Re: 2.6.19-rc2-mm2

[Mariusz Kozlowski]

Hello, 

	I installed 2.6.19-rc2-mm2 without kernel debugging options enabled first. 
The output below is what I saw when the kernel started. Then I enabled 
debugging and system hangs with oops with no trace in the logs. It is not 
easily repeatable though. It happens from time to time.

BUG: unable to handle kernel NULL pointer dereference at virtual address 
00000000
 printing eip:
ded5bc12
*pde = 00000000
Oops: 0000 [#1]
PREEMPT 
last sysfs 
file: /class/pcmcia_socket/pcmcia_socket0/available_resources_setup_done
Modules linked in: pcmcia firmware_class yenta_socket rsrc_nonstatic 
pcmcia_core
CPU:    0
EIP:    0060:[<ded5bc12>]    Not tainted VLI
EFLAGS: 00010002   (2.6.19-rc2-mm2 #1)
EIP is at get_pcmcia_device+0x1e/0x93 [pcmcia]
eax: ddba2828   ebx: fffffff0   ecx: 00000000   edx: 00000000
esi: 00000000   edi: 00000000   ebp: 00000246   esp: ddac7f30
ds: 007b   es: 007b   ss: 0068
Process cardmgr (pid: 4807, ti=ddac6000 task=ddea7030 task.ti=ddac6000)
Stack: 40000000 00000000 c00c6409 ddba2828 ded5c777 00000001 00000000 ddba2400 
       0000000c ddc4930c ded60040 dd5a21c0 bfc9a600 c00c6409 c01661d4 bfc9a600 
       dd5a21c0 dd5a21c0 00000004 ddac6000 c016622d 00000000 ddea7030 dd5a21c0 
Call Trace:
 [<ded5c777>] ds_ioctl+0x88b/0x89f [pcmcia]
 [<c01661d4>] do_ioctl+0x64/0x6d
 [<c016622d>] vfs_ioctl+0x50/0x27b
 [<c016648c>] sys_ioctl+0x34/0x50
 [<c0102eae>] sysenter_past_esp+0x5f/0x85
 =======================
Code: 3f e1 89 d8 e8 f6 7e b1 ff 31 c0 5b c3 55 57 56 53 89 d7 9c 5d fa 89 e2 
81 e2 00 e0 ff ff 83 42 14 01 8b 90 44 01 00 00 8d 5a f0 <8b> 4b 10 0f 18 01 
90 8d b0 44 01 00 00 39 d6 75 12 eb 37 89 c8 
EIP: [<ded5bc12>] get_pcmcia_device+0x1e/0x93 [pcmcia] SS:ESP 0068:ddac7f30
 <6>note: cardmgr[4807] exited with preempt_count 1
pccard: PCMCIA card inserted into slot 1
cs: memory probe 0xa0000000-0xa0ffffff: clean.

When running without debug options enabled also these were seen amongst dmesg 
lines:

[drm:radeon_cp_init] *ERROR* radeon_cp_init called without lock held
[drm:drm_unlock] *ERROR* Process 5131 using kernel context 0

When debug options were enabled these above disappeared. System info:

Linux orion 2.6.19-rc2-mm2 #2 PREEMPT Fri Oct 20 13:14:25 CEST 2006 i686 
Intel(R) Pentium(R) 4 CPU 2.40GHz GNU/Linux
 
Gnu C                  4.1.1
Gnu make               3.81
binutils               2.16.1
util-linux             2.12r
mount                  2.12r
module-init-tools      3.2.2
e2fsprogs              1.39
pcmcia-cs              3.2.8
nfs-utils              1.0.6
Linux C Library        > libc.2.4
Dynamic linker (ldd)   2.4
Procps                 3.2.6
Net-tools              1.60
Kbd                    1.12
Sh-utils               5.94
udev                   087
Modules Loaded         orinoco_cs orinoco hermes pcmcia firmware_class 
yenta_socket rsrc_nonstatic pcmcia_core

This time it _is_ -mm ;-)

Regards,

	Mariusz Kozlowski
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