[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.634307] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.465133] random: sshd: uninitialized urandom read (32 bytes read) [ 26.017750] random: sshd: uninitialized urandom read (32 bytes read) [ 26.543789] random: sshd: uninitialized urandom read (32 bytes read) [ 35.857855] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.9' (ECDSA) to the list of known hosts. [ 41.479315] random: sshd: uninitialized urandom read (32 bytes read) 2018/08/22 16:58:36 parsed 1 programs [ 42.848664] random: cc1: uninitialized urandom read (8 bytes read) 2018/08/22 16:58:38 executed programs: 0 [ 44.174731] IPVS: Creating netns size=2536 id=1 [ 44.298992] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 44.311078] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 44.353787] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 44.365330] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 44.408974] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 44.420786] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 44.432556] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 44.453386] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 44.957810] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 44.983083] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 44.989264] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 44.996078] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 45.200402] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [ 45.208624] IP: [] l2tp_session_create+0xc60/0x16f0 [ 45.215302] PGD 1d98a6067 [ 45.217942] PUD 1d8739067 PMD 0 [ 45.221423] [ 45.223056] Oops: 0002 [#1] PREEMPT SMP KASAN [ 45.227523] Dumping ftrace buffer: [ 45.231032] (ftrace buffer empty) [ 45.234713] Modules linked in: [ 45.237999] CPU: 0 PID: 4209 Comm: syz-executor0 Not tainted 4.9.123-g8dd3fc2 #31 [ 45.245590] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.255021] task: ffff8801d718b000 task.stack: ffff8801d5708000 [ 45.261145] RIP: 0010:[] [] l2tp_session_create+0xc60/0x16f0 [ 45.270383] RSP: 0018:ffff8801d570fab0 EFLAGS: 00010246 [ 45.275804] RAX: 0000000000000000 RBX: ffff8801da26f900 RCX: 1ffff1003ae3171d [ 45.283046] RDX: 1ffff1003b44bc30 RSI: ffff8801d718b8c8 RDI: ffff8801da25e180 [ 45.290292] RBP: ffff8801d570fb50 R08: ffff8801d718b8e8 R09: 0000000000000000 [ 45.297624] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801da25e058 [ 45.304866] R13: 0000000000000000 R14: ffff8801da25e000 R15: ffff8801d570fc68 [ 45.312119] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f773cb40 [ 45.320320] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 45.326174] CR2: 0000000000000080 CR3: 00000001d980b000 CR4: 00000000001606f0 [ 45.333422] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 45.340664] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 45.347906] Stack: [ 45.350029] 0000000000000201 ffffffff836ca141 ffff8801d570fad0 ffffffff81237f0d [ 45.358118] ffff8801da25e000 ffff8801da26fa58 ffff8801da25e058 ffff8801da26fa50 [ 45.366115] ffff8801da26f9b0 ffff8801da25e020 0000000000000000 0000000000000000 [ 45.374217] Call Trace: [ 45.376782] [] ? l2tp_session_get+0x1d1/0x790 [ 45.382906] [] ? trace_hardirqs_on+0xd/0x10 [ 45.388855] [] pppol2tp_connect+0x10d7/0x18f0 [ 45.394976] [] ? pppol2tp_seq_show+0xc30/0xc30 [ 45.401240] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 45.407808] [] ? check_preemption_disabled+0x3b/0x170 [ 45.414676] [] ? retint_kernel+0x2d/0x2d [ 45.420372] [] ? security_socket_connect+0x8f/0xc0 [ 45.426933] [] SYSC_connect+0x1b8/0x300 [ 45.432542] [] ? SYSC_bind+0x280/0x280 [ 45.438064] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 45.445161] [] ? move_addr_to_kernel+0x50/0x50 [ 45.451431] [] SyS_connect+0x24/0x30 [ 45.456779] [] ? SyS_accept+0x30/0x30 [ 45.462205] [] do_fast_syscall_32+0x2f7/0x870 [ 45.468327] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.474968] [] entry_SYSENTER_compat+0x90/0xa2 [ 45.481170] 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 [ 45.508161] RIP [] l2tp_session_create+0xc60/0x16f0 [ 45.514927] RSP [ 45.518527] CR2: 0000000000000080 [ 45.522800] ---[ end trace b41ffbcc0cb1e86f ]--- [ 45.527608] Kernel panic - not syncing: Fatal exception [ 45.533307] Dumping ftrace buffer: [ 45.536821] (ftrace buffer empty) [ 45.540509] Kernel Offset: disabled [ 45.544118] Rebooting in 86400 seconds..