I have compiled 2.8.0-pre1 from source for a non-trivkins
project. I am using a Mesa 7I43 board. When I run linuxcnc
with software stepgens (no hostmot2), all is well. If I create
a plain-vanilla Mesa-based stepper configuration with pncconf,
the computer crashes during startup of linuxcnc and requires
power cycling.
Kernel: 3.4-9-rtai-686-pae
Distro: Debian 7.11 (wheezy)
If I do a "test axis" during pncconf, I get this error:
Traceback (most recent call last):
File "/home/engrtech/linuxcnc-dev/lib/python/pncconf/pages.py", line 1129, in
on_zaxistune_clicked
def on_zaxistune_clicked(self, *args): self.t.tune_axis('z')
File "/home/engrtech/linuxcnc-dev/lib/python/pncconf/tests.py", line 463, in t
une_axis
if not self.a.check_for_rt():
File "/home/engrtech/linuxcnc-dev/bin/pncconf", line 1640, in check_for_rt
elif hal.is_rt and not hal.kernel_version == actual_kernel:
AttributeError: 'module' object has no attribute 'kernel_version'
When I actually run linuxcnc from the configuration made by pncconf,
I get a kernel panic:
BUG: unable to handle kernel NULL pointer dereference at 00000508
IP: [<f91e6328>] handle_lxrt_request+0x58/0xaf0 [rtai_sched]
*pde = 00000000
Oops: 0000 [#1] PREEMPT SMP
followed by more stack trace stuff.
Linux 2.7.8 with hostmot2 runs fine, as does 2.8.0-pre1 with software stepgen.
Is this a problem of my making (and hence my solving), or is it a bug? I'm
wondering why I see mention of PREEMPT in the kernel panic when I am
running an RTAI kernel. Do I need to compile 2.8.0-pre1 differently?
Thanks,
-- Ralph
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