For developers, until a Catalina Beta build is available with the fix, this crash is not reproducible if you build without jemalloc. Use ````ac_add_options --disable-jemalloc```` in your mozconfig. Thanks to :mstange for pointing out bug 1092855 where a similar problem happened before. Given that building without jemalloc avoids the problem, the bug is likely due to a use-after-free or uninitialized variable.
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For developers, until a Catalina Beta build is available with the fix, this crash is not reproducible if you build without jemalloc. Use ````ac_add_options --disable-jemalloc```` in your mozconfig. Thanks to :mstange for pointing out bug 1092855 where a similar problem happened before. Given that building without jemalloc avoids the problem, the bug is likely due to a use-after-free or uninitialized variable in Apple code.