[....] Starting enhanced syslogd: rsyslogd[ 9.666048] audit: type=1400 audit(1513653800.945:4): avc: denied { syslog } for pid=3163 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 'ci-android-49-kasan-gce-8,10.128.15.232' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 21.168566] device syz0 entered promiscuous mode [ 21.220897] ------------[ cut here ]------------ [ 21.225679] WARNING: CPU: 0 PID: 3321 at net/core/dev.c:2465 skb_warn_bad_offload+0x2af/0x390 [ 21.234324] syz0: caps=(0x00000400000058c1, 0x0000000000000000) len=56 data_len=0 gso_size=3 gso_type=36 ip_summed=0 [ 21.244953] Kernel panic - not syncing: panic_on_warn set ... [ 21.244953] [ 21.252289] CPU: 0 PID: 3321 Comm: syzkaller706056 Not tainted 4.9.70-g9542d2a #109 [ 21.260046] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.269363] ffff8801cab27370 ffffffff81d90a29 ffffffff83a46d00 ffff8801cab27448 [ 21.277315] ffffffff83ee0d00 ffffffff82f2d24f 0000000000000009 ffff8801cab27438 [ 21.285261] ffffffff8142c451 0000000041b58ab3 ffffffff84186f20 ffffffff8142c295 [ 21.293214] Call Trace: [ 21.295768] [] dump_stack+0xc1/0x128 [ 21.301100] [] ? skb_warn_bad_offload+0x2af/0x390 [ 21.307555] [] panic+0x1bc/0x3a8 [ 21.312538] [] ? percpu_up_read_preempt_enable.constprop.54+0xd7/0xd7 [ 21.320732] [] ? vprintk_emit+0x3ad/0x750 [ 21.326493] [] ? skb_warn_bad_offload+0x2af/0x390 [ 21.332948] [] __warn+0x1c4/0x1e0 [ 21.338015] [] warn_slowpath_fmt+0xc4/0x110 [ 21.343951] [] ? __warn+0x1e0/0x1e0 [ 21.349193] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 21.356085] [] ? ___ratelimit+0x53/0x460 [ 21.361761] [] skb_warn_bad_offload+0x2af/0x390 [ 21.368043] [] __skb_gso_segment+0x52b/0x670 [ 21.374064] [] validate_xmit_skb+0x44e/0x980 [ 21.380086] [] validate_xmit_skb_list+0xb7/0x120 [ 21.386459] [] sch_direct_xmit+0x34a/0x5d0 [ 21.392307] [] ? dev_deactivate_queue.constprop.28+0x150/0x150 [ 21.399891] [] ? dev_queue_xmit+0x17/0x20 [ 21.405659] [] __dev_queue_xmit+0x15fd/0x1e60 [ 21.411786] [] ? dev_queue_xmit+0x17/0x20 [ 21.417547] [] ? 0xffffffff810002b8 [ 21.422788] [] ? netdev_pick_tx+0x300/0x300 [ 21.428724] [] ? check_preemption_disabled+0x3b/0x200 [ 21.435536] [] ? tun_select_queue+0x30a/0x480 [ 21.441648] [] ? tun_select_queue+0x331/0x480 [ 21.447769] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 21.453965] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 21.460164] [] dev_queue_xmit+0x17/0x20 [ 21.465754] [] packet_sendmsg+0x2ccc/0x4760 [ 21.471691] [] ? avc_has_perm+0x2fd/0x4f0 [ 21.477452] [] ? avc_has_perm+0xb0/0x4f0 [ 21.483125] [] ? avc_has_perm_noaudit+0x450/0x450 [ 21.489583] [] ? assoc_array_gc+0x12e1/0x1300 [ 21.495694] [] ? packet_cached_dev_get+0x200/0x200 [ 21.502238] [] ? sock_has_perm+0x292/0x3e0 [ 21.508089] [] ? sock_has_perm+0x9f/0x3e0 [ 21.513854] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 21.520919] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 21.527382] [] ? security_socket_sendmsg+0x89/0xb0 [ 21.533926] [] ? packet_cached_dev_get+0x200/0x200 [ 21.540481] [] sock_sendmsg+0xca/0x110 [ 21.545982] [] sock_write_iter+0x226/0x3b0 [ 21.551834] [] ? avc_has_perm_noaudit+0x450/0x450 [ 21.558292] [] ? sock_sendmsg+0x110/0x110 [ 21.564054] [] ? iov_iter_init+0xaf/0x1d0 [ 21.569819] [] __vfs_write+0x4bf/0x680 [ 21.575330] [] ? do_iter_readv_writev+0x400/0x400 [ 21.581786] [] ? selinux_file_permission+0x82/0x460 [ 21.588418] [] ? rw_verify_area+0xe5/0x2b0 [ 21.594267] [] vfs_write+0x189/0x530 [ 21.599593] [] SyS_write+0xd9/0x1b0 [ 21.604836] [] ? SyS_read+0x1b0/0x1b0 [ 21.610252] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 21.617056] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 21.623600] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 21.630286] Dumping ftrace buffer: [ 21.633830] (ftrace buffer empty) [ 21.637506] Kernel Offset: disabled [ 21.641110] Rebooting in 86400 seconds..