/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/array-examples/standard_find_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:43:07,771 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:43:07,774 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:43:07,786 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:43:07,787 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:43:07,788 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:43:07,789 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:43:07,791 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:43:07,793 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:43:07,794 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:43:07,795 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:43:07,796 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:43:07,796 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:43:07,797 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:43:07,798 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:43:07,799 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:43:07,800 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:43:07,801 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:43:07,803 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:43:07,805 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:43:07,806 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:43:07,808 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:43:07,809 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:43:07,810 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:43:07,812 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-06 18:43:07,812 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-06 18:43:07,812 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-06 18:43:07,813 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-06 18:43:07,814 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-06 18:43:07,815 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-06 18:43:07,815 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-06 18:43:07,816 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-06 18:43:07,817 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-06 18:43:07,817 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-06 18:43:07,818 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-06 18:43:07,819 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-06 18:43:07,819 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-06 18:43:07,819 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-06 18:43:07,820 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:43:07,822 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:43:07,823 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:43:07,823 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-06 18:43:07,848 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:43:07,849 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:43:07,850 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:43:07,851 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:43:07,851 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:43:07,851 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:43:07,851 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:43:07,852 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:43:07,852 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:43:07,852 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:43:07,853 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:43:07,853 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:43:07,853 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:43:07,854 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:43:07,854 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:43:07,854 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:43:07,855 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:43:07,855 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:43:07,855 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:43:07,855 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:43:07,856 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:43:07,856 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:43:07,856 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:43:07,856 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:43:07,857 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:43:07,857 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:43:07,857 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:43:07,857 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:43:07,857 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:43:08,173 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:43:08,194 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:43:08,199 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:43:08,200 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:43:08,201 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:43:08,201 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_find_ground-1.i [2019-11-06 18:43:08,272 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ecf3e4aaf/33c104aafe744469920ce0dfd8783c8d/FLAG83131fc3e [2019-11-06 18:43:08,752 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:43:08,752 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_find_ground-1.i [2019-11-06 18:43:08,759 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ecf3e4aaf/33c104aafe744469920ce0dfd8783c8d/FLAG83131fc3e [2019-11-06 18:43:09,116 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ecf3e4aaf/33c104aafe744469920ce0dfd8783c8d [2019-11-06 18:43:09,124 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:43:09,125 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:43:09,126 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:43:09,127 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:43:09,130 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:43:09,137 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:43:09" (1/1) ... [2019-11-06 18:43:09,140 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66cdbb26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:09, skipping insertion in model container [2019-11-06 18:43:09,140 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:43:09" (1/1) ... [2019-11-06 18:43:09,148 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:43:09,166 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:43:09,343 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:43:09,348 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:43:09,372 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:43:09,396 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:43:09,397 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:09 WrapperNode [2019-11-06 18:43:09,398 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:43:09,399 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:43:09,399 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:43:09,399 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:43:09,500 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:09" (1/1) ... [2019-11-06 18:43:09,501 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:09" (1/1) ... [2019-11-06 18:43:09,510 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:09" (1/1) ... [2019-11-06 18:43:09,514 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:09" (1/1) ... [2019-11-06 18:43:09,521 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:09" (1/1) ... [2019-11-06 18:43:09,529 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:09" (1/1) ... [2019-11-06 18:43:09,536 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:09" (1/1) ... [2019-11-06 18:43:09,539 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:43:09,540 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:43:09,540 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:43:09,540 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:43:09,541 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2019-11-06 18:43:09,600 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:43:09,600 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:43:09,600 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:43:09,600 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:43:09,601 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:43:09,601 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 18:43:09,601 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:43:09,601 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:43:09,601 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:43:09,601 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:43:09,602 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:43:09,602 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:43:09,602 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:43:09,602 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:43:09,850 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:43:09,850 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-06 18:43:09,852 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:43:09 BoogieIcfgContainer [2019-11-06 18:43:09,852 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:43:09,853 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:43:09,853 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:43:09,856 