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grub-probe fails with degraded btrfs

From: Brendan Hide
Subject: grub-probe fails with degraded btrfs
Date: Mon, 31 Dec 2012 11:13:07 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0

Hi all

I'm hoping this bug has already been fixed. I couldn't find any reference to it online, thus my mail.

Whilst installing Archlinux onto a degraded btrfs (the second disk in a "raid1" configuration was "missing" at the time), I found that grub-mkconfig failed. The output was:
"/usr/sbin/grub-probe: error: could not find canonical path of ."

After a btrfs device delete/balance, grub-mkconfig succeeded without issue. This is, admittedly, an unusual scenario.

In testing post-install I have been unable to reproduce the issue and unfortunately I don't have another spare disk to test with. See attached log where I attempted, unsuccessfully, to reproduce with loop devices.

Similar error message here two weeks ago http://ubuntuforums.org/showthread.php?t=2094451 though not necessarily related.

Brendan Hide

Attachment: btrfs-grub-probe.0.txt
Description: Text document

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