[info] Using makefile-style concurrent boot in runlevel 2.
[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[   14.404199][    C1] random: crng init done
[....] 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 '10.128.0.89' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   22.028480][   T83] usb 1-1: new high-speed USB device number 2 using dummy_hcd
[   22.388114][   T83] usb 1-1: New USB device found, idVendor=0681, idProduct=0009, bcdDevice=ed.98
[   22.397212][   T83] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[   22.406436][   T83] usb 1-1: config 0 descriptor??
[   22.450282][   T83] usb 1-1: gigaset_probe: Device matched ... !
[   22.456876][   T83] kcapi: controller [001]: usb_gigaset attached
[   22.464393][   T83] kasan: CONFIG_KASAN_INLINE enabled
[   22.469762][   T83] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   22.477813][   T83] general protection fault: 0000 [#1] SMP KASAN
[   22.484027][   T83] CPU: 1 PID: 83 Comm: kworker/1:2 Not tainted 5.4.0-rc6+ #0
[   22.491372][   T83] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   22.501406][   T83] Workqueue: usb_hub_wq hub_event
[   22.506416][   T83] RIP: 0010:gigaset_probe.cold+0x25d/0xd31
[   22.512193][   T83] Code: e0 2a 80 3c 02 00 74 0a 48 8b 7c 24 08 e8 e7 1d e9 fc 4d 8b 6f 18 ba ff ff 37 00 48 c1 e2 2a 49 8d 7d 04 48 89 f8 48 c1 e8 03 <0f> b6 0c 10 49 8d 45 05 48 89 c6 48 c1 ee 03 0f b6 14 16 48 89 fe
[   22.531774][   T83] RSP: 0018:ffff8881d89af2a0 EFLAGS: 00010247
[   22.537820][   T83] RAX: 0000000000000000 RBX: ffff8881cfa04000 RCX: ffffffff81e0ea0d
[   22.545768][   T83] RDX: dffffc0000000000 RSI: ffffffff834c66f6 RDI: 0000000000000004
[   22.553715][   T83] RBP: ffff8881cfa030a0 R08: ffff8881d8c5c800 R09: ffffed103b135e3b
[   22.561660][   T83] R10: ffffed103b135e3a R11: 0000000000000003 R12: ffff8881d203d180
[   22.569602][   T83] R13: 0000000000000000 R14: ffff8881d5344000 R15: ffff8881d300df88
[   22.577548][   T83] FS:  0000000000000000(0000) GS:ffff8881db300000(0000) knlGS:0000000000000000
[   22.586461][   T83] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   22.593037][   T83] CR2: 00000000018737d0 CR3: 00000001d15cf000 CR4: 00000000001406e0
[   22.600981][   T83] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   22.608923][   T83] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   22.616863][   T83] Call Trace:
[   22.620143][   T83]  usb_probe_interface+0x305/0x7a0
[   22.625258][   T83]  ? usb_probe_device+0x100/0x100
[   22.630255][   T83]  really_probe+0x281/0x6d0
[   22.634731][   T83]  driver_probe_device+0x104/0x210
[   22.639813][   T83]  __device_attach_driver+0x1c2/0x220
[   22.645167][   T83]  ? driver_allows_async_probing+0x160/0x160
[   22.651213][   T83]  bus_for_each_drv+0x162/0x1e0
[   22.656047][   T83]  ? bus_rescan_devices+0x20/0x20
[   22.661044][   T83]  ? _raw_spin_unlock_irqrestore+0x3e/0x50
[   22.666832][   T83]  ? lockdep_hardirqs_on+0x382/0x580
[   22.672094][   T83]  __device_attach+0x217/0x360
[   22.676829][   T83]  ? device_bind_driver+0xd0/0xd0
[   22.681822][   T83]  ? kobject_uevent_env+0x29e/0x1160
[   22.687084][   T83]  ? kobject_uevent_env+0x2a8/0x1160
[   22.692339][   T83]  bus_probe_device+0x1e4/0x290
[   22.697167][   T83]  ? blocking_notifier_call_chain+0x54/0xa0
[   22.703035][   T83]  device_add+0xae6/0x16f0
[   22.707436][   T83]  ? uevent_store+0x50/0x50
[   22.711913][   T83]  ? _raw_spin_unlock_irqrestore+0x3e/0x50
[   22.717699][   T83]  usb_set_configuration+0xdf6/0x1670
[   22.723077][   T83]  generic_probe+0x9d/0xd5
[   22.727463][   T83]  usb_probe_device+0x99/0x100
[   22.732196][   T83]  ? usb_suspend+0x620/0x620
[   22.736767][   T83]  really_probe+0x281/0x6d0
[   22.741240][   T83]  driver_probe_device+0x104/0x210
[   22.746319][   T83]  __device_attach_driver+0x1c2/0x220
[   22.751662][   T83]  ? driver_allows_async_probing+0x160/0x160
[   22.757611][   T83]  bus_for_each_drv+0x162/0x1e0
[   22.762431][   T83]  ? bus_rescan_devices+0x20/0x20
[   22.767424][   T83]  ? _raw_spin_unlock_irqrestore+0x3e/0x50
[   22.773202][   T83]  ? lockdep_hardirqs_on+0x382/0x580
[   22.778456][   T83]  __device_attach+0x217/0x360
[   22.783191][   T83]  ? device_bind_driver+0xd0/0xd0
[   22.788184][   T83]  ? kobject_uevent_env+0x29e/0x1160
[   22.793440][   T83]  ? kobject_uevent_env+0x2a8/0x1160
[   22.798695][   T83]  bus_probe_device+0x1e4/0x290
[   22.803525][   T83]  ? blocking_notifier_call_chain+0x54/0xa0
[   22.809400][   T83]  device_add+0xae6/0x16f0
[   22.813785][   T83]  ? uevent_store+0x50/0x50
[   22.818260][   T83]  usb_new_device.cold+0x6a4/0xe79
[   22.823344][   T83]  hub_event+0x1df8/0x3800
[   22.827731][   T83]  ? hub_port_debounce+0x260/0x260
[   22.832811][   T83]  ? find_held_lock+0x2d/0x110
[   22.837543][   T83]  ? mark_held_locks+0xe0/0xe0
[   22.842277][   T83]  ? rcu_read_lock_sched_held+0x9c/0xd0
[   22.847789][   T83]  ? rcu_read_lock_bh_held+0xb