[OOPS] test12 - bdflush

From: Dan Aloni (karrde@callisto.yi.org)
Date: Thu Dec 14 2000 - 11:04:49 EST


While running the test12 kernel with the test11 arch/i386, I've trapped an
Oops message in my log. I'm not sure if it has something to do with using
the arch/i386 code from test11, but it seems necessary to post it since
test12 introduces changes to kswapd-bdflush.

I am currently running test11 since test12 gave problems later on
following this Oops.

ksymoops 2.3.5 on i686 2.4.0-test11. Options used
     -v vmlinux (specified)
     -K (specified)
     -L (specified)
     -O (specified)
     -m System.map (specified)

Unable to handle kernel NULL pointer dereference at virtual address 0000000c
c012949e
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[page_launder+1038/1824]
EFLAGS: 00010202
eax: 00000000 ebx: c12095c0 ecx: 00001b1e edx: c012ae37
esi: c12095dc edi: 00000000 ebp: 00000d5d esp: c12e3fb4
ds: 0018 es: 0018 ss: 0018
Process bdflush (pid: 6, stackpage=c12e3000)
Stack: 00203206 00000000 c12e2000 0008e000 00000001 00000000 00000000 00000018
       00000000 c0131dcf 00000003 00000000 00010f00 c1229f88 c1229fc4 c0108904
       c1229fc4 00000078 c1229fc4
Call Trace: [add_vfsmnt+295/544] [kernel_thread+40/56]
Code: 8b 40 0c 8b 10 85 d2 0f 84 ba 04 00 00 83 7c 24 14 00 75 73

Using defaults from ksymoops -t elf32-i386 -a i386

Code; 00000000 Before first symbol
00000000 <_EIP>:
Code; 00000000 Before first symbol
   0: 8b 40 0c mov 0xc(%eax),%eax
Code; 00000003 Before first symbol
   3: 8b 10 mov (%eax),%edx
Code; 00000005 Before first symbol
   5: 85 d2 test %edx,%edx
Code; 00000007 Before first symbol
   7: 0f 84 ba 04 00 00 je 4c7 <_EIP+0x4c7> 000004c7 Before first symbol
Code; 0000000d Before first symbol
   d: 83 7c 24 14 00 cmpl $0x0,0x14(%esp,1)
Code; 00000012 Before first symbol
  12: 75 73 jne 87 <_EIP+0x87> 00000087 Before first symbol

Linux callisto.yi.org 2.4.0-test11 #1 Tue Dec 12 20:08:57 IST 2000 i686
unknown
Kernel modules 2.3.13
Gnu C 2.95.2
Gnu Make 3.79.1
Binutils 2.10
Linux C Library 2.1.3
Dynamic linker ldd (GNU libc) 2.1.3
Procps 2.0.4
Mount 2.9u
Net-tools permitted
Console-tools 1999.03.02
Sh-utils 2.0

-- 
Dan Aloni 
dax@karrde.org

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