dune-build unix domain socket exception

gistfile1.txt

# Workspace root: /home/user/src/dune-usock-issue
Running[0]: /usr/bin/nproc > /tmp/dune91afe0.output 2> /dev/null
# Auto-detected concurrency: 2
# disable binary cache
Running[1]: /home/user/.opam/4.09.0/bin/ocamlc.opt -config > /tmp/duned555f5.output
# Dune context:
#  { name = "default"
#  ; kind = "default"
#  ; profile = Dyn
#  ; merlin = true
#  ; for_host = None
#  ; fdo_target_exe = None
#  ; build_dir = "default"
#  ; toplevel_path = Some External "/home/user/.opam/4.09.0/lib/toplevel"
#  ; ocaml_bin = External "/home/user/.opam/4.09.0/bin"
#  ; ocaml = External "/home/user/.opam/4.09.0/bin/ocaml"
#  ; ocamlc = External "/home/user/.opam/4.09.0/bin/ocamlc.opt"
#  ; ocamlopt = Some External "/home/user/.opam/4.09.0/bin/ocamlopt.opt"
#  ; ocamldep = External "/home/user/.opam/4.09.0/bin/ocamldep.opt"
#  ; ocamlmklib = External "/home/user/.opam/4.09.0/bin/ocamlmklib.opt"
#  ;
#  env =
#    map
#      { "DUNE_CONFIGURATOR" : "/home/user/.opam/4.09.0/bin/ocamlc.opt"
#      ; "INSIDE_DUNE" : "1"
#      ;
#      "OCAMLFIND_IGNORE_DUPS_IN" :
#        "/home/user/src/dune-usock-issue/_build/install/default/lib"
#      ;
#      "OCAMLPATH" :
#        "/home/user/src/dune-usock-issue/_build/install/default/lib"
#      ; "OCAML_COLOR" : "always"
#      ; "OPAMCOLOR" : "always"
#      }
#  ; findlib_path = [ External "/home/user/.opam/4.09.0/lib" ]
#  ; arch_sixtyfour = true
#  ; natdynlink_supported = true
#  ; supports_shared_libraries = true
#  ; opam_vars = map {}
#  ;
#  ocaml_config =
#    { version = "4.09.0"
#    ; standard_library_default = "/home/user/.opam/4.09.0/lib/ocaml"
#    ; standard_library = "/home/user/.opam/4.09.0/lib/ocaml"
#    ; standard_runtime = "the_standard_runtime_variable_was_deleted"
#    ; ccomp_type = "cc"
#    ; c_compiler = "gcc"
#    ; ocamlc_cflags = [ "-O2"; "-fno-strict-aliasing"; "-fwrapv"; "-fPIC" ]
#    ; ocamlopt_cflags = [ "-O2"; "-fno-strict-aliasing"; "-fwrapv" ]
#    ;
#    bytecomp_c_compiler =
#      [ "gcc"
#      ; "-O2"
#      ; "-fno-strict-aliasing"
#      ; "-fwrapv"
#      ; "-fPIC"
#      ; "-D_FILE_OFFSET_BITS=64"
#      ; "-D_REENTRANT"
#      ]
#    ; bytecomp_c_libraries = [ "-lm"; "-ldl"; "-lpthread" ]
#    ;
#    native_c_compiler =
#      [ "gcc"
#      ; "-O2"
#      ; "-fno-strict-aliasing"
#      ; "-fwrapv"
#      ; "-D_FILE_OFFSET_BITS=64"
#      ; "-D_REENTRANT"
#      ]
#    ; native_c_libraries = [ "-lm"; "-ldl" ]
#    ; cc_profile = []
#    ; architecture = "amd64"
#    ; model = "default"
#    ; int_size = 63
#    ; word_size = 64
#    ; system = "linux"
#    ; asm = [ "as" ]
#    ; asm_cfi_supported = true
#    ; with_frame_pointers = false
#    ; ext_exe = ""
#    ; ext_obj = ".o"
#    ; ext_asm = ".s"
#    ; ext_lib = ".a"
#    ; ext_dll = ".so"
#    ; os_type = "Unix"
#    ; default_executable_name = "a.out"
#    ; systhread_supported = true
#    ; host = "x86_64-pc-linux-gnu"
#    ; target = "x86_64-pc-linux-gnu"
#    ; profiling = false
#    ; flambda = false
#    ; spacetime = false
