[Mono-list] sgen error when using large SOAP proxy

Rodrigo Kumpera kumpera at gmail.com
Thu Sep 26 18:13:23 UTC 2013

My first suggestion is to avoid trying options that are not marked as
stable. concurrent mark and the split nursery are not. Said that, please
file a bugreport with a test
case and we'll get it fixes.

On Thu, Sep 26, 2013 at 2:07 PM, David Curylo <curylod at asme.org> wrote:

> I have an application that must load a very large SOAP proxy with hundreds
> of classes.  Under boehm GC, I'm able to load the application, but when
> running under sgen my application crashes immediately with a SIGABRT.  I'm
> able to get a stack trace under sgen to this effect:
> * Assertion: should not be reached at sgen-scan-object.h:111
> Stacktrace:
>   at <unknown> <0xffffffff>
>   at (wrapper managed-to-native)
> System.MonoCustomAttrs.GetCustomAttributesInternal
> (System.Reflection.ICustomAttributeProvider,System.Type,bool) <IL 0x0000f,
> 0xffffffff>
>   at System.MonoCustomAttrs.GetCustomAttributesBase
> (System.Reflection.ICustomAttributeProvider,System.Type,bool) [0x00019] in
> /home/abuild/rpmbuild/BUILD/mono-3.2.1/mcs/class/corlib/System/MonoCustomAttrs.cs:101
>   at System.MonoCustomAttrs.GetCustomAttributes
> (System.Reflection.ICustomAttributeProvider,bool) [0x00017] in
> /home/abuild/rpmbuild/BUILD/mono-3.2.1/mcs/class/corlib/System/MonoCustomAttrs.cs:274
>   at System.MonoType.GetCustomAttributes (bool) [0x00000] in
> /home/abuild/rpmbuild/BUILD/mono-3.2.1/mcs/class/corlib/System/MonoType.cs:573
>   at System.Xml.Serialization.XmlAttributes..ctor
> (System.Reflection.ICustomAttributeProvider) [0x00032] in
> /home/abuild/rpmbuild/BUILD/mono-3.2.1/mcs/class/System.XML/System.Xml.Serialization/XmlAttributes.cs:64
> …more of stack trace is available if you want.
> The cause seems to be that the sgen GC is having to do too much collection
> while processing the large type library.  Trying these options:
> export
> MONO_GC_PARAMS="major=marksweep-conc,minor=split,alloc-ratio=100,nursery-size=128m,max-heap-size=2048m,evacuation-threshold=0"
> seems like it would make the nursery much larger so it can handle the
> large type library.  However, doing so leads me to this error:
> Assertion at sgen-nursery-allocator.c:293, condition
> `fragment->fragment_end > fragment->fragment_start' not met
> I'm stuck at this point.  Any suggestions?
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