[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.748221] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.003605] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 21.320669] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.034011] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) [ 23.376558] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.0.42' (ECDSA) to the list of known hosts. [ 29.025211] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) 2018/08/23 19:50:38 parsed 1 programs [ 30.863768] random: cc1: uninitialized urandom read (8 bytes read, 78 bits of entropy available) 2018/08/23 19:50:41 executed programs: 0 [ 32.638939] IPVS: Creating netns size=2552 id=1 [ 32.887476] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 32.903209] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 32.986571] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 33.002451] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 33.086573] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 33.102105] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 33.120165] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 33.138556] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 33.183169] ip (3905) used greatest stack depth: 24432 bytes left [ 33.895815] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 33.935460] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 34.231844] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 34.240396] IP: [] l2tp_session_create+0x948/0x1030 [ 34.247079] PGD 1ca913067 PUD 1d8194067 PMD 0 [ 34.252000] Oops: 0002 [#1] PREEMPT SMP KASAN [ 34.256974] Dumping ftrace buffer: [ 34.260486] (ftrace buffer empty) [ 34.264174] Modules linked in: [ 34.267462] CPU: 0 PID: 4158 Comm: syz-executor0 Not tainted 4.4.151-g3a2ec58 #22 [ 34.275054] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.284383] task: ffff8800b995b000 task.stack: ffff8801d81e8000 [ 34.290416] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 34.299658] RSP: 0018:ffff8801d81efad0 EFLAGS: 00010246 [ 34.305089] RAX: 0000000000000000 RBX: ffff8800afebc000 RCX: 0000000000000006 [ 34.312427] RDX: 1ffff10015fd7830 RSI: ffffffff835a4633 RDI: ffff8800afebc180 [ 34.319679] RBP: ffff8801d81efb40 R08: ffff8800b995b900 R09: 0000000000000000 [ 34.326928] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d8282328 [ 34.334176] R13: ffff8801d81efc58 R14: ffff8801d8282280 R15: ffffffff835a3260 [ 34.341427] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f770db40 [ 34.349628] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 34.355593] CR2: 0000000000000080 CR3: 00000001d8309000 CR4: 00000000001606f0 [ 34.362861] Stack: [ 34.365031] ffffffff81140a6a ffff8800afebc020 ffff8801d82823d8 ffff8801d8282290 [ 34.373115] ffffffff838cbb80 ffff8801d8282330 ffff8801d82823d0 ffff8800afebc0e0 [ 34.381109] ffffffff00000000 ffff8801d7963300 0000000000000000 ffff8801d7963330 [ 34.389108] Call Trace: [ 34.391675] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 34.398026] [] ? _raw_read_unlock_bh+0x30/0x40 [ 34.404237] [] pppol2tp_connect+0x10f0/0x1910 [ 34.410471] [] ? pppol2tp_recv+0x320/0x320 [ 34.416336] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 34.423155] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 34.429720] [] ? retint_kernel+0x2d/0x2d [ 34.435413] [] ? security_socket_connect+0x8f/0xc0 [ 34.441971] [] SYSC_connect+0x1b8/0x300 [ 34.447571] [] ? SYSC_perf_event_open+0x211/0x2470 [ 34.454129] [] ? SYSC_bind+0x280/0x280 [ 34.459654] [] ? retint_kernel+0x2d/0x2d [ 34.465339] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 34.472328] [] ? retint_kernel+0x2d/0x2d [ 34.478015] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 34.485024] [] SyS_connect+0x24/0x30 [ 34.490377] [] ? SyS_accept+0x30/0x30 [ 34.495809] [] do_fast_syscall_32+0x324/0x8b0 [ 34.501936] [] sysenter_flags_fixed+0xd/0x1a [ 34.507966] 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 [ 34.535050] RIP [] l2tp_session_create+0x948/0x1030 [ 34.541847] RSP [ 34.545452] CR2: 0000000000000080 [ 34.550217] ---[ end trace c55c6bbbf34519c4 ]--- [ 34.555082] Kernel panic - not syncing: Fatal exception [ 34.560766] Dumping ftrace buffer: [ 34.564283] (ftrace buffer empty) [ 34.567972] Kernel Offset: disabled [ 34.571587] Rebooting in 86400 seconds..