Hi, this is Mercurial 1.8.4 and Subversion server 1.6.15 on Linux. I filed 805784 (https://bugs.launchpad.net/subvertpy/+bug/805784) on Subvertpy tracker but it seems like it's happening due to something hgsubversion does. Full stack trace is on Subvertpy tracker at the URL above. I'll get the exact hgsubversion version.
AssertionError("%d != %d" % (len(tview), tview_len)) in delta.py, line 57, in apply_txdelta_window