linux-kernel - Re: Unkillable R-state process stuck in sendfile

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Message-ID: <59184.1392750827@turing-police.cc.vt.edu>
Date:	Tue, 18 Feb 2014 14:13:47 -0500
From:	Valdis.Kletnieks@...edu
To:	Vladimir Davydov <vdavydov@...allels.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Jan Kara <jack@...e.cz>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Unkillable R-state process stuck in sendfile

On Mon, 17 Feb 2014 16:51:37 +0400, Vladimir Davydov said:

>         out_fd = eventfd(0, 0);
>         if (out_fd < 0)
>                 err(1, "eventfd");
>         ret = sendfile64(out_fd, in_fd, NULL, SIZE);

> I'm not sure if this is actually bad and should be fixed, but perhaps
> it's worth making do_generic_file_read() check for fatal signals pending
> and break the read loop if so?

Why do we even allow an eventfd to be fed to sendfile64 at all? What
does that even *mean*?

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