[SRU precise trusty utopic] LP#1432837 -- HPWDT watchdog module leads to panics

Andy Whitcroft apw at canonical.com
Tue Mar 17 14:19:36 UTC 2015

We have been seeing random crashs from various HP systems, this has
been tracked to loading of the hpwdt watchdog modules.  Basically these
modules are a loaded gun and unless you know exactly what you are doing
you are likely to take off your own head.  For this reason we already
blacklist "all" of these modules in kmod/module-in-tools blacklists.
Unfortuantly these have not been kept in sync with the kernel leading to
the module loading.

To avoid this going forward simply generate a complete list from
the kernel watchdogs/*.ko which we built.  This will be dumped into
/lib/modprobe.d/blacklist-<kabi>.conf which will effectivly leave the
installed system with the union of blacklists for all installed kernels.
Longer term we are going to engage with upstream to get something like
/lib/modules/`uname -r`/modprobe.d added to the config path so that we
can have just this versions active at any point.

Following this email are two patches, one for precise and one for
trusty/utopic.  Each is the same payload, they only differ in context.

Proposing for SRU to precise, trusty and utopic.  This has already been
applied to vivid.

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