INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?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-5,10.128.15.217' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 18.669381] IPVS: Creating netns size=2536 id=1 [ 18.714063] ------------[ cut here ]------------ [ 18.718841] WARNING: CPU: 1 PID: 3226 at net/core/dev.c:2465 skb_warn_bad_offload+0x2af/0x390 [ 18.727505] sit1: caps=(0x00000000803b5869, 0x0000000000000000) len=205 data_len=0 gso_size=55468 gso_type=4 ip_summed=0 [ 18.738499] Kernel panic - not syncing: panic_on_warn set ... [ 18.738499] [ 18.745845] CPU: 1 PID: 3226 Comm: syzkaller163532 Not tainted 4.9.61-ga93e312 #85 [ 18.753517] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.762841] ffff8801d071f308 ffffffff81d91589 ffffffff83a46ba0 ffff8801d071f3e0 [ 18.770812] ffffffff83ee0300 ffffffff82f2c1ff 0000000000000009 ffff8801d071f3d0 [ 18.778774] ffffffff8142e391 0000000041b58ab3 ffffffff84185db0 ffffffff8142e1d5 [ 18.786736] Call Trace: [ 18.789298] [] dump_stack+0xc1/0x128 [ 18.794633] [] ? skb_warn_bad_offload+0x2af/0x390 [ 18.801093] [] panic+0x1bc/0x3a8 [ 18.806081] [] ? percpu_up_read_preempt_enable.constprop.54+0xd7/0xd7 [ 18.814275] [] ? vprintk_emit+0x3ad/0x750 [ 18.820042] [] ? skb_warn_bad_offload+0x2af/0x390 [ 18.826500] [] __warn+0x1c4/0x1e0 [ 18.831576] [] warn_slowpath_fmt+0xc4/0x110 [ 18.837519] [] ? __warn+0x1e0/0x1e0 [ 18.842762] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 18.849657] [] ? ___ratelimit+0x53/0x460 [ 18.855339] [] skb_warn_bad_offload+0x2af/0x390 [ 18.861626] [] __skb_gso_segment+0x52b/0x670 [ 18.867651] [] validate_xmit_skb+0x44e/0x980 [ 18.873675] [] ? check_preemption_disabled+0x3b/0x200 [ 18.880479] [] ? check_preemption_disabled+0x3b/0x200 [ 18.887291] [] __dev_queue_xmit+0xa17/0x1e60 [ 18.893322] [] ? __dev_queue_xmit+0x1d4/0x1e60 [ 18.899538] [] ? 0xffffffff810002b8 [ 18.904790] [] ? netdev_pick_tx+0x300/0x300 [ 18.910740] [] ? skb_copy_datagram_from_iter+0x38c/0x5a0 [ 18.917808] [] ? copy_from_iter+0x2d0/0x960 [ 18.923746] [] ? dev_get_by_index+0x1fb/0x300 [ 18.929857] [] ? sock_cmsg_send+0x1e1/0x260 [ 18.935799] [] dev_queue_xmit+0x17/0x20 [ 18.941397] [] packet_sendmsg+0x2ccc/0x4760 [ 18.947341] [] ? inet6_fill_ifinfo+0x762/0x980 [ 18.953541] [] ? assoc_array_gc+0x1251/0x1300 [ 18.959653] [] ? packet_cached_dev_get+0x200/0x200 [ 18.966198] [] ? sock_has_perm+0x292/0x3e0 [ 18.972053] [] ? sock_has_perm+0x9f/0x3e0 [ 18.977820] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 18.984892] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 18.991354] [] ? security_socket_sendmsg+0x89/0xb0 [ 18.997902] [] ? packet_cached_dev_get+0x200/0x200 [ 19.004463] [] sock_sendmsg+0xca/0x110 [ 19.009971] [] ___sys_sendmsg+0x320/0x7e0 [ 19.015735] [] ? copy_msghdr_from_user+0x510/0x510 [ 19.022294] [] ? kasan_unpoison_shadow+0x35/0x50 [ 19.028666] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 19.035655] [] ? __lock_is_held+0xa1/0xf0 [ 19.041423] [] ? __lru_cache_add+0x187/0x250 [ 19.047450] [] ? __fget_light+0x158/0x1e0 [ 19.053223] [] ? __fdget+0x18/0x20 [ 19.058479] [] ? sockfd_lookup_light+0x118/0x160 [ 19.064851] [] __sys_sendmmsg+0x159/0x3a0 [ 19.070615] [] ? SyS_sendmsg+0x50/0x50 [ 19.076118] [] ? up_read+0x1a/0x40 [ 19.081275] [] ? __do_page_fault+0x3c6/0xd70 [ 19.087305] [] ? SyS_setsockopt+0x17f/0x250 [ 19.093244] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 19.100048] [] SyS_sendmmsg+0x35/0x60 [ 19.105465] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 19.112453] Dumping ftrace buffer: [ 19.115986] (ftrace buffer empty) [ 19.119661] Kernel Offset: disabled [ 19.123261] Rebooting in 86400 seconds..