[Bug 234775] PTHREAD_STACK_MIN is too small on amd64

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From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 02 Dec 2021 08:06:52 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234775

--- Comment #5 from Paul Floyd <pjfloyd@wanadoo.fr> ---
Seems to be defined here

paulf> grep -rI __MINSIGSTKSZ * | grep -v obj
include/pthread.h:#define       PTHREAD_STACK_MIN                      
__MINSIGSTKSZ
sys/arm64/include/_limits.h:#define     __MINSIGSTKSZ   (1024 * 4)
sys/riscv/include/_limits.h:#define     __MINSIGSTKSZ   (1024 * 4)
sys/sys/signal.h:#include <machine/_limits.h>   /* __MINSIGSTKSZ */
sys/sys/signal.h:#define        MINSIGSTKSZ     __MINSIGSTKSZ           /*
minimum stack size */
sys/powerpc/include/_limits.h:#define   __MINSIGSTKSZ   (512 * 4)
sys/x86/include/_limits.h:#define       __MINSIGSTKSZ   (512 * 4)
sys/arm/include/_limits.h:#define       __MINSIGSTKSZ   (1024 * 4)
sys/mips/include/_limits.h:#define __MINSIGSTKSZ     (512 * 4)



Used in quite a lot of places, including sysconf()

So, what to do?

__MINSIGSTKSZ is used for both signal stacks and pthread stacks.

I guess changing 

sys/x86/include/_limits.h:#define       __MINSIGSTKSZ   (512 * 4)

to

sys/x86/include/_limits.h:#define       __MINSIGSTKSZ   (1024 * 4)

would do the job on i386 and amd64

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