http://bugzilla.novell.com/show_bug.cgi?id=536194
Summary: Inifite loop in DataSet.Merge() with itself
Classification: Mono
Product: Mono: Class Libraries
Version: 2.4.x
Platform: All
OS/Version: All
Status: NEW
Severity: Critical
Priority: P5 - None
Component: Sys.Data
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
Found By: ---
Description of Problem:
If you invoke DataSet.Merge(DataSet), and if the supplied parameter is the same
instance as the one for which the method is invoked, then the method executed
forever and consumes an infinite amount of memory.
Code to reproduce the problem:
DataTable dataTable = new DataTable("Test");
dataTable.Columns.Add("Test");
dataTable.Rows.Add("Test");
DataSet dataSet = new DataSet("Test");
dataSet.Tables.Add(dataTable);
dataSet.Merge(dataSet); // <-- crashes here
Actual Results:
"dataSet.Merge(dataSet)" executes forever. Memory consumption increases
quickly. It will probably crash as soon as it consumed all available memory and
cannot allocate any more.
Expected Results:
The Microsoft implementation does nothing in this case and returns immediately.
I assume that they have an additional check at the very beginning of the
DataSet.Merge(DataSet) implementation that skips the whole merge process.
How often does this happen?
Always.
Additional Information:
I assume that this bug occurs on all platforms and all systems. However, I
confirmed it on Ubuntu 9.04 x86 and x64 and on the suseLinux vmware appliance
provided by mono-project.com with mono 2.4.2.3.
I classified the severity as "critical" because I consider the behavior as s
"Crash" and "Severe Memory leak" I guess that a unit test and fix and is
quickly done.
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