet.c:979
1 lock held by syz-executor/14643:
#0: ffffffff8a3d6ce8
(rtnl_mutex
){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
){+.+.}-{4:4}, at: inet_rtm_newaddr+0x30c/0x1540 net/ipv4/devinet.c:979
1 lock held by syz-executor/14677:
#0: ffffffff8a3d6ce8 (rtnl_mutex){+.+.}-{4:4}
, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
, at: inet_rtm_newaddr+0x30c/0x1540 net/ipv4/devinet.c:979
1 lock held by syz.0.2707/14760:
#0: ffffffff890d3a38
(rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a3/0x3c0 kernel/rcu/tree_exp.h:336
1 lock held by syz.2.2708/14761:
#0: ffffffff890d3a38
(rcu_state.exp_mutex
){+.+.}-{4:4}
, at: exp_funnel_lock+0x284/0x3c0 kernel/rcu/tree_exp.h:304
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.16.0-rc7-syzkaller-g51d4b0a44c82 #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:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 2878 Comm: dhcpcd Not tainted 6.16.0-rc7-syzkaller-g51d4b0a44c82 #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:mark_lock+0xa7/0x610 kernel/locking/lockdep.c:4725
Code: 00 00 74 7f 48 8b 54 24 68 65 48 2b 15 4a b2 11 0b 0f 85 e8 04 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 09 b2 d7 05 46 22 03 74 8d 41 bd 00 02 00 00 bb 09 00 00 00 eb 8e 44 8b 1d
RSP: 0018:ffffc90000007c10 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000005
RDX: 0000000000000008 RSI: ffff888100fbe1f8 RDI: ffff888100fbd700
RBP: ffffc90000007cb0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000050 R11: 0000000000000001 R12: ffff888100fbe1f8
R13: ffff888100fbe1f8 R14: 0000000000000000 R15: ffff888100fbd700
FS: 00007f690f668740(0000) GS:ffff888269160000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b4a1aabe50 CR3: 0000000118582000 CR4: 00000000003506f0
Call Trace:
mark_usage kernel/locking/lockdep.c:4677 [inline]
__lock_acquire+0x3e9/0x1c90 kernel/locking/lockdep.c:5194
lock_acquire kernel/locking/lockdep.c:5871 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828
seqcount_lockdep_reader_access include/linux/seqlock.h:72 [inline]
get_jiffies_update+0x19c/0x2a0 kernel/time/tick-sched.c:873
tmigr_handle_remote+0x296/0x380 kernel/time/timer_migration.c:1084
run_timer_softirq+0x35/0x40 kernel/time/timer.c:2407
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:console_trylock_spinning kernel/printk/printk.c:2061 [inline]
RIP: 0010:vprintk_emit+0x567/0x6d0 kernel/printk/printk.c:2449
Code: 00 4d 85 ed 0f 85 19 01 00 00 e8 04 17 20 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 62 12 20 00 48 85 ed 0f 85 25 01 00 00 e4 16 20 00 45 31 c9 41 b8 01 00 00 00 31 c9 48 8d 05 00 00 00
RSP: 0018:ffffc900015af218 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000038 RCX: ffffffff815d80cc
RDX: ffff888100fbd700 RSI: ffffffff815d80d6 RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 1ffff920002b5e45
R13: 0000000000000200 R14: ffff8881022fd700 R15: ffffc900015af2e0
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:12509
netdev_warn+0xe4/0x120 net/core/dev.c:12562
asix_write_cmd+0xf1/0x100 drivers/net/usb/asix_common.c:57
asix_set_sw_mii drivers/net/usb/asix_common.c:75 [inline]
asix_check_host_enable+0x154/0x240 drivers/net/usb/asix_common.c:98
__asix_mdio_read+0x9c/0x260 drivers/net/usb/asix_common.c:484
asix_phy_reset+0x106/0x1f0 drivers/net/usb/asix_devices.c:215
ax88178_reset+0x42d/0x12f0 drivers/net/usb/asix_devices.c:1124
usbnet_open+0xcf/0xbf0 drivers/net/usb/usbnet.c:910
__dev_open+0x3a3/0x860 net/core/dev.c:1683
__dev_change_flags+0x55d/0x720 net/core/dev.c:9458
netif_change_flags+0x8d/0x160 net/core/dev.c:9521
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+0x118/0x280 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:907 [inline]
__se_sys_ioctl fs/ioctl.c:893 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893
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: 0033:0x7f690f768378
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:00007fff4080e528 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00007f690f768378
RDX: 00007fff4081e720 RSI: 0000000000008914 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff4082e8c0
R13: 00007f690f6686c8 R14: 0000000000000028 R15: 0000000000008914