[1.] one-line summary of the problem
Segfault when trying to read from an 640MB MO disk (2048-byte sectors) Also
causes a hard crash when writing...reset required
[2.] full description of the problem
The problem did not occur when processing 128MB disks (they use a 512-byte sector
size). read and write work fine here...
[3.] Keywords...
fat vfat 2048-byte sector magneto-optical
[4.] Kernel info:
Linux version 2.4.2K6 ([EMAIL PROTECTED]) (gcc version 2.96 20000731 (Red Hat
Linux 7.0)) #1 Mon Feb 26 18:11:39 CST 2001
[5.] OOPS info:
[6.] shell program or script
mount /mnt/MO
cp /mnt/MO/dechris.tar.gz .
[7.] Environment:
BASH=/bin/bash
BASH_ENV=/root/.bashrc
BASH_VERSINFO=([0]="2" [1]="04" [2]="11" [3]="1" [4]="release"
[5]="i386-redhat-linux-gnu")
BASH_VERSION='2.04.11(1)-release'
COLORTERM=gnome-terminal
DIRSTACK=()
DISPLAY=:0
EUID=0
GROUPS=()
HISTSIZE=1000
HOME=/root
HOSTNAME=localhost.localdomain
HOSTTYPE=i386
IFS='
'
INPUTRC=/etc/inputrc
KDEDIR=/usr
LANG=en_US
LESSOPEN='|/usr/bin/lesspipe.sh %s'
LOGNAME=root
LS_COLORS='no=00:fi=00:di=01;34:ln=01;36:pi=40;33:so=01;35:bd=40;33;01:cd=40;33;01:or=01;05;37;41:mi=01;05;37;41:ex=01;32:*.cmd=01;32:*.exe=01;32:*.com=01;32:*.btm=01;32:*.bat=01;32:*.sh=01;32:*.csh=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.gz=01;31:*.bz2=01;31:*.bz=01;31:*.tz=01;31:*.rpm=01;31:*.cpio=01;31:*.jpg=01;35:*.gif=01;35:*.bmp=01;35:*.xbm=01;35:*.xpm=01;35:*.png=01;35:*.tif=01;35:'
MACHTYPE=i386-redhat-linux-gnu
MAIL=/var/spool/mail/root
OPTERR=1
OPTIND=1
OSTYPE=linux-gnu
PATH=/usr/local/sbin:/usr/sbin:/sbin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin:/root/bin
PIPESTATUS=([0]="0")
PPID=863
PS4='+ '
PWD=/root/bugrpt
QTDIR=/usr/lib/qt-2.2.0
SESSION_MANAGER=local/localhost.localdomain:/tmp/.ICE-unix/823
SHELL=/bin/bash
SHELLOPTS=braceexpand:hashall:interactive-comments
SHLVL=4
SSH_ASKPASS=/usr/libexec/openssh/gnome-ssh-askpass
TERM=xterm
UID=0
USER=root
USERNAME=root
WINDOWID=23068796
_='[7.] Environment:'
[7.1.] Software:
-- Versions installed: (if some fields are empty or look
-- unusual then possibly you have very old versions)
Linux localhost.localdomain 2.4.2K6 #1 Mon Feb 26 18:11:39 CST 2001 i586 unknown
Kernel modules 2.4.2
Gnu C 2.96
Gnu Make 3.79.1
Binutils 2.10.0.18
Linux C Library > libc.2.2
Dynamic linker ldd (GNU libc) 2.2
Procps 2.0.7
Mount 2.10m
Net-tools 1.56
Console-tools 0.3.3
Sh-utils 2.0
Modules Loaded tulip emu10k1
[7.2.] Processor Information:
processor : 0
vendor_id : AuthenticAMD
cpu family : 5
model : 9
model name : AMD-K6(tm) 3D+ Processor
stepping : 1
cpu MHz : 451.030
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr mce cx8 pge mmx syscall 3dnow k6_mtrr
bogomips : 897.84
[7.3.] Module Information:
tulip 34192 1 (autoclean)
emu10k1 44848 1
[7.4.1.] ioports:
0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : ide1
01f0-01f7 : ide0
0376-0376 : ide1
0378-037a : parport0
03c0-03df : vga+
03f6-03f6 : ide0
03f8-03ff : serial(auto)
0cf8-0cff : PCI conf1
5000-50ff : VIA Technologies, Inc. VT82C586B ACPI
6400-641f : VIA Technologies, Inc. UHCI USB
6400-641f : usb-uhci
6800-6807 : CMD Technology Inc PCI0649
6800-6807 : ide2
6c00-6c03 : CMD Technology Inc PCI0649
6c02-6c02 : ide2
7000-7007 : CMD Technology Inc PCI0649
7000-7007 : ide3
7400-7403 : CMD Technology Inc PCI0649
7402-7402 : ide3
7800-780f : CMD Technology Inc PCI0649
7800-7807 : ide2
7808-780f : ide3
7c00-7cff : Lite-On Communications Inc LNE100TX [Linksys EtherFast 10/100]
7c00-7cff : eth0
8000-801f : Creative Labs SB Live! EMU10000
8000-801f : EMU10K1
8400-8407 : Creative Labs SB Live!
