| Summary: | RT kernel panics with dm-multipath enabled [mrg] | ||
|---|---|---|---|
| Product: | Red Hat Enterprise MRG | Reporter: | Beth Uptagrafft <bhu> |
| Component: | realtime-kernel | Assignee: | Clark Williams <williams> |
| Status: | CLOSED ERRATA | QA Contact: | Lin Li <lilin> |
| Severity: | high | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 2.5 | CC: | agk, bhu, bmarzins, lgoncalv, lilin, mpoledni, msnitzer, nsoffer, williams, xni, yizhan |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: |
Cause:
An upstream RT commit (fef016306919048a) was missed that made the DM system RT aware. The worker function dm_old_request_fn() was checking to ensure that irqs were disabled, but RT changes how preemption works with spinlocks so the check is invalid on RT.
Consequence:
Kernel panics on boot when dm-multipath module is loaded.
Fix:
Apply upstream RT commit fef016306919048a. This commit changes a BUG_ON macro to a BUG_ON_NONRT, which on RT becomes a noop.
Result:
No panic in when booting a kernel with dm-multipath module enabled.
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Story Points: | --- |
| Clone Of: | 1389215 | Environment: | |
| Last Closed: | 2017-01-17 18:03:00 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: | |
| Bug Depends On: | 1389215 | ||
| Bug Blocks: | |||
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Comment 6
errata-xmlrpc
2017-01-17 18:03:00 UTC
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