Re: unaligned accesses in SLAB etc.

From: mroos
Date: Tue Oct 14 2014 - 17:19:45 EST

> > I'd like to know that your another problem is related to commit
> > bf0dea23a9c0 ("mm/slab: use percpu allocator for cpu cache"). So,
> > if the commit is reverted, your another problem is also gone
> > completely?
> The other problem has been present forever.

Umm? I am afraid I have been describing it badly. This random
SIGBUS+SIGSEGV problem is new - I have not seen it before.

I have been able to do kernel compiles for years on sparc64 (modulo
specific bugs in specific configurations) and 3.17 + start/end swap
patch seems also stable for most machine. With yesterdays git + align
patch, it dies with SIGBUS multiple times during compilation so it's a
new regression for me.

Will try reverting that commit tomorrow.

My only other current sparc64 problems that I am seeing - V210/V440 die
during bootup if compiled with gcc 4.9 and V480 dies with FATAL
exceptions during bootups since previous kernel release. Maybe also
exit_mmap warning - I do not know if they have been fixed, I see them

Meelis Roos (mroos@xxxxxxxx)
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