[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.845197] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.888998] random: sshd: uninitialized urandom read (32 bytes read) [ 20.380588] random: sshd: uninitialized urandom read (32 bytes read) [ 20.869846] random: sshd: uninitialized urandom read (32 bytes read) [ 69.084641] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. [ 74.581060] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 23:24:07 parsed 1 programs [ 76.135061] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 23:24:09 executed programs: 0 [ 77.494895] IPVS: Creating netns size=2536 id=1 [ 77.615006] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 77.626434] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 77.669615] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 77.681361] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 77.723966] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 77.735119] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 77.747843] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 77.761574] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 78.261300] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 78.285554] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 78.292092] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 78.299786] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 79.587720] l2tp_core: tunl 4: sockfd_lookup(fd=5) returned -9 [ 80.486873] l2tp_core: tunl 4: sockfd_lookup(fd=5) returned -9 [ 81.357682] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 81.365921] IP: [] l2tp_session_create+0xc60/0x16f0 [ 81.372598] PGD 1beb6a067 [ 81.375240] PUD 1c7beb067 PMD 0 [ 81.378745] [ 81.380365] Oops: 0002 [#1] PREEMPT SMP KASAN [ 81.384848] Dumping ftrace buffer: [ 81.388385] (ftrace buffer empty) [ 81.392073] Modules linked in: [ 81.395382] CPU: 1 PID: 5729 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31 [ 81.402978] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.412307] task: ffff8801b5498000 task.stack: ffff8801cb2e0000 [ 81.418346] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 81.427461] RSP: 0018:ffff8801cb2e7ab0 EFLAGS: 00010246 [ 81.432910] RAX: 0000000000000000 RBX: ffff8801c8c75900 RCX: 1ffff10036a9311d [ 81.440154] RDX: 1ffff1003918eb00 RSI: ffff8801b54988c8 RDI: ffff8801c8c75800 [ 81.447447] RBP: ffff8801cb2e7b50 R08: ffff8801b54988e8 R09: 0000000000000000 [ 81.454694] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c8c756d8 [ 81.461940] R13: 0000000000000000 R14: ffff8801c8c75680 R15: ffff8801cb2e7c68 [ 81.469189] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f777db40 [ 81.477394] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 81.483250] CR2: 0000000000000080 CR3: 00000001beb04000 CR4: 00000000001606f0 [ 81.490496] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 81.497740] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 81.504985] Stack: [ 81.507110] 0000000000000201 ffffffff836ca141 ffff8801cb2e7ad0 ffffffff81237f0d [ 81.515100] ffff8801c8c75680 ffff8801c8c75a58 ffff8801c8c756d8 ffff8801c8c75a50 [ 81.523089] ffff8801c8c759b0 ffff8801c8c756a0 0000000000000000 0000000000000000 [ 81.531087] Call Trace: [ 81.533654] [] ? l2tp_session_get+0x1d1/0x790 [ 81.539780] [] ? trace_hardirqs_on+0xd/0x10 [ 81.545727] [] pppol2tp_connect+0x10d7/0x18f0 [ 81.551846] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 81.558055] [] ? security_socket_connect+0x8f/0xc0 [ 81.564610] [] SYSC_connect+0x1b8/0x300 [ 81.570241] [] ? debug_check_no_locks_freed+0x210/0x210 [ 81.577230] [] ? SYSC_bind+0x280/0x280 [ 81.582761] [] ? get_unused_fd_flags+0xd0/0xd0 [ 81.588972] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 81.595959] [] ? SyS_dup2+0x41f/0x5e0 [ 81.601392] [] SyS_connect+0x24/0x30 [ 81.606739] [] ? SyS_accept+0x30/0x30 [ 81.612170] [] do_fast_syscall_32+0x2f7/0x870 [ 81.618291] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 81.624936] [] entry_SYSENTER_compat+0x90/0xa2 [ 81.631147] Code: 00 00 49 8d be 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 7b 09 00 00 49 8b 86 80 01 00 00 ff 80 80 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 55 d0 [ 81.658108] RIP [] l2tp_session_create+0xc60/0x16f0 [ 81.664875] RSP [ 81.668474] CR2: 0000000000000080 [ 81.672430] ---[ end trace 3b005f1617b00bd7 ]--- [ 81.677201] Kernel panic - not syncing: Fatal exception [ 81.682902] Dumping ftrace buffer: [ 81.686422] (ftrace buffer empty) [ 81.690103] Kernel Offset: disabled [ 81.693703] Rebooting in 86400 seconds..