/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 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum01_bug02.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 13:43:13,035 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 13:43:13,040 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 13:43:13,085 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 13:43:13,086 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 13:43:13,097 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 13:43:13,100 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 13:43:13,105 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 13:43:13,107 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 13:43:13,111 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 13:43:13,112 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 13:43:13,114 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 13:43:13,114 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 13:43:13,117 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 13:43:13,120 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 13:43:13,122 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 13:43:13,123 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 13:43:13,125 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 13:43:13,127 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 13:43:13,136 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 13:43:13,138 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 13:43:13,140 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 13:43:13,141 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 13:43:13,142 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 13:43:13,145 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-04 13:43:13,145 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-04 13:43:13,145 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-04 13:43:13,148 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-04 13:43:13,149 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-04 13:43:13,150 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-04 13:43:13,150 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-04 13:43:13,151 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-04 13:43:13,152 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-04 13:43:13,155 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-04 13:43:13,156 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-04 13:43:13,156 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-04 13:43:13,157 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-04 13:43:13,157 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-04 13:43:13,158 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 13:43:13,159 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 13:43:13,160 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 13:43:13,161 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 [2020-09-04 13:43:13,208 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 13:43:13,209 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 13:43:13,211 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-04 13:43:13,211 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-04 13:43:13,211 INFO L138 SettingsManager]: * Use SBE=true [2020-09-04 13:43:13,212 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 13:43:13,212 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 13:43:13,212 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 13:43:13,212 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 13:43:13,213 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 13:43:13,214 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 13:43:13,214 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 13:43:13,214 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 13:43:13,215 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 13:43:13,215 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 13:43:13,215 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 13:43:13,215 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 13:43:13,216 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 13:43:13,216 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-04 13:43:13,216 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 13:43:13,216 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 13:43:13,216 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 13:43:13,217 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 13:43:13,217 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-04 13:43:13,217 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-04 13:43:13,217 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-04 13:43:13,218 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-04 13:43:13,218 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 13:43:13,218 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-04 13:43:13,218 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-09-04 13:43:13,713 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 13:43:13,739 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 13:43:13,745 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 13:43:13,747 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 13:43:13,748 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 13:43:13,749 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02.i [2020-09-04 13:43:13,845 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6f15168a8/1c808fc8d5474554b487ad271a420d30/FLAG80ff689db [2020-09-04 13:43:14,436 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 13:43:14,436 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/sum01_bug02.i [2020-09-04 13:43:14,445 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6f15168a8/1c808fc8d5474554b487ad271a420d30/FLAG80ff689db [2020-09-04 13:43:14,794 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6f15168a8/1c808fc8d5474554b487ad271a420d30 [2020-09-04 13:43:14,809 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 13:43:14,812 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 13:43:14,813 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 13:43:14,813 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 13:43:14,818 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 13:43:14,819 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:43:14" (1/1) ... [2020-09-04 13:43:14,823 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@738c6f70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:14, skipping insertion in model container [2020-09-04 13:43:14,823 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:43:14" (1/1) ... [2020-09-04 13:43:14,832 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 13:43:14,854 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 13:43:15,082 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:43:15,086 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 13:43:15,103 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:43:15,120 INFO L208 MainTranslator]: Completed translation [2020-09-04 13:43:15,121 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:15 WrapperNode [2020-09-04 13:43:15,121 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 13:43:15,122 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 13:43:15,122 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 13:43:15,122 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 13:43:15,135 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:15" (1/1) ... [2020-09-04 13:43:15,136 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:15" (1/1) ... [2020-09-04 13:43:15,223 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:15" (1/1) ... [2020-09-04 13:43:15,224 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:15" (1/1) ... [2020-09-04 13:43:15,229 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:15" (1/1) ... [2020-09-04 13:43:15,237 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:15" (1/1) ... [2020-09-04 13:43:15,238 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:15" (1/1) ... [2020-09-04 13:43:15,239 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 13:43:15,240 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 13:43:15,240 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 13:43:15,240 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 13:43:15,241 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:15" (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 [2020-09-04 13:43:15,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 13:43:15,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 13:43:15,326 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 13:43:15,326 