I just encountered what is probably the same bug trying to debootstrap an ubuntu/s390x chroot.
I: Extracting zlib1g... I: Running command: chroot /srv/chroot/bionic-s390x /debootstrap/debootstrap --second-stage qemu-s390x-static: /build/qemu-2.8+dfsg/translate-all.c:175: tb_lock: Assertion `!have_tb_lock' failed. Segmentation fault
