Messages in this thread | | | Date | Wed, 12 Dec 2001 13:57:13 +1100 | From | Matt <> | Subject | Re: PROBLEM: Kernel Oops on cat /proc/ioports |
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On Tue, Dec 11, 2001 at 05:06:57PM -0800, Andrew Morton wrote: > Berend De Schouwer wrote:
>> [1.] One line summary of the problem:
>> Running "cat /proc/ioports" causes a segfault and kernel oops.
>> ... >> [7.3.] Module information (from /proc/modules):
>> cyclades 147616 16 (autoclean)
> cyclades does request_region(), but forgets to do release_region(). > This will leave the region allocated in kernel data structures, but > its "name" field resides in module memory.
> So if you load cyclades.o, then rmmod it, then cat /proc/ioports, > you'll touch unmapped memory and go boom.
> Some brave soul needs to teach cyclades about release_region(). > Shame the Nobel prizes are all gone this year.
speaking of living in module memory, a similar thing happens with the via-rhine driver. after my machine has been up for a few hours the "via-rhine" string in /proc/iomem and /proc/ioports gets over written and prints garbage. since this has never been the cause for an oops on my machine i never bothered reporting it. if anyone wants details i'll provide.
matt
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