linux-kernel - Re: 2.6.23-rc1-mm1 -- INFO: possible recursive locking detected -- (&hashbin->hb_spinlock){....}, at: [<c03d95d3>] irias_seq

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Message-ID: <6599ad830707292244x3dbdf662l95de9bf3c1f5614e@mail.gmail.com>
Date:	Sun, 29 Jul 2007 22:44:07 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Miles Lane" <miles.lane@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Dag Brattli" <dagb@...uit.no>, samuel@...tiz.org
Subject: Re: 2.6.23-rc1-mm1 -- INFO: possible recursive locking detected -- (&hashbin->hb_spinlock){....}, at: [<c03d95d3>] irias_seq_show+0xba/0x1a8

On 7/28/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> >  [<c0154ad2>] proc_cpuset_show+0x5e/0xb9
> >  [<c01976b1>] seq_read+0xef/0x266
> >  [<c0181398>] vfs_read+0x8e/0x117
> >  [<c01817c9>] sys_read+0x3d/0x61
> >  [<c010401e>] sysenter_past_esp+0x5f/0x99
> >  =======================
> > INFO: lockdep is turned off.
> > Code: 00 89 d8 83 c4 0c 5b 5e 5f 5d c3 55 89 e5 57 56 53 83 ec 08 89
> > 45 f0 89 55 ec 89 d3 01 cb 8d 43 ff c6 43 ff 00 8b 55 f0 8b 72 1c <8b>
> > 56 3c 29 d0 3b 45 ec 72 45 89 d1 c1 e9 02 8b 76 40 89 c7 f3
> > EIP: [<c01536a7>] container_path+0x20/0x7b SS:ESP 0068:c5ccff00
>

Oops, this is a case of trying to read /proc/self/cpuset when cpusets
are completely unmounted. It works fine when cpusets is mounted as
part of any hierarchy, or part of an active but unmounted hierarchy.
Attached patch fixes it, and should be rolled in to the first patch of
the series. (basic framework patch).

Paul

View attachment "fix-proc-self-cpuset.patch" of type "text/x-patch" (573 bytes)