After a kernel update, something should prevent to enter in hibernation because hibernation will fail at resume [1] and cause disk unclean mount [2]
[1]
[ 6.367713] PM: Marking nosave pages: 000000000009f000 - 0000000000100000
[ 6.367717] PM: Basic memory bitmaps created
[ 6.367719] PM: Preparing processes for restore.
[ 6.367721] Freezing user space processes ... (elapsed 0.01 seconds) done.
[ 6.382411] Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
[ 6.382447] PM: Reading hibernation image.
[ 6.397639] PM: Loading image data pages (113728 pages) ... <3>PM: Image mismatch: kernel release
[ 6.397647] PM: Read 454912 kbytes in 0.01 seconds (45491.20 MB/s)
[ 6.397652] PM: Error -1 resuming
[ 6.397653] PM: Restore failed, recovering.
[ 6.412996] Restarting tasks ... done.
[ 6.413053] PM: Basic memory bitmaps freed
[ 6.413055] PM: Resume from disk failed.
[2]
[ 9.515087] EXT3-fs: sda2: orphan cleanup on readonly fs
[ 9.515093] ext3_orphan_cleanup: deleting unreferenced inode 113713
[ 10.053348] ext3_orphan_cleanup: deleting unreferenced inode 50137
[ 10.070673] ext3_orphan_cleanup: deleting unreferenced inode 50210
[ 10.070688] ext3_orphan_cleanup: deleting unreferenced inode 50189
[ 10.070702] ext3_orphan_cleanup: deleting unreferenced inode 48932
[ 10.070719] ext3_orphan_cleanup: deleting unreferenced inode 48919
[ 10.070729] ext3_orphan_cleanup: deleting unreferenced inode 43221
[ 10.094448] ext3_orphan_cleanup: deleting unreferenced inode 42308
[ 10.094457] ext3_orphan_cleanup: deleting unreferenced inode 41398
[ 10.094466] ext3_orphan_cleanup: deleting unreferenced inode 49088
[ 10.094474] ext3_orphan_cleanup: deleting unreferenced inode 49086
[...]
"PM: Image mismatch: kernel release" in the log means the system used different kernel from what it had used when hibernating.
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