https://bugzilla.kernel.org/show_bug.cgi?id=186551

--- Comment #7 from Eric Sandeen <sandeen@sandeen.net> ---

Those seem to be spaced out at roughly 4G boundaries - 4k short of 4G if my
math is right.  Not sure what that implies though.

You might try with "-v" and/or trying smaller step values with blkdiscard to
see if anything works.

What do /sys/block/nvme0n1/discard_alignment and
/sys/block/nvme0n1/queue/discard_granularity contain?

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