On 12/20/17 09:14, John Baldwin wrote:
On Wednesday, December 20, 2017 09:59:26 AM David Chisnall wrote:
On 16 Dec 2017, at 18:05, John Baldwin <j...@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.
With GCC 4, it takes a little while, but trying to build ports over NFS
is a sure-fire way to bring down the kernel. I haven't tried any other
compilers.
-Nathan
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