IO memory read from /proc/vmcore leads to hang.

Daniel Walker danielwa at
Mon Jul 11 14:46:01 PDT 2016


I found found that on my Powerpc machine there is some IO memory which 
will cause the box to hang if I read it. It's a custom device that was 
added to the board for a special purpose.

I was looking for a way to exclude this memory from the dump, and while 
doing that I found that kexec makes a list of memory segments that go 
into the core file. I was wondering why most of the kexec architecture 
don't appear to exclude device memory like what's listed in /proc/iomem.

Is there a good reason why that's not the case?


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