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Subjectzram NULL pointer dereference (zs_malloc)
Date
I found a serious bug about kernel NULL pointer dereference when using 
zram (in my case zram+btrfs) that makes system unstable and usually ends
in a forced unclean reboot like powering off power source.

This issue is present since >5.8.0 version (this one seems not affected)
and still present in 5.9.0 and reported in
https://bugzilla.kernel.org/show_bug.cgi?id=209153

Since this issue seems major enough, can someone please review this issue?


Thanks.

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