linux-kernel - Re: XFS memory allocation deadlock in 2.6.38

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Message-ID: <20110329192434.GA10536@infradead.org>
Date:	Tue, 29 Mar 2011 15:24:34 -0400
From:	'Christoph Hellwig' <hch@...radead.org>
To:	Sean Noonan <Sean.Noonan@...sigma.com>
Cc:	'Michel Lespinasse' <walken@...gle.com>,
	'Christoph Hellwig' <hch@...radead.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	Martin Bligh <Martin.Bligh@...sigma.com>,
	Trammell Hudson <Trammell.Hudson@...sigma.com>,
	Christos Zoulas <Christos.Zoulas@...sigma.com>,
	"'linux-xfs@....sgi.com'" <linux-xfs@....sgi.com>,
	Stephen Degler <Stephen.Degler@...sigma.com>,
	"'linux-mm@...ck.org'" <linux-mm@...ck.org>
Subject: Re: XFS memory allocation deadlock in 2.6.38

Can you check if the brute force patch below helps?  If it does I
still need to refine it a bit, but it could be that we are doing
an allocation under an xfs lock that could recurse back into the
filesystem.  We have a per-process flag to disable that for normal
kmalloc allocation, but we lost it for vmalloc in the commit you
bisected the regression to.


Index: xfs/fs/xfs/linux-2.6/kmem.h
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/kmem.h	2011-03-29 21:16:58.039224236 +0200
+++ xfs/fs/xfs/linux-2.6/kmem.h	2011-03-29 21:17:08.368223598 +0200
@@ -63,7 +63,7 @@ static inline void *kmem_zalloc_large(si
 {
 	void *ptr;
 
-	ptr = vmalloc(size);
+	ptr = __vmalloc(size, GFP_NOFS | __GFP_HIGHMEM, PAGE_KERNEL);
 	if (ptr)
 		memset(ptr, 0, size);
 	return ptr;
--
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