I must admit that the condition in question is fairly long and non-trivial and I cannot decipher it, but these two lines look wrong to me:
(t->inp_flags2 & INP_REUSEPORT) || (t->inp_flags2 & INP_REUSEPORT_LB) == 0) &&I'd expect that the check would be symmetric with respect to INP_REUSEPORT and INP_REUSEPORT_LB.
The problem seems to come from 1a43cff92a20d / r334719 / D11003. -- Andriy Gapon