[....] Starting enhanced syslogd: rsyslogd[ 10.022563] audit: type=1400 audit(1514209947.310:4): avc: denied { syslog } for pid=3178 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 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 'ci-android-49-kasan-gce-0,10.128.0.23' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 36.065912] device syz0 entered promiscuous mode [ 36.101097] ------------[ cut here ]------------ [ 36.105879] WARNING: CPU: 1 PID: 3344 at net/core/dev.c:2466 skb_warn_bad_offload+0x2af/0x390 [ 36.114541] syz0: caps=(0x00000400000058c1, 0x0000000000000000) len=28 data_len=0 gso_size=63464 gso_type=13 ip_summed=0 [ 36.125540] Kernel panic - not syncing: panic_on_warn set ... [ 36.125540] [ 36.132874] CPU: 1 PID: 3344 Comm: syzkaller756763 Not tainted 4.9.71-g2506378 #113 [ 36.140632] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.149959] ffff8801ccea7370 ffffffff81d922b9 ffffffff83a46d00 ffff8801ccea7448 [ 36.157906] ffffffff83ee1900 ffffffff82f3226f 0000000000000009 ffff8801ccea7438 [ 36.165862] ffffffff8142d741 0000000041b58ab3 ffffffff84188580 ffffffff8142d585 [ 36.173809] Call Trace: [ 36.176369] [] dump_stack+0xc1/0x128 [ 36.181705] [] ? skb_warn_bad_offload+0x2af/0x390 [ 36.188165] [] panic+0x1bc/0x3a8 [ 36.193148] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 36.201342] [] ? vprintk_emit+0x3ad/0x750 [ 36.207105] [] ? __warn+0x1a9/0x1e0 [ 36.212350] [] ? skb_warn_bad_offload+0x2af/0x390 [ 36.218805] [] __warn+0x1c4/0x1e0 [ 36.223882] [] warn_slowpath_fmt+0xc4/0x110 [ 36.229816] [] ? __warn+0x1e0/0x1e0 [ 36.235067] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 36.241958] [] ? ___ratelimit+0x53/0x460 [ 36.247634] [] skb_warn_bad_offload+0x2af/0x390 [ 36.253930] [] __skb_gso_segment+0x52b/0x670 [ 36.259954] [] validate_xmit_skb+0x44e/0x980 [ 36.265981] [] validate_xmit_skb_list+0xb7/0x120 [ 36.272354] [] sch_direct_xmit+0x34a/0x5d0 [ 36.278211] [] ? dev_deactivate_queue.constprop.28+0x150/0x150 [ 36.285796] [] ? dev_queue_xmit+0x17/0x20 [ 36.291556] [] __dev_queue_xmit+0x15fd/0x1e60 [ 36.297664] [] ? dev_queue_xmit+0x17/0x20 [ 36.303427] [] ? 0xffffffff810002b8 [ 36.308666] [] ? netdev_pick_tx+0x300/0x300 [ 36.314605] [] ? check_preemption_disabled+0x3b/0x200 [ 36.321411] [] ? tun_select_queue+0x30a/0x480 [ 36.327529] [] ? tun_select_queue+0x331/0x480 [ 36.333645] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 36.339849] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 36.346046] [] dev_queue_xmit+0x17/0x20 [ 36.351639] [] packet_sendmsg+0x2ccc/0x4760 [ 36.357586] [] ? avc_has_perm+0x2fd/0x4f0 [ 36.363352] [] ? avc_has_perm+0xb0/0x4f0 [ 36.369028] [] ? avc_has_perm_noaudit+0x450/0x450 [ 36.375488] [] ? assoc_array_gc+0x1241/0x1300 [ 36.381608] [] ? packet_cached_dev_get+0x200/0x200 [ 36.388151] [] ? sock_has_perm+0x292/0x3e0 [ 36.394003] [] ? sock_has_perm+0x9f/0x3e0 [ 36.399765] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 36.406828] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 36.413286] [] ? security_socket_sendmsg+0x89/0xb0 [ 36.419840] [] ? packet_cached_dev_get+0x200/0x200 [ 36.426385] [] sock_sendmsg+0xca/0x110 [ 36.431886] [] sock_write_iter+0x226/0x3b0 [ 36.437734] [] ? avc_has_perm_noaudit+0x450/0x450 [ 36.444205] [] ? sock_sendmsg+0x110/0x110 [ 36.449980] [] ? iov_iter_init+0xaf/0x1d0 [ 36.455750] [] __vfs_write+0x4bf/0x680 [ 36.461260] [] ? do_iter_readv_writev+0x400/0x400 [ 36.467724] [] ? selinux_file_permission+0x82/0x460 [ 36.474355] [] ? rw_verify_area+0xe5/0x2b0 [ 36.480204] [] vfs_write+0x189/0x530 [ 36.485533] [] SyS_write+0xd9/0x1b0 [ 36.490785] [] ? SyS_read+0x1b0/0x1b0 [ 36.496202] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 36.503009] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 36.509558] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 36.516610] Dumping ftrace buffer: [ 36.520139] (ftrace buffer empty) [ 36.523812] Kernel Offset: disabled [ 36.527414] Rebooting in 86400 seconds..