Segfault in writing out XML with master

from dolfin import *

mesh = UnitSquareMesh(100, 100)
V = VectorFunctionSpace(mesh, "CG", 2)
P = FunctionSpace(mesh, "CG", 1)
Z = MixedFunctionSpace([V, P])

z = Function(Z)
File("example.xml") << z

segfaults on two processors with master:

[pef@aislinn:/tmp]$ python dump.py 
[pef@aislinn:/tmp]$ mpiexec -n 2 python dump.py 
Number of global vertices: 10201
Number of global cells: 20000
--------------------------------------------------------------------------
mpiexec noticed that process rank 0 with PID 22901 on node aislinn exited on signal 11 (Segmentation fault).
--------------------------------------------------------------------------

Something to do with the recent dofmap changes? A backtrace:

Program received signal SIGSEGV, Segmentation fault.
0x00007fffdf2ad93a in dolfin::XMLFunctionData::write (u=..., xml_node=...)
    at /home/pef/local/fenics-dbg-20140817/src/dolfin/dolfin/io/XMLFunctionData.cpp:190
190             = (unsigned int) global_dof_to_cell_dof[i][0].first;
(gdb) bt
#0  0x00007fffdf2ad93a in dolfin::XMLFunctionData::write (u=..., xml_node=...)
    at /home/pef/local/fenics-dbg-20140817/src/dolfin/dolfin/io/XMLFunctionData.cpp:190
#1  0x00007fffdf27db1d in dolfin::XMLFile::operator<< (this=0x31c0560, 
    output=...)
    at /home/pef/local/fenics-dbg-20140817/src/dolfin/dolfin/io/XMLFile.cpp:240
#2  0x00007fffb67913a9 in dolfin::File::operator<< <dolfin::Function> (
    this=0x31bc170, t=...)
    at /home/pef/local/fenics-dbg-20140817/src/dolfin/dolfin/io/File.h:234
#3  0x00007fffb676e41f in _wrap_File___lshift____SWIG_20 (nobjs=2, 
    swig_obj=0x7fffffffcf70)
    at /home/pef/local/fenics-dbg-20140817/src/dolfin/build.master/dolfin/swig/modules/io/modulePYTHON_wrap.cxx:21665

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