There is two issues being mixed up here

1) launchpad buildd changes.

notmuch build system appears to be confused by the new enviroment. It
appears ubuntu has chosen "armhf chroot on arm64 machine" approach,
which would mean qemu system call emulation is not involved. if it is -
it a buildd configuration error.

My suspicion is that notmuch testsuite gets confused in armhf-on-arm64
setup. This setup is a bit shoddy and launchpad should really run the
armhf builders with armhf kernel, which kvm on arm64 host can easily do.

2) The "unsupported syscall" errror.

the pbuilder-based cross-build uses qemu linux-user, so the build env is
not equivalent to what is launchpad.

syscall 384 is getrandom, which qemu does support. You may have too old

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  testsuite fails under qemu (SIGILL) works fine on real hw [missing
  getrandom 384 syscall]

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