[Interest] Android 11, memory leak and Scudo

[maitai]

Hi all,

I have several users crashing with OOM under Android 11 or 12 (qt5.15.8 
Widget app, SDK30, NDK21, JDK11). The same exact config (same apk, same 
settings, same data) does not behave the same depending on the device 
using SCUDO or JEMALLOC. I have a device running Android 11 but with 
JEMALLOC, no memory leak on that one, while the same automated test 
sequence is crashing on Android 11 using SCUDO.

As far as I can see from the logs, memory is never released by the OS 
and of course after reaching a threshold app is getting killed. I am 
100% sure there is no memory leak on our side, and the amount of memory 
we use never exceeds 3G even on very strong devices with 12G or more 
total memory.

I have tried a lot of things, including calling regularly System.gc() or 
setting some obscure parameters using __scudo_default_options() with no 
result: memory always increase whatever I delete. I have also tried 
building against SDK31.

So my questions are: is there a known issue with qt and scudo on Android 
11 or 12 and what should/can I do about that? Any idea how to better 
understand/debug the issue?

Thanks
Philippe Lelong
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