Florent Guillaume created PDFBOX-1622:
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Summary: TextNormalize init not thread-safe, may lead to infinite
loop
Key: PDFBOX-1622
URL: https://issues.apache.org/jira/browse/PDFBOX-1622
Project: PDFBox
Issue Type: Bug
Components: Utilities
Affects Versions: 1.0.0
Reporter: Florent Guillaume
Fix For: 1.8.3, 2.0.0
TextNormalize fills a static HashMap (DIACHASH) from a method
(populateDiacHash) called by the TextNormalize constructor.
If the constructor is called from two different threads at the same time, then
the HashMap may be written by two concurrent threads which may and will cause
infinite loops.
We see the CPU at 100% and jstack shows 4 threads all stuck at:
"Thread-2" prio=10 tid=0x00007f6e94499000 nid=0x347 runnable
[0x00007f6e925d6000]
java.lang.Thread.State: RUNNABLE
at java.util.HashMap.put(HashMap.java:391)
at
org.apache.pdfbox.util.TextNormalize.populateDiacHash(TextNormalize.java:82)
at org.apache.pdfbox.util.TextNormalize.<init>(TextNormalize.java:41)
at
org.apache.pdfbox.util.PDFTextStripper.<init>(PDFTextStripper.java:193)
A patch to fix this is attached, it just moves the initialization to a static
block.
Please apply to the 1.8.3 and 2.0.0 branches.
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