svn commit: r326758 - in head/sys/i386: conf include

[John Baldwin]

On Wednesday, December 20, 2017 09:59:26 AM David Chisnall wrote:
> On 16 Dec 2017, at 18:05, John Baldwin <jhb at FreeBSD.org> wrote:
> > 
> > When I build a FreeBSD/mips64 kernel with clang,
> > _any_ simple NFS op triggers a kernel stack overflow.  Kernels compiled
> > with GCC do not.
> 
> That is not my experience.  I haven’t tried a MIPS64 kernel built with clang, but with in-tree gcc I get kernel panics as soon as I try to use NFS, unless I use Stacey’s patches that increase the kernel stack size.

I have primarily been using modern GCC for GCC once that was working, but at
least when running a MALTA64 kernel under qemu I was not triggering panics
even with old GCC.  With the in-tree clang 5.0 or with CHERI clang, just
doing an 'ls' of a NFS directory or even a tab-complete of a path that
is on NFS reliably triggers a kernel stack overflow for MALTA64 in qemu.

With Stacey's kstack pages, a clang kernel does survive, but those are not
in stock FreeBSD which is where I have been testing this.

-- 
John Baldwin