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ci/spec22-gems: bisect the sassc closure through ffi on LoadError (incident 13 round 6) #91

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Merged
ronaldtse merged 1 commit into from
Aug 19, 2026
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ci/spec22-gems: bisect the sassc closure through ffi on LoadError (incident 13 round 6) #91

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39 changes: 37 additions & 2 deletions ci/spec22-gems/fixtures/probe.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -176,6 +176,41 @@ def sassc_partial(styles)
).render
end

# Incident 13 round 6 diagnostics: ffi's load of the vendored
# libsass.so fails the OS bind (error 126) with the closure walk
# provably complete — both vendored siblings parse and materialize
# beside the importer, and the api-ms-* host surface is proven by the
# runtime's own boot. The failing link is only measurable on the
# windows loader itself, so on LoadError bisect the closure from
# inside through the same ffi path: two host-surface controls by bare
# name (a stock OS module; an api-ms-win-crt contract), then each
# vendored sibling individually, then the top module again. The
# per-module verdicts name the missing piece; a retry success names a
# host-side transient (a lock race), not the closure. Never gates: the
# original LoadError re-raises after the verdicts.
def require_sassc_with_bisect
require "sassc"
rescue LoadError => e
bisect = { "ADVAPI32.dll" => "ADVAPI32.dll",
"api-ms-win-crt-runtime-l1-1-0.dll" => "api-ms-win-crt-runtime-l1-1-0.dll" }
spec = Gem.loaded_specs["sassc"]
if spec.nil?
puts "PROBE-DIAG dep-load skipped (the sassc spec never activated)"
else
native_dir = File.join(spec.gem_dir, "lib", "sassc")
%w[libwinpthread-1.dll libgcc_s_seh-1.dll libsass.so].each do |mod|
bisect[mod] = File.join(native_dir, mod)
end
end
bisect.each do |label, spell|
FFI::DynamicLibrary.load_library(spell, FFI::DynamicLibrary::RTLD_LAZY)
puts "PROBE-DIAG dep-load #{label} ok"
rescue LoadError => le
puts "PROBE-DIAG dep-load #{label} fail #{le.message.lines.first.to_s.strip}"
end
raise e
end

case ARGV[0]
when "sinatra-fixed", "sinatra-unfixed"
fixed = ARGV[0] == "sinatra-fixed"
Expand All @@ -200,7 +235,7 @@ def sassc_partial(styles)
exit 1
end
when "sassc"
require "sassc"
require_sassc_with_bisect
puts "PROBE sassc-version #{SassC::VERSION}"
css = SassC::Engine.new(File.read(File.join(PROBE_DIR, "styles/plain.scss"))).render
if css.include?(".spec22-gems") && css.include?("color: #1d2d3c")
Expand All @@ -226,7 +261,7 @@ def sassc_partial(styles)
exit 1
end
when "sassc-unmaterialized"
require "sassc"
require_sassc_with_bisect
puts "PROBE sassc-version #{SassC::VERSION}"
begin
# The SAME import against the image pressed WITHOUT materialize: —
Expand Down