LESS compiler stuck in loop

[cfmlrocksmysocks]

After performing a fresh install of Mura 6.1, which uses cfstatic, three requests end up running for over 10 minutes when I try to access the Mura admin. The server shows these requests are causing CF to use up to 75% CPU. Stack traces show something within cfstatic is creating the load on the server:

 at org.mozilla.javascript.regexp.NativeRegExp.simpleMatch(NativeRegExp.java:1909)
    at org.mozilla.javascript.regexp.NativeRegExp.executeREBytecode(NativeRegExp.java:1992)
    at org.mozilla.javascript.regexp.NativeRegExp.matchRegExp(NativeRegExp.java:2381)
    at org.mozilla.javascript.regexp.NativeRegExp.executeRegExp(NativeRegExp.java:2412)
    at org.mozilla.javascript.regexp.NativeRegExp.execSub(NativeRegExp.java:269)
    at org.mozilla.javascript.regexp.NativeRegExp.execIdCall(NativeRegExp.java:2684)
    at org.mozilla.javascript.IdFunctionObject.call(IdFunctionObject.java:97)
    at org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:1473)
    at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:815)
    at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:109)
    at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:394)
    at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3091)
    at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:107)
    at org.mozilla.javascript.Context$1.run(Context.java:478)
    at org.mozilla.javascript.Context.call(Context.java:489)
    at org.mozilla.javascript.Context.call(Context.java:476)
    at com.asual.lesscss.LessEngine.call(LessEngine.java:205)
    at com.asual.lesscss.LessEngine.compile(LessEngine.java:174)
    at com.asual.lesscss.LessEngine.compile(LessEngine.java:165)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at sun.reflect.GeneratedMethodAccessor1477.invoke(null:-1)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at coldfusion.runtime.StructBean.invoke(StructBean.java:508)
    at coldfusion.runtime.CfJspPage._invoke(CfJspPage.java:2465)
    at cfJavaProxy2ecfc913132690$funcONMISSINGMETHOD.runFunction(D:\home\testsite.com\wwwroot\requirements\org\cfstatic\lib\javaloader\JavaProxy.cfc:94)
    at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:472)
    at coldfusion.filter.SilentFilter.invoke(SilentFilter.java:47)
    at coldfusion.runtime.UDFMethod$ReturnTypeFilter.invoke(UDFMethod.java:405)
    at coldfusion.runtime.UDFMethod$ArgumentCollectionFilter.invoke(UDFMethod.java:368)
    at coldfusion.filter.FunctionAccessFilter.invoke(FunctionAccessFilter.java:55)
    at coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:321)
    at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:280)
    at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:676)
    at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:444)
    at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:414)
    at coldfusion.runtime.CfJspPage._invoke(CfJspPage.java:2432)
    at cfLessCompiler2ecfc1066826494$funcCOMPILE.runFunction(D:\home\testsite.com\wwwroot\requirements\org\cfstatic\util\LessCompiler.cfc:31)
    at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:472)
    at coldfusion.filter.SilentFilter.invoke(SilentFilter.java:47)
    at coldfusion.runtime.UDFMethod$ReturnTypeFilter.invoke(UDFMethod.java:405)
    at coldfusion.runtime.UDFMethod$ArgumentCollectionFilter.invoke(UDFMethod.java:368)
    at coldfusion.filter.FunctionAccessFilter.invoke(FunctionAccessFilter.java:55)
    at coldfusion.runtime.UDFMethod.runFilterChain(UDFMethod.java:321)
    at coldfusion.runtime.UDFMethod.invoke(UDFMethod.java:220)
    at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:655)
    at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:444)
    at coldfusion.runtime.TemplateProxy.invoke(TemplateProxy.java:414)
    at coldfusion.runtime.CfJspPage._invoke(CfJspPage.java:2432)
    at cfCfStatic2ecfc20751721$func_COMPILELESS.runFunction(D:\home\testsite.com\wwwroot\requirements\org\cfstatic\CfStatic.cfc:586)

For your reference, the 'hung' requests are to the following URLs (on a local test site):

• testsite.com/index.cfm
• testsite.com/index.cfm
• testsite.com/index.cfm/admin/images/favicon.ico

The only way to kill the threads is via a CF restart, which would be nice to avoid. Let me know if you need more info.

This was posted on Mura's Github page (https://github.com/blueriver/MuraCMS/issues/1470) earlier, but it was recommended that I post over here too.

[DominicWatson]

Thanks for this Jake, that sounds like a nightmare. I'm really pushed to look into this at the moment but have some plans that will hopefully change that very soon.