e000-efff : PCI Bus #01
e000-e0ff : 3Dfx Interactive, Inc. Voodoo 4
f000-f00f : VIA Technologies, Inc. Bus Master IDE
f000-f007 : ide0
f008-f00f : ide1
[7.4.2.] iomem:
00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000c8000-000ca5ff : Extension ROM
000f0000-000fffff : System ROM
00100000-07ffffff : System RAM
00100000-002882ab : Kernel code
002882ac-00321697 : Kernel data
a0000000-afffffff : PCI Bus #01
a0000000-a7ffffff : 3Dfx Interactive, Inc. Voodoo 4
d0000000-dfffffff : PCI Bus #01
d0000000-d7ffffff : 3Dfx Interactive, Inc. Voodoo 4
e0000000-e0ffffff : VIA Technologies, Inc. VT82C597 [Apollo VP3]
e1000000-e10000ff : Lite-On Communications Inc LNE100TX [Linksys EtherFast 10/100]
e1000000-e10000ff : eth0
ffff0000-ffffffff : reserved
[7.5.] PCI Information
00:00.0 Host bridge: VIA Technologies, Inc. VT82C598 [Apollo MVP3] (rev 04)
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=16M]
Capabilities: [a0] AGP version 1.0
Status: RQ=7 SBA+ 64bit- FW- Rate=x1,x2
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>
00:01.0 PCI bridge: VIA Technologies, Inc. VT82C598 [Apollo MVP3 AGP] (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: 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 0000e000-0000efff
Memory behind bridge: d0000000-dfffffff
Prefetchable memory behind bridge: a0000000-afffffff
BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B-
00:07.0 ISA bridge: VIA Technologies, Inc. VT82C586/A/B PCI-to-ISA [Apollo VP] (rev 47)
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
00:07.1 IDE interface: VIA Technologies, Inc. VT82C586 IDE [Apollo] (rev 06) (prog-if
8a [Master SecP PriP])
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]
00:07.2 USB Controller: VIA Technologies, Inc. VT82C586B USB (rev 02) (prog-if 00
[UHCI])
Subsystem: Unknown device 0925:1234
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, cache line size 08
Interrupt: pin D routed to IRQ 11
Region 4: I/O ports at 6400 [size=32]
00:07.3 Bridge: VIA Technologies, Inc. VT82C586B ACPI (rev 10)
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-
00:0a.0 RAID bus controller: CMD Technology Inc: Unknown device 0649 (rev 01)
Subsystem: CMD Technology Inc: Unknown device 0649
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 (500ns min, 1000ns max)
Interrupt: pin A routed to IRQ 10
Region 0: I/O ports at 6800 [size=8]
Region 1: I/O ports at 6c00 [size=4]
Region 2: I/O ports at 7000 [size=8]
Region 3: I/O ports at 7400 [size=4]
Region 4: I/O ports at 7800 [size=16]
Expansion ROM at <unassigned> [disabled] [size=512K]
Capabilities: [60] Power Management version 2
Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=3 PME-
00:0b.0 Ethernet controller: Lite-On Communications Inc LNE100TX Fast Ethernet Adapter
(rev 25)
Subsystem: Lite-On Communications Inc: Unknown device c001
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, 14000ns max), cache line size 08
Interrupt: pin A routed to IRQ 5
Region 0: I/O ports at 7c00 [size=256]
Region 1: Memory at e1000000 (32-bit, non-prefetchable) [size=256]
Expansion ROM at <unassigned> [disabled] [size=64K]
Capabilities: [44] Power Management version 1
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=220mA
PME(D0-,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
00:0c.0 Multimedia audio controller: Creative Labs SB Live! EMU10000 (rev 05)
Subsystem: Creative Labs CT4790 SoundBlaster PCI512
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 (500ns min, 5000ns max)
Interrupt: pin A routed to IRQ 3
