[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.423462] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.478094] random: sshd: uninitialized urandom read (32 bytes read) [ 20.025998] random: sshd: uninitialized urandom read (32 bytes read) [ 20.527884] random: sshd: uninitialized urandom read (32 bytes read) [ 20.659913] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. [ 26.392162] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 21:06:35 parsed 1 programs [ 28.022759] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 21:06:37 executed programs: 0 [ 29.123395] IPVS: Creating netns size=2536 id=1 [ 29.241788] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 29.254026] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 29.296183] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 29.307405] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 29.349152] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 29.360432] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 29.372489] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 29.392663] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 29.871549] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 29.896652] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 29.902842] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 29.910027] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 31.219602] l2tp_core: tunl 4: sockfd_lookup(fd=5) returned -9 2018/08/22 21:06:42 executed programs: 565 [ 34.890088] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 34.898321] IP: [] l2tp_session_create+0xc60/0x16f0 [ 34.905003] PGD 1b68c7067 [ 34.907644] PUD 1bcb28067 PMD 0 [ 34.911121] [ 34.912746] Oops: 0002 [#1] PREEMPT SMP KASAN [ 34.917234] Dumping ftrace buffer: [ 34.920764] (ftrace buffer empty) [ 34.924475] Modules linked in: [ 34.927782] CPU: 0 PID: 6643 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31 [ 34.935393] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.944725] task: ffff8801cd5fe000 task.stack: ffff8801cd0c8000 [ 34.950756] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 34.959880] RSP: 0018:ffff8801cd0cfab0 EFLAGS: 00010246 [ 34.965639] RAX: 0000000000000000 RBX: ffff8801cd77b400 RCX: 1ffff10039abfd1d [ 34.972883] RDX: 1ffff10039aef660 RSI: ffff8801cd5fe8c8 RDI: ffff8801cd77b300 [ 34.980128] RBP: ffff8801cd0cfb50 R08: ffff8801cd5fe8e8 R09: 0000000000000000 [ 34.987373] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801cd77b1d8 [ 34.994618] R13: 0000000000000000 R14: ffff8801cd77b180 R15: ffff8801cd0cfc68 [ 35.001865] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f77e4b40 [ 35.010071] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 35.015932] CR2: 0000000000000080 CR3: 00000001c5810000 CR4: 00000000001606f0 [ 35.023187] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 35.030437] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 35.037679] Stack: [ 35.039804] 0000000000000201 ffffffff836ca141 ffff8801cd0cfad0 ffffffff81237f0d [ 35.047803] ffff8801cd77b180 ffff8801cd77b558 ffff8801cd77b1d8 ffff8801cd77b550 [ 35.055805] ffff8801cd77b4b0 ffff8801cd77b1a0 0000000000000000 0000000000000000 [ 35.063801] Call Trace: [ 35.066368] [] ? l2tp_session_get+0x1d1/0x790 [ 35.072492] [] ? trace_hardirqs_on+0xd/0x10 [ 35.078442] [] pppol2tp_connect+0x10d7/0x18f0 [ 35.084564] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 35.090773] [] ? security_socket_connect+0x8f/0xc0 [ 35.097328] [] SYSC_connect+0x1b8/0x300 [ 35.102930] [] ? debug_check_no_locks_freed+0x210/0x210 [ 35.109925] [] ? SYSC_bind+0x280/0x280 [ 35.115444] [] ? get_unused_fd_flags+0xd0/0xd0 [ 35.121656] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 35.128645] [] ? SyS_dup2+0x41f/0x5e0 [ 35.134078] [] SyS_connect+0x24/0x30 [ 35.139417] [] ? SyS_accept+0x30/0x30 [ 35.144846] [] do_fast_syscall_32+0x2f7/0x870 [ 35.150970] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 35.157612] [] entry_SYSENTER_compat+0x90/0xa2 [ 35.163818] 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 [ 35.190875] RIP [] l2tp_session_create+0xc60/0x16f0 [ 35.197652] RSP [ 35.201253] CR2: 0000000000000080 [ 35.205274] ---[ end trace 53a3152d4ae478bc ]--- [ 35.210145] Kernel panic - not syncing: Fatal exception [ 35.215845] Dumping ftrace buffer: [ 35.219368] (ftrace buffer empty) [ 35.223053] Kernel Offset: disabled [ 35.226654] Rebooting in 86400 seconds..