Hi Jens, In kernel v6.11 code was introduced in the sysfs store callbacks for freezing and unfreezing the request queue. This may cause a deadlock in combination with dm-multipath devices and the queue_if_no_path option. This patch series modifies the block layer sysfs store callbacks as follows: - Remove the request queue freeze / unfreeze calls from the block layer sysfs store callbacks if it is safe to do so. - For the sysfs attributes for which it is not safe to remove the queue freeze / unfreeze calls, fail the sysfs write operation if freezing the request queue takes longer than expected. Please consider this patch series for the next merge window. Thanks, Bart. Bart Van Assche (3): block: Remove queue freezing from several sysfs store callbacks block: Restrict the duration of sysfs attribute changes block: Move a misplaced comment in queue_wb_lat_store() block/blk-mq.c | 14 +++++++++++++ block/blk-settings.c | 32 ++++++++++++++++++++++++++++++ block/blk-sysfs.c | 45 ++++++++++++++++-------------------------- include/linux/blk-mq.h | 2 ++ include/linux/blkdev.h | 2 ++ 5 files changed, 67 insertions(+), 28 deletions(-)
