[....] Starting enhanced syslogd: rsyslogd[ 12.697960] audit: type=1400 audit(1518250837.612:4): avc: denied { syslog } for pid=3652 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 30.739186] kasan: CONFIG_KASAN_INLINE enabled [ 30.743831] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 30.751168] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 30.757369] Dumping ftrace buffer: [ 30.760877] (ftrace buffer empty) [ 30.764555] Modules linked in: [ 30.767832] CPU: 0 PID: 3811 Comm: syzkaller169665 Not tainted 4.9.80-g8a174b47 #39 [ 30.775590] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.784914] task: ffff8801c0f24800 task.stack: ffff8801d7828000 [ 30.790938] RIP: 0010:[] [] ip6_xmit+0xb16/0x1b70 [ 30.799079] RSP: 0018:ffff8801d782f6c0 EFLAGS: 00010246 [ 30.804496] RAX: dffffc0000000000 RBX: ffff8801d8510640 RCX: ffffffff8341f9ec [ 30.811734] RDX: ffff8801d85106b8 RSI: ffffffff844de160 RDI: ffff8801d6a1d818 [ 30.818972] RBP: ffff8801d782f8d8 R08: 0000000000000001 R09: 0000000000000000 [ 30.826210] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ceaf7180 [ 30.833448] R13: 00000000000005b4 R14: ffff8801d99044e4 R15: 0000000000000040 [ 30.840688] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:000000000933b840 [ 30.848885] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 30.854734] CR2: 0000000020ea7ff8 CR3: 00000001d9858000 CR4: 0000000000160670 [ 30.861974] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.869216] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.876540] Stack: [ 30.878656] ffff8801d782f6d0 ffffffff8107c736 ffff8801d782f710 ffffffff81235370 [ 30.886621] ffffffff81236a01 0000001200000001 0000000000000000 1ffff1003af05ee6 [ 30.894582] ffff8801d8510708 ffff8801d8510698 ffff8801d85106b8 ffff8801ba319380 [ 30.902552] Call Trace: [ 30.905110] [] ? save_stack_trace+0x16/0x20 [ 30.911061] [] ? save_trace+0xe0/0x270 [ 30.916568] [] ? register_lock_class+0xae1/0x1340 [ 30.923029] [] ? ip6_finish_output2+0x1d20/0x1d20 [ 30.929491] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 30.936474] [] ? __lock_is_held+0xa1/0xf0 [ 30.942274] [] ? ipv4_dst_check+0x111/0x160 [ 30.948216] [] ? __sk_dst_check+0x10e/0x240 [ 30.954156] [] inet6_csk_xmit+0x27d/0x4d0 [ 30.959920] [] ? inet6_csk_xmit+0x100/0x4d0 [ 30.965866] [] ? inet6_csk_update_pmtu+0x160/0x160 [ 30.972416] [] l2tp_xmit_skb+0xcdc/0xf50 [ 30.978096] [] pppol2tp_sendmsg+0x5c0/0x7a0 [ 30.984038] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 30.990497] [] ? pppol2tp_release+0x2e0/0x2e0 [ 30.996613] [] sock_sendmsg+0xca/0x110 [ 31.002120] [] ___sys_sendmsg+0x6d1/0x7e0 [ 31.007886] [] ? copy_msghdr_from_user+0x550/0x550 [ 31.014434] [] ? __lock_is_held+0xa1/0xf0 [ 31.020216] [] ? __lru_cache_add+0x187/0x250 [ 31.026246] [] ? lru_cache_add+0xd9/0x1e0 [ 31.032017] [] ? handle_mm_fault+0xb12/0x2530 [ 31.038132] [] ? _raw_spin_unlock+0x2c/0x50 [ 31.044071] [] ? handle_mm_fault+0x6ee/0x2530 [ 31.050187] [] ? __fget_light+0x158/0x1e0 [ 31.055952] [] ? __fdget+0x18/0x20 [ 31.061115] [] ? sockfd_lookup_light+0x118/0x160 [ 31.067489] [] __sys_sendmsg+0xd6/0x190 [ 31.073081] [] ? SyS_shutdown+0x1b0/0x1b0 [ 31.078860] [] ? __do_page_fault+0x5ec/0xd40 [ 31.084889] [] compat_SyS_sendmsg+0x2a/0x40 [ 31.090828] [] ? compat_SyS_getsockopt+0x2a0/0x2a0 [ 31.097378] [] do_fast_syscall_32+0x2f7/0x890 [ 31.103490] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.110124] [] entry_SYSENTER_compat+0x74/0x83 [ 31.116321] Code: fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 4a 10 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 50 4d 8b a4 24 18 03 00 00 <65> 49 ff 44 24 28 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f [ 31.142868] RIP [] ip6_xmit+0xb16/0x1b70 [ 31.148666] RSP [ 31.152306] ---[ end trace fcbcf31dffa0ef0d ]--- [ 31.157042] Kernel panic - not syncing: Fatal exception in interrupt [ 31.163840] Dumping ftrace buffer: [ 31.167356] (ftrace buffer empty) [ 31.171036] Kernel Offset: disabled [ 31.174632] Rebooting in 86400 seconds..