[  OK  ] Started Regular background program processing daemon.
         Starting getty on tty2-tty6 if dbus and logind are not available...
[  OK  ] Started Daily apt upgrade and clean activities.
         Starting System Logging Service...
[  OK  ] Started Daily Cleanup of Temporary Directories.
[  OK  ] Reached target Timers.
[  OK  ] Started Permit User Sessions.
[  OK  ] Started System Logging Service.
[  OK  ] Started OpenBSD Secure Shell server.
[  OK  ] Started getty on tty2-tty6 if dbus and logind are not available.
[  OK  ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch.
[  OK  ] Started Getty on tty6.
[  OK  ] Started Getty on tty5.
[  OK  ] Started Getty on tty4.
[  OK  ] Started Getty on tty3.
[  OK  ] Started Getty on tty2.
[  OK  ] Started Serial Getty on ttyS0.
[  OK  ] Started Getty on tty1.
[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[  OK  ] Started Load/Save RF Kill Switch Status.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.120' (ECDSA) to the list of known hosts.
syzkaller login: [   69.814832][   T28] audit: type=1400 audit(1598527959.044:8): avc:  denied  { execmem } for  pid=6858 comm="syz-executor858" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1
[   70.884581][ T6859] IPVS: ftp: loaded support on port[0] = 21
executing program
[   70.973611][ T6865] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
[   70.985353][ T6865] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
[   70.993767][ T6865] CPU: 0 PID: 6865 Comm: kworker/u5:2 Not tainted 5.9.0-rc2-syzkaller #0
[   71.002156][ T6865] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   71.012203][ T6865] Workqueue: hci0 hci_rx_work
[   71.016873][ T6865] RIP: 0010:hci_phy_link_complete_evt.isra.0+0x23e/0x790
[   71.023872][ T6865] Code: 48 c1 ea 03 80 3c 02 00 0f 85 3e 05 00 00 48 8b 9d 30 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 da 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
[   71.043503][ T6865] RSP: 0018:ffffc90000f37a38 EFLAGS: 00010202
[   71.049550][ T6865] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87246ed3
[   71.057517][ T6865] RDX: 0000000000000002 RSI: ffffffff87246ee0 RDI: 0000000000000010
[   71.065556][ T6865] RBP: ffff88809ef3c000 R08: 0000000000000001 R09: ffff88808901caa0
[   71.073574][ T6865] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
[   71.081525][ T6865] R13: ffff88808e855138 R14: ffff888097a17c0b R15: 00000000000000c9
[   71.089566][ T6865] FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
[   71.098470][ T6865] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   71.105049][ T6865] CR2: 00000000200000c0 CR3: 000000009d183000 CR4: 00000000001506f0
[   71.113436][ T6865] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   71.121646][ T6865] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   71.129606][ T6865] Call Trace:
[   71.132889][ T6865]  hci_event_packet+0x4696/0x87a8
[   71.137897][ T6865]  ? lockdep_hardirqs_on_prepare+0x530/0x530
[   71.143855][ T6865]  ? __lock_acquire+0x16cb/0x5640
[   71.148859][ T6865]  ? hci_cmd_complete_evt+0xc6d0/0xc6d0
[   71.154385][ T6865]  ? lock_acquire+0x1f1/0xad0
[   71.159043][ T6865]  ? skb_dequeue+0x1c/0x180
[   71.163525][ T6865]  ? find_held_lock+0x2d/0x110
[   71.168703][ T6865]  ? mark_lock+0xbc/0x1710
[   71.173104][ T6865]  ? mark_held_locks+0x9f/0xe0
[   71.177848][ T6865]  ? _raw_spin_unlock_irqrestore+0x62/0xe0
[   71.183633][ T6865]  ? lockdep_hardirqs_on_prepare+0x354/0x530
[   71.189592][ T6865]  ? trace_hardirqs_on+0x5f/0x220
[   71.194594][ T6865]  ? lockdep_hardirqs_on+0x76/0xf0
[   71.199685][ T6865]  hci_rx_work+0x22e/0xb50
[   71.204088][ T6865]  process_one_work+0x94c/0x1670
[   71.209006][ T6865]  ? lock_release+0x8e0/0x8e0
[   71.213664][ T6865]  ? pwq_dec_nr_in_flight+0x2d0/0x2d0
[   71.219013][ T6865]  ? rwlock_bug.part.0+0x90/0x90
[   71.223931][ T6865]  worker_thread+0x64c/0x1120
[   71.228594][ T6865]  ? __kthread_parkme+0x13f/0x1e0
[   71.233595][ T6865]  ? process_one_work+0x1670/0x1670
[   71.238769][ T6865]  kthread+0x3b5/0x4a0
[   71.242816][ T6865]  ? __kthread_bind_mask+0xc0/0xc0
[   71.247906][ T6865]  ? __kthread_bind_mask+0xc0/0xc0
[   71.252998][ T6865]  ret_from_fork+0x1f/0x30
[   71.257392][ T6865] Modules linked in:
[   71.264540][ T6865] ---[ end trace d3ae26d4047098c9 ]---
[   71.270393][ T6865] RIP: 0010:hci_phy_link_complete_evt.isra.0+0x23e/0x790
[   71.277413][ T6865] Code: 48 c1 ea 03 80 3c 02 00 0f 85 3e 05 00 00 48 8b 9d 30 09 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 da 04 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b
[   71.297622][ T6865] RSP: 0018:ffffc90000f37a38 EFLAGS: 00010202
[   71.303955][ T6865] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff87246ed3
[   71.312348][ T6865] RDX: 0000000000000002 RSI: ffffffff87246ee0 RDI: 0000000000000010
[   71.320741][ T6865] RBP: ffff88809ef3c000 R08: 0000000000000001 R09: ffff88808901caa0
[   71.328727][ T6865] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
[   71.336843][ T6865] R13: ffff88808e855138 R14: ffff888097a17c0b R15: 00000000000000c9
[   71.345202][ T6865] FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
[   71.354180][ T6865] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   71.354318][  T130] tipc: TX() has been purged, node left!
[   71.360820][ T6865] CR2: 00007f9ec0041178 CR3: 000000009e24c000 CR4: 00000000001506f0
[   71.360831][ T6865] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   71.360839][ T6865] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   71.360845][ T6865] Kernel panic - not syncing: Fatal exception
[   71.362443][ T6865] Kernel Offset: disabled
[   71.402280][ T6865] Rebooting in 86400 seconds..