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kjournald oops



Hello List,
Running 2.4.21-pre3-ac1 SMP with new quotas (usr and grp), this oops
showed up while copying a large amount (about 50gigs, only 1.6 made it
before the oops).  I'm trying to reproduce as we speak.  

Unable to handle kernel NULL pointer dereference at virtual address
00000004
c0130956
*pde = 00000000
Oops: 0002
CPU:    0
EIP:    0010:[<c0130956>]    Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010246
eax: 00000000   ebx: c18054f0   ecx: e8762000   edx: e876205c
esi: 00000000   edi: 00000000   ebp: 00000000   esp: e8763bdc
ds: 0018   es: 0018   ss: 0018
Process kjournald (pid: 10086, stackpage=e8763000)
Stack: 00000001 00000001 00000046 c01e907c 00000000 f7a970b8 f7bfa018
c2842cc4
       eac6f000 c1000020 eac6f000 c012db6a c281deec 00000000 cccccccd
c2848c00
       c012ef19 c2842cc4 eac6f000 00000019 c2842ccc c2842cd4 c02b5224
e8762000
Call Trace:    [<c01e907c>] [<c012db6a>] [<c012ef19>] [<c01300a9>]
[<c013015c>]
  [<c0130c52>] [<c0130f0b>] [<c0136610>] [<c013676c>] [<c01be751>]
[<c0222e23>]
  [<c011bb0b>] [<c011b9b1>] [<c011b73b>] [<c0108b6d>] [<c01bed9a>]
[<c013a636>]
  [<c01bedfd>] [<c01bef97>] [<c016e4fd>] [<c016d65b>] [<c02227c9>]
[<c021eb2f>]
  [<c01c5cd7>] [<c0170236>] [<c01700e0>] [<c0105676>] [<c0170100>]

Code: 89 58 04 89 03 89 53 04 89 59 5c 89 7b 0c ff 41 68 83 c4 1c

>>EIP; c0130956 <__free_pages_ok+286/2a0>   <=====
Trace; c01e907c <aac_io_done+1c/30>
Trace; c012db6a <kmem_slab_destroy+aa/d0>
Trace; c012ef19 <kmem_cache_reap+2b9/330>
Trace; c01300a9 <shrink_caches+19/90>
Trace; c013015c <try_to_free_pages_zone+3c/60>
Trace; c0130c52 <balance_classzone+62/200>
Trace; c0130f0b <__alloc_pages+11b/170>
Trace; c0136610 <alloc_bounce_page+10/a0>
Trace; c013676c <create_bounce+2c/148>
Trace; c01be751 <__make_request+a1/5e0>
Trace; c0222e23 <net_rx_action+b3/170>
Trace; c011bb0b <bh_action+4b/80>
Trace; c011b9b1 <tasklet_hi_action+61/a0>
Trace; c011b73b <do_softirq+6b/d0>
Trace; c0108b6d <do_IRQ+dd/f0>
Trace; c01bed9a <generic_make_request+10a/120>
Trace; c013a636 <__refile_buffer+56/60>
Trace; c01bedfd <submit_bh+4d/70>
Trace; c01bef97 <ll_rw_block+177/1c0>
Trace; c016e4fd <journal_brelse_array+1d/30>
Trace; c016d65b <journal_commit_transaction+3ab/10f2>
Trace; c02227c9 <netif_rx+a9/1d0>
Trace; c021eb2f <alloc_skb+ef/1c0>
Trace; c01c5cd7 <receive_packet+2c7/3e0>
Trace; c0170236 <kjournald+136/200>
Trace; c01700e0 <commit_timeout+0/10>
Trace; c0105676 <kernel_thread+26/30>
Trace; c0170100 <kjournald+0/200>
Code;  c0130956 <__free_pages_ok+286/2a0>
00000000 <_EIP>:
Code;  c0130956 <__free_pages_ok+286/2a0>   <=====
   0:   89 58 04                  mov    %ebx,0x4(%eax)   <=====
Code;  c0130959 <__free_pages_ok+289/2a0>
   3:   89 03                     mov    %eax,(%ebx)
Code;  c013095b <__free_pages_ok+28b/2a0>
   5:   89 53 04                  mov    %edx,0x4(%ebx)
Code;  c013095e <__free_pages_ok+28e/2a0>
   8:   89 59 5c                  mov    %ebx,0x5c(%ecx)
Code;  c0130961 <__free_pages_ok+291/2a0>
   b:   89 7b 0c                  mov    %edi,0xc(%ebx)
Code;  c0130964 <__free_pages_ok+294/2a0>
   e:   ff 41 68                  incl   0x68(%ecx)
Code;  c0130967 <__free_pages_ok+297/2a0>
  11:   83 c4 1c                  add    $0x1c,%esp


Any pointers would be appriciated.
TIA,
Dale

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