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SubjectRe: [PATCH] updated preempt-kernel
[1.] NULL pointer deference in con_flush_chars with preempt patch
[2.]
Ok, running with preempt-kernel-rml-2.4.12-ac3-2.patch I had a crash
yesterday. It occured when the machine was under
light load, I had just exited X, and I was logging off a console - I may
have hit ctrl-d twice. I did a little investigating myself, and the
closest I could find in the archives was the problem mentioned in
http://www.geocrawler.com/archives/3/35/1998/11/0/217652/ , except my
crash is occuring at console close instead of open. It may not be
preempt related, just preempt induced :-)

Looks like a race condition on console close, driver_data gets set to NULL
but a interrupt-induced con_flush_chars then tries to access it.

[3.] preempt, console
[4.] Linux version 2.4.12-ac3-preempt (root@micro) (gcc version 2.95.4 20011006 (Debian prerelease)) #2 Sat Oct 20 19:07:28 BST 2001
[5.]
ksymoops 2.4.1 on i686 2.4.12-ac3-preempt. Options used
-V (default)
-k /var/log/ksymoops/20011020212838.ksyms (specified)
-l /var/log/ksymoops/20011020212838.modules (specified)
-o /lib/modules/2.4.12-ac3-preempt/ (default)
-m /boot/System.map-2.4.12-ac3-preempt (default)

Unable to handle kernel NULL pointer dereference at virtual address 00000000
c01878d7
*pde = 00000000
Oops: 0000
CPU: 0
EIP: 0010:[con_flush_chars+31/52] Tainted: P
EFLAGS: 00010246
eax: 00000000 ebx: 00000000 ecx: c0200ac0 edx: c51a4000
esi: c51a4000 edi: c51a4169 ebp: 00000000 esp: c5ff7eb0
ds: 0018 es: 0018 ss: 0018
Process keventd (pid: 2, stackpage=c5ff7000)
Stack: c51a4980 c017c0ff c51a4000 c51a4568 c51a4168 c5ff7f9c 0008e000 00000050
00000010 00000000 c4d55220 00000000 00000050 c51a4569 c51a4169 c0271248
00000001 0000001d c019d4ab c0271248 00000001 0000000d 0000001d 00000008
Call Trace: [n_tty_receive_buf+4059/4236] [fbcon_cursor+167/456] [complete_change_console+146/152] [flush_to_ldisc+251/260] [__run_task_queue+109/124]
Code: 8b 03 50 e8 31 c9 ff ff e8 38 be f8 ff 83 c4 04 5b c3 8d 76
Using defaults from ksymoops -t elf32-i386 -a i386
Code; 00000000 Before first symbol
00000000 <_EIP>:
Code; 00000000 Before first symbol
0: 8b 03 mov (%ebx),%eax
Code; 00000002 Before first symbol
2: 50 push %eax
Code; 00000003 Before first symbol
3: e8 31 c9 ff ff call ffffc939 <_EIP+0xffffc939> ffffc939 <END_OF_CODE+38d6916f/????>
Code; 00000008 Before first symbol
8: e8 38 be f8 ff call fff8be45 <_EIP+0xfff8be45> fff8be45 <END_OF_CODE+38cf867b/????>
Code; 0000000d Before first symbol
d: 83 c4 04 add $0x4,%esp
Code; 00000010 Before first symbol
10: 5b pop %ebx
Code; 00000011 Before first symbol
11: c3 ret
Code; 00000012 Before first symbol
12: 8d 76 00 lea 0x0(%esi),%esi
14 warnings issued. Results may not be reliable.

[6.] Not trivially reproducible
[7.]
Gnu C 2.95.4
Gnu make 3.79.1
util-linux 2.11h
mount 2.11h
modutils 2.4.10
e2fsprogs 1.25
reiserfsprogs 3.x.0j
Linux C Library 2.2.4
Dynamic linker (ldd) 2.2.4
Procps 2.0.7
Net-tools 1.60
Console-tools 0.2.3
Sh-utils 2.0.11
Modules Loaded ide-cd cdrom rtc tulip sb sb_lib uart401 sound soundcore serial hid usb-uhci usbcore mousedev input atyfb fbcon-cfb24 fbcon-cfb8 fbcon-cfb16 fbcon-cfb32 apm unix

