[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.359662] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.287605] random: sshd: uninitialized urandom read (32 bytes read) [ 24.739033] random: sshd: uninitialized urandom read (32 bytes read) [ 25.266858] random: sshd: uninitialized urandom read (32 bytes read) [ 25.408861] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.14' (ECDSA) to the list of known hosts. [ 30.942919] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/23 20:28:05 parsed 1 programs [ 32.259465] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/23 20:28:07 executed programs: 0 [ 33.426047] IPVS: Creating netns size=2536 id=1 [ 33.572799] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 33.584913] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 33.627048] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 33.638236] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 33.680767] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 33.692064] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 33.704497] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 33.725504] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 34.209846] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 34.234068] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 34.240162] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 34.247372] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 34.446282] hrtimer: interrupt took 19611 ns [ 34.501588] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 34.509797] IP: [] l2tp_session_create+0xc60/0x16f0 [ 34.516477] PGD 1d8282067 [ 34.519116] PUD 1d7c2b067 PMD 0 [ 34.522602] [ 34.524227] Oops: 0002 [#1] PREEMPT SMP KASAN [ 34.528737] Dumping ftrace buffer: [ 34.532254] (ftrace buffer empty) [ 34.535943] Modules linked in: [ 34.539230] CPU: 1 PID: 4147 Comm: syz-executor0 Not tainted 4.9.123-g7fa8c15 #80 [ 34.546823] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.556157] task: ffff8801d7519800 task.stack: ffff8801d69e8000 [ 34.562186] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 34.571294] RSP: 0018:ffff8801d69efac0 EFLAGS: 00010246 [ 34.576714] RAX: 0000000000000000 RBX: ffff8801d6eeb180 RCX: 1ffff1003aea341d [ 34.583955] RDX: 1ffff1003addd700 RSI: ffff8801d751a0c8 RDI: ffff8801d6eeb800 [ 34.591203] RBP: ffff8801d69efb60 R08: ffff8801d751a0e8 R09: 0000000000000000 [ 34.598496] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d6eeb6d8 [ 34.605857] R13: 0000000000000000 R14: ffff8801d6eeb680 R15: ffff8801d69efc78 [ 34.613109] FS: 00007f692eb45700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.621421] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.627284] CR2: 0000000000000080 CR3: 00000001d8182000 CR4: 00000000001606f0 [ 34.634585] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.641845] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.649096] Stack: [ 34.651225] 0000000000000201 ffffffff836ca241 ffff8801d69efae0 ffffffff81237f0d [ 34.659225] ffff8801d6eeb680 ffff8801d6eeb2d8 ffff8801d6eeb6d8 ffff8801d6eeb2d0 [ 34.667299] ffff8801d6eeb230 ffff8801d6eeb6a0 0000000000000000 0000000000000000 [ 34.675331] Call Trace: [ 34.677896] [] ? l2tp_session_get+0x1d1/0x790 [ 34.684020] [] ? trace_hardirqs_on+0xd/0x10 [ 34.689975] [] pppol2tp_connect+0x10d7/0x18f0 [ 34.696098] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 34.702344] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 34.708918] [] ? check_preemption_disabled+0x3b/0x170 [ 34.715751] [] ? retint_kernel+0x2d/0x2d [ 34.721443] [] ? security_socket_connect+0x8f/0xc0 [ 34.728003] [] SYSC_connect+0x1b8/0x300 [ 34.733608] [] ? SYSC_bind+0x280/0x280 [ 34.739135] [] ? do_futex+0x17c0/0x17c0 [ 34.745036] [] ? move_addr_to_kernel+0x50/0x50 [ 34.751251] [] SyS_connect+0x24/0x30 [ 34.756590] [] ? SyS_accept+0x30/0x30 [ 34.762016] [] do_syscall_64+0x1a6/0x490 [ 34.767762] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.774725] 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 [ 34.801881] RIP [] l2tp_session_create+0xc60/0x16f0 [ 34.808706] RSP [ 34.812309] CR2: 0000000000000080 [ 34.817543] ---[ end trace 0b26ff1bca9a8217 ]--- [ 34.822565] Kernel panic - not syncing: Fatal exception [ 34.828182] Dumping ftrace buffer: [ 34.831697] (ftrace buffer empty) [ 34.835382] Kernel Offset: disabled [ 34.838993] Rebooting in 86400 seconds..