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-5,10.128.15.214' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 syzkaller login: [ 32.194601] IPVS: Creating netns size=2536 id=1 executing program [ 32.282778] ------------[ cut here ]------------ [ 32.287540] WARNING: CPU: 0 PID: 3240 at net/core/dev.c:2462 skb_warn_bad_offload+0x2af/0x390 [ 32.296211] syz0: caps=(0x00000400000058c1, 0x0000000000000000) len=170 data_len=0 gso_size=17408 gso_type=5 ip_summed=0 [ 32.307207] Kernel panic - not syncing: panic_on_warn set ... [ 32.307207] [ 32.314536] CPU: 0 PID: 3240 Comm: syzkaller322729 Not tainted 4.9.43-g7073fca #25 [ 32.322208] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.331531] ffff8801d853f200 ffffffff81d92909 ffffffff83a46b40 ffff8801d853f2d8 [ 32.339460] ffffffff83edf700 ffffffff82f292cf 0000000000000009 ffff8801d853f2c8 [ 32.347388] ffffffff8142e0e1 0000000041b58ab3 ffffffff84184118 ffffffff8142df25 [ 32.355318] Call Trace: [ 32.357871] [] dump_stack+0xc1/0x128 [ 32.363203] [] ? skb_warn_bad_offload+0x2af/0x390 [ 32.369660] [] panic+0x1bc/0x3a8 [ 32.374641] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 32.382835] [] ? vprintk_emit+0x3ad/0x750 [ 32.388599] [] ? skb_warn_bad_offload+0x2af/0x390 [ 32.395058] [] __warn+0x1c4/0x1e0 [ 32.400128] [] warn_slowpath_fmt+0xc4/0x110 [ 32.406064] [] ? __warn+0x1e0/0x1e0 [ 32.411307] [] ? ___ratelimit+0x214/0x460 [ 32.417068] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 32.423956] [] ? ___ratelimit+0x53/0x460 [ 32.429739] [] skb_warn_bad_offload+0x2af/0x390 [ 32.436022] [] __skb_gso_segment+0x52b/0x670 [ 32.442040] [] validate_xmit_skb+0x44e/0x980 [ 32.448064] [] validate_xmit_skb_list+0xb7/0x120 [ 32.454438] [] sch_direct_xmit+0x34a/0x5d0 [ 32.460289] [] ? dev_deactivate_queue.constprop.28+0x150/0x150 [ 32.467878] [] ? dev_queue_xmit+0x17/0x20 [ 32.473641] [] __dev_queue_xmit+0x15fd/0x1e60 [ 32.479755] [] ? dev_queue_xmit+0x17/0x20 [ 32.485517] [] ? 0xffffffff810002b8 [ 32.490765] [] ? netdev_pick_tx+0x300/0x300 [ 32.496710] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 32.502907] [] ? tun_select_queue+0x30a/0x480 [ 32.509020] [] ? tun_select_queue+0x331/0x480 [ 32.515129] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 32.521325] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 32.527520] [] dev_queue_xmit+0x17/0x20 [ 32.533106] [] packet_sendmsg+0x2d07/0x47e0 [ 32.539044] [] ? migrate_swap_stop+0x920/0x920 [ 32.545244] [] ? packet_cached_dev_get+0x200/0x200 [ 32.551786] [] ? sock_has_perm+0x292/0x3e0 [ 32.557631] [] ? sock_has_perm+0x9f/0x3e0 [ 32.563389] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 32.570459] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 32.576914] [] ? security_socket_sendmsg+0x89/0xb0 [ 32.583458] [] ? packet_cached_dev_get+0x200/0x200 [ 32.590001] [] sock_sendmsg+0xca/0x110 [ 32.595503] [] ___sys_sendmsg+0x320/0x7e0 [ 32.601281] [] ? copy_msghdr_from_user+0x510/0x510 [ 32.607825] [] ? kasan_unpoison_shadow+0x35/0x50 [ 32.614206] [] ? release_pages+0x595/0x930 [ 32.620058] [] ? __pagevec_lru_add_fn+0x7b0/0x7b0 [ 32.626515] [] ? __pagevec_lru_add_fn+0x35e/0x7b0 [ 32.632973] [] ? __lru_cache_add+0x187/0x250 [ 32.638996] [] ? __fget_light+0x158/0x1e0 [ 32.644757] [] ? __fdget+0x18/0x20 [ 32.649919] [] ? sockfd_lookup_light+0x118/0x160 [ 32.656293] [] __sys_sendmmsg+0x159/0x3a0 [ 32.662055] [] ? SyS_sendmsg+0x50/0x50 [ 32.667572] [] ? handle_mm_fault+0x6ee/0x2510 [ 32.673680] [] ? __pmd_alloc+0x410/0x410 [ 32.679365] [] ? __do_page_fault+0x2a7/0xbd0 [ 32.685386] [] ? __do_page_fault+0x510/0xbd0 [ 32.691411] [] ? up_read+0x1a/0x40 [ 32.696568] [] ? __do_page_fault+0x33f/0xbd0 [ 32.702591] [] SyS_sendmmsg+0x35/0x60 [ 32.708012] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 32.714883] Dumping ftrace buffer: [ 32.718389] (ftrace buffer empty) [ 32.722064] Kernel Offset: disabled [ 32.725655] Rebooting in 86400 seconds..