Troubleshooting impasse in an Apache opensource library

November 7, 2022

118

Device identified the stack hint of the 2 threads that have been in impasse. Beneath is the stack hint of these two threads:

“APP_Thread_50_WorkerTask_pool-5-thread-6” #1899 prio=5 os_prio=0 tid=0x00007f894c405555 nid=0x44d1 ready for monitor entry [0x00007f88e9c44000]

java.lang.Thread.State: BLOCKED (on object monitor)

at org.apache.fontbox.ttf.TrueTypeFont.getTable(TrueTypeFont.java:147)

– ready to lock <0x00000002d216fec8> (a org.apache.fontbox.ttf.TrueTypeFont)

at org.apache.fontbox.ttf.TrueTypeFont.getHorizontalMetrics(TrueTypeFont.java:229)

at org.apache.fontbox.ttf.GlyphTable.getGlyphData(GlyphTable.java:210)

at org.apache.fontbox.ttf.GlyphTable.getGlyph(GlyphTable.java:191)

– locked <0x00000002d218ca28> (a org.apache.fontbox.ttf.RAFDataStream)

at org.apache.fontbox.ttf.TrueTypeFont.getPath(TrueTypeFont.java:676)

at org.apache.pdfbox.pdmodel.font.PDType1Font.getPath(PDType1Font.java:638)

at org.apache.pdfbox.rendering.Type1Glyph2D.getPathForCharacterCode(Type1Glyph2D.java:83)

at org.apache.pdfbox.rendering.PageDrawer.drawGlyph2D(PageDrawer.java:495)

at org.apache.pdfbox.rendering.PageDrawer.showFontGlyph(PageDrawer.java:476)

at org.apache.pdfbox.Contentstream.PDFStreamEngine.showGlyph(PDFStreamEngine.java:787)

at org.apache.pdfbox.Contentstream.PDFStreamEngine.showGlyph(PDFStreamEngine.java:805)

at org.apache.pdfbox.Contentstream.PDFStreamEngine.showText(PDFStreamEngine.java:743)

at org.apache.pdfbox.Contentstream.PDFStreamEngine.showTextString(PDFStreamEngine.java:606)

at org.apache.pdfbox.Contentstream.operator.textual content.ShowText.course of(ShowText.java:56)

at org.apache.pdfbox.Contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:933)

at org.apache.pdfbox.Contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:514)

at org.apache.pdfbox.Contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:492)

at org.apache.pdfbox.Contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:155)

at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:277)

at org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:347)

at org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:268)

at org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:228)

at xxxxxxx.export.service.thumbnail.PDFSlideGeneratorServiceImpl$1.name(PDFSlideGeneratorServiceImpl.java:60)

at xxxxxxx.ops.executor.util.ParallelExecutorTask.doCall(ParallelExecutorTask.java:43)

at xxxxxxx.ops.executor.util.ParallelExecutor.executeTaskFromQueue(ParallelExecutor.java:154)

at xxxxxxx.ops.executor.util.ParallelExecutor.entry$100(ParallelExecutor.java:26)

at xxxxxxx.ops.executor.util.ParallelExecutor$WorkerTask.doCall(ParallelExecutor.java:164)

at xxxxxxx.ops.executor.util.UserContextAwareCallable.name(UserContextAwareCallable.java:89)

at java.util.concurrent.FutureTask.run(FutureTask.java:266)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

at java.util.concurrent.ThreadPoolExecutor$Employee.run(ThreadPoolExecutor.java:624)

at java.lang.Thread.run(Thread.java:748)

“APP_Thread_WorkerTask_APP-pool-5-thread-5” #1898 prio=5 os_prio=0 tid=0x00007f894c898900 nid=0x44d0 ready for monitor entry [0x00007f88e9d45000]

java.lang.Thread.State: BLOCKED (on object monitor)

at org.apache.fontbox.ttf.TrueTypeFont.readTable(TrueTypeFont.java:356)

– ready to lock <0x00000002d218ca28> (a org.apache.fontbox.ttf.RAFDataStream)

at org.apache.fontbox.ttf.TrueTypeFont.getTable(TrueTypeFont.java:150)

– locked <0x00000002d216fec8> (a org.apache.fontbox.ttf.TrueTypeFont)

at org.apache.fontbox.ttf.TrueTypeFont.getCmap(TrueTypeFont.java:262)

at org.apache.fontbox.ttf.TrueTypeFont.getUnicodeCmapImpl(TrueTypeFont.java:556)

at org.apache.fontbox.ttf.TrueTypeFont.getUnicodeCmapLookup(TrueTypeFont.java:541)

at org.apache.fontbox.ttf.TrueTypeFont.nameToGID(TrueTypeFont.java:629)

at org.apache.fontbox.ttf.TrueTypeFont.hasGlyph(TrueTypeFont.java:698)

at org.apache.pdfbox.pdmodel.font.PDType1Font.getNameInFont(PDType1Font.java:601)

at org.apache.pdfbox.pdmodel.font.PDType1Font.hasGlyph(PDType1Font.java:645)

at org.apache.pdfbox.rendering.Type1Glyph2D.getPathForCharacterCode(Type1Glyph2D.java:59)