From: Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
To: Dave Kleikamp <dave.kleikamp-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Cc: Hugh Dickins <hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Linus Torvalds
<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
"Rafael J. Wysocki" <rjw-KKrjLPT3xs0@public.gmane.org>,
jfs-discussion-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
Kernel Testers List
<kernel-testers-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Maciej Rutecki
<maciej.rutecki-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Florian Mickler <florian-sVu6HhrpSfRAfugRpC6u6w@public.gmane.org>,
davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org,
Al Viro <viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org
Subject: Re: [PATCH v2] vfs: __read_cache_page should use gfp argument rather than GFP_KERNEL
Date: Wed, 21 Dec 2011 12:28:43 -0800 [thread overview]
Message-ID: <20111221122843.18f673c7.akpm@linux-foundation.org> (raw)
In-Reply-To: <4EF211EC.7090002-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
On Wed, 21 Dec 2011 11:05:48 -0600
Dave Kleikamp <dave.kleikamp-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org> wrote:
> [ updated to remove now-obsolete comment in read_cache_page_gfp()]
>
> lockdep reports a deadlock in jfs because a special inode's rw semaphore
> is taken recursively. The mapping's gfp mask is GFP_NOFS, but is not used
> when __read_cache_page() calls add_to_page_cache_lru().
Well hang on, it's not just a lockdep splat. The kernel actually will
deadlock if we reenter JFS via this GFP_KERNEL allocation attempt, yes?
Was that GFP_NOFS allocation recently added to JFS? If not then we
should backport this deadlock fix into -stable, no?
WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: Dave Kleikamp <dave.kleikamp@oracle.com>
Cc: Hugh Dickins <hughd@google.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
jfs-discussion@lists.sourceforge.net,
Kernel Testers List <kernel-testers@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Maciej Rutecki <maciej.rutecki@gmail.com>,
Florian Mickler <florian@mickler.org>,
davem@davemloft.net, Al Viro <viro@zeniv.linux.org.uk>,
linux-mm@kvack.org
Subject: Re: [PATCH v2] vfs: __read_cache_page should use gfp argument rather than GFP_KERNEL
Date: Wed, 21 Dec 2011 12:28:43 -0800 [thread overview]
Message-ID: <20111221122843.18f673c7.akpm@linux-foundation.org> (raw)
In-Reply-To: <4EF211EC.7090002@oracle.com>
On Wed, 21 Dec 2011 11:05:48 -0600
Dave Kleikamp <dave.kleikamp@oracle.com> wrote:
> [ updated to remove now-obsolete comment in read_cache_page_gfp()]
>
> lockdep reports a deadlock in jfs because a special inode's rw semaphore
> is taken recursively. The mapping's gfp mask is GFP_NOFS, but is not used
> when __read_cache_page() calls add_to_page_cache_lru().
Well hang on, it's not just a lockdep splat. The kernel actually will
deadlock if we reenter JFS via this GFP_KERNEL allocation attempt, yes?
Was that GFP_NOFS allocation recently added to JFS? If not then we
should backport this deadlock fix into -stable, no?
--
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WARNING: multiple messages have this Message-ID (diff)
From: Andrew Morton <akpm@linux-foundation.org>
To: Dave Kleikamp <dave.kleikamp@oracle.com>
Cc: Hugh Dickins <hughd@google.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
jfs-discussion@lists.sourceforge.net,
Kernel Testers List <kernel-testers@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Maciej Rutecki <maciej.rutecki@gmail.com>,
Florian Mickler <florian@mickler.org>,
davem@davemloft.net, Al Viro <viro@zeniv.linux.org.uk>,
linux-mm@kvack.org
Subject: Re: [PATCH v2] vfs: __read_cache_page should use gfp argument rather than GFP_KERNEL
Date: Wed, 21 Dec 2011 12:28:43 -0800 [thread overview]
Message-ID: <20111221122843.18f673c7.akpm@linux-foundation.org> (raw)
In-Reply-To: <4EF211EC.7090002@oracle.com>
On Wed, 21 Dec 2011 11:05:48 -0600
Dave Kleikamp <dave.kleikamp@oracle.com> wrote:
> [ updated to remove now-obsolete comment in read_cache_page_gfp()]
>
> lockdep reports a deadlock in jfs because a special inode's rw semaphore
> is taken recursively. The mapping's gfp mask is GFP_NOFS, but is not used
> when __read_cache_page() calls add_to_page_cache_lru().
Well hang on, it's not just a lockdep splat. The kernel actually will
deadlock if we reenter JFS via this GFP_KERNEL allocation attempt, yes?
Was that GFP_NOFS allocation recently added to JFS? If not then we
should backport this deadlock fix into -stable, no?
next prev parent reply other threads:[~2011-12-21 20:28 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-20 23:54 [Resend] 3.2-rc6+: Reported regressions from 3.0 and 3.1 Rafael J. Wysocki
2011-12-20 23:54 ` Rafael J. Wysocki
[not found] ` <201112210054.46995.rjw-KKrjLPT3xs0@public.gmane.org>
2011-12-21 2:31 ` Linus Torvalds
2011-12-21 2:31 ` Linus Torvalds
[not found] ` <CA+55aFzee7ORKzjZ-_PrVy796k2ASyTe_Odz=ji7f1VzToOkKw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-12-21 4:23 ` Dave Kleikamp
2011-12-21 4:23 ` Dave Kleikamp
[not found] ` <4EF15F42.4070104-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2011-12-21 4:44 ` Linus Torvalds
2011-12-21 4:44 ` Linus Torvalds
2011-12-21 4:44 ` Linus Torvalds
2011-12-21 6:15 ` Hugh Dickins
[not found] ` <alpine.LSU.2.00.1112202213310.3987-fupSdm12i1nKWymIFiNcPA@public.gmane.org>
2011-12-21 7:10 ` Al Viro
2011-12-21 7:10 ` Al Viro
2011-12-21 7:10 ` Al Viro
2011-12-21 17:05 ` [PATCH v2] vfs: __read_cache_page should use gfp argument rather than GFP_KERNEL Dave Kleikamp
2011-12-21 17:05 ` Dave Kleikamp
[not found] ` <4EF211EC.7090002-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2011-12-21 20:28 ` Andrew Morton [this message]
2011-12-21 20:28 ` Andrew Morton
2011-12-21 20:28 ` Andrew Morton
2011-12-21 20:53 ` Dave Kleikamp
2011-12-21 20:53 ` Dave Kleikamp
2011-12-21 4:50 ` [Resend] 3.2-rc6+: Reported regressions from 3.0 and 3.1 David Miller
2011-12-21 4:50 ` David Miller
2011-12-21 16:32 ` Nick Bowler
2011-12-21 16:32 ` Nick Bowler
[not found] ` <20111221163213.GA17116-7BP4RkwGw0uXmMXjJBpWqg@public.gmane.org>
2011-12-21 17:51 ` Keith Packard
2011-12-21 17:51 ` Keith Packard
2011-12-21 21:01 ` Jan Kara
2011-12-21 21:01 ` Jan Kara
2011-12-22 10:58 ` Srivatsa S. Bhat
2011-12-22 10:58 ` Srivatsa S. Bhat
[not found] ` <4EF30D4B.9060906-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2011-12-22 11:27 ` Jeff Layton
2011-12-22 11:27 ` Jeff Layton
2011-12-22 11:15 ` Srivatsa S. Bhat
2011-12-22 11:15 ` Srivatsa S. Bhat
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