5fbc7c59fd22c5a6531b40b0759624b680a95e52 in btrfs_kernel_fixes failed on B

[Po-Hsu Lin]

Test failed with mount operation:
    mount: /tmp/mnt-5fbc7c59fd22c5a6531b40b0759624b680a95e52: wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error.

This patch could be found in Bionic tree:
https://kernel.ubuntu.com/git/ubuntu/ubuntu-bionic.git/commit/?id=5fbc7c59fd22c5a6531b40b0759624b680a95e52

Invoking test 5fbc7c59fd22c5a6531b40b0759624b680a95e52

fix 5fbc7c59fd22c5a6531b40b0759624b680a95e52

    Btrfs: fix unfinished readahead thread for raid5/6 degraded mounting

    Steps to reproduce:

     # mkfs.btrfs -f /dev/sd[b-f] -m raid5 -d raid5
     # mkfs.ext4 /dev/sdc --->corrupt one of btrfs device
     # mount /dev/sdb /mnt -o degraded
     # btrfs scrub start -BRd /mnt

    This is because readahead would skip missing device, this is not true
    for RAID5/6, because REQ_GET_READ_MIRRORS return 1 for RAID5/6 block
    mapping. If expected data locates in missing device, readahead thread
    would not call __readahead_hook() which makes event @rc->elems=0
    wait forever.

    Fix this problem by checking return value of btrfs_map_block(),we
    can only skip missing device safely if there are several mirrors.

mke2fs 1.44.1 (24-Mar-2018)
Discarding device blocks: 4096/524288************* *************done
Creating filesystem with 524288 4k blocks and 131072 inodes
Filesystem UUID: c4b9a22f-cacb-44d6-80b9-cca217a61f5b
Superblock backups stored on blocks:
 32768, 98304, 163840, 229376, 294912

Allocating group tables: 0/16***** *****done
Writing inode tables: 0/16***** *****done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: 0/16***** *****done

mount: /tmp/mnt-5fbc7c59fd22c5a6531b40b0759624b680a95e52: wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error.
ERROR: not a btrfs filesystem: /tmp/mnt-5fbc7c59fd22c5a6531b40b0759624b680a95e52
btrfs scrub start on /tmp/mnt-5fbc7c59fd22c5a6531b40b0759624b680a95e52 failed
umount: /tmp/mnt-5fbc7c59fd22c5a6531b40b0759624b680a95e52: not mounted.

FAIL: 5fbc7c59fd22c5a6531b40b0759624b680a95e52 (ret=1)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-43-generic 4.15.0-43.46
ProcVersionSignature: User Name 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Dec 31 02:11 seq
 crw-rw---- 1 root audio 116, 33 Dec 31 02:11 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
Date: Thu Jan 3 07:37:01 2019
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
PciMultimedia:

ProcFB: 0 cirrusdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-43-generic root=UUID=2f68c627-8ab4-40d5-8c06-6563436d0f96 ro console=ttyS0,115200n8
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-43-generic N/A
 linux-backports-modules-4.15.0-43-generic N/A
 linux-firmware 1.173.2
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-xenial
dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-xenial
dmi.sys.vendor: QEMU

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.