[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.917961] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.070007] random: sshd: uninitialized urandom read (32 bytes read) [ 27.494030] random: sshd: uninitialized urandom read (32 bytes read) [ 27.901074] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. [ 33.583646] urandom_read: 1 callbacks suppressed [ 33.583649] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 20:46:34 parsed 1 programs [ 35.194726] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 20:46:37 executed programs: 0 [ 36.762024] IPVS: Creating netns size=2536 id=1 [ 36.892341] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 36.904306] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 36.949264] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 36.960972] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 37.005222] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 37.017406] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 37.030016] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 37.050475] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 37.110722] ip (3931) used greatest stack depth: 24264 bytes left [ 37.213768] ip (3973) used greatest stack depth: 23976 bytes left [ 37.575318] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 37.601565] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 37.607945] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 37.614659] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 37.820943] hrtimer: interrupt took 17624 ns [ 37.825677] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 [ 37.927997] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 [ 38.107978] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 [ 38.237956] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 [ 38.285213] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 [ 38.373060] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 [ 38.403272] l2tp_core: tunl 4: sockfd_lookup(fd=7) returned -9 [ 38.732584] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 38.740849] IP: [] l2tp_session_create+0xc60/0x16f0 [ 38.747534] PGD 1cefbb067 [ 38.750178] PUD 1cd9a4067 PMD 0 [ 38.753719] [ 38.755343] Oops: 0002 [#1] PREEMPT SMP KASAN [ 38.759817] Dumping ftrace buffer: [ 38.763374] (ftrace buffer empty) [ 38.767165] Modules linked in: [ 38.770461] CPU: 1 PID: 4666 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31 [ 38.778057] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.787708] task: ffff8801cdde1800 task.stack: ffff8801cd918000 [ 38.793738] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 38.802852] RSP: 0018:ffff8801cd91fab0 EFLAGS: 00010246 [ 38.808275] RAX: 0000000000000000 RBX: ffff8801cfdf4a00 RCX: 1ffff10039bbc41d [ 38.815518] RDX: 1ffff10039fbe880 RSI: ffff8801cdde20c8 RDI: ffff8801cfdf4400 [ 38.822760] RBP: ffff8801cd91fb50 R08: ffff8801cdde20e8 R09: 0000000000000000 [ 38.830008] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801cfdf42d8 [ 38.837255] R13: 0000000000000000 R14: ffff8801cfdf4280 R15: ffff8801cd91fc68 [ 38.844501] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7775b40 [ 38.852705] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 38.858566] CR2: 0000000000000080 CR3: 00000001cee70000 CR4: 00000000001606f0 [ 38.865813] Stack: [ 38.867986] 0000000000000201 ffffffff836ca141 ffff8801cd91fad0 ffffffff81237f0d [ 38.875992] ffff8801cfdf4280 ffff8801cfdf4b58 ffff8801cfdf42d8 ffff8801cfdf4b50 [ 38.883990] ffff8801cfdf4ab0 ffff8801cfdf42a0 0000000000000000 0000000000000000 [ 38.891986] Call Trace: [ 38.894557] [] ? l2tp_session_get+0x1d1/0x790 [ 38.900683] [] ? trace_hardirqs_on+0xd/0x10 [ 38.906701] [] pppol2tp_connect+0x10d7/0x18f0 [ 38.912837] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 38.919050] [] ? lock_acquire+0x173/0x3e0 [ 38.924828] [] ? security_socket_connect+0x8f/0xc0 [ 38.931392] [] SYSC_connect+0x1b8/0x300 [ 38.937053] [] ? SYSC_bind+0x280/0x280 [ 38.942640] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 38.949641] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 38.956634] [] SyS_connect+0x24/0x30 [ 38.961975] [] ? SyS_accept+0x30/0x30 [ 38.967405] [] do_fast_syscall_32+0x2f7/0x870 [ 38.973570] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.980279] [] entry_SYSENTER_compat+0x90/0xa2 [ 38.986489] 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 [ 39.013430] RIP [] l2tp_session_create+0xc60/0x16f0 [ 39.020202] RSP [ 39.023807] CR2: 0000000000000080 [ 39.028377] ---[ end trace a1f11630b49f5aaa ]--- [ 39.033132] Kernel panic - not syncing: Fatal exception [ 39.038798] Dumping ftrace buffer: [ 39.042317] (ftrace buffer empty) [ 39.046017] Kernel Offset: disabled [ 39.049624] Rebooting in 86400 seconds..