------------[ cut here ]------------ URB 0000000042df3bc7 submitted while active WARNING: CPU: 1 PID: 21496 at drivers/usb/core/urb.c:363 usb_submit_urb+0x11cf/0x14e0 drivers/usb/core/urb.c:363 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 21496 Comm: kworker/1:1 Not tainted 4.20.0-rc1+ #332 kobject: 'loop3' (0000000048dc8cd2): fill_kobj_path: path = '/devices/virtual/block/loop3' Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient hub_init_func2 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 panic+0x2ad/0x55c kernel/panic.c:188 __warn.cold.8+0x20/0x45 kernel/panic.c:540 kobject: 'loop4' (00000000430f2fa9): kobject_uevent_env report_bug+0x254/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290 kobject: 'loop4' (00000000430f2fa9): fill_kobj_path: path = '/devices/virtual/block/loop4' invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969 RIP: 0010:usb_submit_urb+0x11cf/0x14e0 drivers/usb/core/urb.c:363 Code: ee e8 95 62 7b fc 45 84 ed 0f 85 e2 f6 ff ff e8 b7 61 7b fc 48 89 de 48 c7 c7 a0 32 92 88 c6 05 d4 45 0d 05 01 e8 11 c5 44 fc <0f> 0b e9 c0 f6 ff ff c7 45 a0 01 00 00 00 e9 65 f7 ff ff 41 bc ed RSP: 0018:ffff888180c3f4f0 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff8881cd0b3e00 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8165e7e5 RDI: 0000000000000005 RBP: ffff888180c3f560 R08: ffff8881d2e60180 R09: ffffed103b5e3ef8 R10: ffffed103b5e3ef8 R11: ffff8881daf1f7c7 R12: 00000000fffffff0 R13: 0000000000000000 R14: 0000000000000009 R15: ffff888180c3f6f8 hub_activate+0xcab/0x1940 drivers/usb/core/hub.c:1215 hub_init_func2+0x1e/0x30 drivers/usb/core/hub.c:1240 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 kobject: 'loop1' (0000000090060015): kobject_uevent_env kobject: 'loop1' (0000000090060015): fill_kobj_path: path = '/devices/virtual/block/loop1' worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..