From: "Luck, Tony" <tony.luck@intel.com>
To: Borislav Petkov <bp@alien8.de>, Jue Wang <juew@google.com>
Cc: "x86@kernel.org" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"patches@lists.linux.dev" <patches@lists.linux.dev>
Subject: RE: [PATCH] x86/mce: Add workaround for SKX/CLX/CPX spurious machine checks
Date: Wed, 16 Feb 2022 18:41:58 +0000 [thread overview]
Message-ID: <9f402331d25c47b69349c8171bbd49c1@intel.com> (raw)
In-Reply-To: <Yg08Uhg0fZ9xZuP2@zn.tnic>
> Well, we could try to decode the instructions around rIP when the #MC
> is raised and see what caused the MCE and perhaps pick apart which insn
> caused it, is it accessing behind the buffer boundaries, etc.
Is this a case of "perfect is the enemy of good enough"?
It is a rare scenario (only a pain point for Jue because Google has billions and billions
of cores running this code). You need:
1) An uncorrected error
2) That error must be in first cache line of a page
3) Kernel must execute page_copy from the page immediately before that page
When all three happen, kernel crashes because we don't
have a recover path from kernel page_copy
-Tony
next prev parent reply other threads:[~2022-02-16 18:42 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-07 4:36 [RFC] x86/mce: Add workaround for SKX/CLX/CPX spurious machine checks Jue Wang
2022-02-07 18:23 ` Luck, Tony
2022-02-07 18:52 ` Borislav Petkov
2022-02-07 19:24 ` Luck, Tony
2022-02-07 20:27 ` Borislav Petkov
2022-02-07 21:07 ` Luck, Tony
2022-02-07 21:20 ` Borislav Petkov
2022-02-07 21:51 ` Luck, Tony
2022-02-08 15:04 ` Jue Wang
2022-02-08 15:09 ` [PATCH] " Jue Wang
2022-02-11 20:08 ` Jue Wang
2022-02-11 20:18 ` Borislav Petkov
2022-02-11 20:23 ` Jue Wang
2022-02-15 18:42 ` Luck, Tony
2022-02-15 22:08 ` Borislav Petkov
2022-02-15 22:22 ` Luck, Tony
2022-02-16 10:28 ` Borislav Petkov
2022-02-16 15:50 ` Jue Wang
2022-02-16 18:02 ` Borislav Petkov
2022-02-16 18:41 ` Luck, Tony [this message]
2022-02-16 18:52 ` Borislav Petkov
2022-02-16 18:58 ` Luck, Tony
2022-02-16 18:59 ` Jue Wang
2022-02-16 21:53 ` [PATCH] x86/mce: work around an erratum on fast string copy instructions Jue Wang
2022-02-17 16:30 ` Borislav Petkov
2022-02-17 16:32 ` Borislav Petkov
2022-02-18 1:32 ` [PATCH v2] " Jue Wang
2022-02-18 15:07 ` Borislav Petkov
2022-02-18 16:03 ` Jue Wang
2022-02-18 16:14 ` Borislav Petkov
2022-02-18 16:21 ` Jue Wang
2022-02-18 17:16 ` Borislav Petkov
2022-02-18 17:39 ` Jue Wang
[not found] ` <CAPcxDJ7=hCz6KRih4OBVv-k8WLcBL4n+VSpeP_zky7Uunq89zg@mail.gmail.com>
2022-02-18 22:05 ` Borislav Petkov
2022-02-18 22:38 ` Luck, Tony
2022-02-18 22:58 ` Borislav Petkov
2022-02-18 17:58 ` Luck, Tony
2022-02-19 18:09 ` [tip: ras/core] x86/mce: Work " tip-bot2 for Jue Wang
2022-02-16 5:40 ` [PATCH] x86/mce: Add workaround for SKX/CLX/CPX spurious machine checks Jue Wang
2022-02-16 5:56 ` [PATCH] x86/mce: work around an erratum on fast string copy instructions Jue Wang
2022-02-16 9:04 ` David Laight
2022-02-16 15:33 ` Jue Wang
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