Description: ext4 data corruption due to punch hole races
References:
Notes:
 bwh> Commit a46c68a318b0 "ext4: cleanup pagecache before swap i_data" also
 bwh> depends on this.
Bugs:
upstream: released (4.5-rc1) [ea3d7209ca01da209cda6f0dea8be9cc4b7a933b, 17048e8a083fec7ad841d88ef0812707fbc7e39f, 32ebffd3bbb4162da5ff88f9a35dd32d0a28ea70, 011278485ecc3cd2a3954b5d4c73101d919bf1fa]
4.19-upstream-stable: N/A "Fixed before branch point"
4.9-upstream-stable: N/A "Fixed before branch point"
3.16-upstream-stable: pending (3.16.83) [ext4-fix-races-between-page-faults-and-hole-punching.patch, ext4-move-unlocked-dio-protection-from-ext4_alloc_file_blocks.patch, ext4-fix-races-between-buffered-io-and-collapse-insert-range.patch, ext4-fix-races-of-writeback-with-punch-hole-and-zero-range.patch]
3.2-upstream-stable: ignored "Too much work to backport"
sid: released (4.5.1-1)
4.19-buster-security: N/A "Fixed before branching point"
4.9-stretch-security: N/A "Fixed before branching point"
3.16-jessie-security: needed
3.2-wheezy-security: ignored "Too much work to backport"