According to LKML discussion this was a regression of "zram: avoid access beyond the zram device", not "zram: use zram->lock to protect zram_free_page() in swap free notify path", reverted in Ubuntu 3.2.0-54.82: https://lkml.org/lkml/2013/8/13/270
Also the fix applied in other trees was this: https://lkml.org/lkml/2013/8/12/399 and was confirmed working in LKML.
According to LKML discussion this was a regression of "zram: avoid access beyond the zram device", not "zram: use zram->lock to protect zram_free_page() in swap free notify path", reverted in Ubuntu 3.2.0-54.82: /lkml.org/ lkml/2013/ 8/13/270
https:/
Also the fix applied in other trees was this: /lkml.org/ lkml/2013/ 8/12/399
https:/
and was confirmed working in LKML.