Bug 595883
| Summary: | kdmflush hung task timeout warnings | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Mike Gahagan <mgahagan> |
| Component: | kernel | Assignee: | Mikuláš Patočka <mpatocka> |
| Status: | CLOSED INSUFFICIENT_DATA | QA Contact: | Red Hat Kernel QE team <kernel-qe> |
| Severity: | medium | Docs Contact: | |
| Priority: | high | ||
| Version: | 6.0 | CC: | agk, coughlan, prajnoha |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | ppc64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2012-11-26 13:00:34 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | |||
| Bug Blocks: | 846704 | ||
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Description
Mike Gahagan
2010-05-25 20:32:18 UTC
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux major release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Major release. This request is not yet committed for inclusion. I suspect either a bug in device mapper barrier support or a bug in the underlying device driver (it can't process barrier requests). Another possibility is broken disk firmware (some disks crash their firmware if too many/too long commands are being sent to them). Questions: * What kind of device do you run the tests on? What md, dm and other layers are stacked and how? What is the physical device under this? * Are the tasks hung forever? Or do they eventually unwedge? You say that it is frequently reproducible, so try the same test using different host adapters and different disks and try to pinpoint conditions of the bug. The storage device should have been provided by IBM's virtual scsi driver, I am not 100% sure of what the underlying storage was. The install was using LVM per anaconda's/Beaker's defaults. The tasks did appear to recover eventually. I'll try and grab some differently configured ppc's this week and do some more testing. If the tasks recover, it suggests that it is not a device mapper problem (there are no timers in device mapper). I would look at the underlying device, why is it causing i/o delays. This issue has been proposed when we are only considering blocker issues in the current Red Hat Enterprise Linux release. It has been denied for the current Red Hat Enterprise Linux release. ** If you would still like this issue considered for the current release, ask your support representative to file as a blocker on your behalf. Otherwise ask that it be considered for the next Red Hat Enterprise Linux release. ** This request was evaluated by Red Hat Product Management for inclusion in the current release of Red Hat Enterprise Linux. Because the affected component is not scheduled to be updated in the current release, Red Hat is unfortunately unable to address this request at this time. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux. If you would like it considered as an exception in the current release, please ask your support representative. This request was erroneously denied for the current release of Red Hat Enterprise Linux. The error has been fixed and this request has been re-proposed for the current release. This request was evaluated by Red Hat Product Management for inclusion in the current release of Red Hat Enterprise Linux. Because the affected component is not scheduled to be updated in the current release, Red Hat is unfortunately unable to address this request at this time. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux. If you would like it considered as an exception in the current release, please ask your support representative. This request was erroneously denied for the current release of Red Hat Enterprise Linux. The error has been fixed and this request has been re-proposed for the current release. Since RHEL 6.1 External Beta has begun, and this bug remains unresolved, it has been rejected as it is not proposed as exception or blocker. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux. Since RHEL 6.2 External Beta has begun, and this bug remains unresolved, it has been rejected as it is not proposed as exception or blocker. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux. No update for over 2 years so I'm closing this one. If further data is found that points to something devel needs to investigate, then please reopen it. |