Bug 689699
| Summary: | Deadlock between device driver attachment and device removal with a USB device [rhel-5.6.z] | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | RHEL Program Management <pm-rhel> |
| Component: | kernel | Assignee: | Phillip Lougher <plougher> |
| Status: | CLOSED ERRATA | QA Contact: | Red Hat Kernel QE team <kernel-qe> |
| Severity: | urgent | Docs Contact: | |
| Priority: | urgent | ||
| Version: | 5.5 | CC: | apevec, bruno.cornec, dhoward, djeffery, dyasny, dzickus, jpirko, jwilson, pm-eus, qcai, yugzhang |
| Target Milestone: | rc | Keywords: | ZStream |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | kernel-2.6.18-238.10.1.el5 | Doc Type: | Bug Fix |
| Doc Text: |
Under certain circumstances, a deadlock could occur between the khubd process of the USB stack and the modprobe of the usb-storage module. This was because the khubd process, when attempting to delete a usb device, waited for the reference count of knode_bus to be of value 0. However, modprobe, when loading the usb-storage module, scans all USB devices and increments the reference count, preventing the khubd process to continue. With this update, the underlying source code has been modified to address this issue, and a deadlock no longer occurs in the aforementioned case.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-05-31 14:07:14 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: | 637930 | ||
| Bug Blocks: | 568128 | ||
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Description
RHEL Program Management
2011-03-22 08:02:53 UTC
in kernel-2.6.18-238.10.1.el5 linux-2.6-misc-pm-add-comment-explaining-is_registered-kabi-work-around.patch linux-2.6-base-fix-potential-deadlock-in-driver-core.patch 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-2011-0833.html
Technical note added. If any revisions are required, please edit the "Technical Notes" field
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New Contents:
Under certain circumstances, a deadlock could occur between the khubd process of the USB stack and the modprobe of the usb-storage module. This was because the khubd process, when attempting to delete a usb device, waited for the reference count of knode_bus to be of value 0. However, modprobe, when loading the usb-storage module, scans all USB devices and increments the reference count, preventing the khubd process to continue. With this update, the underlying source code has been modified to address this issue, and a deadlock no longer occurs in the aforementioned case.
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