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-net-kasan-gce-1,10.128.15.219' (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: [ 36.336747] syz0: caps=(0x00000400000058c1, 0x0000000000000000) len=159 data_len=0 gso_size=1792 gso_type=3 ip_summed=0 [ 36.338544] ------------[ cut here ]------------ [ 36.339382] WARNING: CPU: 0 PID: 2984 at net/core/dev.c:2585 skb_warn_bad_offload+0x2a9/0x380 [ 36.340538] Kernel panic - not syncing: panic_on_warn set ... [ 36.340538] [ 36.341555] CPU: 0 PID: 2984 Comm: syzkaller884522 Not tainted 4.13.0+ #43 [ 36.342515] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.343737] Call Trace: [ 36.344100] dump_stack+0x194/0x257 [ 36.344606] ? arch_local_irq_restore+0x53/0x53 [ 36.345267] panic+0x1e4/0x417 [ 36.345704] ? __warn+0x1d9/0x1d9 [ 36.346202] ? show_regs_print_info+0x65/0x65 [ 36.346818] ? skb_warn_bad_offload+0x2a9/0x380 [ 36.347445] __warn+0x1c4/0x1d9 [ 36.347894] ? skb_warn_bad_offload+0x2a9/0x380 [ 36.348523] report_bug+0x211/0x2d0 [ 36.349078] fixup_bug+0x40/0x90 [ 36.349539] do_trap+0x260/0x390 [ 36.350004] do_error_trap+0x120/0x390 [ 36.350533] ? do_trap+0x390/0x390 [ 36.351081] ? skb_warn_bad_offload+0x2a9/0x380 [ 36.351723] ? vprintk_emit+0x3ea/0x590 [ 36.352269] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.352923] do_invalid_op+0x1b/0x20 [ 36.353427] invalid_op+0x18/0x20 [ 36.353899] RIP: 0010:skb_warn_bad_offload+0x2a9/0x380 [ 36.354600] RSP: 0018:ffff8801d1b870a0 EFLAGS: 00010282 [ 36.355317] RAX: 000000000000006b RBX: ffff8801ce311720 RCX: 0000000000000000 [ 36.356274] RDX: 000000000000006b RSI: 1ffff1003a370dd4 RDI: ffffed003a370e08 [ 36.357232] RBP: ffff8801d1b870f8 R08: ffff8801d1b86790 R09: 0000000000000000 [ 36.364472] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801ce6802c0 [ 36.371721] R13: 0000000000000000 R14: ffff8801ce6802c0 R15: 0000000000000700 [ 36.378992] __skb_gso_segment+0x607/0x7f0 [ 36.383209] ? skb_mac_gso_segment+0x660/0x660 [ 36.387773] validate_xmit_skb+0x4ba/0xb20 [ 36.391984] ? netif_skb_features+0x8e0/0x8e0 [ 36.396462] validate_xmit_skb_list+0xb7/0x120 [ 36.401018] sch_direct_xmit+0x3b6/0x6d0 [ 36.405057] ? dev_deactivate_queue.constprop.27+0x260/0x260 [ 36.410844] __dev_queue_xmit+0x15fe/0x1e40 [ 36.415137] ? __might_fault+0xe0/0x1d0 [ 36.419092] ? netdev_pick_tx+0x300/0x300 [ 36.423212] ? skb_set_owner_w+0x1ff/0x300 [ 36.427446] ? __might_sleep+0x95/0x190 [ 36.431396] ? kasan_check_write+0x14/0x20 [ 36.435607] ? copyin+0x91/0xb0 [ 36.438860] ? _copy_from_iter+0x367/0xf30 [ 36.443067] ? __check_object_size+0x25d/0x4f0 [ 36.447626] ? check_stack_object+0x140/0x140 [ 36.452098] ? copy_page_to_iter+0xd60/0xd60 [ 36.456481] ? _copy_from_iter_full+0x22b/0xbb0 [ 36.461120] ? __dev_get_by_index+0x1a0/0x1a0 [ 36.465595] ? skb_copy_datagram_from_iter+0x3a5/0x5a0 [ 36.470843] ? iov_iter_advance+0x13f0/0x13f0 [ 36.475309] ? sock_cmsg_send+0x1e1/0x260 [ 36.479445] dev_queue_xmit+0x17/0x20 [ 36.483219] packet_sendmsg+0x3bbf/0x6030 [ 36.487341] ? do_raw_spin_trylock+0x190/0x190 [ 36.491909] ? find_held_lock+0x39/0x1d0 [ 36.495970] ? packet_cached_dev_get+0x2b0/0x2b0 [ 36.500696] ? check_noncircular+0x20/0x20 [ 36.504904] ? lock_release+0xd70/0xd70 [ 36.508868] ? check_same_owner+0x320/0x320 [ 36.513177] ? __check_object_size+0x25d/0x4f0 [ 36.517747] ? __might_sleep+0x95/0x190 [ 36.521698] ? find_held_lock+0x39/0x1d0 [ 36.525744] ? lock_downgrade+0x990/0x990 [ 36.529871] ? sock_has_perm+0x29c/0x400 [ 36.533921] ? selinux_tun_dev_create+0xc0/0xc0 [ 36.538565] ? __bitmap_shift_left+0x8f/0x170 [ 36.543042] ? lock_release+0xd70/0xd70 [ 36.547011] ? security_socket_sendmsg+0x89/0xb0 [ 36.551759] ? packet_cached_dev_get+0x2b0/0x2b0 [ 36.556493] sock_sendmsg+0xca/0x110 [ 36.560180] ___sys_sendmsg+0x75b/0x8a0 [ 36.564128] ? copy_msghdr_from_user+0x590/0x590 [ 36.568874] ? fget_raw+0x20/0x20 [ 36.572305] ? handle_mm_fault+0x410/0x8d0 [ 36.576510] ? down_read_trylock+0xdb/0x170 [ 36.580805] ? __do_page_fault+0x2b8/0xb60 [ 36.585030] ? __fdget+0x18/0x20 [ 36.588372] __sys_sendmsg+0xe5/0x210 [ 36.592143] ? __sys_sendmsg+0xe5/0x210 [ 36.596093] ? SyS_shutdown+0x290/0x290 [ 36.600042] ? __do_page_fault+0xb60/0xb60 [ 36.604252] ? SyS_setsockopt+0x189/0x360 [ 36.608367] ? SyS_setsockopt+0x215/0x360 [ 36.612501] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 36.617495] SyS_sendmsg+0x2d/0x50 [ 36.621013] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 36.625738] RIP: 0033:0x445449 [ 36.628899] RSP: 002b:00000000007efe58 EFLAGS: 00000217 ORIG_RAX: 000000000000002e [ 36.636578] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445449 [ 36.643817] RDX: 0000000020000000 RSI: 0000000020f18000 RDI: 0000000000000004 [ 36.651057] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000 [ 36.658296] R10: 0000000000000004 R11: 0000000000000217 R12: 0000000000402aa0 [ 36.665547] R13: 0000000000402b30 R14: 0000000000000000 R15: 0000000000000000 [ 36.672998] Dumping ftrace buffer: [ 36.676639] (ftrace buffer empty) [ 36.680321] Kernel Offset: disabled [ 36.683926] Rebooting in 86400 seconds..