On 2020/8/4 22:31, Johannes Thumshirn wrote: > On 04/08/2020 16:23, Coly Li wrote: >> This is the procedure to reproduce the panic, >> # modprobe scsi_debug delay=0 dev_size_mb=2048 max_queue=1 >> # losetup -f /dev/nvme0n1 --direct-io=on >> # blkdiscard /dev/loop0 -o 0 -l 0x200 > > losetup -f /dev/sdX isn't it? > In my case, I use a NVMe SSD as the backing device of the loop device. Because I don't have a scsi lun. And loading scsi_debug module seems necessary, otherwise the discard process just hang and I cannot see the kernel panic (I don't know why yet). Coly Li
