> It could be caused by a hardware problem, or if it's a RAID array, if
> the RAID array is out of sync, it's possible for two subsequent reads
> to return something else.

It's RAID0, which I *believe* can't get out of sync, but there is much
I do not understand about RAID.

> Can you take the two .gz files and reconstruct a file system on some
> other system with a known-bug disk, and then try running e2fsck on the
> the image?

e2fsck successfully repairs both the skeleton image and the complete
partition image when they are on a known-good disk.

Here's some more detail about the partition.  The "Partition does not
start on physical sector boundary" thing might be relevant.  (I can't
say I understand how that can even happen, though.)

md127 : active raid0 sde3[1] sdd3[0]
      556720128 blocks super 1.2 512k chunks

# sfdisk -Vl /dev/md127
Disk /dev/md127: 531 GiB, 570081411072 bytes, 1113440256 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 1048576 bytes
Disklabel type: dos
Disk identifier: 0x2c9d8483

Device       Boot     Start        End   Sectors   Size Id Type
/dev/md127p1             63  128005919 128005857    61G 83 Linux
/dev/md127p2      128005920 1113433019 985427100 469.9G 83 Linux

Partition 1 does not start on physical sector boundary.
Partition 2 does not start on physical sector boundary.
Remaining 7236 unallocated 512-byte sectors.

# sfdisk -Vl /dev/sdd
Disk /dev/sdd: 298.1 GiB, 320072933376 bytes, 625142448 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x3ce15391

Device     Boot    Start       End   Sectors   Size Id Type
/dev/sdd1  *        2048   1050623   1048576   512M 83 Linux
/dev/sdd2        1050624  68159487  67108864    32G 82 Linux swap / Solaris
/dev/sdd3       68159488 625142447 556982960 265.6G fd Linux raid autodetect

# sfdisk -Vl /dev/sde
Disk /dev/sde: 298.1 GiB, 320072933376 bytes, 625142448 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x75d309b0

Device     Boot    Start       End   Sectors   Size Id Type
/dev/sde1           2048   1050623   1048576   512M 83 Linux
/dev/sde2        1050624  68159487  67108864    32G 82 Linux swap / Solaris
/dev/sde3       68159488 625142447 556982960 265.6G fd Linux raid autodetect


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