Hi all, When I do the following: cryptsetup open /dev/sdX[Y] rand --type plain --key-file /dev/random; blkdiscard -z /dev/mapper/rand Some OOM killings and a kernel panic occur. Here is a screenshot: https://gitlab.com/cryptsetup/cryptsetup/uploads/207ffdada52f3172f54a014c67159625/DSC_0129.JPG Similar issue is NOT found in doing `cat /dev/zero > /dev/mapper/rand`, or `blkdiscard -z /dev/sdX[Y]` (without opening a dm-crypt on it), on the same hardware and configuration. Note that `blkdiscard -z` does not trigger the BLKDISCARD ioctl but the BLKZEROOUT ioctl. And the devices I have been testing on are USB devices that does NOT support WRITE SAME or UNMAP. Regards, Tom Yan -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
