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Tilman Hausherr commented on PDFBOX-3698: ----------------------------------------- Oops! Sorry, I posted that in the wrong issue. This is meant for PDFBOX-3641. > Static Initialization Deadlock between COSNumber/COSInteger > ----------------------------------------------------------- > > Key: PDFBOX-3698 > URL: https://issues.apache.org/jira/browse/PDFBOX-3698 > Project: PDFBox > Issue Type: Bug > Affects Versions: 2.0.3 > Environment: Mac OSX 10.12.3, Java(TM) SE Runtime Environment (build > 1.8.0_25-b17) Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode) > Reporter: Sean Story > Fix For: 2.0.5, 2.1.0 > > > h3. Problem > Using Tika 1.10 (PDF Box 1.8.10) to parse PDF documents in a multi-threaded > application, processing unexpectedly halted. Investigating the output of a > {{kill -3}}, we found: > {noformat} > "pool-2-thread-18" #50 prio=5 os_prio=0 tid=0x00002af088a67000 nid=0xc9b9 in > Object.wait() [0x00002af0dc803000] > java.lang.Thread.State: RUNNABLE > at > org.apache.pdfbox.pdfparser.BaseParser.parseDirObject(BaseParser.java:1348) > x 15 > "pool-2-thread-13" #45 prio=5 os_prio=0 tid=0x00002af0cf910800 nid=0xc9b4 in > Object.wait() [0x00002af0dc2ff000] > java.lang.Thread.State: RUNNABLE > at org.apache.pdfbox.cos.COSDocument.getObjectFromPool(COSDocument.java:720) > at org.apache.pdfbox.pdfparser.PDFParser.parseObject(PDFParser.java:685) > x 2 > "pool-2-thread-11" #43 prio=5 os_prio=0 tid=0x00002af0cfba6000 nid=0xc9b2 in > Object.wait() [0x00002af0dc0fc000] > java.lang.Thread.State: RUNNABLE > at org.apache.pdfbox.cos.COSNumber.<clinit>(COSNumber.java:33) > at > org.apache.pdfbox.pdfparser.BaseParser.parseDirObject(BaseParser.java:1348) > x 1 > {noformat} > Upon further investigation, it appears that there is a risk for deadlock when > BaseParser calls {{COSNumber.get()}} and COSDocument call > {{COSInteger.get()}}. > I was able to semi-reliably replicate this issue with the below Spock test: > {noformat} > import org.apache.pdfbox.cos.COSInteger > import org.apache.pdfbox.cos.COSNumber > import spock.lang.Specification > class ThreadingIssueSpec extends Specification{ > def "testy test"(){ > setup: > Thread thread = new Thread(new Runnable(){ > @Override > void run() { > for (int i =0; i<100; i++){ > COSNumber.get("-") > } > } > }) > thread.start() > for(int i =0; i<100; i++) { > COSInteger.get("-") > } > thread.join() > expect: > 1==1 > } > } > {noformat} > (you'll likely need to run this several times before the test hangs, but it > does eventually hang) > I updated my Tika dep to 1.14 (PDF Box 2.0.3) and was still able to replicate > this issue. -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@pdfbox.apache.org For additional commands, e-mail: dev-h...@pdfbox.apache.org