https://bugzilla.novell.com/show_bug.cgi?id=665067
https://bugzilla.novell.com/show_bug.cgi?id=665067#c0 Summary: Doing 'create file' on opened file without file sharing causes data corruption. Classification: Mono Product: Mono: Class Libraries Version: 2.6.x Platform: i686 OS/Version: Ubuntu Status: NEW Severity: Normal Priority: P5 - None Component: System AssignedTo: [email protected] ReportedBy: [email protected] QAContact: [email protected] Found By: Component Test Blocker: --- Created an attachment (id=408752) --> (http://bugzilla.novell.com/attachment.cgi?id=408752) C# sample to reproduce the bug 1. Create a text file named "file.txt" with any text, e.g. "1234". 2. Open the file for appending and write data to it .. FileStream fs1 = new FileStream("file.txt", FileMode.Append, FileAccess.Write,FileShare.None); fs1.Write (System.Text.Encoding.ASCII.GetBytes ("2222"), 0, 4); .. 3. Try to create a file with the same name. This throws an IOException .. FileStream fs2; try { fs2 = new FileStream("file.txt", FileMode.Create, FileAccess.Write,FileShare.None); } catch (IOException ex) { fs1.Close (); Console.WriteLine ("Exception as expected!"); } .. Actual Results: - An IOException AS EXPECTED - the file data is modified unexpectedly. After running the program the file "file.txt" contains data: "\0\0\0\02222" After appending the string "2222" the second access (create) overrides the original data at the beginning of the file. When a fs1.Flush() was inserted at the end of step 2 the behaviour changes. Then the complete file is empty (zero length). Expected Results: - An IOException - The following file data: "12342222" A test under Windows 7/.NET 2.0 shows the desired results. How often does this happen? Every time. Additional Information: System: Linux 2.6.32-27-generic-pae #49-Ubuntu SMP Thu Dec 2 00:07:52 UTC 2010 i686 GNU/Linux -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the QA contact for the bug. You are the assignee for the bug. _______________________________________________ mono-bugs maillist - [email protected] http://lists.ximian.com/mailman/listinfo/mono-bugs
