[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.841281] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.392756] random: sshd: uninitialized urandom read (32 bytes read) [ 27.959892] random: sshd: uninitialized urandom read (32 bytes read) [ 28.483683] random: sshd: uninitialized urandom read (32 bytes read) [ 28.608224] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.19' (ECDSA) to the list of known hosts. [ 34.285936] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 15:02:29 parsed 1 programs [ 36.173058] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 15:02:33 executed programs: 0 [ 38.069284] IPVS: Creating netns size=2536 id=1 [ 38.193190] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 38.205162] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 38.248098] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 38.259311] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 38.303011] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 38.314683] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 38.327396] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 38.348090] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 38.847264] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 38.871949] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 38.878166] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 38.885398] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 39.101161] hrtimer: interrupt took 13661 ns [ 39.249503] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 39.424526] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 39.432856] IP: [] l2tp_session_create+0xc60/0x16f0 [ 39.439540] PGD 1d383b067 [ 39.442182] PUD 1d3ace067 PMD 0 [ 39.445656] [ 39.447274] Oops: 0002 [#1] PREEMPT SMP KASAN [ 39.451794] Dumping ftrace buffer: [ 39.455311] (ftrace buffer empty) [ 39.458993] Modules linked in: [ 39.462317] CPU: 0 PID: 4385 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31 [ 39.469911] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.479240] task: ffff8801d37e6000 task.stack: ffff8801d3208000 [ 39.485267] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 39.494380] RSP: 0018:ffff8801d320fab0 EFLAGS: 00010246 [ 39.499802] RAX: 0000000000000000 RBX: ffff8801d3761b80 RCX: 1ffff1003a6fcd1d [ 39.507046] RDX: 1ffff1003a707080 RSI: ffff8801d37e68c8 RDI: ffff8801d3838400 [ 39.514288] RBP: ffff8801d320fb50 R08: ffff8801d37e68e8 R09: 0000000000000000 [ 39.521575] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d38382d8 [ 39.528826] R13: 0000000000000000 R14: ffff8801d3838280 R15: ffff8801d320fc68 [ 39.536080] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f7752b40 [ 39.544740] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 39.550599] CR2: 0000000000000080 CR3: 00000001d319a000 CR4: 00000000001606f0 [ 39.557855] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.565106] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.572345] Stack: [ 39.574470] 0000000000000201 ffffffff836ca141 ffff8801d320fad0 ffffffff81237f0d [ 39.582502] ffff8801d3838280 ffff8801d3761cd8 ffff8801d38382d8 ffff8801d3761cd0 [ 39.590499] ffff8801d3761c30 ffff8801d38382a0 0000000000000000 0000000000000000 [ 39.598474] Call Trace: [ 39.601040] [] ? l2tp_session_get+0x1d1/0x790 [ 39.607159] [] ? trace_hardirqs_on+0xd/0x10 [ 39.613103] [] pppol2tp_connect+0x10d7/0x18f0 [ 39.619289] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 39.625505] [] ? security_socket_connect+0x8f/0xc0 [ 39.632058] [] SYSC_connect+0x1b8/0x300 [ 39.637655] [] ? SYSC_bind+0x280/0x280 [ 39.643165] [] ? check_preemption_disabled+0x3b/0x170 [ 39.649981] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 39.656967] [] ? move_addr_to_kernel+0x50/0x50 [ 39.663176] [] SyS_connect+0x24/0x30 [ 39.668514] [] ? SyS_accept+0x30/0x30 [ 39.673941] [] do_fast_syscall_32+0x2f7/0x870 [ 39.680165] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.686816] [] entry_SYSENTER_compat+0x90/0xa2 [ 39.693066] 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 [ 39.720126] RIP [] l2tp_session_create+0xc60/0x16f0 [ 39.726890] RSP [ 39.730553] CR2: 0000000000000080 [ 39.735010] ---[ end trace 8fc9f61e0b81ccaf ]--- [ 39.739795] Kernel panic - not syncing: Fatal exception [ 39.745520] Dumping ftrace buffer: [ 39.749031] (ftrace buffer empty) [ 39.752799] Kernel Offset: disabled [ 39.756405] Rebooting in 86400 seconds..