For example while building the kernel under bash-ll I got:
add_thread_group:Cannot move process 416250 (cc1) - partially shared with process 2 (child_reaper)
It always seems to think processes are shared with process 2, the child reaper.
I attach a silly test script that usually causes the problem:
$ sh ./zz-migrate-cruelty
./zz-migrate-cruelty: line 1: echo: write error: Invalid argument
406451 migration from 6 failed want 1
$ dmesg | tail
add_thread_group:Cannot move process 406451 (sh) - partially shared with process 2 (child_reaper)
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