syzbot

INFO: task kworker/1:2:145 blocked for more than 143 seconds.
      Not tainted 6.0.0-rc3-syzkaller-00007-gdcf8e5633e2e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:2     state:D stack:23808 pid:  145 ppid:     2 flags:0x00004000
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5182 [inline]
 __schedule+0xadf/0x52b0 kernel/sched/core.c:6494
 schedule+0xda/0x1b0 kernel/sched/core.c:6570
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6629
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa44/0x1350 kernel/locking/mutex.c:747
 unregister_netdev+0xe/0x20 net/core/dev.c:10920
 usbnet_disconnect+0xd8/0x270 drivers/net/usb/usbnet.c:1615
 usb_unbind_interface+0x1d8/0x8e0 drivers/usb/core/driver.c:458
 device_remove drivers/base/dd.c:520 [inline]
 device_remove+0x11f/0x170 drivers/base/dd.c:512
 __device_release_driver drivers/base/dd.c:1209 [inline]
 device_release_driver_internal+0x4a1/0x700 drivers/base/dd.c:1235
 bus_remove_device+0x2e3/0x590 drivers/base/bus.c:529
 device_del+0x4f3/0xc80 drivers/base/core.c:3704
 usb_disable_device+0x356/0x7a0 drivers/usb/core/message.c:1419
 usb_disconnect.cold+0x259/0x6ed drivers/usb/core/hub.c:2235
 hub_port_connect drivers/usb/core/hub.c:5197 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5497 [inline]
 port_event drivers/usb/core/hub.c:5653 [inline]
 hub_event+0x1f86/0x4610 drivers/usb/core/hub.c:5735
 process_one_work+0x991/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8bf88830 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8bf88530
 (
rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}
, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507
1 lock held by khungtaskd/28:
 #0: 
ffffffff8bf89380
 (
rcu_read_lock
){....}-{1:2}
, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6492
6 locks held by kworker/1:2/145:
 #0: 
ffff888140138138
 (
(wq_completion)usb_hub_wq
){+.+.}-{0:0}
, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
, at: set_work_data kernel/workqueue.c:636 [inline]
, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260
 #1: ffffc9000211fda8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264
 #2: ffff8881474d9190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline]
 #2: ffff8881474d9190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1bc/0x4610 drivers/usb/core/hub.c:5681
 #3: 
ffff88802391c190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline]
ffff88802391c190 (&dev->mutex){....}-{3:3}, at: usb_disconnect.cold+0x43/0x6ed drivers/usb/core/hub.c:2226
 #4: ffff8880205de118 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:835 [inline]
 #4: ffff8880205de118 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1038 [inline]
 #4: ffff8880205de118 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa0/0x700 drivers/base/dd.c:1232
 #5: ffffffff8d7af668 (rtnl_mutex){+.+.}-{3:3}, at: unregister_netdev+0xe/0x20 net/core/dev.c:10920
5 locks held by dhcpcd/3185:
2 locks held by getty/3285:
 #0: ffff88814a974098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
 #1: ffffc90002d232f0
 (
&ldata->atomic_read_lock
){+.+.}-{3:3}
, at: n_tty_read+0xef0/0x13e0 drivers/tty/n_tty.c:2177
3 locks held by kworker/0:6/3689:
 #0: ffff88814a2e3538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff88814a2e3538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff88814a2e3538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
 #0: ffff88814a2e3538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:636 [inline]
 #0: ffff88814a2e3538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
 #0: ffff88814a2e3538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260
 #1: ffffc9000427fda8 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264
 #2: ffffffff8d7af668 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xe/0x20 net/ipv6/addrconf.c:4620
3 locks held by kworker/1:10/4029:
 #0: ffff88814a2e3538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}
, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1280 [inline]
, at: set_work_data kernel/workqueue.c:636 [inline]