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:43:09,857 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:43:09" (1/3) ... [2019-11-06 18:43:09,857 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c66d2a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:43:09, skipping insertion in model container [2019-11-06 18:43:09,858 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:09" (2/3) ... [2019-11-06 18:43:09,858 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1c66d2a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:43:09, skipping insertion in model container [2019-11-06 18:43:09,858 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:43:09" (3/3) ... [2019-11-06 18:43:09,860 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_find_ground-1.i [2019-11-06 18:43:09,872 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:43:09,880 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:43:09,894 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:43:09,922 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:43:09,922 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:43:09,922 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:43:09,922 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:43:09,923 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:43:09,923 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:43:09,923 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:43:09,923 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:43:09,943 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-11-06 18:43:09,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-06 18:43:09,950 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:09,952 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:09,954 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:09,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:09,959 INFO L82 PathProgramCache]: Analyzing trace with hash -1063635089, now seen corresponding path program 1 times [2019-11-06 18:43:09,969 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:09,969 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502325246] [2019-11-06 18:43:09,969 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:10,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:10,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:10,154 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:10,154 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502325246] [2019-11-06 18:43:10,155 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:43:10,156 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:43:10,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432974703] [2019-11-06 18:43:10,165 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:43:10,166 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:10,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:43:10,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:43:10,185 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-11-06 18:43:10,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:10,291 INFO L93 Difference]: Finished difference Result 46 states and 59 transitions. [2019-11-06 18:43:10,296 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:43:10,298 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-11-06 18:43:10,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:10,311 INFO L225 Difference]: With dead ends: 46 [2019-11-06 18:43:10,311 INFO L226 Difference]: Without dead ends: 22 [2019-11-06 18:43:10,322 INFO L630 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 [2019-11-06 18:43:10,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-06 18:43:10,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-06 18:43:10,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-06 18:43:10,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2019-11-06 18:43:10,361 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2019-11-06 18:43:10,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:10,362 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2019-11-06 18:43:10,362 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:43:10,362 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2019-11-06 18:43:10,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 18:43:10,363 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:10,363 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:10,364 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:10,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:10,364 INFO L82 PathProgramCache]: Analyzing trace with hash -977598642, now seen corresponding path program 1 times [2019-11-06 18:43:10,365 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:10,365 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1192260218] [2019-11-06 18:43:10,365 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:10,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:10,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:10,461 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:10,461 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1192260218] [2019-11-06 18:43:10,462 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:43:10,462 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:43:10,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872004182] [2019-11-06 18:43:10,466 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:43:10,467 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:10,467 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:43:10,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:43:10,468 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 4 states. [2019-11-06 18:43:10,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:10,572 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2019-11-06 18:43:10,573 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:43:10,573 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-11-06 18:43:10,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:10,574 INFO L225 Difference]: With dead ends: 38 [2019-11-06 18:43:10,574 INFO L226 Difference]: Without dead ends: 24 [2019-11-06 18:43:10,575 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:43:10,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-06 18:43:10,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-11-06 18:43:10,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-06 18:43:10,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2019-11-06 18:43:10,583 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 16 [2019-11-06 18:43:10,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:10,583 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2019-11-06 18:43:10,584 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:43:10,584 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2019-11-06 18:43:10,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-06 18:43:10,585 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:10,585 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:10,585 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:10,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:10,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1311771152, now seen corresponding path program 1 times [2019-11-06 18:43:10,586 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:10,586 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [969413458] [2019-11-06 18:43:10,587 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:10,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:10,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:10,711 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:43:10,711 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [969413458] [2019-11-06 18:43:10,711 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:43:10,712 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-06 18:43:10,712 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940055440] [2019-11-06 18:43:10,713 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 18:43:10,713 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:10,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 18:43:10,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-06 18:43:10,714 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 5 states. [2019-11-06 18:43:10,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:10,792 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2019-11-06 18:43:10,793 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:43:10,793 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2019-11-06 18:43:10,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:10,794 INFO L225 Difference]: With dead ends: 38 [2019-11-06 18:43:10,794 INFO L226 Difference]: Without dead ends: 26 [2019-11-06 18:43:10,795 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-06 18:43:10,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-06 18:43:10,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-06 18:43:10,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-06 18:43:10,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2019-11-06 18:43:10,801 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 18 [2019-11-06 18:43:10,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:10,802 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2019-11-06 18:43:10,802 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 18:43:10,802 