[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.470364] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.746872] random: sshd: uninitialized urandom read (32 bytes read) [ 15.001200] random: sshd: uninitialized urandom read (32 bytes read) [ 15.475755] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. [ 21.143201] urandom_read: 1 callbacks suppressed [ 21.143204] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 05:57:57 parsed 1 programs [ 22.245004] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 05:57:59 executed programs: 0 [ 23.210769] IPVS: Creating netns size=2536 id=1 [ 23.324785] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 23.335967] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 23.376363] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 23.387664] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 23.427317] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 23.438767] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 23.450397] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 23.471073] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 23.920132] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 23.943648] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 23.949776] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 23.956465] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 24.152215] hrtimer: interrupt took 21568 ns [ 24.563454] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 24.677047] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 24.685300] IP: [] l2tp_session_create+0xc60/0x16f0 [ 24.692035] PGD 1d3a80067 [ 24.694685] PUD 1d3d85067 PMD 0 [ 24.698222] [ 24.699865] Oops: 0002 [#1] PREEMPT SMP KASAN [ 24.704333] Dumping ftrace buffer: [ 24.707899] (ftrace buffer empty) [ 24.711591] Modules linked in: [ 24.714882] CPU: 0 PID: 4395 Comm: syz-executor0 Not tainted 4.9.122-g54068d6 #26 [ 24.722472] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.731807] task: ffff8801d4628000 task.stack: ffff8801d5290000 [ 24.737836] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 24.746943] RSP: 0018:ffff8801d5297ac0 EFLAGS: 00010246 [ 24.752363] RAX: 0000000000000000 RBX: ffff8801d3c29680 RCX: 1ffff1003a8c511d [ 24.759611] RDX: 1ffff1003b0ca260 RSI: ffff8801d46288c8 RDI: ffff8801d8651300 [ 24.766856] RBP: ffff8801d5297b60 R08: ffff8801d46288e8 R09: 0000000000000000 [ 24.774105] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d86511d8 [ 24.781351] R13: 0000000000000000 R14: ffff8801d8651180 R15: ffff8801d5297c78 [ 24.788601] FS: 00007f0d2f07a700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 24.796807] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.802664] CR2: 0000000000000080 CR3: 00000001d41b9000 CR4: 00000000001606f0 [ 24.809911] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 24.817156] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 24.824398] Stack: [ 24.826523] 0000000000000201 ffffffff836c9151 ffff8801d5297ae0 ffffffff81237ecd [ 24.834511] ffff8801d8651180 ffff8801d3c297d8 ffff8801d86511d8 ffff8801d3c297d0 [ 24.842508] ffff8801d3c29730 ffff8801d86511a0 0000000000000000 0000000000000000 [ 24.850510] Call Trace: [ 24.853076] [] ? l2tp_session_get+0x1d1/0x790 [ 24.859198] [] ? trace_hardirqs_on+0xd/0x10 [ 24.865143] [] pppol2tp_connect+0x10d7/0x18f0 [ 24.871265] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 24.877477] [] ? security_socket_connect+0x8f/0xc0 [ 24.884034] [] SYSC_connect+0x1b8/0x300 [ 24.889639] [] ? SYSC_bind+0x280/0x280 [ 24.895153] [] ? retint_kernel+0x2d/0x2d [ 24.900840] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 24.907655] [] ? check_preemption_disabled+0x3b/0x170 [ 24.914463] [] ? retint_kernel+0x2d/0x2d [ 24.920146] [] SyS_connect+0x24/0x30 [ 24.925479] [] ? SyS_accept+0x30/0x30 [ 24.930901] [] do_syscall_64+0x1a6/0x490 [ 24.936583] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.943479] 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 [ 24.970509] RIP [] l2tp_session_create+0xc60/0x16f0 [ 24.977270] RSP [ 24.980872] CR2: 0000000000000080 [ 24.984815] ---[ end trace 1185f62265b373e0 ]--- [ 24.989765] Kernel panic - not syncing: Fatal exception [ 24.995479] Dumping ftrace buffer: [ 24.998990] (ftrace buffer empty) [ 25.002675] Kernel Offset: disabled [ 25.006275] Rebooting in 86400 seconds..