Public bug reported:
# lsb_release -rd
Description: Ubuntu 14.04.5 LTS
Release: 14.04
# apt-cache policy btrfs-tools
btrfs-tools:
Installed: 3.12-1ubuntu0.1
Candidate: 3.12-1ubuntu0.1
Version table:
*** 3.12-1ubuntu0.1 0
500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
100 /var/lib/dpkg/status
3.12-1 0
500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
# mkfs.btrfs --force /dev/vdd succeeds
# # mkfs.btrfs --force /dev/vdd
Error: error checking /dev/vdd mount status
# strace -f mkfs.btrfs --force /dev/vdd
<snip>
stat("/dev/loop0", {st_mode=S_IFBLK|0660, st_rdev=makedev(7, 0), ...}) = 0
lstat("/dev", {st_mode=S_IFDIR|0755, st_size=4180, ...}) = 0
lstat("/dev/loop0", {st_mode=S_IFBLK|0660, st_rdev=makedev(7, 0), ...}) = 0
open("/sys/block//loop0/loop/backing_file", O_RDONLY) = 5
fstat(5, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x7fe8bd73c000
read(5, "/root.tmp.img (deleted)\n", 4096) = 24
close(5) = 0
munmap(0x7fe8bd73c000, 4096) = 0
lstat("/dev", {st_mode=S_IFDIR|0755, st_size=4180, ...}) = 0
lstat("/dev/vdd", {st_mode=S_IFBLK|0660, st_rdev=makedev(253, 48), ...}) = 0
lstat("/root.tmp.img (deleted)", 0x7ffeaa3f0bf0) = -1 ENOENT (No such file or
directory)
close(4) = 0
munmap(0x7fe8bd73d000, 4096) = 0
close(3) = 0
write(2, "Error: error checking /dev/vdd m"..., 44Error: error checking
/dev/vdd mount status
) = 44
exit_group(1) = ?
+++ exited with 1 +++
It appears that mkfs.btrfs doesn't like the loop device, /dev/loop0
which has a deleted backing file.
root@ubuntu:~# cat /sys/block/loop0/loop/backing_file
/root.tmp.img (deleted)
root@ubuntu:~# ls -al /root.tmp.img
ls: cannot access /root.tmp.img: No such file or directory
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: btrfs-tools 3.12-1ubuntu0.1
ProcVersionSignature: Ubuntu 3.13.0-135.184-generic 3.13.11-ckt39
Uname: Linux 3.13.0-135-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.27
Architecture: amd64
Date: Wed Nov 29 02:58:04 2017
ProcEnviron:
TERM=vt102
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: btrfs-tools
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: btrfs-tools (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug curtin trusty uec-images
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https://bugs.launchpad.net/bugs/1735046
Title:
mkfs.btrfs error checking mount status of loop device backing_file
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