[Debian-ha-maintainers] dlm: dev_write no op

[Jonathan Nieder]

reassign 691749 src:redhat-cluster
tags 691749 + upstream patch
forwarded 691749 https://bugzilla.redhat.com/731775
affects 691749 + src:linux
quit

Hi Etienne,

Etienne Bagnoud wrote:

> The bug described there https://lists.launchpad.net/ubuntu-ha/msg01558.html is also
> present in current Debian Wheezy kernel (I think it's a kernel bug).
> The problem arise when running CTDB over OCFS2 filesystem with DRBD, log are
> spammed with "dlm: dev_write no op ...".
[...]
> ** Kernel log:
> [61147.256772] dlm: dev_write no op a496cdc8 f4202
> [61148.254552] dlm: dev_write no op a496cdc8 f4202
> [61149.252208] dlm: dev_write no op a496cdc8 f4202

Sounds like <https://bugzilla.redhat.com/731775>, which had the
following summary:

| Cause: the patch for bug 678585 was incomplete.  dlm_controld was
| still passing error results back to the kernel for posix unlock
| operations flagged with CLOSE.
|
| Consequence: the kernel complains if it receives a posix lock result
| that it is not expecting: "dev_write no op ...".  Many of these can
| appear, especially when using flocks (not posix locks).
|
| Fix: dlm_controld is fixed to not pass error results to the kernel
| for posix unlock operations flagged with CLOSE.
|
| Result: No "dev_write no op" messages should appear.

The fix seems to be present in redhat-cluster/unstable and not in
squeeze or wheezy.  Can you confirm?

Thanks and hope that helps,
Jonathan