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SubjectBUG slab.c, buffer.c
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Date
I noticed strange behaviour recently with a driver i'm developing and
tried to replicate it in a simple module to determine if it was my
driver or a kernel bug. Basically i allocate 120k with kmalloc then
initialising this memory i get the following oops. (I've tried this on
several machines with the same results)

Any ideas what is wrong?

Note: the tainted flag is set due to no license in the test module, code
is attached.

ksymoops 2.4.3 on i686 2.4.10-ac10. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.10-ac10/ (default)
-m /boot/System.map-2.4.10-ac10 (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.

Reading Oops report from the terminal

kernel BUG at buffer.c:1655!
invalid operand: 0000
CPU: 0
EIP: 0010:[<c0132966>] Tainted: P
EFLAGS: 00010286
eax: 0000001d ebx: 00000000 ecx: c02b85a0 edx: 00001708
esi: 00001000 edi: c7790f8c ebp: 00001000 esp: c718be3c
ds: 0018 es: 0018 ss: 0018
Process syslogd (pid: 187, stackpage=c718b000)
Stack: c025af3a 00000677 00000bcb c11d8914 c7790f8c c11d8914 00000010
c6f31000
c718be70 c707dbbc 00001000 0000005f 00000000 c7790f8c c127fc00
c0133102
c70cc3bc c11d8914 00000bcb 00000bda c014eb2c c11d8914 c70cc3bc
c014ef2c
Call Trace: [<c0133102>] [<c014eb2c>] [<c014ef2c>] [<c014eb2c>]
[<c0124fea>]
[<c014d426>] [<c01305d6>] [<c014d404>] [<c01306e5>] [<c0106b2b>]

Code: 0f 0b 83 c4 08 90 8d 74 26 00 8b 54 24 20 8d 2c 32 3b 6c 24
<1>Unable to handle kernel NULL pointer dereference at virtual address
00000004 printing eip:
c015a675
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[<c015a675>] Tainted: P
EFLAGS: 00010292
eax: c127fa48 ebx: 00000000 ecx: 00000001 edx: 00000003
esi: c707de94 edi: c72f9944 ebp: c72fee9c esp: c741fe50
ds: 0018 es: 0018 ss: 0018
Process kjournald (pid: 75, stackpage=c741f000)
Stack: c707de94 c72fee9c c0157dc1 c707de94 c72fee9c c72fee9c c015833b
c72fee9c
c127fa00 c127fa00 c6f5e874 c127fa38 00000000 c6f5e29c c6f5e7ec
c0156863
c127fa00 c127fa50 c127fa00 c127fa00 00000000 c127fa94 c127fa50
00000000
Call Trace: [<c0157dc1>] [<c015833b>] [<c0156863>] [<c01b43e7>]
[<c01b8699>]
[<c0113c16>] [<c0105750>] [<c01114ca>] [<c015902b>] [<c0158f10>]
[<c0105478>]

Code: 83 7b 04 00 7d 35 68 fd 3c 26 c0 68 43 06 00 00 68 11 35 26
kernel BUG at slab.c:1247!
invalid operand: 0000
CPU: 0
EIP: 0010:[<c0127a59>] Tainted: P
EFLAGS: 00010082
eax: 0000001b ebx: c12010a0 ecx: c02b85a0 edx: 00001ddf
esi: c7070ec0 edi: 00000000 ebp: 00000000 esp: c65a7e70
ds: 0018 es: 0018 ss: 0018
Process insmod (pid: 395, stackpage=c65a7000)
Stack: c025939f 000004df c65a6000 00000001 00000070 00000010 00000020
00000246
c015a3d7 00000010 00000070 00000000 c127f800 c74ce6f4 c65a6000
c0154a14
c0261b8c 00000010 00000070 00000001 c74ce6f4 00000000 c74ce6f4
c65a7f84
Call Trace: [<c015a3d7>] [<c0154a14>] [<c015084e>] [<c0141512>]
[<c0142960>]
[<c0139615>] [<c0139c36>] [<c012fb17>] [<c012fe1c>] [<c0106b2b>]

