[Mono-bugs] [Bug 485377] New: Regression in Convert.ChangeType()

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=485377


           Summary: Regression in Convert.ChangeType()
    Classification: Mono
           Product: Mono: Runtime
           Version: SVN
          Platform: x86-64
        OS/Version: openSUSE 11.1
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: JIT
        AssignedTo: lupus at novell.com
        ReportedBy: jpryor at novell.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


There is a regression in Systme.Convert.ChangeType().  It used to throw an
InvalidCastException when converting to an unsupported type.  Now, it
segfaults.

Source:

  using System;

  struct Foo {}

  class Test
  {
    public static void Main ()
    {
      Foo f = (Foo) Convert.ChangeType ("some-random-string", typeof (Foo));
    }
  }

Execute:

  gmcs foo.cs
  mono foo.exe

Expected Results (as per Mono 2.0.1, with openSUSE 11.1):

Unhandled Exception: System.InvalidCastException: Unknown target convertion
type from System.String to Foo
  at System.Convert.ToType (System.Object value, System.Type conversionType,
IFormatProvider provider) [0x00000] 
  at System.Convert.ChangeType (System.Object value, System.Type
conversionType) [0x00000] 
  at Test.Main () [0x00000] 

Actual Results:

Segmentation fault

..which isn't very useful.  So run within gdb, and the `t a a bt' output:

Program received signal SIGSEGV, Segmentation fault.
0x0000000040012ff7 in ?? ()
(gdb) t a a bt

Thread 4 (Thread 0x7ffff5c70950 (LWP 4584)):
#0  0x00007ffff72f9c71 in sem_wait () from /lib64/libpthread.so.0
#1  0x0000000000534a7a in finalizer_thread (unused=<value optimized out>)
    at gc.c:1077
#2  0x0000000000518153 in start_wrapper (data=<value optimized out>)
    at threads.c:624
#3  0x0000000000574c3b in thread_start_routine (args=0x8ed680) at threads.c:286
#4  0x000000000058df3e in GC_start_routine (arg=0x7ffff7e8be70)
    at pthread_support.c:1382
#5  0x00007ffff72f4070 in start_thread () from /lib64/libpthread.so.0
#6  0x00007ffff6e1110d in clone () from /lib64/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7ffff7e2a950 (LWP 4583)):
#0  0x00007ffff72fb1b1 in nanosleep () from /lib64/libpthread.so.0
#1  0x000000000057c002 in collection_thread (unused=<value optimized out>)
    at collection.c:34
#2  0x00007ffff72f4070 in start_thread () from /lib64/libpthread.so.0
#3  0x00007ffff6e1110d in clone () from /lib64/libc.so.6
#4  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7ffff6b0d950 (LWP 4582)):
#0  0x00007ffff72f7d59 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib64/libpthread.so.0
#1  0x000000000058e2ab in GC_wait_marker () at pthread_support.c:1777
#2  0x00000000005939f0 in GC_help_marker (my_mark_no=2) at mark.c:1116
#3  0x000000000058cff8 in GC_mark_thread (id=0x0) at pthread_support.c:548
#4  0x00007ffff72f4070 in start_thread () from /lib64/libpthread.so.0
#5  0x00007ffff6e1110d in clone () from /lib64/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (LWP 4581):
#0  0x0000000040012ff7 in ?? ()
Cannot access memory at address 0x7fffff808f90

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