linux-kernel - Re: [PATCH] mm: fix up a spurious page fault whenever it happens

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Message-ID: <CA+55aFwm-a0O-jvznYpXM4Ctf_jex+gcgELq_pqXL38Y6X-JPg@mail.gmail.com>
Date:	Tue, 18 Jun 2013 19:20:37 -1000
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Stanislav Meduna <stano@...una.org>
Cc:	Rik van Riel <riel@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	"linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Hai Huang <hhuang@...hat.com>
Subject: Re: [PATCH] mm: fix up a spurious page fault whenever it happens

On Tue, Jun 18, 2013 at 9:13 AM, Stanislav Meduna <stano@...una.org> wrote:
>
> No crash in 2 days running with preempt none...

Is this UP?

There's the fast_tlb race that Peter fixed in commit 29eb77825cc7
("arch, mm: Remove tlb_fast_mode()"). I'm not seeing how it would
cause infinite TLB faults, but it definitely causes potentially
incoherent TLB contents. And afaik it only happens with
CONFIG_PREEMPT, and on UP systems. Which sounds like it might match
your setup...

                Linus
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