These releases fix a regression in libjpeg-turbo 2.1.5 and 3.0 beta1 that caused an illegal instruction error on older x86 CPUs without AVX2 instructions if jpeg_start_*compress() was called in one thread and jpeg_read_*() or jpeg_write_*() was called with the same libjpeg instance in another thread. This issue was known to affect Chromium and libvips. Note that the error could also be worked around on affected systems by setting JSIMD_FORCESSE2=1 in the environment.

2.1.5.1:

Binaries and source tarball are here:
https://sourceforge.net/projects/libjpeg-turbo/files/2.1.5.1/

Change log is here:
https://github.com/libjpeg-turbo/libjpeg-turbo/releases/tag/2.1.5.1


3.0 beta2:

Binaries and source tarball are here:
https://sourceforge.net/projects/libjpeg-turbo/files/2.1.91%20%283.0%20beta2%29/

Change log is here:
https://github.com/libjpeg-turbo/libjpeg-turbo/releases/tag/2.1.91

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