** Tags added: kernel-daily-bug -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2121149
Title: [UBUNTU 24.04] s390/pci: Fix stale function handles in error handling Status in linux package in Ubuntu: New Bug description: Description: s390/pci: Fix stale function handles in error handling Symptom: In some error scenarios automatic recovery may ultimately fail after Linux initially recovered successfully when it then tries to handle another error event. Problem: In some error scenarios multiple error events may be generated for the same PCI function before Linux even started its automatic recovery process. In this case Linux may succeed to recover based on the first event but then fails recovery when handling a subsequent event. This is because events capture the function handle as they are created. At the time when the secondary event is handled the handle stored with the error event is then stale and using it to reset the function will fail. Solution: Fix this by retrieving a fresh function handle using the CLP List PCI Functions and only process events where the stored handle matches this handle. This effectively ignores error events which were captured before the latest disable/enable cycles. Relatedly if the current handle is already disabled do not attempt to simply reset the error state as a re-enable is necessary and clearing the error state would fail. Reproduction: This may be reproduced in an artificial error scenario by issuing multiple zpcictl --reset-fw <dev> in quick succession generating multiple PEC 0x3A events with the same handle. Required Fixes / Upstream-IDs: 45537926dd2aaa9190ac0fac5a0fbeefcadfea95 b97a7972b1f4f81417840b9a2ab0c19722b577d5 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2121149/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
