# shibo - @Seve a summary of why the fanout test ...

Channel: #contributor
Source: https://discord.com/channels/1233487248129921135/1546972284936388739
Started: 2026-09-08T19:55:35.117000+00:00
Last activity: 2026-09-08T21:59:58.683000+00:00

## shibo — 2026-09-08T19:55:34.084000+00:00

<@757706909351411845> a summary of why the fanout test in core is failing:
1 - Core gives the solver incomplete input.
The decoupling vias aren’t present when fanout runs. The solver correctly routes through that apparently empty space.

2 - Then another issue with the vias included, the solver’s search strategy was inadequate.
It respected the obstacles—it didn’t route through them—but chose routes/reservations in an order that trapped a later DDR bus and failed to find the valid solution.

a proposed fix: https://github.com/tscircuit/fanout-solver/pull/192 to the fanout solver issue which will be followed by a fix to core

## Seve — 2026-09-08T21:59:55.499000+00:00

merged

## Seve — 2026-09-08T21:59:58.683000+00:00

sorry for the delay