#    ; safe_string = false
#    ; exec_magic_number = "Caml1999X026"
#    ; cmi_magic_number = "Caml1999I026"
#    ; cmo_magic_number = "Caml1999O026"
#    ; cma_magic_number = "Caml1999A026"
#    ; cmx_magic_number = "Caml1999Y026"
#    ; cmxa_magic_number = "Caml1999Z026"
#    ; ast_impl_magic_number = "Caml1999M026"
#    ; ast_intf_magic_number = "Caml1999N026"
#    ; cmxs_magic_number = "Caml1999D026"
#    ; cmt_magic_number = "Caml1999T026"
#    ; natdynlink_supported = true
#    ; supports_shared_libraries = true
#    ; windows_unicode = false
#    }
#  ;
#  which =
#    map
#      { "ocaml" : Some External "/home/user/.opam/4.09.0/bin/ocaml"
#      ; "ocamlc" : Some External "/home/user/.opam/4.09.0/bin/ocamlc.opt"
#      ;
#      "ocamlobjinfo" :
#        Some External "/home/user/.opam/4.09.0/bin/ocamlobjinfo.opt"
#      }
#  }
# Actual targets:
# - alias @@./default
Error: exception Sys_error("fail.sock: No such device or address")
Backtrace:
Raised by primitive operation at file "stdlib.ml", line 398, characters 28-54
Called from file "stdlib.ml" (inlined), line 406, characters 2-47
Called from file "digest.ml", line 39, characters 11-31
Called from file "src/stdune/digest.ml" (inlined), line 14, characters 13-38
Called from file "src/stdune/digest.ml", line 42, characters 13-19
Called from file "src/dune/cached_digest.ml", line 95, characters 15-45
Called from file "src/dune/cached_digest.ml" (inlined), line 131, characters 12-22
Called from file "src/dune/dep.ml", line 57, characters 42-63
Called from file "src/dune/dep.ml", line 62, characters 28-43
Called from file "src/stdune/list.ml", line 19, characters 12-15
Called from file "src/dune/dep.ml", line 133, characters 6-74
Called from file "src/dune/build_system.ml", line 1256, characters 8-56
Called from file "src/fiber/fiber.ml", line 114, characters 10-15
Re-raised at file "src/stdune/exn.ml" (inlined), line 37, characters 27-56
Called from file "src/stdune/exn_with_backtrace.ml", line 13, characters 33-71
Called from file "src/fiber/fiber.ml", line 85, characters 10-17
Re-raised at file "src/stdune/exn.ml" (inlined), line 37, characters 27-56
Called from file "src/stdune/exn_with_backtrace.ml", line 13, characters 33-71
Called from file "src/fiber/fiber.ml", line 85, characters 10-17
Re-raised at file "src/stdune/exn.ml" (inlined), line 37, characters 27-56
Called from file "src/stdune/exn_with_backtrace.ml", line 13, characters 33-71
Called from file "src/fiber/fiber.ml", line 85, characters 10-17
Re-raised at file "src/stdune/exn.ml" (inlined), line 37, characters 27-56
Called from file "src/stdune/exn_with_backtrace.ml", line 13, characters 33-71
Called from file "src/fiber/fiber.ml", line 85, characters 10-17

I must not segfault.  Uncertainty is the mind-killer.  Exceptions are
the little-death that brings total obliteration.  I will fully express
my cases.  Execution will pass over me and through me.  And when it
has gone past, I will unwind the stack along its path.  Where the
cases are handled there will be nothing.  Only I will remain.