Hi, Between 4.11 and 4.12 I stopped being able to boot my system with root partition encrypted with dm-crypt (issue still present in 4.14-rc7). The system was able to open the dm-crypt device and read-only mount the XFS root partition on it. Later read-write remounting though caused XFS to shutdown the filesystem on IO error. Some reports found online indicated a possible coincidence with stack protection or the like as well as use of slub_debug, the latter causing the IO errors to surface for me (I have slub_debug=ZP on my kernel cmdline). I finally got time to go and bisect in order to find the triggering patch. Bisect log: # good: [a351e9b9fc24e982ec2f0e76379a49826036da12] Linux 4.11 git bisect good a351e9b9fc24e982ec2f0e76379a49826036da12 # bad: [6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c] Linux 4.12 git bisect bad 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c # bad: [2bd80401743568ced7d303b008ae5298ce77e695] Merge tag 'gpio-v4.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio git bisect bad 2bd80401743568ced7d303b008ae5298ce77e695 # good: [8d65b08debc7e62b2c6032d7fe7389d895b92cbc] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next git bisect good 8d65b08debc7e62b2c6032d7fe7389d895b92cbc # good: [8b03d1ed2c43a2ba5ef3381322ee4515b97381bf] Merge branch 'linux-4.12' of git://github.com/skeggsb/linux into drm-next git bisect good 8b03d1ed2c43a2ba5ef3381322ee4515b97381bf # bad: [e897f267c51812bfecec45771a2d835c1a2bdacf] Merge tag 'backlight-next-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight git bisect bad e897f267c51812bfecec45771a2d835c1a2bdacf # good: [46f0537b1ecf672052007c97f102a7e6bf0791e4] Merge branch 'stable-4.12' of git://git.infradead.org/users/pcmoore/audit git bisect good 46f0537b1ecf672052007c97f102a7e6bf0791e4 # good: [20d5c84bef067b7e804a163e2abca16c47125bad] Merge remote-tracking branches 'asoc/topic/wm8960', 'asoc/topic/wm8978' and 'asoc/topic/zte-tdm' into asoc-next git bisect good 20d5c84bef067b7e804a163e2abca16c47125bad # bad: [7b66f13207e60e7c550af730986e77e38a0c69a3] Merge tag 'for-4.12/dm-post-merge-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm git bisect bad 7b66f13207e60e7c550af730986e77e38a0c69a3 # good: [dd7a8f5dee81ffb1794df1103f07c63fd4f1d766] md/raid5: make chunk_aligned_read() split bios more cleanly. git bisect good dd7a8f5dee81ffb1794df1103f07c63fd4f1d766 # bad: [6625d903253eb6f003849823e22d7b8de5bfb5b2] dm integrity: use hex2bin instead of open-coded variant git bisect bad 6625d903253eb6f003849823e22d7b8de5bfb5b2 # bad: [449b668ce0b9069fcaafa6344c7f10fa2ba9632e] dm cache: set/clear the cache core's dirty_bitset when loading mappings git bisect bad 449b668ce0b9069fcaafa6344c7f10fa2ba9632e # good: [33d2f09fcb357fd1861c4959d1d3505492bf91f8] dm crypt: introduce new format of cipher with "capi:" prefix git bisect good 33d2f09fcb357fd1861c4959d1d3505492bf91f8 # bad: [ff3af92b4461be773337111daea80bb91b2cd545] dm crypt: use shifts instead of sector_div git bisect bad ff3af92b4461be773337111daea80bb91b2cd545 # bad: [1aa0efd4210df1c57764b77040a6615bc9b3ac0f] dm integrity: factor out create_journal() from dm_integrity_ctr() git bisect bad 1aa0efd4210df1c57764b77040a6615bc9b3ac0f # bad: [8f0009a225171cc1b76a6b443de5137b26e1374b] dm crypt: optionally support larger encryption sector size git bisect bad 8f0009a225171cc1b76a6b443de5137b26e1374b # first bad commit: [8f0009a225171cc1b76a6b443de5137b26e1374b] dm crypt: optionally support larger encryption sector size In order to test on 4.12 I had to revert the following commits, the first two having been applied on top of bad commit: 583fe7474c05ee5523e14ef791ea59604cd846dc (dm crypt: fix large block integrity support) ff3af92b4461be773337111daea80bb91b2cd545 (dm crypt: use shifts instead of sector_div) 8f0009a225171cc1b76a6b443de5137b26e1374b (dm crypt: optionally support larger encryption sector size) >From looking at 8f0009a225171cc1b76a6b443de5137b26e1374b I can't spot direct cause though I assume there might be a mismatch in memory allocation versus access sizes as a consequence of support for larger encryption sector size (someplace 512 byte versus page size access tripping on memory poison?). Bruno -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
