Idea from different projects as OpenWrt and others.
https://lists.openwrt.org/pipermail/openwrt-devel/2013-November/022299.html
https://github.com/wl500g/toolchain/blob/master/toolchain/uClibc/patches/0.9.32/980-stack-cache-maxsize.patch
/* Cache handling for not-yet free stacks. */
-/* Maximum size in kB of cache. */
-static size_t stack_cache_maxsize = 40 * 1024 * 1024; /* 40MiBi by default. */
+/*
+ Maximum size in kB of cache. GNU libc default is 40MiB
+ embedded systems don't have enough ram for big dirty stack caches,
+ reduce it to 16MiB. 4 does not work, f.e. tst-kill4 segfaults.
+*/
+static size_t stack_cache_maxsize = 16 * 1024 * 1024;
static size_t stack_cache_actsize;
/* Mutex protecting this variable. */