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Groups > linux.debian.kernel > #61731

Bug#900442: linux-image-4.16.0-2-amd64: LVM2 COW snapshots fail as of 4.16

From Salvatore Bonaccorso <carnil@debian.org>
Newsgroups linux.debian.bugs.dist, linux.debian.kernel
Subject Bug#900442: linux-image-4.16.0-2-amd64: LVM2 COW snapshots fail as of 4.16
Date 2018-08-05 17:00 +0200
Message-ID <wjsFH-7iM-9@gated-at.bofh.it> (permalink)
References <vVgw1-4Ya-9@gated-at.bofh.it> <witNv-3Ws-1@gated-at.bofh.it> <vVgw1-4Ya-9@gated-at.bofh.it> <witNv-3Ws-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

Cross-posted to 2 groups.

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Control: forwarded -1 https://www.spinics.net/lists/linux-block/msg29103.html
Control: tags -1 + upstream fixed-upstream confirmed
Control: clone -1 -2
Control: reassign -2 src:lvm2 2.02.176-4.1
Control: retitle -2 lvm2: Ensure COW device is writable even for read-only thick snapshots

Hi,

On Fri, Aug 03, 2018 at 12:44:23AM +0300, WGH wrote:
> This problem is being discussed in kernel mailing list right now:
> https://www.spinics.net/lists/linux-block/msg29103.html (its cause is
> more or less known now)

The upstream fix reverts partially "block: fail op_is_write() requests
to read-only partitions".

https://git.kernel.org/linus/a32e236eb93e62a0f692e79b7c3c9636689559b9

On the lvm2 side, the following commit can be applied:

https://sourceware.org/git/?p=lvm2.git;a=commit;h=a6fdb9d9d70f51c49ad11a87ab4243344e6701a3

(thus cloning the bug as well to src:lvm2 to include this commit or
update to 2.02.178 once released).

Regards,
Salvatore

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Thread

Bug#900442: linux-image-4.16.0-2-amd64: LVM2 COW snapshots fail as of 4.16 "Aaron M. Ucko" <ucko@debian.org> - 2018-05-30 23:10 +0200
  Bug#900442: workaround for snapshot failure Roman Mäder <maeder+deb@mathconsult.ch> - 2018-06-05 09:20 +0200
  Bug#900442: other source of error David Garfield <divad27182@gmx.com> - 2018-06-19 20:40 +0200
  Bug#900442: linux-image-4.16.0-2-amd64: LVM2 COW snapshots fail as of 4.16 WGH <wgh@torlan.ru> - 2018-08-03 00:00 +0200
    Bug#900442: linux-image-4.16.0-2-amd64: LVM2 COW snapshots fail as of 4.16 Salvatore Bonaccorso <carnil@debian.org> - 2018-08-05 17:00 +0200
  Processed: Re: Bug#900442: linux-image-4.16.0-2-amd64: LVM2 COW  snapshots fail as of 4.16 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2018-08-05 17:00 +0200

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