hzeller/beagleg

Alignment trap: not handling instruction f843ec10 at [<00014c9a>]

mikikg opened this issue · 5 comments

mikikg commented

Hi,

I have tried latest BeagleG code on xenomai-r79 (machinekit) but have some problems.
It is clear GIT checkout with all defaults.

If I run ./machine-control -p 3000 --nohoming-required -c sample.config after several G-code commands something goes bad, got following in console:

INFO  [2016-06-30 17:21:06.049176] Accepting new connection from 192.168.0.230
Bus error

G-codes transaction looks like this in terminal:

telnet beaglebone-02 3000
Trying 192.168.0.6...
Connected to beaglebone-02.
Escape character is '^]'.
G01 F10 X100 M114 M114
ok
X:0.000 Y:0.000 Z:0.000 E:0.000 [ABS. MACHINE CUBE X:0.000 Y:0.000 Z:0.000] (Unsure: machine never homed!)
ok
X:0.000 Y:0.000 Z:0.000 E:0.000 [ABS. MACHINE CUBE X:0.000 Y:0.000 Z:0.000] (Unsure: machine never homed!)
ok
M114
X:100.003 Y:0.000 Z:0.000 E:0.000 [ABS. MACHINE CUBE X:100.003 Y:0.000 Z:0.000] (Unsure: machine never homed!)
ok
G01 X1 M114 M114
ok
X:100.003 Y:0.000 Z:0.000 E:0.000 [ABS. MACHINE CUBE X:100.003 Y:0.000 Z:0.000] (Unsure: machine never homed!)
ok
X:100.003 Y:0.000 Z:0.000 E:0.000 [ABS. MACHINE CUBE X:100.003 Y:0.000 Z:0.000] (Unsure: machine never homed!)
ok
Connection closed by foreign host.

In syslog I only get this:

Jun 30 17:21:51 beaglebone-02 kernel: [ 1643.269886] Alignment trap: not handling instruction f843ec10 at [<00014c9a>]
Jun 30 17:21:51 beaglebone-02 kernel: [ 1643.277375] Unhandled fault: alignment exception (0x801) at 0xb6c88036

Any clue what can be wrong here?

hzeller commented

are you using the latest 4.4 Linux kernel by any chance?
On Jun 30, 2016 10:33 AM, "Aleksandar Marković" notifications@github.com
wrote:

Hi,

I have tried latest BeagleG code on xenomai-r79 (machinekit) but have some
problems.
It is clear GIT checkout with all defaults.

If I run ./machine-control -p 3000 --nohoming-required -c sample.config
after several G-code commands something goes bad, got following in console:

INFO [2016-06-30 17:21:06.049176] Accepting new connection from 192.168.0.230
Bus error

G-codes transaction looks like this in terminal:

telnet beaglebone-02 3000
Trying 192.168.0.6...
Connected to beaglebone-02.
Escape character is '^]'.
G01 F10 X100 M114 M114
ok
X:0.000 Y:0.000 Z:0.000 E:0.000 [ABS. MACHINE CUBE X:0.000 Y:0.000 Z:0.000](Unsure: machine never homed!)
ok
X:0.000 Y:0.000 Z:0.000 E:0.000 [ABS. MACHINE CUBE X:0.000 Y:0.000 Z:0.000](Unsure: machine never homed!)
ok
M114
X:100.003 Y:0.000 Z:0.000 E:0.000 [ABS. MACHINE CUBE X:100.003 Y:0.000 Z:0.000](Unsure: machine never homed!)
ok
G01 X1 M114 M114
ok
X:100.003 Y:0.000 Z:0.000 E:0.000 [ABS. MACHINE CUBE X:100.003 Y:0.000 Z:0.000](Unsure: machine never homed!)
ok
X:100.003 Y:0.000 Z:0.000 E:0.000 [ABS. MACHINE CUBE X:100.003 Y:0.000 Z:0.000](Unsure: machine never homed!)
ok
Connection closed by foreign host.

In syslog I only get this:

Jun 30 17:21:51 beaglebone-02 kernel: [ 1643.269886] Alignment trap: not handling instruction f843ec10 at [<00014c9a>]
Jun 30 17:21:51 beaglebone-02 kernel: [ 1643.277375] Unhandled fault: alignment exception (0x801) at 0xb6c88036

Any clue what can be wrong here?

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mikikg commented

No, 3.8.13

uname -a
3.8.13-xenomai-r79 #1 Wed Jun 15 22:12:09 UTC 2016 armv7l GNU/Linux
hzeller commented

There was some alignment problem that showed up in newer kernels. Leonardo has a first patch for this, see #12 - can you try if that works for you ?
(it will not be the final solution, but worth a try)

mikikg commented

With leonardo's patch seams to work, no more Bus error.

hzeller commented

Ok cool. I'll try to dig into the exact details what the alignment requirements are.