file UCP: Dir entries can disappear during non-atomic traversal

Desktop / LibreOffice - Stephan Bergmann [] - 19 April 2017 08:06 EDT allow for that by reporting failure to call osl::DirectoryItem::getFileStatus from TaskManager::getv, and make XResultSet_impl::OneMore ignore such lost entries. While there may be legitimate cases where getFileStatus in getv would fail (and thus SAL_INFO would be more appropriate), the broken, non-atomic design means that such failure is likely unexpected (and worth a SAL_WARN).

Occasionally ran into this when building UBSan builds, which sometimes failed in one of the extras/Gallery_*.mk like

> ucb/source/ucp/file/filrset.cxx:235:60: runtime error: load of value 96, which is not a valid value for type 'bool' > #0 0x7f079bff575e in fileaccess::XResultSet_impl::OneMore() ucb/source/ucp/file/filrset.cxx:234:60 > #1 0x7f079bff823e in fileaccess::XResultSet_impl::next() ucb/source/ucp/file/filrset.cxx:288:16 > #2 0x7f0800a109a8 in Gallery::ImplLoadSubDirs(INetURLObject const&, bool&) svx/source/gallery2/gallery1.cxx:291:36 > #3 0x7f0800a0c88c in Gallery::ImplLoad(rtl::OUString const&) svx/source/gallery2/gallery1.cxx:202:5 > #4 0x7f0800a0bfa5 in Gallery::Gallery(rtl::OUString const&) svx/source/gallery2/gallery1.cxx:167:5 > #5 0x522e13 in createGallery(rtl::OUString const&) svx/source/gengal/gengal.cxx:62:16 > #6 0x52979a in createTheme(rtl::OUString const&, rtl::OUString const&, rtl::OUString const&, std::__debug::vector >&, bool) svx/source/gengal/gengal.cxx:76:16 > #7 0x52853d in GalApp::Main() svx/source/gengal/gengal.cxx:318:9 > #8 0x7f080f6f8c36 in ImplSVMain() vcl/source/app/svmain.cxx:191:35 > #9 0x7f080f706571 in SVMain() vcl/source/app/svmain.cxx:229:16 > #10 0x56aa0a in sal_main() vcl/source/salmain/salmain.cxx:41:12 > #11 0x56a99f in main vcl/source/salmain/salmain.cxx:35:1 > #12 0x7f07fbaf5400 in __libc_start_main /usr/src/debug/glibc-2.24-33-ge9e69e4/csu/../csu/libc-start.c:289 > #13 0x42e219 in _start (instdir/program/gengal.bin+0x42e219) > > SUMMARY: AddressSanitizer: undefined-behavior ucb/source/ucp/file/filrset.cxx:235:60 in > solenv/gbuild/ recipe for target 'workdir/Gallery/education.done' failed

presumably because some other part of the build changed instdir/share/config/ in parallel. (And doing

> while (touch instdir/share/config/TEST && rm instdir/share/config/TEST); do :; done

in parallel to 'make extras' indeed causes this issue to occur easily.)

f0110f7 file UCP: Dir entries can disappear during non-atomic traversal
ucb/source/ucp/file/filrset.cxx | 10 ++++-
ucb/source/ucp/file/filtask.cxx | 88 ++++++++++++++++++++++-------------------
ucb/source/ucp/file/filtask.hxx | 5 ++-
3 files changed, 59 insertions(+), 44 deletions(-)


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