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Subjectproblems with 2.5.61-mm1
I've been beating on various versions of 2.5.59 all day long with no
problems that I didn't cause. I started testing 2.5.61-mm1 and rand
into a couple problems right away.

The first I really doubt is -mm specific. I gets _loads_ of these, and
the e1000 isn't working:
NETDEV WATCHDOG: eth0: transmit timed out
e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex

The e1000 driver hasn't been touched in weeks. Here's my /proc/interrupts:
http://www.sr71.net/linux/interrupts
I'm pretty sure we can see the problem here. Almost all interrupts are
going to CPU0. Is this a summit thing?

The other looks a bit more insidious.

Unable to handle kernel NULL pointer dereference at virtual address 0000003d
c011af77
*pde = 1cf93001
Oops: 0002
CPU: 1
EIP: 0060:[<c011af77>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010202
eax: 00000029 ebx: de562870 ecx: dfa85074 edx: 000000e4
esi: deefc140 edi: cf5227c0 ebp: cf522780 esp: dcad7f08
ds: 007b es: 007b ss: 0068
Stack: cf522780 000000ff df734c80 00000008 00000000 cc266680 00000100
dfa85074
deefc100 c6ac3900 c6ac39a4 00000011 00000000 c011b46c 00000011
c6ac3900
00000004 00000286 00001000 cc266680 fffffff4 bffff7a0 00000011
00000000
[<c011b46c>] copy_process+0x3a4/0x902
[<c011ba1a>] do_fork+0x50/0x166
[<c0126cca>] sys_rt_sigprocmask+0xdc/0x150
[<c010792b>] sys_fork+0x37/0x4a
[<c0109347>] syscall_call+0x7/0xb
Code: f0 ff 40 14 89 03 83 c3 04 83 ea 01 75 e1 8b 44 24 20 f0 ff


>>EIP; c011af77 <copy_files+18f/2c6> <=====

>>ebx; de562870 <END_OF_CODE+1e0f3f2c/????>
>>ecx; dfa85074 <END_OF_CODE+1f616730/????>
>>esi; deefc140 <END_OF_CODE+1ea8d7fc/????>
>>edi; cf5227c0 <END_OF_CODE+f0b3e7c/????>
>>ebp; cf522780 <END_OF_CODE+f0b3e3c/????>
>>esp; dcad7f08 <END_OF_CODE+1c6695c4/????>

Code; c011af77 <copy_files+18f/2c6>
00000000 <_EIP>:
Code; c011af77 <copy_files+18f/2c6> <=====
0: f0 ff 40 14 lock incl 0x14(%eax) <=====
Code; c011af7b <copy_files+193/2c6>
4: 89 03 mov %eax,(%ebx)
Code; c011af7d <copy_files+195/2c6>
6: 83 c3 04 add $0x4,%ebx
Code; c011af80 <copy_files+198/2c6>
9: 83 ea 01 sub $0x1,%edx
Code; c011af83 <copy_files+19b/2c6>
c: 75 e1 jne ffffffef <_EIP+0xffffffef>
Code; c011af85 <copy_files+19d/2c6>
e: 8b 44 24 20 mov 0x20(%esp,1),%eax
Code; c011af89 <copy_files+1a1/2c6>
12: f0 ff 00 lock incl (%eax)

more disassembly
c011af64: 74 1f je c011af85 <copy_files+0x19d>
c011af66: 8b 4c 24 1c mov 0x1c(%esp,1),%ecx
c011af6a: 8b 01 mov (%ecx),%eax
c011af6c: 83 c1 04 add $0x4,%ecx
c011af6f: 85 c0 test %eax,%eax
c011af71: 89 4c 24 1c mov %ecx,0x1c(%esp,1)
c011af75: 74 04 je c011af7b <copy_files+0x193>
c011af77: f0 ff 40 14 lock incl 0x14(%eax) <========
c011af7b: 89 03 mov %eax,(%ebx)
c011af7d: 83 c3 04 add $0x4,%ebx
c011af80: 83 ea 01 sub $0x1,%edx
c011af83: 75 e1 jne c011af66 <copy_files+0x17e>
c011af85: 8b 44 24 20 mov 0x20(%esp,1),%eax
c011af89: f0 ff 40 04 lock incl 0x4(%eax)
c011af8d: 8b 45 08 mov 0x8(%ebp),%eax
c011af90: 89 df mov %ebx,%edi
c011af92: 2b 44 24 18 sub 0x18(%esp,1),%eax
c011af96: 8d 34 85 00 00 00 00 lea 0x0(,%eax,4),%esi

I didn't compile with -g, but I have a hunch it is this:
for (i = open_files; i != 0; i--) {
struct file *f = *old_fds++;
if (f)
get_file(f); <=============
*new_fds++ = f;
}

The offset of f_count in struct file is 0x14. The "test %eax,%eax" is
probably the "if (f)"
--
Dave Hansen
haveblue@us.ibm.com

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