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Date: Tue, 4 Aug 2020 11:50:04 -0400
From: Rich Felker <>
Subject: musl 1.2.1 released

This release features the new "mallocng" malloc implementation,
replacing musl's original dlmalloc-like allocator that suffered from
fundamental design problems. Its major user-facing new properties are
the ability to return freed memory on a much finer granularity and
avoidance of many catastrophic fragmentation patterns. In addition it
provides strong hardening against memory usage errors by the caller,
including detection of overflows, double-free, and use-after-free, and
does not admit corruption of allocator state via these errors.

Other enhancements in this release include changes to the res_* API to
report DNSSEC status of the results (needed for correct implementation
of DANE in applications) and new arch-specific optimized string and
math functions, especially memcpy and memset for AAarch64.

A major logic/synchronization error in lock skipping after a
multi-threaded process returns to single-threaded state has been
fixed, along with a number of lesser bugs, including some
time64-related regressions on 32-bit archs. One of these was actually
a kernel vdso bug that broke clock_gettime on arm on hardware where
the vdso should not be used; as a result, arm vdso support has been
disabled until there is a reliable and inexpensive way to detect
whether it's safe to use. Bugs and recent regressions affecting all
mips archs and other arch-specific bugs have also been fixed.

Special thanks to musl's release sponsors who have supported the
project financially over this release cycle via Patreon and GitHub
Sponsors at the $32/month level:

* Justin Cormack
* Nathan Hoad
* Jeremiah Gowdy
* Mirza Prasovic
* Hurricane Labs (
* Les Aker
* Neal Gompa
* The Midipix Project (
* Laurent Bercot
* Michael Forney
* Andrew Kelley / ziglang
* Bartosz Brachaczek
* Noel Cower
* Evan Phoenix
* Jonny

For information on becoming a sponsor, visit one of:

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