[....] Starting enhanced syslogd: rsyslogd[ 13.764819] audit: type=1400 audit(1517439633.576:4): avc: denied { syslog } for pid=3908 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 '10.128.0.42' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 47.729613] syzkaller047961 uses obsolete (PF_INET,SOCK_PACKET) [ 47.737228] ------------[ cut here ]------------ [ 47.741988] WARNING: CPU: 1 PID: 4080 at net/ipv6/ip6_fib.c:1320 fib6_repair_tree+0x57a/0x7c0 [ 47.750660] Kernel panic - not syncing: panic_on_warn set ... [ 47.750660] [ 47.757998] CPU: 1 PID: 4080 Comm: syzkaller047961 Not tainted 4.9.79-g71f1469 #34 [ 47.765676] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.775001] ffff8801d79af1a0 ffffffff81d94829 ffffffff83a47c40 ffff8801d79af278 [ 47.782982] ffffffff83f4b700 ffffffff8346d8ba 0000000000000009 ffff8801d79af268 [ 47.790954] ffffffff8142f531 0000000041b58ab3 ffffffff8418ab10 ffffffff8142f375 [ 47.798933] Call Trace: [ 47.801491] [] dump_stack+0xc1/0x128 [ 47.806841] [] ? fib6_repair_tree+0x57a/0x7c0 [ 47.812956] [] panic+0x1bc/0x3a8 [ 47.817942] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 47.826143] [] ? load_image_and_restore+0xf9/0xf9 [ 47.832604] [] ? fib6_walk+0xe5/0x150 [ 47.838027] [] ? __warn+0x1a9/0x1e0 [ 47.843275] [] ? fib6_repair_tree+0x57a/0x7c0 [ 47.849389] [] __warn+0x1c4/0x1e0 [ 47.854460] [] warn_slowpath_null+0x2c/0x40 [ 47.860402] [] fib6_repair_tree+0x57a/0x7c0 [ 47.866341] [] fib6_del+0x88a/0xa30 [ 47.871589] [] fib6_clean_node+0x336/0x4a0 [ 47.877444] [] ? fib6_del+0xa30/0xa30 [ 47.882862] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 47.889152] [] fib6_walk_continue+0x39b/0x620 [ 47.895269] [] ? trace_hardirqs_on+0xd/0x10 [ 47.901210] [] fib6_walk+0xd9/0x150 [ 47.906456] [] fib6_clean_tree+0xe5/0x130 [ 47.912222] [] ? fib6_remove_prefsrc+0x240/0x240 [ 47.918597] [] ? fib6_walk+0x150/0x150 [ 47.924106] [] ? fib6_del+0xa30/0xa30 [ 47.929527] [] ? fib6_remove_prefsrc+0x240/0x240 [ 47.935906] [] __fib6_clean_all+0xf9/0x230 [ 47.941760] [] ? fib6_purge_rt+0x2c0/0x2c0 [ 47.947616] [] ? fib6_remove_prefsrc+0x240/0x240 [ 47.953992] [] ? fib6_remove_prefsrc+0x240/0x240 [ 47.960365] [] fib6_clean_all+0x27/0x30 [ 47.965958] [] rt6_ifdown+0xa1/0x7f0 [ 47.971293] [] ? __lock_acquire+0x629/0x3640 [ 47.977320] [] ? rt6_clean_tohost+0x30/0x30 [ 47.983260] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 47.990158] [] addrconf_ifdown+0xd0/0x10f0 [ 47.996016] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 48.003001] [] ? mark_held_locks+0xaf/0x100 [ 48.008943] [] ? add_addr+0x180/0x180 [ 48.014364] [] ? __lock_is_held+0xa1/0xf0 [ 48.020130] [] addrconf_notify+0x948/0x2230 [ 48.026509] [] ? check_preemption_disabled+0x3b/0x200 [ 48.033319] [] ? inet6_ifinfo_notify+0x140/0x140 [ 48.039698] [] ? pktgen_device_event+0x464/0x6c0 [ 48.046074] [] ? ip_vs_dst_event+0x251/0x660 [ 48.052103] [] ? ip6mr_device_event+0x27/0x1d0 [ 48.058306] [] ? ndisc_netdev_event+0x90/0x3a0 [ 48.064526] [] notifier_call_chain+0x90/0x1a0 [ 48.070651] [] raw_notifier_call_chain+0x2d/0x40 [ 48.077028] [] call_netdevice_notifiers_info+0x51/0x90 [ 48.083925] [] dev_set_mtu+0x216/0x3b0 [ 48.089434] [] ? netdev_features_change+0xa0/0xa0 [ 48.095898] [] dev_ifsioc+0x46e/0x820 [ 48.101332] [] ? check_preemption_disabled+0x3b/0x200 [ 48.108141] [] ? register_gifconf+0x60/0x60 [ 48.114081] [] ? dev_load+0x84/0x1a0 [ 48.119412] [] dev_ioctl+0x1d5/0xd40 [ 48.124745] [] ? __lru_cache_add+0x187/0x250 [ 48.130770] [] ? dev_load+0x1a0/0x1a0 [ 48.136188] [] ? do_huge_pmd_anonymous_page+0xb05/0x10d0 [ 48.143260] [] sock_do_ioctl+0x94/0xb0 [ 48.148768] [] compat_sock_ioctl+0x8a1/0x1350 [ 48.154885] [] ? selinux_file_ioctl+0x355/0x530 [ 48.161181] [] ? __pmd_alloc+0x410/0x410 [ 48.166862] [] ? sock_ioctl+0x3d0/0x3d0 [ 48.172455] [] ? __do_page_fault+0x5ec/0xd40 [ 48.178482] [] ? security_file_ioctl+0x89/0xb0 [ 48.184685] [] compat_SyS_ioctl+0x15f/0x2050 [ 48.190713] [] ? sock_ioctl+0x3d0/0x3d0 [ 48.196307] [] ? do_ioctl+0x60/0x60 [ 48.201554] [] do_fast_syscall_32+0x2f7/0x890 [ 48.207670] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.214309] [] entry_SYSENTER_compat+0x74/0x83 [ 48.220970] Dumping ftrace buffer: [ 48.224512] (ftrace buffer empty) [ 48.228197] Kernel Offset: disabled [ 48.231808] Rebooting in 86400 seconds..