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 13:43:15,326 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 13:43:15,326 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 13:43:15,326 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-09-04 13:43:15,326 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 13:43:15,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 13:43:15,327 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 13:43:15,546 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 13:43:15,547 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-04 13:43:15,551 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:43:15 BoogieIcfgContainer [2020-09-04 13:43:15,551 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 13:43:15,553 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 13:43:15,554 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 13:43:15,557 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 13:43:15,558 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 01:43:14" (1/3) ... [2020-09-04 13:43:15,559 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3238643b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:43:15, skipping insertion in model container [2020-09-04 13:43:15,560 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:15" (2/3) ... [2020-09-04 13:43:15,560 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3238643b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:43:15, skipping insertion in model container [2020-09-04 13:43:15,560 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:43:15" (3/3) ... [2020-09-04 13:43:15,562 INFO L109 eAbstractionObserver]: Analyzing ICFG sum01_bug02.i [2020-09-04 13:43:15,575 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-09-04 13:43:15,585 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 13:43:15,609 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 13:43:15,646 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 13:43:15,647 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 13:43:15,647 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-09-04 13:43:15,647 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 13:43:15,647 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 13:43:15,647 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 13:43:15,647 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 13:43:15,648 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 13:43:15,681 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-09-04 13:43:15,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-09-04 13:43:15,690 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:15,691 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:15,692 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:15,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:15,702 INFO L82 PathProgramCache]: Analyzing trace with hash -146959038, now seen corresponding path program 1 times [2020-09-04 13:43:15,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:15,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22655272] [2020-09-04 13:43:15,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:15,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:15,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:15,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:15,888 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:15,889 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22655272] [2020-09-04 13:43:15,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:43:15,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-09-04 13:43:15,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040872836] [2020-09-04 13:43:15,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-09-04 13:43:15,899 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:15,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-09-04 13:43:15,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-04 13:43:15,920 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-09-04 13:43:15,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:15,949 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2020-09-04 13:43:15,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-09-04 13:43:15,951 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-09-04 13:43:15,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:15,962 INFO L225 Difference]: With dead ends: 31 [2020-09-04 13:43:15,962 INFO L226 Difference]: Without dead ends: 14 [2020-09-04 13:43:15,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-09-04 13:43:15,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-09-04 13:43:16,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-09-04 13:43:16,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-09-04 13:43:16,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-09-04 13:43:16,015 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2020-09-04 13:43:16,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:16,016 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-09-04 13:43:16,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-09-04 13:43:16,016 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-09-04 13:43:16,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-09-04 13:43:16,017 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:16,017 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:16,018 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 13:43:16,018 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:16,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:16,018 INFO L82 PathProgramCache]: Analyzing trace with hash -158964811, now seen corresponding path program 1 times [2020-09-04 13:43:16,019 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:16,019 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440171538] [2020-09-04 13:43:16,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:16,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:16,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:16,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:16,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:16,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440171538] [2020-09-04 13:43:16,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:43:16,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 13:43:16,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015096299] [2020-09-04 13:43:16,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 13:43:16,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:16,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 13:43:16,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 13:43:16,142 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2020-09-04 13:43:16,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:16,216 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2020-09-04 13:43:16,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 13:43:16,217 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-09-04 13:43:16,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:16,218 INFO L225 Difference]: With dead ends: 23 [2020-09-04 13:43:16,218 INFO L226 Difference]: Without dead ends: 18 [2020-09-04 13:43:16,219 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 13:43:16,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-09-04 13:43:16,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-09-04 13:43:16,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-09-04 13:43:16,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-09-04 13:43:16,226 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 10 [2020-09-04 13:43:16,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:16,226 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-09-04 13:43:16,227 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 13:43:16,227 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-09-04 13:43:16,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-09-04 13:43:16,228 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:16,228 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:16,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 13:43:16,229 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:16,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:16,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1017948080, now seen corresponding path program 1 times [2020-09-04 13:43:16,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:16,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921252616] [2020-09-04 13:43:16,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:16,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:16,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:16,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:16,564 