[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.774913] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.919500] random: sshd: uninitialized urandom read (32 bytes read) [ 25.362593] random: sshd: uninitialized urandom read (32 bytes read) [ 25.839952] random: sshd: uninitialized urandom read (32 bytes read) [ 101.233068] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 106.775536] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 22:49:56 parsed 1 programs [ 107.848674] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 22:49:58 executed programs: 0 [ 109.345810] IPVS: Creating netns size=2536 id=1 [ 109.471090] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 109.482401] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 109.524542] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 109.535506] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 109.578684] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 109.589754] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 109.601716] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 109.622255] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 110.113875] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 110.139210] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 110.145366] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 110.152643] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 110.372942] hrtimer: interrupt took 16185 ns [ 110.378124] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 110.386453] IP: [] l2tp_session_create+0xc60/0x16f0 [ 110.393380] PGD 1d4b8a067 [ 110.396025] PUD 1d488e067 PMD 0 [ 110.399511] [ 110.401139] Oops: 0002 [#1] PREEMPT SMP KASAN [ 110.405633] Dumping ftrace buffer: [ 110.409171] (ftrace buffer empty) [ 110.412863] Modules linked in: [ 110.416157] CPU: 0 PID: 4248 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #27 [ 110.423866] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 110.433357] task: ffff8801d554b000 task.stack: ffff8801d45a8000 [ 110.439394] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 110.448503] RSP: 0018:ffff8801d45afac0 EFLAGS: 00010246 [ 110.453958] RAX: 0000000000000000 RBX: ffff8801d4aa7400 RCX: 1ffff1003aaa971d [ 110.461210] RDX: 1ffff1003a954e10 RSI: ffff8801d554b8c8 RDI: ffff8801d4aa7080 [ 110.468458] RBP: ffff8801d45afb60 R08: ffff8801d554b8e8 R09: 0000000000000000 [ 110.475704] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d4aa6f58 [ 110.482953] R13: 0000000000000000 R14: ffff8801d4aa6f00 R15: ffff8801d45afc78 [ 110.490306] FS: 00007f9e1e3c1700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 110.498505] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 110.504361] CR2: 0000000000000080 CR3: 00000001d909e000 CR4: 00000000001606f0 [ 110.511620] Stack: [ 110.513747] 0000000000000201 ffffffff836ca141 ffff8801d45afae0 ffffffff81237f0d [ 110.521839] ffff8801d4aa6f00 ffff8801d4aa7558 ffff8801d4aa6f58 ffff8801d4aa7550 [ 110.529942] ffff8801d4aa74b0 ffff8801d4aa6f20 0000000000000000 0000000000000000 [ 110.538007] Call Trace: [ 110.540578] [] ? l2tp_session_get+0x1d1/0x790 [ 110.546698] [] ? trace_hardirqs_on+0xd/0x10 [ 110.552643] [] pppol2tp_connect+0x10d7/0x18f0 [ 110.558765] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 110.564986] [] ? security_socket_connect+0x8f/0xc0 [ 110.571545] [] SYSC_connect+0x1b8/0x300 [ 110.577145] [] ? retint_kernel+0x2d/0x2d [ 110.582837] [] ? SYSC_bind+0x280/0x280 [ 110.588359] [] ? do_futex+0x17c0/0x17c0 [ 110.593967] [] ? retint_kernel+0x2d/0x2d [ 110.599657] [] SyS_connect+0x24/0x30 [ 110.604995] [] ? SyS_accept+0x30/0x30 [ 110.610423] [] do_syscall_64+0x1a6/0x490 [ 110.616151] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 110.623057] 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 [ 110.650212] RIP [] l2tp_session_create+0xc60/0x16f0 [ 110.656987] RSP [ 110.660623] CR2: 0000000000000080 [ 110.664696] ---[ end trace c6533dcd386076da ]--- [ 110.669553] Kernel panic - not syncing: Fatal exception [ 110.675154] Dumping ftrace buffer: [ 110.678673] (ftrace buffer empty) [ 110.682362] Kernel Offset: disabled [ 110.685981] Rebooting in 86400 seconds..