Problems with "git svn clone"

I'm trying to create a git-svn repository with:

git svn clone --username=pixleyr --stdlayout --branches branches --branches branches2 svn://mumble.com/mumble/mumble

but the command dies about 11seconds in with:

         A       src/kernel/ppc/2.4.26-pre5-moto-pq3-2004_06_04-0/drivers/usb/serial/belkin_sa.h

         A       src/kernel/ppc/2.4.26-pre5-moto-pq3-2004_06_04-0/drivers/usb/serial/keyspan_usa28_fw.h

error: git-svn died of signal 11

This seems awfully early and blatant for a core dump.  What can I do to
get this running?

Initially discovered on git-2.7.4, (ubuntu-16.04), but also reproduced
on freshly built top of tree git-2.10.1.445.g3cdd5d1.

--rich



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