[Bug 295991] lib/libc posix_spawnp(): PATH-search child runs on an undersized rfork_thread stack and underflows into the caller's heap (heavily-linked processes; PHP proc_open)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295991

Kyle Evans <kevans@freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kevans@freebsd.org,
                   |                            |kib@FreeBSD.org

--- Comment #3 from Kyle Evans <kevans@freebsd.org> ---
I'm tempted to switch the posix_spawn stack size to `DFLSSIZ` or kern.dflssiz,
depending on how fancy we want to be:

```
amd64/include/vmparam.h:65:#define      DFLSSIZ         (8UL*1024*1024)        
/* initial stack size limit */
arm/include/vmparam.h:54:#define        DFLSSIZ         (4UL*1024*1024)        
/* initial stack size limit */
arm64/include/vmparam.h:56:#define      DFLSSIZ         (128*1024*1024)        
/* initial stack size limit */
i386/include/vmparam.h:55:#define       DFLSSIZ         (8UL*1024*1024)        
/* initial stack size limit */
powerpc/include/vmparam.h:62:#define    DFLSSIZ         (8*1024*1024)          
/* default stack size */
riscv/include/vmparam.h:52:#define      DFLSSIZ         (128*1024*1024)        
/* initial stack size limit */
```

128M on arm64 is maybe a little excessive?  Better safe than sorry, though.  CC
kib@ in case he has a better opinion.

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