I did bisect for this bug and find the following commit cause this problem.
commit f0c0a376d0fcd4c5579ecf5e95f88387cba85211
Author: Mike Christie <michaelc@xxxxxxxxxxx>
Date: Sun Aug 17 15:24:38 2008 -0500
[SCSI] Add helper code so transport classes/driver can control queueing (v3)
SCSI-ml manages the queueing limits for the device and host, but
does not do so at the target level. However something something similar
can come in userful when a driver is transitioning a transport object to
the the blocked state, becuase at that time we do not want to queue
io and we do not want the queuecommand to be called again.
Alex
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