[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.227284] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.451996] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.737637] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.477946] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 27.663927] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 33.174305] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) 2018/08/23 21:14:33 parsed 1 programs [ 34.403842] random: cc1: uninitialized urandom read (8 bytes read, 78 bits of entropy available) 2018/08/23 21:14:35 executed programs: 0 [ 35.510441] IPVS: Creating netns size=2552 id=1 [ 35.746574] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 35.761830] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 35.841985] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 35.857479] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 35.935967] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 35.950361] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 35.965942] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 35.983558] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 36.698009] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 36.735848] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 38.223457] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 38.231774] IP: [] l2tp_session_create+0x948/0x1030 [ 38.238460] PGD 1d2bd3067 PUD 1d3e05067 PMD 0 [ 38.243456] Oops: 0002 [#1] PREEMPT SMP KASAN [ 38.248404] Dumping ftrace buffer: [ 38.251917] (ftrace buffer empty) [ 38.255604] Modules linked in: [ 38.258890] CPU: 1 PID: 4578 Comm: syz-executor0 Not tainted 4.4.151-g3a2ec58 #86 [ 38.266481] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.275810] task: ffff8801c6f08000 task.stack: ffff8801da360000 [ 38.281840] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 38.290960] RSP: 0018:ffff8801da367b48 EFLAGS: 00010246 [ 38.296419] RAX: 0000000000000000 RBX: ffff8801d3762a00 RCX: 0000000000000006 [ 38.303663] RDX: 1ffff1003a6ec570 RSI: ffffffff835a4633 RDI: ffff8801d3762b80 [ 38.310906] RBP: ffff8801da367bb8 R08: ffff8801c6f08900 R09: 0000000000000000 [ 38.318163] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d3762828 [ 38.325413] R13: ffff8801da367cd0 R14: ffff8801d3762780 R15: ffffffff835a3260 [ 38.332659] FS: 00007f9bb7722700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 38.340861] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.346735] CR2: 0000000000000080 CR3: 00000001d2bd0000 CR4: 00000000001606f0 [ 38.353986] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 38.361230] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 38.368474] Stack: [ 38.370604] ffffffff81140a6a ffff8801d3762a20 ffff8801d37628d8 ffff8801d3762790 [ 38.378622] ffffffff838cbb80 ffff8801d3762830 ffff8801d37628d0 ffff8801d3762ae0 [ 38.386606] ffffffff00000000 ffff8801d899bb80 0000000000000000 ffff8801d899bbb0 [ 38.394608] Call Trace: [ 38.397173] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 38.403471] [] ? _raw_read_unlock_bh+0x30/0x40 [ 38.409681] [] pppol2tp_connect+0x10f0/0x1910 [ 38.415800] [] ? pppol2tp_recv+0x320/0x320 [ 38.421666] [] ? security_socket_connect+0x8f/0xc0 [ 38.428232] [] SYSC_connect+0x1b8/0x300 [ 38.433832] [] ? SYSC_bind+0x280/0x280 [ 38.439344] [] ? get_unused_fd_flags+0xd0/0xd0 [ 38.445550] [] ? do_futex+0x17f0/0x17f0 [ 38.451386] [] ? SyS_socket+0x121/0x1b0 [ 38.456992] [] ? move_addr_to_kernel+0x50/0x50 [ 38.463201] [] SyS_connect+0x24/0x30 [ 38.468544] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 38.475090] 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 [ 38.501889] RIP [] l2tp_session_create+0x948/0x1030 [ 38.508650] RSP [ 38.512248] CR2: 0000000000000080 [ 38.516501] ---[ end trace 163a250e7007a877 ]--- [ 38.521279] Kernel panic - not syncing: Fatal exception [ 38.527094] Dumping ftrace buffer: [ 38.530614] (ftrace buffer empty) [ 38.534297] Kernel Offset: disabled [ 38.537895] Rebooting in 86400 seconds..