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-0,10.128.15.208' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 43.200390] device syz0 entered promiscuous mode [ 43.203630] ------------[ cut here ]------------ [ 43.204350] WARNING: CPU: 1 PID: 3280 at net/core/dev.c:2465 skb_warn_bad_offload+0x2af/0x390 [ 43.205523] syz0: caps=(0x00000400000058c1, 0x0000000000000000) len=392 data_len=0 gso_size=127 gso_type=5 ip_summed=0 [ 43.206957] Kernel panic - not syncing: panic_on_warn set ... [ 43.206957] [ 43.207921] CPU: 1 PID: 3280 Comm: syzkaller108295 Not tainted 4.9.66-gb763480 #103 [ 43.208938] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.210156] ffff8801c7d77370 ffffffff81d90749 ffffffff83a46d00 ffff8801c7d77448 [ 43.211284] ffffffff83ee0b00 ffffffff82f2c24f 0000000000000009 ffff8801c7d77438 [ 43.212412] ffffffff8142c411 0000000041b58ab3 ffffffff84186e58 ffffffff8142c255 [ 43.213556] Call Trace: [ 43.213911] [] dump_stack+0xc1/0x128 [ 43.214620] [] ? skb_warn_bad_offload+0x2af/0x390 [ 43.215473] [] panic+0x1bc/0x3a8 [ 43.216153] [] ? percpu_up_read_preempt_enable.constprop.54+0xd7/0xd7 [ 43.217229] [] ? vprintk_emit+0x3ad/0x750 [ 43.218009] [] ? skb_warn_bad_offload+0x2af/0x390 [ 43.218863] [] __warn+0x1c4/0x1e0 [ 43.219537] [] warn_slowpath_fmt+0xc4/0x110 [ 43.220322] [] ? __warn+0x1e0/0x1e0 [ 43.221021] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 43.227912] [] ? ___ratelimit+0x53/0x460 [ 43.233585] [] skb_warn_bad_offload+0x2af/0x390 [ 43.239870] [] __skb_gso_segment+0x52b/0x670 [ 43.245891] [] validate_xmit_skb+0x44e/0x980 [ 43.251913] [] validate_xmit_skb_list+0xb7/0x120 [ 43.258286] [] sch_direct_xmit+0x34a/0x5d0 [ 43.264137] [] ? dev_deactivate_queue.constprop.28+0x150/0x150 [ 43.271723] [] ? dev_queue_xmit+0x17/0x20 [ 43.277484] [] __dev_queue_xmit+0x15fd/0x1e60 [ 43.283589] [] ? dev_queue_xmit+0x17/0x20 [ 43.289352] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 43.296242] [] ? netdev_pick_tx+0x300/0x300 [ 43.302178] [] ? rcu_read_unlock_special+0x5b7/0x990 [ 43.308895] [] ? tun_select_queue+0x30a/0x480 [ 43.315005] [] ? tun_select_queue+0x331/0x480 [ 43.321112] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 43.327307] [] ? tun_chr_read_iter+0x1f0/0x1f0 [ 43.333505] [] dev_queue_xmit+0x17/0x20 [ 43.339096] [] packet_sendmsg+0x2ccc/0x4760 [ 43.345032] [] ? assoc_array_gc+0x12c1/0x1300 [ 43.351141] [] ? packet_cached_dev_get+0x200/0x200 [ 43.357684] [] ? sock_has_perm+0x292/0x3e0 [ 43.363527] [] ? sock_has_perm+0x9f/0x3e0 [ 43.369289] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 43.376354] [] ? release_pages+0x595/0x930 [ 43.382201] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 43.388658] [] ? security_socket_sendmsg+0x89/0xb0 [ 43.395202] [] ? packet_cached_dev_get+0x200/0x200 [ 43.401744] [] sock_sendmsg+0xca/0x110 [ 43.407245] [] sock_write_iter+0x226/0x3b0 [ 43.413096] [] ? avc_has_perm_noaudit+0x450/0x450 [ 43.419551] [] ? sock_sendmsg+0x110/0x110 [ 43.425312] [] ? iov_iter_init+0xaf/0x1d0 [ 43.431072] [] __vfs_write+0x4bf/0x680 [ 43.436571] [] ? do_iter_readv_writev+0x400/0x400 [ 43.443025] [] ? selinux_file_permission+0x82/0x460 [ 43.449653] [] ? rw_verify_area+0xe5/0x2b0 [ 43.455500] [] vfs_write+0x189/0x530 [ 43.460834] [] SyS_write+0xd9/0x1b0 [ 43.466074] [] ? SyS_read+0x1b0/0x1b0 [ 43.471486] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 43.478289] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 43.484831] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 43.491493] Dumping ftrace buffer: [ 43.495017] (ftrace buffer empty) [ 43.498691] Kernel Offset: disabled [ 43.502292] Rebooting in 86400 seconds..