linux-kernel - Re: unaligned accesses in SLAB etc.

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Message-ID: <alpine.LRH.2.11.1410150012001.11850@adalberg.ut.ee>
Date:	Wed, 15 Oct 2014 00:19:36 +0300 (EEST)
From:	mroos@...ux.ee
To:	David Miller <davem@...emloft.net>
cc:	iamjoonsoo.kim@....com, linux-kernel@...r.kernel.org, cl@...ux.com,
	penberg@...nel.org, rientjes@...gle.com, akpm@...ux-foundation.org,
	linux-mm@...ck.org, sparclinux@...r.kernel.org
Subject: Re: unaligned accesses in SLAB etc.

> > 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 
rarely.

-- 
Meelis Roos (mroos@...ux.ee)
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