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This patch tries to fix various crashes for applications depending on libmilter by setting the stack size for pthreads to 8 MB. The default stack size for musl libc is set to 80 KB whereas glibc has it set to 8 MB. This causes problems when a large amount of memory is allocated on the stack. For example, opendkim allocates blocks of 64 KB multiple times, which causes libmilter (and therefore opendkim) to crash. Maybe a stack size of 1 MB or 2 MB would be sufficient, but as opendkim depends on the default glibc behavior, 8 MB should be safe. I know this patch is kind of ugly, a better solution may be to file a request for opendkim to allocate large blocks of memory on the heap. But as libmilter/opendkim are fairly unusable at the moment, I suggest to apply this patch as long as these packages are in testing. Fixes https://bugs.alpinelinux.org/issues/6360
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