[ 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 '10.128.0.9' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 57.298019][ T2564] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 57.537936][ T2564] usb 1-1: Using ep0 maxpacket: 8 [ 57.658026][ T2564] usb 1-1: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 [ 57.669056][ T2564] usb 1-1: config 1 interface 0 altsetting 0 endpoint 0x82 has invalid wMaxPacketSize 0 [ 57.679976][ T2564] usb 1-1: config 1 interface 0 altsetting 0 bulk endpoint 0x82 has invalid maxpacket 0 [ 57.690434][ T2564] usb 1-1: config 1 interface 0 altsetting 0 endpoint 0x3 has invalid wMaxPacketSize 0 [ 57.700784][ T2564] usb 1-1: config 1 interface 0 altsetting 0 bulk endpoint 0x3 has invalid maxpacket 0 [ 57.867933][ T2564] usb 1-1: New USB device found, idVendor=0dba, idProduct=1000, bcdDevice= 0.40 [ 57.877170][ T2564] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 57.886139][ T2564] usb 1-1: Product: syz [ 57.891423][ T2564] usb 1-1: Manufacturer: syz [ 57.896024][ T2564] usb 1-1: SerialNumber: syz [ 57.977923][ T2564] cdc_ether: probe of 1-1:1.0 failed with error -22 [ 58.157846][ C1] ================================================================== [ 58.166239][ C1] BUG: KASAN: slab-out-of-bounds in snd_usb_mixer_notify_id+0x219/0x2a0 [ 58.174571][ C1] Write of size 4 at addr ffff8880945465e0 by task swapper/1/0 [ 58.182160][ C1] [ 58.184483][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-syzkaller #0 [ 58.192020][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.202054][ C1] Call Trace: [ 58.205331][ C1] [ 58.208172][ C1] dump_stack+0x188/0x20d [ 58.212485][ C1] ? snd_usb_mixer_notify_id+0x219/0x2a0 [ 58.218789][ C1] ? snd_usb_mixer_notify_id+0x219/0x2a0 [ 58.224418][ C1] print_address_description.constprop.0.cold+0xd3/0x413 [ 58.231502][ C1] ? vprintk_func+0x97/0x1a6 [ 58.236100][ C1] ? snd_usb_mixer_notify_id+0x219/0x2a0 [ 58.241720][ C1] kasan_report.cold+0x1f/0x37 [ 58.246469][ C1] ? snd_usb_mixer_notify_id+0x219/0x2a0 [ 58.252108][ C1] snd_usb_mixer_notify_id+0x219/0x2a0 [ 58.257561][ C1] snd_usb_mixer_interrupt+0x416/0x980 [ 58.263059][ C1] ? trace_hardirqs_off+0x50/0x220 [ 58.268173][ C1] __usb_hcd_giveback_urb+0x2af/0x4b0 [ 58.273561][ C1] usb_hcd_giveback_urb+0x368/0x420 [ 58.278841][ C1] dummy_timer+0x1243/0x2fe1 [ 58.283421][ C1] ? __lock_acquire+0x2224/0x48a0 [ 58.288433][ C1] ? debug_smp_processor_id+0x2f/0x185 [ 58.293884][ C1] ? dummy_dequeue+0x4c0/0x4c0 [ 58.298626][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 58.304236][ C1] ? rcu_read_lock_any_held.par