VRDP crashing guest machine

[vinyl]

Hello,

Have some problems with Win7/64 machines on Linux/64 host. There are several VM on one host with VRDP activated. Only 4-6 are running in parallel. The problem is a VM crashing when trying to use VRDP. Sometimes it happens with a first try, sometimes on one of the next. When crashed, VM does not give any messages in own log file, any clue in VBoxSVC.log, the only one is in /var/log/messages/kern.log

Oct 3 12:18:49 s07 kernel: [49758.816603] VRDP-IN[32682]: segfault at 0 ip (null) sp 00007f83e6bfcb30 error 14 in VBoxHeadless[400000+25000]

When possible I'll try to catch core dump - it is productive machine, I'll be able to do so in the evening.

[vinyl]

Core dump attached below, tried to use FTP but host is unreacheable.

​https://enticode-my.sharepoint.com/personal/pawel_gluba_enticode_com/_layouts/15/guestaccess.aspx?docid=0066e51cc9c9b44d5b753f63e468fb7ad&authkey=AZByP7-4K6VS870bMBlSoCk

[vinyl]

Same problem on other host, but with Virtualbox 5.2.0 RC1.

Oct 3 16:06:09 s04 kernel: [ 508.410296] [UFW BLOCK] IN=eth0 OUT= MAC=00:25:90:7b:3d:00:d8:24:bd:90:07:40:08:00 SRC=94.177.250.202 DST=37.59.46.59 LEN=40 TOS=0x00 PREC=0x