From: Laibin Qiu qiulaibin@huawei.com
hulk inclusion category: bugfix bugzilla: 185857 https://gitee.com/openeuler/kernel/issues/I4MMUW CVE: NA
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Now that we disable wbt by set WBT_STATE_OFF_DEFAULT in wbt_disable_default() when switch elevator to bfq. And when we remove scsi device, wbt will be enabled by wbt_enable_default. If it become false positive between wbt_wait() and wbt_track() when submit write request.
The following is the scenario that triggered the problem.
T1 T2 T3 elevator_switch_mq bfq_init_queue wbt_disable_default <= Set rwb->enable_state (OFF) Submit_bio blk_mq_make_request rq_qos_throttle <= rwb->enable_state (OFF) scsi_remove_device sd_remove del_gendisk blk_unregister_queue elv_unregister_queue wbt_enable_default <= Set rwb->enable_state (ON) q_qos_track <= rwb->enable_state (ON) ^^^^^^ this request will mark WBT_TRACKED without inflight add and will lead to drop rqw->inflight to -1 in wbt_done() which will trigger IO hung.
Fix this by move wbt_enable_default() from elv_unregister to bfq_exit_queue(). Only re-enable wbt when bfq exit. Fixes: 76a8040817b4b ("blk-wbt: make sure throttle is enabled properly") Signed-off-by: Laibin Qiu qiulaibin@huawei.com Reviewed-by: Jason Yan yanaijie@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- block/bfq-iosched.c | 4 ++++ block/elevator.c | 2 -- 2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index aa1a808fa072..70f2aeadd21c 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -6369,6 +6369,7 @@ static void bfq_exit_queue(struct elevator_queue *e) { struct bfq_data *bfqd = e->elevator_data; struct bfq_queue *bfqq, *n; + struct request_queue *q = bfqd->queue;
hrtimer_cancel(&bfqd->idle_slice_timer);
@@ -6392,6 +6393,9 @@ static void bfq_exit_queue(struct elevator_queue *e) #endif
kfree(bfqd); + + /* Re-enable throttling in case elevator disabled it */ + wbt_enable_default(q); }
static void bfq_init_root_group(struct bfq_group *root_group, diff --git a/block/elevator.c b/block/elevator.c index 65dfc7559a36..76f70f679a1b 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -523,8 +523,6 @@ void elv_unregister_queue(struct request_queue *q) kobject_del(&e->kobj);
e->registered = 0; - /* Re-enable throttling in case elevator disabled it */ - wbt_enable_default(q); } }