On Wednesday 11 June 2008 12:08:53 pm Jiri Slaby wrote:On 06/10/2008 07:31 AM, Andrew Morton wrote:ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.26-rc5/2.6.26-rc5-mm2/I face problems after some of the pnp changes. If this is not known, I may bisect it, it's 100% reproducible. I have no real logs, It panics prior to network is woken up to see something on netconsole, I just captured a function name and an offset of place where it oopses.
pnpacpi_encode_resources, ACPI_RESOURCE_TYPE_DMA case, pnp_get_resource(dev, IORESOURCE_DMA, dma) returns NULL, which is dereferenced at pnpacpi_encode_dma at p->flags.
It happens on resume after mem > /sys/power/state.
Thanks for the report, I hadn't heard about this.
We used to always have a resource from the static table to encode
(assuming the table was big enough), even if that resource was
disabled or unassigned. But now we don't keep those around, so
we can end up with null pointers like you're seeing.
Before you go to all the trouble of bisecting it, can you turn on
CONFIG_PNP_DEBUG and try the following debug patch? I think this
will prevent the oops, but it's just papering over the real problem,
so please capture the complete dmesg log.