[....] Starting enhanced syslogd: rsyslogd[ 11.053139] audit: type=1400 audit(1514916243.769:4): avc: denied { syslog } for pid=3173 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 '10.128.15.218' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 22.679860] ------------[ cut here ]------------ [ 22.680591] WARNING: CPU: 1 PID: 3329 at net/core/dev.c:2466 skb_warn_bad_offload+0x2af/0x390 [ 22.681746] lo: caps=(0x000000a2803b7c69, 0x0000000000000000) len=2105 data_len=2043 gso_size=1992 gso_type=2 ip_summed=0 [ 22.683277] Kernel panic - not syncing: panic_on_warn set ... [ 22.683277] [ 22.684294] CPU: 1 PID: 3329 Comm: syzkaller205672 Not tainted 4.9.73-gf3f3457 #11 [ 22.685340] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.686611] ffff8801c8766e68 ffffffff81d922b9 ffffffff83a46d00 ffff8801c8766f40 [ 22.687737] ffffffff83ee1900 ffffffff82f3226f 0000000000000009 ffff8801c8766f30 [ 22.688875] ffffffff8142d741 0000000041b58ab3 ffffffff84189000 ffffffff8142d585 [ 22.689999] Call Trace: [ 22.690358] [] dump_stack+0xc1/0x128 [ 22.691078] [] ? skb_warn_bad_offload+0x2af/0x390 [ 22.691946] [] panic+0x1bc/0x3a8 [ 22.692610] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 22.693685] [] ? vprintk_emit+0x3ad/0x750 [ 22.694448] [] ? __warn+0x1a9/0x1e0 [ 22.695186] [] ? skb_warn_bad_offload+0x2af/0x390 [ 22.696057] [] __warn+0x1c4/0x1e0 [ 22.696730] [] warn_slowpath_fmt+0xc4/0x110 [ 22.697514] [] ? __warn+0x1e0/0x1e0 [ 22.698211] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 22.699119] [] ? ___ratelimit+0x53/0x460 [ 22.699873] [] skb_warn_bad_offload+0x2af/0x390 [ 22.705726] [] __skb_gso_segment+0x52b/0x670 [ 22.711760] [] validate_xmit_skb+0x44e/0x980 [ 22.717804] [] ? check_preemption_disabled+0x3b/0x200 [ 22.724613] [] ? check_preemption_disabled+0x3b/0x200 [ 22.731424] [] __dev_queue_xmit+0xa17/0x1e60 [ 22.737457] [] ? __dev_queue_xmit+0x1d4/0x1e60 [ 22.743665] [] ? netdev_pick_tx+0x300/0x300 [ 22.749613] [] ? memcpy+0x45/0x50 [ 22.754687] [] dev_queue_xmit+0x17/0x20 [ 22.760281] [] neigh_resolve_output+0x469/0x770 [ 22.766571] [] ? ip6_finish_output2+0x930/0x1d20 [ 22.772944] [] ? eth_mac_addr+0x1a0/0x1a0 [ 22.778716] [] ip6_finish_output2+0x930/0x1d20 [ 22.784915] [] ? ip6_finish_output2+0x175/0x1d20 [ 22.791287] [] ? ip6_sk_dst_lookup_flow+0x590/0x590 [ 22.797922] [] ? check_preemption_disabled+0x3b/0x200 [ 22.804745] [] ? ip6_mtu+0x209/0x340 [ 22.810094] [] ip6_finish_output+0x2e6/0x750 [ 22.816128] [] ip6_output+0x1f3/0x6a0 [ 22.821549] [] ? ip6_output+0x40c/0x6a0 [ 22.827142] [] ? ip6_finish_output+0x750/0x750 [ 22.833339] [] ? ip6_fragment+0x3390/0x3390 [ 22.839278] [] ip6_local_out+0x95/0x170 [ 22.844871] [] ? ip_reply_glue_bits+0xb0/0xb0 [ 22.850991] [] ip6_send_skb+0xa1/0x340 [ 22.856495] [] udp_v6_send_skb+0x301/0xeb0 [ 22.862345] [] udp_v6_push_pending_frames+0x22f/0x340 [ 22.869150] [] ? udpv6_destroy_sock+0xd0/0xd0 [ 22.875261] [] ? ip_reply_glue_bits+0xb0/0xb0 [ 22.881375] [] udpv6_sendmsg+0x1f38/0x2540 [ 22.887233] [] ? ip_reply_glue_bits+0xb0/0xb0 [ 22.893357] [] ? udp_v6_rehash+0xa0/0xa0 [ 22.899040] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 22.906024] [] ? sock_has_perm+0x1c2/0x3e0 [ 22.911876] [] ? sock_has_perm+0x292/0x3e0 [ 22.917815] [] ? sock_has_perm+0x9f/0x3e0 [ 22.923580] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 22.930649] [] ? compat_import_iovec+0x219/0x3c0 [ 22.937026] [] ? check_preemption_disabled+0x3b/0x200 [ 22.943854] [] ? inet_sendmsg+0x201/0x4c0 [ 22.949622] [] inet_sendmsg+0x2bc/0x4c0 [ 22.955213] [] ? inet_sendmsg+0x73/0x4c0 [ 22.960889] [] ? inet_recvmsg+0x4c0/0x4c0 [ 22.966653] [] sock_sendmsg+0xca/0x110 [ 22.972157] [] ___sys_sendmsg+0x6d1/0x7e0 [ 22.977944] [] ? copy_msghdr_from_user+0x550/0x550 [ 22.984489] [] ? __lock_is_held+0xa1/0xf0 [ 22.990253] [] ? _raw_spin_unlock+0x2c/0x50 [ 22.996224] [] ? handle_mm_fault+0x6ee/0x2530 [ 23.002336] [] ? __fget_light+0x158/0x1e0 [ 23.008097] [] ? __fdget+0x18/0x20 [ 23.013253] [] ? sockfd_lookup_light+0x118/0x160 [ 23.019623] [] __sys_sendmsg+0xd6/0x190 [ 23.025219] [] ? SyS_shutdown+0x1b0/0x1b0 [ 23.030994] [] ? __do_page_fault+0x5ec/0xd40 [ 23.037028] [] compat_SyS_sendmsg+0x2a/0x40 [ 23.042966] [] ? compat_SyS_getsockopt+0x2a0/0x2a0 [ 23.049512] [] do_fast_syscall_32+0x2f7/0x890 [ 23.055629] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 23.062261] [] entry_SYSENTER_compat+0x51/0x60 [ 23.068592] Dumping ftrace buffer: [ 23.072137] (ftrace buffer empty) [ 23.075821] Kernel Offset: disabled [ 23.079426] Rebooting in 86400 seconds..