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:16,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921252616] [2020-09-04 13:43:16,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1042893782] [2020-09-04 13:43:16,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:16,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:16,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 12 conjunts are in the unsatisfiable core [2020-09-04 13:43:16,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:16,844 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-09-04 13:43:16,909 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:16,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:16,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2020-09-04 13:43:16,911 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272291381] [2020-09-04 13:43:16,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-04 13:43:16,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:16,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-04 13:43:16,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2020-09-04 13:43:16,913 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 16 states. [2020-09-04 13:43:17,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:17,156 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-09-04 13:43:17,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-04 13:43:17,156 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 14 [2020-09-04 13:43:17,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:17,160 INFO L225 Difference]: With dead ends: 40 [2020-09-04 13:43:17,160 INFO L226 Difference]: Without dead ends: 34 [2020-09-04 13:43:17,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2020-09-04 13:43:17,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-09-04 13:43:17,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 27. [2020-09-04 13:43:17,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-09-04 13:43:17,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-09-04 13:43:17,169 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 14 [2020-09-04 13:43:17,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:17,169 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-09-04 13:43:17,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-04 13:43:17,169 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-09-04 13:43:17,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-09-04 13:43:17,170 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:17,171 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:17,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-09-04 13:43:17,386 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:17,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:17,387 INFO L82 PathProgramCache]: Analyzing trace with hash -852639511, now seen corresponding path program 1 times [2020-09-04 13:43:17,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:17,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820553402] [2020-09-04 13:43:17,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:17,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:17,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:17,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:17,417 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-09-04 13:43:17,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820553402] [2020-09-04 13:43:17,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:43:17,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-04 13:43:17,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [767344907] [2020-09-04 13:43:17,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-04 13:43:17,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:17,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-04 13:43:17,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 13:43:17,419 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 3 states. [2020-09-04 13:43:17,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:17,436 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2020-09-04 13:43:17,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-04 13:43:17,437 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-09-04 13:43:17,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:17,438 INFO L225 Difference]: With dead ends: 36 [2020-09-04 13:43:17,438 INFO L226 Difference]: Without dead ends: 23 [2020-09-04 13:43:17,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 13:43:17,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-09-04 13:43:17,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-09-04 13:43:17,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-09-04 13:43:17,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-09-04 13:43:17,444 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 18 [2020-09-04 13:43:17,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:17,444 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-09-04 13:43:17,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-04 13:43:17,445 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-09-04 13:43:17,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-09-04 13:43:17,445 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:17,446 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:17,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 13:43:17,446 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:17,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:17,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1920151575, now seen corresponding path program 2 times [2020-09-04 13:43:17,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:17,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1665995925] [2020-09-04 13:43:17,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:17,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:17,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:17,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:17,498 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:17,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1665995925] [2020-09-04 13:43:17,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235787680] [2020-09-04 13:43:17,499 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:17,533 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-09-04 13:43:17,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:17,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 5 conjunts are in the unsatisfiable core [2020-09-04 13:43:17,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:17,598 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:17,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:17,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-09-04 13:43:17,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358019886] [2020-09-04 13:43:17,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 13:43:17,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:17,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 13:43:17,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2020-09-04 13:43:17,600 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 8 states. [2020-09-04 13:43:17,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:17,647 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-09-04 13:43:17,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 13:43:17,647 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-09-04 13:43:17,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:17,648 INFO L225 Difference]: With dead ends: 32 [2020-09-04 13:43:17,648 INFO L226 Difference]: Without dead ends: 23 [2020-09-04 13:43:17,649 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=31, Unknown=0, NotChecked=0, Total=56 [2020-09-04 13:43:17,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-09-04 13:43:17,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-09-04 13:43:17,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-09-04 13:43:17,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-09-04 13:43:17,654 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 18 [2020-09-04 13:43:17,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:17,655 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-09-04 13:43:17,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 13:43:17,655 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-09-04 13:43:17,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-04 13:43:17,656 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:17,656 