Submitted by: Martin Schwedhelm (schwedhelm_m)

1. Start fbServer with FIREBIRD_LOCK="C:\A"
2. Start client application which uses fbembed.dll with FIREBIRD_LOCK="C:\B"
3. Try to open a database in the client application via fbembed.dll.

The problem only occurs if the user has full rights. In my opinion the reason for that is the following code snippet:

TraceConfigStorage.cpp (line 101)

if (fb_utils::isGlobalKernelPrefix() ||
!pfnProcessIdToSessionId ||
pfnProcessIdToSessionId(GetCurrentProcessId(), &sesID) == 0 ||
sesID == 0)
{
filename.printf(TRACE_FILE); // TODO: it must be per engine instance
}
else
{
filename.printf("%s.%u", TRACE_FILE, sesID);
}

Without "fb_utils::isGlobalKernelPrefix()" everything works as expected, but I don't know if that could have side effects.