Messages in this thread | | | Subject | Re: 2.6.15-rc4 panic in __nr_to_section() with CONFIG_SPARSEMEM | From | Dave Hansen <> | Date | Wed, 07 Dec 2005 15:34:15 -0800 |
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On Wed, 2005-12-07 at 15:22 -0800, Badari Pulavarty wrote: > On Wed, 2005-12-07 at 23:05 +0000, Andy Whitcroft wrote: > > Badari Pulavarty wrote: > > > Hi Andy, > > > > > > I getting a panic while doing "cat /proc/<pid>/smaps" on > > > a process. I debugged a little to find out that faulting > > > IP is in _nr_to_section() - seems to be getting somehow > > > called by pte_offset_map_lock() from smaps_pte_range > > > (which show_smaps) calls. > > > > > > Any ideas on why or how to debug further ? > > > > From dave's call graph I'd ask the question whether we should be calling > > pfn_valid() before pfn_to_page(). When I reviewed the proposed > > pfn_to_page() implementation I only recall one use and that already had > > the pfn_valid() in it. I'll review -rc4 in the morning. > > BTW, the problem seems to be while dealing with shared memory areas > that are backed by largepages.
Should you even be making it into the pte function with large pages? Don't they just stop at the pmd level?
Maybe smaps_pmd_range() needs a pmd_huge() check.
-- Dave
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