[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.351253] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.781127] random: sshd: uninitialized urandom read (32 bytes read) [ 18.265153] random: sshd: uninitialized urandom read (32 bytes read) [ 18.743082] random: sshd: uninitialized urandom read (32 bytes read) [ 18.881763] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.14' (ECDSA) to the list of known hosts. [ 24.393874] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/23 20:20:36 parsed 1 programs [ 25.994954] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/23 20:20:38 executed programs: 0 [ 27.255677] IPVS: Creating netns size=2536 id=1 [ 27.377086] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 27.388630] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 27.431561] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 27.442825] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 27.485345] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 27.496628] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 27.509065] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 27.522943] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 28.022814] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 28.047539] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 28.053702] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 28.061351] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 28.262108] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 28.270351] IP: [] l2tp_session_create+0xc60/0x16f0 [ 28.277030] PGD 1d98c9067 [ 28.279669] PUD 1d73c6067 PMD 0 [ 28.283159] [ 28.284781] Oops: 0002 [#1] PREEMPT SMP KASAN [ 28.289315] Dumping ftrace buffer: [ 28.292904] (ftrace buffer empty) [ 28.296599] Modules linked in: [ 28.299940] CPU: 0 PID: 4173 Comm: syz-executor0 Not tainted 4.9.123-g7fa8c15 #32 [ 28.307532] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.316863] task: ffff8801d73e1800 task.stack: ffff8801d5608000 [ 28.323001] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 28.332123] RSP: 0018:ffff8801d560fab0 EFLAGS: 00010246 [ 28.337652] RAX: 0000000000000000 RBX: ffff8801d6e28f00 RCX: 1ffff1003ae7c41d [ 28.344901] RDX: 1ffff100380a49c0 RSI: ffff8801d73e20c8 RDI: ffff8801c0524e00 [ 28.352151] RBP: ffff8801d560fb50 R08: ffff8801d73e20e8 R09: 0000000000000000 [ 28.359399] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c0524cd8 [ 28.366646] R13: 0000000000000000 R14: ffff8801c0524c80 R15: ffff8801d560fc68 [ 28.373895] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7742b40 [ 28.382096] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.387953] CR2: 0000000000000080 CR3: 00000001d7fbc000 CR4: 00000000001606f0 [ 28.395202] Stack: [ 28.397331] 0000000000000201 ffffffff836ca241 ffff8801d560fad0 ffffffff81237f0d [ 28.405380] ffff8801c0524c80 ffff8801d6e29058 ffff8801c0524cd8 ffff8801d6e29050 [ 28.413434] ffff8801d6e28fb0 ffff8801c0524ca0 0000000000000000 0000000000000000 [ 28.421426] Call Trace: [ 28.423991] [] ? l2tp_session_get+0x1d1/0x790 [ 28.430120] [] ? trace_hardirqs_on+0xd/0x10 [ 28.436068] [] pppol2tp_connect+0x10d7/0x18f0 [ 28.442187] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 28.448394] [] ? security_socket_connect+0x8f/0xc0 [ 28.454948] [] SYSC_connect+0x1b8/0x300 [ 28.460549] [] ? SYSC_bind+0x280/0x280 [ 28.466067] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 28.473060] [] ? move_addr_to_kernel+0x50/0x50 [ 28.479278] [] SyS_connect+0x24/0x30 [ 28.484622] [] ? SyS_accept+0x30/0x30 [ 28.490061] [] do_fast_syscall_32+0x2f7/0x870 [ 28.496198] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.502844] [] entry_SYSENTER_compat+0x90/0xa2 [ 28.509050] Code: 00 00 49 8d be 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 7b 09 00 00 49 8b 86 80 01 00 00 ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 [ 28.535924] RIP [] l2tp_session_create+0xc60/0x16f0 [ 28.542704] RSP [ 28.546414] CR2: 0000000000000080 [ 28.550537] ---[ end trace 5cd4c4c4c7454b8a ]--- [ 28.555330] Kernel panic - not syncing: Fatal exception [ 28.560966] Dumping ftrace buffer: [ 28.564498] (ftrace buffer empty) [ 28.568186] Kernel Offset: disabled [ 28.571788] Rebooting in 86400 seconds..