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-next-kasan-gce-7,10.128.15.219' (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: [ 22.390911] syz0: caps=(0x00000400000058c1, 0x0000000000000000) len=159 data_len=0 gso_size=1792 gso_type=3 ip_summed=0 [ 22.401973] ------------[ cut here ]------------ [ 22.406929] WARNING: CPU: 1 PID: 2980 at net/core/dev.c:2585 skb_warn_bad_offload+0x2a9/0x380 [ 22.415616] Kernel panic - not syncing: panic_on_warn set ... [ 22.415616] [ 22.422962] CPU: 1 PID: 2980 Comm: syzkaller646248 Not tainted 4.13.0-next-20170912+ #20 [ 22.431162] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.440490] Call Trace: [ 22.443052] dump_stack+0x194/0x257 [ 22.446656] ? arch_local_irq_restore+0x53/0x53 [ 22.451323] panic+0x1e4/0x417 [ 22.454491] ? __warn+0x1d9/0x1d9 [ 22.457928] ? show_regs_print_info+0x65/0x65 [ 22.462414] ? skb_warn_bad_offload+0x2a9/0x380 [ 22.467066] __warn+0x1c4/0x1d9 [ 22.470324] ? skb_warn_bad_offload+0x2a9/0x380 [ 22.474967] report_bug+0x211/0x2d0 [ 22.478576] fixup_bug+0x40/0x90 [ 22.481916] do_trap+0x260/0x390 [ 22.485262] do_error_trap+0x120/0x390 [ 22.489124] ? do_trap+0x390/0x390 [ 22.492637] ? skb_warn_bad_offload+0x2a9/0x380 [ 22.497287] ? vprintk_emit+0x3ea/0x590 [ 22.501253] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 22.506077] do_invalid_op+0x1b/0x20 [ 22.509764] invalid_op+0x18/0x20 [ 22.513190] RIP: 0010:skb_warn_bad_offload+0x2a9/0x380 [ 22.518438] RSP: 0018:ffff8801ce5ff0a0 EFLAGS: 00010282 [ 22.523790] RAX: 000000000000006b RBX: ffff8801ce03cd60 RCX: 0000000000000000 [ 22.531040] RDX: 000000000000006b RSI: 1ffff10039cbfdd4 RDI: ffffed0039cbfe08 [ 22.538294] RBP: ffff8801ce5ff0f8 R08: ffff8801ce5fe790 R09: 0000000000000000 [ 22.545538] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ceb982c0 [ 22.552787] R13: 0000000000000000 R14: ffff8801ceb982c0 R15: 0000000000000700 [ 22.560068] __skb_gso_segment+0x607/0x7f0 [ 22.564281] ? skb_mac_gso_segment+0x660/0x660 [ 22.568846] validate_xmit_skb+0x4ba/0xb20 [ 22.573057] ? netif_skb_features+0x8e0/0x8e0 [ 22.577548] validate_xmit_skb_list+0xb7/0x120 [ 22.582109] sch_direct_xmit+0x3b6/0x6d0 [ 22.586146] ? dev_deactivate_queue.constprop.27+0x260/0x260 [ 22.591927] __dev_queue_xmit+0x15fe/0x1e40 [ 22.596220] ? __might_fault+0xe0/0x1d0 [ 22.600184] ? netdev_pick_tx+0x300/0x300 [ 22.604305] ? skb_set_owner_w+0x1ff/0x300 [ 22.608522] ? __might_sleep+0x95/0x190 [ 22.612468] ? kasan_check_write+0x14/0x20 [ 22.616673] ? copyin+0x91/0xb0 [ 22.619925] ? _copy_from_iter+0x367/0xf30 [ 22.624132] ? __check_object_size+0x25d/0x4f0 [ 22.628703] ? check_stack_object+0x140/0x140 [ 22.633174] ? copy_page_to_iter+0xd60/0xd60 [ 22.637558] ? _copy_from_iter_full+0x22b/0xbb0 [ 22.642198] ? __dev_get_by_index+0x1a0/0x1a0 [ 22.646680] ? skb_copy_datagram_from_iter+0x3a5/0x5a0 [ 22.651937] ? iov_iter_advance+0x13f0/0x13f0 [ 22.656944] ? sock_cmsg_send+0x1e1/0x260 [ 22.661149] dev_queue_xmit+0x17/0x20 [ 22.664943] packet_sendmsg+0x3bbf/0x6030 [ 22.669072] ? do_raw_spin_trylock+0x190/0x190 [ 22.673635] ? find_held_lock+0x39/0x1d0 [ 22.677703] ? packet_cached_dev_get+0x2b0/0x2b0 [ 22.682435] ? check_noncircular+0x20/0x20 [ 22.686646] ? lock_release+0xd70/0xd70 [ 22.690591] ? check_same_owner+0x320/0x320 [ 22.694885] ? __check_object_size+0x25d/0x4f0 [ 22.699448] ? __might_sleep+0x95/0x190 [ 22.703400] ? find_held_lock+0x39/0x1d0 [ 22.707446] ? lock_downgrade+0x990/0x990 [ 22.711576] ? sock_has_perm+0x29c/0x400 [ 22.715617] ? selinux_tun_dev_create+0xc0/0xc0 [ 22.720261] ? prandom_u32_state+0x12f/0x180 [ 22.724645] ? lock_release+0xd70/0xd70 [ 22.728609] ? security_socket_sendmsg+0x89/0xb0 [ 22.733349] ? packet_cached_dev_get+0x2b0/0x2b0 [ 22.738088] sock_sendmsg+0xca/0x110 [ 22.741775] ___sys_sendmsg+0x75b/0x8a0 [ 22.745726] ? copy_msghdr_from_user+0x590/0x590 [ 22.750477] ? fget_raw+0x20/0x20 [ 22.753907] ? handle_mm_fault+0x410/0x8d0 [ 22.758111] ? down_read_trylock+0xdb/0x170 [ 22.762401] ? __do_page_fault+0x2b8/0xb60 [ 22.766619] ? __fdget+0x18/0x20 [ 22.769959] __sys_sendmsg+0xe5/0x210 [ 22.773729] ? __sys_sendmsg+0xe5/0x210 [ 22.777679] ? SyS_shutdown+0x290/0x290 [ 22.781630] ? __do_page_fault+0xb60/0xb60 [ 22.785837] ? SyS_setsockopt+0x189/0x360 [ 22.789956] ? SyS_setsockopt+0x215/0x360 [ 22.794090] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 22.799677] SyS_sendmsg+0x2d/0x50 [ 22.803193] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 22.807918] RIP: 0033:0x445449 [ 22.811078] RSP: 002b:00000000007efe58 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 22.818757] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445449 [ 22.825997] RDX: 0000000020000000 RSI: 0000000020f18000 RDI: 0000000000000004 [ 22.833237] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000 [ 22.840478] R10: 0000000000000004 R11: 0000000000000217 R12: 0000000000402aa0 [ 22.847718] R13: 0000000000402b30 R14: 0000000000000000 R15: 0000000000000000 [ 22.855115] Dumping ftrace buffer: [ 22.858670] (ftrace buffer empty) [ 22.862351] Kernel Offset: disabled [ 22.865955] Rebooting in 86400 seconds..