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Subjecthtree directory indexing 2.4.18-2 BUG with highmem and also high i/o
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Hi Daniel,

I've found a bug with htree directory indexing patch and
highmem enabled (64GB). This is with 2.4.18 and htree patch
2.4.18-2. Oops appears if accessing an ext2 partition with ls
or doing "who/w" in the directory of the ext2 partition.

Without the patch all works fine.


ksymoops 2.4.5 on i686 2.4.18. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.18/ (default)
-m /boot/System.map-2.4.18 (default)

Warning: You did not tell me where to find symbol information. I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc. ksymoops -h explains the options.

Jul 9 22:47:56 ml570 kernel: Unable to handle kernel NULL pointer dereference
at virtual address 00000006
Jul 9 22:47:56 ml570 kernel: c019e190
Jul 9 22:47:56 ml570 kernel: *pde = 2a535001
Jul 9 22:47:56 ml570 kernel: Oops: 0000
Jul 9 22:47:56 ml570 kernel: CPU: 1
Jul 9 22:47:56 ml570 kernel: EIP: 0010:[ext2_find_entry+564/836] Not
tainted
Jul 9 22:47:56 ml570 kernel: EFLAGS: 00010293
Jul 9 22:47:56 ml570 kernel: eax: 00000400 ebx: 00000000 ecx: d3129900
edx: 000003f8
Jul 9 22:47:56 ml570 kernel: esi: 00000000 edi: ea080900 ebp: d3133ea4
esp: d3133e5c
Jul 9 22:47:56 ml570 kernel: ds: 0018 es: 0018 ss: 0018
Jul 9 22:47:56 ml570 kernel: Process w (pid: 371, stackpage=d3133000)
Jul 9 22:47:56 ml570 kernel: Stack: ea080900 00000000 ea080900 d3129900
c0139535 d3132000 00000000 00000400
Jul 9 22:47:56 ml570 kernel: 0000000a 00000003 ea080960 00000400
d31cc500 c01336da e0656b80 001c8000
Jul 9 22:47:56 ml570 kernel: 00000000 00000246 e925e100 c019e2eb
e925e100 ea080900 d3133ec0 ea080900
Jul 9 22:47:56 ml570 kernel: Call Trace: [filemap_nopage+241/524]
[do_no_page+182/940] [ext2_inode_by_name+27/128]
Warning (Oops_read): Code line not seen, dumping what data is available

>>ecx; d3129900 <[iptable_nat].bss.end+1a4a6d/8ba16d>
>>edi; ea080900 <END_OF_CODE+1648fb41/????>
>>ebp; d3133ea4 <[iptable_nat].bss.end+1af011/8ba16d>
>>esp; d3133e5c <[iptable_nat].bss.end+1aefc9/8ba16d>

Jul 9 22:47:56 ml570 kernel: Code: 0f b6 43 06 39 45 dc 75 1a 83 3b 00 74 15
8b 75 e0 8b 4d dc
Using defaults from ksymoops -t elf32-i386 -a i386


Code; 00000000 Before first symbol
00000000 <_EIP>:
Code; 00000000 Before first symbol
0: 0f b6 43 06 movzbl 0x6(%ebx),%eax
Code; 00000004 Before first symbol
4: 39 45 dc cmp %eax,0xffffffdc(%ebp)
Code; 00000007 Before first symbol
7: 75 1a jne 23 <_EIP+0x23> 00000023 Before first
symbol
Code; 00000009 Before first symbol
9: 83 3b 00 cmpl $0x0,(%ebx)
Code; 0000000c Before first symbol
c: 74 15 je 23 <_EIP+0x23> 00000023 Before first
symbol
Code; 0000000e Before first symbol
e: 8b 75 e0 mov 0xffffffe0(%ebp),%esi
Code; 00000011 Before first symbol
11: 8b 4d dc mov 0xffffffdc(%ebp),%ecx

--
Kind regards,
Marc-Christian Petersen

http://sourceforge.net/projects/wolk

PGP/GnuPG Key: 1024D/408B2D54947750EC
Fingerprint: 8602 69E0 A9C2 A509 8661 2B0B 408B 2D54 9477 50EC
Key available at www.keyserver.net. Encrypted e-mail preferred.


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