worker_thread+0x96/0xe10 kernel/workqueue.c:2415 kthread+0x352/0x460 kernel/kthread.c:291 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 hso 5-1:0.0: Failed to find BULK IN ep general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067] CPU: 0 PID: 3069 Comm: kworker/0:3 Not tainted 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:596 Code: b5 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 83 93 d1 ff 48 8d 7d 64 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4f 48 RSP: 0018:ffff8881abfaf1c0 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff8881d51eb700 RCX: ffffc9000da7c000 RDX: 000000000000000c RSI: ffffffff816e1d2d RDI: 0000000000000064 RBP: 0000000000000000 R08: ffff8881d0f29900 R09: 0000000000000001 R10: ffffffff893946ef R11: fffffbfff12728dd R12: 0000000000000000 R13: ffff8881d490c000 R14: ffff8881d09a5000 R15: ffff8881cf53f070 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020004000 CR3: 00000001d33bf000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tty_unregister_device drivers/tty/tty_io.c:3193 [inline] tty_unregister_device+0x10d/0x1a0 drivers/tty/tty_io.c:3188 hso_serial_tty_unregister drivers/net/usb/hso.c:2232 [inline] hso_create_bulk_serial_device drivers/net/usb/hso.c:2678 [inline] hso_probe.cold+0x9f/0x173 drivers/net/usb/hso.c:2944 usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:374 really_probe+0x290/0xac0 drivers/base/dd.c:525 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:807 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x390 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb2b/0x1940 drivers/base/core.c:2680 usb_set_configuration+0xed4/0x1850 drivers/usb/core/message.c:2032 usb_generic_driver_probe+0x9d/0xe0 drivers/usb/core/generic.c:241 usb_probe_device+0xd9/0x230 drivers/usb/core/driver.c:272 really_probe+0x290/0xac0 drivers/base/dd.c:525 driver_probe_device+0x26b/0x3d0 drivers/base/dd.c:701 __device_attach_driver+0x1d1/0x290 drivers/base/dd.c:807 bus_for_each_drv+0x162/0x1e0 drivers/base/bus.c:431 __device_attach+0x21a/0x390 drivers/base/dd.c:873 bus_probe_device+0x1e4/0x290 drivers/base/bus.c:491 device_add+0xb2b/0x1940 drivers/base/core.c:2680 usb_new_device.cold+0x5a2/0xfd9 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+0x226d/0x43c0 drivers/usb/core/hub.c:5576 process_one_work+0x965/0x1620 kernel/workqueue.c:2269 worker_thread+0x96/0xe10 kernel/workqueue.c:2415 kthread+0x352/0x460 kernel/kthread.c:291 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Modules linked in: ---[ end trace 272d1c9f4ae13dbf ]--- RIP: 0010:cdev_del+0x22/0x90 fs/char_dev.c:596 Code: b5 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 ec 08 e8 83 93 d1 ff 48 8d 7d 64 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 4f 48 RSP: 0018:ffff8881abfaf1c0 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff8881d51eb700 RCX: ffffc9000da7c000 RDX: 000000000000000c RSI: ffffffff816e1d2d RDI: 0000000000000064 RBP: 0000000000000000 R08: ffff8881d0f29900 R09: 0000000000000001 R10: ffffffff893946ef R11: fffffbfff12728dd R12: 0000000000000000 R13: ffff8881d490c000 R14: ffff8881d09a5000 R15: ffff8881cf53f070 FS: 0000000000000000(0000) GS:ffff8881db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020004000 CR3: 00000001d33bf000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400