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Subject2.5.74 - BUG in kfree during sys_close from netstat
Date
Mandrake 9.1, kernel 2.5.74. Started kmail, started kppp, connected, attempted 
to send or receive - nothing happened. Run netstat -an - and got

------------[ cut here ]------------
kernel BUG at mm/slab.c:1537!
invalid operand: 0000 [#2]
CPU: 0
EIP: 0060:[<c014c530>] Tainted: P
EFLAGS: 00010002
EIP is at kfree+0x2e0/0x2f0
eax: 0000002c ebx: 00040000 ecx: cf1fe670 edx: 00000001
esi: c02b9ee0 edi: 00000100 ebp: c6443f34 esp: c6443f14
ds: 007b es: 007b ss: 0068
Process netstat (pid: 10138, threadinfo=c6442000 task=c2e2ad40)
Stack: c6443f28 c02752fe cdcc0908 00000001 00000206 cdcc0908 c34438d4 c245537c
c6443f4c c01881b8 00000100 c34438d4 c34438d4 cffdf8e4 c6443f70 c0165089
c245537c c34438d4 c245537c c996fa98 c34438d4 c69ee724 00000000 c6443f98
Call Trace:
[<c02752fe>] raw_seq_start+0x4e/0x60
[<c01881b8>] seq_release_private+0x18/0x32
[<c0165089>] __fput+0x129/0x130
[<c0163703>] filp_close+0xc3/0x110
[<c01637e2>] sys_close+0x92/0x120
[<c010b527>] syscall_call+0x7/0xb

Code: 0f 0b 01 06 d1 93 2b c0 e9 44 fd ff ff 8d 76 00 55 89 e5 57

this happened more than once; previous stack (I do not know actually what
triggered it - I did not run netstat for sure) looked like:

PPP BSD Compression module registered
PPP Deflate Compression module registered
kfree_debugcheck: out of range ptr 100h.
------------[ cut here ]------------
kernel BUG at mm/slab.c:1537!
invalid operand: 0000 [#1]
CPU: 0
EIP: 0060:[<c014c530>] Tainted: P
EFLAGS: 00010002
EIP is at kfree+0x2e0/0x2f0
eax: 0000002c ebx: 00040000 ecx: cf1fe670 edx: 00000001
esi: c02b9ee0 edi: 00000100 ebp: c7789f34 esp: c7789f14
ds: 007b es: 007b ss: 0068
Process netstat (pid: 8509, threadinfo=c7788000 task=c2c4d2f0)
Stack: c7789f28 c02752fe c32d1dc8 00000001 00000206 c32d1dc8 c462c414 c245537c
c7789f4c c01881b8 00000100 c462c414 c462c414 cffdf8e4 c7789f70 c0165089
c245537c c462c414 c245537c c996fa98 c462c414 c2c3b8d4 00000000 c7789f98
Call Trace:
[<c02752fe>] raw_seq_start+0x4e/0x60
[<c01881b8>] seq_release_private+0x18/0x32
[<c0165089>] __fput+0x129/0x130
[<c0163703>] filp_close+0xc3/0x110
[<c01637e2>] sys_close+0x92/0x120
[<c010b527>] syscall_call+0x7/0xb

Code: 0f 0b 01 06 d1 93 2b c0 e9 44 fd ff ff 8d 76 00 55 89 e5 57
<3>kfree_debugcheck: out of range ptr 100h.

Just tried and when connection is done while kmail is not started it works. I
am not sure what kmail does - except that it actually is the only application
to actively use IP here most of the time.

-andrey
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