[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.698917] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.162398] random: sshd: uninitialized urandom read (32 bytes read) [ 25.526808] random: sshd: uninitialized urandom read (32 bytes read) [ 25.899941] random: sshd: uninitialized urandom read (32 bytes read) [ 45.211075] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts. [ 50.788255] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 05:18:16 parsed 1 programs [ 52.342750] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 05:18:18 executed programs: 0 [ 53.440979] IPVS: Creating netns size=2536 id=1 [ 53.569467] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 53.581291] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 53.626584] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 53.638196] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 53.682184] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 53.693705] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 53.705928] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 53.726856] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 53.754268] ip (3929) used greatest stack depth: 24136 bytes left [ 54.240353] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 54.266646] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 54.273029] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 54.279778] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 54.495031] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 54.524978] hrtimer: interrupt took 11491 ns [ 54.568633] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 55.036723] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 55.603481] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 55.611728] IP: [<ffffffff836c7e40>] l2tp_session_create+0xc60/0x16f0 [ 55.618442] PGD 1cd3fe067 [ 55.621114] PUD 1cbbfe067 PMD 0 [ 55.624622] [ 55.626287] Oops: 0002 [#1] PREEMPT SMP KASAN [ 55.630765] Dumping ftrace buffer: [ 55.634285] (ftrace buffer empty) [ 55.637978] Modules linked in: [ 55.641279] CPU: 0 PID: 4838 Comm: syz-executor0 Not tainted 4.9.122-g54068d6 #30 [ 55.648968] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.658316] task: ffff8801cac58000 task.stack: ffff8801cba20000 [ 55.664353] RIP: 0010:[<ffffffff836c7e40>] [<ffffffff836c7e40>] l2tp_session_create+0xc60/0x16f0 [ 55.673483] RSP: 0018:ffff8801cba27ab0 EFLAGS: 00010246 [ 55.678913] RAX: 0000000000000000 RBX: ffff8801cb75ef00 RCX: 1ffff1003958b11d [ 55.686181] RDX: 1ffff100396ebd20 RSI: ffff8801cac588c8 RDI: ffff8801cb75e900 [ 55.693439] RBP: ffff8801cba27b50 R08: ffff8801cac588e8 R09: 0000000000000000 [ 55.700689] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801cb75e7d8 [ 55.707940] R13: 0000000000000000 R14: ffff8801cb75e780 R15: ffff8801cba27c68 [ 55.715193] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f771cb40 [ 55.723403] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 55.729267] CR2: 0000000000000080 CR3: 00000001cbb66000 CR4: 00000000001606f0 [ 55.736521] Stack: [ 55.738657] 0000000000000201 ffffffff836c9151 ffff8801cba27ad0 ffffffff81237ecd [ 55.746710] ffff8801cb75e780 ffff8801cb75f058 ffff8801cb75e7d8 ffff8801cb75f050 [ 55.754714] ffff8801cb75efb0 ffff8801cb75e7a0 0000000000000000 0000000000000000 [ 55.762760] Call Trace: [ 55.765341] [<ffffffff836c9151>] ? l2tp_session_get+0x1d1/0x790 [ 55.771477] [<ffffffff81237ecd>] ? trace_hardirqs_on+0xd/0x10 [ 55.777443] [<ffffffff836ccff7>] pppol2tp_connect+0x10d7/0x18f0 [ 55.783571] [<ffffffff836cbf20>] ? pppol2tp_seq_show+0xc30/0xc30 [ 55.789790] [<ffffffff81cf826f>] ? security_socket_connect+0x8f/0xc0 [ 55.796355] [<ffffffff8301d958>] SYSC_connect+0x1b8/0x300 [ 55.801967] [<ffffffff8301d7a0>] ? SYSC_bind+0x280/0x280 [ 55.807492] [<ffffffff812dc010>] ? compat_SyS_get_robust_list+0x310/0x310 [ 55.814492] [<ffffffff8301f830>] ? move_addr_to_kernel+0x50/0x50 [ 55.820706] [<ffffffff83020224>] SyS_connect+0x24/0x30 [ 55.826053] [<ffffffff83020200>] ? SyS_accept+0x30/0x30 [ 55.831491] [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870 [ 55.837622] [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 55.844279] [<ffffffff83a023d0>] entry_SYSENTER_compat+0x90/0xa2 [ 55.850487] 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 <f0> ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 [ 55.878283] RIP [<ffffffff836c7e40>] l2tp_session_create+0xc60/0x16f0 [ 55.885065] RSP <ffff8801cba27ab0> [ 55.888678] CR2: 0000000000000080 [ 55.896493] ---[ end trace 481359a09e14b8e1 ]--- [ 55.901364] Kernel panic - not syncing: Fatal exception [ 55.907033] Dumping ftrace buffer: [ 55.910552] (ftrace buffer empty) [ 55.914237] Kernel Offset: disabled [ 55.917838] Rebooting in 86400 seconds..