[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.561891] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.675088] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 22.980709] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 23.667594] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 66.016833] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 71.586446] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) 2018/08/22 16:55:00 parsed 1 programs [ 73.151590] random: cc1: uninitialized urandom read (8 bytes read, 87 bits of entropy available) 2018/08/22 16:55:02 executed programs: 0 [ 74.577218] IPVS: Creating netns size=2552 id=1 [ 74.826594] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 74.842339] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 74.928199] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 74.943770] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 75.025290] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 75.040323] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 75.058100] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 75.074461] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 75.824960] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 75.865074] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 76.157244] hrtimer: interrupt took 11499 ns [ 77.483802] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 78.753651] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 78.761875] IP: [] l2tp_session_create+0x948/0x1030 [ 78.768555] PGD b6112067 PUD b6644067 PMD 0 [ 78.773306] Oops: 0002 [#1] PREEMPT SMP KASAN [ 78.778244] Dumping ftrace buffer: [ 78.781790] (ftrace buffer empty) [ 78.785477] Modules linked in: [ 78.788778] CPU: 1 PID: 4714 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20 [ 78.796385] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.805731] task: ffff8800b6b90000 task.stack: ffff8800b03f0000 [ 78.811760] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 78.820866] RSP: 0018:ffff8800b03f7ad0 EFLAGS: 00010246 [ 78.826308] RAX: 0000000000000000 RBX: ffff8801d0b3d180 RCX: 0000000000000006 [ 78.833553] RDX: 1ffff1003a167a60 RSI: ffffffff835a4543 RDI: ffff8801d0b3d300 [ 78.840812] RBP: ffff8800b03f7b40 R08: ffff8800b6b90900 R09: 0000000000000000 [ 78.848057] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801d0b3d4a8 [ 78.855308] R13: ffff8800b03f7c58 R14: ffff8801d0b3d400 R15: ffffffff835a3170 [ 78.862555] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77a8b40 [ 78.870761] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 78.876625] CR2: 0000000000000080 CR3: 00000000b66ac000 CR4: 00000000001606f0 [ 78.883869] Stack: [ 78.885990] ffffffff81140a6a ffff8801d0b3d1a0 ffff8801d0b3d558 ffff8801d0b3d410 [ 78.893973] ffffffff838cba90 ffff8801d0b3d4b0 ffff8801d0b3d550 ffff8801d0b3d260 [ 78.901965] ffffffff00000000 ffff8801d37ce600 0000000000000000 ffff8801d37ce630 [ 78.909946] Call Trace: [ 78.912510] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 78.918807] [] ? _raw_read_unlock_bh+0x30/0x40 [ 78.925035] [] pppol2tp_connect+0x10f0/0x1910 [ 78.931181] [] ? pppol2tp_recv+0x320/0x320 [ 78.937049] [] ? security_socket_connect+0x8f/0xc0 [ 78.943609] [] SYSC_connect+0x1b8/0x300 [ 78.949213] [] ? SYSC_perf_event_open+0x211/0x2470 [ 78.955771] [] ? SYSC_bind+0x280/0x280 [ 78.961374] [] ? get_unused_fd_flags+0xd0/0xd0 [ 78.967597] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 78.974590] [] SyS_connect+0x24/0x30 [ 78.979932] [] ? SyS_accept+0x30/0x30 [ 78.985372] [] do_fast_syscall_32+0x324/0x8b0 [ 78.991497] [] sysenter_flags_fixed+0xd/0x1a [ 78.997524] 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 [ 79.024393] RIP [] l2tp_session_create+0x948/0x1030 [ 79.031157] RSP [ 79.034756] CR2: 0000000000000080 [ 79.039744] ---[ end trace 9badef1fc73d39e7 ]--- [ 79.044514] Kernel panic - not syncing: Fatal exception [ 79.050279] Dumping ftrace buffer: [ 79.053813] (ftrace buffer empty) [ 79.057498] Kernel Offset: disabled [ 79.061096] Rebooting in 86400 seconds..