From: Richard Weinberger <richard@nod.at>
To: Hugh Dickins <hughd@google.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"paul.gortmaker@windriver.com" <paul.gortmaker@windriver.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: swapoff() runs forever
Date: Thu, 12 Apr 2012 01:09:11 +0200 [thread overview]
Message-ID: <4F860F17.2090400@nod.at> (raw)
In-Reply-To: <alpine.LSU.2.00.1204091123380.1430@eggly.anvils>
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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WARNING: multiple messages have this Message-ID (diff)
From: Richard Weinberger <richard@nod.at>
To: Hugh Dickins <hughd@google.com>
Cc: Konstantin Khlebnikov <khlebnikov@openvz.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"paul.gortmaker@windriver.com" <paul.gortmaker@windriver.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: swapoff() runs forever
Date: Thu, 12 Apr 2012 01:09:11 +0200 [thread overview]
Message-ID: <4F860F17.2090400@nod.at> (raw)
In-Reply-To: <alpine.LSU.2.00.1204091123380.1430@eggly.anvils>
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
next prev parent reply other threads:[~2012-04-11 23:09 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-08 20:30 swapoff() runs forever Richard Weinberger
2012-04-09 5:35 ` Konstantin Khlebnikov
2012-04-09 5:35 ` Konstantin Khlebnikov
2012-04-09 10:16 ` Richard Weinberger
2012-04-09 18:40 ` Hugh Dickins
2012-04-09 18:40 ` Hugh Dickins
2012-04-09 19:43 ` Richard Weinberger
2012-04-09 19:43 ` Richard Weinberger
2012-04-11 23:09 ` Richard Weinberger [this message]
2012-04-11 23:09 ` Richard Weinberger
2012-04-12 6:40 ` Hugh Dickins
2012-04-12 6:40 ` Hugh Dickins
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