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c68b7b1cac
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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| INSTALL.md | ||
| jemalloc.pc.in | ||
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| README | ||
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| TUNING.md | ||
jemalloc is a general purpose malloc(3) implementation that emphasizes fragmentation avoidance and scalable concurrency support. jemalloc first came into use as the FreeBSD libc allocator in 2005, and since then it has found its way into numerous applications that rely on its predictable behavior. In 2010 jemalloc development efforts broadened to include developer support features such as heap profiling and extensive monitoring/tuning hooks. Modern jemalloc releases continue to be integrated back into FreeBSD, and therefore versatility remains critical. Ongoing development efforts trend toward making jemalloc among the best allocators for a broad range of demanding applications, and eliminating/mitigating weaknesses that have practical repercussions for real world applications. The COPYING file contains copyright and licensing information. The INSTALL file contains information on how to configure, build, and install jemalloc. The ChangeLog file contains a brief summary of changes for each release. URL: https://jemalloc.net/