Hm, I wonder whether this is actually a unionfs bug:

Sep 22 11:46:00 ubuntu kernel: [   93.022707] __open_dir: branch 0 
lower_mnt_idx NULL! Set to ffff81002fe73c00
Sep 22 11:46:00 ubuntu kernel: [   93.022733] __open_dir: opened 
ffff8100278989c0, autostart
Sep 22 11:46:00 ubuntu kernel: [   93.022736] __open_dir: branches bstart 0, 
bend 1
Sep 22 11:46:00 ubuntu kernel: [   93.022741] __open_dir: 0: lower_dentry 
ffff8100278984e0, autostart, mntpoint ffff81002fe73c00
Sep 22 11:46:00 ubuntu kernel: [   93.022746] __open_dir: 1: lower_dentry 
ffff8100278984e0, autostart, mntpoint ffff81002fe91700
[...]
Sep 22 11:48:33 ubuntu kernel: [  244.745543] unionfs: error creating directory 
tree for rename, bindex = 1, err = -30
Sep 22 11:48:33 ubuntu kernel: [  244.776534] unionfs: error creating directory 
tree for rename, bindex = 1, err = -30

Attaching complete kern.log for completeness.

** Attachment added: "kern.log"
   http://launchpadlibrarian.net/9462596/kern.log

-- 
crashes with SystemError: E:Unable to write mmap - msync
https://bugs.launchpad.net/bugs/144001
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