[....] Starting enhanced syslogd: rsyslogd[ 16.312694] audit: type=1400 audit(1517365900.028:4): avc: denied { syslog } for pid=3902 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?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 '10.128.0.20' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 27.903201] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 27.911494] IP: [] l2tp_session_create+0xc42/0x1770 [ 27.918195] PGD 80000001c9e4b067 [ 27.921457] PUD 1d7781067 PMD 0 [ 27.924955] [ 27.926594] Oops: 0002 [#1] PREEMPT SMP KASAN [ 27.931069] Dumping ftrace buffer: [ 27.934589] (ftrace buffer empty) [ 27.938280] Modules linked in: [ 27.941587] CPU: 1 PID: 4072 Comm: syzkaller611263 Not tainted 4.9.78-g7be1985 #33 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.949817] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.959156] task: ffff8801d4368000 task.stack: ffff8801d4558000 [ 27.965196] RIP: 0010:[] [] l2tp_session_create+0xc42/0x1770 [ 27.974340] RSP: 0018:ffff8801d455fab0 EFLAGS: 00010246 [ 27.979771] RAX: 0000000000000000 RBX: ffff8801baaef680 RCX: 0000000000000006 [ 27.987028] RDX: 1ffff1003755de60 RSI: ffff8801d43688b0 RDI: ffff8801baaef300 [ 27.994282] RBP: ffff8801d455fb50 R08: 0000000000000001 R09: 0000000000000000 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.001544] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801baaef1d8 [ 28.008805] R13: 0000000000007fff R14: 0000000000000000 R15: ffff8801baaef180 [ 28.016063] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7763b40 [ 28.024273] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.030141] CR2: 0000000000000080 CR3: 00000001d4ca0000 CR4: 0000000000160670 [ 28.037403] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.044758] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.052011] Stack: [ 28.054147] 0000000000000201 ffffffff83587c6e ffff8801d455fad0 ffffffff8123b84d [ 28.062174] ffff8801baaef180 ffff8801baaef1d8 ffff8801baaef7d8 ffff8801baaef7d0 [ 28.070202] ffff8801baaef730 ffff8801baaef1a0 0000000000000000 ffff8801baaef260 [ 28.078224] Call Trace: [ 28.080804] [] ? l2tp_session_get+0x1ce/0x770 [ 28.086935] [] ? trace_hardirqs_on+0xd/0x10 [ 28.092884] [] pppol2tp_connect+0x10fe/0x18f0 executing program executing program executing program executing program [ 28.099004] [] ? pppol2tp_seq_show+0xc20/0xc20 [ 28.105219] [] ? check_preemption_disabled+0x3b/0x200 [ 28.112038] [] ? check_stack_object+0x68/0x140 [ 28.118241] [] ? security_socket_connect+0x89/0xb0 [ 28.124792] [] SYSC_connect+0x1b6/0x310 [ 28.130390] [] ? SYSC_bind+0x280/0x280 [ 28.135899] [] ? memset+0x31/0x40 [ 28.140975] [] ? up_read+0x1a/0x40 [ 28.146135] [] ? __do_page_fault+0x3bd/0xd40 executing program executing program executing program executing program executing program [ 28.152174] [] SyS_connect+0x24/0x30 [ 28.157516] [] ? SyS_accept+0x30/0x30 [ 28.162942] [] do_fast_syscall_32+0x2f7/0x890 [ 28.169059] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.175697] [] entry_SYSENTER_compat+0x74/0x83 executing program executing program [ 28.181897] Code: 00 00 49 8d bf 80 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 d8 08 00 00 49 8b 87 80 01 00 00 ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 c8 [ 28.208567] RIP [] l2tp_session_create+0xc42/0x1770 [ 28.215325] RSP [ 28.218921] CR2: 0000000000000080 [ 28.223102] ---[ end trace 8faa7dc71f3f0d6b ]--- [ 28.227862] Kernel panic - not syncing: Fatal exception [ 28.233600] Dumping ftrace buffer: [ 28.237118] (ftrace buffer empty) [ 28.240795] Kernel Offset: disabled [ 28.244390] Rebooting in 86400 seconds..