/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 06:24:00,759 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 06:24:00,763 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 06:24:00,802 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 06:24:00,804 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 06:24:00,812 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 06:24:00,814 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 06:24:00,817 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 06:24:00,820 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 06:24:00,824 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 06:24:00,825 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 06:24:00,826 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 06:24:00,826 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 06:24:00,829 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 06:24:00,831 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 06:24:00,833 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 06:24:00,834 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 06:24:00,835 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 06:24:00,837 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 06:24:00,845 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 06:24:00,847 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 06:24:00,848 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 06:24:00,849 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 06:24:00,851 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 06:24:00,865 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 06:24:00,866 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 06:24:00,866 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 06:24:00,870 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 06:24:00,870 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 06:24:00,871 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-22 06:24:00,871 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-22 06:24:00,872 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-22 06:24:00,873 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-22 06:24:00,877 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-22 06:24:00,878 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-22 06:24:00,878 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-22 06:24:00,879 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-22 06:24:00,879 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-22 06:24:00,879 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 06:24:00,880 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 06:24:00,880 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 06:24:00,882 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 06:24:00,922 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 06:24:00,922 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 06:24:00,924 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 06:24:00,925 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 06:24:00,925 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 06:24:00,925 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 06:24:00,926 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 06:24:00,926 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 06:24:00,926 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 06:24:00,926 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 06:24:00,927 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 06:24:00,927 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 06:24:00,928 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 06:24:00,928 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 06:24:00,928 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 06:24:00,928 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 06:24:00,929 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 06:24:00,929 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 06:24:00,929 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 06:24:00,929 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 06:24:00,929 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 06:24:00,930 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 06:24:00,930 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 06:24:00,930 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 06:24:00,930 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 06:24:00,930 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 06:24:00,931 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 06:24:00,931 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 06:24:00,931 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 06:24:00,931 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5;log-additional-information=true; [2020-08-22 06:24:01,236 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 06:24:01,249 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 06:24:01,252 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 06:24:01,254 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 06:24:01,254 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 06:24:01,255 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-08-22 06:24:01,313 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d1efe9905/7eace0891d4c485fa6530a1ecb9c0902/FLAG17fca0634 [2020-08-22 06:24:01,767 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 06:24:01,768 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-08-22 06:24:01,777 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d1efe9905/7eace0891d4c485fa6530a1ecb9c0902/FLAG17fca0634 [2020-08-22 06:24:02,167 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d1efe9905/7eace0891d4c485fa6530a1ecb9c0902 [2020-08-22 06:24:02,178 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 06:24:02,179 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 06:24:02,180 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 06:24:02,181 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 06:24:02,186 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 06:24:02,187 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:24:02" (1/1) ... [2020-08-22 06:24:02,189 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6266eb80 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:02, skipping insertion in model container [2020-08-22 06:24:02,190 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 06:24:02" (1/1) ... [2020-08-22 06:24:02,197 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 06:24:02,215 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 06:24:02,389 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 06:24:02,393 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 06:24:02,413 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 06:24:02,431 INFO L208 MainTranslator]: Completed translation [2020-08-22 06:24:02,432 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:02 WrapperNode [2020-08-22 06:24:02,432 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 06:24:02,432 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 06:24:02,433 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 06:24:02,433 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 06:24:02,537 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:02" (1/1) ... [2020-08-22 06:24:02,538 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:02" (1/1) ... [2020-08-22 06:24:02,548 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:02" (1/1) ... [2020-08-22 06:24:02,548 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:02" (1/1) ... [2020-08-22 06:24:02,556 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:02" (1/1) ... [2020-08-22 06:24:02,562 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:02" (1/1) ... [2020-08-22 06:24:02,567 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:02" (1/1) ... [2020-08-22 06:24:02,571 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 06:24:02,572 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 06:24:02,572 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 06:24:02,572 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 06:24:02,573 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:02" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 06:24:02,642 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 06:24:02,643 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 06:24:02,644 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 06:24:02,644 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 06:24:02,644 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 06:24:02,644 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 06:24:02,644 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 06:24:02,644 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-22 06:24:02,644 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-22 06:24:02,645 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 06:24:02,646 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 06:24:02,646 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 06:24:02,646 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 06:24:02,646 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 06:24:02,646 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 06:24:02,647 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 06:24:02,909 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 06:24:02,910 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-22 06:24:02,915 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:24:02 BoogieIcfgContainer [2020-08-22 06:24:02,915 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 06:24:02,916 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 06:24:02,916 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 06:24:02,924 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 06:24:02,924 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 06:24:02" (1/3) ... [2020-08-22 06:24:02,925 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@581248c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:24:02, skipping insertion in model container [2020-08-22 06:24:02,925 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 06:24:02" (2/3) ... [2020-08-22 06:24:02,926 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@581248c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 