5fbc7c59fd22c5a6531b40b0759624b680a95e52 ubuntu_btrfs_kernel_fixes btrfs scrub fails with n/fips

[Magali Lemes do Sacramento]

This issue can be found on noble/fips since version 6.8.0-31.31+fips3 from the d2024.02.29 cycle on openstack instances.
We get the following output:

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 1.47.0 (5-Feb-2023)
Discarding device blocks: 0/524288 done
Creating filesystem with 524288 4k blocks and 131072 inodes
Filesystem UUID: 118d4e8c-9a17-4f63-bf41-5d041e502b3d
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

WARNING: device 2 not present
ERROR: scrubbing /tmp/mnt-5fbc7c59fd22c5a6531b40b0759624b680a95e52 failed for device id 5: ret=-1, errno=5 (Input/output error)
Starting scrub on devid 1
Starting scrub on devid 2
Starting scrub on devid 3
Starting scrub on devid 4
Starting scrub on devid 5

Scrub device /dev/loop0 (id 1) done
Scrub started: Mon Jul 22 08:14:55 2024
Status: finished
Duration: 0:00:00
    data_extents_scrubbed: 0
    tree_extents_scrubbed: 3
    data_bytes_scrubbed: 0
    tree_bytes_scrubbed: 49152
    read_errors: 0
    csum_errors: 0
    verify_errors: 0
    no_csum: 0
    csum_discards: 0
    super_errors: 0
    malloc_errors: 0
    uncorrectable_errors: 0
    unverified_errors: 0
    corrected_errors: 0
    last_physical: 293732352

Scrub device (id 2) canceled
Scrub started: Mon Jul 22 08:14:55 2024
Status: aborted
Duration: 0:00:00
    data_extents_scrubbed: 0
    tree_extents_scrubbed: 0
    data_bytes_scrubbed: 0
    tree_bytes_scrubbed: 0
    read_errors: 0
    csum_errors: 0
    verify_errors: 0
    no_csum: 0
    csum_discards: 0
    super_errors: 0
    malloc_errors: 0
    uncorrectable_errors: 0
    unverified_errors: 0
    corrected_errors: 0
    last_physical: 0

Scrub device /dev/loop2 (id 3) done
Scrub started: Mon Jul 22 08:14:55 2024
Status: finished
Duration: 0:00:00
    data_extents_scrubbed: 0
    tree_extents_scrubbed: 4
    data_bytes_scrubbed: 0
    tree_bytes_scrubbed: 65536
    read_errors: 0
    csum_errors: 0
    verify_errors: 0
    no_csum: 0
    csum_discards: 0
    super_errors: 0
    malloc_errors: 0
    uncorrectable_errors: 0
    unverified_errors: 0
    corrected_errors: 0
    last_physical: 272760832

Scrub device /dev/loop3 (id 4) done
Scrub started: Mon Jul 22 08:14:55 2024
Status: finished
Duration: 0:00:00
    data_extents_scrubbed: 0
    tree_extents_scrubbed: 0
    data_bytes_scrubbed: 0
    tree_bytes_scrubbed: 0
    read_errors: 0
    csum_errors: 0
    verify_errors: 0
    no_csum: 0
    csum_discards: 0
    super_errors: 0
    malloc_errors: 0
    uncorrectable_errors: 0
    unverified_errors: 0
    corrected_errors: 0
    last_physical: 272760832

Scrub device /dev/loop4 (id 5) canceled
Scrub started: Mon Jul 22 08:14:55 2024
Status: aborted
Duration: 0:00:00
    data_extents_scrubbed: 0
    tree_extents_scrubbed: 0
    data_bytes_scrubbed: 0
    tree_bytes_scrubbed: 0
    read_errors: 0
    csum_errors: 0
    verify_errors: 0
    no_csum: 0
    csum_discards: 0
    super_errors: 0
    malloc_errors: 0
    uncorrectable_errors: 0
    unverified_errors: 0
    corrected_errors: 0
    last_physical: 0
btrfs scrub start on /tmp/mnt-5fbc7c59fd22c5a6531b40b0759624b680a95e52 failed

FAIL: 5fbc7c59fd22c5a6531b40b0759624b680a95e52 (ret=1)

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LP: #2037064 reports failures with the same testcase, but the error messages are different.