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2019-11-06 18:43:10,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-06 18:43:10,803 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:10,803 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:10,803 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:10,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:10,804 INFO L82 PathProgramCache]: Analyzing trace with hash 605671840, now seen corresponding path program 1 times [2019-11-06 18:43:10,804 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:10,804 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [627374219] [2019-11-06 18:43:10,805 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:10,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:10,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:10,889 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:43:10,894 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [627374219] [2019-11-06 18:43:10,895 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198466997] [2019-11-06 18:43:10,895 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/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 [2019-11-06 18:43:10,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:10,973 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:43:10,981 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:11,024 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:43:11,025 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:11,025 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 18:43:11,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341474518] [2019-11-06 18:43:11,026 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:43:11,026 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:11,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:43:11,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:43:11,027 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 6 states. [2019-11-06 18:43:11,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:11,115 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2019-11-06 18:43:11,116 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:43:11,116 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2019-11-06 18:43:11,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:11,117 INFO L225 Difference]: With dead ends: 46 [2019-11-06 18:43:11,117 INFO L226 Difference]: Without dead ends: 29 [2019-11-06 18:43:11,118 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:43:11,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-11-06 18:43:11,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2019-11-06 18:43:11,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-06 18:43:11,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2019-11-06 18:43:11,124 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 21 [2019-11-06 18:43:11,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:11,124 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2019-11-06 18:43:11,124 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:43:11,124 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2019-11-06 18:43:11,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 18:43:11,125 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:11,125 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:11,329 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:11,330 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:11,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:11,331 INFO L82 PathProgramCache]: Analyzing trace with hash -631588802, now seen corresponding path program 2 times [2019-11-06 18:43:11,331 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:11,332 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098620654] [2019-11-06 18:43:11,332 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:11,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:11,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:11,475 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:43:11,476 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098620654] [2019-11-06 18:43:11,476 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1619715751] [2019-11-06 18:43:11,476 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/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 [2019-11-06 18:43:11,544 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:11,544 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:11,545 INFO L256 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:43:11,547 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:11,566 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:43:11,566 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:11,567 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 18:43:11,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343748336] [2019-11-06 18:43:11,567 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:43:11,568 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:11,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:43:11,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:43:11,568 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 7 states. [2019-11-06 18:43:11,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:11,652 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2019-11-06 18:43:11,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:43:11,653 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-11-06 18:43:11,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:11,653 INFO L225 Difference]: With dead ends: 48 [2019-11-06 18:43:11,654 INFO L226 Difference]: Without dead ends: 31 [2019-11-06 18:43:11,655 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:43:11,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-06 18:43:11,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2019-11-06 18:43:11,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-06 18:43:11,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2019-11-06 18:43:11,661 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 23 [2019-11-06 18:43:11,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:11,662 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2019-11-06 18:43:11,662 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:43:11,662 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2019-11-06 18:43:11,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-06 18:43:11,663 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:11,663 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:11,866 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:11,866 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:11,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:11,867 INFO L82 PathProgramCache]: Analyzing trace with hash 66875228, now seen corresponding path program 3 times [2019-11-06 18:43:11,868 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:11,869 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [118646279] [2019-11-06 18:43:11,869 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:11,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:11,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:11,958 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:43:11,958 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [118646279] [2019-11-06 18:43:11,958 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1007134416] [2019-11-06 18:43:11,959 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/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 [2019-11-06 18:43:11,998 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-06 18:43:11,998 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:12,000 INFO L256 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 18:43:12,002 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:12,136 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-11-06 18:43:12,137 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:43:12,140 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:43:12,141 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:43:12,141 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-11-06 18:43:12,161 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:43:12,204 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:43:12,205 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:12,205 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 14 [2019-11-06 18:43:12,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171966667] [2019-11-06 18:43:12,206 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 18:43:12,206 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:12,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 18:43:12,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:43:12,207 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 14 states. [2019-11-06 18:43:12,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:12,578 INFO L93 Difference]: Finished difference Result 67 states and 79 transitions. [2019-11-06 18:43:12,579 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:43:12,579 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 25 [2019-11-06 18:43:12,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:12,582 INFO L225 Difference]: With dead ends: 67 [2019-11-06 18:43:12,582 INFO L226 Difference]: Without dead ends: 50 [2019-11-06 18:43:12,583 