On Fri, Aug 15, 2025 at 04:02:06PM +0800, Yu Kuai wrote: > From: Yu Kuai <yukuai3@xxxxxxxxxx> > > In the case user trigger tags grow by queue sysfs attribute nr_requests, > hctx->sched_tags will be freed directly and replaced with a new > allocated tags, see blk_mq_tag_update_depth(). > > The problem is that hctx->sched_tags is from elevator->et->tags, while > et->tags is still the freed tags, hence later elevator exist will try to > free the tags again, causing kernel panic. > > patch 1-6 are prep cleanup and refactor patches for updating nr_requests > patch 7,8 are the fix patches for the regression > patch 9 is cleanup patch after patch 8 > patch 10 fix the stale nr_requests documentation Please do not mix bug(regression) fix with cleanup. The bug fix for updating nr_requests should have been simple enough in single or two patches, why do you make 10-patches for dealing with the regression? Not mention this way is really unfriendly for stable tree backport. Thanks, Ming
