linux-kernel - Re: swapoff() runs forever

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Message-ID: <4F860F17.2090400@nod.at>
Date:	Thu, 12 Apr 2012 01:09:11 +0200
From:	Richard Weinberger <richard@....at>
To:	Hugh Dickins <hughd@...gle.com>
CC:	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"paul.gortmaker@...driver.com" <paul.gortmaker@...driver.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: swapoff() runs forever

Am 09.04.2012 20:40, schrieb Hugh Dickins:
> I've not seen any such issue in recent months (or years), but
> I've not been using UML either.  The most likely cause that springs
> to mind would be corruption of the vmalloc'ed swap map: that would
> be very likely to cause such a hang.

It does not look like a swap map corruption.
If I restart most user space processes swapoff() terminates fine.
Maybe it is a refcounting problem?

> You say "recent Linux kernels": I wonder what "recent" means.
> Is this something you can reproduce quickly and reliably enough
> to do a bisection upon?
>

I can reproduce the issue on any UML kernel.
The oldest I've tested was 2.6.20.
Therefore, bug was not introduced by me. B-)

Thanks,
//richard
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