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. -- Segmentation fault -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html