### What this PR does / why we need it?
A problem of the d node getting stuck in the pd-separation scenario is
solved.
We find it will crash at `torch.nn.functional.linear(x, weight, bias)`
after being stuck for a long time.
we found that the shapes of each dp
node were not aligned. this is the root cause.
- vLLM version: v0.18.0
- vLLM main:
4034c3d32e
Signed-off-by: drslark <slarksblood@qq.com>