/proc/<pid>/stat doesn't update after resume from hibernation

[Darin]

After hibernating (to disk) and resuming, the utime/stime info in /proc/<pid>/stat files for every process (started from before the system hibernated as well as newly started ones) will not update. That would last a certain amount of time. Sometimes as little as 5m and sometimes hours. It seems to be dependant on the amount of time the system stayed hibernated. It eventually resumes and utime/stime continue increasing from their previous values. This happens with 5.10, 5.19, 6.1, 6.2. Pretty much every kernel that I tested. I also tested with a fresh debian bullseye install - it has the same problem.

ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: linux-image-6.2.0-1005-gcp 6.2.0-1005.5
ProcVersionSignature: Ubuntu 6.2.0-1005.5-gcp 6.2.6
Uname: Linux 6.2.0-1005-gcp x86_64
ApportVersion: 2.26.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CloudArchitecture: x86_64
CloudBuildName: server
CloudID: gce
CloudName: gce
CloudPlatform: gce
CloudRegion: us-west4
CloudSerial: 20190404
CloudSubPlatform: metadata (http://metadata.google.internal/computeMetadata/v1/)
Date: Fri May 19 15:48:01 2023
ProcEnviron:
 LANG=C.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: linux-signed-gcp
UpgradeStatus: Upgraded to lunar on 2023-04-26 (22 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mark Waterhouse (mark-dfk)]

Same behaviour across CentOS 7.9.2009 on AWS