[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.420662] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.368000] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.783014] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.425871] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) [ 46.699978] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.0.50' (ECDSA) to the list of known hosts. [ 52.246360] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) 2018/08/25 08:40:07 parsed 1 programs [ 53.753141] random: cc1: uninitialized urandom read (8 bytes read, 77 bits of entropy available) 2018/08/25 08:40:10 executed programs: 0 [ 54.938293] IPVS: Creating netns size=2552 id=1 [ 55.177054] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 55.191348] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 55.272091] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 55.286874] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 55.367440] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 55.383508] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 55.401347] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 55.416924] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 55.458902] ip (3977) used greatest stack depth: 23520 bytes left [ 56.140810] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 56.179461] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 56.458482] hrtimer: interrupt took 19906 ns [ 57.501269] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 57.509504] IP: [] l2tp_session_create+0x948/0x1030 [ 57.516187] PGD 1d29c7067 PUD 1da176067 PMD 0 [ 57.521122] Oops: 0002 [#1] PREEMPT SMP KASAN [ 57.526079] Dumping ftrace buffer: [ 57.529592] (ftrace buffer empty) [ 57.533277] Modules linked in: [ 57.536566] CPU: 0 PID: 4511 Comm: syz-executor0 Not tainted 4.4.152-ge5c5f1f #25 [ 57.544157] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.553486] task: ffff8800b689c800 task.stack: ffff8801c7500000 [ 57.559516] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 57.568630] RSP: 0018:ffff8801c7507ad0 EFLAGS: 00010246 [ 57.574067] RAX: 0000000000000000 RBX: ffff8800b8ca3400 RCX: 0000000000000006 [ 57.581321] RDX: 1ffff100171946b0 RSI: ffffffff835a4993 RDI: ffff8800b8ca3580 [ 57.588566] RBP: ffff8801c7507b40 R08: 000000000000000a R09: 000000000000ffff [ 57.595811] R10: ffffed003a85de98 R11: ffffffff8463a140 R12: ffff8801d42ef4a8 [ 57.603057] R13: ffff8801c7507c58 R14: ffff8801d42ef400 R15: ffffffff835a35c0 [ 57.610300] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7718b40 [ 57.618757] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 57.624615] CR2: 0000000000000080 CR3: 00000001d491b000 CR4: 00000000001606f0 [ 57.631861] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 57.639126] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 57.646368] Stack: [ 57.648491] ffffffff81140a6a ffff8800b8ca3420 ffff8801d42ef558 ffff8801d42ef410 [ 57.656489] ffffffff838cbee0 ffff8801d42ef4b0 ffff8801d42ef550 ffff8800b8ca34e0 [ 57.664477] ffffffff00000000 ffff8801c7460000 0000000000000000 ffff8801c7460030 [ 57.672499] Call Trace: [ 57.675068] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 57.681365] [] ? _raw_read_unlock_bh+0x30/0x40 [ 57.687575] [] pppol2tp_connect+0x10f0/0x1910 [ 57.693693] [] ? pppol2tp_recv+0x320/0x320 [ 57.699568] [] ? security_socket_connect+0x8f/0xc0 [ 57.706124] [] SYSC_connect+0x1b8/0x300 [ 57.711734] [] ? SYSC_bind+0x280/0x280 [ 57.717250] [] ? get_unused_fd_flags+0xd0/0xd0 [ 57.723460] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 57.730451] [] ? SyS_socket+0x121/0x1b0 [ 57.736052] [] ? move_addr_to_kernel+0x50/0x50 [ 57.742259] [] SyS_connect+0x24/0x30 [ 57.747599] [] ? SyS_accept+0x30/0x30 [ 57.753025] [] do_fast_syscall_32+0x324/0x8b0 [ 57.759146] [] sysenter_flags_fixed+0xd/0x1a [ 57.765177] 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 [ 57.792144] RIP [] l2tp_session_create+0x948/0x1030 [ 57.798907] RSP [ 57.802506] CR2: 0000000000000080 [ 57.807022] ---[ end trace 8df3bd8cc2fdd342 ]--- [ 57.811776] Kernel panic - not syncing: Fatal exception [ 57.817493] Dumping ftrace buffer: [ 57.821019] (ftrace buffer empty) [ 57.824707] Kernel Offset: disabled [ 57.828310] Rebooting in 86400 seconds..