Comment # 8 on bug 1160604 from David Sterba

The differences, this bugreport:

submit_compressed_extents+0x50
Unable to handle kernel NULL pointer dereference at virtual address
0000000000000028

upstream:

kernel NULL pointer dereference, address: 0000000000000510
bio_associate_blkg_from_css+0x1e
btrfs_submit_compressed_write+0x137
submit_compressed_extents+0x40f

Though it's on different arches, the offsets to page should be same or close,
the crash happens in quite different functions and even if they get inlined,
the offset into the function for aarch64 is right at the beginning of
submit_compressed_extents (0x50, with inlines this would be much larger
number).