On 10/21/24 23:41, Ming Lei wrote: > block/027 focuses on race condition between blkg association and > request_queue shutdown. Unfortunately it is a bit easy to trigger > lockup by setting scsi_debug in the following way: > > - single queue > - 21 LUNs > - small queue depth(110) > - 10us completion delay > - fio: 4 jobs, with iodepth 2048 > > The above setting creates big contention on tag allocation of blk-mq > code path, especially scsi_debug takes memcpy to simulate IO, which > doesn't match device in reality. > > So setup scsi_debug with MQ and avoid to trigger lockup which doesn't > exist in real storage device usually. > > Signed-off-by: Ming Lei<ming.lei@xxxxxxxxxx> Looks good. Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx> -ck
