Linux kernel commit 8a9ebe717a133ba7bc90b06047f43cc6b8bcb8b3
attrib->max_unmap_lba_count = (q->limits.max_discard_sectors << 9)
Since max_discard_sectors is 32-bit, there may be integer overflow,
making wrong max_unmap_lba_count.
For example, LVM Thin provisioning reports that it have 16 GB maximal
discard block.
Exactly the same bug in DRBD9, I have already reported.
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Segmentation fault