On Tue, 30 May 2023 08:31:08 GMT, SUN Guoyun <[email protected]> wrote:
> command: make test CONF=fastdebug JTREG="VM_OPTIONS=-Xcomp"
> TEST=gc/TestAllocHumongousFragment.java
> error info:
>
> Caused by: java.lang.NullPointerException: Cannot invoke
> "sun.util.locale.BaseLocale.getVariant()" because "base" is null
> at java.base/java.util.Locale.forLanguageTag(Locale.java:1802)
> at
> java.base/sun.util.cldr.CLDRBaseLocaleDataMetaInfo.<clinit>(CLDRBaseLocaleDataMetaInfo.java:41)
> ... 24 more
>
> Note that the test runs with -XX:ShenandoahGCHeuristics=aggressive
> -XX:+ShenandoahOOMDuringEvacALot and SoftReferences are involved
> (LocaleObjectCache uses SoftReferences, used by printf method called in
> getRandomInstance(Utils.java:511)).
>
> Maybe we have to deal with the case where the getBaseLocale() return value is
> null. the call stack is:
>
> at
> java.base/sun.util.locale.LocaleObjectCache.get(LocaleObjectCache.java:64)
> at java.base/sun.util.locale.BaseLocale.getInstance(BaseLocale.java:169)
> at
> java.base/sun.util.locale.InternalLocaleBuilder.getBaseLocale(InternalLocaleBuilder.java:524)
> at java.base/java.util.Locale.forLanguageTag(Locale.java:1874)
>
> in LocaleObjectCache.java:64
>
> 62 if (key == null || newVal == null) {
>
> 63 // subclass must return non-null key/value object
>
> 64 return null; // run here
> 65 }
Jtreg tier1 can trigger the same error with vmoptions:"-Xcomp
-XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
-XX:+ShenandoahOOMDuringEvacALot
I found the GC occurs between when the soft reference is assigned and when it
is used.
<pre><code class="shell">
private BaseLocale getBaseLocale() {
- return (holder == null) ? holderRef.get() : holder;
+// return (holder == null) ? holderRef.get() : holder;
+ if (holder == null) {
+ System.out.println("getBaseLocale this=" + this + "
SoftReference=" + holderRef.get()); // null
+ return holderRef.get();
+ } else {
+ System.out.println("getBaseLocale return holder");
+ return holder;
+ }
}
</code></pre>
The following modification verifies this.
<pre><code class="shell">
--- a/src/java.base/share/classes/sun/util/locale/BaseLocale.java
+++ b/src/java.base/share/classes/sun/util/locale/BaseLocale.java
@@ -257,19 +261,21 @@ public final class BaseLocale {
private final boolean normalized;
private final int hash;
-
+ private BaseLocale locale; // make locale to a member variable
private Key(String language, String script, String region,
String variant, boolean normalize) {
- BaseLocale locale = new BaseLocale(language, script, region,
variant, normalize);
+ locale = new BaseLocale(language, script, region, variant,
normalize);
this.normalized = normalize;
</code></pre>
But this should not be a reasonable solution. I think I should to find a better
solution.
-------------
PR Comment: https://git.openjdk.org/jdk/pull/14211#issuecomment-1569881913
