[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.465018] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 20.720545] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.538275] random: sshd: uninitialized urandom read (32 bytes read, 97 bits of entropy available) [ 39.285361] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) Warning: Permanently added '10.128.0.50' (ECDSA) to the list of known hosts. [ 44.652912] random: sshd: uninitialized urandom read (32 bytes read, 114 bits of entropy available) executing program [ 44.755684] IPVS: Creating netns size=2552 id=1 [ 44.781312] ------------[ cut here ]------------ [ 44.786084] WARNING: CPU: 0 PID: 3323 at net/core/dev.c:2449 skb_warn_bad_offload+0x2af/0x390() [ 44.794920] sit1: caps=(0x00000000001b5869, 0x0000000000000000) len=205 data_len=0 gso_size=55468 gso_type=4 ip_summed=0 [ 44.805971] Kernel panic - not syncing: panic_on_warn set ... [ 44.805971] [ 44.813301] CPU: 0 PID: 3323 Comm: syzkaller932647 Not tainted 4.4.107-g610c835 #12 [ 44.821059] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.830384] 0000000000000000 5e908135d09ce0c8 ffff8801d152f3a8 ffffffff81d0457d [ 44.838337] ffffffff838429a0 ffff8801d152f480 ffffffff83ca99a0 0000000000000009 [ 44.846287] 0000000000000991 ffff8801d152f470 ffffffff8141774a 0000000041b58ab3 [ 44.854259] Call Trace: [ 44.856814] [] dump_stack+0xc1/0x124 [ 44.862142] [] panic+0x1aa/0x388 [ 44.867124] [] ? percpu_up_read.constprop.45+0xe1/0xe1 [ 44.874017] [] ? warn_slowpath_common+0x10a/0x140 [ 44.880477] [] warn_slowpath_common+0x125/0x140 [ 44.886764] [] ? skb_warn_bad_offload+0x2af/0x390 [ 44.893223] [] warn_slowpath_fmt+0xc1/0x110 [ 44.899161] [] ? warn_slowpath_common+0x140/0x140 [ 44.905622] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 44.912521] [] ? ___ratelimit+0x53/0x3e0 [ 44.918198] [] skb_warn_bad_offload+0x2af/0x390 [ 44.924491] [] __skb_gso_segment+0x3b3/0x4a0 [ 44.930517] [] validate_xmit_skb.isra.100.part.101+0x44e/0x970 [ 44.938105] [] ? check_preemption_disabled+0x3b/0x200 [ 44.944912] [] __dev_queue_xmit+0x13cf/0x1a70 [ 44.951021] [] ? __dev_queue_xmit+0x1a6/0x1a70 [ 44.957219] [] ? netdev_pick_tx+0x310/0x310 [ 44.963155] [] ? copy_from_iter+0x293/0x890 [ 44.969091] [] dev_queue_xmit+0x17/0x20 [ 44.974683] [] packet_sendmsg+0x29b2/0x47e0 [ 44.980639] [] ? avc_has_perm_noaudit+0x460/0x460 [ 44.987098] [] ? packet_cached_dev_get+0x200/0x200 [ 44.993661] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 45.000728] [] ? selinux_socket_sendmsg+0x3f/0x50 [ 45.007196] [] ? security_socket_sendmsg+0x89/0xb0 [ 45.013753] [] ? packet_cached_dev_get+0x200/0x200 [ 45.020301] [] sock_sendmsg+0xca/0x110 [ 45.025828] [] ___sys_sendmsg+0x312/0x7c0 [ 45.031593] [] ? do_page_fault+0x27/0x30 [ 45.037270] [] ? copy_msghdr_from_user+0x550/0x550 [ 45.043814] [] ? __lock_is_held+0xa1/0xf0 [ 45.049578] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 45.056297] [] ? __fget_light+0xa1/0x1e0 [ 45.061973] [] ? __fdget+0x18/0x20 [ 45.067129] [] ? sockfd_lookup_light+0x118/0x160 [ 45.073500] [] __sys_sendmmsg+0x11c/0x2e0 [ 45.079274] [] ? SyS_sendmsg+0x50/0x50 [ 45.084778] [] ? _raw_spin_unlock+0x2c/0x50 [ 45.090716] [] ? handle_mm_fault+0x3f2/0x3190 [ 45.096828] [] ? __do_page_fault+0x380/0xa00 [ 45.102855] [] ? retint_user+0x18/0x20 [ 45.108365] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 45.115178] [] SyS_sendmmsg+0x35/0x60 [ 45.120594] [] entry_SYSCALL_64_fastpath+0x16/0x76 [ 45.127267] Dumping ftrace buffer: [ 45.130803] (ftrace buffer empty) [ 45.134481] Kernel Offset: disabled [ 45.138089] Rebooting in 86400 seconds..