[....] Starting enhanced syslogd: rsyslogd[ 12.847415] audit: type=1400 audit(1515221213.445:4): 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.36' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 23.802560] device syz0 entered promiscuous mode [ 23.845023] ------------[ cut here ]------------ [ 23.849807] WARNING: CPU: 1 PID: 3328 at net/core/dev.c:2466 skb_warn_bad_offload+0x2af/0x390 [ 23.858477] syz0: caps=(0x00000400000058c1, 0x0000000000000000) len=56 data_len=0 gso_size=3 gso_type=36 ip_summed=0 [ 23.869126] Kernel panic - not syncing: panic_on_warn set ... [ 23.869126] [ 23.876454] CPU: 1 PID: 3328 Comm: syzkaller582361 Not tainted 4.9.75-gbc7ff9b #15 [ 23.884123] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.893442] ffff8801c8f97308 ffffffff81d93049 ffffffff83a47180 ffff8801c8f973e0 [ 23.901387] ffffffff83ee1e00 ffffffff82f3331f 0000000000000009 ffff8801c8f973d0 [ 23.909344] ffffffff8142e281 0000000041b58ab3 ffffffff84189648 ffffffff8142e0c5 [ 23.917300] Call Trace: [ 23.919855] [] dump_stack+0xc1/0x128 [ 23.925184] [] ? skb_warn_bad_offload+0x2af/0x390 [ 23.931641] [] panic+0x1bc/0x3a8 [ 23.936621] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 23.944814] [] ? vprintk_emit+0x3ad/0x750 [ 23.950581] [] ? __warn+0x1a9/0x1e0 [ 23.955821] [] ? skb_warn_bad_offload+0x2af/0x390 [ 23.962276] [] __warn+0x1c4/0x1e0 [ 23.967344] [] warn_slowpath_fmt+0xc4/0x110 [ 23.973280] [] ? __warn+0x1e0/0x1e0 [ 23.978521] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 23.985413] [] ? ___ratelimit+0x53/0x460 [ 23.991088] [] skb_warn_bad_offload+0x2af/0x390 [ 23.997373] [] __skb_gso_segment+0x52b/0x670 [ 24.003395] [] validate_xmit_skb+0x44e/0x980 [ 24.009414] [] validate_xmit_skb_list+0xb7/0x120 [ 24.015782] [] sch_direct_xmit+0x34a/0x5d0 [ 24.021630] [] ? dev_deactivate_queue.constprop.28+0x150/0x150 [ 24.029213] [] ? dev_queue_xmit+0x17/0x20 [ 24.034974] [] __dev_queue_xmit+0x15fd/0x1e60 [ 24.041082] [] ? dev_queue_xmit+0x17/0x20 [ 24.046844] [] ? 0xffffffff810002b8 [ 24.052086] [] ? netdev_pick_tx+0x300/0x300 [ 24.058022] [] ? check_preemption_disabled+0x3b/0x200 [ 24.064825] [] ? tun_select_queue+0x30a/0x480 [ 24.070941] [] ? tun_select_queue+0x331/0x480 [ 24.077049] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 24.083247] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 24.089441] [] dev_queue_xmit+0x17/0x20 [ 24.095029] [] packet_sendmsg+0x2ccc/0x4760 [ 24.100965] [] ? avc_has_perm+0x2fd/0x4f0 [ 24.106731] [] ? avc_has_perm+0xb0/0x4f0 [ 24.112405] [] ? avc_has_perm_noaudit+0x450/0x450 [ 24.118860] [] ? assoc_array_gc+0x12c1/0x1300 [ 24.124967] [] ? packet_cached_dev_get+0x200/0x200 [ 24.131511] [] ? sock_has_perm+0x292/0x3e0 [ 24.137369] [] ? sock_has_perm+0x9f/0x3e0 [ 24.143130] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 24.150193] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 24.156651] [] ? security_socket_sendmsg+0x89/0xb0 [ 24.163195] [] ? packet_cached_dev_get+0x200/0x200 [ 24.170085] [] sock_sendmsg+0xca/0x110 [ 24.175587] [] sock_write_iter+0x226/0x3b0 [ 24.181433] [] ? avc_has_perm_noaudit+0x450/0x450 [ 24.187895] [] ? sock_sendmsg+0x110/0x110 [ 24.193681] [] ? iov_iter_init+0xaf/0x1d0 [ 24.199443] [] __vfs_write+0x4bf/0x680 [ 24.204944] [] ? do_iter_readv_writev+0x400/0x400 [ 24.211402] [] ? selinux_file_permission+0x82/0x460 [ 24.218032] [] ? rw_verify_area+0xe5/0x2b0 [ 24.223894] [] vfs_write+0x189/0x530 [ 24.229221] [] SyS_write+0xd9/0x1b0 [ 24.234470] [] ? SyS_read+0x1b0/0x1b0 [ 24.239884] [] ? do_fast_syscall_32+0xcf/0x890 [ 24.246079] [] ? SyS_read+0x1b0/0x1b0 [ 24.251491] [] do_fast_syscall_32+0x2f7/0x890 [ 24.257600] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.264231] [] entry_SYSENTER_compat+0x74/0x83 [ 24.270970] Dumping ftrace buffer: [ 24.274513] (ftrace buffer empty) [ 24.278189] Kernel Offset: disabled [ 24.281795] Rebooting in 86400 seconds..