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From: Stanislav Meduna <stano@meduna.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Rik van Riel <riel@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	"linux-rt-users@vger.kernel.org" <linux-rt-users@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	the arch/x86 maintainers <x86@kernel.org>,
	Hai Huang <hhuang@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH] mm: fix up a spurious page fault whenever it happens
Date: Wed, 19 Jun 2013 09:36:39 +0200	[thread overview]
Message-ID: <51C15F87.20100@meduna.org> (raw)
In-Reply-To: <CA+55aFwm-a0O-jvznYpXM4Ctf_jex+gcgELq_pqXL38Y6X-JPg@mail.gmail.com>

On 19.06.2013 07:20, Linus Torvalds wrote:

>> No crash in 2 days running with preempt none...
> 
> Is this UP?

Yes it is.

> 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...

Oh, thank you for the pointer, this indeed looks interesting.

Unfortunately the patch massively does not apply to 3.4 which
I am using and I know too little what all is involved here
to backport it. I will test it when (if) it gets to the 3.4(-rt)
(or when I find some spare time to play with the newer kernel
on that system).

Thanks
-- 
                                     Stano


  reply	other threads:[~2013-06-19  7:36 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-17  8:42 [PATCH - sort of] x86: Livelock in handle_pte_fault Stanislav Meduna
2013-05-22  0:39 ` Steven Rostedt
2013-05-22  7:32   ` Stanislav Meduna
2013-05-22 12:33   ` Rik van Riel
2013-05-22 15:01     ` Linus Torvalds
2013-05-22 17:41       ` [PATCH] mm: fix up a spurious page fault whenever it happens Rik van Riel
2013-05-22 18:04         ` Stanislav Meduna
2013-05-22 18:11           ` Steven Rostedt
2013-05-22 18:21             ` Stanislav Meduna
2013-05-22 18:35               ` Rik van Riel
2013-05-22 18:42                 ` H. Peter Anvin
2013-05-22 18:43                   ` Rik van Riel
2013-05-23  8:07                     ` Stanislav Meduna
2013-05-23 12:19                       ` Rik van Riel
2013-05-23 13:29                         ` Steven Rostedt
2013-05-23 15:06                           ` H. Peter Anvin
2013-05-23 15:27                             ` Steven Rostedt
2013-05-23 17:24                               ` H. Peter Anvin
2013-05-23 17:36                                 ` Steven Rostedt
2013-05-23 17:38                                   ` H. Peter Anvin
2013-05-24  8:29                         ` Stanislav Meduna
2013-05-24 10:28                           ` Stanislav Meduna
2013-05-24 13:06                           ` Rik van Riel
2013-05-24 13:55                             ` Stanislav Meduna
2013-05-24 14:23                               ` Stanislav Meduna
2013-06-16 21:34                             ` Stanislav Meduna
2013-06-18 19:13                               ` Stanislav Meduna
2013-06-19  5:20                                 ` Linus Torvalds
2013-06-19  7:36                                   ` Stanislav Meduna [this message]
2013-06-19  8:06                                     ` Peter Zijlstra
2013-06-20 17:50                                       ` Stanislav Meduna
2013-05-23 14:45                       ` Linus Torvalds
2013-05-23 14:50                         ` Linus Torvalds
2013-05-23 15:03                           ` Stanislav Meduna
2013-05-22 18:47                 ` Stanislav Meduna

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