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:17,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:17,869 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:17,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:17,870 INFO L82 PathProgramCache]: Analyzing trace with hash -1780946716, now seen corresponding path program 3 times [2020-09-04 13:43:17,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:17,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374535364] [2020-09-04 13:43:17,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:17,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:17,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:17,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:17,971 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:17,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [374535364] [2020-09-04 13:43:17,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498285648] [2020-09-04 13:43:17,972 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:18,020 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-09-04 13:43:18,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:18,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 7 conjunts are in the unsatisfiable core [2020-09-04 13:43:18,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:18,116 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:18,117 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:18,117 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-09-04 13:43:18,118 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308740530] [2020-09-04 13:43:18,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-04 13:43:18,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:18,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-04 13:43:18,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=76, Unknown=0, NotChecked=0, Total=132 [2020-09-04 13:43:18,119 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 12 states. [2020-09-04 13:43:18,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:18,181 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-09-04 13:43:18,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 13:43:18,182 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-09-04 13:43:18,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:18,182 INFO L225 Difference]: With dead ends: 34 [2020-09-04 13:43:18,182 INFO L226 Difference]: Without dead ends: 25 [2020-09-04 13:43:18,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=76, Unknown=0, NotChecked=0, Total=132 [2020-09-04 13:43:18,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-09-04 13:43:18,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2020-09-04 13:43:18,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-09-04 13:43:18,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-09-04 13:43:18,188 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2020-09-04 13:43:18,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:18,189 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-09-04 13:43:18,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-04 13:43:18,189 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-09-04 13:43:18,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-04 13:43:18,190 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:18,190 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:18,395 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:18,396 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:18,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:18,396 INFO L82 PathProgramCache]: Analyzing trace with hash -971600090, now seen corresponding path program 2 times [2020-09-04 13:43:18,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:18,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [316395535] [2020-09-04 13:43:18,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:18,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:18,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:18,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:18,662 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-09-04 13:43:18,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [316395535] [2020-09-04 13:43:18,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [647954571] [2020-09-04 13:43:18,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:18,692 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-09-04 13:43:18,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:18,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 20 conjunts are in the unsatisfiable core [2020-09-04 13:43:18,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:18,970 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-09-04 13:43:19,026 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:19,027 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:19,027 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 21 [2020-09-04 13:43:19,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836565244] [2020-09-04 13:43:19,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-04 13:43:19,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:19,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-04 13:43:19,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=358, Unknown=0, NotChecked=0, Total=420 [2020-09-04 13:43:19,029 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 21 states. [2020-09-04 13:43:19,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:19,570 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-09-04 13:43:19,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-09-04 13:43:19,575 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 22 [2020-09-04 13:43:19,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:19,576 INFO L225 Difference]: With dead ends: 42 [2020-09-04 13:43:19,576 INFO L226 Difference]: Without dead ends: 36 [2020-09-04 13:43:19,577 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=163, Invalid=1027, Unknown=0, NotChecked=0, Total=1190 [2020-09-04 13:43:19,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-09-04 13:43:19,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 28. [2020-09-04 13:43:19,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-04 13:43:19,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-09-04 13:43:19,589 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 22 [2020-09-04 13:43:19,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:19,589 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-09-04 13:43:19,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-04 13:43:19,593 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-09-04 13:43:19,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-09-04 13:43:19,594 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:19,594 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:19,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:19,808 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:19,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:19,808 INFO L82 PathProgramCache]: Analyzing trace with hash -131462049, now seen corresponding path program 4 times [2020-09-04 13:43:19,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:19,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250101552] [2020-09-04 13:43:19,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:19,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:19,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:19,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:19,896 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:19,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250101552] [2020-09-04 13:43:19,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012028506] [2020-09-04 13:43:19,899 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2020-09-04 13:43:19,934 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-09-04 13:43:19,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:19,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 9 conjunts are in the unsatisfiable core [2020-09-04 13:43:19,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:20,072 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:20,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:20,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2020-09-04 13:43:20,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [11238377] [2020-09-04 13:43:20,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-04 13:43:20,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:20,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-04 13:43:20,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=141, Unknown=0, NotChecked=0, Total=240 [2020-09-04 13:43:20,074 