Klipper shutdown during the START routine of a print

[oschir]

Request a temperature tower from orcaslicer.
Move it to approx 5cm of the front border of the plate.
Start the print and Klipper shuts down in error "unhandled exception".
Klipper restart or firmware restart is useless, need to reboot the raspberry.

Moving the temperature tower to approx 10cm of the front border of the plate solves the issue.

Looking at the log:
Unhandled exception during run
Traceback (most recent call last):
File "/home/pi/klipper/klippy/klippy.py", line 176, in run
self.reactor.run()
File "/home/pi/klipper/klippy/reactor.py", line 292, in run
g_next.switch()
File "/home/pi/klipper/klippy/reactor.py", line 340, in _dispatch_loop
timeout = self._check_timers(eventtime, busy)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/pi/klipper/klippy/reactor.py", line 158, in _check_timers
t.waketime = waketime = t.callback(eventtime)
^^^^^^^^^^^^^^^^^^^^^
File "/home/pi/klipper/klippy/reactor.py", line 48, in invoke
res = self.callback(eventtime)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/pi/klipper/klippy/extras/scanner.py", line 1916, in
self.reactor.register_async_callback(lambda e: self._stream_flush())
^^^^^^^^^^^^^^^^^^^^
File "/home/pi/klipper/klippy/extras/scanner.py", line 1893, in _stream_flush
cb(sample)
File "/home/pi/klipper/klippy/extras/scanner.py", line 2799, in _handle
self.cb(sample)
File "/home/pi/klipper/klippy/extras/scanner.py", line 3545, in cb
yi = int(round((y - min_y) / self.step_y))
~~~~~~~~~~^~~~~~~~~~~~~~~
ZeroDivisionError: float division by zero
Transition to shutdown state: Unhandled exception during run

Using:
Klipper v0.12.0-486-g050bc332 -> v0.13.0-181
cartographer v1.2.0-0-g7e354f3b
Klipper-Adaptive-Meshing-Purging v1.1.2-13-gb0dad8ec

[bufeng-12]

您好！我已收到你的邮件！谢谢！          ——曾君

[oschir]

klippy(2).log

[oschir]

Some more degug...
In class ScannerMeshHelper:calibrate(self, gcmd: GCodeCommand):
step_x: 11
step_y: 0
max_x: 247
min_x: 167
res_x: 8
max_y: 66
min_y: 66
res_y: 4

In class ScannerMeshHelper:_sample_mesh(self, gcmd: GCodeCommand, path, speed, runs):
x: 167
y: 66
min_x: 167
min_y: 66
step_x: 11
step_y: 0

max_y = min_y hence the division by 0

[oschir]

Tried to get around the problem with the following code:

class ScannerMeshHelper:_sample_mesh(self, gcmd: GCodeCommand, path, speed, runs):
...
# Calculate coordinate of the cluster we are in
xi = -1
yi = -1
if self.step_x != 0:
xi = int(round((x - min_x) / self.step_x))
if self.step_y != 0:
yi = int(round((y - min_y) / self.step_y))
if xi < 0 or self.res_x <= xi or yi < 0 or self.res_y <= yi:
return

but now the exception is in the Bedmesh.py extra:

     File "/home/pi/klipper/klippy/extras/bed_mesh.py", line 1469, in _get_linear_index
      idx = int(math.floor((coord - mesh_min) / mesh_dist))
                     ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
    ZeroDivisionError: float division by zero

Might be more Klipper or KAMP bug rather than a scanner bug

[oschir]

klippy.zip