[Bug 1813863] [NEW] Unable to mount a btrfs filesystem smaller than 320M on Xenial P8

Public bug reported:

This issue will happen to a btrfs filesystem <= 320M, and this was not
spotted on any other architecture / kernel. Only this one.

# TMPIMG0=/tmp/test0.img
# DEV0=`losetup -f`
# truncate --size 256M $TMPIMG0
# losetup $DEV0 $TMPIMG0
# mkfs.btrfs -f $DEV0
btrfs-progs v4.4
See http://btrfs.wiki.kernel.org for more information.

Performing full device TRIM (256.00MiB) ...
Label: (null)
UUID: ca007094-ddd4-42e9-bd6d-78c6de03dc66
Node size: 65536
Sector size: 65536
Filesystem size: 256.00MiB
Block group profiles:
  Data: single 8.00MiB
  Metadata: DUP 40.00MiB
  System: DUP 12.00MiB
SSD detected: no
Incompat features: extref, skinny-metadata
Number of devices: 1
Devices:
   ID SIZE PATH
    1 256.00MiB /dev/loop1

# mount $DEV0 $MNT
mount: mount /dev/loop1 on /tmp/mnt failed: No space left on device

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-141-generic 4.4.0-141.167
ProcVersionSignature: Ubuntu 4.4.0-141.167-generic 4.4.162
Uname: Linux 4.4.0-141-generic ppc64le
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Jan 30 03:23 seq
 crw-rw---- 1 root audio 116, 33 Jan 30 03:23 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: ppc64el
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Wed Jan 30 03:35:17 2019
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb:
 Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
PciMultimedia:

ProcFB:

ProcKernelCmdLine: root=/dev/mapper/mpath0-part2 ro console=hvc0
ProcLoadAvg: 0.00 0.05 0.09 1/1339 5297
ProcSwaps:
 Filename Type Size Used Priority
 /swap.img file 8388544 0 -1
ProcVersion: Linux version 4.4.0-141-generic (buildd@bos02-ppc64el-009) (gcc version 5.4.0 20160609 (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.10) ) #167-Ubuntu SMP Wed Dec 5 10:33:00 UTC 2018
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-141-generic N/A
 linux-backports-modules-4.4.0-141-generic N/A
 linux-firmware 1.157.21
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
cpu_cores: Number of cores present = 20
cpu_coreson: Number of cores online = 20
cpu_dscr: DSCR is 0
cpu_freq:
 min: 3.694 GHz (cpu 159)
 max: 3.694 GHz (cpu 1)
 avg: 3.694 GHz
cpu_runmode:
 Could not retrieve current diagnostics mode,
 No kernel interface to firmware
cpu_smt: SMT=8

** Affects: linux (Ubuntu)
Importance: Undecided
Status: New


** Tags: apport-bug ppc64el uec-images xenial

** Description changed:

- This issue will happen to a btrfs filesystem <= 320M
+ This issue will happen to a btrfs filesystem <= 320M, and this was not
+ spotted on any other architecture / kernel. Only this one.

# TMPIMG0=/tmp/test0.img
# DEV0=`losetup -f`
# truncate --size 256M $TMPIMG0
# losetup $DEV0 $TMPIMG0
# mkfs.btrfs -f $DEV0
btrfs-progs v4.4
See http://btrfs.wiki.kernel.org for more information.

Performing full device TRIM (256.00MiB) ...
Label: (null)
UUID: ca007094-ddd4-42e9-bd6d-78c6de03dc66
Node size: 65536
Sector size: 65536
Filesystem size: 256.00MiB
Block group profiles:
- Data: single 8.00MiB
- Metadata: DUP 40.00MiB
- System: DUP 12.00MiB
+   Data: single 8.00MiB
+   Metadata: DUP 40.00MiB
+   System: DUP 12.00MiB
SSD detected: no
Incompat features: extref, skinny-metadata
Number of devices: 1
Devices:
- ID SIZE PATH
- 1 256.00MiB /dev/loop1
+    ID SIZE PATH
+     1 256.00MiB /dev/loop1

