Public bug reported:
System boots fine, but after several hours, a random process will consume 100%
CPU (all kernel time), if the pi is left on longer, this will happen to more
cpus.
At the same time the interrupt count for "fe00b880.mailbox" drops dramatically.
Kernel stacktrace seems to point to an exception happening in scheduling:
[<0>] __switch_to+0xb8/0xe4
[<0>] function_trace+0x98/0x98
[<0>] do_translation_fault+0x64/0x9c
[<0>] do_mem_abort+0x4c/0xbc
[<0>] el1_abort+0x74/0xf4
[<0>] el1_sync_handler+0xac/0xcc
[<0>] el1_sync+0x7c/0x100
[<0>] schedule_tail+0x130/0x200
[<0>] ret_from_fork+0x4/0x3c
System is booting from NFS over the build in ethernet - so its going to
have a lot of NIC traffic.
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: linux-image-5.11.0-1016-raspi 5.11.0-1016.17
ProcVersionSignature: Ubuntu 5.11.0-1016.17-raspi 5.11.22
Uname: Linux 5.11.0-1016-raspi aarch64
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: arm64
CasperMD5CheckResult: unknown
Date: Wed Sep 8 13:30:28 2021
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
LANG=C.UTF-8
SHELL=/bin/bash
RebootRequiredPkgs:
linux-image-5.11.0-1017-raspi
linux-base
SourcePackage: linux-raspi
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.default.apport:
# set this to 0 to disable apport, or to 1 to enable it
# you can temporarily override this with
# sudo service apport start force_start=1
enabled=0
mtime.conffile..etc.default.apport: 2021-07-15T11:07:35.169244
** Affects: linux-raspi (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug arm64 hirsute uec-images
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https://bugs.launchpad.net/bugs/1943043
Title:
Multiple CPUs stuck at 100% usage
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