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 16 states. [2020-09-04 13:43:20,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:20,182 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-09-04 13:43:20,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 13:43:20,183 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 26 [2020-09-04 13:43:20,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:20,184 INFO L225 Difference]: With dead ends: 42 [2020-09-04 13:43:20,185 INFO L226 Difference]: Without dead ends: 33 [2020-09-04 13:43:20,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=99, Invalid=141, Unknown=0, NotChecked=0, Total=240 [2020-09-04 13:43:20,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-09-04 13:43:20,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2020-09-04 13:43:20,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-04 13:43:20,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-09-04 13:43:20,190 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 26 [2020-09-04 13:43:20,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:20,191 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-09-04 13:43:20,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-04 13:43:20,191 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-09-04 13:43:20,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-09-04 13:43:20,192 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:20,192 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:20,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:20,399 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:20,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:20,399 INFO L82 PathProgramCache]: Analyzing trace with hash -1107887526, now seen corresponding path program 5 times [2020-09-04 13:43:20,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:20,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504992888] [2020-09-04 13:43:20,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:20,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:20,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:20,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:20,517 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:20,517 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504992888] [2020-09-04 13:43:20,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1872833425] [2020-09-04 13:43:20,518 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:20,547 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-09-04 13:43:20,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:20,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 11 conjunts are in the unsatisfiable core [2020-09-04 13:43:20,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:20,726 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:20,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:20,726 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-09-04 13:43:20,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685651061] [2020-09-04 13:43:20,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-09-04 13:43:20,727 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:20,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-09-04 13:43:20,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=226, Unknown=0, NotChecked=0, Total=380 [2020-09-04 13:43:20,728 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 20 states. [2020-09-04 13:43:20,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:20,835 INFO L93 Difference]: Finished difference Result 47 states and 51 transitions. [2020-09-04 13:43:20,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-04 13:43:20,838 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 30 [2020-09-04 13:43:20,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:20,839 INFO L225 Difference]: With dead ends: 47 [2020-09-04 13:43:20,839 INFO L226 Difference]: Without dead ends: 38 [2020-09-04 13:43:20,839 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=154, Invalid=226, Unknown=0, NotChecked=0, Total=380 [2020-09-04 13:43:20,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-09-04 13:43:20,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-09-04 13:43:20,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-09-04 13:43:20,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-09-04 13:43:20,845 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 30 [2020-09-04 13:43:20,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:20,846 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-09-04 13:43:20,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-09-04 13:43:20,846 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-09-04 13:43:20,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-04 13:43:20,847 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:20,847 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:21,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:21,060 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:21,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:21,060 INFO L82 PathProgramCache]: Analyzing trace with hash -682200363, now seen corresponding path program 6 times [2020-09-04 13:43:21,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:21,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [735491471] [2020-09-04 13:43:21,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:21,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:43:21,086 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:43:21,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:43:21,104 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:43:21,124 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-09-04 13:43:21,124 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 13:43:21,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-04 13:43:21,163 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 01:43:21 BoogieIcfgContainer [2020-09-04 13:43:21,163 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 13:43:21,166 INFO L168 Benchmark]: Toolchain (without parser) took 6353.84 ms. Allocated memory was 147.8 MB in the beginning and 246.4 MB in the end (delta: 98.6 MB). Free memory was 103.9 MB in the beginning and 154.4 MB in the end (delta: -50.6 MB). Peak memory consumption was 48.0 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:21,167 INFO L168 Benchmark]: CDTParser took 0.54 ms. Allocated memory is still 147.8 MB. Free memory was 122.3 MB in the beginning and 122.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-09-04 13:43:21,168 INFO L168 Benchmark]: CACSL2BoogieTranslator took 308.66 ms. Allocated memory is still 147.8 MB. Free memory was 103.6 MB in the beginning and 94.2 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:21,169 INFO L168 Benchmark]: Boogie Preprocessor took 117.32 ms. Allocated memory was 147.8 MB in the beginning and 202.9 MB in the end (delta: 55.1 MB). Free memory was 94.2 MB in the beginning and 181.9 MB in the end (delta: -87.7 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:21,170 INFO L168 Benchmark]: RCFGBuilder took 312.04 ms. Allocated memory is still 202.9 MB. Free memory was 181.3 MB in the beginning and 169.1 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:21,171 INFO L168 Benchmark]: TraceAbstraction took 5609.61 ms. Allocated memory was 202.9 MB in the beginning and 246.4 MB in the end (delta: 43.5 MB). Free memory was 168.5 MB in the beginning and 154.4 MB in the end (delta: 14.0 MB). Peak memory consumption was 57.5 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:21,174 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.54 ms. Allocated memory is still 147.8 MB. Free memory was 122.3 MB in the beginning and 122.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 308.66 ms. Allocated memory is still 147.8 MB. Free memory was 103.6 MB in the beginning and 94.2 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 117.32 ms. Allocated memory was 147.8 MB in the beginning and 202.9 MB in the end (delta: 55.1 MB). Free memory was 94.2 MB in the beginning and 181.9 MB in the end (delta: -87.7 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 312.04 ms. Allocated memory is still 202.9 MB. Free memory was 181.3 MB in the beginning and 169.1 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5609.61 ms. Allocated memory was 202.9 MB in the beginning and 246.4 MB in the end (delta: 43.5 MB). Free memory was 168.5 MB in the beginning and 154.4 MB in the end (delta: 14.0 MB). Peak memory consumption was 57.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L13] i=1 VAL [i=1, j=10, n=6, n=0] [L13] COND TRUE i<=n VAL [i=1, j=10, n=0, n=6] [L14] COND TRUE i