[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.667340] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.345664] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.900751] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.610016] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) [ 27.792395] random: sshd: uninitialized urandom read (32 bytes read, 80 bits of entropy available) Warning: Permanently added '10.128.10.4' (ECDSA) to the list of known hosts. [ 33.407641] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) 2018/08/22 20:43:17 parsed 1 programs [ 34.535827] random: cc1: uninitialized urandom read (8 bytes read, 86 bits of entropy available) 2018/08/22 20:43:19 executed programs: 0 [ 35.831019] IPVS: Creating netns size=2552 id=1 [ 36.075115] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 36.090863] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 36.174509] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 36.189629] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 36.270069] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 36.284873] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 36.302180] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 36.317327] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 36.361695] ip (3959) used greatest stack depth: 24432 bytes left [ 37.046333] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 37.086408] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 37.384358] hrtimer: interrupt took 11767 ns [ 37.474779] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 37.483031] IP: [] l2tp_session_create+0x948/0x1030 [ 37.489760] PGD 1d81be067 PUD 1ceb4d067 PMD 0 [ 37.494683] Oops: 0002 [#1] PREEMPT SMP KASAN [ 37.499622] Dumping ftrace buffer: [ 37.503136] (ftrace buffer empty) [ 37.506818] Modules linked in: [ 37.510175] CPU: 1 PID: 4244 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 37.517768] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.527101] task: ffff8801d7126000 task.stack: ffff8801d6ee0000 [ 37.533133] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 37.542243] RSP: 0018:ffff8801d6ee7b48 EFLAGS: 00010246 [ 37.547666] RAX: 0000000000000000 RBX: ffff8801da25a500 RCX: 0000000000000006 [ 37.554920] RDX: 1ffff1003b44b4d0 RSI: ffffffff835a4543 RDI: ffff8801da25a680 [ 37.562168] RBP: ffff8801d6ee7bb8 R08: ffff8801d7126900 R09: 0000000000000000 [ 37.569425] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801da25a328 [ 37.576672] R13: ffff8801d6ee7cd0 R14: ffff8801da25a280 R15: ffffffff835a3170 [ 37.584074] FS: 00007f0f64b7e700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.592341] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.598330] CR2: 0000000000000080 CR3: 00000001cd45e000 CR4: 00000000001606f0 [ 37.605575] Stack: [ 37.607696] ffffffff81140a6a ffff8801da25a520 ffff8801da25a3d8 ffff8801da25a290 [ 37.615679] ffffffff838cba90 ffff8801da25a330 ffff8801da25a3d0 ffff8801da25a5e0 [ 37.623668] ffff880100000000 ffff8801d6eccc80 0000000000000000 ffff8801d6ecccb0 [ 37.631662] Call Trace: [ 37.634228] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 37.640526] [] ? _raw_read_unlock_bh+0x30/0x40 [ 37.646734] [] pppol2tp_connect+0x10f0/0x1910 [ 37.652855] [] ? pppol2tp_recv+0x320/0x320 [ 37.658713] [] ? retint_kernel+0x2d/0x2d [ 37.664412] [] ? security_socket_connect+0x8f/0xc0 [ 37.670991] [] SYSC_connect+0x1b8/0x300 [ 37.676594] [] ? SYSC_perf_event_open+0x211/0x2470 [ 37.683151] [] ? SYSC_bind+0x280/0x280 [ 37.688676] [] ? do_futex+0x17f0/0x17f0 [ 37.694277] [] ? retint_user+0x18/0x3c [ 37.699800] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 37.706622] [] SyS_connect+0x24/0x30 [ 37.711965] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 37.718515] Code: 00 00 48 8d bb 80 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 36 06 00 00 48 8b 83 80 01 00 00 ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 f1 13 [ 37.745358] RIP [] l2tp_session_create+0x948/0x1030 [ 37.752236] RSP [ 37.755839] CR2: 0000000000000080 [ 37.759757] ---[ end trace ce9250db613183d4 ]--- [ 37.764494] Kernel panic - not syncing: Fatal exception [ 37.770086] Dumping ftrace buffer: [ 37.773599] (ftrace buffer empty) [ 37.777281] Kernel Offset: disabled [ 37.780887] Rebooting in 86400 seconds..