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:43:12,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-06 18:43:12,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 43. [2019-11-06 18:43:12,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-06 18:43:12,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2019-11-06 18:43:12,596 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 25 [2019-11-06 18:43:12,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:12,597 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2019-11-06 18:43:12,597 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 18:43:12,597 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2019-11-06 18:43:12,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-06 18:43:12,598 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:12,598 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:12,802 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:12,803 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:12,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:12,804 INFO L82 PathProgramCache]: Analyzing trace with hash 1976974460, now seen corresponding path program 1 times [2019-11-06 18:43:12,804 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:12,804 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090797959] [2019-11-06 18:43:12,804 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:12,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:12,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:12,845 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:43:12,846 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090797959] [2019-11-06 18:43:12,846 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:43:12,846 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:43:12,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903680559] [2019-11-06 18:43:12,847 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:43:12,847 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:12,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:43:12,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:43:12,848 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand 4 states. [2019-11-06 18:43:12,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:12,894 INFO L93 Difference]: Finished difference Result 64 states and 73 transitions. [2019-11-06 18:43:12,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:43:12,895 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 27 [2019-11-06 18:43:12,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:12,897 INFO L225 Difference]: With dead ends: 64 [2019-11-06 18:43:12,897 INFO L226 Difference]: Without dead ends: 39 [2019-11-06 18:43:12,898 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:43:12,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-11-06 18:43:12,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2019-11-06 18:43:12,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-06 18:43:12,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2019-11-06 18:43:12,913 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 27 [2019-11-06 18:43:12,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:12,914 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2019-11-06 18:43:12,914 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:43:12,914 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2019-11-06 18:43:12,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-06 18:43:12,915 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:12,915 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:12,916 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:12,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:12,916 INFO L82 PathProgramCache]: Analyzing trace with hash 107032625, now seen corresponding path program 1 times [2019-11-06 18:43:12,916 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:12,916 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523366983] [2019-11-06 18:43:12,917 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:12,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:12,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:12,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:12,996 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:43:12,997 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523366983] [2019-11-06 18:43:12,997 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1111452346] [2019-11-06 18:43:12,997 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/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 [2019-11-06 18:43:13,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:13,045 INFO L256 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:43:13,047 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:13,121 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-06 18:43:13,122 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:13,123 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2019-11-06 18:43:13,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294213234] [2019-11-06 18:43:13,124 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:43:13,124 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:13,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:43:13,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:43:13,125 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 12 states. [2019-11-06 18:43:13,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:13,287 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2019-11-06 18:43:13,287 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:43:13,287 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 35 [2019-11-06 18:43:13,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:13,289 INFO L225 Difference]: With dead ends: 76 [2019-11-06 18:43:13,289 INFO L226 Difference]: Without dead ends: 45 [2019-11-06 18:43:13,289 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=224, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:43:13,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-11-06 18:43:13,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2019-11-06 18:43:13,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-11-06 18:43:13,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2019-11-06 18:43:13,296 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 35 [2019-11-06 18:43:13,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:13,297 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2019-11-06 18:43:13,297 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:43:13,297 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2019-11-06 18:43:13,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-11-06 18:43:13,298 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:13,298 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:13,509 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:13,510 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:13,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:13,511 INFO L82 PathProgramCache]: Analyzing trace with hash 1471316655, now seen corresponding path program 2 times [2019-11-06 18:43:13,511 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:13,512 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013523003] [2019-11-06 18:43:13,512 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:13,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:13,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:13,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:13,608 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2019-11-06 18:43:13,608 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013523003] [2019-11-06 18:43:13,609 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [642450821] [2019-11-06 18:43:13,609 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:13,657 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:13,658 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:13,658 INFO L256 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:43:13,661 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:13,675 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-11-06 18:43:13,675 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:13,675 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-11-06 18:43:13,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483691103] [2019-11-06 18:43:13,676 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 18:43:13,676 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:13,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 18:43:13,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:43:13,677 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 10 states. [2019-11-06 18:43:13,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:13,751 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2019-11-06 18:43:13,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 18:43:13,751 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 40 [2019-11-06 18:43:13,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:13,752 INFO L225 Difference]: With dead ends: 74 [2019-11-06 18:43:13,753 INFO L226 Difference]: Without dead ends: 47 [2019-11-06 18:43:13,753 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:43:13,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-06 18:43:13,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-11-06 18:43:13,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-06 