| Summary: | dbus timeout | ||||||
|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Jaroslav Škarvada <jskarvad> | ||||
| Component: | tuned | Assignee: | Jaroslav Škarvada <jskarvad> | ||||
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Branislav Blaškovič <bblaskov> | ||||
| Severity: | unspecified | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | 7.0 | CC: | bblaskov, jeder, jscotka, jskarvad, perfbz | ||||
| Target Milestone: | rc | Keywords: | Patch | ||||
| Target Release: | --- | ||||||
| Hardware: | Unspecified | ||||||
| OS: | Unspecified | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | tuned-2.3.0-2.el7 | Doc Type: | Bug Fix | ||||
| Doc Text: |
Cause:
There was an hidden race condition in the Tuned code since the beginning of the Tuned v2 development.
Consequence:
If the switch profile command was sent to the Tuned daemon quickly more times (e.g. twice) and the previous switch profile command wasn't yet finished, the race condition may occur and the deadlock may trigger. In the deadlocked state the Tuned daemon stopped responding to further commands and had to be killed by the operator.
Fix:
The Tuned code was modified for the deadlock not to occur any more.
Result:
Multiple quick requests can be processed now and the Tuned daemon still responds.
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Story Points: | --- | ||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2014-06-13 11:00:37 UTC | Type: | Bug | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Attachments: |
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The source of this problem is currently unclear to me. I am working on it I got it, there is race condition in the start/stop code. The race is there since the beginning of the tuned-2 development. Simple reproducer: tuned-adm profile balanced && tuned-adm profile balanced Created attachment 821328 [details]
Proposed fix
I cannot reproduce this with tuned-2.3.0-3.el7.noarch either. Marking as VERIFIED. This request was resolved in Red Hat Enterprise Linux 7.0. Contact your manager or support representative in case you have further questions about the request. |
Description of problem: tuned-adm can timeout and tuned dies. Version-Release number of selected component (if applicable): tuned-2.3.0 How reproducible: Sometimes Steps to Reproduce: 1. Run the reproducer Actual results: dbus timeout Expected results: No timeout Additional info: Older tuned seems also affected. Reproducer: PROFILES=(balanced latency-performance powersave throughput-performance virtual-guest virtual-host) for (( i=0; i < 100; i++ )) do p=${PROFILES[$(( RANDOM % ${#PROFILES[@]} ))]} echo "iter: $i, profile: $p" tuned-adm profile $p done