[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.313532] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.157165] random: sshd: uninitialized urandom read (32 bytes read) [ 23.578620] random: sshd: uninitialized urandom read (32 bytes read) [ 24.032375] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 29.666545] urandom_read: 1 callbacks suppressed [ 29.666548] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 06:11:16 parsed 1 programs [ 30.958616] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 06:11:18 executed programs: 0 [ 31.850729] IPVS: Creating netns size=2536 id=1 [ 31.964287] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 31.976268] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 32.016852] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 32.028076] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 32.068851] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 32.079868] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 32.091398] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 32.111495] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 32.563022] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 32.587011] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 32.593098] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 32.600557] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 32.789497] hrtimer: interrupt took 15158 ns [ 33.437486] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 33.828237] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 33.836561] IP: [] l2tp_session_create+0xc60/0x16f0 [ 33.843246] PGD 1ce250067 [ 33.845896] PUD 1cd775067 PMD 0 [ 33.849391] [ 33.851019] Oops: 0002 [#1] PREEMPT SMP KASAN [ 33.855487] Dumping ftrace buffer: [ 33.859005] (ftrace buffer empty) [ 33.862763] Modules linked in: [ 33.866071] CPU: 0 PID: 4704 Comm: syz-executor0 Not tainted 4.9.122-g54068d6 #30 [ 33.873667] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.883001] task: ffff8801cdf91800 task.stack: ffff8801d52c8000 [ 33.889033] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 33.898622] RSP: 0018:ffff8801d52cfab0 EFLAGS: 00010246 [ 33.904047] RAX: 0000000000000000 RBX: ffff8801cd6cf900 RCX: 1ffff10039bf241d [ 33.911380] RDX: 1ffff10039ad9fa0 RSI: ffff8801cdf920c8 RDI: ffff8801cd6cfd00 [ 33.918639] RBP: ffff8801d52cfb50 R08: ffff8801cdf920e8 R09: 0000000000000000 [ 33.925965] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801cd6cfbd8 [ 33.933218] R13: 0000000000000000 R14: ffff8801cd6cfb80 R15: ffff8801d52cfc68 [ 33.940464] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f770ab40 [ 33.948664] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.954524] CR2: 0000000000000080 CR3: 00000001ce12c000 CR4: 00000000001606f0 [ 33.961778] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.969028] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.976274] Stack: [ 33.978407] 0000000000000201 ffffffff836c9151 ffff8801d52cfad0 ffffffff81237ecd [ 33.986668] ffff8801cd6cfb80 ffff8801cd6cfa58 ffff8801cd6cfbd8 ffff8801cd6cfa50 [ 33.994677] ffff8801cd6cf9b0 ffff8801cd6cfba0 0000000000000000 0000000000000000 [ 34.002673] Call Trace: [ 34.005243] [] ? l2tp_session_get+0x1d1/0x790 [ 34.011364] [] ? trace_hardirqs_on+0xd/0x10 [ 34.017320] [] pppol2tp_connect+0x10d7/0x18f0 [ 34.023448] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 34.029660] [] ? security_socket_connect+0x8f/0xc0 [ 34.036218] [] SYSC_connect+0x1b8/0x300 [ 34.041815] [] ? SYSC_bind+0x280/0x280 [ 34.047328] [] ? retint_kernel+0x2d/0x2d [ 34.053014] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 34.059829] [] ? check_preemption_disabled+0x3b/0x170 [ 34.066643] [] ? retint_kernel+0x2d/0x2d [ 34.072333] [] SyS_connect+0x24/0x30 [ 34.077686] [] ? SyS_accept+0x30/0x30 [ 34.083109] [] do_fast_syscall_32+0x2f7/0x870 [ 34.089226] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.095865] [] entry_SYSENTER_compat+0x90/0xa2 [ 34.102069] 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 [ 34.129005] RIP [] l2tp_session_create+0xc60/0x16f0 [ 34.135772] RSP [ 34.139372] CR2: 0000000000000080 [ 34.143927] ---[ end trace ed2cb3226db3a653 ]--- [ 34.148698] Kernel panic - not syncing: Fatal exception [ 34.154525] Dumping ftrace buffer: [ 34.158047] (ftrace buffer empty) [ 34.161730] Kernel Offset: disabled [ 34.165330] Rebooting in 86400 seconds..