INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-kasan-gce-3,10.128.0.36' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 executing program syzkaller login: [ 37.843513] syz0: caps=(0x00000400000058c1, 0x0000000000000000) len=159 data_len=0 gso_size=1792 gso_type=3 ip_summed=0 [ 37.854551] ------------[ cut here ]------------ [ 37.859422] WARNING: CPU: 0 PID: 2986 at net/core/dev.c:2585 skb_warn_bad_offload+0x2a9/0x380 [ 37.868071] Kernel panic - not syncing: panic_on_warn set ... [ 37.868071] [ 37.875402] CPU: 0 PID: 2986 Comm: syzkaller452680 Not tainted 4.13.0+ #80 [ 37.882380] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.891706] Call Trace: [ 37.894265] dump_stack+0x194/0x257 [ 37.897865] ? arch_local_irq_restore+0x53/0x53 [ 37.902514] panic+0x1e4/0x417 [ 37.905677] ? __warn+0x1d9/0x1d9 [ 37.909098] ? show_regs_print_info+0x65/0x65 [ 37.913576] ? skb_warn_bad_offload+0x2a9/0x380 [ 37.918212] __warn+0x1c4/0x1d9 [ 37.921462] ? skb_warn_bad_offload+0x2a9/0x380 [ 37.926102] report_bug+0x211/0x2d0 [ 37.929707] fixup_bug+0x40/0x90 [ 37.933042] do_trap+0x260/0x390 [ 37.936384] do_error_trap+0x120/0x390 [ 37.940247] ? do_trap+0x390/0x390 [ 37.943759] ? skb_warn_bad_offload+0x2a9/0x380 [ 37.948394] ? vprintk_emit+0x3ea/0x590 [ 37.952347] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 37.957164] do_invalid_op+0x1b/0x20 [ 37.960849] invalid_op+0x18/0x20 [ 37.964272] RIP: 0010:skb_warn_bad_offload+0x2a9/0x380 [ 37.969514] RSP: 0018:ffff8801ce0ef0a0 EFLAGS: 00010282 [ 37.974847] RAX: 000000000000006b RBX: ffff8801cd800c20 RCX: 0000000000000000 [ 37.982085] RDX: 000000000000006b RSI: 1ffff10039c1ddd4 RDI: ffffed0039c1de08 [ 37.989324] RBP: ffff8801ce0ef0f8 R08: ffff8801ce0ee790 R09: 0000000000000000 [ 37.996565] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ce7c8300 [ 38.003805] R13: 0000000000000000 R14: ffff8801ce7c8300 R15: 0000000000000700 [ 38.011076] __skb_gso_segment+0x607/0x7f0 [ 38.015283] ? skb_mac_gso_segment+0x660/0x660 [ 38.019846] validate_xmit_skb+0x4ba/0xb20 [ 38.024054] ? netif_skb_features+0x8e0/0x8e0 [ 38.028529] validate_xmit_skb_list+0xb7/0x120 [ 38.033086] sch_direct_xmit+0x3b6/0x6d0 [ 38.037119] ? dev_deactivate_queue.constprop.27+0x260/0x260 [ 38.042896] __dev_queue_xmit+0x15fe/0x1e40 [ 38.047185] ? __might_fault+0xe0/0x1d0 [ 38.051136] ? netdev_pick_tx+0x300/0x300 [ 38.055262] ? skb_set_owner_w+0x1ff/0x300 [ 38.059474] ? __might_sleep+0x95/0x190 [ 38.063420] ? kasan_check_write+0x14/0x20 [ 38.067626] ? copyin+0x91/0xb0 [ 38.070880] ? _copy_from_iter+0x367/0xf30 [ 38.075087] ? __check_object_size+0x25d/0x4f0 [ 38.079643] ? check_stack_object+0x140/0x140 [ 38.084110] ? copy_page_to_iter+0xd60/0xd60 [ 38.088491] ? _copy_from_iter_full+0x22b/0xbb0 [ 38.093127] ? __dev_get_by_index+0x1a0/0x1a0 [ 38.097602] ? skb_copy_datagram_from_iter+0x3a5/0x5a0 [ 38.102850] ? iov_iter_advance+0x13f0/0x13f0 [ 38.107311] ? sock_cmsg_send+0x1e1/0x260 [ 38.111435] dev_queue_xmit+0x17/0x20 [ 38.115209] packet_sendmsg+0x3bbf/0x6030 [ 38.119327] ? do_raw_spin_trylock+0x190/0x190 [ 38.123883] ? find_held_lock+0x39/0x1d0 [ 38.127936] ? packet_cached_dev_get+0x2b0/0x2b0 [ 38.132660] ? check_noncircular+0x20/0x20 [ 38.136865] ? lock_release+0xd70/0xd70 [ 38.140827] ? check_same_owner+0x320/0x320 [ 38.145121] ? __check_object_size+0x25d/0x4f0 [ 38.149681] ? __might_sleep+0x95/0x190 [ 38.153628] ? find_held_lock+0x39/0x1d0 [ 38.157669] ? lock_downgrade+0x990/0x990 [ 38.161791] ? sock_has_perm+0x29c/0x400 [ 38.165826] ? selinux_tun_dev_create+0xc0/0xc0 [ 38.170464] ? match_u64+0x1f/0x220 [ 38.174063] ? lock_release+0xd70/0xd70 [ 38.178026] ? security_socket_sendmsg+0x89/0xb0 [ 38.182754] ? packet_cached_dev_get+0x2b0/0x2b0 [ 38.187483] sock_sendmsg+0xca/0x110 [ 38.191168] ___sys_sendmsg+0x75b/0x8a0 [ 38.195116] ? copy_msghdr_from_user+0x590/0x590 [ 38.199863] ? fget_raw+0x20/0x20 [ 38.203293] ? handle_mm_fault+0x410/0x8d0 [ 38.207495] ? down_read_trylock+0xdb/0x170 [ 38.211786] ? __do_page_fault+0x2b8/0xb60 [ 38.216000] ? __fdget+0x18/0x20 [ 38.219342] __sys_sendmsg+0xe5/0x210 [ 38.223109] ? __sys_sendmsg+0xe5/0x210 [ 38.227053] ? SyS_shutdown+0x290/0x290 [ 38.230996] ? __do_page_fault+0xb60/0xb60 [ 38.235203] ? SyS_setsockopt+0x189/0x360 [ 38.239328] ? SyS_setsockopt+0x215/0x360 [ 38.243456] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 38.248449] SyS_sendmsg+0x2d/0x50 [ 38.251963] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 38.256689] RIP: 0033:0x445449 [ 38.259847] RSP: 002b:00000000007efe58 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 38.267525] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445449 [ 38.274763] RDX: 0000000020000000 RSI: 0000000020f18000 RDI: 0000000000000004 [ 38.282003] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000 [ 38.289243] R10: 0000000000000004 R11: 0000000000000217 R12: 0000000000402aa0 [ 38.296609] R13: 0000000000402b30 R14: 0000000000000000 R15: 0000000000000000 [ 38.304349] Dumping ftrace buffer: [ 38.307903] (ftrace buffer empty) [ 38.311586] Kernel Offset: disabled [ 38.315191] Rebooting in 86400 seconds..