libc_r not functional with new malloc

I think the new malloc broke libc_r.  Running firefox, I get this:

% firefox3
Fatal error 'Cannot allocate red zone for initial thread' at line ? in=20
file /usr/src/lib/libc_r/uthread/uthread_init.c (errno =3D ?)
zsh: abort      firefox3

cheers
   simon

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