Bug 237126 - invalid ids for user locks
invalid ids for user locks
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel (Show other bugs)
All Linux
medium Severity medium
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Assigned To: David Teigland
Cluster QE
Depends On:
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Reported: 2007-04-19 12:14 EDT by David Teigland
Modified: 2007-11-30 17:07 EST (History)
0 users

See Also:
Fixed In Version: RHBA-2007-0959
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2007-11-07 14:47:19 EST
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
patch posted to rhkernel on 04/19 (2.00 KB, text/plain)
2007-04-19 13:36 EDT, David Teigland
no flags Details

  None (edit)
Description David Teigland 2007-04-19 12:14:33 EDT
Description of problem:

A lock id is a uint32 and is used as an opaque reference to the lock.  For
userland apps, the lkid is passed up, through libdlm, as the return value
from a write() on the dlm device.  This created a problem when the high
bit was 1, making the lkid look like an error.  This is fixed by changing
how the lkid is composed.  The low 16 bits identified the hash bucket for
the lock and the high 16 bits were a per-bucket counter (which eventually
hit 0x8000 causing the problem).  These are simply swapped around; the
number of hash table buckets is far below 0x8000, making all lkid's
positive when viewed as signed.

Version-Release number of selected component (if applicable):

How reproducible:

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Additional info:
Comment 1 RHEL Product and Program Management 2007-04-19 13:13:13 EDT
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
Comment 2 David Teigland 2007-04-19 13:36:50 EDT
Created attachment 153037 [details]
patch posted to rhkernel on 04/19
Comment 3 Don Zickus 2007-05-01 14:04:16 EDT
in 2.6.18-17.el5
Comment 6 errata-xmlrpc 2007-11-07 14:47:19 EST
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 the 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.


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