/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=BIGGEST --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 [2020-08-21 17:27:35,048 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 17:27:35,051 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 17:27:35,078 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 17:27:35,079 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 17:27:35,080 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 17:27:35,081 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 17:27:35,083 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 17:27:35,085 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 17:27:35,086 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 17:27:35,087 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 17:27:35,088 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 17:27:35,088 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 17:27:35,089 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 17:27:35,090 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 17:27:35,091 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 17:27:35,092 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 17:27:35,093 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 17:27:35,095 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 17:27:35,097 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 17:27:35,098 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 17:27:35,099 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 17:27:35,100 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 17:27:35,101 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 17:27:35,104 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 17:27:35,112 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 17:27:35,113 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 17:27:35,113 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 17:27:35,114 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 [2020-08-21 17:27:35,140 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 17:27:35,141 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 17:27:35,142 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 17:27:35,142 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 17:27:35,142 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 17:27:35,143 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 17:27:35,143 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 17:27:35,143 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 17:27:35,144 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 17:27:35,144 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 17:27:35,144 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 17:27:35,144 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 17:27:35,144 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 17:27:35,145 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 17:27:35,145 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 17:27:35,145 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 17:27:35,145 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 17:27:35,145 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 17:27:35,146 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 17:27:35,147 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 17:27:35,147 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 17:27:35,147 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:27:35,148 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 17:27:35,148 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 17:27:35,148 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 17:27:35,148 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 17:27:35,148 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 17:27:35,149 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 17:27:35,149 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 17:27:35,149 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=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; [2020-08-21 17:27:35,460 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 17:27:35,473 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 17:27:35,476 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 17:27:35,478 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 17:27:35,479 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 17:27:35,479 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-08-21 17:27:35,559 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c22941f12/cdf965afdcfa4280b49320378e82cc21/FLAG04eb1ffbf [2020-08-21 17:27:35,992 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 17:27:35,993 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-08-21 17:27:35,999 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c22941f12/cdf965afdcfa4280b49320378e82cc21/FLAG04eb1ffbf [2020-08-21 17:27:36,365 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c22941f12/cdf965afdcfa4280b49320378e82cc21 [2020-08-21 17:27:36,374 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 17:27:36,376 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 17:27:36,377 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 17:27:36,377 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 17:27:36,384 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 17:27:36,385 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,388 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5cf7e795 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36, skipping insertion in model container [2020-08-21 17:27:36,389 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,397 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 17:27:36,418 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 17:27:36,602 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:27:36,606 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 17:27:36,630 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:27:36,649 INFO L208 MainTranslator]: Completed translation [2020-08-21 17:27:36,650 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36 WrapperNode [2020-08-21 17:27:36,650 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 17:27:36,651 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 17:27:36,651 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 17:27:36,651 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 17:27:36,748 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,750 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,757 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,757 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,765 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,771 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,772 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (1/1) ... [2020-08-21 17:27:36,779 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 17:27:36,780 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 17:27:36,780 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 17:27:36,780 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 17:27:36,781 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (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 [2020-08-21 17:27:36,839 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 17:27:36,839 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 17:27:36,839 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 17:27:36,840 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 17:27:36,840 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 17:27:36,840 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 17:27:36,841 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 17:27:36,841 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 17:27:36,841 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-21 17:27:36,841 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 17:27:36,841 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 17:27:36,842 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 17:27:36,842 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 17:27:36,842 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 17:27:36,842 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 17:27:36,842 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 17:27:37,127 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 17:27:37,128 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 17:27:37,132 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:27:37 BoogieIcfgContainer [2020-08-21 17:27:37,132 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 17:27:37,133 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 17:27:37,133 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 17:27:37,136 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 17:27:37,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 05:27:36" (1/3) ... [2020-08-21 17:27:37,137 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@364766bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:27:37, skipping insertion in model container [2020-08-21 17:27:37,137 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:36" (2/3) ... [2020-08-21 17:27:37,137 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@364766bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:27:37, skipping insertion in model container [2020-08-21 17:27:37,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:27:37" (3/3) ... [2020-08-21 17:27:37,139 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-08-21 17:27:37,148 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 17:27:37,154 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 17:27:37,167 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 17:27:37,191 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 17:27:37,191 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 17:27:37,191 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 17:27:37,191 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 17:27:37,192 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 