[Mono-bugs] [Bug 541194] New: mono_image_close causes sigsegv on some multi-core systems

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http://bugzilla.novell.com/show_bug.cgi?id=541194


           Summary: mono_image_close causes sigsegv on some multi-core
                    systems
    Classification: Mono
           Product: Mono: Runtime
           Version: unspecified
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: misc
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: christian.hergert at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US;
rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3

There seems to be a race condition in mono_image_close().  Leaking memory and
returning right away seems to prevent mono from crashing.

Below is a stack trace of the issue exemplified by MonoDevelop which uses
Assembly.GetAssemblyName() pretty heavily now.

Attached is a gdb backtrace of all threads.

Reproducible: Sometimes

Steps to Reproduce:
1. Start a program that does lots of assembly opening and let the refcount fall
to 0 on a multi-core box. The more cores the better.
2. Repeat until it happens. Perhaps hellgrind can be of some use.

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