Okay, it's a race of some kind:

awilcox on gwyn [pts/7 Fri 7 13:12] musl: lib/libc.so
musl libc (powerpc64)
Version 1.1.20-git-156-gb1c58cb9
Dynamic Program Loader
Usage: lib/libc.so [options] [--] pathname [args]
awilcox on gwyn [pts/7 Fri 7 13:12] musl: lib/libc.so ~/aioWrite

zsh: segmentation fault  lib/libc.so ~/aioWrite
awilcox on gwyn [pts/7 Fri 7 13:12] musl: lib/libc.so ~/aioWrite
zsh: segmentation fault  lib/libc.so ~/aioWrite
awilcox on gwyn [pts/7 Fri 7 13:12] musl: lib/libc.so ~/aioWrite
zsh: segmentation fault  lib/libc.so ~/aioWrite
awilcox on gwyn [pts/7 Fri 7 13:12] musl: lib/libc.so ~/aioWrite
zsh: segmentation fault  lib/libc.so ~/aioWrite
awilcox on gwyn [pts/7 Fri 7 13:12] musl: lib/libc.so ~/aioWrite
zsh: segmentation fault  lib/libc.so ~/aioWrite
awilcox on gwyn [pts/7 Fri 7 13:12] musl: lib/libc.so ~/aioWrite
zsh: segmentation fault  lib/libc.so ~/aioWrite
awilcox on gwyn [pts/7 Fri 7 13:12] musl: lib/libc.so ~/aioWrite
aio_write/1-1.c cancelationStatus : 2
Test PASSED
awilcox on gwyn [pts/7 Fri 7 13:12] musl: lib/libc.so ~/aioWrite
zsh: segmentation fault  lib/libc.so ~/aioWrite


So, my best theory is that running inside a debugger (gdb, valgrind)
makes it slow enough that it no longer races.

Best,
--arw


-- 
A. Wilcox (awilfox)
Project Lead, Adélie Linux
https://www.adelielinux.org