Thanks Ryan, this is very interesting:

[ 259.411486] bcache: register_bcache() error /dev/vdg: device already 
registered (emitting change event)
[ 259.537070] bcache: register_bcache() error /dev/vdg: device already 
registered (emitting change event)
[ 259.797830] bcache: register_bcache() error /dev/vdg: device already 
registered (emitting change event)
[ 259.900392] bcache: register_bcache() error /dev/vdg: device already 
registered (emitting change event)

It looks that we're trying to register /dev/vdg multiple times as a
backing device (make-bcache -B). I'm not getting this message during my
tests, so that might be required to reproduce that particular deadlock.

I'll modify my test case to trigger these errors and see if I can
reproduce the hung task timeout issue.

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https://bugs.launchpad.net/bugs/1796292

Title:
  Tight timeout for bcache removal causes spurious failures

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