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cc -std=gnu99 -D_BSD_SOURCE -ggdb3 -O2 -Wall -DEXPORT_UNPREFIXED -Iinclude -Iarch/x86 -Iarch/common test_libucontext_posix.c -o test_libucontext_posix -L. -lucontext
env LD_LIBRARY_PATH=/root/libucontext ./test_libucontext_posix
setting up context 1
setting up context 2
doing initial swapcontext
start f2
swap to f1
start f1
checking provided arguments to function f1
looks like all arguments are passed correctly
swap back to f2
finish f2, should swap to f1
make: *** [Makefile:181: check_libucontext_posix] Segmentation fault

Bisected: https://github.com/kaniini/libucontext/commit/388edbe12138e8300e230e2bc9c08a8f273e98d9