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Date: Fri, 21 Dec 2001 09:05:11 -0800
From: Greg KH <greg@kroah.com>
To: linux-kernel@vger.kernel.org
Subject: oops in mm/memory.c remap_page_range() in 2.2.20
Message-ID: <20011221090511.A21051@kroah.com>
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Running "cvs update" on a 2.2.20 kernel with 16Mb of real memory I got
the following oops:

Unable to handle kernel NULL pointer dereference at virtual address 00000002
current->tss.cr3 = 00f53000, %cr3 = 00f53000
*pde = 00000000
Oops: 0000
CPU:    0
EIP:    0010:[<c01194a0>]
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010296
eax: 00000002   ebx: c0fe4f50   ecx: 00000000   edx: c0229ff8
esi: 00000000   edi: c0fe4f50   ebp: 00000002   esp: c0805f04
ds: 0018   es: 0018   ss: 0018
Process cvs (pid: 21185, process nr: 44, stackpage=c0805000)
Stack: c0fe4f50 00000000 c0fe4fcc c011956f 00000002 00000000 c0804000 c0fe4f9c 
       c012247e c0fe4f50 00000000 00000000 c0fe4f50 00000243 c0ebd200 00000000 
       00000048 c0fe4f50 00000243 00000000 3c2367de 3c2367de 3c2367de 00000006 
Call Trace: [<c011956f>] [<c012247e>] [<c012aa62>] [<c0122ea4>] [<c01230ea>] [<c01079c4>] 
Code: 8b 4d 00 89 4c 24 10 8b 5d 04 8b 75 08 29 de 8b 55 2c 3b 54 

>>EIP; c01194a0 <remap_page_range+654/6f0>   <=====
Trace; c011956f <vmtruncate+33/558>
Trace; c012247e <__get_free_pages+1e3e/2820>
Trace; c012aa62 <open_namei+2be/2ec>
Trace; c0122ea4 <filp_open+44/f0>
Trace; c01230ea <get_unused_fd+19a/210>
Trace; c01079c4 <dump_thread+127c/22f0>
Code;  c01194a0 <remap_page_range+654/6f0>
00000000 <_EIP>:
Code;  c01194a0 <remap_page_range+654/6f0>   <=====
   0:   8b 4d 00                  mov    0x0(%ebp),%ecx   <=====
Code;  c01194a3 <remap_page_range+657/6f0>
   3:   89 4c 24 10               mov    %ecx,0x10(%esp,1)
Code;  c01194a7 <remap_page_range+65b/6f0>
   7:   8b 5d 04                  mov    0x4(%ebp),%ebx
Code;  c01194aa <remap_page_range+65e/6f0>
   a:   8b 75 08                  mov    0x8(%ebp),%esi
Code;  c01194ad <remap_page_range+661/6f0>
   d:   29 de                     sub    %ebx,%esi
Code;  c01194af <remap_page_range+663/6f0>
   f:   8b 55 2c                  mov    0x2c(%ebp),%edx
Code;  c01194b2 <remap_page_range+666/6f0>
  12:   3b 54 00 00               cmp    0x0(%eax,%eax,1),%edx

Any suggestions?

thanks,

greg k-h
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