06:24:02, skipping insertion in model container [2020-08-22 06:24:02,926 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 06:24:02" (3/3) ... [2020-08-22 06:24:02,931 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-08-22 06:24:02,958 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 06:24:02,972 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 06:24:02,999 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 06:24:03,021 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 06:24:03,021 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 06:24:03,021 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 06:24:03,022 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 06:24:03,022 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 06:24:03,022 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 06:24:03,022 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 06:24:03,022 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 06:24:03,039 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-08-22 06:24:03,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 06:24:03,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:03,046 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:03,047 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:03,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:03,053 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-08-22 06:24:03,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:03,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [936702676] [2020-08-22 06:24:03,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:03,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:03,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:03,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:03,254 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:03,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [936702676] [2020-08-22 06:24:03,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:24:03,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 06:24:03,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635862821] [2020-08-22 06:24:03,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 06:24:03,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:03,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 06:24:03,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 06:24:03,275 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-08-22 06:24:03,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:03,375 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-08-22 06:24:03,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 06:24:03,378 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-22 06:24:03,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:03,388 INFO L225 Difference]: With dead ends: 51 [2020-08-22 06:24:03,388 INFO L226 Difference]: Without dead ends: 24 [2020-08-22 06:24:03,392 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 06:24:03,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-22 06:24:03,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-22 06:24:03,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 06:24:03,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-22 06:24:03,437 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-08-22 06:24:03,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:03,437 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-22 06:24:03,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 06:24:03,438 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-22 06:24:03,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 06:24:03,438 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:03,439 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:03,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 06:24:03,439 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:03,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:03,440 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-08-22 06:24:03,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:03,442 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209715719] [2020-08-22 06:24:03,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:03,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:03,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:03,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:03,555 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:03,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209715719] [2020-08-22 06:24:03,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:24:03,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 06:24:03,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522077955] [2020-08-22 06:24:03,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 06:24:03,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:03,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 06:24:03,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-22 06:24:03,560 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-08-22 06:24:03,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:03,672 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-08-22 06:24:03,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 06:24:03,673 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-22 06:24:03,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:03,676 INFO L225 Difference]: With dead ends: 44 [2020-08-22 06:24:03,676 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 06:24:03,678 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 06:24:03,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 06:24:03,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-08-22 06:24:03,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 06:24:03,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-08-22 06:24:03,690 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-08-22 06:24:03,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:03,691 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-08-22 06:24:03,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 06:24:03,691 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-08-22 06:24:03,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 06:24:03,692 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:03,692 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:03,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 06:24:03,693 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:03,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:03,693 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-08-22 06:24:03,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:03,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [487300926] [2020-08-22 06:24:03,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:03,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:03,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:03,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:03,816 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 06:24:03,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [487300926] [2020-08-22 06:24:03,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 06:24:03,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 06:24:03,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715403444] [2020-08-22 06:24:03,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 06:24:03,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:03,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 06:24:03,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 06:24:03,822 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-08-22 06:24:03,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:03,944 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-22 06:24:03,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 06:24:03,944 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-22 06:24:03,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:03,946 INFO L225 Difference]: With dead ends: 37 [2020-08-22 06:24:03,946 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 06:24:03,947 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 06:24:03,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 06:24:03,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-22 06:24:03,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 06:24:03,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-22 06:24:03,954 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-08-22 06:24:03,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:03,955 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-22 06:24:03,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 06:24:03,955 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-22 06:24:03,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 06:24:03,956 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:03,956 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:03,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 06:24:03,957 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:03,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:03,957 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-08-22 06:24:03,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:03,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461347472] [2020-08-22 06:24:03,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:04,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:04,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:04,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:04,451 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:04,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461347472] [2020-08-22 06:24:04,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:04,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 06:24:04,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675515662] [2020-08-22 06:24:04,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 06:24:04,453 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:04,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 06:24:04,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-08-22 06:24:04,454 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 13 states. [2020-08-22 06:24:04,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:04,971 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-22 