Re: [PATCH] block: tolerate 0 byte discard_granularity in __blkdev_issue_discard()

[Coly Li]

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