17:27:37,192 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 17:27:37,192 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 17:27:37,192 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 17:27:37,212 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-08-21 17:27:37,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 17:27:37,217 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:37,218 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:37,218 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:37,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:37,223 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-08-21 17:27:37,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:37,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [504264521] [2020-08-21 17:27:37,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:37,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:37,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:37,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:37,409 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:37,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [504264521] [2020-08-21 17:27:37,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:37,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 17:27:37,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674828880] [2020-08-21 17:27:37,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 17:27:37,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:37,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 17:27:37,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 17:27:37,432 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-08-21 17:27:37,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:37,537 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-08-21 17:27:37,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 17:27:37,541 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 17:27:37,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:37,550 INFO L225 Difference]: With dead ends: 51 [2020-08-21 17:27:37,551 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 17:27:37,555 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 [2020-08-21 17:27:37,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 17:27:37,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 17:27:37,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 17:27:37,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-21 17:27:37,599 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-08-21 17:27:37,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:37,600 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-21 17:27:37,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 17:27:37,600 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-21 17:27:37,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 17:27:37,601 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:37,602 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:37,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 17:27:37,603 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:37,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:37,603 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-08-21 17:27:37,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:37,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [833541720] [2020-08-21 17:27:37,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:37,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:37,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:37,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:37,720 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:37,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [833541720] [2020-08-21 17:27:37,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:37,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 17:27:37,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346292756] [2020-08-21 17:27:37,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:27:37,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:37,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:27:37,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:27:37,725 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-08-21 17:27:37,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:37,839 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-08-21 17:27:37,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 17:27:37,840 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-21 17:27:37,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:37,843 INFO L225 Difference]: With dead ends: 44 [2020-08-21 17:27:37,843 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 17:27:37,844 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 [2020-08-21 17:27:37,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 17:27:37,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-08-21 17:27:37,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 17:27:37,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-08-21 17:27:37,857 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-08-21 17:27:37,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:37,857 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-08-21 17:27:37,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:27:37,858 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-08-21 17:27:37,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 17:27:37,859 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:37,859 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:37,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 17:27:37,859 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:37,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:37,860 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-08-21 17:27:37,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:37,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1003905669] [2020-08-21 17:27:37,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:37,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:37,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:37,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:37,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 17:27:37,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1003905669] [2020-08-21 17:27:37,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:37,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 17:27:37,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644218753] [2020-08-21 17:27:37,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:27:37,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:37,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:27:37,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:27:37,955 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-08-21 17:27:38,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:38,060 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-21 17:27:38,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 17:27:38,061 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-21 17:27:38,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:38,062 INFO L225 Difference]: With dead ends: 37 [2020-08-21 17:27:38,062 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 17:27:38,063 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 [2020-08-21 17:27:38,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 17:27:38,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 17:27:38,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 17:27:38,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-21 17:27:38,070 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-08-21 17:27:38,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:38,071 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-21 17:27:38,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:27:38,071 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-21 17:27:38,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 17:27:38,072 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:38,072 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] [2020-08-21 17:27:38,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 17:27:38,073 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:38,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:38,074 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-08-21 17:27:38,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:38,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [146010520] [2020-08-21 17:27:38,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:38,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:38,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,586 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:38,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [146010520] [2020-08-21 17:27:38,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:38,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 17:27:38,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949724618] [2020-08-21 17:27:38,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 17:27:38,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:38,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 17:27:38,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:27:38,590 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 13 states. [2020-08-21 17:27:39,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:39,181 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-21 17:27:39,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 17:27:39,182 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-08-21 17:27:39,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:39,183 INFO L225 Difference]: With dead ends: 50 [2020-08-21 17:27:39,184 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 17:27:39,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2020-08-21 17:27:39,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 17:27:39,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2020-08-21 