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One of the condition to start purging is `hpa_hugify_blocked_by_ndirty` function call returns true. This can happen in cases where we have no dirty memory for this shard at all. In this case purging loop will be an infinite loop. `hpa_hugify_blocked_by_ndirty` was introduced at0f6c420, but at that time purging loop has different form and additional `break` was not required. Purging loop form was re-written at6630c5989, but additional exit condition wasn't added there at the time. Repo code was shared by Patrik Dokoupil at [1], I stripped it down to minimum to reproduce issue in jemalloc unit tests. [1]: https://github.com/jemalloc/jemalloc/pull/2533
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/