Same for me. Here is a backtrace from the thread which is doing it:
#0 0x00007ffff7bcd3e8 in inflate () at /lib/x86_64-linux-gnu/libz.so.1 #1 0x00007ffff7bd11d5 in uncompress () at /lib/x86_64-linux-gnu/libz.so.1 #2 0x0000000000512c38 in BtreeIndexing::BtreeIndex::readNode(unsigned int, std::vector<char, std::allocator<char> >&) () #3 0x0000000000516c37 in BtreeIndexing::BtreeIndex::findArticleLinks(QVector<BtreeIndexing::WordArticleLink>*, QSet<unsigned int>*, QSet<QString>*, QAtomicInt*) () #4 0x000000000066b0da in FtsHelpers::makeFTSIndex(BtreeIndexing::BtreeDictionary*, QAtomicInt&) () #5 0x00000000005411b8 in () #6 0x000000000065f888 in FTS::Indexing::run() () #7 0x00007ffff059ee3a in () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #8 0x00007ffff05abe6c in () at /usr/lib/x86_64-linux-gnu/libQtCore.so.4 #9 0x00007ffff031c0a4 in start_thread (arg=0x7fffddd97700) at pthread_create.c:309 #10 0x00007fffef7bf06d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
