[dm-devel] dm thin-volume hung as swap: bug or as-design ?

[Alasdair G Kergon]

On Fri, Jan 29, 2021 at 06:40:06PM +0800, Coly Li wrote:
> Recently I receive a report that whole system hung and no response after
> a while with I/O load. The special configuration is the dm thin-pool
> volume is used as the swap partition of the system.
> My questions are,
> - Can a thin-pool volume be used as swap device?

Yes in principle, but it won't get much testing as it's not 
necessarily a particularly sensible configuration.
- You'd normally prefer fully-pre-allocated disk space for swap
  and turn off the zeroing.

Is there some use-case where it does make more sense?

> - The above description is a bug, or an already know issue which should
> be avoided ?
 
Bug.

Alasdair