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Removing SDCARD results in segmentation fault

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segfault:
Is there anyone out there who has any idea on what to do if I want to be able to run firefox (or chromium) without a SDCARD in the device, without the browser crashing?

So far I tried
First I start firefox, then I physically remove the SDCARD, then firefox crashes (only happens if SDCARD is removed and 100% reproducible). The error output reads "Segmentation fault".

I run "ps", then run "fuser -m /dev/mmcblk0p2" and see that firefox is using /mnt/mmcblk0p2. I try "umount -f /dev/mmcblk0p2" buy get a device busy error.

I then add firefox to copy2fs.lst and noswap to config, but firefox still crashes if I remove the SDCARD.

I then run "sudo umount -a" and now /dev/mmcblk0p2 gets unmounted. But firefox will crash after a while. This time it will take longer time (still measured in minutes) before it crashes, but it will crash eventually.

If I haven't started Firefox I can not start it after having un-mounted mmcblk0p2, but if I have started it, it seems to be still in RAM because I can restart it again after the crash, but will eventually crash never the less.

Rich:
Hi segfault
Welcome to the forum.

See if replacing copy2fs.lst with an empty file called copy2fs.flg fixes it.

segfault:
Thanks for the welcome and ur comment Rich!  ;D

I did "cd /mnt/mmcblk0p2/tce && rm copy2fs.lst && touch copy2fs.lst && sudo reboot".
Now loading extensions takes considerably longer time and eventually I get error: cp: write error: No space left on device.

I'm doing this on a Raspberry Pi 2 B v 1.1, so maybe not such surprising result. I've got basically the default version of piCore and save for Vim I've not downloaded any other extensions then firefox.

Is there something else I could try?
Maybe I could specify the dependencies the browser is using and add those to the copy2fs.lst list file?
I'm not sure which these are, but I think it at least lists some extensions it needs to download in order to run (it could still be using some other extensions already pre-downloaded though).

Any ideas?

PS! First impression of tinycore is great :)... very cool to be able to mess around and learn the ins- and out and not having to worry about permanently damaging the OS... just reboot. Really nice!!!

EDIT: Just noticed that the Apps app has a tab for all the dependencies.
EDIT2: And in optional folder I found firefox.tcz.dep file... but only the whole tree is not listed. But using tce-ab I can navigate in the terminal and look at the dependency tree. I will copy these to copy2fs.lst and see what happens.

Rich:
Hi segfault
You can't have it both ways. If you want to be able to remove the card, any
extension and its dependencies that get loaded must be copied to RAM.


--- Quote from: segfault on July 07, 2024, 01:09:25 PM --- ... Now loading extensions takes considerably longer time and ...
--- End quote ---
It takes longer to copy extensions to RAM than to simply loop mount them.


--- Quote --- ... Is there something else I could try?
Maybe I could specify the dependencies the browser is using and add those to the copy2fs.lst list file? ...
--- End quote ---
Eventually something will attempt to access some other extension you're
loading and you'll segfault again.
If you need to pull the SD card, and you are short on RAM, I suggest
removing any extensions you don't need from  onboot.lst  so they
don't get loaded.

patrikg:
 No space left on device.
Did you forget to expand the partision.
Or is it you memory size to small.

http://tinycorelinux.net/6.x/armv6/releases/README

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