17:27:39,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 17:27:39,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 17:27:39,196 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-08-21 17:27:39,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:39,196 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 17:27:39,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 17:27:39,197 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 17:27:39,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 17:27:39,198 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:39,198 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] [2020-08-21 17:27:39,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 17:27:39,199 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:39,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:39,199 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-08-21 17:27:39,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:39,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [394219136] [2020-08-21 17:27:39,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:39,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:39,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:39,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:39,275 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:39,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [394219136] [2020-08-21 17:27:39,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:39,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 17:27:39,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930262835] [2020-08-21 17:27:39,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:27:39,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:39,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:27:39,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:27:39,278 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-08-21 17:27:39,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:39,455 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-08-21 17:27:39,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 17:27:39,456 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-08-21 17:27:39,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:39,457 INFO L225 Difference]: With dead ends: 59 [2020-08-21 17:27:39,457 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 17:27:39,458 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 [2020-08-21 17:27:39,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 17:27:39,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-08-21 17:27:39,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 17:27:39,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 17:27:39,466 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-08-21 17:27:39,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:39,467 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 17:27:39,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:27:39,468 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 17:27:39,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 17:27:39,469 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:39,469 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] [2020-08-21 17:27:39,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 17:27:39,469 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:39,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:39,470 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-08-21 17:27:39,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:39,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1759578225] [2020-08-21 17:27:39,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:39,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:39,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:39,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:39,887 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:39,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1759578225] [2020-08-21 17:27:39,888 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:39,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 17:27:39,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953601127] [2020-08-21 17:27:39,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 17:27:39,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:39,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 17:27:39,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:27:39,890 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 15 states. [2020-08-21 17:27:40,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:40,713 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-08-21 17:27:40,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 17:27:40,714 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2020-08-21 17:27:40,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:40,717 INFO L225 Difference]: With dead ends: 70 [2020-08-21 17:27:40,717 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 17:27:40,718 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 [2020-08-21 17:27:40,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 17:27:40,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-08-21 17:27:40,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 17:27:40,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-21 17:27:40,728 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-08-21 17:27:40,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:40,728 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-21 17:27:40,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 17:27:40,729 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-21 17:27:40,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 17:27:40,730 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:40,730 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] [2020-08-21 17:27:40,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 17:27:40,730 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:40,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:40,731 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-08-21 17:27:40,731 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:40,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1125905984] [2020-08-21 17:27:40,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:40,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:40,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:40,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:40,822 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:40,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1125905984] [2020-08-21 17:27:40,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:40,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 17:27:40,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576913315] [2020-08-21 17:27:40,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 17:27:40,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:40,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 17:27:40,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:27:40,825 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-21 17:27:41,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:41,013 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-08-21 17:27:41,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 17:27:41,013 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-08-21 17:27:41,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:41,015 INFO L225 Difference]: With dead ends: 74 [2020-08-21 17:27:41,015 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 17:27:41,015 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 [2020-08-21 17:27:41,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 17:27:41,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-08-21 17:27:41,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 17:27:41,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-21 17:27:41,025 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-08-21 17:27:41,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:41,025 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-21 17:27:41,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 17:27:41,025 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-21 17:27:41,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 17:27:41,026 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:41,026 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] [2020-08-21 17:27:41,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 17:27:41,027 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:41,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:41,027 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-08-21 17:27:41,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:41,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2009545924] [2020-08-21 17:27:41,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:41,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:41,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:41,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:41,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 17:27:41,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:41,139 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 17:27:41,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2009545924] [2020-08-21 17:27:41,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:41,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 17:27:41,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40094025] [2020-08-21 17:27:41,141 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 17:27:41,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:41,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 17:27:41,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:27:41,142 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-08-21 17:27:41,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:41,264 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-08-21 