[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.587052] 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: [ 19.448284] random: sshd: uninitialized urandom read (32 bytes read) [ 19.825042] random: sshd: uninitialized urandom read (32 bytes read) [ 20.340290] random: sshd: uninitialized urandom read (32 bytes read) [ 29.096255] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.34' (ECDSA) to the list of known hosts. [ 34.601138] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 22:46:50 parsed 1 programs [ 36.125727] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 22:46:52 executed programs: 0 [ 37.388060] IPVS: Creating netns size=2536 id=1 [ 37.511993] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 37.523564] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 37.565567] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 37.576888] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 37.620361] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 37.631693] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 37.644321] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 37.665895] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 37.808207] ip (3967) used greatest stack depth: 23976 bytes left [ 38.175653] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 38.201849] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 38.208018] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 38.214711] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 38.411802] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 38.420176] IP: [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0 [ 38.426879] PGD 1d713f067 [ 38.429519] PUD 1d98ab067 PMD 0 [ 38.432991] [ 38.434616] Oops: 0002 [#1] PREEMPT SMP KASAN [ 38.439081] Dumping ftrace buffer: [ 38.442591] (ftrace buffer empty) [ 38.446356] Modules linked in: [ 38.449686] CPU: 1 PID: 4207 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31 [ 38.457343] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.466678] task: ffff8801d5ee3000 task.stack: ffff8801d69b0000 [ 38.472808] RIP: 0010:[<ffffffff836c8e30>] [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0 [ 38.481947] RSP: 0018:ffff8801d69b7ab0 EFLAGS: 00010246 [ 38.487370] RAX: 0000000000000000 RBX: ffff8801da266000 RCX: 1ffff1003abdc71d [ 38.494614] RDX: 1ffff1003adc4b50 RSI: ffff8801d5ee38c8 RDI: ffff8801d6e25a80 [ 38.501858] RBP: ffff8801d69b7b50 R08: ffff8801d5ee38e8 R09: 0000000000000000 [ 38.509101] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d6e25958 [ 38.516352] R13: 0000000000000000 R14: ffff8801d6e25900 R15: ffff8801d69b7c68 [ 38.523675] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7776b40 [ 38.531881] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 38.537737] CR2: 0000000000000080 CR3: 00000001da2bd000 CR4: 00000000001606f0 [ 38.544983] Stack: [ 38.547130] 0000000000000201 ffffffff836ca141 ffff8801d69b7ad0 ffffffff81237f0d [ 38.555186] ffff8801d6e25900 ffff8801da266158 ffff8801d6e25958 ffff8801da266150 [ 38.563189] ffff8801da2660b0 ffff8801d6e25920 0000000000000000 0000000000000000 [ 38.571228] Call Trace: [ 38.573794] [<ffffffff836ca141>] ? l2tp_session_get+0x1d1/0x790 [ 38.579915] [<ffffffff81237f0d>] ? trace_hardirqs_on+0xd/0x10 [ 38.585939] [<ffffffff836cdfe7>] pppol2tp_connect+0x10d7/0x18f0 [ 38.592067] [<ffffffff836ccf10>] ? pppol2tp_seq_show+0xc30/0xc30 [ 38.598313] [<ffffffff81cf90cf>] ? security_socket_connect+0x8f/0xc0 [ 38.604895] [<ffffffff8301e958>] SYSC_connect+0x1b8/0x300 [ 38.610501] [<ffffffff81238470>] ? debug_check_no_locks_freed+0x210/0x210 [ 38.617549] [<ffffffff8301e7a0>] ? SYSC_bind+0x280/0x280 [ 38.623201] [<ffffffff815dbcb0>] ? get_unused_fd_flags+0xd0/0xd0 [ 38.629429] [<ffffffff812dc050>] ? compat_SyS_get_robust_list+0x310/0x310 [ 38.636425] [<ffffffff815dd57f>] ? SyS_dup2+0x41f/0x5e0 [ 38.641862] [<ffffffff83021224>] SyS_connect+0x24/0x30 [ 38.647206] [<ffffffff83021200>] ? SyS_accept+0x30/0x30 [ 38.652639] [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870 [ 38.658762] [<ffffffff81003036>] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.665409] [<ffffffff83a03390>] entry_SYSENTER_compat+0x90/0xa2 [ 38.671681] 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 [ 38.698925] RIP [<ffffffff836c8e30>] l2tp_session_create+0xc60/0x16f0 [ 38.705742] RSP <ffff8801d69b7ab0> [ 38.709346] CR2: 0000000000000080 [ 38.714493] ---[ end trace 8fa50bc58ba96876 ]--- [ 38.719517] Kernel panic - not syncing: Fatal exception [ 38.725159] Dumping ftrace buffer: [ 38.728686] (ftrace buffer empty) [ 38.732372] Kernel Offset: disabled [ 38.735974] Rebooting in 86400 seconds..