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Re: [Qemu-block] qemu-img info ran at 100% CPU for 45 minutes without wr
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From: |
Alberto Garcia |
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Subject: |
Re: [Qemu-block] qemu-img info ran at 100% CPU for 45 minutes without writing a byte (stopped it) |
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Date: |
Fri, 18 Jan 2019 16:25:58 +0100 |
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User-agent: |
Notmuch/0.18.2 (http://notmuchmail.org) Emacs/24.4.1 (i586-pc-linux-gnu) |
On Wed 16 Jan 2019 02:15:24 AM CET, james harvey wrote:
> I ran:
>
> # qemu-img convert /var/lib/libvirt/images/win7.qcow2 -O raw
> /mnt/tmpqcow/win7.raw
>
> 45 minutes later, qemu-img had been running with 100% CPU every time I
> checked, and it had allocated the raw file, but still hadn't actually
> written a single byte: (note the dd in the VM completed the 90GB in
> about 8 minutes)
[...]
> After running this long, I ran strace for 15 seconds, here:
> https://termbin.com/gg9k -- It's repeatedly running lseek with
> SEEK_DATA and SEEK_HOLE. The SEEK_HOLE always results in 96251936768,
> and SEEK_DATA is different results.
It seems like the problem addressed by this patch:
https://lists.gnu.org/archive/html/qemu-block/2019-01/msg00246.html
Berto