Code: 0f 0b 83 c4 08 89 f6 f6 43 1d 04 74 4e b8 a5 c2 0f 17 87 06kernel
BUG at buffer.c:1655!
invalid operand: 0000
CPU: 0
EIP: 0010:[<c0132966>] Tainted: P
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010286
eax: 0000001d ebx: 00000000 ecx: c02b85a0 edx: 00001708
esi: 00001000 edi: c7790f8c ebp: 00001000 esp: c718be3c
ds: 0018 es: 0018 ss: 0018
Process syslogd (pid: 187, stackpage=c718b000)
Stack: c025af3a 00000677 00000bcb c11d8914 c7790f8c c11d8914 00000010
c6f31000
c718be70 c707dbbc 00001000 0000005f 00000000 c7790f8c c127fc00
c0133102
c70cc3bc c11d8914 00000bcb 00000bda c014eb2c c11d8914 c70cc3bc
c014ef2c
Call Trace: [<c0133102>] [<c014eb2c>] [<c014ef2c>] [<c014eb2c>]
[<c0124fea>]
[<c014d426>] [<c01305d6>] [<c014d404>] [<c01306e5>] [<c0106b2b>]
Code: 0f 0b 83 c4 08 90 8d 74 26 00 8b 54 24 20 8d 2c 32 3b 6c 24

>>EIP; c0132966 <__block_prepare_write+9e/2a0> <=====
Trace; c0133102 <block_prepare_write+22/3c>
Trace; c014eb2c <ext3_get_block+0/70>
Trace; c014ef2c <ext3_prepare_write+6c/f4>
Trace; c014eb2c <ext3_get_block+0/70>
Trace; c0124fea <generic_file_write+3aa/5f8>
Trace; c014d426 <ext3_file_write+22/5c>
Trace; c01305d6 <do_readv_writev+1b6/230>
Trace; c014d404 <ext3_file_write+0/5c>
Trace; c01306e4 <sys_writev+40/54>
Trace; c0106b2a <system_call+32/38>
Code; c0132966 <__block_prepare_write+9e/2a0>
00000000 <_EIP>:
Code; c0132966 <__block_prepare_write+9e/2a0> <=====
0: 0f 0b ud2a <=====
Code; c0132968 <__block_prepare_write+a0/2a0>
2: 83 c4 08 add $0x8,%esp
Code; c013296a <__block_prepare_write+a2/2a0>
5: 90 nop
Code; c013296c <__block_prepare_write+a4/2a0>
6: 8d 74 26 00 lea 0x0(%esi,1),%esi
Code; c0132970 <__block_prepare_write+a8/2a0>
a: 8b 54 24 20 mov 0x20(%esp,1),%edx
Code; c0132974 <__block_prepare_write+ac/2a0>
e: 8d 2c 32 lea (%edx,%esi,1),%ebp
Code; c0132976 <__block_prepare_write+ae/2a0>
11: 3b 6c 24 00 cmp 0x0(%esp,1),%ebp

<1>Unable to handle kernel NULL pointer dereference at virtual address
00000004c015a675
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[<c015a675>] Tainted: P
EFLAGS: 00010292
eax: c127fa48 ebx: 00000000 ecx: 00000001 edx: 00000003
esi: c707de94 edi: c72f9944 ebp: c72fee9c esp: c741fe50
ds: 0018 es: 0018 ss: 0018
Process kjournald (pid: 75, stackpage=c741f000)
Stack: c707de94 c72fee9c c0157dc1 c707de94 c72fee9c c72fee9c c015833b
c72fee9c
c127fa00 c127fa00 c6f5e874 c127fa38 00000000 c6f5e29c c6f5e7ec
c0156863
c127fa00 c127fa50 c127fa00 c127fa00 00000000 c127fa94 c127fa50
00000000
Call Trace: [<c0157dc1>] [<c015833b>] [<c0156863>] [<c01b43e7>]
[<c01b8699>]
[<c0113c16>] [<c0105750>] [<c01114ca>] [<c015902b>] [<c0158f10>]
[<c0105478>]
Code: 83 7b 04 00 7d 35 68 fd 3c 26 c0 68 43 06 00 00 68 11 35 26

