gdb on IBM Walnut board panics the kernel

Frank Rowand frank_rowand at
Sat Feb 3 09:42:49 EST 2001

"Curry, Diane" wrote:
> I'm running Monta Vista's Hard Hat Linux (11/26/200 2.4.0-test2) on an
> IBM 405GP walnut rev D board. On an x86 PC running Red Hat Linux 7.0,
> using MV's CDK, I built a small program using ppc_4xx-gcc with the -g
> switch.
> The executable is in /tmp of the root filesystem
> (/opt/hardhat/devkit/ppc/4xx/target)
> that is exported for the target linux to nfs mount. The program, when
> run by itself, runs fine.  However, when running gdb on the program, the
> kernel panics (explicitly setting
> breakpoints produces the same result).
> Has anyone observed similar behavior or recognize the possible cause?
> Any suggestions would be greatly appreciated.
> Diane Curry
> Infiniswitch Corp.
> dcurry at

Yes, this is a known problem.  (It's described in the README file in the
top directory of the CDK.)  The problem is that ptrace is not yet
implemented for the 4xx processors.  I have ptrace working in an old
version of the kernel, but haven't yet moved it forward to a current
kernel and cleaned up the implementation.  This is a very high priority
item for completion.

Frank Rowand <frank_rowand at>
MontaVista Software, Inc

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