Hi,

On (02/04/18 22:21), huang ying wrote:
[..]
> >> After disabling zswap no crashes at all.
> >>
> >> /etc/systemd/swap.conf
> >> zswap_enabled=1
> >> zswap_compressor=lz4      # lzo lz4
> >> zswap_max_pool_percent=25 # 1-99
> >> zswap_zpool=zbud          # zbud z3fold
> >
[..]
> Can you give me some detailed steps to reproduce this?  Like the
> kernel configuration file, swap configuration, etc.  Any kernel
> WARNING during testing?  Can you reproduce this with a real swap
> device instead of zswap?

No warnings (at least no warnings with my .config). Tested it only with
zram based swap (I'm running swap-less x86 systems, so zram is the easiest
way). It seems it's THP + frontswap that makes things unstable, rather
than THP + swap.

Kernel zswap boot params:
zswap.enabled=1 zswap.compressor=lz4 zswap.max_pool_percent=10 zswap.zpool=zbud

Then I add a 4G zram swap and run a silly memory hogger. I don't think
you'll have any problems reproducing it, but just in case I attached my
.config

	-ss