Bug 1617941
| Summary: | RT system hang due to wrong of rq's nr_running [rhel-7.5.z] | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Oneata Mircea Teodor <toneata> |
| Component: | kernel-rt | Assignee: | Luis Claudio R. Goncalves <lgoncalv> |
| kernel-rt sub component: | Memory Management | QA Contact: | Jiri Kastner <jkastner> |
| Status: | CLOSED ERRATA | Docs Contact: | Marie Hornickova <mdolezel> |
| Severity: | urgent | ||
| Priority: | high | CC: | bhu, crwood, dhoward, jiang.biao2, jkastner, kernel-eus-qe, lgoncalv, mkolaja, stalexan, tian.yongjiang |
| Version: | 7.4 | Keywords: | ZStream |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | kernel-rt-3.10.0-862.13.1.rt56.816.el7 | Doc Type: | Bug Fix |
| Doc Text: |
Previously, preemption was enabled too early after a context switch. If a task was migrated to another CPU after a context switch, a mismatch between CPU and runqueue during load balancing sometimes occurred. Consequently, a runnable task on an idle CPU failed to run, and the operating system became unresponsive. This update disables preemption in the schedule_tail() function. As a result, CPU migration during post-schedule processing no longer occurs, which prevents the above mismatch. The operating system no longer hangs due to this bug.
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Story Points: | --- |
| Clone Of: | 1608672 | Environment: | |
| Last Closed: | 2018-09-25 19:10:41 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: | 1608672, 1618466 | ||
| Bug Blocks: | |||
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Description
Oneata Mircea Teodor
2018-08-16 08:25:39 UTC
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2018:2763 |