kblockd and hald-addon-stor were blocked for more than 120s repeatedly.

Issue

• Our customer encountered an issue that following messages were logged repeatedly.

Oct 10 02:49:12 server02 kernel: INFO: task kblockd/0:30 blocked for more than 120 seconds.
Oct 10 02:49:12 server02 kernel: INFO: task hald-addon-stor:4821 blocked for more than 120 seconds.
Oct 10 02:51:12 server02 kernel: INFO: task kblockd/0:30 blocked for more than 120 seconds.
Oct 10 02:51:12 server02 kernel: INFO: task hald-addon-stor:4821 blocked for more than 120 seconds.
Oct 10 02:53:12 server02 kernel: INFO: task kblockd/0:30 blocked for more than 120 seconds.
Oct 10 02:53:12 server02 kernel: INFO: task hald-addon-stor:4821 blocked for more than 120 seconds.
Oct 10 02:55:12 server02 kernel: INFO: task kblockd/0:30 blocked for more than 120 seconds.
Oct 10 02:55:12 server02 kernel: INFO: task hald-addon-stor:4821 blocked for more than 120 seconds.
Oct 10 02:57:12 server02 kernel: INFO: task kblockd/0:30 blocked for more than 120 seconds.
Oct 10 02:57:12 server02 kernel: INFO: task hald-addon-stor:4821 blocked for more than 120 seconds.

• The customer is using remote media implemented by BMC（Baseboard Management Controller）feature. According to the customer, he faced this issue just after resetting BMC.
• Could you investigate cause of this issue?