reproduce:
        # https://github.com/davidhildenbrand/linux/commit/6b6d701fc4ccebcd7bdadc24dfb045e4f7f0940c
        git remote add davidhildenbrand https://github.com/davidhildenbrand/linux
        git fetch --no-tags davidhildenbrand page_mapcount_reset
        git checkout 6b6d701fc4ccebcd7bdadc24dfb045e4f7f0940c
        # choose either of the following two methods to reproduce the issue
        # 1. reproduce by kismet
           # install kmax per https://github.com/paulgazz/kmax/blob/master/README.md
           kismet --linux-ksrc=linux --selectees CONFIG_ZSMALLOC --selectors CONFIG_ZSWAP_ZPOOL_DEFAULT_ZSMALLOC -a=hexagon
        # 2. reproduce by make
           cd linux
           # download the config file from the "config:" link in the report, and save it as .config
           make ARCH=hexagon olddefconfig