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free_sized() and free_aligned_sized() forward straight to sdallocx(), which expects a non-NULL pointer and asserts on it in debug builds. C23 says both should accept NULL and do nothing, like free(NULL) does, so a NULL argument either trips that assert or feeds NULL into the dealloc path in release builds. It is not hard to hit. glibc 2.41 ships free_sized()/free_aligned_sized(), and a C++ sized delete of a null pointer compiles down to a free_sized() call. Once jemalloc is preloaded its versions take over, and that NULL call takes down the process. I ran into it with GTK4/GLib apps under LD_PRELOAD. Check for NULL first, the way free() already does, and add an integration test covering the NULL case for both functions. While here, give free_aligned_sized() its own core.free_aligned_sized.entry and .exit logging and call je_sdallocx_impl() directly rather than the je_sdallocx() wrapper, so it mirrors free_sized() and no longer logs under sdallocx. The C++ sized-delete paths (sizedDeleteImpl, alignedSizedDeleteImpl) get the same treatment: log entry/exit unconditionally and guard the call with likely(ptr != nullptr).
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/