Details
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Bug
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Resolution: Cannot Reproduce
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Major
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None
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6.2.2
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Unknown
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N/A
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N/A
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Description
xwiki.org crashing very often seems to be caused by less builder ending up locked by itself or some threads locking each other.
See the related thread dump and especially:
"http://www.xwiki.org/xwiki/bin/ssx/XWiki/XWikiOrgSkinExtension?language=en&colorTheme=test%3AColorThemes.TestCT" daemon prio=10 tid=0x0000000003713000 nid=0x25ad waiting for monitor entry [0x00007f3c90faf000] java.lang.Thread.State: BLOCKED (on object monitor) at org.xwiki.lesscss.internal.AbstractCachedCompiler.compileFromSkinFile(AbstractCachedCompiler.java:112) - waiting to lock <0x00000000af3639a8> (a java.lang.Object) at org.xwiki.lesscss.internal.DefaultLESSSkinFileCompiler.compileSkinFile(DefaultLESSSkinFileCompiler.java:140) at org.xwiki.lesscss.internal.DefaultLESSColorThemeConverter.compile(DefaultLESSColorThemeConverter.java:94) at org.xwiki.lesscss.internal.DefaultLESSColorThemeConverter.compile(DefaultLESSColorThemeConverter.java:42) at org.xwiki.lesscss.internal.AbstractCachedCompiler.compileFromSkinFile(AbstractCachedCompiler.java:120) - locked <0x00000000af0c2068> (a java.lang.Object) at org.xwiki.lesscss.internal.AbstractCachedCompiler.compileFromSkinFile(AbstractCachedCompiler.java:76) at org.xwiki.lesscss.internal.DefaultLESSColorThemeConverter.getColorThemeFromSkinFile(DefaultLESSColorThemeConverter.java:63) at org.xwiki.lesscss.LessCompilerScriptService.getColorThemeFromSkinFile(LessCompilerScriptService.java:133) at sun.reflect.GeneratedMethodAccessor324.invoke(Unknown Source) ... "http://www.xwiki.org/xwiki/bin/skin/XWikiOrgCode/Skin/style.css?skin=xwiki%3AXWikiOrgCode.Skin&colorTheme=test%3AColorThemes.TestCT" daemon prio=10 tid=0x000000000476f800 nid=0x4c11 runnable [0x00007f3c92dc9000] java.lang.Thread.State: RUNNABLE at org.mozilla.javascript.ScriptRuntime.toObjectOrNull(ScriptRuntime.java:958) at org.mozilla.javascript.ScriptRuntime.getObjectProp(ScriptRuntime.java:1481) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_552(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:7065) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:42) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_550(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:7017) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.ScriptRuntime.applyOrCall(ScriptRuntime.java:2430) at org.mozilla.javascript.BaseFunction.execIdCall(BaseFunction.java:269) at org.mozilla.javascript.IdFunctionObject.call(IdFunctionObject.java:97) at org.mozilla.javascript.optimizer.OptRuntime.callN(OptRuntime.java:52) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_483(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6303) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_484(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6329) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_414(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:5275) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_483(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6310) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_484(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6329) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_414(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:5275) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_483(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6310) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_484(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6329) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_414(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:5275) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_483(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6310) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_484(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6329) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_414(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:5275) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_483(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6310) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_484(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6329) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_414(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:5275) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_483(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6310) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_484(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6329) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_414(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:5275) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_483(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6310) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_484(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6329) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_414(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:5275) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_483(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6310) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_544(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6900) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_43(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:730) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_671(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:9750) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.callName(OptRuntime.java:63) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_45(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:821) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_488(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:6409) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_38(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:826) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call2(OptRuntime.java:42) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_anonymous_665(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:9745) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.optimizer.OptRuntime.call1(OptRuntime.java:32) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23._c_script_0(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js:9464) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:394) at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3091) at org.mozilla.javascript.gen.jar_file__usr_local_xwiki_enterprise_web_6_2_2_WEB_INF_lib_xwiki_platform_lesscss_default_6_2_2_jar__less_rhino_1_7_0_js_23.call(jar:file:/usr/local/xwiki-enterprise-web-6.2.2/WEB-INF/lib/xwiki-platform-lesscss-default-6.2.2.jar!/less-rhino-1.7.0.js) at org.lesscss.LessCompiler.compile(LessCompiler.java:383) - locked <0x00000000ccfc87b0> (a org.lesscss.LessCompiler) at org.lesscss.LessCompiler.compile(LessCompiler.java:330) at org.lesscss.LessCompiler.compile(LessCompiler.java:312) at org.xwiki.lesscss.internal.DefaultLESSCompiler.compile(DefaultLESSCompiler.java:95) at org.xwiki.lesscss.internal.DefaultLESSSkinFileCompiler.compile(DefaultLESSSkinFileCompiler.java:120) at org.xwiki.lesscss.internal.DefaultLESSSkinFileCompiler.compile(DefaultLESSSkinFileCompiler.java:58) at org.xwiki.lesscss.internal.AbstractCachedCompiler.compileFromSkinFile(AbstractCachedCompiler.java:120) - locked <0x00000000af3639a8> (a java.lang.Object) at org.xwiki.lesscss.internal.AbstractCachedCompiler.compileFromSkinFile(AbstractCachedCompiler.java:76) at org.xwiki.lesscss.internal.DefaultLESSSkinFileCompiler.compileSkinFile(DefaultLESSSkinFileCompiler.java:134) at org.xwiki.lesscss.LessCompilerScriptService.compileSkinFile(LessCompilerScriptService.java:85) at org.xwiki.lesscss.LessCompilerScriptService.compileSkinFile(LessCompilerScriptService.java:70) at sun.reflect.GeneratedMethodAccessor730.invoke(Unknown Source) ...
which is locking most of the other thread and is itself locked a few lines after in the same place by itself (not itself as the same thread by itself as another thread having a lock in the same place).
Note that the wiki have been working for 6h before getting stuck so that also seems to indicate that the cache "lost" the LESS build result and recreated it for some reason.