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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-raspi in Ubuntu. https://bugs.launchpad.net/bugs/1943043 Title: Multiple CPUs stuck at 100% usage Status in linux-raspi package in Ubuntu: New Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1943043/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp