CPU lockup due to buffer overrun

[ekwok117]

Hello-

I'm running a PCAN-PCIe FD card on a 14.04 Ubuntu system. Been having cpu lockups and saw this [attached] message. Any insight as to how this happens?

Screen Shot 2020-06-03 at 4.00.18 PM.png (1.77 MiB) Viewed 5202 times

[S.Grosjean]

Hi,

Are you sure that your CAN device is correctly setup? The pcan driver might be verbose if you don't setup the correct bitrate, or if you're alone on the bus (that is, if no other equipment does ack the frame you write). Are you using terminated cables?

Which version of the driver do you run, please?

Regards,

[ekwok117]

Thanks for the response. Driver is 8.9.0 and we are using terminated cables. Have not seen this issue until recently after running it daily for the last year or so.

[S.Grosjean]

Hi,

Ok. FYI we've recently released v8.10.1 of the driver.

Anyway, we could first remove this trace in order to prevent any further lockups of the Kernel and so, to facilitate debugging. Please go back into the driver sources tree:

Code: Select all

$ cd peak-linux-driver-8.9.0/driver

Then edit src/pcanfd_pci.c and change line:

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#define DEBUG_CRITICAL

into:

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//#define DEBUG_CRITICAL

then save the file, rebuild and reinstall the new driver:

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$ make
$ sudo make install

Once running this new version, please give us the output of:

Code: Select all

$ cat /proc/pcan
$ dmesg | grep pcan

Regards,