On Mon, 14 Oct 2024 17:29:31 +0800, Muchun Song wrote: > We encounter a problem on our servers where hundreds of UNINTERRUPTED > processes are all waiting in the WBT wait queue. And the IO hung detector > logged so many messages about "blocked for more than 122 seconds". The > call trace is as follows: > > Call Trace: > __schedule+0x959/0xee0 > schedule+0x40/0xb0 > io_schedule+0x12/0x40 > rq_qos_wait+0xaf/0x140 > wbt_wait+0x92/0xc0 > __rq_qos_throttle+0x20/0x30 > blk_mq_make_request+0x12a/0x5c0 > generic_make_request_nocheck+0x172/0x3f0 > submit_bio+0x42/0x1c0 > ... > > [...] Applied, thanks! [1/3] block: fix missing dispatching request when queue is started or unquiesced commit: 4bddfec1a0fb837f66b403a11ee1834769df2330 [2/3] block: fix ordering between checking QUEUE_FLAG_QUIESCED and adding requests commit: 542c1c1b4cca00051997f4e1ad330a518e727c79 [3/3] block: fix ordering between checking BLK_MQ_S_STOPPED and adding requests commit: 1936f2e6981297621deed9afcdc9063c1964fc5b Best regards, -- Jens Axboe