Messages in this thread | | | Subject | Re: 2.6.15-rc4 panic in __nr_to_section() with CONFIG_SPARSEMEM | From | Badari Pulavarty <> | Date | Wed, 07 Dec 2005 15:22:52 -0800 |
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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.
db2inst1@elm3b157:~> cat /proc/12030/maps ... 100000000-101598000 rw-s 00000000 00:07 589826 /SYSV2a079461 (deleted) ...
db2inst1@elm3b157:~> cat /proc/12030/smaps ... 100000000-101598000 rw-s 00000000 00:07 5Segmentation fault
Thanks, Badari
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