[info] Using makefile-style concurrent boot in runlevel 2. [ 14.615456][ C1] random: crng init done [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.57' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 24.784193][ T95] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 24.874432][ T95] usb 1-1: Using ep0 maxpacket: 32 [ 24.994770][ T95] usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x85 has an invalid bInterval 0, changing to 7 [ 25.005838][ T95] usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x85 has invalid wMaxPacketSize 0 [ 25.015665][ T95] usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x6 has an invalid bInterval 0, changing to 7 [ 25.026493][ T95] usb 1-1: config 0 interface 0 altsetting 0 endpoint 0x6 has invalid wMaxPacketSize 0 [ 25.194299][ T95] usb 1-1: New USB device found, idVendor=10cf, idProduct=5500, bcdDevice=a9.f3 [ 25.203488][ T95] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 25.211570][ T95] usb 1-1: Product: syz [ 25.215781][ T95] usb 1-1: Manufacturer: syz [ 25.220736][ T95] usb 1-1: SerialNumber: syz [ 25.227195][ T95] usb 1-1: config 0 descriptor?? [ 25.267680][ T95] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN [ 25.279729][ T95] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] [ 25.288448][ T95] CPU: 1 PID: 95 Comm: kworker/1:2 Not tainted 5.6.0-rc3-syzkaller #0 [ 25.296698][ T95] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.307071][ T95] Workqueue: usb_hub_wq hub_event [ 25.312207][ T95] RIP: 0010:vmk80xx_write_packet+0x75/0x260 [ 25.318192][ T95] Code: 48 8d 7b 68 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 d3 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 6b 68 4c 89 ea 48 c1 ea 03 <0f> b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 84 01 00 00 [ 25.338763][ T95] RSP: 0018:ffff8881d54ff1e0 EFLAGS: 00010202 [ 25.345190][ T95] RAX: dffffc0000000000 RBX: ffff8881d447b100 RCX: 0000000000000000 [ 25.353480][ T95] RDX: 0000000000000002 RSI: ffffffff848b3b23 RDI: ffff8881d447b168 [ 25.361656][ T95] RBP: ffff8881d1792400 R08: ffff8881d736c980 R09: 0000000000000010 [ 25.369738][ T95] R10: fffffbfff1266c95 R11: ffffffff893364af R12: ffff8881cefd7000 [ 25.377790][ T95] R13: 0000000000000010 R14: 0000000000000000 R15: ffff8881cffdb088 [ 25.385910][ T95] FS: 0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000 [ 25.395085][ T95] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.401830][ T95] CR2: 00000000008d5fd0 CR3: 00000001d1442000 CR4: 00000000001406e0 [ 25.410011][ T95] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.418355][ T95] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.426578][ T95] Call Trace: [ 25.429869][ T95] vmk80xx_auto_attach+0x13b1/0x17c0 [ 25.435441][ T95] comedi_auto_config+0x16e/0x250 [ 25.440587][ T95] usb_probe_interface+0x310/0x800 [ 25.445697][ T95] ? usb_probe_device+0x230/0x230 [ 25.450811][ T95] really_probe+0x290/0xac0 [ 25.455728][ T95] driver_probe_device+0x223/0x350 [ 25.461210][ T95] __device_attach_driver+0x1d1/0x290 [ 25.466758][ T95] ? driver_allows_async_probing+0x160/0x160 [ 25.472989][ T95] bus_for_each_drv+0x162/0x1e0 [ 25.477959][ T95] ? bus_rescan_devices+0x20/0x20 [ 25.482989][ T95] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 25.489378][ T95] ? lockdep_hardirqs_on+0x382/0x580 [ 25.494782][ T95] __device_attach+0x217/0x390 [ 25.499692][ T95] ? device_bind_driver+0xd0/0xd0 [ 25.504871][ T95] bus_probe_device+0x1e4/0x290 [ 25.509711][ T95] device_add+0x1459/0x1bf0 [ 25.514521][ T95] ? wait_for_completion+0x3c0/0x3c0 [ 25.519849][ T95] ? device_link_remove+0x110/0x110 [ 25.525131][ T95] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 25.531143][ T95] usb_set_configuration+0xe47/0x17d0 [ 25.536924][ T95] usb_generic_driver_probe+0x9d/0xe0 [ 25.542476][ T95] usb_probe_device+0xd9/0x230 [ 25.547395][ T95] ? usb_suspend+0x5f0/0x5f0 [ 25.552101][ T95] really_probe+0x290/0xac0 [ 25.556890][ T95] driver_probe_device+0x223/0x350 [ 25.561992][ T95] __device_attach_driver+0x1d1/0x290 [ 25.567699][ T95] ? driver_allows_async_probing+0x160/0x160 [ 25.573938][ T95] bus_for_each_drv+0x162/0x1e0 [ 25.578912][ T95] ? bus_rescan_devices+0x20/0x20 [ 25.583940][ T95] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 25.589972][ T95] ? lockdep_hardirqs_on+0x382/0x580 [ 25.595254][ T95] __device_attach+0x217/0x390 [ 25.600007][ T95] ? device_bind_driver+0xd0/0xd0 [ 25.605298][ T95] bus_probe_device+0x1e4/0x290 [ 25.610138][ T95] device_add+0x1459/0x1bf0 [ 25.615322][ T95] ? device_link_remove+0x110/0x110 [ 25.620608][ T95] usb_new_device.cold+0x540/0xcd0 [ 25.625707][ T95] hub_event+0x21cb/0x4300 [ 25.630365][ T95] ? hub_port_debounce+0x350/0x350 [ 25.635553][ T95] ? find_held_lock+0x2d/0x110 [ 25.640302][ T95] ? mark_held_locks+0xe0/0xe0 [ 25.645062][ T95] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 25.650610][ T95] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 25.655888][ T95] process_one_work+0x94b/0x1620 [ 25.660813][ T95] ? pwq_dec_nr_in_flight+0x310/0x310 [ 25.666335][ T95] ? do_raw_spin