06:24:04,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 06:24:04,972 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-08-22 06:24:04,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:04,974 INFO L225 Difference]: With dead ends: 50 [2020-08-22 06:24:04,974 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 06:24:04,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2020-08-22 06:24:04,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 06:24:04,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2020-08-22 06:24:04,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 06:24:04,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-22 06:24:04,986 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-08-22 06:24:04,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:04,986 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-22 06:24:04,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 06:24:04,987 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-22 06:24:04,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 06:24:04,988 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:04,988 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:04,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 06:24:04,989 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:04,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:04,990 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-08-22 06:24:04,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:04,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1214858791] [2020-08-22 06:24:04,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:05,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:05,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:05,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:05,092 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:05,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1214858791] [2020-08-22 06:24:05,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:05,093 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 06:24:05,093 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567552473] [2020-08-22 06:24:05,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 06:24:05,094 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:05,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 06:24:05,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-22 06:24:05,094 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-08-22 06:24:05,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:05,248 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-08-22 06:24:05,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 06:24:05,249 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-08-22 06:24:05,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:05,251 INFO L225 Difference]: With dead ends: 59 [2020-08-22 06:24:05,251 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 06:24:05,252 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-08-22 06:24:05,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 06:24:05,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-08-22 06:24:05,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 06:24:05,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-22 06:24:05,262 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-08-22 06:24:05,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:05,262 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-22 06:24:05,262 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 06:24:05,262 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-22 06:24:05,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 06:24:05,263 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:05,263 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:05,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 06:24:05,264 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:05,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:05,264 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-08-22 06:24:05,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:05,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [239498295] [2020-08-22 06:24:05,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:05,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:05,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:05,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:05,654 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:05,655 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [239498295] [2020-08-22 06:24:05,655 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:05,655 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 06:24:05,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762570263] [2020-08-22 06:24:05,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 06:24:05,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:05,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 06:24:05,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2020-08-22 06:24:05,657 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 15 states. [2020-08-22 06:24:06,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:06,454 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-08-22 06:24:06,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 06:24:06,455 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2020-08-22 06:24:06,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:06,458 INFO L225 Difference]: With dead ends: 70 [2020-08-22 06:24:06,458 INFO L226 Difference]: Without dead ends: 68 [2020-08-22 06:24:06,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2020-08-22 06:24:06,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-22 06:24:06,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-08-22 06:24:06,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 06:24:06,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-22 06:24:06,468 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-08-22 06:24:06,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:06,468 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-22 06:24:06,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 06:24:06,469 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-22 06:24:06,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 06:24:06,470 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:06,470 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:06,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 06:24:06,470 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:06,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:06,471 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-08-22 06:24:06,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:06,471 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [743551697] [2020-08-22 06:24:06,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:06,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:06,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:06,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:06,538 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:06,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [743551697] [2020-08-22 06:24:06,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:06,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 06:24:06,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053669510] [2020-08-22 06:24:06,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 06:24:06,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:06,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 06:24:06,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 06:24:06,541 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-22 06:24:06,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:06,757 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-08-22 06:24:06,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 06:24:06,757 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-08-22 06:24:06,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:06,758 INFO L225 Difference]: With dead ends: 74 [2020-08-22 06:24:06,758 INFO L226 Difference]: Without dead ends: 63 [2020-08-22 06:24:06,759 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-22 06:24:06,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-22 06:24:06,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-08-22 06:24:06,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 06:24:06,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-22 06:24:06,769 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-08-22 06:24:06,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:06,770 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-22 06:24:06,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 06:24:06,770 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-22 06:24:06,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 06:24:06,771 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:06,771 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:06,772 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 06:24:06,772 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:06,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:06,772 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-08-22 06:24:06,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:06,773 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [195755338] [2020-08-22 06:24:06,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:06,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:06,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:06,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:06,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-22 06:24:06,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:06,838 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 06:24:06,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [195755338] [2020-08-22 06:24:06,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:06,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 06:24:06,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377241723] [2020-08-22 06:24:06,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 06:24:06,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:06,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 06:24:06,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 06:24:06,840 