INFO: task kworker/1:8:7072 blocked for more than 143 seconds. Not tainted 6.4.0-rc4-syzkaller-00151-g243ff7e6a035 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:8 state:D stack:21520 pid:7072 ppid:2 flags:0x00004000 Workqueue: ipv6_addrconf addrconf_verify_work Call Trace: context_switch kernel/sched/core.c:5343 [inline] __schedule+0xaa9/0x2f10 kernel/sched/core.c:6669 schedule+0xde/0x1a0 kernel/sched/core.c:6745 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6804 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747 addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4630 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 INFO: task kworker/0:7:14932 blocked for more than 143 seconds. Not tainted 6.4.0-rc4-syzkaller-00151-g243ff7e6a035 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:7 state:D stack:22352 pid:14932 ppid:2 flags:0x00004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5343 [inline] __schedule+0xaa9/0x2f10 kernel/sched/core.c:6669 schedule+0xde/0x1a0 kernel/sched/core.c:6745 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6804 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747 unregister_netdev+0x12/0x30 net/core/dev.c:10955 usbnet_disconnect+0xe6/0x510 drivers/net/usb/usbnet.c:1621 usb_unbind_interface+0x1dc/0x8e0 drivers/usb/core/driver.c:458 device_remove drivers/base/dd.c:569 [inline] device_remove+0x11f/0x170 drivers/base/dd.c:561 __device_release_driver drivers/base/dd.c:1272 [inline] device_release_driver_internal+0x443/0x610 drivers/base/dd.c:1295 bus_remove_device+0x22c/0x420 drivers/base/bus.c:574 device_del+0x399/0xa30 drivers/base/core.c:3814 usb_disable_device+0x360/0x7b0 drivers/usb/core/message.c:1420 usb_disconnect+0x2db/0x8a0 drivers/usb/core/hub.c:2238 hub_port_connect drivers/usb/core/hub.c:5246 [inline] hub_port_connect_change drivers/usb/core/hub.c:5551 [inline] port_event drivers/usb/core/hub.c:5711 [inline] hub_event+0x2073/0x4ed0 drivers/usb/core/hub.c:5793 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Showing all locks held in the system: 6 locks held by kworker/0:1/9: #0: ffff88810c668138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88810c668138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff88810c668138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1324 [inline] #0: ffff88810c668138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:643 [inline] #0: ffff88810c668138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:670 [inline] #0: ffff88810c668138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x883/0x15e0 kernel/workqueue.c:2376 #1: ffffc9000009fdb0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x15e0 kernel/workqueue.c:2380 #2: ffff888105bec190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline] #2: ffff888105bec190 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c0/0x4ed0 drivers/usb/core/hub.c:5739 #3: ffff888137291190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline] (&dev->mutex){....}-{3:3}, at: __device_attach+0x76/0x4b0 drivers/base/dd.c:1005 #4: ffff88810b272160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline] (&dev->mutex){....}-{3:3}, at: __device_attach+0x76/0x4b0 drivers/base/dd.c:1005 #5: ffffffff88d21828 (rtnl_mutex ){+.+.}-{3:3} , at: register_netdev+0x15/0x50 net/core/dev.c:10211 1 lock held by rcu_tasks_kthre/12: #0: ffffffff87c9f270 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:518 1 lock held by rcu_tasks_trace/13: #0: ffffffff87c9ef70 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:518 1 lock held by khungtaskd/28: #0: ffffffff87c9fe80 (rcu_read_lock ){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6559 3 locks held by dhcpcd/2391: 2 locks held by getty/2411: #0: ffff888102f2a098 (&tty->ldisc_sem ){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000452f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2176 3 locks held by kworker/0:5/5294: #0: ffff8881093e9138 ((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:1324 [inline] , at: set_work_data kernel/workqueue.c:643 [inline] , at: set_work_pool_and_clear_pending kernel/workqueue.c:670 [inline] , at: process_one_work+0x883/0x15e0 kernel/workqueue.c:2376 #1: ffffc90001e7fdb0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0} , at: process_one_work+0x8b7/0x15e0 kernel/workqueue.c:2380 #2: ffffffff88d21828 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4630 5 locks held by kworker/0:6/5308: 6 locks held by kworker/1:5/5431: #0: ffff88810c668138 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1324 [inline] ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:643 [inline] ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:670 [inline] ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x883/0x15e0 kernel/workqueue.c:2376 #1: ffffc90002cdfdb0 ((work_completion)(&hub->events) ){+.+.}-{0:0}, at: process_one_work+0x8b7/0x15e0 kernel/workqueue.c:2380 #2: ffff888105b29190 (&dev->mutex ){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline] ){....}-{3:3}, at: hub_event+0x1c0/0x4ed0 drivers/usb/core/hub.c:5739 #3: ffff88811c999190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline] #3: ffff88811c999190 (&dev->mutex){....}-{3:3}, at: __device_attach+0x76/0x4b0 drivers/base/dd.c:1005 #4: ffff88813696a160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline] ffff88813696a160 (&dev->mutex){....}-{3:3}, at: __device_attach+0x76/0x4b0 drivers/base/dd.c:1005 #5: ffffffff88d21828 (rtnl_mutex){+.+.}-{3:3}, at: register_netdev+0x15/0x50 net/core/dev.c:10211 3 locks held by kworker/1:8/7072: #0: ffff8881093e9138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881093e9138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff8881093e9138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1324 [inline] #0: ffff8881093e9138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:643 [inline] #0: ffff8881093e9138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:670 [inline] #0: ffff8881093e9138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x883/0x15e0 kernel/workqueue.c:2376 #1: ffffc900056c7db0 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x15e0 kernel/workqueue.c:2380 #2: ffffffff88d21828 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4630 6 locks held by kworker/0:7/14932: #0: ffff88810c668138 ((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:1324 [inline] , at: set_work_data kernel/workqueue.c:643 [inline] , at: set_work_pool_and_clear_pending kernel/workqueue.c:670 [inline] , at: process_one_work+0x883/0x15e0 kernel/workqueue.c:2376 #1: ffffc9000f007db0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x15e0 kernel/workqueue.c:2380 #2: ffff8881057b0190 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline] (&dev->mutex){....}-{3:3}, at: hub_event+0x1c0/0x4ed0 drivers/usb/core/hub.c:5739 #3: ffff8881349b8190 (&dev->mutex){....}-{3:3} , at: device_lock include/linux/device.h:837 [inline] , at: usb_disconnect+0xff/0x8a0 drivers/usb/core/hub.c:2229 #4: ffff888116a7e160 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:837 [inline] #4: ffff888116a7e160 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1095 [inline] #4: ffff888116a7e160 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xa4/0x610 drivers/base/dd.c:1292 #5: ffffffff88d21828 (rtnl_mutex){+.+.}-{3:3} , at: unregister_netdev+0x12/0x30 net/core/dev.c:10955 2 locks held by kworker/1:0/16186: 4 locks held by udevd/20525: #0: ffff88813734b668 ( &p->lock){+.+.}-{3:3} , at: seq_read_iter+0xe3/0x12d0 fs/seq_file.c:182 #1: ffff88811a228088 (&of->mutex){+.+.}-{3:3}, at: kernfs_seq_start+0x4b/0x450 fs/kernfs/file.c:154 #2: ffff888104b31e88 (kn->active#25){++++}-{0:0}, at: kernfs_seq_start+0x75/0x450 fs/kernfs/file.c:155 #3: ffff888137c22190 (&dev->mutex ){....}-{3:3}, at: device_lock_interruptible include/linux/device.h:842 [inline] ){....}-{3:3}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142 4 locks held by udevd/20526: #0: ffff88813a8dcb08 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0xe3/0x12d0 fs/seq_file.c:182 #1: ffff888112b2a488 ( &of->mutex){+.+.