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Subject[VMBUG] 2.4.15-pre7 Severe VM Bugs in 2.4.15-pre7


The attached oops results from using NWFS on 2.4.15-pre7 with the
3Ware adapter. I do not know what is happening here, but looks
like some sort of severe memory corruption. In any event,
a very nasty looking bug.

I am looking through my code to see if I caused this, however, the
oops indicates my code does not seem to be involved in this oops. I
have noticed of late some severe stability issues with VM in 2.4.X
and I noticed Linus addressing some problems with the compiler
generating garbage instructions. I do not know if this is related.

Please advise, and let me know if anyone wants me to run down further
info. I do exercise the memory and IO subsystem a little more strenuously
than the buffer cache and perhaps I am stressing the VM in a different
way. Could also just simply be a bug I am causing.


Jeff

ksymoops 2.4.0 on i686 2.4.15-pre7. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.15-pre7/ (default)
-m /boot/System.map-2.4.15-pre7 (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.

No modules in ksyms, skipping objects
Warning (read_lsmod): no symbols in lsmod, is /proc/modules a valid lsmod file?
Error (regular_file): read_system_map stat /boot/System.map-2.4.15-pre7 failed
Nov 20 09:58:50 scimitar kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000008
Nov 20 09:58:50 scimitar kernel: c0172f1b
Nov 20 09:58:50 scimitar kernel: *pde = 00000000
Nov 20 09:58:50 scimitar kernel: Oops: 0000
Nov 20 09:58:50 scimitar kernel: CPU: 1
Nov 20 09:58:50 scimitar kernel: EIP: 0010:[<c0172f1b>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
Nov 20 09:58:50 scimitar kernel: EFLAGS: 00010246
Nov 20 09:58:50 scimitar kernel: eax: 00000000 ebx: cea30000 ecx: cea30018 edx: 000002b8
Nov 20 09:58:50 scimitar kernel: esi: 00000000 edi: 00000000 ebp: 0000002f esp: cead5ab8
Nov 20 09:58:50 scimitar kernel: ds: 0018 es: 0018 ss: 0018
Nov 20 09:58:50 scimitar kernel: Process mount (pid: 720, stackpage=cead5000)
Nov 20 09:58:50 scimitar kernel: Stack: cea30018 c0173e29 cea30018 00000080 00000009 cea30018 00000003 00000004
Nov 20 09:58:50 scimitar kernel: 000000ae 09c23fff 00000000 c1556600 00000000 00000000 00000009 c019b9bb
Nov 20 09:58:50 scimitar kernel: cead5b28 00001000 cead5b5c 00001000 c030f4fc 00000009 c0172e39 c0172e7f
Nov 20 09:58:50 scimitar kernel: Call Trace: [<c0173e29>] [<c019b9bb>] [<c0172e39>] [<c0172e7f>] [<c019a64a>]
Nov 20 09:58:50 scimitar kernel: [<c0124382>] [<c014463c>] [<c013c560>] [<c0295e70>] [<c01124ba>] [<c0176127>]
Nov 20 09:58:50 scimitar kernel: [<c0124d91>] [<c0124da2>] [<c0112320>] [<c010700c>] [<c0124804>] [<c0112320>]
Nov 20 09:58:50 scimitar kernel: [<c010700c>] [<c02949fb>] [<c014bf8c>] [<c014cf8f>] [<c013c560>] [<c012d9e1>]
Nov 20 09:58:50 scimitar kernel: [<c01241ba>] [<c0124214>] [<c0124382>] [<c012779c>] [<c01277c9>] [<c01124ba>]
Nov 20 09:58:50 scimitar kernel: [<c0128742>] [<c0183a39>] [<c01277c9>] [<c0154922>] [<c01125f0>] [<c0294922>]
Nov 20 09:58:50 scimitar kernel: [<c0137fe1>] [<c0138460>] [<c013894f>] [<c0148f53>] [<c0112320>] [<c010700c>]
Nov 20 09:58:50 scimitar kernel: [<c01491ec>] [<c014905c>] [<c01492b0>] [<c0106f1b>]
Nov 20 09:58:50 scimitar kernel: Code: 8b 50 08 2b 51 f0 89 50 08 8b 41 f4 ff 48 04 8b 41 f8 83 f8

