[....] Starting enhanced syslogd: rsyslogd[ 11.019373] audit: type=1400 audit(1515764479.829:4): avc: denied { syslog } for pid=3175 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.8' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.743659] device syz0 entered promiscuous mode [ 19.787082] ------------[ cut here ]------------ [ 19.791875] WARNING: CPU: 1 PID: 3324 at net/core/dev.c:2466 skb_warn_bad_offload+0x2af/0x390 [ 19.800548] syz0: caps=(0x00000400000058c1, 0x0000000000000000) len=28 data_len=0 gso_size=8 gso_type=5 ip_summed=0 [ 19.812760] Kernel panic - not syncing: panic_on_warn set ... [ 19.812760] [ 19.822699] CPU: 1 PID: 3324 Comm: syzkaller302466 Not tainted 4.9.76-g9154940 #20 [ 19.831238] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.840566] ffff8801c8a47308 ffffffff81d93149 ffffffff83a47180 ffff8801c8a473e0 [ 19.848513] ffffffff83ee1e00 ffffffff82f3331f 0000000000000009 ffff8801c8a473d0 [ 19.857643] ffffffff8142e371 0000000041b58ab3 ffffffff84189678 ffffffff8142e1b5 [ 19.865601] Call Trace: [ 19.868172] [] dump_stack+0xc1/0x128 [ 19.873517] [] ? skb_warn_bad_offload+0x2af/0x390 [ 19.879991] [] panic+0x1bc/0x3a8 [ 19.884989] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 19.893184] [] ? vprintk_emit+0x3ad/0x750 [ 19.898954] [] ? __warn+0x1a9/0x1e0 [ 19.904196] [] ? skb_warn_bad_offload+0x2af/0x390 [ 19.910651] [] __warn+0x1c4/0x1e0 [ 19.915723] [] warn_slowpath_fmt+0xc4/0x110 [ 19.921665] [] ? __warn+0x1e0/0x1e0 [ 19.926911] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 19.933802] [] ? ___ratelimit+0x53/0x460 [ 19.939479] [] skb_warn_bad_offload+0x2af/0x390 [ 19.945761] [] __skb_gso_segment+0x52b/0x670 [ 19.952043] [] validate_xmit_skb+0x44e/0x980 [ 19.958068] [] validate_xmit_skb_list+0xb7/0x120 [ 19.964437] [] sch_direct_xmit+0x34a/0x5d0 [ 19.970306] [] ? dev_deactivate_queue.constprop.28+0x150/0x150 [ 19.977925] [] ? dev_queue_xmit+0x17/0x20 [ 19.983707] [] __dev_queue_xmit+0x15fd/0x1e60 [ 19.989820] [] ? dev_queue_xmit+0x17/0x20 [ 19.995587] [] ? 0xffffffff810002b8 [ 20.000829] [] ? netdev_pick_tx+0x300/0x300 [ 20.006778] [] ? check_preemption_disabled+0x3b/0x200 [ 20.013598] [] ? tun_select_queue+0x30a/0x480 [ 20.019724] [] ? tun_select_queue+0x331/0x480 [ 20.025847] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 20.032063] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 20.038278] [] dev_queue_xmit+0x17/0x20 [ 20.043956] [] packet_sendmsg+0x2ccc/0x4760 [ 20.049904] [] ? avc_has_perm+0x2fd/0x4f0 [ 20.055667] [] ? avc_has_perm+0xb0/0x4f0 [ 20.062738] [] ? avc_has_perm_noaudit+0x450/0x450 [ 20.069896] [] ? assoc_array_gc+0x12c1/0x1300 [ 20.076012] [] ? packet_cached_dev_get+0x200/0x200 [ 20.082561] [] ? sock_has_perm+0x292/0x3e0 [ 20.088417] [] ? sock_has_perm+0x9f/0x3e0 [ 20.094180] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 20.101245] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 20.107708] [] ? security_socket_sendmsg+0x89/0xb0 [ 20.114256] [] ? packet_cached_dev_get+0x200/0x200 [ 20.121240] [] sock_sendmsg+0xca/0x110 [ 20.126743] [] sock_write_iter+0x226/0x3b0 [ 20.132602] [] ? avc_has_perm_noaudit+0x450/0x450 [ 20.139063] [] ? sock_sendmsg+0x110/0x110 [ 20.144826] [] ? iov_iter_init+0xaf/0x1d0 [ 20.150591] [] __vfs_write+0x4bf/0x680 [ 20.156377] [] ? do_iter_readv_writev+0x400/0x400 [ 20.162834] [] ? selinux_file_permission+0x82/0x460 [ 20.169471] [] ? rw_verify_area+0xe5/0x2b0 [ 20.175674] [] vfs_write+0x189/0x530 [ 20.181022] [] SyS_write+0xd9/0x1b0 [ 20.186271] [] ? SyS_read+0x1b0/0x1b0 [ 20.191691] [] ? do_fast_syscall_32+0xcf/0x890 [ 20.197888] [] ? SyS_read+0x1b0/0x1b0 [ 20.203301] [] do_fast_syscall_32+0x2f7/0x890 [ 20.209413] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.216044] [] entry_SYSENTER_compat+0x74/0x83 [ 20.222369] Dumping ftrace buffer: [ 20.225914] (ftrace buffer empty) [ 20.229602] Kernel Offset: disabled [ 20.233204] Rebooting in 86400 seconds..