}-{3:3} , at: kernfs_seq_start+0x4b/0x450 fs/kernfs/file.c:154 #2: ffff8881270f9748 (kn->active#25){++++}-{0:0} , at: kernfs_seq_start+0x75/0x450 fs/kernfs/file.c:155 #3: ffff888137291190 (&dev->mutex ){....}-{3:3}, at: device_lock_interruptible include/linux/device.h:842 [inline] ){....}-{3:3}, at: manufacturer_show+0x26/0xa0 drivers/usb/core/sysfs.c:142 5 locks held by kworker/0:8/24523: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.4.0-rc4-syzkaller-00151-g243ff7e6a035 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 nmi_cpu_backtrace+0x29c/0x350 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x273/0x2d0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xe16/0x1090 kernel/hung_task.c:379 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2391 Comm: dhcpcd Not tainted 6.4.0-rc4-syzkaller-00151-g243ff7e6a035 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 RIP: 0010:collect_expired_timers+0x0/0x200 kernel/time/timer.c:1761 Code: 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 55 48 89 fd e8 53 f9 10 00 48 89 ef 5d 48 c7 c6 a0 f3 69 86 e9 d3 3a fc 00 0f 1f 00 <41> 57 41 56 41 55 49 89 f5 41 54 55 53 48 89 fb 48 83 ec 18 48 89 RSP: 0018:ffffc90000188e70 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000100 RDX: ffff8881139bd700 RSI: ffffc90000188ec0 RDI: ffff8881f6729480 RBP: ffffc90000188ec0 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000030a19 R12: ffff8881f6729480 R13: 0000000000000101 R14: dffffc0000000000 R15: fffffbfff0f41e40 FS: 00007fe53ef26740(0000) GS:ffff8881f6700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f83b5a54110 CR3: 000000011cfd6000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __run_timers kernel/time/timer.c:2008 [inline] __run_timers kernel/time/timer.c:1995 [inline] run_timer_softirq+0x2bf/0x910 kernel/time/timer.c:2035 __do_softirq+0x1c1/0x8e8 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu kernel/softirq.c:650 [inline] irq_exit_rcu+0x11b/0x190 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x92/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1979 [inline] RIP: 0010:vprintk_emit+0x3fe/0x600 kernel/printk/printk.c:2306 Code: 66 1b 00 48 85 db 0f 85 da 01 00 00 e8 6b 6a 1b 00 31 ff 4c 89 f6 e8 a1 66 1b 00 4d 85 f6 74 06 e8 57 6a 1b 00 fb f3 0f 1e fa 4d 6a 1b 00 45 31 c9 41 b8 01 00 00 00 31 c9 68 2a c0 2f 81 ba RSP: 0018:ffffc9000148f368 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff8881139bd700 RSI: ffffffff812fc029 RDI: 0000000000000007 RBP: ffffc9000148f3a0 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000037 R13: ffff888106a40000 R14: 0000000000000200 R15: ffffc9000148f3d0 dev_vprintk_emit drivers/base/core.c:4840 [inline] dev_printk_emit+0xda/0x120 drivers/base/core.c:4851 __netdev_printk+0x1dd/0x470 net/core/dev.c:11263 netdev_err+0xdc/0x120 net/core/dev.c:11315 asix_set_sw_mii drivers/net/usb/asix_common.c:78 [inline] asix_check_host_enable+0x19b/0x230 drivers/net/usb/asix_common.c:98 __asix_mdio_read+0x93/0x260 drivers/net/usb/asix_common.c:506 asix_phy_reset+0x108/0x1f0 drivers/net/usb/asix_devices.c:215 ax88178_reset+0x41f/0x13b0 drivers/net/usb/asix_devices.c:1126 usbnet_open+0xcc/0xbe0 drivers/net/usb/usbnet.c:887 __dev_open+0x297/0x4d0 net/core/dev.c:1415 __dev_change_flags+0x587/0x750 net/core/dev.c:8566 dev_change_flags+0x97/0x170 net/core/dev.c:8638 devinet_ioctl+0x15fb/0x1df0 net/ipv4/devinet.c:1150 inet_ioctl+0x33f/0x380 net/ipv4/af_inet.c:977 sock_do_ioctl+0xcc/0x230 net/socket.c:1201 sock_ioctl+0x1f8/0x680 net/socket.c:1318 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+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fe53eff4d49 Code: 5c c3 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 <41> 89 c0 3d 00 f0 ff ff 76 10 48 8b 15 ae 60 0d 00 f7 d8 41 83 c8 RSP: 002b:00007fff2f990758 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe53ef266c0 RCX: 00007fe53eff4d49 RDX: 00007fff2f9a0948 RSI: 0000000000008914 RDI: 0000000000000005 RBP: 00007fff2f9b0b08 R08: 00007fff2f9a0908 R09: 00007fff2f9a08b8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff2f9a0948 R14: 0000000000000028 R15: 0000000000008914