The do_wp_page() takes the ptl_lock and then calls vfs_check_frozen() which may go to sleep if the bdev in question is frozen. Introduced by linux-2.6-fs-generic-freeze-ioctl-interface.patch in 2.6.18-164.2.1 kernel.
Created attachment 374278 [details] Proposed fix The correct solution is to move the call to vfs_check_frozen from out of this lock all the more so two lines below we have proper unlock-lock-check_pte steps.
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 release.
Is there anyone able to reproduce this?
(In reply to comment #7) > Is there anyone able to reproduce this? If there is a test kernel with this fix, I can try to get the reporter to test it for us (only if he is able to help us).
(In reply to comment #7) > Is there anyone able to reproduce this? I'm able to do it and I actually did it when reported the problem. (In reply to comment #8) > If there is a test kernel with this fix, I can try to get the reporter to test > it for us (only if he is able to help us). I built the kernel with the attached patch and checked that it helped.
in kernel-2.6.18-178.el5 You can download this test kernel from http://people.redhat.com/dzickus/el5 Please update the appropriate value in the Verified field (cf_verified) to indicate this fix has been successfully verified. Include a comment with verification details.
*** Bug 539328 has been marked as a duplicate of this bug. ***
There's quite a few people reporting this problem (or what is alleged to be this problem) on the CentOS bug tracker under bug #3869. http://bugs.centos.org/view.php?id=3869
~~ Attention Customers and Partners - RHEL 5.5 Beta is now available on RHN ~~ RHEL 5.5 Beta has been released! There should be a fix present in this release that addresses your request. Please test and report back results here, by March 3rd 2010 (2010-03-03) or sooner. Upon successful verification of this request, post your results and update the Verified field in Bugzilla with the appropriate value. If you encounter any issues while testing, please describe them and set this bug into NEED_INFO. If you encounter new defects or have additional patch(es) to request for inclusion, please clone this bug per each request and escalate through your support representative.
I checked the kernel. All works OK. Thanks.
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 therefore 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. http://rhn.redhat.com/errata/RHSA-2010-0178.html