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SubjectMachine lockup bug report.

I have a bug to report. Here it is:
Gary =)

[1.] One line summary of the problem:

Complete machine lockup when trying to dd a CD image to a local
hard drive.

[2.] Full description of the problem/report:

When using the command `dd if=/dev/cdrom of=local/images/image.iso`
within my home directory, the machine locked up. X was still
displayed, but unresponsive. Virtual consoles not working,
couldn't telnet into machine (over ethernet) or even ping it.
Even the magic sysrq key didn't work (tried to sync/umount the

When issuing the command from a virtual console, the message:
`hdb: Timeout waiting for DMA' is displayed as the machine locks.

I managed to get identical crashes about six times, all just after
a reboot.

I am able to mount and read this particular CD, and have
done inbetween crashes. After mounting and umounting the CD, I
was able to dd the image from it. I have dd'd images from
different CD's before (on the same kernel and hardware). However,
I managed to get the same crash by mounting the CD.

All these actions were performed under a user account (not root).

My home directory is mounted over NFS from another Linux box;
the directory `local' in my home directory is a symlink to a
partition on my local hard drive.

The CDROM is a Toshiba IDE drive, as slave. It is the only ide
device in the system.

[3.] Keywords (i.e., modules, networking, kernel):


[4.] Kernel version (from /proc/version):

Linux version 2.2.13 (root@eepc-pss3) (gcc version egcs-2.91.66
19990314/Linux (egcs-1.1.2 release)) #5 SMP Tue Nov 2 17:11:10 GMT 1999

[5.] Output of Oops.. message (if applicable) with symbolic information
resolved (see Documentation/oops-tracing.txt)


[6.] A small shell script or example program which triggers the
problem (if possible)


[7.] Environment

[7.1.] Software (add the output of the ver_linux script here)

-- Versions installed: (if some fields are empty or looks
-- unusual then possibly you have very old versions)
Linux eepc-pss3 2.2.13 #5 SMP Tue Nov 2 17:11:10 GMT 1999 i686 unknown
Kernel modules 2.1.121
Gnu C egcs-2.91.66
Linux C Library*
Dynamic linker ldd (GNU libc) 2.1.2
Procps 2.0.4
Mount 2.9u
Net-tools 1.53
Console-tools 1999.03.02
Sh-utils 2.0
Sh-utils Parker.
Sh-utils Inc.
Sh-utils NO
Sh-utils PURPOSE.
cat: /proc/modules: No such file or directory
Modules Loaded

[7.2.] Processor information (from /proc/cpuinfo):

processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 1
model name : AMD-K7(tm) Processor
stepping : 2
cpu MHz : 648.752790
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
sep_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 6 mce cx8 sep mtrr pge 14 cmov
fcmov 22 mmx 30 3dnow
bogomips : 647.17

[7.3.] Module information (from /proc/modules):

Not running a modular kernel.

[7.4.] SCSI information (from /proc/scsi/scsi)

Attached devices:
Host: scsi0 Channel: 00 Id: 01 Lun: 00
Vendor: QUANTUM Model: ATLAS IV 18 WLS Rev: 0808
Type: Direct-Access ANSI SCSI revision: 03

Card is an Adaptec AHA2940UW, which has been in use for several
years with no problems.

[7.5.] Other information that might be relevant to the problem
(please look in /proc and include all information that you
think to be relevant):

Kernel has been running constantly for 6 days with no problems.
Only difference between my 2.2.12 configuration and my 2.2.13
configuration is that I included ntfs.

[X.] Other notes, patches, fixes, workarounds:


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