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Linux - Embedded & Single-board computer This forum is for the discussion of Linux on both embedded devices and single-board computers (such as the Raspberry Pi, BeagleBoard and PandaBoard). Discussions involving Arduino, plug computers and other micro-controller like devices are also welcome.

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Old 01-08-2018, 12:00 AM   #1
OkCalis
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Registered: Dec 2017
Posts: 20

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Unhappy NFS started to malfunction all of a sudden; "shutdown" throws segmentation fault


Hi,
I've been using a MityDsp-L138F SoM (featuring TI's OMAPL138 processor) with NFS. My host PC has a virtual machine with Ubuntu 16.04 installed, and I've been exporting a directory as NFS to the device without issues.

Last week, either the kernel or the file system started behaving unexpectedly, so I deleted the file system from the host side, and restarted with an untouched version supplied by the manufacturer.

However, since then, things have become even messier. When I login as "root" on the device, the terminal prints "@mityomapl138:/home/root#" (it used to be something like "root@mityomapl138:~#").

And I can't issue commands like "shutdown" or "reboot", either; doing so throws a segmentation fault error.

I have no idea what I did wrong. Have any of you guys encountered such a problem?

Thanks in advance.
OkCalis

Edit: I'm now sure that the issue stems from the Ubuntu host, not the embedded device, as it works as expected on another NFS server computer. But I don't know how I can fix it.

Last edited by OkCalis; 01-08-2018 at 01:42 AM. Reason: Adding extra information
 
Old 01-08-2018, 04:01 AM   #2
OkCalis
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Registered: Dec 2017
Posts: 20

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Rep: Reputation: Disabled
As I suspected, the host side was causing the problem. Somehow, the permissions of the root file system directory in /export were reset.
Code:
sudo chmod -R 777 /export/rootfs
This solved the problem. I don't know if the -R (recursive) option is necessary, though.
 
  


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