[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.574400] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.978637] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.367072] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.020111] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) [ 71.405951] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) Warning: Permanently added '10.128.10.35' (ECDSA) to the list of known hosts. [ 76.976303] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) 2018/08/22 08:30:18 parsed 1 programs [ 78.419975] random: cc1: uninitialized urandom read (8 bytes read, 86 bits of entropy available) 2018/08/22 08:30:21 executed programs: 0 [ 80.128611] IPVS: Creating netns size=2552 id=1 [ 80.375305] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 80.391467] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 80.474011] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 80.489339] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 80.570702] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 80.586299] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 80.602282] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 80.618491] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 81.347725] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 81.387132] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready 2018/08/22 08:30:26 executed programs: 318 2018/08/22 08:30:31 executed programs: 755 [ 93.081930] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 93.090207] IP: [] l2tp_session_create+0x948/0x1030 [ 93.096892] PGD b7a50067 PUD b5acd067 PMD 0 [ 93.101637] Oops: 0002 [#1] PREEMPT SMP KASAN [ 93.106606] Dumping ftrace buffer: [ 93.110117] (ftrace buffer empty) [ 93.113804] Modules linked in: [ 93.117104] CPU: 0 PID: 7787 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 93.124699] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 93.134035] task: ffff8801d8f3b000 task.stack: ffff8800bb3d8000 [ 93.140069] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 93.149206] RSP: 0018:ffff8800bb3dfb48 EFLAGS: 00010246 [ 93.154635] RAX: 0000000000000000 RBX: ffff8800b215e000 RCX: 0000000000000006 [ 93.161884] RDX: 1ffff1001642bc30 RSI: ffffffff835a4543 RDI: ffff8800b215e180 [ 93.169135] RBP: ffff8800bb3dfbb8 R08: ffff8801d8f3b900 R09: 0000000000000000 [ 93.176402] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b215eaa8 [ 93.183654] R13: ffff8800bb3dfcd0 R14: ffff8800b215ea00 R15: ffffffff835a3170 [ 93.190906] FS: 00007f36027ac700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 93.199131] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 93.205001] CR2: 0000000000000080 CR3: 00000000b9161000 CR4: 00000000001606f0 [ 93.212263] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 93.219514] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 93.226763] Stack: [ 93.228894] ffffffff81140a6a ffff8800b215e020 ffff8800b215eb58 ffff8800b215ea10 [ 93.236895] ffffffff838cba90 ffff8800b215eab0 ffff8800b215eb50 ffff8800b215e0e0 [ 93.244887] ffffffff00000000 ffff8800bb36aa80 0000000000000000 ffff8800bb36aab0 [ 93.252878] Call Trace: [ 93.255456] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 93.261759] [] ? _raw_read_unlock_bh+0x30/0x40 [ 93.267973] [] pppol2tp_connect+0x10f0/0x1910 [ 93.274098] [] ? pppol2tp_recv+0x320/0x320 [ 93.279966] [] ? security_socket_connect+0x8f/0xc0 [ 93.286530] [] SYSC_connect+0x1b8/0x300 [ 93.292133] [] ? SYSC_bind+0x280/0x280 [ 93.297650] [] ? get_unused_fd_flags+0xd0/0xd0 [ 93.303865] [] ? do_futex+0x17f0/0x17f0 [ 93.309470] [] ? SyS_socket+0x121/0x1b0 [ 93.315077] [] ? move_addr_to_kernel+0x50/0x50 [ 93.321289] [] SyS_connect+0x24/0x30 [ 93.326636] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 93.333202] 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 [ 93.360099] RIP [] l2tp_session_create+0x948/0x1030 [ 93.366868] RSP [ 93.370471] CR2: 0000000000000080 [ 93.375368] ---[ end trace 39070b9cebecc2b3 ]--- [ 93.380135] Kernel panic - not syncing: Fatal exception [ 93.385879] Dumping ftrace buffer: [ 93.389407] (ftrace buffer empty) [ 93.393093] Kernel Offset: disabled [ 93.396698] Rebooting in 86400 seconds..