Bug 465825
Summary: | panic in kcopyd during snapshot I/O | ||||||
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Product: | Red Hat Enterprise Linux 5 | Reporter: | Corey Marthaler <cmarthal> | ||||
Component: | kernel | Assignee: | Mikuláš Patočka <mpatocka> | ||||
Status: | CLOSED ERRATA | QA Contact: | Martin Jenner <mjenner> | ||||
Severity: | medium | Docs Contact: | |||||
Priority: | medium | ||||||
Version: | 5.3 | CC: | agk, benl, dwysocha, dzickus, edamato, heinzm, jbrassow, mbroz, prockai, syeghiay, zhlqcn | ||||
Target Milestone: | rc | ||||||
Target Release: | --- | ||||||
Hardware: | All | ||||||
OS: | Linux | ||||||
Whiteboard: | |||||||
Fixed In Version: | Doc Type: | Bug Fix | |||||
Doc Text: | Story Points: | --- | |||||
Clone Of: | Environment: | ||||||
Last Closed: | 2009-01-20 20:17:28 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: | 476461 | ||||||
Attachments: |
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Description
Corey Marthaler
2008-10-06 15:48:19 UTC
Created attachment 320331 [details]
A patch that could fix this
A patch that fixes memory corruption in snapshots. It may fix this but, although it is not possible to verify it because the bug is not reproducible.
When reading the source code, I found a possible race condition that could result in this crash. It is not possible to verify it because this crash is unreproducible. The patch and explanation of the race is in the above attachment. The bug is much more serious than it looks --- it may result in random crashing if the user is writing simultaneously to both origin volume and snapshot volume. The crashing may happen even under normal operation, without any disk errors. (crashing under normal non-error conditions is reported to happen in the link in kernel.org bugzilla above, we are waiting for feedback). Because this is random crashing condition, I am suggesting to mark it as an exception and get the fix into 5.3. This bug was present since snapshots were introduced, it is in both RHEL-4 and RHEL-5. exception raised, removing needinfo. in kernel-2.6.18-121.el5 You can download this test kernel from http://people.redhat.com/dzickus/el5 *** Bug 472094 has been marked as a duplicate of this bug. *** Fix verified in 2.6.18-123.el5. An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2009-0225.html |