[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.871477] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.793776] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.325701] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.039777] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) [ 27.218179] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. [ 32.707453] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) 2018/08/22 21:07:49 parsed 1 programs [ 34.056710] random: cc1: uninitialized urandom read (8 bytes read, 83 bits of entropy available) 2018/08/22 21:07:51 executed programs: 0 [ 35.692191] IPVS: Creating netns size=2552 id=1 [ 35.945602] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 35.962153] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 36.050717] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 36.065145] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 36.149968] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 36.165507] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 36.182912] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 36.200582] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 36.950121] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 36.990235] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 37.299467] hrtimer: interrupt took 25867 ns [ 37.307978] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 37.316178] IP: [] l2tp_session_create+0x948/0x1030 [ 37.322876] PGD b1829067 PUD b2b10067 PMD 0 [ 37.327640] Oops: 0002 [#1] PREEMPT SMP KASAN [ 37.332600] Dumping ftrace buffer: [ 37.336116] (ftrace buffer empty) [ 37.339809] Modules linked in: [ 37.343113] CPU: 0 PID: 4234 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 37.350706] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.360037] task: ffff8801d6e14800 task.stack: ffff8800b94c0000 [ 37.366073] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 37.375202] RSP: 0018:ffff8800b94c7b48 EFLAGS: 00010246 [ 37.380644] RAX: 0000000000000000 RBX: ffff8800b559af00 RCX: 0000000000000006 [ 37.388170] RDX: 1ffff10016ab3610 RSI: ffffffff835a4543 RDI: ffff8800b559b080 [ 37.395487] RBP: ffff8800b94c7bb8 R08: ffff8801d6e15100 R09: 0000000000000000 [ 37.402735] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b559b728 [ 37.410041] R13: ffff8800b94c7cd0 R14: ffff8800b559b680 R15: ffffffff835a3170 [ 37.417295] FS: 00007f37d23ed700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 37.425608] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.431464] CR2: 0000000000000080 CR3: 00000000b1858000 CR4: 00000000001606f0 [ 37.438720] Stack: [ 37.440847] ffffffff81140a6a ffff8800b559af20 ffff8800b559b7d8 ffff8800b559b690 [ 37.448852] ffffffff838cba90 ffff8800b559b730 ffff8800b559b7d0 ffff8800b559afe0 [ 37.456882] ffffffff00000000 ffff8801d796f700 0000000000000000 ffff8801d796f730 [ 37.464919] Call Trace: [ 37.467489] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 37.473789] [] ? _raw_read_unlock_bh+0x30/0x40 [ 37.480004] [] pppol2tp_connect+0x10f0/0x1910 [ 37.486294] [] ? pppol2tp_recv+0x320/0x320 [ 37.492289] [] ? lock_acquire+0x19f/0x450 [ 37.498072] [] ? security_socket_connect+0x8f/0xc0 [ 37.504637] [] SYSC_connect+0x1b8/0x300 [ 37.510240] [] ? __fd_install+0x21a/0x600 [ 37.516027] [] ? SYSC_bind+0x280/0x280 [ 37.521867] [] ? __fd_install+0x255/0x600 [ 37.527694] [] ? get_unused_fd_flags+0xd0/0xd0 [ 37.533921] [] ? do_futex+0x17f0/0x17f0 [ 37.539545] [] ? fd_install+0x4d/0x60 [ 37.544987] [] ? anon_inode_getfd+0x64/0x90 [ 37.550938] [] SyS_connect+0x24/0x30 [ 37.556289] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 37.562844] 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 [ 37.590083] RIP [] l2tp_session_create+0x948/0x1030 [ 37.596871] RSP [ 37.600471] CR2: 0000000000000080 [ 37.604641] ---[ end trace f40478479090caa6 ]--- [ 37.609397] Kernel panic - not syncing: Fatal exception [ 37.615014] Dumping ftrace buffer: [ 37.618539] (ftrace buffer empty) [ 37.622226] Kernel Offset: disabled [ 37.625828] Rebooting in 86400 seconds..