linux-kernel - Re: [PATCH v2] issue storage device flush via sync

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Message-ID: <49CC4558.7020701@garzik.org>
Date:	Thu, 26 Mar 2009 23:17:44 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Theodore Tso <tytso@....edu>, Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>, David Rees <drees76@...il.com>,
	Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] issue storage device flush via sync_blockdev()

Theodore Tso wrote:
> Jeff,
> 
> FYI, I tried your patch; it causes the lvm process called out of
> the initramfs from an Ubuntu 8.10 system to blow up while trying to
> set up the root filesystem.  The stack trace was:
> 
> generic_make_request+0x2a3/0x2e6
> trace_hardirqs_on_caller+0x111/0x135
> mempool_alloc_slab+0xe/0x10
> mempool_alloc+0x42/0xe0
> submit_bio+0xad/0xb5
> bio_alloc_bioset+0x21/0xfc
> blkdev_issue_flush+0x7f/0xfc
> syn_blockdev+0x2a/0x36
> __blkdev_put_0x44/0x131
> blkdev_put+0xa/0xc
> blkdev_close+0x2e/0x32
> __fput+0xcf/0x15f
> fput+0x19/0x1b
> filp_close+0x51/0x5b
> sys_close+0x73/0xad

hmmm, I wonder if DM/LVM doesn't like blkdev_issue_flush, or it's too 
early, or what.  I'll toss Ubuntu onto a VM and check it out...

	Jeff



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