Created attachment 91054 [details] gdb backtrace of the deadlock in the RDF codebase. When calling Mailmerge via UNO, there is a high chance to deadlock LO when the MM job is finished or canceled. When this happens, LO deadlocks in the RDF library code (see attachment). I didn't check if there are similar problems when running MM from within LO itself.
Another one that has a nice gdb backtrace but we need experts to investigate.
Michael Stahl committed a patch related to this issue. It has been pushed to "master": http://cgit.freedesktop.org/libreoffice/core/commit/?id=7db6b2f7968d8063b12312737136f09cb7549805 fdo#72928: fix deadlocks in librdf_Repository The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.
should be fixed on master
Michael Stahl committed a patch related to this issue. It has been pushed to "libreoffice-4-2": http://cgit.freedesktop.org/libreoffice/core/commit/?id=f2394e4c9cd7a27a1eb1e0e2476997fd18ae2508&h=libreoffice-4-2 fdo#72928: fix deadlocks in librdf_Repository It will be available in LibreOffice 4.2.1. The patch should be included in the daily builds available at http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More information about daily builds can be found at: http://wiki.documentfoundation.org/Testing_Daily_Builds Affected users are encouraged to test the fix and report feedback.