Hi! On Mon, 2025-01-13 at 16:41 +0800, Ming Lei wrote: > sysfs ->store is called with queue freezed, meantime we have several > ->store() callbacks(update_nr_requests, wbt, scheduler) to allocate > memory with GFP_KERNEL which may run into direct reclaim code path, > then potential deadlock can be caused. > > Fix the issue by marking NOIO around sysfs ->store() > > Reviewed-by: Christoph Hellwig <hch@xxxxxx> > Reviewed-by: John Garry <john.g.garry@xxxxxxxxxx> > Reported-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx> > Closes: > https://lore.kernel.org/linux-block/ead7c5ce5138912c1f3179d62370b84a64014a38.camel@xxxxxxxxxxxxxxx/ > Fixes: bd166ef183c2 ("blk-mq-sched: add framework for MQ capable IO > schedulers") Does this fix also the #2 lockdep splat in that email? Thanks, Thomas