>>EIP; c015a674 <__journal_remove_journal_head+8/110> <=====
Trace; c0157dc0 <__try_to_free_cp_buf+20/3c>
Trace; c015833a <__journal_clean_checkpoint_list+4a/68>
Trace; c0156862 <journal_commit_transaction+1ee/f3c>
Trace; c01b43e6 <serial_in+36/3c>
Trace; c01b8698 <serial_console_write+178/184>
Trace; c0113c16 <__call_console_drivers+3a/4c>
Trace; c0105750 <__switch_to+2c/b8>
Trace; c01114ca <schedule+25e/394>
Trace; c015902a <kjournald+10a/1b0>
Trace; c0158f10 <commit_timeout+0/c>
Trace; c0105478 <kernel_thread+28/38>
Code; c015a674 <__journal_remove_journal_head+8/110>
00000000 <_EIP>:
Code; c015a674 <__journal_remove_journal_head+8/110> <=====
0: 83 7b 04 00 cmpl $0x0,0x4(%ebx) <=====
Code; c015a678 <__journal_remove_journal_head+c/110>
4: 7d 35 jge 3b <_EIP+0x3b> c015a6ae
<__journal_remove_journal_head+42/110>
Code; c015a67a <__journal_remove_journal_head+e/110>
6: 68 fd 3c 26 c0 push $0xc0263cfd
Code; c015a67e <__journal_remove_journal_head+12/110>
b: 68 43 06 00 00 push $0x643
Code; c015a684 <__journal_remove_journal_head+18/110>
10: 68 11 35 26 00 push $0x263511

kernel BUG at slab.c:1247!
invalid operand: 0000
CPU: 0
EIP: 0010:[<c0127a59>] Tainted: P
EFLAGS: 00010082
eax: 0000001b ebx: c12010a0 ecx: c02b85a0 edx: 00001ddf
esi: c7070ec0 edi: 00000000 ebp: 00000000 esp: c65a7e70
ds: 0018 es: 0018 ss: 0018
Process insmod (pid: 395, stackpage=c65a7000)
Stack: c025939f 000004df c65a6000 00000001 00000070 00000010 00000020
00000246
c015a3d7 00000010 00000070 00000000 c127f800 c74ce6f4 c65a6000
c0154a14
c0261b8c 00000010 00000070 00000001 c74ce6f4 00000000 c74ce6f4
c65a7f84
Call Trace: [<c015a3d7>] [<c0154a14>] [<c015084e>] [<c0141512>]
[<c0142960>]
[<c0139615>] [<c0139c36>] [<c012fb17>] [<c012fe1c>] [<c0106b2b>]

Code: 0f 0b 83 c4 08 89 f6 f6 43 1d 04 74 4e b8 a5 c2 0f 17 87 06

>>EIP; c0127a58 <kmalloc+188/228> <=====
Trace; c015a3d6 <__jbd_kmalloc+22/78>
Trace; c0154a14 <journal_start+80/e0>
Trace; c015084e <ext3_dirty_inode+3a/84>
Trace; c0141512 <__mark_inode_dirty+2a/80>
Trace; c0142960 <update_atime+44/54>
Trace; c0139614 <path_walk+62c/748>
Trace; c0139c36 <open_namei+82/514>
Trace; c012fb16 <filp_open+3a/5c>
Trace; c012fe1c <sys_open+38/b4>
Trace; c0106b2a <system_call+32/38>
Code; c0127a58 <kmalloc+188/228>
00000000 <_EIP>:
Code; c0127a58 <kmalloc+188/228> <=====
0: 0f 0b ud2a <=====
Code; c0127a5a <kmalloc+18a/228>
2: 83 c4 08 add $0x8,%esp
Code; c0127a5c <kmalloc+18c/228>
5: 89 f6 mov %esi,%esi
Code; c0127a5e <kmalloc+18e/228>
7: f6 43 1d 04 testb $0x4,0x1d(%ebx)
Code; c0127a62 <kmalloc+192/228>
b: 74 4e je 5b <_EIP+0x5b> c0127ab2
<kmalloc+1e2/228>
Code; c0127a64 <kmalloc+194/228>
d: b8 a5 c2 0f 17 mov $0x170fc2a5,%eax
Code; c0127a6a <kmalloc+19a/228>
12: 87 06 xchg %eax,(%esi)



The code being use to generate this is:

int init_module(void)
{
addr = kmalloc(GFP_KERNEL, mem_size);
if(addr != NULL)
{
u8 *byte;
u32 ix;

byte = addr;
for(ix = 0; ix < mempage_size; ix++)
{
*byte = 0;
byte++;
}
}
return 0;
}




--
Martin Donnelly Senior Software Engineer
RAMiX Europe Ltd
99 little bugs in the code, 99 bugs in the code,
fix one bug, compile it again...
101 little bugs in the code....

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