[ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.197' (ECDSA) to the list of known hosts. syzkaller login: [ 73.374263][ T3504] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 73.614203][ T3504] usb 1-1: Using ep0 maxpacket: 32 [ 73.774266][ T3504] usb 1-1: unable to get BOS descriptor or descriptor too short [ 74.094401][ T3504] usb 1-1: string descriptor 0 read error: -22 [ 74.100918][ T3504] usb 1-1: New USB device found, idVendor=0af0, idProduct=6811, bcdDevice=d7.8a [ 74.110650][ T3504] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 74.122903][ T3504] usb 1-1: config 0 descriptor?? [ 74.166342][ T3504] hso 1-1:0.0: Can't find BULK IN endpoint [ 74.173109][ T3504] ------------[ cut here ]------------ [ 74.179885][ T3504] WARNING: CPU: 1 PID: 3504 at net/core/dev.c:10972 unregister_netdevice_many+0x207/0x1790 [ 74.190474][ T3504] Modules linked in: [ 74.194563][ T3504] CPU: 1 PID: 3504 Comm: kworker/1:2 Not tainted 5.13.0-rc1-next-20210510-syzkaller #0 [ 74.204665][ T3504] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.214862][ T3504] Workqueue: usb_hub_wq hub_event [ 74.219934][ T3504] RIP: 0010:unregister_netdevice_many+0x207/0x1790 [ 74.226784][ T3504] Code: 05 00 00 31 ff 44 89 fe e8 66 70 69 fa 45 84 ff 0f 85 49 ff ff ff e8 a8 69 69 fa 0f 1f 44 00 00 e8 9e 69 69 fa e8 99 69 69 fa <0f> 0b 4c 89 ef e8 af 9e c7 fc 31 ff 41 89 c5 89 c6 e8 33 70 69 fa [ 74.246527][ T3504] RSP: 0018:ffffc90002faef30 EFLAGS: 00010293 [ 74.252753][ T3504] RAX: 0000000000000000 RBX: ffff88801dbe2000 RCX: 0000000000000000 [ 74.260839][ T3504] RDX: ffff8880215f0000 RSI: ffffffff870b7c27 RDI: 0000000000000003 [ 74.268941][ T3504] RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 [ 74.277020][ T3504] R10: ffffffff870b7c0a R11: 0000000000000000 R12: ffffc90002faf000 [ 74.285107][ T3504] R13: ffff88801dbe2060 R14: ffffc90002faefa0 R15: 0000000000000000 [ 74.293082][ T3504] FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 74.302161][ T3504] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 74.308997][ T3504] CR2: 000055cec915a180 CR3: 000000001884b000 CR4: 00000000001506e0 [