Unable to truncate extent header

10.2B02 database on 64bit windows 2008R2 server

We are in transition to 11.7 but still on old version. We got this error:

Unable to truncate extent header, file = E:\AI\myDB.a22, ret = -30006. (9377)

and 

Message from PROGRESS database D:\Database\myDB (5199)

 User 22 died holding 1 shared memory locks. (5026)

Anyone that knows what could give this problem?

We have restarted the system, and everything seems ok.