# mount $DEV0 $MNT
mount: mount /dev/loop1 on /tmp/mnt failed: No space left on device

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-141-generic 4.4.0-141.167
ProcVersionSignature: Ubuntu 4.4.0-141.167-generic 4.4.162
Uname: Linux 4.4.0-141-generic ppc64le
AlsaDevices:
- total 0
- crw-rw---- 1 root audio 116, 1 Jan 30 03:23 seq
- crw-rw---- 1 root audio 116, 33 Jan 30 03:23 timer
+  total 0
+  crw-rw---- 1 root audio 116, 1 Jan 30 03:23 seq
+  crw-rw---- 1 root audio 116, 33 Jan 30 03:23 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: ppc64el
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Wed Jan 30 03:35:17 2019
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb:
- Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
- Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
- Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
- Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
+  Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
PciMultimedia:
-
+
ProcFB:
-
+
ProcKernelCmdLine: root=/dev/mapper/mpath0-part2 ro console=hvc0
ProcLoadAvg: 0.00 0.05 0.09 1/1339 5297
ProcSwaps:
- Filename Type Size Used Priority
- /swap.img file 8388544 0 -1
+  Filename Type Size Used Priority
+  /swap.img file 8388544 0 -1
ProcVersion: Linux version 4.4.0-141-generic (buildd@bos02-ppc64el-009) (gcc version 5.4.0 20160609 (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.10) ) #167-Ubuntu SMP Wed Dec 5 10:33:00 UTC 2018
RelatedPackageVersions:
- linux-restricted-modules-4.4.0-141-generic N/A
- linux-backports-modules-4.4.0-141-generic N/A
- linux-firmware 1.157.21
+  linux-restricted-modules-4.4.0-141-generic N/A
+  linux-backports-modules-4.4.0-141-generic N/A
+  linux-firmware 1.157.21
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
cpu_cores: Number of cores present = 20
cpu_coreson: Number of cores online = 20
cpu_dscr: DSCR is 0
cpu_freq:
- min: 3.694 GHz (cpu 159)
- max: 3.694 GHz (cpu 1)
- avg: 3.694 GHz
+  min: 3.694 GHz (cpu 159)
+  max: 3.694 GHz (cpu 1)
+  avg: 3.694 GHz
cpu_runmode:
- Could not retrieve current diagnostics mode,
- No kernel interface to firmware
+  Could not retrieve current diagnostics mode,
+  No kernel interface to firmware
cpu_smt: SMT=8

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https://bugs.launchpad.net/bugs/1813863

Title:
Unable to mount a btrfs filesystem smaller than 320M on Xenial P8

Status in linux package in Ubuntu:
New

Bug description:
This issue will happen to a btrfs filesystem <= 320M, and this was not
spotted on any other architecture / kernel. Only this one.

# TMPIMG0=/tmp/test0.img
# DEV0=`losetup -f`
# truncate --size 256M $TMPIMG0
# losetup $DEV0 $TMPIMG0
# mkfs.btrfs -f $DEV0
btrfs-progs v4.4
See http://btrfs.wiki.kernel.org for more information.

Performing full device TRIM (256.00MiB) ...
Label: (null)
UUID: ca007094-ddd4-42e9-bd6d-78c6de03dc66
Node size: 65536
Sector size: 65536
Filesystem size: 256.00MiB
Block group profiles:
  Data: single 8.00MiB
  Metadata: DUP 40.00MiB
  System: DUP 12.00MiB
SSD detected: no
Incompat features: extref, skinny-metadata
Number of devices: 1
Devices:
   ID SIZE PATH
    1 256.00MiB /dev/loop1

# mount $DEV0 $MNT
mount: mount /dev/loop1 on /tmp/mnt failed: No space left on device

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-141-generic 4.4.0-141.167
ProcVersionSignature: Ubuntu 4.4.0-141.167-generic 4.4.162
Uname: Linux 4.4.0-141-generic ppc64le
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Jan 30 03:23 seq
 crw-rw---- 1 root audio 116, 33 Jan 30 03:23 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: ppc64el
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Wed Jan 30 03:35:17 2019
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb:
 Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
PciMultimedia:

ProcFB:

ProcKernelCmdLine: root=/dev/mapper/mpath0-part2 ro console=hvc0
ProcLoadAvg: 0.00 0.05 0.09 1/1339 5297
ProcSwaps:
 Filename Type Size Used Priority
 /swap.img file 8388544 0 -1
ProcVersion: Linux version 4.4.0-141-generic (buildd@bos02-ppc64el-009) (gcc version 5.4.0 20160609 (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.10) ) #167-Ubuntu SMP Wed Dec 5 10:33:00 UTC 2018
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-141-generic N/A
 linux-backports-modules-4.4.0-141-generic N/A
 linux-firmware 1.157.21
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
cpu_cores: Number of cores present = 20
cpu_coreson: Number of cores online = 20
cpu_dscr: DSCR is 0
cpu_freq:
 min: 3.694 GHz (cpu 159)
 max: 3.694 GHz (cpu 1)
 avg: 3.694 GHz
cpu_runmode:
 Could not retrieve current diagnostics mode,
 No kernel interface to firmware
cpu_smt: SMT=8

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