glibc 2.25 mutex bug

[Howard Chu <hyc@symas.com>]

I spent the past few days trying to reproduce a deadlock in LMDB I've been 
seeing on a recently updated Arch Linux system. It turns out there's a bug in 
mutex locking in glibc 2.25. https://sourceware.org/bugzilla/show_bug.cgi?id=21778

Be aware, if your system has upgraded to glibc 2.25 you really need to get 
onto glib 2.26 otherwise you're going to run into a lot of mysterious hangs.

--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/