[....] Starting enhanced syslogd: rsyslogd[ 12.043484] audit: type=1400 audit(1514694496.293:4): avc: denied { syslog } for pid=3168 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] 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 '10.128.0.7' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.835275] device syz0 entered promiscuous mode [ 26.890474] ------------[ cut here ]------------ [ 26.895242] WARNING: CPU: 1 PID: 3331 at net/core/dev.c:2466 skb_warn_bad_offload+0x2af/0x390 [ 26.903892] syz0: caps=(0x00000400000058c1, 0x0000000000000000) len=28 data_len=0 gso_size=8 gso_type=5 ip_summed=0 [ 26.914435] Kernel panic - not syncing: panic_on_warn set ... [ 26.914435] [ 26.921768] CPU: 1 PID: 3331 Comm: syzkaller332456 Not tainted 4.9.73-gf3f3457 #1 [ 26.929823] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.939145] ffff8801c943f370 ffffffff81d922b9 ffffffff83a46d00 ffff8801c943f448 [ 26.947104] ffffffff83ee1900 ffffffff82f3226f 0000000000000009 ffff8801c943f438 [ 26.955044] ffffffff8142d741 0000000041b58ab3 ffffffff84189000 ffffffff8142d585 [ 26.962991] Call Trace: [ 26.965547] [] dump_stack+0xc1/0x128 [ 26.970877] [] ? skb_warn_bad_offload+0x2af/0x390 [ 26.977334] [] panic+0x1bc/0x3a8 [ 26.982327] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 26.990518] [] ? vprintk_emit+0x3ad/0x750 [ 26.996278] [] ? __warn+0x1a9/0x1e0 [ 27.001516] [] ? skb_warn_bad_offload+0x2af/0x390 [ 27.007978] [] __warn+0x1c4/0x1e0 [ 27.013045] [] warn_slowpath_fmt+0xc4/0x110 [ 27.018981] [] ? __warn+0x1e0/0x1e0 [ 27.024225] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 27.031120] [] ? ___ratelimit+0x53/0x460 [ 27.036795] [] skb_warn_bad_offload+0x2af/0x390 [ 27.043074] [] __skb_gso_segment+0x52b/0x670 [ 27.049092] [] validate_xmit_skb+0x44e/0x980 [ 27.055111] [] validate_xmit_skb_list+0xb7/0x120 [ 27.061480] [] sch_direct_xmit+0x34a/0x5d0 [ 27.067327] [] ? dev_deactivate_queue.constprop.28+0x150/0x150 [ 27.074914] [] ? dev_queue_xmit+0x17/0x20 [ 27.080684] [] __dev_queue_xmit+0x15fd/0x1e60 [ 27.086792] [] ? dev_queue_xmit+0x17/0x20 [ 27.092551] [] ? 0xffffffff810002b8 [ 27.097791] [] ? netdev_pick_tx+0x300/0x300 [ 27.103728] [] ? check_preemption_disabled+0x3b/0x200 [ 27.110529] [] ? tun_select_queue+0x30a/0x480 [ 27.116640] [] ? tun_select_queue+0x331/0x480 [ 27.122746] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 27.128941] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 27.135142] [] dev_queue_xmit+0x17/0x20 [ 27.140729] [] packet_sendmsg+0x2ccc/0x4760 [ 27.146664] [] ? avc_has_perm+0x2fd/0x4f0 [ 27.152422] [] ? avc_has_perm+0xb0/0x4f0 [ 27.158094] [] ? avc_has_perm_noaudit+0x450/0x450 [ 27.164549] [] ? assoc_array_gc+0x1241/0x1300 [ 27.170660] [] ? packet_cached_dev_get+0x200/0x200 [ 27.177203] [] ? sock_has_perm+0x292/0x3e0 [ 27.183052] [] ? sock_has_perm+0x9f/0x3e0 [ 27.188815] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 27.195885] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 27.202339] [] ? security_socket_sendmsg+0x89/0xb0 [ 27.208884] [] ? packet_cached_dev_get+0x200/0x200 [ 27.215427] [] sock_sendmsg+0xca/0x110 [ 27.220926] [] sock_write_iter+0x226/0x3b0 [ 27.226774] [] ? avc_has_perm_noaudit+0x450/0x450 [ 27.233230] [] ? sock_sendmsg+0x110/0x110 [ 27.238992] [] ? iov_iter_init+0xaf/0x1d0 [ 27.244758] [] __vfs_write+0x4bf/0x680 [ 27.250256] [] ? do_iter_readv_writev+0x400/0x400 [ 27.256712] [] ? selinux_file_permission+0x82/0x460 [ 27.263342] [] ? rw_verify_area+0xe5/0x2b0 [ 27.269190] [] vfs_write+0x189/0x530 [ 27.274518] [] SyS_write+0xd9/0x1b0 [ 27.279760] [] ? SyS_read+0x1b0/0x1b0 [ 27.285184] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.291986] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.298534] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 27.305534] Dumping ftrace buffer: [ 27.309071] (ftrace buffer empty) [ 27.312756] Kernel Offset: disabled [ 27.316355] Rebooting in 86400 seconds..