[....] Starting enhanced syslogd: rsyslogd[ 12.411301] audit: type=1400 audit(1519265648.427:4): avc: denied { syslog } for pid=3649 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 '10.128.0.27' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" executing program syzkaller login: [ 26.757904] ------------[ cut here ]------------ [ 26.762689] WARNING: CPU: 1 PID: 3805 at net/core/dev.c:2466 skb_warn_bad_offload+0x2af/0x390 [ 26.771355] syz0: caps=(0x00000400000058c1, 0x0000000000000000) len=90 data_len=0 gso_size=574 gso_type=5 ip_summed=0 [ 26.782094] Kernel panic - not syncing: panic_on_warn set ... [ 26.782094] [ 26.789428] CPU: 1 PID: 3805 Comm: syzkaller645362 Not tainted 4.9.82-g7ec482b #46 [ 26.797102] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.806429] ffff8801d9617378 ffffffff81d94fc9 ffffffff83a48080 ffff8801d9617450 [ 26.814395] ffffffff83ee3100 ffffffff82f3634f 0000000000000009 ffff8801d9617440 [ 26.822360] ffffffff8142f6c1 0000000041b58ab3 ffffffff8418b1f0 ffffffff8142f505 [ 26.830323] Call Trace: [ 26.832881] [] dump_stack+0xc1/0x128 [ 26.838212] [] ? skb_warn_bad_offload+0x2af/0x390 [ 26.844673] [] panic+0x1bc/0x3a8 [ 26.849658] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 26.857855] [] ? vprintk_emit+0x3ad/0x750 [ 26.863624] [] ? __warn+0x1a9/0x1e0 [ 26.868869] [] ? skb_warn_bad_offload+0x2af/0x390 [ 26.875330] [] __warn+0x1c4/0x1e0 [ 26.880404] [] warn_slowpath_fmt+0xc4/0x110 [ 26.886342] [] ? __warn+0x1e0/0x1e0 [ 26.891586] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 26.898482] [] ? ___ratelimit+0x53/0x460 [ 26.904161] [] skb_warn_bad_offload+0x2af/0x390 [ 26.910447] [] __skb_gso_segment+0x52b/0x670 [ 26.916475] [] validate_xmit_skb+0x44e/0x980 [ 26.922500] [] validate_xmit_skb_list+0xb7/0x120 [ 26.928874] [] sch_direct_xmit+0x34a/0x5d0 [ 26.934726] [] ? dev_deactivate_queue.constprop.28+0x150/0x150 [ 26.942312] [] ? dev_queue_xmit+0x17/0x20 [ 26.948078] [] __dev_queue_xmit+0x17b2/0x20a0 [ 26.954189] [] ? dev_queue_xmit+0x17/0x20 [ 26.959953] [] ? netdev_pick_tx+0x300/0x300 [ 26.965892] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 26.972788] [] ? rcu_read_unlock_special+0x5b7/0x990 [ 26.979508] [] ? tun_select_queue+0x30a/0x480 [ 26.985617] [] ? tun_select_queue+0x331/0x480 [ 26.991728] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 26.997924] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 27.004124] [] dev_queue_xmit+0x17/0x20 [ 27.009716] [] packet_sendmsg+0x2ccc/0x4760 [ 27.015655] [] ? avc_has_perm+0x2fd/0x4f0 [ 27.021420] [] ? avc_has_perm+0xb0/0x4f0 [ 27.027108] [] ? avc_has_perm_noaudit+0x450/0x450 [ 27.033571] [] ? check_preemption_disabled+0x11/0x200 [ 27.040379] [] ? packet_cached_dev_get+0x200/0x200 [ 27.046923] [] ? sock_has_perm+0x292/0x3e0 [ 27.052772] [] ? sock_has_perm+0x9f/0x3e0 [ 27.058537] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 27.065606] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 27.072066] [] ? security_socket_sendmsg+0x89/0xb0 [ 27.078611] [] ? packet_cached_dev_get+0x200/0x200 [ 27.085161] [] sock_sendmsg+0xca/0x110 [ 27.090665] [] SYSC_sendto+0x2c8/0x340 [ 27.096169] [] ? SYSC_connect+0x310/0x310 [ 27.101931] [] ? sock_has_perm+0x292/0x3e0 [ 27.107781] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 27.114848] [] ? selinux_netlbl_socket_setsockopt+0x116/0x340 [ 27.122348] [] ? selinux_netlbl_sock_rcv_skb+0x470/0x470 [ 27.129415] [] ? compat_packet_setsockopt+0xe8/0x140 [ 27.136133] [] ? fput+0xd2/0x140 [ 27.141117] [] ? compat_SyS_setsockopt+0x18a/0x290 [ 27.147661] [] ? packet_setsockopt+0x2340/0x2340 [ 27.154033] [] ? scm_detach_fds_compat+0x3c0/0x3c0 [ 27.160580] [] SyS_sendto+0x40/0x50 [ 27.165825] [] ? SyS_getpeername+0x30/0x30 [ 27.171677] [] do_fast_syscall_32+0x2f7/0x870 [ 27.177790] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.184447] [] entry_SYSENTER_compat+0x74/0x83 [ 27.191066] Dumping ftrace buffer: [ 27.194604] (ftrace buffer empty) [ 27.198284] Kernel Offset: disabled [ 27.201888] Rebooting in 86400 seconds..