INFO: task kworker/1:1:21 blocked for more than 143 seconds. Not tainted 5.8.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:1 D22320 21 2 0x80004000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:3458 [inline] __schedule+0x8c9/0x1fe0 kernel/sched/core.c:4215 schedule+0xcd/0x2b0 kernel/sched/core.c:4290 schedule_timeout+0x148/0x250 kernel/time/timer.c:1908 usb_start_wait_urb.constprop.0+0x2ad/0x2f0 drivers/net/usb/kaweth.c:1238 kaweth_internal_control_msg drivers/net/usb/kaweth.c:1274 [inline] kaweth_control.constprop.0+0x361/0x4f0 drivers/net/usb/kaweth.c:269 kaweth_read_configuration drivers/net/usb/kaweth.c:287 [inline] kaweth_probe.cold+0xaa/0x12ec drivers/net/usb/kaweth.c:1065 usb_probe_interface+0x315/0x7f0 drivers/usb/core/driver.c:374 really_probe+0x291/0xc90 drivers/base/dd.c:520 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:696 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:802 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x28d/0x430 drivers/base/dd.c:868 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb09/0x1c10 drivers/base/core.c:2700 usb_set_configuration+0xf05/0x18a0 drivers/usb/core/message.c:2032 usb_generic_driver_probe+0xba/0xf2 drivers/usb/core/generic.c:241 usb_probe_device+0xd9/0x250 drivers/usb/core/driver.c:272 really_probe+0x291/0xc90 drivers/base/dd.c:520 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:696 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:802 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:431 __device_attach+0x28d/0x430 drivers/base/dd.c:868 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb09/0x1c10 drivers/base/core.c:2700 usb_new_device.cold+0x71d/0xfd4 drivers/usb/core/hub.c:2554 hub_port_connect drivers/usb/core/hub.c:5208 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x2361/0x4390 drivers/usb/core/hub.c:5576 process_one_work+0x94c/0x15f0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x392/0x470 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 INFO: task syz-executor.2:13698 blocked for more than 143 seconds. Not tainted 5.8.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28824 13698 373 0x80004006 Call Trace: context_switch kernel/sched/core.c:3458 [inline] __schedule+0x8c9/0x1fe0 kernel/sched/core.c:4215 schedule+0xcd/0x2b0 kernel/sched/core.c:4290 wdm_flush+0x2e9/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x170 fs/open.c:1282 close_files fs/file.c:388 [inline] put_files_struct fs/file.c:416 [inline] put_files_struct+0x1d0/0x350 fs/file.c:413 exit_files+0x7e/0xa0 fs/file.c:445 do_exit+0xb74/0x28f0 kernel/exit.c:800 do_group_exit+0x125/0x310 kernel/exit.c:903 get_signal+0x410/0x1ef0 kernel/signal.c:2743 do_signal+0x88/0x1a00 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:235 [inline] __prepare_exit_to_usermode+0x169/0x1a0 arch/x86/entry/common.c:269 do_syscall_64+0x5c/0x90 arch/x86/entry/common.c:393 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45a721 Code: Bad RIP value. RSP: 002b:00007ffc00c6e2c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000023 RAX: fffffffffffffdfc RBX: 0000000000081196 RCX: 000000000045a721 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffc00c6e2d0 RBP: 0000000000000001 R08: 00000000095863dc R09: 00000000095863e0 R10: 00007ffc00c6e3d0 R11: 0000000000000293 R12: 000000000078bf00 R13: 000000000078c900 R14: ffffffffffffffff R15: 000000000078c04c INFO: task syz-executor.5:13786 blocked for more than 144 seconds. Not tainted 5.8.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28824 13786 384 0x00000004 Call Trace: context_switch kernel/sched/core.c:3458 [inline] __schedule+0x8c9/0x1fe0 kernel/sched/core.c:4215 schedule+0xcd/0x2b0 kernel/sched/core.c:4290 wdm_flush+0x2e9/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x170 fs/open.c:1282 __close_fd+0x133/0x200 fs/file.c:641 __do_sys_close fs/open.c:1301 [inline] __se_sys_close fs/open.c:1299 [inline] __x64_sys_close+0x69/0x100 fs/open.c:1299 do_syscall_64+0x50/0x90 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x415d71 Code: Bad RIP value. RSP: 002b:00007ffefeea9ab0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000415d71 RDX: 0000000000000000 RSI: 000000000000083a RDI: 0000000000000004 RBP: 0000000000000001 R08: 00000000347da83a R09: 00000000347da83e R10: 00007ffefeea9ba0 R11: 0000000000000293 R12: 0000000000790890 R13: 0000000000080f09 R14: ffffffffffffffff R15: 000000000078bf0c INFO: task syz-executor.0:13847 blocked for more than 144 seconds. Not tainted 5.8.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28824 13847 370 0x80004006 Call Trace: context_switch kernel/sched/core.c:3458 [inline] __schedule+0x8c9/0x1fe0 kernel/sched/core.c:4215 schedule+0xcd/0x2b0 kernel/sched/core.c:4290 wdm_flush+0x2e9/0x3c0 drivers/usb/class/cdc-wdm.c:590 filp_close+0xb4/0x170 fs/open.c:1282 close_files fs/file.c:388 [inline] put_files_struct fs/file.c:416 [inline] put_files_struct+0x1d0/0x350 fs/file.c:413 exit_files+0x7e/0xa0 fs/file.c:445 do_exit+0xb74/0x28f0 kernel/exit.c:800 do_group_exit+0x125/0x310 kernel/exit.c:903 get_signal+0x410/0x1ef0 kernel/signal.c:2743 do_signal+0x88/0x1a00 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:235 [inline] __prepare_exit_to_usermode+0x169/0x1a0 arch/x86/entry/common.c:269 do_syscall_64+0x5c/0x90 arch/x86/entry/common.c:393 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c0c7 Code: Bad RIP value. RSP: 002b:00007f39b0055b88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffffc RBX: 0000000000000005 RCX: 000000000045c0c7 RDX: 00007f39b0056bf0 RSI: 0000000080085502 RDI: 0000000000000005 RBP: 0000000000000008 R08: 0000000000000302 R09: 0000000000000409 R10: 0900000d02000001 R11: 0000000000000246 R12: 00007f39b0055be8 R13: 0000000020000000 R14: 0000000000402040 R15: 0000000000000008 Showing all locks held in the system: 5 locks held by kworker/1:1/21: #0: ffff8881d885e938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881d885e938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8881d885e938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8881d885e938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8881d885e938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8881d885e938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x82b/0x15f0 kernel/workqueue.c:2240 #1: ffff8881da317da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x85f/0x15f0 kernel/workqueue.c:2244 #2: ffff8881d4540218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:769 [inline] #2: ffff8881d4540218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c5/0x4390 drivers/usb/core/hub.c:5522 #3: ffff8881ce6c1218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:769 [inline] #3: ffff8881ce6c1218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x430 drivers/base/dd.c:845 #4: ffff8881cece51a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:769 [inline] #4: ffff8881cece51a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x430 drivers/base/dd.c:845 1 lock held by khungtaskd/23: #0: ffffffff87312460 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x264 kernel/locking/lockdep.c:5779 1 lock held by in:imklog/254: #0: ffff8881c8d220f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 2 locks held by agetty/258: #0: ffff8881d02c1098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffffc90000a262e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x223/0x1a30 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 5.8.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xf6/0x16e lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x74/0xb6 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1da/0x1f4 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd6a/0xfd0 kernel/hung_task.c:295 kthread+0x392/0x470 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x72/0x90 drivers/acpi/processor_idle.c:111