Bird 2.0.8 + uClibc-ng, BGP RR + OSPF - OSPF falls to 'Alone' state at BGP routes recalculation

[Andrew]

Hi all.

I have Bird 2.0.8 on one of border routers, it runs with kernel 5.10.26 
and uClibc-ng 1.0.38. It acts as RR and receives FV from uplink + FV 
from second border (also RR), and it has 2 routing tables (one which 
receives BGP routes, then routes sinks to main table.

When second border's BGP link fails, Bird starts to rebuild routing 
table, and acts quite strange (too slow birdc response, etc) and after 
~5 minutes OSPF looses neighbors and falls to state 'Alone'. It can be 
in that state for hours, and initiated only after bird restart (I didn't 
tried protocol restart - usually I don't wait for end of route table 
recalculation).

When table recalculation is in progress, perf top shows that 40+% CPU 
time is used by malloc routine.

Are there fixes in trunk for such behavior? If no - what extra info is 
needed for debugging?