Region 0: I/O ports at 8000 [size=32]
Capabilities: [dc] Power Management version 1
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
00:0c.1 Input device controller: Creative Labs SB Live! (rev 05)
Subsystem: Creative Labs Gameport Joystick
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: I/O ports at 8400 [size=8]
Capabilities: [dc] Power Management version 1
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
01:00.0 VGA compatible controller: 3Dfx Interactive, Inc.: Unknown device 0009 (rev
01) (prog-if 00 [VGA])
Subsystem: 3Dfx Interactive, Inc.: Unknown device 0004
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping-
SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR+
Interrupt: pin A routed to IRQ 0
Region 0: Memory at d0000000 (32-bit, non-prefetchable) [size=128M]
Region 1: Memory at a0000000 (32-bit, prefetchable) [size=128M]
Region 2: I/O ports at e000 [size=256]
Expansion ROM at <unassigned> [disabled] [size=64K]
Capabilities: [54] AGP version 2.0
Status: RQ=15 SBA+ 64bit+ FW- Rate=x1,x2
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>
Capabilities: [60] Power Management version 2
Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
[7.6.] SCSI information:
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: FUJITSU Model: M25-MCC3064AP Rev: 0051
Type: Optical Device ANSI SCSI revision: 02
[7.7.] Other information :
Feb 26 19:01:40 localhost kernel: Unable to handle kernel NULL pointer dereference at
virtual address 00000000
Feb 26 19:01:40 localhost kernel: printing eip:
Feb 26 19:01:40 localhost kernel: 00000000
Feb 26 19:01:40 localhost kernel: *pde = 00000000
Feb 26 19:01:40 localhost kernel: Oops: 0000
Feb 26 19:01:40 localhost kernel: CPU: 0
Feb 26 19:01:40 localhost kernel: EIP: 0010:[cpuid_exit+0/128]
Feb 26 19:01:40 localhost kernel: EFLAGS: 00010282
Feb 26 19:01:40 localhost kernel: eax: c030a500 ebx: c1de5200 ecx: 00000003 edx:
c1de5200
Feb 26 19:01:40 localhost kernel: esi: ffffffea edi: 00000000 ebp: 00001000 esp:
c1687f68
Feb 26 19:01:40 localhost kernel: ds: 0018 es: 0018 ss: 0018
Feb 26 19:01:40 localhost kernel: Process cp (pid: 888, stackpage=c1687000)
Feb 26 19:01:40 localhost kernel: Stack: c0162966 c1de5200 bfffe4a8 00001000 c1de5220
c0131828 c1de5200 bfffe4a8
Feb 26 19:01:40 localhost kernel: 00001000 c1de5220 00000000 0000000c 00000000
c267ec20 bffff4d8 00000000
Feb 26 19:01:40 localhost kernel: c1de5200 bffff4a0 c1686000 00001000 bfffe4a8
bffff550 c0108fc3 00000003
Feb 26 19:01:40 localhost kernel: Call Trace: [fat_file_read+38/48] [sys_read+152/208]
[system_call+51/64]
Feb 26 19:01:40 localhost kernel:
Feb 26 19:01:40 localhost kernel: Code: Bad EIP value.
[8.0] My fix (based on 2.4.2):
patch starts ------>>>
--- /root/linux-2.4.2/fs/fat/file.c Wed Apr 12 11:47:29 2000
+++ linux/fs/fat/file.c Mon Feb 26 20:02:26 2001
@@ -49,8 +49,19 @@
loff_t *ppos)
{
struct inode *inode = filp->f_dentry->d_inode;
- return MSDOS_SB(inode->i_sb)->cvf_format
- ->cvf_file_read(filp,buf,count,ppos);
+
+ if (MSDOS_SB(inode->i_sb)->cvf_format &&
+ MSDOS_SB(inode->i_sb)->cvf_format->cvf_file_read)
+ return MSDOS_SB(inode->i_sb)->cvf_format
+ ->cvf_file_read(filp,buf,count,ppos);
+
+ /*
+ * MS-DOS filesystems with a blocksize > 512 may have blocks
+ * spread over several hardware sectors (unaligned), which
+ * is not something the generic routines can (or would want
+ * to) handle).
+ */
+ return generic_file_read(filp, buf, count, ppos);
}
<<<------patch ends
-
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