How to troubleshot: IpcThreadState log spam / system_server eating battery

The last days, i encounter the issue of my phone draining its battery fast (about 10-15%/h when idle).

I'm trying to see what's happening, there are no unusual or suspicious alarms or wake locks.

system_server has took a large slate of the phones cpu processing time (according to BetterBatteryStats), it isn't entering deep sleep.

According to logcat that doesn't wonder me - every 50ms a lot of [E] error log lines are logged.

they are

*tr[0]=value1: value2,
*tr[1]=value1: value2,
...
*tr[9]=value1: value2,
*mIn.mData[2]=value1: value2
...
*mIn.mData[11]=value1: value2,

i suspect value1 to be pointer adresses, and value2 to be values - value2 does match between most of the logged lines, and also between tr and mData (so tr[0].value2 == mIn.mData[2].value2 )

i know that IpcThreadState is related to the android binder ipc mechanism, but i don't really find something logging out lines like that in the repositories i've found.

Ah: Could be related: my phone is a SM-G850F Build KTU84P.G850FXXU2BNK3 Stock Firmware, rooted.

And the Question I've got is: how can i find out what is causing this extensive spam (i guess the binder is going circles due to some misbehaving application?), without doing a factory reset and reinstalling applications one by one...