[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.825209] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.587158] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.869471] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 27.540359] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 61.428228] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. [ 66.961213] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) 2018/08/22 22:03:22 parsed 1 programs [ 68.682075] random: cc1: uninitialized urandom read (8 bytes read, 85 bits of entropy available) 2018/08/22 22:03:24 executed programs: 0 [ 69.869050] IPVS: Creating netns size=2552 id=1 [ 70.117328] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 70.133560] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 70.217210] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 70.232116] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 70.317312] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 70.333138] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 70.349210] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 70.366886] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 71.097397] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 71.136395] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 71.428808] hrtimer: interrupt took 20535 ns [ 71.770588] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 71.778822] IP: [] l2tp_session_create+0x948/0x1030 [ 71.785510] PGD 1d8fb5067 PUD 1d94a2067 PMD 0 [ 71.790440] Oops: 0002 [#1] PREEMPT SMP KASAN [ 71.795422] Dumping ftrace buffer: [ 71.798939] (ftrace buffer empty) [ 71.802628] Modules linked in: [ 71.806024] CPU: 1 PID: 4225 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #20 [ 71.813657] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.822998] task: ffff8801d79d3000 task.stack: ffff8801d7ad8000 [ 71.829031] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 71.838208] RSP: 0018:ffff8801d7adfad0 EFLAGS: 00010246 [ 71.843638] RAX: 0000000000000000 RBX: ffff8800b99ce000 RCX: 0000000000000006 [ 71.850889] RDX: 1ffff10017339c30 RSI: ffffffff835a4543 RDI: ffff8800b99ce180 [ 71.858153] RBP: ffff8801d7adfb40 R08: ffff8801d79d3900 R09: 0000000000000000 [ 71.865400] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b94f4828 [ 71.872646] R13: ffff8801d7adfc58 R14: ffff8800b94f4780 R15: ffffffff835a3170 [ 71.879911] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7773b40 [ 71.888128] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 71.893985] CR2: 0000000000000080 CR3: 00000001da1a0000 CR4: 00000000001606f0 [ 71.901238] Stack: [ 71.903360] ffffffff81140a6a ffff8800b99ce020 ffff8800b94f48d8 ffff8800b94f4790 [ 71.911359] ffffffff838cba90 ffff8800b94f4830 ffff8800b94f48d0 ffff8800b99ce0e0 [ 71.919348] ffffffff00000000 ffff8801d7bc2a80 0000000000000000 ffff8801d7bc2ab0 [ 71.927349] Call Trace: [ 71.929916] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 71.936212] [] ? _raw_read_unlock_bh+0x30/0x40 [ 71.942435] [] pppol2tp_connect+0x10f0/0x1910 [ 71.948557] [] ? pppol2tp_recv+0x320/0x320 [ 71.954420] [] ? security_socket_connect+0x8f/0xc0 [ 71.960984] [] SYSC_connect+0x1b8/0x300 [ 71.966585] [] ? SYSC_bind+0x280/0x280 [ 71.972096] [] ? get_unused_fd_flags+0xd0/0xd0 [ 71.978312] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 71.985308] [] ? SyS_socket+0x121/0x1b0 [ 71.990912] [] ? move_addr_to_kernel+0x50/0x50 [ 71.997119] [] SyS_connect+0x24/0x30 [ 72.002458] [] ? SyS_accept+0x30/0x30 [ 72.007899] [] do_fast_syscall_32+0x324/0x8b0 [ 72.014019] [] sysenter_flags_fixed+0xd/0x1a [ 72.020048] 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 [ 72.046971] RIP [] l2tp_session_create+0x948/0x1030 [ 72.053736] RSP [ 72.057333] CR2: 0000000000000080 [ 72.065187] ---[ end trace b5e0374fcca2631d ]--- [ 72.069947] Kernel panic - not syncing: Fatal exception [ 72.075595] Dumping ftrace buffer: [ 72.079140] (ftrace buffer empty) [ 72.082851] Kernel Offset: disabled [ 72.086454] Rebooting in 86400 seconds..