OOM kill results in failure of createTarFork() when running adb backup --twrp

[happysmash27]

OOM kill results in failure of createTarFork() when running adb backup --twrp

[bigbiff]

Does this happen on backups using the TWRP menu interface?

[happysmash27]

I can't back up using the TWRP menu interface (to my knowledge), as I would quickly run out of space in my internal storage, and the function to mount an external disk over USB OTG does not work. I am backing up over 20GB worth of files and only have a /sdcard with 2.6GB free.

[wombatch]

I have exactly the same problem, sadly slightly older software TWRP 3.2.3 on a Sony Z5C. As for you it all used to work fine on my phone, I have to admit I didn't take a back up for a while and now I can't.
My perception is (maybe didn't dig as far as you) is that something is stopping TWRP from creating the split archive, each archive file ( data.ext4.winXXX) as far as I can see should get to about 1.5GB before creating a new one, on my system a single data archive gets to about 2.2GB and then the processes all get cancelled.
It's very frustrating, I get the same effect from the GUI and by running from ADB

[happysmash27]

Since it seemed to be an OOM error and there was no swap file:

~ # free -m
             total         used         free       shared      buffers
Mem:       2949976      1772168      1177808            0       383332
-/+ buffers:            1388836      1561140
Swap:            0            0            0

I decided to create my own swap file:

~ # dd if=/dev/zero of=/sdcard/swapfile bs=4M count=256
256+0 records in
256+0 records out
1073741824 bytes (1.0GB) copied, 52.261909 seconds, 19.6MB/s
~ # mkswap /sdcard/swapfile
Setting up swapspace version 1, size = 1073737728 bytes

However, apparently the swapon command is broken =(-_-)= :

~ # swapon /sdcard/swapfile
swapon: /sdcard/swapfile: Function not implemented

Or maybe, hopefully, I just did something wrong and this can be fixed.

[happysmash27]

I think I'm going to need to recompile the kernel for this: https://www.acmesystems.it/ts_swapon_failed

Um... anyone know some good documentation on that for whatever kernel TWRP uses?

At this rate, though, I'm probably going to get an error when trying to do that too...