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-08-22 06:24:06,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:06,959 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-08-22 06:24:06,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 06:24:06,960 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-08-22 06:24:06,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:06,961 INFO L225 Difference]: With dead ends: 75 [2020-08-22 06:24:06,961 INFO L226 Difference]: Without dead ends: 55 [2020-08-22 06:24:06,962 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-22 06:24:06,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-22 06:24:06,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-08-22 06:24:06,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-22 06:24:06,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-08-22 06:24:06,970 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2020-08-22 06:24:06,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:06,970 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-08-22 06:24:06,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 06:24:06,971 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-08-22 06:24:06,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 06:24:06,972 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:06,972 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:06,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 06:24:06,972 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:06,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:06,973 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-08-22 06:24:06,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:06,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443724876] [2020-08-22 06:24:06,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:06,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:07,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:07,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:07,340 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:07,340 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443724876] [2020-08-22 06:24:07,340 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:07,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 06:24:07,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444853572] [2020-08-22 06:24:07,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 06:24:07,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:07,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 06:24:07,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2020-08-22 06:24:07,343 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 17 states. [2020-08-22 06:24:08,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:08,896 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2020-08-22 06:24:08,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 06:24:08,900 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2020-08-22 06:24:08,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:08,901 INFO L225 Difference]: With dead ends: 97 [2020-08-22 06:24:08,901 INFO L226 Difference]: Without dead ends: 95 [2020-08-22 06:24:08,903 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=250, Invalid=1556, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 06:24:08,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-22 06:24:08,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 52. [2020-08-22 06:24:08,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-22 06:24:08,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-08-22 06:24:08,912 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2020-08-22 06:24:08,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:08,913 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-08-22 06:24:08,913 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 06:24:08,913 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-08-22 06:24:08,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 06:24:08,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:08,914 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:08,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 06:24:08,915 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:08,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:08,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-08-22 06:24:08,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:08,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [751135217] [2020-08-22 06:24:08,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:08,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:08,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 06:24:08,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 06:24:08,978 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 06:24:08,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [751135217] [2020-08-22 06:24:08,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 06:24:08,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 06:24:08,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653636093] [2020-08-22 06:24:08,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 06:24:08,979 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 06:24:08,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 06:24:08,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-22 06:24:08,980 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-08-22 06:24:09,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 06:24:09,258 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-08-22 06:24:09,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 06:24:09,258 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-22 06:24:09,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 06:24:09,259 INFO L225 Difference]: With dead ends: 88 [2020-08-22 06:24:09,259 INFO L226 Difference]: Without dead ends: 77 [2020-08-22 06:24:09,260 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-08-22 06:24:09,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-22 06:24:09,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-08-22 06:24:09,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-22 06:24:09,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-08-22 06:24:09,279 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-08-22 06:24:09,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 06:24:09,279 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-08-22 06:24:09,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 06:24:09,280 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-08-22 06:24:09,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 06:24:09,283 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 06:24:09,288 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 06:24:09,288 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 06:24:09,289 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 06:24:09,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 06:24:09,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-08-22 06:24:09,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 06:24:09,290 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659852752] [2020-08-22 06:24:09,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 06:24:09,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 06:24:09,335 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 06:24:09,335 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 06:24:09,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 06:24:09,371 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 06:24:09 BoogieIcfgContainer [2020-08-22 06:24:09,371 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 06:24:09,375 INFO L168 Benchmark]: Toolchain (without parser) took 7194.22 ms. Allocated memory was 143.7 MB in the beginning and 284.2 MB in the end (delta: 140.5 MB). Free memory was 103.9 MB in the beginning and 134.2 MB in the end (delta: -30.3 MB). Peak memory consumption was 110.2 MB. Max. memory is 7.1 GB. [2020-08-22 06:24:09,376 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 143.7 MB. Free memory was 122.7 MB in the beginning and 122.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-22 06:24:09,377 INFO L168 Benchmark]: CACSL2BoogieTranslator took 251.67 ms. Allocated memory is still 143.7 MB. Free memory was 103.6 MB in the beginning and 93.3 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-08-22 06:24:09,382 INFO L168 Benchmark]: Boogie Preprocessor took 138.88 ms. Allocated memory was 143.7 MB in the beginning and 205.0 MB in the end (delta: 61.3 MB). Free memory was 93.3 MB in the beginning and 182.3 MB in the end (delta: -89.0 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-08-22 06:24:09,383 INFO L168 Benchmark]: RCFGBuilder took 343.52 ms. Allocated memory is still 205.0 MB. Free memory was 182.3 MB in the beginning and 166.1 MB in the end (delta: 16.1 MB). Peak memory consumption was 16.1 MB. Max. memory is 7.1 GB. [2020-08-22 06:24:09,383 INFO L168 Benchmark]: TraceAbstraction took 6455.28 ms. Allocated memory was 205.0 MB in the beginning and 284.2 MB in the end (delta: 79.2 MB). Free memory was 165.5 MB in the beginning and 134.2 MB in the end (delta: 31.3 MB). Peak memory consumption was 110.5 MB. Max. memory is 7.1 GB. [2020-08-22 06:24:09,396 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 143.7 MB. Free memory was 122.7 MB in the beginning and 122.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 251.67 ms. Allocated memory is still 143.7 MB. Free memory was 103.6 MB in the beginning and 93.3 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 138.88 ms. Allocated memory was 143.7 MB in the beginning and 205.0 MB in the end (delta: 61.3 MB). Free memory was 93.3 MB in the beginning and 182.3 MB in the end (delta: -89.0 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 343.52 ms. Allocated memory is still 205.0 MB. Free memory was 182.3 MB in the beginning and 166.1 MB in the end (delta: 16.1 MB). Peak memory consumption was 16.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6455.28 ms. Allocated memory was 205.0 MB in the beginning and 284.2 MB in the end (delta: 79.2 MB). Free memory was 165.5 MB in the beginning and 134.2 MB in the end (delta: 31.3 MB). Peak memory consumption was 110.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); [L15] COND FALSE !(!(MAX > 0)) [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i