, at: set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
, at: process_one_work+0x87a/0x1610 kernel/workqueue.c:2260
 #1: ffffc90004a47da8 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8ae/0x1610 kernel/workqueue.c:2264
 #2: 
ffffffff8d7af668
 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xe/0x20 net/ipv6/addrconf.c:4620
1 lock held by syz-executor.2/6322:
 #0: ffffffff8d7af668 (rtnl_mutex){+.+.}-{3:3}, at: __netlink_dump_start+0x16a/0x900 net/netlink/af_netlink.c:2344

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.0.0-rc3-syzkaller-00007-gdcf8e5633e2e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x46/0x14f lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xc18/0xf50 kernel/hung_task.c:369
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3185 Comm: dhcpcd Not tainted 6.0.0-rc3-syzkaller-00007-gdcf8e5633e2e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:arch_scale_freq_tick+0x252/0x310 arch/x86/kernel/cpu/aperfmperf.c:396
Code: 04 ea 4c 00 4d 39 e5 0f 82 5d bb 0a 08 e8 96 ed 4c 00 48 81 fb 00 04 00 00 b8 00 04 00 00 48 0f 47 d8 65 48 89 1d de 52 d3 7e <5b> 5d 41 5c 41 5d 41 5e e9 71 ed 4c 00 e8 6c ed 4c 00 31 d2 4c 89
RSP: 0018:ffffc90000007d58 EFLAGS: 00000097
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888018648000 RSI: 0000000000010001 RDI: 0000000000000000
RBP: 0000000000039640 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888018648000 R14: ffff8880b9a3acd8 R15: ffff8880b9a39f80
FS:  00007fdc8fe95740(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00cfdb440 CR3: 0000000020ad8000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 scheduler_tick+0x92/0x5e0 kernel/sched/core.c:5445
 update_process_times+0x13e/0x1a0 kernel/time/timer.c:1844
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:243
 tick_sched_timer+0xee/0x120 kernel/time/tick-sched.c:1480
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200
Code: 48 89 ef 5d e9 c1 c8 4b 00 5d be 03 00 00 00 e9 b6 43 81 02 66 0f 1f 44 00 00 48 8b be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 8b 05 09 65 86 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
RSP: 0018:ffffc9000313f2d8 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888018648000 RSI: ffffffff8161e561 RDI: 0000000000000007
RBP: ffffc9000313f318 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000037
R13: ffff888017570000 R14: 0000000000000200 R15: ffffc9000313f438
 console_trylock_spinning kernel/printk/printk.c:1922 [inline]
 vprintk_emit+0x3f7/0x5f0 kernel/printk/printk.c:2270
 dev_vprintk_emit+0x36e/0x3b2 drivers/base/core.c:4736
 dev_printk_emit+0xba/0xf1 drivers/base/core.c:4747
 __netdev_printk+0x1c6/0x27a net/core/dev.c:11228
 netdev_err+0xd7/0x109 net/core/dev.c:11280
 asix_set_sw_mii drivers/net/usb/asix_common.c:78 [inline]
 asix_check_host_enable.cold+0x22/0x66 drivers/net/usb/asix_common.c:98
 __asix_mdio_read+0x93/0x220 drivers/net/usb/asix_common.c:506
 asix_phy_reset+0x104/0x170 drivers/net/usb/asix_devices.c:215
 ax88178_reset+0x41b/0x13b0 drivers/net/usb/asix_devices.c:983
 usbnet_open+0xc8/0x5d0 drivers/net/usb/usbnet.c:889
 __dev_open+0x297/0x4d0 net/core/dev.c:1432
 __dev_change_flags+0x583/0x750 net/core/dev.c:8556
 dev_change_flags+0x93/0x170 net/core/dev.c:8627
 devinet_ioctl+0x1601/0x1ce0 net/ipv4/devinet.c:1146
 inet_ioctl+0x1e6/0x320 net/ipv4/af_inet.c:968
 sock_do_ioctl+0xcc/0x230 net/socket.c:1169
 sock_ioctl+0x2f1/0x640 net/socket.c:1286
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fdc8ff830e7
Code: 3c 1c e8 1c ff ff ff 85 c0 79 87 49 c7 c4 ff ff ff ff 5b 5d 4c 89 e0 41 5c c3 66 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 61 9d 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffcf9b1a068 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdc8fe956c8 RCX: 00007fdc8ff830e7
RDX: 00007ffcf9b2a258 RSI: 0000000000008914 RDI: 000000000000000f
RBP: 00007ffcf9b3a408 R08: 00007ffcf9b2a218 R09: 00007ffcf9b2a1c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcf9b2a258 R14: 0000000000000028 R15: 0000000000008914
 </TASK>