[Mono-bugs] [Bug 667921] New: [Dynamic methods] Crash with multi-threaded linq

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https://bugzilla.novell.com/show_bug.cgi?id=667921

https://bugzilla.novell.com/show_bug.cgi?id=667921#c0


           Summary: [Dynamic methods] Crash with multi-threaded linq
    Classification: Mono
           Product: Mono: Runtime
           Version: SVN
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: misc
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: rkvinge at novell.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


Created an attachment (id=410990)
 --> (http://bugzilla.novell.com/attachment.cgi?id=410990)
test case

Compile the attached test case with dmcs and run.

It should print a list of SUCCESS #[0..19]/20 until it exits.

I do however get a pretty random behaviour, which includes:

SIGSEGV
SIGILL
SIGTRAP
SIGABRT
ExecutionEngineExceptions
NullReferenceExceptions
InvalidCastExceptions
IndexOutOfRangeExceptions
deadlocks
infinite recursions

and of course it does actually work correctly once in a while too.

Note that all those exceptions terminate the process, even if there is a
exception handler in the main method and all threads.

It seems to be because dynamic methods are freed too early, if I make
mono_reflection_destroy_dynamic_method in reflection.c a nop (return
immediately), the test case works correctly. It also works with GC_DONT_GC=1.

This test case only seems to crash with boehm, not sgen. However an earlier
(and a lot bigger) version of the test case usually caused an infinite loop in
sgen, so the bug is likely not limited to boehm.

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