[Mono-bugs] [Bug 78123][Nor] New - Race in Threading code

[bugzilla-daemon at bugzilla.ximian.com]

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Changed by s-kiess at web.de.

http://bugzilla.ximian.com/show_bug.cgi?id=78123

--- shadow/78123	2006-04-16 12:13:16.000000000 -0400
+++ shadow/78123.tmp.1871	2006-04-16 12:13:16.000000000 -0400
@@ -0,0 +1,107 @@
+Bug#: 78123
+Product: Mono: Runtime
+Version: 1.0
+OS: 
+OS Details: 
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: misc
+AssignedTo: mono-bugs at ximian.com                            
+ReportedBy: s-kiess at web.de               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: Race in Threading code
+
+Description of Problem: A Thread which is aborted immediately after startup
+causes a segfault.
+
+
+Steps to reproduce the problem:
+1. cat > thread.cs << EOF
+using System;
+using System.Threading;
+
+public class M {
+  public static void DoNothing () {
+    //Thread.Sleep (0);
+  }
+    
+  public static void Main () {
+    for (int i=0; ; i++) {
+      Console.WriteLine (i);
+
+      Thread thread = new Thread (DoNothing);
+      thread.Start ();
+      //Thread.Sleep (0);
+      thread.Abort ();
+      thread.Join ();
+    }
+  }
+}
+EOF
+2. mcs thread.cs
+3. mono thread.exe
+
+Actual Results:
+0
+
+=================================================================
+Got a SIGSEGV while executing native code. This usually indicates
+a fatal error in the mono runtime or one of the native libraries
+used by your application.
+=================================================================
+
+Stacktrace:
+
+
+Native stacktrace:
+
+Speicherzugriffsfehler
+
+
+Expected Results:
+0
+1
+2
+3
+...
+
+How often does this happen? 
+always. (Sometimes the program crashes at the second iteration.)
+
+Additional Information:
+When one of the Thread.Sleep (0) lines is enabled, the code works.
+
+On another computer using Mono 1.1.13.2 the code works.
+
+mono --version
+Mono JIT compiler version 1.1.13.6, (C) 2002-2005 Novell, Inc and
+Contributors. www.mono-project.com
+        TLS:           normal
+        GC:            Included Boehm (with typed GC)
+        SIGSEGV      : normal
+
+cat /proc/cpuinfo
+processor       : 0
+vendor_id       : GenuineIntel
+cpu family      : 6
+model           : 9
+model name      : Intel(R) Pentium(R) M processor 1700MHz
+stepping        : 5
+cpu MHz         : 1700.136
+cache size      : 1024 KB
+fdiv_bug        : no
+hlt_bug         : no
+f00f_bug        : no
+coma_bug        : no
+fpu             : yes
+fpu_exception   : yes
+cpuid level     : 2
+wp              : yes
+flags           : fpu vme de pse tsc msr mce cx8 apic sep mtrr pge mca cmov
+pat clflush dts acpi mmx fxsr sse sse2 tm pbe tm2 est
+bogomips        : 3365.54