18:43:13,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2019-11-06 18:43:13,760 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 40 [2019-11-06 18:43:13,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:13,760 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2019-11-06 18:43:13,761 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 18:43:13,761 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2019-11-06 18:43:13,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-06 18:43:13,762 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:13,762 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:13,966 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:13,967 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:13,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:13,967 INFO L82 PathProgramCache]: Analyzing trace with hash -705811631, now seen corresponding path program 3 times [2019-11-06 18:43:13,968 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:13,968 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1911466060] [2019-11-06 18:43:13,969 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:14,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:14,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:14,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:14,078 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2019-11-06 18:43:14,078 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1911466060] [2019-11-06 18:43:14,078 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [592623713] [2019-11-06 18:43:14,079 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/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 [2019-11-06 18:43:14,131 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:43:14,131 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:14,132 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 18:43:14,146 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:14,281 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-11-06 18:43:14,281 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:43:14,283 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:43:14,284 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:43:14,284 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-11-06 18:43:14,298 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:43:14,329 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:43:14,329 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:14,330 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 19 [2019-11-06 18:43:14,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807406154] [2019-11-06 18:43:14,330 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:43:14,331 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:14,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:43:14,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:43:14,331 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 19 states. [2019-11-06 18:43:14,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:14,845 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2019-11-06 18:43:14,846 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 18:43:14,846 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2019-11-06 18:43:14,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:14,846 INFO L225 Difference]: With dead ends: 86 [2019-11-06 18:43:14,847 INFO L226 Difference]: Without dead ends: 59 [2019-11-06 18:43:14,848 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=147, Invalid=723, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:43:14,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-11-06 18:43:14,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2019-11-06 18:43:14,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-11-06 18:43:14,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2019-11-06 18:43:14,855 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 42 [2019-11-06 18:43:14,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:14,855 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2019-11-06 18:43:14,855 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:43:14,855 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2019-11-06 18:43:14,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-11-06 18:43:14,856 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:14,857 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:15,068 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:15,068 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:15,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:15,069 INFO L82 PathProgramCache]: Analyzing trace with hash 1970471850, now seen corresponding path program 4 times [2019-11-06 18:43:15,069 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:15,070 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160022393] [2019-11-06 18:43:15,070 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:15,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:15,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:15,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:15,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:15,199 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 4 proven. 49 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-06 18:43:15,199 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160022393] [2019-11-06 18:43:15,199 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873656297] [2019-11-06 18:43:15,199 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:15,267 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:15,267 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:15,268 INFO L256 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:43:15,271 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:15,294 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:43:15,295 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:15,295 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 18:43:15,295 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35746373] [2019-11-06 18:43:15,296 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:43:15,296 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:15,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:43:15,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:43:15,296 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand 12 states. [2019-11-06 18:43:15,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:15,390 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2019-11-06 18:43:15,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:43:15,391 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 52 [2019-11-06 18:43:15,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:15,392 INFO L225 Difference]: With dead ends: 94 [2019-11-06 18:43:15,392 INFO L226 Difference]: Without dead ends: 59 [2019-11-06 18:43:15,392 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:43:15,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-11-06 18:43:15,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2019-11-06 18:43:15,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-11-06 18:43:15,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2019-11-06 18:43:15,400 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 52 [2019-11-06 18:43:15,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:15,400 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2019-11-06 18:43:15,400 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:43:15,400 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2019-11-06 18:43:15,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2019-11-06 18:43:15,401 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:15,401 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:15,605 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:15,606 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:15,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:15,606 INFO L82 PathProgramCache]: Analyzing trace with hash 1583139148, now seen corresponding path program 5 times [2019-11-06 18:43:15,606 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:15,607 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267714593] [2019-11-06 18:43:15,607 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:15,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:15,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:15,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:15,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:15,725 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 4 proven. 