[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.497105] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.881143] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.268723] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.963113] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) [ 47.744432] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.0.3' (ECDSA) to the list of known hosts. [ 53.215183] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) 2018/08/29 00:03:19 parsed 1 programs [ 54.609401] random: cc1: uninitialized urandom read (8 bytes read, 80 bits of entropy available) 2018/08/29 00:03:21 executed programs: 0 [ 55.473880] IPVS: Creating netns size=2552 id=1 [ 55.714219] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 55.729047] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 55.811410] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 55.827380] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 55.907679] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 55.923190] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 55.939919] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 55.955705] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 55.997649] ip (3908) used greatest stack depth: 23200 bytes left [ 56.671597] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 56.710597] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 56.993244] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 57.079747] hrtimer: interrupt took 29112 ns [ 57.165003] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 57.464499] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 57.622468] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 57.919825] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 58.055800] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 58.064040] IP: [] l2tp_session_create+0x948/0x1030 [ 58.070730] PGD bb85c067 PUD b95ec067 PMD 0 [ 58.075506] Oops: 0002 [#1] PREEMPT SMP KASAN [ 58.080522] Dumping ftrace buffer: [ 58.084040] (ftrace buffer empty) [ 58.087843] Modules linked in: [ 58.091144] CPU: 1 PID: 4400 Comm: syz-executor0 Not tainted 4.4.153-g5e24b4e #26 [ 58.098786] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.108135] task: ffff8800b7afb000 task.stack: ffff8800aef30000 [ 58.114169] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 58.123297] RSP: 0018:ffff8800aef37ad0 EFLAGS: 00010246 [ 58.128727] RAX: 0000000000000000 RBX: ffff8801d491ea00 RCX: 0000000000000006 [ 58.135977] RDX: 1ffff1003a923d70 RSI: ffffffff835a4c93 RDI: ffff8801d491eb80 [ 58.143229] RBP: ffff8800aef37b40 R08: 000000000000000a R09: 000000000000ffff [ 58.150482] R10: ffffed003a95b248 R11: ffffffff8463a200 R12: ffff8801d4ad9228 [ 58.157732] R13: ffff8800aef37c58 R14: ffff8801d4ad9180 R15: ffffffff835a38c0 [ 58.164988] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7723b40 [ 58.173195] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 58.179056] CR2: 0000000000000080 CR3: 00000000b8e4d000 CR4: 00000000001606f0 [ 58.186308] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 58.193562] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 58.200813] Stack: [ 58.202940] ffffffff81140aba ffff8801d491ea20 ffff8801d4ad92d8 ffff8801d4ad9190 [ 58.210967] ffffffff838cc1e0 ffff8801d4ad9230 ffff8801d4ad92d0 ffff8801d491eae0 [ 58.218990] ffffffff00000000 ffff8800aef88000 0000000000000000 ffff8800aef88030 [ 58.227000] Call Trace: [ 58.229573] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 58.235893] [] ? _raw_read_unlock_bh+0x30/0x40 [ 58.242133] [] pppol2tp_connect+0x10f0/0x1910 [ 58.248259] [] ? pppol2tp_recv+0x320/0x320 [ 58.254127] [] ? security_socket_connect+0x8f/0xc0 [ 58.260692] [] SYSC_connect+0x1b8/0x300 [ 58.266299] [] ? SYSC_perf_event_open+0x211/0x2470 [ 58.272861] [] ? SYSC_bind+0x280/0x280 [ 58.278378] [] ? get_unused_fd_flags+0xd0/0xd0 [ 58.284597] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 58.291591] [] ? move_addr_to_kernel+0x50/0x50 [ 58.297805] [] SyS_connect+0x24/0x30 [ 58.303147] [] ? SyS_accept+0x30/0x30 [ 58.308579] [] do_fast_syscall_32+0x324/0x8b0 [ 58.314707] [] sysenter_flags_fixed+0xd/0x1a [ 58.320765] Code: 00 00 48 8d bb 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 36 06 00 00 48 8b 83 80 01 00 00 ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 f1 13 [ 58.347986] RIP [] l2tp_session_create+0x948/0x1030 [ 58.354777] RSP [ 58.358379] CR2: 0000000000000080 [ 58.363101] ---[ end trace bd8bd4b30988c2e7 ]--- [ 58.367894] Kernel panic - not syncing: Fatal exception [ 58.373581] Dumping ftrace buffer: [ 58.377097] (ftrace buffer empty) [ 58.380783] Kernel Offset: disabled [ 58.384382] Rebooting in 86400 seconds..