On 11/06/2013 10:31 PM, Richard Weinberger wrote:
> Am 06.11.2013 22:18, schrieb Toralf Förster:
>> On 11/06/2013 05:06 PM, Konstantin Khlebnikov wrote:
>>> In this case it must stop after scanning whole tree in line:
>>> /* Overflow after ~0UL */
>>> if (!index)
>>> return NULL;
>>>
>>
>> A fresh current example with latest git tree shows that lines 769 and 770 do alternate :
>
> Can you please ask gdb for the value of offset?
>
> Thanks,
> //richard
>
Still trying to get those values. One attempt to do that was to replace -O2 with -O0 in the Makefile,
but that resulted into this error :
LD kernel/built-in.o
CC mm/memory.o
In function ‘zap_pmd_range’,
inlined from ‘zap_pud_range’ at mm/memory.c:1265:8,
inlined from ‘unmap_page_range’ at mm/memory.c:1290:8:
mm/memory.c:1220:23: error: call to ‘__compiletime_assert_1220’ declared with attribute error: BUILD_BUG failed
mm/memory.c: In function ‘follow_page_mask’:
mm/memory.c:1530:18: error: call to ‘__compiletime_assert_1530’ declared with attribute error: BUILD_BUG failed
make[1]: *** [mm/memory.o] Error 1
make: *** [mm] Error 2
With -O1 it compiled at least.
>>
>> tfoerste@n22 ~/devel/linux $ sudo gdb /usr/local/bin/linux-v3.12-48-gbe408cd 16619 -n -batch -ex bt
>> 0x08296a8c in radix_tree_next_chunk (root=0x25, iter=0x462e7c64, flags=12) at lib/radix-tree.c:770
>> 770 if (node->slots[offset])
>> #0 0x08296a8c in radix_tree_next_chunk (root=0x25, iter=0x462e7c64, flags=12) at lib/radix-tree.c:770
>> #1 0x080cc1fe in find_get_pages (mapping=0x462ad470, start=0, nr_pages=14, pages=0xc) at mm/filemap.c:844
>> #2 0x080d5d6a in pagevec_lookup (pvec=0x462e7cc8, mapping=0x25, start=37, nr_pages=37) at mm/swap.c:914
>> #3 0x080d615a in truncate_inode_pages_range (mapping=0x462ad470, lstart=0, lend=-1) at mm/truncate.c:241
>> #4 0x080d64ff in truncate_inode_pages (mapping=0x25, lstart=51539607589) at mm/truncate.c:358
>>
>>
>>
>>
>> tfoerste@n22 ~/devel/linux $ sudo gdb /usr/local/bin/linux-v3.12-48-gbe408cd 16619 -n -batch -ex bt
>> radix_tree_next_chunk (root=0x28, iter=0x462e7c64, flags=18) at lib/radix-tree.c:769
>> 769 while (++offset < RADIX_TREE_MAP_SIZE) {
>> #0 radix_tree_next_chunk (root=0x28, iter=0x462e7c64, flags=18) at lib/radix-tree.c:769
>> #1 0x080cc1fe in find_get_pages (mapping=0x462ad470, start=0, nr_pages=14, pages=0x12) at mm/filemap.c:844
>> #2 0x080d5d6a in pagevec_lookup (pvec=0x462e7cc8, mapping=0x28, start=40, nr_pages=40) at mm/swap.c:914
>> #3 0x080d615a in truncate_inode_pages_range (mapping=0x462ad470, lstart=0, lend=-1) at mm/truncate.c:241
>> #4 0x080d64ff in truncate_inode_pages (mapping=0x28, lstart=77309411368) at mm/truncate.c:358
>> #5 0x0825e388 in hostfs_evict_inode (inode=0x462ad3b8) at fs/hostfs/hostfs_kern.c:242
>> #6 0x0811a8df in evict (inode=0x462ad3b8) at fs/inode.c:549
>>
>>
>
>
--
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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