From: Paolo Bonzini <pbonzini@redhat.com>
To: Roman Mamedov <rm@romanrm.net>
Cc: linux-btrfs@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: Kernel 4.4.0 KVM guest on Btrfs locks up on snapshotting
Date: Wed, 20 Jan 2016 18:28:33 +0100 [thread overview]
Message-ID: <569FC3C1.2000804@redhat.com> (raw)
In-Reply-To: <20160120185810.2c566f98@natsu>
On 20/01/2016 14:58, Roman Mamedov wrote:
> On Wed, 20 Jan 2016 03:28:04 -0500 (EST) Paolo Bonzini
> <pbonzini@redhat.com> wrote:
>
>> Can you reproduce it on the host without QEMU in the middle?
>
> I did not try to stress-test this on purpose yet, but this is an
> actively used system which is snapshotting its /home, VMs and root
> subvolumes every hour, so far no lock-ups of any other application
> than KVM, and with KVM it's trivially easy to hit, in fact first
> two lockups occured in the first two hours of using the kernel
> 4.4.0 at the hourly snapshots...
>
>> Also, can you find the value of the "FUA" file in sysfs (e.g.
>> with "cat /sys/block/sda/device/scsi_disk/*/FUA")?
>
> It is 0 both in IDE and SCSI modes.
And in the host?
Paolo
next prev parent reply other threads:[~2016-01-20 17:28 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-19 22:02 Kernel 4.4.0 KVM guest on Btrfs locks up on snapshotting Roman Mamedov
2016-01-19 22:18 ` Paolo Bonzini
2016-01-19 23:03 ` Roman Mamedov
2016-01-20 8:28 ` Paolo Bonzini
2016-01-20 13:58 ` Roman Mamedov
2016-01-20 17:28 ` Paolo Bonzini [this message]
2016-01-20 18:46 ` Roman Mamedov
2016-01-20 20:38 ` Paolo Bonzini
2016-01-20 0:19 ` Liu Bo
2016-01-20 5:08 ` Roman Mamedov
2016-01-20 11:34 ` Paolo Bonzini
2016-01-20 15:08 ` Roman Mamedov
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