linux-kernel - RE: x86/non-x86: percpu, node ids, apic ids x86.git fixup

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Date:	Tue, 5 Feb 2008 11:05:03 -0800
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Mike Travis" <travis@....com>,
	"Geert Uytterhoeven" <Geert.Uytterhoeven@...ycom.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Linux Kernel Development" <linux-kernel@...r.kernel.org>,
	"Linux/PPC Development" <linuxppc-dev@...abs.org>,
	<linux-ia64@...r.kernel.org>, <sparclinux@...r.kernel.org>
Subject: RE: x86/non-x86: percpu, node ids, apic ids x86.git fixup

> Applied that patch and UP kernel built ok, and then crashed in the
> same place with the memset() to a user-looking address from kmem_cache_alloc()
>
> So the percpu changes are innocent ... something else since 2.6.24 is
> to blame.  Only 5749 commits :-)  I'll start bisecting.

The bisection narrowed in on an innocent patch in ipv4 space.  Meanwhile
the rush of patches continues.  When I retested yesterday when Linus
HEAD was 8af03e782... the CONFIG_SMP=n kernel worked perfectly.  So
maybe it was fixed?  Or maybe the bug depends on the relative
location of various bits of code/data and as the kernel grows and
shrinks with incoming changes the problem comes and goes :-(

-Tony
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