>>EIP; c0172f1b <nlmsvc_invalidate_client+1ffb/32410> <=====
Trace; c0173e29 <nlmsvc_invalidate_client+2f09/32410>
Trace; c019b9bb <nlmsvc_invalidate_client+2aa9b/32410>
Trace; c0172e39 <nlmsvc_invalidate_client+1f19/32410>
Trace; c0172e7f <nlmsvc_invalidate_client+1f5f/32410>
Trace; c019a64a <nlmsvc_invalidate_client+2972a/32410>
Trace; c0124382 <vmtruncate+542/b30>
Trace; c014463c <dput+1c/150>
Trace; c013c560 <path_release+40/180>
Trace; c0295e70 <memparse+150/440>
Trace; c01124ba <__verify_write+3ba/8c0>
Trace; c0176127 <nlmsvc_invalidate_client+5207/32410>
Trace; c0124d91 <do_mmap_pgoff+421/4f0>
Trace; c0124da2 <do_mmap_pgoff+432/4f0>
Trace; c0112320 <__verify_write+220/8c0>
Trace; c010700c <__read_lock_failed+1290/2704>
Trace; c0124804 <vmtruncate+9c4/b30>
Trace; c0112320 <__verify_write+220/8c0>
Trace; c010700c <__read_lock_failed+1290/2704>
Trace; c02949fb <clear_user+2b/40>
Trace; c014bf8c <may_umount+37cc/77f0>
Trace; c014cf8f <may_umount+47cf/77f0>
Trace; c013c560 <path_release+40/180>
Trace; c012d9e1 <__alloc_pages+41/180>
Trace; c01241ba <vmtruncate+37a/b30>
Trace; c0124214 <vmtruncate+3d4/b30>
Trace; c0124382 <vmtruncate+542/b30>
Trace; c012779c <filemap_nopage+bc/200>
Trace; c01277c9 <filemap_nopage+e9/200>
Trace; c01124ba <__verify_write+3ba/8c0>
Trace; c0128742 <read_cache_page+42/120>
Trace; c0183a39 <nlmsvc_invalidate_client+12b19/32410>
Trace; c01277c9 <filemap_nopage+e9/200>
Trace; c0154922 <grok_partitions+1b02/1a570>
Trace; c01125f0 <__verify_write+4f0/8c0>
Trace; c0294922 <__generic_copy_from_user+32/60>
Trace; c0137fe1 <get_super+351/d30>
Trace; c0138460 <get_super+7d0/d30>
Trace; c013894f <get_super+cbf/d30>
Trace; c0148f53 <may_umount+793/77f0>
Trace; c0112320 <__verify_write+220/8c0>
Trace; c010700c <__read_lock_failed+1290/2704>
Trace; c01491ec <may_umount+a2c/77f0>
Trace; c014905c <may_umount+89c/77f0>
Trace; c01492b0 <may_umount+af0/77f0>
Trace; c0106f1b <__read_lock_failed+119f/2704>
Code; c0172f1b <nlmsvc_invalidate_client+1ffb/32410>
00000000 <_EIP>:
Code; c0172f1b <nlmsvc_invalidate_client+1ffb/32410> <=====
0: 8b 50 08 mov 0x8(%eax),%edx <=====
Code; c0172f1e <nlmsvc_invalidate_client+1ffe/32410>
3: 2b 51 f0 sub 0xfffffff0(%ecx),%edx
Code; c0172f21 <nlmsvc_invalidate_client+2001/32410>
6: 89 50 08 mov %edx,0x8(%eax)
Code; c0172f24 <nlmsvc_invalidate_client+2004/32410>
9: 8b 41 f4 mov 0xfffffff4(%ecx),%eax
Code; c0172f27 <nlmsvc_invalidate_client+2007/32410>
c: ff 48 04 decl 0x4(%eax)
Code; c0172f2a <nlmsvc_invalidate_client+200a/32410>
f: 8b 41 f8 mov 0xfffffff8(%ecx),%eax
Code; c0172f2d <nlmsvc_invalidate_client+200d/32410>
12: 83 f8 00 cmp $0x0,%eax


2 warnings and 1 error issued. Results may not be reliable.
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