[....] Starting enhanced syslogd: rsyslogd[ 12.161164] audit: type=1400 audit(1518594519.446:4): avc: denied { syslog } for pid=3643 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.6' (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 syzkaller login: [ 19.472283] request_module: runaway loop modprobe net-pf-10-proto-15-type-10 [ 19.472868] request_module: runaway loop modprobe net-pf-10-proto-15-type-10 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 19.472873] request_module: runaway loop modprobe net-pf-10-proto-15 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 19.473208] request_module: runaway loop modprobe net-pf-10-proto-15 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 19.474463] request_module: runaway loop modprobe net-pf-10-proto-15-type-10 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 19.474468] request_module: runaway loop modprobe net-pf-10-proto-15 [ 19.699586] SELinux: unrecognized netlink message: protocol=6 nlmsg_type=0 sclass=netlink_xfrm_socket pig=3846 comm=syzkaller759731 [ 20.043115] ------------[ cut here ]------------ [ 20.043132] WARNING: CPU: 1 PID: 4002 at net/xfrm/xfrm_policy.c:786 xfrm_policy_insert+0x6ff/0xda0 [ 20.043136] Kernel panic - not syncing: panic_on_warn set ... [ 20.043136] [ 20.043143] CPU: 1 PID: 4002 Comm: syzkaller759731 Not tainted 4.9.81-g1a93831 #33 [ 20.043146] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.043157] ffff8801d694f3a8 ffffffff81d94e69 ffffffff83a48080 ffff8801d694f480 [ 20.043165] ffffffff83f42a00 ffffffff833bf29f 0000000000000009 ffff8801d694f470 [ 20.043173] ffffffff8142f691 0000000041b58ab3 ffffffff8418b0a8 ffffffff8142f4d5 [ 20.043174] Call Trace: [ 20.043185] [] dump_stack+0xc1/0x128 [ 20.043192] [] ? xfrm_policy_insert+0x6ff/0xda0 [ 20.043201] [] panic+0x1bc/0x3a8 [ 20.043209] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 20.043216] [] ? load_image_and_restore+0xf9/0xf9 [ 20.043224] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 20.043232] [] ? __warn+0x1a9/0x1e0 [ 20.043239] [] ? xfrm_policy_insert+0x6ff/0xda0 [ 20.043245] [] __warn+0x1c4/0x1e0 [ 20.043252] [] warn_slowpath_null+0x2c/0x40 [ 20.043258] [] xfrm_policy_insert+0x6ff/0xda0 [ 20.043266] [] xfrm_add_policy+0x38f/0x660 [ 20.043274] [] ? security_capable+0x8e/0xc0 [ 20.043281] [] ? xfrm_add_acquire+0xd00/0xd00 [ 20.043289] [] ? ns_capable_common+0xcf/0x160 [ 20.043297] [] ? memset+0x31/0x40 [ 20.043306] [] ? nla_parse+0x213/0x260 [ 20.043312] [] ? xfrm_add_acquire+0xd00/0xd00 [ 20.043319] [] xfrm_user_rcv_msg+0x40d/0x6a0 [ 20.043326] [] ? xfrm_dump_sa_done+0xe0/0xe0 [ 20.043336] [] netlink_rcv_skb+0x13e/0x370 [ 20.043342] [] ? xfrm_dump_sa_done+0xe0/0xe0 [ 20.043348] [] xfrm_netlink_rcv+0x6f/0x90 [ 20.043354] [] netlink_unicast+0x511/0x750 [ 20.043361] [] ? netlink_unicast+0x43c/0x750 [ 20.043367] [] ? netlink_attachskb+0x680/0x680 [ 20.043374] [] netlink_sendmsg+0x8e8/0xc50 [ 20.043381] [] ? netlink_unicast+0x750/0x750 [ 20.043389] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 20.043397] [] ? security_socket_sendmsg+0x89/0xb0 [ 20.043404] [] ? netlink_unicast+0x750/0x750 [ 20.043413] [] sock_sendmsg+0xca/0x110 [ 20.043420] [] ___sys_sendmsg+0x6d1/0x7e0 [ 20.043429] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 20.043437] [] ? copy_msghdr_from_user+0x570/0x570 [ 20.043446] [] ? check_preemption_disabled+0x3b/0x200 [ 20.043453] [] ? __fget+0x231/0x3b0 [ 20.043459] [] ? __fget+0x47/0x3b0 [ 20.043466] [] ? __fget_light+0x169/0x1f0 [ 20.043472] [] ? __fdget+0x18/0x20 [ 20.043479] [] ? sockfd_lookup_light+0x118/0x160 [ 20.043485] [] __sys_sendmsg+0xd6/0x190 [ 20.043491] [] ? SyS_shutdown+0x1b0/0x1b0 [ 20.043500] [] ? __do_page_fault+0x5ec/0xd40 [ 20.043506] [] SyS_sendmsg+0x2d/0x50 [ 20.043512] [] ? __sys_sendmsg+0x190/0x190 [ 20.043519] [] do_syscall_64+0x1a5/0x490 [ 20.043526] [] entry_SYSCALL_64_after_swapgs+0x47/0xc5 [ 20.044079] Dumping ftrace buffer: [ 20.044113] (ftrace buffer empty) [ 20.044115] Kernel Offset: disabled [ 20.422539] Rebooting in 86400 seconds..