Ceph » CephFS

This should let you restart your mds:

diff --git a/src/mds/MDCache.cc b/src/mds/MDCache.cc
index c5d276a..65e48bf 100644
--- a/src/mds/MDCache.cc
+++ b/src/mds/MDCache.cc
@@ -5233,7 +5233,8 @@ void MDCache::_truncate_inode(CInode *in, LogSegment *ls)
           << pi->truncate_from << " -> " << pi->truncate_size
           << " on " << *in << dendl;

-  assert(pi->is_truncating());
+  if (!pi->is_truncating())
+    pi->truncate_pending++; // hack

   in->auth_pin(this);

And the fix for the actual bug is pushed to git, commit:c2889fef420611df3dd0de4064c91f6aa9f86625

Bulk updating project=ceph category=mds bugs so that I can remove the MDS category from the Ceph project to avoid confusion.