[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.186684] 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: [ 26.824375] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.435391] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 28.134061] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 28.317192] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) Warning: Permanently added '10.128.15.197' (ECDSA) to the list of known hosts. [ 33.959934] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) 2018/08/23 19:51:21 parsed 1 programs [ 35.120754] random: cc1: uninitialized urandom read (8 bytes read, 77 bits of entropy available) 2018/08/23 19:51:23 executed programs: 0 [ 36.476059] IPVS: Creating netns size=2552 id=1 [ 36.728311] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 36.743376] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 36.827251] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 36.843072] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 36.925714] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 36.941120] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 36.957634] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 36.975251] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 37.055190] ip (3958) used greatest stack depth: 24144 bytes left [ 37.728610] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 37.771277] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 38.070754] hrtimer: interrupt took 42063 ns [ 38.313377] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 38.321688] IP: [] l2tp_session_create+0x948/0x1030 [ 38.328415] PGD 1cf2de067 PUD 1d8b06067 PMD 0 [ 38.333339] Oops: 0002 [#1] PREEMPT SMP KASAN [ 38.338303] Dumping ftrace buffer: [ 38.341814] (ftrace buffer empty) [ 38.345602] Modules linked in: [ 38.348920] CPU: 0 PID: 4262 Comm: syz-executor0 Not tainted 4.4.151-g3a2ec58 #86 [ 38.356513] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.365911] task: ffff8800b94eb000 task.stack: ffff8800b97d0000 [ 38.371948] RIP: 0010:[] [] l2tp_session_create+0x948/0x1030 [ 38.381065] RSP: 0018:ffff8800b97d7b48 EFLAGS: 00010246 [ 38.386489] RAX: 0000000000000000 RBX: ffff8801da30e000 RCX: 0000000000000006 [ 38.393749] RDX: 1ffff1003b461c30 RSI: ffffffff835a4633 RDI: ffff8801da30e180 [ 38.401114] RBP: ffff8800b97d7bb8 R08: ffff8800b94eb900 R09: 0000000000000000 [ 38.408362] R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801da2739a8 [ 38.415606] R13: ffff8800b97d7cd0 R14: ffff8801da273900 R15: ffffffff835a3260 [ 38.422849] FS: 00007f6670c89700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 38.431050] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 38.436904] CR2: 0000000000000080 CR3: 00000001cf365000 CR4: 00000000001606f0 [ 38.444149] Stack: [ 38.446273] ffffffff81140a6a ffff8801da30e020 ffff8801da273a58 ffff8801da273910 [ 38.454262] ffffffff838cbb80 ffff8801da2739b0 ffff8801da273a50 ffff8801da30e0e0 [ 38.462261] ffffffff00000000 ffff8801d6c59980 0000000000000000 ffff8801d6c599b0 [ 38.470262] Call Trace: [ 38.472836] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 38.479135] [] ? _raw_read_unlock_bh+0x30/0x40 [ 38.485343] [] pppol2tp_connect+0x10f0/0x1910 [ 38.491465] [] ? pppol2tp_recv+0x320/0x320 [ 38.497329] [] ? security_socket_connect+0x8f/0xc0 [ 38.503885] [] SYSC_connect+0x1b8/0x300 [ 38.509487] [] ? SYSC_perf_event_open+0x211/0x2470 [ 38.516040] [] ? SYSC_bind+0x280/0x280 [ 38.521551] [] ? get_unused_fd_flags+0xd0/0xd0 [ 38.527770] [] ? do_futex+0x17f0/0x17f0 [ 38.533384] [] ? move_addr_to_kernel+0x50/0x50 [ 38.539590] [] SyS_connect+0x24/0x30 [ 38.544930] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 38.551480] 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 [ 38.578517] RIP [] l2tp_session_create+0x948/0x1030 [ 38.585285] RSP [ 38.588884] CR2: 0000000000000080 [ 38.594486] ---[ end trace 9e614c419742fa2e ]--- [ 38.599242] Kernel panic - not syncing: Fatal exception [ 38.604885] Dumping ftrace buffer: [ 38.608406] (ftrace buffer empty) [ 38.612089] Kernel Offset: disabled [ 38.615689] Rebooting in 86400 seconds..