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Exercises the tsd thread-pointer hoisting bug: ucontext fibers do free/swapcontext/malloc in one frame on a worker pool, so a fiber routinely resumes on a different OS thread; under whole-program LTO the inlined fastpath then frees/allocs against the previous thread's tcache and crashes. It is a standalone program (no test harness, so it can be static-linked without symbol clashes), calling jemalloc via JEMALLOC_MANGLE and linked statically with --whole-archive so the allocator inlines next to the swapcontext. Built only when -flto is in the build flags -- without LTO the allocator is not inlined and the bug cannot reproduce, so the test would be a meaningless always-pass -- and gated on ELF + static + have_ucontext (a configure link test, since musl declares but does not implement getcontext/makecontext/swapcontext). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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| stress | ||
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| test.sh.in | ||