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double free or corruption error during yosys abc9 techmap pass #84

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@gsomlo

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@gsomlo

See yosys-abc-test.tgz. Reproduce with:

tar xfz yosys-abc-test.tgz
cd yosys-abc-test
abc -s -f ./abc.script

Program fails with:

+ &write -n ./output.aig 
Error: Gia_ManMappingVerify: Internal node -1 does not have mapping.
+ time 
elapse: 53.38 seconds, total: 53.38 seconds
double free or corruption (out)
Aborted (core dumped)

Any idea as to what might be going wrong much appreciated!

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