A design flaw was found in the file extended attribute handling of the linux kernels handling of cached attributes. Too many entries in the cache cause a soft lockup while attempting to iterate the cache and access relevant locks.
Upstream has replaced the mbcache code with an updated version which was not a patch but a clear-cut reimplentation of the code.
Bugzilla kernel submission:
Red Hat would like to thank Laurent Guerby for bringing this to our attention.
This issue does not affect any shiping version of Red Hat Enterprise Linux.
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1368919]