Still no luck but.. I have analysed previous log and i found interesting entry
DESKTOP-6BKOVL9 Sat Oct 27 13:29:19 2018 I/O error during "ReadFile" operation for file "C:\WINDOWS\TEMP\FB_TABLE_5FBVM1" Error while trying to read from file Nieprawidłowe dojście. but in Firebird.conf i have this configuration TempDirectories = O:\temp Why Firebird have used C:\WINDOWS\TEMP which is my old SSD, still working but it is not so good. Only when i create FIREBIRD_TMP it did not create any file in C:\WINDOWS\TEMP directory. I can’t figure out why it prefere Windows temp instead.. Maybe in some point FB eat whole space (20GB) of O:\temp and go there. DB size was 7GB. But in all current tests FB never go to C:\WINDOWS\TEMP. Maybe the reason of bugcheck was releated to my SSD use… Regards, Karol Bieniaszewski
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