[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.520174] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 24.441213] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.669730] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.276248] random: sshd: uninitialized urandom read (32 bytes read, 57 bits of entropy available) [ 39.545020] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) Warning: Permanently added '10.128.0.15' (ECDSA) to the list of known hosts. [ 45.230259] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) 2018/08/23 03:08:32 parsed 1 programs [ 46.455309] random: cc1: uninitialized urandom read (8 bytes read, 70 bits of entropy available) 2018/08/23 03:08:34 executed programs: 0 [ 47.817625] IPVS: Creating netns size=2552 id=1 [ 48.053637] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 48.069333] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 48.149132] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 48.163529] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 48.244879] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 48.260789] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 48.277640] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 48.294087] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 49.019044] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 49.057796] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 49.609200] l2tp_core: tunl 4: sockfd_lookup(fd=5) returned -9 [ 49.658125] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 49.666390] IP: [] l2tp_session_create+0x948/0x1030 [ 49.673074] PGD 1da23d067 PUD 1da0d0067 PMD 0 [ 49.677994] Oops: 0002 [#1] PREEMPT SMP KASAN [ 49.682935] Dumping ftrace buffer: [ 49.686449] (ftrace buffer empty) [ 49.690137] Modules linked in: [ 49.693426] CPU: 1 PID: 4345 Comm: syz-executor0 Not tainted 4.4.151-g37af2ff #85 [ 49.701018] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.710351] task: ffff8800ba333000 task.stack: ffff8801d68f0000 [ 49.716382] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 49.725596] RSP: 0018:ffff8801d68f7b48 EFLAGS: 00010246 [ 49.731020] RAX: 0000000000000000 RBX: ffff8801da2de280 RCX: 0000000000000006 [ 49.738267] RDX: 1ffff1003b45bc80 RSI: ffffffff835a4543 RDI: ffff8801da2de400 [ 49.745577] RBP: ffff8801d68f7bb8 R08: ffff8800ba333900 R09: 0000000000000000 [ 49.752829] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8800b93be828 [ 49.760079] R13: ffff8801d68f7cd0 R14: ffff8800b93be780 R15: ffffffff835a3170 [ 49.767370] FS: 00007f3cb0cf9700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 49.775582] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.781440] CR2: 0000000000000080 CR3: 00000001da217000 CR4: 00000000001606f0 [ 49.788692] Stack: [ 49.790816] ffffffff81140a6a ffff8801da2de2a0 ffff8800b93be8d8 ffff8800b93be790 [ 49.798855] ffffffff838cba90 ffff8800b93be830 ffff8800b93be8d0 ffff8801da2de360 [ 49.806859] ffffffff00000000 ffff8801d6ceaa80 0000000000000000 ffff8801d6ceaab0 [ 49.814908] Call Trace: [ 49.817480] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 49.823782] [] ? _raw_read_unlock_bh+0x30/0x40 [ 49.830037] [] pppol2tp_connect+0x10f0/0x1910 [ 49.836163] [] ? pppol2tp_recv+0x320/0x320 [ 49.842026] [] ? security_socket_connect+0x8f/0xc0 [ 49.848582] [] SYSC_connect+0x1b8/0x300 [ 49.854180] [] ? SYSC_bind+0x280/0x280 [ 49.859691] [] ? get_unused_fd_flags+0xd0/0xd0 [ 49.865916] [] ? do_futex+0x17f0/0x17f0 [ 49.871525] [] ? SyS_socket+0x121/0x1b0 [ 49.877136] [] ? move_addr_to_kernel+0x50/0x50 [ 49.883411] [] SyS_connect+0x24/0x30 [ 49.888861] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 49.895477] 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 [ 49.922658] RIP [] l2tp_session_create+0x948/0x1030 [ 49.929432] RSP [ 49.933032] CR2: 0000000000000080 [ 49.937406] ---[ end trace e87fdae49e8aca96 ]--- [ 49.942152] Kernel panic - not syncing: Fatal exception [ 49.947840] Dumping ftrace buffer: [ 49.951409] (ftrace buffer empty) [ 49.955102] Kernel Offset: disabled [ 49.958705] Rebooting in 86400 seconds..