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 3
model name : Pentium II (Klamath)
stepping : 4
cpu MHz : 267.284
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov mmx
bogomips : 532.48

0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0070-007f : rtc
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : ide1
01f0-01f7 : ide0
0220-022f : soundblaster
02f8-02ff : serial(set)
0330-0333 : MPU-401 UART
0376-0376 : ide1
03c0-03df : vga+
03f6-03f6 : ide0
03f8-03ff : serial(set)
0cf8-0cff : PCI conf1
4f00-4f3f : Intel Corporation 82371AB PIIX4 ACPI
5f00-5f1f : Intel Corporation 82371AB PIIX4 ACPI
d000-dfff : PCI Bus #01
d000-d0ff : ATI Technologies Inc 3D Rage Pro AGP 1X/2X
e000-e01f : Intel Corporation 82371AB PIIX4 USB
e000-e01f : usb-uhci
e400-e47f : Digital Equipment Corporation DECchip 21041 [Tulip Pass 3]
e400-e47f : tulip
f000-f00f : Intel Corporation 82371AB PIIX4 IDE
f000-f007 : ide0
f008-f00f : ide1
00000000-0009ffff : System RAM
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-05ffffff : System RAM
00100000-001d9ef3 : Kernel code
001d9ef4-0020cb47 : Kernel data
e0000000-e3ffffff : Intel Corporation 440LX/EX - 82443LX/EX Host bridge
e4000000-e5ffffff : PCI Bus #01
e5000000-e5000fff : ATI Technologies Inc 3D Rage Pro AGP 1X/2X
e6000000-e6ffffff : PCI Bus #01
e6000000-e6ffffff : ATI Technologies Inc 3D Rage Pro AGP 1X/2X
e6000000-e6ffffff : atyfb
e8000000-e800007f : Digital Equipment Corporation DECchip 21041 [Tulip Pass 3]
e8000000-e800007f : tulip
ffff0000-ffffffff : reserved
00:00.0 Host bridge: Intel Corporation 440LX/EX - 82443LX/EX Host bridge (rev 03)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ >SERR- <PERR-
Latency: 64
Region 0: Memory at e0000000 (32-bit, prefetchable) [size=64M]
Capabilities: <available only to root>
00:01.0 PCI bridge: Intel Corporation 440LX/EX - 82443LX/EX AGP bridge (rev 03) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap- 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64
Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
I/O behind bridge: 0000d000-0000dfff
Memory behind bridge: e4000000-e5ffffff
Prefetchable memory behind bridge: e6000000-e6ffffff
BridgeCtl: Parity+ SERR+ NoISA- VGA+ MAbort- >Reset- FastB2B-
00:02.0 ISA bridge: Intel Corporation 82371AB PIIX4 ISA (rev 01)
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0

00:02.1 IDE interface: Intel Corporation 82371AB PIIX4 IDE (rev 01) (prog-if 80 [Master])
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64
Region 4: I/O ports at f000 [size=16]

00:02.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01) (prog-if 00 [UHCI])
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64
Interrupt: pin D routed to IRQ 11
Region 4: I/O ports at e000 [size=32]

00:02.3 Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 01)
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin ? routed to IRQ 9

00:10.0 Ethernet controller: Digital Equipment Corporation DECchip 21041 [Tulip Pass 3] (rev 21)
Subsystem: D-Link System Inc DE-530+
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at e400 [size=128]
Region 1: Memory at e8000000 (32-bit, non-prefetchable) [size=128]
Expansion ROM at e7000000 [disabled] [size=256K]
01:00.0 VGA compatible controller: ATI Technologies Inc 3D Rage Pro AGP 1X/2X (rev 5c) (prog-if 00 [VGA])
Subsystem: ATI Technologies Inc: Unknown device 0040
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (2000ns min), cache line size 08
Region 0: Memory at e6000000 (32-bit, prefetchable) [size=16M]
Region 1: I/O ports at d000 [size=256]
Region 2: Memory at e5000000 (32-bit, non-prefetchable) [size=4K]
Expansion ROM at <unassigned> [disabled] [size=128K]
Capabilities: <available only to root>
No SCSI.

--
Colin Phipps <cph@cph.demon.co.uk> http://www.cph.demon.co.uk/
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