Bug 1400305 - RT kernel panics with dm-multipath enabled [mrg]
Summary: RT kernel panics with dm-multipath enabled [mrg]
Alias: None
Product: Red Hat Enterprise MRG
Classification: Red Hat
Component: realtime-kernel
Version: 2.5
Hardware: x86_64
OS: Linux
Target Milestone: ---
: ---
Assignee: Clark Williams
QA Contact: Lin Li
Depends On: 1389215
TreeView+ depends on / blocked
Reported: 2016-11-30 21:06 UTC by Beth Uptagrafft
Modified: 2017-01-17 18:03 UTC (History)
11 users (show)

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.
Clone Of: 1389215
Last Closed: 2017-01-17 18:03:00 UTC
Target Upstream Version:

Attachments (Terms of Use)

System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:0113 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2017-01-17 22:47:44 UTC

Comment 6 errata-xmlrpc 2017-01-17 18:03:00 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.


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