On 05/10/2017 12:16 PM, Ralph Stirling wrote:
> 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.
Looks like you built linuxcnc from source and configured
--with-realtime=uspace instead of
--with-realtime=/usr/realtime-3.4-9-rtai-686-pae.
I'm able to reproduce the "no attribute 'kernel_version'" by configuring
for uspace, but I don't have a 7i43 hooked up at the moment and without
it I'm not able to reproduce the crash.
> 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?
Our 3.4-9-rtai-686-pae RTAI kernel has the normal Linux PREEMPT feature
enabled (this is different than the RT-PREEMPT feature, and not as
realtimey), in addition to the RTAI feature.
--
Sebastian Kuzminsky
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
