Segfault in createFilter()
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Description
I'm getting segfaults with leveldb 1.19. This is in code that has been working perfectly for more than a year with 1.18. The segfault happens some time during shutdown and looks like a race condition. Valgrind has this to say:
http://pastebin.ubuntu.com/23459626/
gdb shows this stack trace:
http://pastebin.ubuntu.com/23459624/
I can produce the segfault on arm64, amd64, powerpc, s390x, ppc64el, armhf, and i386 simply by changing from libleveldb.so.1.18 to libleveldb.so.1.19
More details here: https://bugs.launchpad.net/ubuntu/+source/thumbnailer/+bug/1640326
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