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blk-mq tags allocation bug - Coggle Diagram
blk-mq tags allocation bug
observation
sbitmap queue
sbq->ws_active is 1
all tags are free
tag 0 is set in both word and cleared
reserved tags
nr_reserved is 2
sbq->wake_batch == 1
sq->wake_index is 0
request queue
admin_q
nr_hw_queues is 1
flags is 0x440
SAME_COMP & IO_STAT
nr_requests is 30
blk_mq_hw_ctx
wait_index is 1
nr_active is 0
flags ix 0x42
TAG_SHARED is 1
fabrics_q & admin_q share same tags
NO_SCHED
state is 0
fabric_q
struct blk_mq_tags
.active_queues is 0