This patch didn't fix it. It made it tons better, but I again have a
wedged box. Same symptoms - against IDE this time.
blk_plug_list is empty. queue_flags=0x03. Interestingly,
q->plug_list is non-empty, non-zero, both list members pointing at
a list which isn't either itself or blk_plug_list.
I note that the code isn't taking queues off the plug list when the queue
is destroyed. Guess that doesn't matter - we never destroy a plugged
This one is killing me.
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