Segfault after usage of Lucene::SnapshotDeletionPolicy snapshot / release

[alian555]

Hi,

I"ve a bug I try to spot.
I can't reproduce from a simple test now. What I see is a crash after this operation:
Lucene::SnapshotDeletionPolicy snapshot
Lucene::SnapshotDeletionPolicy release
If I close the writer now, and repopen no problem.
But If I don't close it, and delete a document, I hit an exception as soon I've a writer->commit operation:

It's like the commit work on an old list of files, already deleted so it crash when it go in deref.
#0 0x00007f8a5bff73d5 in raise () from /lib64/libc.so.6
#1 0x00007f8a5bff8858 in abort () from /lib64/libc.so.6
#2 0x00007f8a5bff02e2 in __assert_fail_base () from /lib64/libc.so.6
#3 0x00007f8a5bff0392 in __assert_fail () from /lib64/libc.so.6
#4 0x00007f8a5e63c765 in Lucene::RefCount::DecRef (this=) at /home/albert/albert/LucenePlusPlus/src/core/index/IndexFileDeleter.cpp:444
#5 0x00007f8a5e63e783 in Lucene::IndexFileDeleter::decRef (this=0x7f8a4c031fd0, fileName=...)

at /home/albert/albert/LucenePlusPlus/src/core/index/IndexFileDeleter.cpp:341

#6 0x00007f8a5e640ca6 in Lucene::IndexFileDeleter::deleteCommits (this=0x7f8a4c031fd0) at /home/albert/albert/LucenePlusPlus/src/core/index/IndexFileDeleter.cpp:181
#7 0x00007f8a5e642980 in Lucene::IndexFileDeleter::checkpoint (this=0x7f8a4c031fd0, segmentInfos=..., isCommit=)

at /home/albert/albert/LucenePlusPlus/src/core/index/IndexFileDeleter.cpp:279

#8 0x00007f8a5e6fc5b1 in Lucene::IndexWriter::finishCommit (this=0x7f8a4c02c7c0) at /home/albert/albert/LucenePlusPlus/src/core/index/IndexWriter.cpp:2216
#9 0x00007f8a5e6f65a7 in Lucene::IndexWriter::commit (this=0x7f8a4c02c7c0,

commitUserData=<error reading variable: DWARF-2 expression error: DW_OP_reg operations must be used either alone or in conjunction with DW_OP_piece or DW_OP_bit_piece.>) at /home/albert/albert/LucenePlusPlus/src/core/index/IndexWriter.cpp:2195

#10 0x00007f8a5e6fae76 in Lucene::IndexWriter::commit (this=0x4d0f) at /home/albert/albert/LucenePlusPlus/src/core/index/IndexWriter.cpp:2170

If I do the same without snapshot / release of course no problem. Any clue ?

Thanks !

[alian555]

Ok I found from where it's come, not sure it's a bug ... As the snapshot() method never give "segments.gen", I add it to my method:

bool BaseLucene::Snapshot( Lucene::HashSet< Lucene::String > &files) {
Lucene::SnapshotDeletionPolicyPtr pol = _writer_acces[_dbname].pol;
Lucene::IndexCommitPtr commit = pol->snapshot();
files = commit->getFileNames();
files.add(Lucene::String(L"segments.gen"));
return true;
}

But on the next commit of lucene, it will try to decRef this "segments.gen" and of course crash ... files is not a copy, but a pointer, so if I update files, I update in the same time the list of commit.