[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.177' (ECDSA) to the list of known hosts.
syzkaller login: [   34.339782][    T7] usb 1-1: new high-speed USB device number 2 using dummy_hcd
[   34.579560][    T7] usb 1-1: Using ep0 maxpacket: 32
[   34.739528][    T7] usb 1-1: unable to get BOS descriptor or descriptor too short
[   35.059372][    T7] usb 1-1: string descriptor 0 read error: -22
[   35.065719][    T7] usb 1-1: New USB device found, idVendor=0af0, idProduct=6811, bcdDevice=d7.8a
[   35.074794][    T7] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   35.085060][    T7] usb 1-1: config 0 descriptor??
[   35.130920][    T7] hso 1-1:0.0: Can't find BULK IN endpoint
[   35.137183][    T7] ------------[ cut here ]------------
[   35.143066][    T7] WARNING: CPU: 0 PID: 7 at net/core/dev.c:9388 rollback_registered_many+0x1f0/0x1490
[   35.152679][    T7] Modules linked in:
[   35.156582][    T7] CPU: 0 PID: 7 Comm: kworker/0:1 Not tainted 5.10.0-rc2-syzkaller #0
[   35.164995][    T7] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   35.175203][    T7] Workqueue: usb_hub_wq hub_event
[   35.180336][    T7] RIP: 0010:rollback_registered_many+0x1f0/0x1490
[   35.186759][    T7] Code: 05 00 00 31 ff 44 89 fe e8 0d 0c 95 fc 45 84 ff 0f 85 49 ff ff ff e8 af 13 95 fc 0f 1f 44 00 00 e8 a5 13 95 fc e8 a0 13 95 fc <0f> 0b 4c 89 ef e8 86 78 4d fd 31 ff 41 89 c5 89 c6 e8 da 0b 95 fc
[   35.206410][    T7] RSP: 0018:ffffc9000007ef80 EFLAGS: 00010293
[   35.212545][    T7] RAX: 0000000000000000 RBX: ffff888101632000 RCX: ffffffff84a9b883
[   35.220564][    T7] RDX: ffff888100289940 RSI: ffffffff84a9b8a0 RDI: 0000000000000001
[   35.228532][    T7] RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff8810b2e7
[   35.236554][    T7] R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000007f048
[   35.244579][    T7] R13: ffff888101632068 R14: ffffc9000007eff0 R15: 0000000000000000
[   35.252686][    T7] FS:  0000000000000000(0000) GS:ffff8881f6a00000(0000) knlGS:0000000000000000
[   35.261669][    T7] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   35.268246][    T7] CR2: 0000559e6c2d1160 CR3: 0000000007025000 CR4: 00000000001506f0
[   35.276250][    T7] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   35.284275][    T7] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   35.292307][    T7] Call Trace:
[   35.295602][    T7]  ? __mutex_lock+0x527/0x10a0
[   35.300530][    T7]  ? netdev_pick_tx+0xb60/0xb60
[   35.305401][    T7]  ? fs_reclaim_release+0x90/0xd0
[   35.310484][    T7]  ? lock_downgrade+0x6d0/0x6d0
[   35.315334][    T7]  ? mutex_lock_io_nested+0xf50/0xf50
[   35.320739][    T7]  unregister_netdevice_queue+0x2dd/0x570
[   35.326474][    T7]  ? unregister_netdevice_many+0x50/0x50