linux-kernel - Re: [ghes_copy_tofrom_phys] BUG: sleeping function called from invalid context at mm/page

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Message-ID: <20171030140553.akse6wcfzmuhldad@pd.tnic>
Date:   Mon, 30 Oct 2017 15:06:04 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Tyler Baicar <tbaicar@...eaurora.org>
Cc:     Fengguang Wu <fengguang.wu@...el.com>,
        Huang Ying <ying.huang@...el.com>,
        Chen Gong <gong.chen@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Will Deacon <will.deacon@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [ghes_copy_tofrom_phys] BUG: sleeping function called from
 invalid context at mm/page_alloc.c:4150

On Mon, Oct 30, 2017 at 10:01:52AM -0400, Tyler Baicar wrote:
> This is not as important for polling sources as it is for the
> interrupt sources since polling sources are regularly checked and
> shouldn't be used for fatal error scenarios. For interrupt driven
> sources, there could already be a fatal error pending, so we should
> handle it immediately.

Whatever it is, you can't call it there as it could deadlock. You need
to think about doing that differently. If you can't come up with a
solution quickly, it should be reverted and then you can try again
later.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--