Bug 495866
| Summary: | show_partition() oops when race with rescan_partitions() | ||||||||
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| Product: | Red Hat Enterprise Linux 5 | Reporter: | Wengang Wang <wen.gang.wang> | ||||||
| Component: | kernel | Assignee: | Jeff Moyer <jmoyer> | ||||||
| Status: | CLOSED ERRATA | QA Contact: | Red Hat Kernel QE team <kernel-qe> | ||||||
| Severity: | medium | Docs Contact: | |||||||
| Priority: | low | ||||||||
| Version: | 5.3 | CC: | dzickus, greg.marsden, lmcilroy, mgahagan | ||||||
| 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: | 2009-09-02 08:58:57 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: | |||||||||
| Attachments: |
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Description
Wengang Wang
2009-04-15 09:09:04 UTC
Created attachment 339654 [details]
show_partition() oops fix patch.
the patch fixes the oops.
it's based on kernel 2.6.18-128
please have it included in next release.
*** Bug 507758 has been marked as a duplicate of this bug. *** Created attachment 351271 [details]
Protect the per-gendisk partition array with rcu
This is basically the same patch, but protecting /proc/diskstats accesses with rcu as well.
I ran the above patch through the following test for 16 hours or so without failure: # while true; do cat /proc/diskstats > /dev/null; done & # while true; do cat /proc/partitions > /dev/null; done & # while true; do hdparm -z /dev/sdd; done Prior to the patch, I could get a failure within seconds. This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release. in kernel-2.6.18-158.el5 You can download this test kernel from http://people.redhat.com/dzickus/el5 Please do NOT transition this bugzilla state to VERIFIED until our QE team has sent specific instructions indicating when to do so. However feel free to provide a comment indicating that this fix has been verified. 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-2009-1243.html |