[ 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 '10.128.10.45' (ECDSA) to the list of known hosts. syzkaller login: [ 30.495872][ T23] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 30.855793][ T23] usb 1-1: config 0 interface 0 altsetting 0 has an invalid endpoint with address 0x0, skipping [ 30.866378][ T23] usb 1-1: config 0 interface 0 altsetting 0 has an invalid endpoint descriptor of length 2, skipping [ 30.877375][ T23] usb 1-1: config 0 interface 0 altsetting 0 has 2 endpoint descriptors, different from the interface descriptor's value: 1 [ 31.045665][ T23] usb 1-1: New USB device found, idVendor=2040, idProduct=d863, bcdDevice=e4.77 [ 31.054697][ T23] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 31.062820][ T23] usb 1-1: Product: syz [ 31.067029][ T23] usb 1-1: Manufacturer: syz [ 31.071605][ T23] usb 1-1: SerialNumber: syz [ 31.078946][ T23] usb 1-1: config 0 descriptor?? [ 31.120083][ T23] usb 1-1: dvb_usb_v2: found a 'Hauppauge Mercury' in warm state [ 31.130451][ T23] usb 1-1: dvb_usb_v2: will pass the complete MPEG2 transport stream to the software demuxer [ 31.146986][ T23] dvbdev: DVB: registering new adapter (Hauppauge Mercury) [ 31.154324][ T23] usb 1-1: media controller created [ 31.164960][ T23] dvbdev: dvb_create_media_entity: media entity 'dvb-demux' registered. [ 31.183327][ T23] usb 1-1: selecting invalid altsetting 1 [ 31.190623][ T23] set interface failed [ 31.195525][ T23] ------------[ cut here ]------------ [ 31.205025][ T23] DEBUG_LOCKS_WARN_ON(lock->magic != lock) [ 31.205080][ T23] WARNING: CPU: 1 PID: 23 at kernel/locking/mutex.c:938 __mutex_lock+0xabc/0x10a0 [ 31.220117][ T23] Modules linked in: [ 31.224012][ T23] CPU: 1 PID: 23 Comm: kworker/1:1 Not tainted 5.10.0-rc1-syzkaller #0 [ 31.232377][ T23] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.242463][ T23] Workqueue: usb_hub_wq hub_event [ 31.247561][ T23] RIP: 0010:__mutex_lock+0xabc/0x10a0 [ 31.252918][ T23] Code: 08 84 d2 0f 85 a6 05 00 00 8b 05 07 02 a1 02 85 c0 0f 85 60 f6 ff ff 48 c7 c6 e0 01 e7 85 48 c7 c7 a0 ff e6 85 e8 0d d7 d7 ff <0f> 0b e9 46 f6 ff ff 65 48 8b 1c 25 40 ef 01 00 be