bio_alloc_bioset references current->bio_list[1], so we need to initialize it for the blk-mq submission path as well. Fixes: ff93ea0ce763 ("block: shortcut __submit_bio_noacct for blk-mq drivers") Reported-by: Qian Cai <cai@xxxxxx> Reported-by: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> Signed-off-by: Christoph Hellwig <hch@xxxxxx> Tested-by: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> --- block/blk-core.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/block/blk-core.c b/block/blk-core.c index bf882b8d84450c..9f1bf8658b611a 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1155,11 +1155,10 @@ static blk_qc_t __submit_bio_noacct(struct bio *bio) static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) { struct gendisk *disk = bio->bi_disk; - struct bio_list bio_list; + struct bio_list bio_list[2] = { }; blk_qc_t ret = BLK_QC_T_NONE; - bio_list_init(&bio_list); - current->bio_list = &bio_list; + current->bio_list = bio_list; do { WARN_ON_ONCE(bio->bi_disk != disk); @@ -1174,7 +1173,7 @@ static blk_qc_t __submit_bio_noacct_mq(struct bio *bio) } ret = blk_mq_submit_bio(bio); - } while ((bio = bio_list_pop(&bio_list))); + } while ((bio = bio_list_pop(&bio_list[0]))); current->bio_list = NULL; return ret; -- 2.26.2