[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.360325] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.871371] random: sshd: uninitialized urandom read (32 bytes read) [ 20.334944] random: sshd: uninitialized urandom read (32 bytes read) [ 20.849183] random: sshd: uninitialized urandom read (32 bytes read) [ 20.991461] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.25' (ECDSA) to the list of known hosts. [ 26.584584] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 23:04:50 parsed 1 programs [ 28.156231] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 23:04:53 executed programs: 0 [ 29.353182] IPVS: Creating netns size=2536 id=1 [ 29.475428] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 29.486955] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 29.530101] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 29.541309] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 29.584452] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 29.595593] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 29.608784] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 29.622150] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 29.666106] ip (3916) used greatest stack depth: 23976 bytes left [ 30.118495] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 30.143273] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 30.149578] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 30.156261] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 30.349493] hrtimer: interrupt took 24007 ns [ 30.742391] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 30.750621] IP: [] l2tp_session_create+0xc60/0x16f0 [ 30.757308] PGD 1d0860067 [ 30.759944] PUD 1d3cbd067 PMD 0 [ 30.763429] [ 30.765045] Oops: 0002 [#1] PREEMPT SMP KASAN [ 30.769507] Dumping ftrace buffer: [ 30.773014] (ftrace buffer empty) [ 30.776696] Modules linked in: [ 30.779976] CPU: 0 PID: 4438 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31 [ 30.787563] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.796887] task: ffff8801d31dc800 task.stack: ffff8801d5630000 [ 30.802912] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 30.812009] RSP: 0018:ffff8801d5637ab0 EFLAGS: 00010246 [ 30.817423] RAX: 0000000000000000 RBX: ffff8801d60ca000 RCX: 1ffff1003a63ba1d [ 30.824667] RDX: 1ffff1003ac197a0 RSI: ffff8801d31dd0c8 RDI: ffff8801d60cbd00 [ 30.831910] RBP: ffff8801d5637b50 R08: ffff8801d31dd0e8 R09: 0000000000000000 [ 30.839149] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d60cbbd8 [ 30.846420] R13: 0000000000000000 R14: ffff8801d60cbb80 R15: ffff8801d5637c68 [ 30.853735] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f77abb40 [ 30.861937] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 30.867787] CR2: 0000000000000080 CR3: 00000001d30ba000 CR4: 00000000001606f0 [ 30.875028] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.882266] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.889509] Stack: [ 30.891646] 0000000000000201 ffffffff836ca141 ffff8801d5637ad0 ffffffff81237f0d [ 30.899623] ffff8801d60cbb80 ffff8801d60ca158 ffff8801d60cbbd8 ffff8801d60ca150 [ 30.907587] ffff8801d60ca0b0 ffff8801d60cbba0 0000000000000000 0000000000000000 [ 30.915559] Call Trace: [ 30.918129] [] ? l2tp_session_get+0x1d1/0x790 [ 30.924246] [] ? trace_hardirqs_on+0xd/0x10 [ 30.930184] [] pppol2tp_connect+0x10d7/0x18f0 [ 30.936298] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 30.942510] [] ? check_preemption_disabled+0x3b/0x170 [ 30.949319] [] ? retint_kernel+0x2d/0x2d [ 30.955022] [] ? security_socket_connect+0x8f/0xc0 [ 30.961589] [] SYSC_connect+0x1b8/0x300 [ 30.967179] [] ? SYSC_bind+0x280/0x280 [ 30.972688] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 30.979673] [] ? retint_kernel+0x2d/0x2d [ 30.985352] [] SyS_connect+0x24/0x30 [ 30.990685] [] ? SyS_accept+0x30/0x30 [ 30.996106] [] do_fast_syscall_32+0x2f7/0x870 [ 31.002225] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.008862] [] entry_SYSENTER_compat+0x90/0xa2 [ 31.015245] 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 [ 31.042202] RIP [] l2tp_session_create+0xc60/0x16f0 [ 31.048965] RSP [ 31.052559] CR2: 0000000000000080 [ 31.057746] ---[ end trace 0a8dd8f9d92fa936 ]--- [ 31.062511] Kernel panic - not syncing: Fatal exception [ 31.068162] Dumping ftrace buffer: [ 31.071675] (ftrace buffer empty) [ 31.075359] Kernel Offset: disabled [ 31.078954] Rebooting in 86400 seconds..