Public bug reported:
[Impact]
Error records which have multiple errors in them will incorrectly report all
errors after the first one. This results in garbage non-standard error trace
events to be generated, and for AER and MC errors there will be no kernel
action to help recover from these errors in the AER and EDAC drivers.
[Fix]
Patches in Linus tree fixes this issue:
aaf2c2fb0f51 ACPI / APEI: clear error status before acknowledging the error
c4335fdd3822 ACPI: APEI: fix the wrong iteration of generic error status block
[Testing]
Insert a e1000 pcie card into the system, run the following command that should
generate PCIe correctable errors, you will see only the first error in each
GHES report go to the AER driver rather than all errors from the GHES reports.
$ sudo setpci -s 0002:00:00.0 0x70c.l=0x00808000;sudo setpci -s
0002:00:00.0 CAP_EXP+0x10.B=0x4b;sleep 1;sudo setpci -s 0002:00:00.0
CAP_EXP+0x10.B=0x48
Where "0002:00:00.0" being the root hub for the card.
[Regression Potential]
The two patches to ACPI APEI driver was cleanly cherry picked from linus's tree
and applied to Artful and Zesty. The patches were tested on QDF2400 platform
where it was found to issue and don't introduce any regressions.
** Affects: linux (Ubuntu)
Importance: Critical
Assignee: Manoj Iyer (manjo)
Status: New
** Tags: qdf2400
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https://bugs.launchpad.net/bugs/1732990
Title:
[Artful/Zesty] ACPI APEI error handling bug fixes
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