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Re: [Qemu-devel] ext4 error when testing virtio-scsi & vhost-scsi
From: |
Dave Chinner |
Subject: |
Re: [Qemu-devel] ext4 error when testing virtio-scsi & vhost-scsi |
Date: |
Wed, 13 Jul 2016 09:03:56 +1000 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Tue, Jul 12, 2016 at 12:43:24PM -0400, Theodore Ts'o wrote:
> On Tue, Jul 12, 2016 at 03:14:38PM +0800, Zhangfei Gao wrote:
> > Some update:
> >
> > If test with ext2, no problem in iblock.
> > If test with ext4, ext4_mb_generate_buddy reported error in the
> > removing files after reboot.
> >
> >
> > root@(none)$ rm test
> > [ 21.006549] EXT4-fs error (device sda): ext4_mb_generate_buddy:758:
> > group 18
> > , block bitmap and bg descriptor inconsistent: 26464 vs 25600 free clusters
> > [ 21.008249] JBD2: Spotted dirty metadata buffer (dev = sda, blocknr =
> > 0). Th
> > ere's a risk of filesystem corruption in case of system crash.
> >
> > Any special notes of using ext4 in qemu?
>
> Ext4 has more runtime consistency checking than ext2. So just because
> ext4 complains doesn't mean that there isn't a problem with the file
> system; it just means that ext4 is more likely to notice before you
> lose user data.
>
> So if you test with ext2, try running e2fsck afterwards, to make sure
> the file system is consistent.
>
> Given that I'm reguarly testing ext4 using kvm, and I haven't seen
> anything like this in a very long time, I suspect the problemb is with
> your SCSI code, and not with ext4.
It's the same error I reported yesterday for ext3 on 4.7-rc6 when
rebooting a VM after it hung.
Cheers,
Dave.
--
Dave Chinner
address@hidden
- Re: [Qemu-devel] ext4 error when testing virtio-scsi & vhost-scsi, Zhangfei Gao, 2016/07/11
- Re: [Qemu-devel] ext4 error when testing virtio-scsi & vhost-scsi, Zhangfei Gao, 2016/07/12
- Re: [Qemu-devel] ext4 error when testing virtio-scsi & vhost-scsi, Zhangfei Gao, 2016/07/13
- Re: [Qemu-devel] ext4 error when testing virtio-scsi & vhost-scsi, Zhangfei Gao, 2016/07/19
- Re: [Qemu-devel] ext4 error when testing virtio-scsi & vhost-scsi, Zhangfei Gao, 2016/07/19
- Re: [Qemu-devel] ext4 error when testing virtio-scsi & vhost-scsi, Zhangfei Gao, 2016/07/27
- Re: [Qemu-devel] ext4 error when testing virtio-scsi & vhost-scsi, Jan Kara, 2016/07/27
- Re: [Qemu-devel] ext4 error when testing virtio-scsi & vhost-scsi, Zhangfei Gao, 2016/07/27
- Re: [Qemu-devel] ext4 error when testing virtio-scsi & vhost-scsi, Zhangfei Gao, 2016/07/31