[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.127053] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.882023] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 29.294847] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 30.109189] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) [ 46.197111] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) Warning: Permanently added '10.128.10.32' (ECDSA) to the list of known hosts. [ 51.850489] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) 2018/08/22 23:03:56 parsed 1 programs [ 53.376322] random: cc1: uninitialized urandom read (8 bytes read, 89 bits of entropy available) 2018/08/22 23:03:59 executed programs: 0 [ 54.754327] IPVS: Creating netns size=2552 id=1 [ 55.011364] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 55.027035] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 55.112162] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 55.128126] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 55.216651] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 55.231503] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 55.248351] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 55.266545] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 56.030769] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 56.071678] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 56.589210] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 56.597544] IP: [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 56.604227] PGD b0eec067 PUD b9c67067 PMD 0 [ 56.608980] Oops: 0002 [#1] PREEMPT SMP KASAN [ 56.614058] Dumping ftrace buffer: [ 56.617575] (ftrace buffer empty) [ 56.621308] Modules linked in: [ 56.624609] CPU: 0 PID: 4198 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20 [ 56.632209] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.641538] task: ffff8801d7976000 task.stack: ffff8800b98d8000 [ 56.647569] RIP: 0010:[<ffffffff835aa438>] [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 56.656691] RSP: 0018:ffff8800b98dfad0 EFLAGS: 00010246 [ 56.662117] RAX: 0000000000000000 RBX: ffff8801da33c500 RCX: 0000000000000006 [ 56.669363] RDX: 1ffff1003b4678d0 RSI: ffffffff835a4543 RDI: ffff8801da33c680 [ 56.676609] RBP: ffff8800b98dfb40 R08: ffff8801d7976900 R09: 0000000000000000 [ 56.683901] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801da33c0a8 [ 56.691154] R13: ffff8800b98dfc58 R14: ffff8801da33c000 R15: ffffffff835a3170 [ 56.698401] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f771db40 [ 56.706606] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 56.712468] CR2: 0000000000000080 CR3: 00000000b9a3e000 CR4: 00000000001606f0 [ 56.719718] Stack: [ 56.721843] ffffffff81140a6a ffff8801da33c520 ffff8801da33c158 ffff8801da33c010 [ 56.729891] ffffffff838cba90 ffff8801da33c0b0 ffff8801da33c150 ffff8801da33c5e0 [ 56.737884] ffffffff00000000 ffff8801d71fdd80 0000000000000000 ffff8801d71fddb0 [ 56.745894] Call Trace: [ 56.748475] [<ffffffff81140a6a>] ? __local_bh_enable_ip+0x6a/0xd0 [ 56.754778] [<ffffffff838cba90>] ? _raw_read_unlock_bh+0x30/0x40 [ 56.760988] [<ffffffff835ae830>] pppol2tp_connect+0x10f0/0x1910 [ 56.767109] [<ffffffff835ad740>] ? pppol2tp_recv+0x320/0x320 [ 56.772972] [<ffffffff81c5700f>] ? security_socket_connect+0x8f/0xc0 [ 56.779529] [<ffffffff82f27758>] SYSC_connect+0x1b8/0x300 [ 56.785137] [<ffffffff82f275a0>] ? SYSC_bind+0x280/0x280 [ 56.790650] [<ffffffff8157fdd0>] ? get_unused_fd_flags+0xd0/0xd0 [ 56.796863] [<ffffffff812d59b0>] ? compat_SyS_get_robust_list+0x310/0x310 [ 56.803852] [<ffffffff815816f5>] ? SyS_dup2+0x3c5/0x5e0 [ 56.809281] [<ffffffff82f2a094>] SyS_connect+0x24/0x30 [ 56.814623] [<ffffffff82f2a070>] ? SyS_accept+0x30/0x30 [ 56.820054] [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 [ 56.826180] [<ffffffff838cda83>] sysenter_flags_fixed+0xd/0x1a [ 56.832210] 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 <f0> ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 f1 13 [ 56.859262] RIP [<ffffffff835aa438>] l2tp_session_create+0x948/0x1030 [ 56.866030] RSP <ffff8800b98dfad0> [ 56.869628] CR2: 0000000000000080 [ 56.874622] ---[ end trace 7f184b4b716bc6a2 ]--- [ 56.879369] Kernel panic - not syncing: Fatal exception [ 56.884982] Dumping ftrace buffer: [ 56.888499] (ftrace buffer empty) [ 56.892189] Kernel Offset: disabled [ 56.895794] Rebooting in 86400 seconds..