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6a70ee03b5
The typical pattern of spinning isolating a list_lru results in a livelock if there are blocks with leaked refcounts. We're rarely seeing this in testing. We can have a modest array in each block that records the stack of the caller that initially allocated the block and dump that stack for any blocks that we're unable to shrink/isolate. Instead of spinning shrinking, we can give it a good try and then print the blocks that remain and carry on with unmount, leaking a few blocks. (Past events have had 2 blocks.) Signed-off-by: Zach Brown <zab@versity.com>