[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.078378] 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: [ 26.946565] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.245383] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.942957] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 39.527656] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) Warning: Permanently added '10.128.10.6' (ECDSA) to the list of known hosts. [ 45.086496] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) 2018/08/22 06:12:28 parsed 1 programs [ 46.257227] random: cc1: uninitialized urandom read (8 bytes read, 80 bits of entropy available) 2018/08/22 06:12:30 executed programs: 0 [ 47.581412] IPVS: Creating netns size=2552 id=1 [ 47.825378] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 47.840823] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 47.923904] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 47.938872] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 48.021971] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 48.037086] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 48.053760] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 48.070829] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 48.816459] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 48.857833] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 49.182463] hrtimer: interrupt took 21452 ns [ 50.339922] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 50.348191] IP: [] l2tp_session_create+0x948/0x1030 [ 50.354883] PGD 1d4610067 PUD 1d4845067 PMD 0 [ 50.359814] Oops: 0002 [#1] PREEMPT SMP KASAN [ 50.364797] Dumping ftrace buffer: [ 50.368310] (ftrace buffer empty) [ 50.372015] Modules linked in: [ 50.375308] CPU: 0 PID: 4471 Comm: syz-executor0 Not tainted 4.4.150-g5541782 #83 [ 50.382907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.392241] task: ffff8801d4680000 task.stack: ffff8801d9b30000 [ 50.398297] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 50.407424] RSP: 0018:ffff8801d9b37b48 EFLAGS: 00010246 [ 50.412852] RAX: 0000000000000000 RBX: ffff8801d4bb0c80 RCX: 0000000000000006 [ 50.420107] RDX: 1ffff1003a9761c0 RSI: ffffffff835a3493 RDI: ffff8801d4bb0e00 [ 50.427358] RBP: ffff8801d9b37bb8 R08: ffff8801d4680900 R09: 0000000000000000 [ 50.434895] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d4add9a8 [ 50.442145] R13: ffff8801d9b37cd0 R14: ffff8801d4add900 R15: ffffffff835a20c0 [ 50.449393] FS: 00007f2dfa0b2700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 50.457614] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.463476] CR2: 0000000000000080 CR3: 00000001d3d5e000 CR4: 00000000001606f0 [ 50.470724] Stack: [ 50.472849] ffffffff8114094a ffff8801d4bb0ca0 ffff8801d4adda58 ffff8801d4add910 [ 50.480891] ffffffff838caa10 ffff8801d4add9b0 ffff8801d4adda50 ffff8801d4bb0d60 [ 50.488989] ffffffff00000000 ffff8801d60fa200 0000000000000000 ffff8801d60fa230 [ 50.496989] Call Trace: [ 50.499556] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 50.505854] [] ? _raw_read_unlock_bh+0x30/0x40 [ 50.512065] [] pppol2tp_connect+0x10f0/0x1910 [ 50.518202] [] ? pppol2tp_recv+0x320/0x320 [ 50.524069] [] ? security_socket_connect+0x8f/0xc0 [ 50.530655] [] SYSC_connect+0x1b8/0x300 [ 50.536262] [] ? SYSC_bind+0x280/0x280 [ 50.541777] [] ? get_unused_fd_flags+0xd0/0xd0 [ 50.547988] [] ? do_futex+0x17f0/0x17f0 [ 50.553590] [] ? SyS_socket+0x121/0x1b0 [ 50.559197] [] ? move_addr_to_kernel+0x50/0x50 [ 50.565406] [] SyS_connect+0x24/0x30 [ 50.570756] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 50.577308] 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 [ 50.604299] RIP [] l2tp_session_create+0x948/0x1030 [ 50.611099] RSP [ 50.614703] CR2: 0000000000000080 [ 50.619016] ---[ end trace fdef70d624cd846a ]--- [ 50.623780] Kernel panic - not syncing: Fatal exception [ 50.629415] Dumping ftrace buffer: [ 50.632954] (ftrace buffer empty) [ 50.636644] Kernel Offset: disabled [ 50.640250] Rebooting in 86400 seconds..