[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.273361] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 29.207406] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 29.533096] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 30.101434] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 42.653480] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. [ 48.365913] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) 2018/08/23 13:57:21 parsed 1 programs [ 49.631289] random: cc1: uninitialized urandom read (8 bytes read, 83 bits of entropy available) 2018/08/23 13:57:22 executed programs: 0 [ 50.749052] IPVS: Creating netns size=2552 id=1 [ 51.005788] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 51.021214] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 51.107768] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 51.124800] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 51.211541] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 51.228104] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 51.244433] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 51.264251] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 52.071846] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 52.112772] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 55.043844] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 55.052091] IP: [] l2tp_session_create+0x948/0x1030 [ 55.058773] PGD 1d3580067 PUD 1d08b6067 PMD 0 [ 55.063702] Oops: 0002 [#1] PREEMPT SMP KASAN [ 55.068712] Dumping ftrace buffer: [ 55.072229] (ftrace buffer empty) [ 55.075918] Modules linked in: [ 55.079214] CPU: 1 PID: 4775 Comm: syz-executor0 Not tainted 4.4.151-g37af2ff #21 [ 55.086826] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.096156] task: ffff8800b5dab000 task.stack: ffff8801d2818000 [ 55.102189] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 55.111306] RSP: 0018:ffff8801d281fad0 EFLAGS: 00010246 [ 55.116745] RAX: 0000000000000000 RBX: ffff8800b6179680 RCX: 0000000000000006 [ 55.124022] RDX: 1ffff10016c2f300 RSI: ffffffff835a4543 RDI: ffff8800b6179800 [ 55.131290] RBP: ffff8801d281fb40 R08: ffff8800b5dab900 R09: 0000000000000000 [ 55.138551] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b6179c28 [ 55.145809] R13: ffff8801d281fc58 R14: ffff8800b6179b80 R15: ffffffff835a3170 [ 55.153057] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7733b40 [ 55.161262] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 55.167125] CR2: 0000000000000080 CR3: 00000001d2fa2000 CR4: 00000000001606f0 [ 55.174378] Stack: [ 55.176506] ffffffff81140a6a ffff8800b61796a0 ffff8800b6179cd8 ffff8800b6179b90 [ 55.184515] ffffffff838cba90 ffff8800b6179c30 ffff8800b6179cd0 ffff8800b6179760 [ 55.192536] ffffffff00000000 ffff8801d797dd80 0000000000000000 ffff8801d797ddb0 [ 55.200558] Call Trace: [ 55.203124] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 55.209421] [] ? _raw_read_unlock_bh+0x30/0x40 [ 55.215646] [] pppol2tp_connect+0x10f0/0x1910 [ 55.221772] [] ? pppol2tp_recv+0x320/0x320 [ 55.227663] [] ? security_socket_connect+0x8f/0xc0 [ 55.234233] [] SYSC_connect+0x1b8/0x300 [ 55.239837] [] ? SYSC_bind+0x280/0x280 [ 55.245373] [] ? get_unused_fd_flags+0xd0/0xd0 [ 55.251588] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 55.258579] [] ? SyS_socket+0x121/0x1b0 [ 55.264184] [] ? move_addr_to_kernel+0x50/0x50 [ 55.270407] [] SyS_connect+0x24/0x30 [ 55.275776] [] ? SyS_accept+0x30/0x30 [ 55.281217] [] do_fast_syscall_32+0x324/0x8b0 [ 55.287344] [] sysenter_flags_fixed+0xd/0x1a [ 55.293378] 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 [ 55.320647] RIP [] l2tp_session_create+0x948/0x1030 [ 55.327415] RSP [ 55.331015] CR2: 0000000000000080 [ 55.334613] ---[ end trace 09d40d0a9b85e056 ]--- [ 55.339377] Kernel panic - not syncing: Fatal exception [ 55.345034] Dumping ftrace buffer: [ 55.348555] (ftrace buffer empty) [ 55.352258] Kernel Offset: disabled [ 55.355874] Rebooting in 86400 seconds..