[....] 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[ 15.259666] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.562960] random: sshd: uninitialized urandom read (32 bytes read) [ 28.893266] random: sshd: uninitialized urandom read (32 bytes read) [ 29.412320] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.14' (ECDSA) to the list of known hosts. [ 35.075821] urandom_read: 1 callbacks suppressed [ 35.075825] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 20:35:00 parsed 1 programs [ 36.261567] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 20:35:01 executed programs: 0 [ 37.534842] IPVS: Creating netns size=2536 id=1 [ 37.664258] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 37.676061] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 37.720229] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 37.732250] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 37.777656] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 37.789031] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 37.801965] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 37.823672] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 38.346663] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 38.372961] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 38.379063] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 38.386591] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 38.591351] hrtimer: interrupt took 11970 ns [ 38.666995] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 38.734148] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 38.794393] l2tp_core: tunl 4: sockfd_lookup(fd=6) returned -9 [ 38.878463] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 38.886796] IP: [] l2tp_session_create+0xc60/0x16f0 [ 38.893477] PGD 1d9751067 [ 38.896117] PUD 1d7b40067 PMD 0 [ 38.899601] [ 38.901220] Oops: 0002 [#1] PREEMPT SMP KASAN [ 38.905708] Dumping ftrace buffer: [ 38.909224] (ftrace buffer empty) [ 38.912912] Modules linked in: [ 38.916202] CPU: 0 PID: 4356 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #79 [ 38.923791] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.933120] task: ffff8801d4f8b000 task.stack: ffff8801d3cc8000 [ 38.939152] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 38.948276] RSP: 0018:ffff8801d3ccfac0 EFLAGS: 00010246 [ 38.953704] RAX: 0000000000000000 RBX: ffff8801d46e6f00 RCX: 1ffff1003a9f171d [ 38.960959] RDX: 1ffff1003a825080 RSI: ffff8801d4f8b8c8 RDI: ffff8801d4128400 [ 38.968315] RBP: ffff8801d3ccfb60 R08: ffff8801d4f8b8e8 R09: 0000000000000000 [ 38.975562] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d41282d8 [ 38.982810] R13: 0000000000000000 R14: ffff8801d4128280 R15: ffff8801d3ccfc78 [ 38.990061] FS: 00007f7969753700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 38.998267] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.004132] CR2: 0000000000000080 CR3: 00000001da2f4000 CR4: 00000000001606f0 [ 39.011384] Stack: [ 39.013513] 0000000000000201 ffffffff836ca141 ffff8801d3ccfae0 ffffffff81237f0d [ 39.021504] ffff8801d4128280 ffff8801d46e7058 ffff8801d41282d8 ffff8801d46e7050 [ 39.029513] ffff8801d46e6fb0 ffff8801d41282a0 0000000000000000 0000000000000000 [ 39.037514] Call Trace: [ 39.040082] [] ? l2tp_session_get+0x1d1/0x790 [ 39.046202] [] ? trace_hardirqs_on+0xd/0x10 [ 39.052152] [] pppol2tp_connect+0x10d7/0x18f0 [ 39.058273] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 39.064488] [] ? security_socket_connect+0x8f/0xc0 [ 39.071049] [] SYSC_connect+0x1b8/0x300 [ 39.076650] [] ? SYSC_bind+0x280/0x280 [ 39.082166] [] ? do_futex+0x17c0/0x17c0 [ 39.087770] [] ? do_futex+0x17c0/0x17c0 [ 39.093385] [] SyS_connect+0x24/0x30 [ 39.098727] [] ? SyS_accept+0x30/0x30 [ 39.104159] [] do_syscall_64+0x1a6/0x490 [ 39.109879] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 39.116799] 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 [ 39.144040] RIP [] l2tp_session_create+0xc60/0x16f0 [ 39.150802] RSP [ 39.154401] CR2: 0000000000000080 [ 39.158371] ---[ end trace a38347ce0b8d4c1e ]--- [ 39.163457] Kernel panic - not syncing: Fatal exception [ 39.169101] Dumping ftrace buffer: [ 39.172620] (ftrace buffer empty) [ 39.176368] Kernel Offset: disabled [ 39.179976] Rebooting in 86400 seconds..