From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from meiko.romanrm.net ([195.154.92.155]:56836 "EHLO meiko.romanrm.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933267AbcATFI6 (ORCPT ); Wed, 20 Jan 2016 00:08:58 -0500 Date: Wed, 20 Jan 2016 10:08:52 +0500 From: Roman Mamedov To: bo.li.liu@oracle.com Cc: linux-btrfs@vger.kernel.org, kvm@vger.kernel.org Subject: Re: Kernel 4.4.0 KVM guest on Btrfs locks up on snapshotting Message-ID: <20160120100852.470479a6@natsu> In-Reply-To: <20160120001944.GA9884@localhost.localdomain> References: <20160120030223.22cc3ae0@natsu> <20160120001944.GA9884@localhost.localdomain> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; boundary="Sig_/Qxt6WjpEZFnvYT1DZ5l0Qi0"; protocol="application/pgp-signature" Sender: linux-btrfs-owner@vger.kernel.org List-ID: --Sig_/Qxt6WjpEZFnvYT1DZ5l0Qi0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Tue, 19 Jan 2016 16:19:44 -0800 Liu Bo wrote: > What about 'btrfs fi df' 's output on the directory where $NAME.img is > located? $ sudo btrfs fi df . Data, single: total=3D8.59TiB, used=3D8.47TiB System, DUP: total=3D32.00MiB, used=3D624.00KiB Metadata, DUP: total=3D13.00GiB, used=3D9.87GiB GlobalReserve, single: total=3D512.00MiB, used=3D0.00B $ df -h . Filesystem Size Used Avail Use% Mounted on - 9.1T 8.5T 571G 94% /mnt/r5/vm The guest VM disk itself is 8 GB in size. > According to my experience, kvm guest can be 'no response' when no space > on the backend's filesystem, but you said that the alternative way > work, so it doesn't look like a no space issue. I don't get any ENOSPC errors on the host, also it doesn't seem to be a slowdown caused by disk I/O searching for free space, just a complete lock-= up: I monitor the guest with 'ping', and when it happens, the ping responses st= op immediately and do not return, also there is no reaction to any keypress in= the KVM VNC window. --=20 With respect, Roman --Sig_/Qxt6WjpEZFnvYT1DZ5l0Qi0 Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAlafFmQACgkQTLKSvz+PZwiD0gCeOC53WYFA45bOgrO8EtpMeZea BJgAnj9rUYJsxI7ca9muULc7mG3Oil7P =vqbu -----END PGP SIGNATURE----- --Sig_/Qxt6WjpEZFnvYT1DZ5l0Qi0--