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https://issues.apache.org/jira/browse/PDFBOX-5460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17554892#comment-17554892
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Tilman Hausherr edited comment on PDFBOX-5460 at 6/16/22 4:18 PM:
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Thanks for the detailed trace. Ouch.
>From what I understand, {{getGlyph()}} is the bad actor here when it's calling
>{{getGlyphData()}} which loads the hmtx table. The data object is used for
>synchronization in two different classes, obscuring all this further. A
>solution would be to get the hmtx table first, before "data" is getting
>locked. I.e. FIRST the truetype font object, THEN then the data object, never
>the other way around.
was (Author: tilman):
Thanks for the detailed trace. Ouch.
>From what I understand, {{getGlyph()}} is the bad actor here when it's calling
>{{getGlyphData()}} which loads the hmtx table. A solution would be to get the
>hmtx table first, before "data" is getting locked. I.e. FIRST the truetype
>font object, THEN then the data object, never the other way around.
> Deadlock in TrueTypeFont and RAFDataStream
> ------------------------------------------
>
> Key: PDFBOX-5460
> URL: https://issues.apache.org/jira/browse/PDFBOX-5460
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox
> Affects Versions: 2.0.26
> Reporter: Ram Lakshmanan
> Priority: Major
> Labels: deadlock
> Fix For: 2.0.27, 3.0.0 PDFBox
>
>
> Deadlock is happening between *org.apache.fontbox.ttf.RAFDataStream* and
> *org.apache.fontbox.ttf.TrueTypeFont* objects. Below is the stack trace of
> the two threads which are in deadlock. If you want to see the complete thread
> dump you can [refer it
> here|https://fastthread.io/my-thread-report.jsp?p=c2hhcmVkLzIwMjIvMDYvMTUvLS1wZGYtYm94LWRlYWRsb2NrLnppcC0tMjItMjQtNTc=&s=t].
>
> {code:java}
> APP_Thread_50408_759_100162222_WorkerTask_1652842343227_P_Th_SPR-APP-pool-5-thread-6
> PRIORITY : 5
> THREAD ID : 0X00007F894C406000
> NATIVE ID : 0X44D1
> NATIVE ID (DECIMAL) : 17617
> STATE : BLOCKED
> stackTrace:
> java.lang.Thread.State: BLOCKED (on object monitor)
> at org.apache.fontbox.ttf.TrueTypeFont.getTable(TrueTypeFont.java:147)
> - waiting 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.text.ShowText.process(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.call(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.access$100(ParallelExecutor.java:26)
> at
> xxxxxxx.ops.executor.util.ParallelExecutor$WorkerTask.doCall(ParallelExecutor.java:164)
> at
> xxxxxxx.ops.executor.util.UserContextAwareCallable.call(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$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> APP_Thread_50408_759_100162222_WorkerTask_1652842343227_P_Th_SPR-APP-pool-5-thread-5
> PRIORITY : 5
> THREAD ID : 0X00007F894C404800
> NATIVE ID : 0X44D0
> NATIVE ID (DECIMAL) : 17616
> STATE : BLOCKED
> stackTrace:
> java.lang.Thread.State: BLOCKED (on object monitor)
> at org.apache.fontbox.ttf.TrueTypeFont.readTable(TrueTypeFont.java:356)
> - waiting 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)
> 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.text.ShowText.process(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.call(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.access$100(ParallelExecutor.java:26)
> at
> xxxxxxx.ops.executor.util.ParallelExecutor$WorkerTask.doCall(ParallelExecutor.java:164)
> at
> xxxxxxx.ops.executor.util.UserContextAwareCallable.call(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$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748) {code}
>
>
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