[....] Starting enhanced syslogd: rsyslogd[ 13.950117] audit: type=1400 audit(1515518353.338:4): avc: denied { syslog } for pid=3172 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 '10.128.15.244' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 24.673950] device syz0 entered promiscuous mode [ 24.730093] ------------[ cut here ]------------ [ 24.734871] WARNING: CPU: 0 PID: 3327 at net/core/dev.c:2466 skb_warn_bad_offload+0x2af/0x390 [ 24.744571] syz0: caps=(0x00000400000058c1, 0x0000000000000000) len=28 data_len=0 gso_size=63464 gso_type=13 ip_summed=0 [ 24.755573] Kernel panic - not syncing: panic_on_warn set ... [ 24.755573] [ 24.762905] CPU: 0 PID: 3327 Comm: syzkaller037998 Not tainted 4.9.75-g8910fa5 #19 [ 24.770587] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.779909] ffff8801c84c7308 ffffffff81d93049 ffffffff83a47180 ffff8801c84c73e0 [ 24.787856] ffffffff83ee1e00 ffffffff82f3331f 0000000000000009 ffff8801c84c73d0 [ 24.795802] ffffffff8142e281 0000000041b58ab3 ffffffff84189648 ffffffff8142e0c5 [ 24.803781] Call Trace: [ 24.806336] [] dump_stack+0xc1/0x128 [ 24.811667] [] ? skb_warn_bad_offload+0x2af/0x390 [ 24.818125] [] panic+0x1bc/0x3a8 [ 24.823116] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 24.831314] [] ? vprintk_emit+0x3ad/0x750 [ 24.837076] [] ? __warn+0x1a9/0x1e0 [ 24.842327] [] ? skb_warn_bad_offload+0x2af/0x390 [ 24.848786] [] __warn+0x1c4/0x1e0 [ 24.853852] [] warn_slowpath_fmt+0xc4/0x110 [ 24.859794] [] ? __warn+0x1e0/0x1e0 [ 24.865038] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 24.871930] [] ? ___ratelimit+0x53/0x460 [ 24.877615] [] skb_warn_bad_offload+0x2af/0x390 [ 24.883896] [] __skb_gso_segment+0x52b/0x670 [ 24.889918] [] validate_xmit_skb+0x44e/0x980 [ 24.895951] [] validate_xmit_skb_list+0xb7/0x120 [ 24.902331] [] sch_direct_xmit+0x34a/0x5d0 [ 24.908186] [] ? dev_deactivate_queue.constprop.28+0x150/0x150 [ 24.915770] [] ? dev_queue_xmit+0x17/0x20 [ 24.921536] [] __dev_queue_xmit+0x15fd/0x1e60 [ 24.927649] [] ? dev_queue_xmit+0x17/0x20 [ 24.933412] [] ? 0xffffffff810002b8 [ 24.938652] [] ? netdev_pick_tx+0x300/0x300 [ 24.944591] [] ? check_preemption_disabled+0x3b/0x200 [ 24.951398] [] ? tun_select_queue+0x30a/0x480 [ 24.957508] [] ? tun_select_queue+0x331/0x480 [ 24.963623] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 24.969817] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 24.976022] [] dev_queue_xmit+0x17/0x20 [ 24.981621] [] packet_sendmsg+0x2ccc/0x4760 [ 24.987564] [] ? avc_has_perm+0x2fd/0x4f0 [ 24.993327] [] ? avc_has_perm+0xb0/0x4f0 [ 24.999003] [] ? avc_has_perm_noaudit+0x450/0x450 [ 25.005463] [] ? assoc_array_gc+0x12c1/0x1300 [ 25.011572] [] ? packet_cached_dev_get+0x200/0x200 [ 25.018115] [] ? sock_has_perm+0x292/0x3e0 [ 25.023964] [] ? sock_has_perm+0x9f/0x3e0 [ 25.029725] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 25.036798] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 25.043256] [] ? security_socket_sendmsg+0x89/0xb0 [ 25.049811] [] ? packet_cached_dev_get+0x200/0x200 [ 25.056358] [] sock_sendmsg+0xca/0x110 [ 25.061861] [] sock_write_iter+0x226/0x3b0 [ 25.067712] [] ? avc_has_perm_noaudit+0x450/0x450 [ 25.074169] [] ? sock_sendmsg+0x110/0x110 [ 25.079933] [] ? iov_iter_init+0xaf/0x1d0 [ 25.085706] [] __vfs_write+0x4bf/0x680 [ 25.091210] [] ? do_iter_readv_writev+0x400/0x400 [ 25.097674] [] ? selinux_file_permission+0x82/0x460 [ 25.104317] [] ? rw_verify_area+0xe5/0x2b0 [ 25.110164] [] vfs_write+0x189/0x530 [ 25.115493] [] SyS_write+0xd9/0x1b0 [ 25.120734] [] ? SyS_read+0x1b0/0x1b0 [ 25.126152] [] ? do_fast_syscall_32+0xcf/0x890 [ 25.132349] [] ? SyS_read+0x1b0/0x1b0 [ 25.137763] [] do_fast_syscall_32+0x2f7/0x890 [ 25.143874] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.150505] [] entry_SYSENTER_compat+0x74/0x83 [ 25.157199] Dumping ftrace buffer: [ 25.160737] (ftrace buffer empty) [ 25.164420] Kernel Offset: disabled [ 25.168022] Rebooting in 86400 seconds..