On 05/06/14 15:22, Mike Snitzer wrote: > On Tue, May 06 2014 at 5:31am -0400, > Bart Van Assche <bvanassche@xxxxxxx> wrote: >> Has anyone else perhaps already run into this ? > > Not seen this, how easily is it reproduced? > > These recent commits are clearly the issue: > > e809917735e dm mpath: push back requests instead of queueing > 3e9f1be1b40 dm mpath: remove process_queued_ios() > > Need to take a closer look at the lockdep splat you provided. All I did was to simulate a cable pull while running a fio test on top of a dm-multipath device on top of a few SCSI devices. This lockdep report was generated the first time I ran the cable pull simulation. I have not yet tried to reproduce this but it's not impossible that this is 100% reproducible. The same test runs fine with kernel 3.14. Bart. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
