linux-kernel - RE: [PATCH 2/3] x86/mce: Avoid infinite loop for copy from user recovery

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Message-ID: <3f944f83524d40a28fa9bb94647d1679@intel.com>
Date:   Fri, 23 Jul 2021 14:47:40 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Jue Wang <juew@...gle.com>
CC:     Borislav Petkov <bp@...en8.de>,
        "dinghui@...gfor.com.cn" <dinghui@...gfor.com.cn>,
        "huangcun@...gfor.com.cn" <huangcun@...gfor.com.cn>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        HORIGUCHI NAOYA(堀口 直也) 
        <naoya.horiguchi@....com>, Oscar Salvador <osalvador@...e.de>,
        x86 <x86@...nel.org>, "Song, Youquan" <youquan.song@...el.com>
Subject: RE: [PATCH 2/3] x86/mce: Avoid infinite loop for copy from user
 recovery

> In our test, the application memory was anon.
> With 1 UC error injected, the test always passes with the error
> recovered and a SIGBUS delivered to user space.
>
> When there are >1 UC errors in buffer, then indefinite mce loop.

Do you still see the infinite loop with these three patches on top of
v5.14-rc, rather than a short byte return value from write, or

	mce_panic("Machine checks to different user pages", m, msg);

-Tony