17:27:41,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 17:27:41,264 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-08-21 17:27:41,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:41,266 INFO L225 Difference]: With dead ends: 75 [2020-08-21 17:27:41,266 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 17:27:41,267 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 [2020-08-21 17:27:41,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 17:27:41,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-08-21 17:27:41,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 17:27:41,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-08-21 17:27:41,282 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2020-08-21 17:27:41,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:41,283 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-08-21 17:27:41,283 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 17:27:41,283 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-08-21 17:27:41,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 17:27:41,286 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:41,286 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] [2020-08-21 17:27:41,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 17:27:41,286 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:41,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:41,287 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-08-21 17:27:41,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:41,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653731722] [2020-08-21 17:27:41,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:41,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:41,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:41,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:41,682 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:41,683 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653731722] [2020-08-21 17:27:41,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:41,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 17:27:41,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813595264] [2020-08-21 17:27:41,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 17:27:41,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:41,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 17:27:41,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:27:41,689 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 17 states. [2020-08-21 17:27:43,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:43,288 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2020-08-21 17:27:43,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 17:27:43,293 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2020-08-21 17:27:43,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:43,294 INFO L225 Difference]: With dead ends: 97 [2020-08-21 17:27:43,294 INFO L226 Difference]: Without dead ends: 95 [2020-08-21 17:27:43,296 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 [2020-08-21 17:27:43,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-21 17:27:43,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 52. [2020-08-21 17:27:43,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 17:27:43,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-08-21 17:27:43,314 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2020-08-21 17:27:43,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:43,316 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-08-21 17:27:43,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 17:27:43,316 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-08-21 17:27:43,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 17:27:43,317 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:43,317 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] [2020-08-21 17:27:43,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 17:27:43,318 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:43,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:43,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-08-21 17:27:43,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:43,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [149087404] [2020-08-21 17:27:43,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:43,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:43,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:43,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:43,434 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:43,435 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [149087404] [2020-08-21 17:27:43,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:43,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 17:27:43,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422628893] [2020-08-21 17:27:43,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 17:27:43,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:43,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 17:27:43,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:27:43,437 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-08-21 17:27:43,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:43,707 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-08-21 17:27:43,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 17:27:43,708 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-21 17:27:43,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:43,709 INFO L225 Difference]: With dead ends: 88 [2020-08-21 17:27:43,709 INFO L226 Difference]: Without dead ends: 77 [2020-08-21 17:27:43,710 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 [2020-08-21 17:27:43,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-21 17:27:43,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-08-21 17:27:43,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 17:27:43,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-08-21 17:27:43,720 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-08-21 17:27:43,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:43,720 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-08-21 17:27:43,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 17:27:43,720 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-08-21 17:27:43,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 17:27:43,721 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:43,721 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] [2020-08-21 17:27:43,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 17:27:43,722 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:43,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:43,722 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-08-21 17:27:43,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:43,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [433363761] [2020-08-21 17:27:43,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:43,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 17:27:43,744 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 17:27:43,744 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 17:27:43,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 17:27:43,767 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 05:27:43 BoogieIcfgContainer [2020-08-21 17:27:43,768 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 17:27:43,770 INFO L168 Benchmark]: Toolchain (without parser) took 7394.20 ms. Allocated memory was 146.8 MB in the beginning and 305.7 MB in the end (delta: 158.9 MB). Free memory was 102.9 MB in the beginning and 226.3 MB in the end (delta: -123.4 MB). Peak memory consumption was 35.4 MB. Max. memory is 7.1 GB. [2020-08-21 17:27:43,771 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 146.8 MB. Free memory was 121.3 MB in the beginning and 121.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 17:27:43,772 INFO L168 Benchmark]: CACSL2BoogieTranslator took 273.57 ms. Allocated memory is still 146.8 MB. Free memory was 102.7 MB in the beginning and 92.4 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-08-21 17:27:43,773 INFO L168 Benchmark]: Boogie Preprocessor took 128.82 ms. Allocated memory was 146.8 MB in the beginning and 202.4 MB in the end (delta: 55.6 MB). Free memory was 92.4 MB in the beginning and 179.6 MB in the end (delta: -87.2 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-08-21 17:27:43,773 INFO L168 Benchmark]: RCFGBuilder took 352.24 ms. Allocated memory is still 202.4 MB. Free memory was 179.6 MB in the beginning and 163.3 MB in the end (delta: 16.3 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. [2020-08-21 17:27:43,774 INFO L168 Benchmark]: TraceAbstraction took 6634.71 ms. Allocated memory was 202.4 MB in the beginning and 305.7 MB in the end (delta: 103.3 MB). Free memory was 162.6 MB in the beginning and 226.3 MB in the end (delta: -63.7 MB). Peak memory consumption was 39.6 MB. Max. memory is 7.1 GB. [2020-08-21 17:27:43,777 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 146.8 MB. Free memory was 121.3 MB in the beginning and 121.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 273.57 ms. Allocated memory is still 146.8 MB. Free memory was 102.7 MB in the beginning and 92.4 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 128.82 ms. Allocated memory was 146.8 MB in the beginning and 202.4 MB in the end (delta: 55.6 MB). Free memory was 92.4 MB in the beginning and 179.6 MB in the end (delta: -87.2 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 352.24 ms. Allocated memory is still 202.4 MB. Free memory was 179.6 MB in the beginning and 163.3 MB in the end (delta: 16.3 MB). Peak memory consumption was 16.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6634.71 ms. Allocated memory was 202.4 MB in the beginning and 305.7 MB in the end (delta: 103.3 MB). Free memory was 162.6 MB in the beginning and 226.3 MB in the end (delta: -63.7 MB). Peak memory consumption was 39.6 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