On 02/22/18 02:58, Jaco Kroon wrote:
We've been seeing sporadic IO lockups on recent kernels.

Are you using the legacy I/O stack or blk-mq? If you are not yet using blk-mq, can you switch to blk-mq + scsi-mq + dm-mq? If the lockup is reproducible with blk-mq, can you share the output of the following command:

(cd /sys/kernel/debug/block && find . -type f -exec grep -aH . {} \;)



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