[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.185065] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.082707] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.429595] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.195179] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) [ 26.374136] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) Warning: Permanently added '10.128.0.41' (ECDSA) to the list of known hosts. [ 32.039224] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) 2018/08/22 16:55:11 parsed 1 programs [ 33.105923] random: cc1: uninitialized urandom read (8 bytes read, 85 bits of entropy available) 2018/08/22 16:55:13 executed programs: 0 [ 34.283397] IPVS: Creating netns size=2552 id=1 [ 34.529485] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 34.545731] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 34.629333] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 34.644572] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 34.728101] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 34.743565] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 34.759944] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 34.777331] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 34.820460] ip (3829) used greatest stack depth: 23504 bytes left [ 35.513089] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 35.556925] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 35.842203] hrtimer: interrupt took 16894 ns [ 36.106674] kasan: CONFIG_KASAN_INLINE enabled [ 36.111239] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 36.124764] Dumping ftrace buffer: [ 36.128404] (ftrace buffer empty) [ 36.132088] Modules linked in: [ 36.135456] CPU: 0 PID: 4163 Comm: syz-executor0 Not tainted 4.4.151-ge917467 #84 [ 36.143061] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.152411] task: ffff8800ba796000 task.stack: ffff8800ba570000 [ 36.158443] RIP: 0010:[] [] pppol2tp_connect+0x873/0x1910 [ 36.167294] RSP: 0018:ffff8800ba577bc8 EFLAGS: 00010202 [ 36.172714] RAX: dffffc0000000000 RBX: ffff8800bab68000 RCX: 1ffffffff0942ce0 [ 36.180061] RDX: 000000000000003b RSI: ffffffff835adf9b RDI: 00000000000001d8 [ 36.187310] RBP: ffff8800ba577d78 R08: ffff8800ba796928 R09: 0000000000000000 [ 36.194620] R10: 0000000000000001 R11: ffff8800ba796000 R12: ffff8801d8386000 [ 36.201868] R13: ffff8800bab68030 R14: 0000000000000000 R15: ffff8800ba45af00 [ 36.209116] FS: 00007fd8086c1700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.217505] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.223380] CR2: 00007f9fa2735000 CR3: 00000000bb133000 CR4: 00000000001606f0 [ 36.230634] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.237879] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.245118] Stack: [ 36.247240] ffffffff835adf3b 0000000200000006 ffff8800ba577cd0 ffff880000000000 [ 36.255223] ffff8800bab683d0 ffff8800bab68012 1ffff100174aef82 ffff8801d8386198 [ 36.263233] ffff8800ba45b080 0000000041b58ab3 ffffffff8424e778 ffffffff835ad740 [ 36.271228] Call Trace: [ 36.273789] [] ? pppol2tp_connect+0x7fb/0x1910 [ 36.280022] [] ? pppol2tp_recv+0x320/0x320 [ 36.285884] [] ? security_socket_connect+0x8f/0xc0 [ 36.292436] [] SYSC_connect+0x1b8/0x300 [ 36.298041] [] ? SYSC_bind+0x280/0x280 [ 36.303555] [] ? get_unused_fd_flags+0xd0/0xd0 [ 36.309829] [] ? do_futex+0x17f0/0x17f0 [ 36.315438] [] ? SyS_socket+0x121/0x1b0 [ 36.321175] [] ? move_addr_to_kernel+0x50/0x50 [ 36.327395] [] SyS_connect+0x24/0x30 [ 36.332748] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 36.339299] Code: fd 80 3d e0 75 45 01 00 0f 84 44 09 00 00 e8 65 66 da fd 49 8d be d8 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 60 0d 00 00 4d 8b be d8 01 00 00 e8 57 c5 cc [ 36.366566] RIP [] pppol2tp_connect+0x873/0x1910 [ 36.373068] RSP [ 36.376985] ---[ end trace 5eeb9a09d4cc41f2 ]--- [ 36.381828] Kernel panic - not syncing: Fatal exception [ 36.387467] Dumping ftrace buffer: [ 36.390982] (ftrace buffer empty) [ 36.394663] Kernel Offset: disabled [ 36.398263] Rebooting in 86400 seconds..