[....] Starting enhanced syslogd: rsyslogd[ 16.514787] audit: type=1400 audit(1517438828.800:4): avc: denied { syslog } for pid=3913 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 '10.128.0.38' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.325041] syzkaller552444 uses obsolete (PF_INET,SOCK_PACKET) [ 27.332501] ------------[ cut here ]------------ [ 27.337249] WARNING: CPU: 0 PID: 4063 at net/ipv6/ip6_fib.c:1320 fib6_repair_tree+0x57a/0x7c0 [ 27.345909] Kernel panic - not syncing: panic_on_warn set ... [ 27.345909] [ 27.353264] CPU: 0 PID: 4063 Comm: syzkaller552444 Not tainted 4.9.79-g71f1469 #25 [ 27.360940] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.370280] ffff8801c61e71e0 ffffffff81d94829 ffffffff83a47c40 ffff8801c61e72b8 [ 27.378269] ffffffff83f4b700 ffffffff8346d8ba 0000000000000009 ffff8801c61e72a8 [ 27.386262] ffffffff8142f531 0000000041b58ab3 ffffffff8418ab10 ffffffff8142f375 [ 27.394233] Call Trace: [ 27.396793] [] dump_stack+0xc1/0x128 [ 27.402130] [] ? fib6_repair_tree+0x57a/0x7c0 [ 27.408244] [] panic+0x1bc/0x3a8 [ 27.413238] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 27.421437] [] ? load_image_and_restore+0xf9/0xf9 [ 27.427994] [] ? fib6_walk+0xe5/0x150 [ 27.433419] [] ? __warn+0x1a9/0x1e0 [ 27.438672] [] ? fib6_repair_tree+0x57a/0x7c0 [ 27.444797] [] __warn+0x1c4/0x1e0 [ 27.449869] [] warn_slowpath_null+0x2c/0x40 [ 27.455813] [] fib6_repair_tree+0x57a/0x7c0 [ 27.461755] [] fib6_del+0x88a/0xa30 [ 27.467001] [] fib6_clean_node+0x336/0x4a0 [ 27.472855] [] ? fib6_del+0xa30/0xa30 [ 27.478278] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 27.484568] [] fib6_walk_continue+0x39b/0x620 [ 27.490685] [] ? trace_hardirqs_on+0xd/0x10 [ 27.496625] [] fib6_walk+0xd9/0x150 [ 27.501872] [] fib6_clean_tree+0xe5/0x130 [ 27.507640] [] ? fib6_remove_prefsrc+0x240/0x240 [ 27.514017] [] ? fib6_walk+0x150/0x150 [ 27.519532] [] ? fib6_del+0xa30/0xa30 [ 27.524977] [] ? fib6_remove_prefsrc+0x240/0x240 [ 27.524986] [] __fib6_clean_all+0xf9/0x230 [ 27.524993] [] ? fib6_purge_rt+0x2c0/0x2c0 [ 27.524999] [] ? fib6_remove_prefsrc+0x240/0x240 [ 27.525009] [] ? fib6_remove_prefsrc+0x240/0x240 [ 27.525015] [] fib6_clean_all+0x27/0x30 [ 27.525022] [] rt6_ifdown+0xa1/0x7f0 [ 27.525032] [] ? __lock_acquire+0x629/0x3640 [ 27.525039] [] ? rt6_clean_tohost+0x30/0x30 [ 27.525047] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.525054] [] addrconf_ifdown+0xd0/0x10f0 [ 27.525061] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.525068] [] ? mark_held_locks+0xaf/0x100 [ 27.525075] [] ? add_addr+0x180/0x180 [ 27.525081] [] ? __lock_is_held+0xa1/0xf0 [ 27.525087] [] addrconf_notify+0x948/0x2230 [ 27.525098] [] ? check_preemption_disabled+0x3b/0x200 [ 27.525103] [] ? inet6_ifinfo_notify+0x140/0x140 [ 27.525114] [] ? pktgen_device_event+0x464/0x6c0 [ 27.525122] [] ? ip_vs_dst_event+0x251/0x660 [ 27.525128] [] ? ip6mr_device_event+0x27/0x1d0 [ 27.525134] [] ? ndisc_netdev_event+0x90/0x3a0 [ 27.525142] [] notifier_call_chain+0x90/0x1a0 [ 27.525149] [] raw_notifier_call_chain+0x2d/0x40 [ 27.525157] [] call_netdevice_notifiers_info+0x51/0x90 [ 27.525163] [] dev_set_mtu+0x216/0x3b0 [ 27.525170] [] ? netdev_features_change+0xa0/0xa0 [ 27.525177] [] dev_ifsioc+0x46e/0x820 [ 27.525184] [] ? check_preemption_disabled+0x3b/0x200 [ 27.525190] [] ? register_gifconf+0x60/0x60 [ 27.525196] [] ? dev_load+0x84/0x1a0 [ 27.525202] [] dev_ioctl+0x1d5/0xd40 [ 27.525208] [] ? dev_load+0x1a0/0x1a0 [ 27.525214] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.525225] [] sock_do_ioctl+0x94/0xb0 [ 27.525231] [] sock_ioctl+0x2e0/0x3d0 [ 27.525238] [] ? compat_ifr_data_ioctl+0x1a0/0x1a0 [ 27.525245] [] do_vfs_ioctl+0x1aa/0x1140 [ 27.525251] [] ? ioctl_preallocate+0x220/0x220 [ 27.525258] [] ? selinux_file_ioctl+0x355/0x530 [ 27.525263] [] ? selinux_capable+0x40/0x40 [ 27.525269] [] ? up_read+0x1a/0x40 [ 27.525276] [] ? __do_page_fault+0x3bd/0xd40 [ 27.525282] [] ? security_file_ioctl+0x89/0xb0 [ 27.525288] [] SyS_ioctl+0x8f/0xc0 [ 27.525295] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 27.531910] Dumping ftrace buffer: [ 27.531947] (ftrace buffer empty) [ 27.531948] Kernel Offset: disabled [ 27.812744] Rebooting in 86400 seconds..