Use Error-Unable to query solver: Connection timed out

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As described in title, I build and use souper according to README.md, but it doesn't work.

Actually, it works in usage like '/path/to/souper-build path/to/example.bc' with static profile count. However, when I use it like '/path/to/souper-build path/to/example.bc -souper-use-cegis', meaning that I want it to perform optimization, I get output like this :

; Listing valid replacements.
; Using solver: Z3 + internal cache
Unable to query solver: Connection timed out

I try to use '-solver-timeout=60' and '--souper-internal-cache=false', and it still gets 'Unable to query solver'.

I even recover the command line param support of '-z3-path' according to commit for passing it the absolute path of z3, and it still gets 'Unable to query solver'.

May you help me to find out the problem indeed and the solution to it?

[16061054]

@regehr @zhengyang92 @manasij7479