64 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-06 18:43:15,725 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267714593] [2019-11-06 18:43:15,725 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1683021261] [2019-11-06 18:43:15,726 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:15,811 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 9 check-sat command(s) [2019-11-06 18:43:15,811 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:15,812 INFO L256 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:43:15,815 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:15,840 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:43:15,840 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:15,840 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 18:43:15,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320497566] [2019-11-06 18:43:15,841 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 18:43:15,841 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:15,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 18:43:15,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:43:15,842 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand 13 states. [2019-11-06 18:43:15,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:15,937 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2019-11-06 18:43:15,937 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:43:15,938 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 54 [2019-11-06 18:43:15,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:15,938 INFO L225 Difference]: With dead ends: 96 [2019-11-06 18:43:15,939 INFO L226 Difference]: Without dead ends: 61 [2019-11-06 18:43:15,939 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:43:15,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-11-06 18:43:15,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2019-11-06 18:43:15,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-11-06 18:43:15,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2019-11-06 18:43:15,949 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 54 [2019-11-06 18:43:15,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:15,949 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2019-11-06 18:43:15,950 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 18:43:15,950 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2019-11-06 18:43:15,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-11-06 18:43:15,951 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:15,951 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:16,151 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:16,152 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:16,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:16,152 INFO L82 PathProgramCache]: Analyzing trace with hash -1276400018, now seen corresponding path program 6 times [2019-11-06 18:43:16,153 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:16,153 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603896107] [2019-11-06 18:43:16,153 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:16,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:16,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:16,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:16,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:16,278 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 4 proven. 81 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-06 18:43:16,279 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603896107] [2019-11-06 18:43:16,279 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305035399] [2019-11-06 18:43:16,279 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:16,349 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-11-06 18:43:16,349 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:16,350 INFO L256 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:43:16,352 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:16,446 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2019-11-06 18:43:16,446 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:16,446 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 19 [2019-11-06 18:43:16,447 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678958890] [2019-11-06 18:43:16,447 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:43:16,447 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:16,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:43:16,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=253, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:43:16,448 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand 19 states. [2019-11-06 18:43:16,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:16,735 INFO L93 Difference]: Finished difference Result 112 states and 122 transitions. [2019-11-06 18:43:16,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 18:43:16,735 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 56 [2019-11-06 18:43:16,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:16,736 INFO L225 Difference]: With dead ends: 112 [2019-11-06 18:43:16,736 INFO L226 Difference]: Without dead ends: 66 [2019-11-06 18:43:16,737 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=239, Invalid=573, Unknown=0, NotChecked=0, Total=812 [2019-11-06 18:43:16,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-11-06 18:43:16,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2019-11-06 18:43:16,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-11-06 18:43:16,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2019-11-06 18:43:16,745 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 56 [2019-11-06 18:43:16,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:16,745 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2019-11-06 18:43:16,745 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:43:16,745 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2019-11-06 18:43:16,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-11-06 18:43:16,746 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:16,746 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:16,950 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:16,950 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:16,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:16,951 INFO L82 PathProgramCache]: Analyzing trace with hash 1488985628, now seen corresponding path program 7 times [2019-11-06 18:43:16,951 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:16,951 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409777015] [2019-11-06 18:43:16,951 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:16,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:17,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:17,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:17,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:17,075 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 4 proven. 100 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-06 18:43:17,075 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409777015] [2019-11-06 18:43:17,075 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1994022900] [2019-11-06 18:43:17,075 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:17,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:17,140 INFO L256 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:43:17,142 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:17,162 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-11-06 18:43:17,162 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:17,163 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 18:43:17,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896544332] [2019-11-06 18:43:17,163 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:43:17,164 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:17,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:43:17,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:43:17,164 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 15 states. [2019-11-06 18:43:17,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:17,266 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2019-11-06 18:43:17,266 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:43:17,267 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 61 [2019-11-06 18:43:17,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:17,268 INFO L225 Difference]: With dead ends: 106 [2019-11-06 18:43:17,268 INFO L226 Difference]: Without dead ends: 68 [2019-11-06 18:43:17,269 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:43:17,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-06 18:43:17,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2019-11-06 18:43:17,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-11-06 18:43:17,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2019-11-06 18:43:17,283 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 61 [2019-11-06 18:43:17,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:17,283 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2019-11-06 18:43:17,283 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:43:17,283 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2019-11-06 18:43:17,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-11-06 18:43:17,285 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:17,286 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:17,486 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:17,487 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:17,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:17,488 INFO L82 PathProgramCache]: Analyzing trace with hash -2139255110, now seen corresponding path program 8 times [2019-11-06 18:43:17,488 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:17,488 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926162652] [2019-11-06 18:43:17,488 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:17,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:17,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:17,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:17,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:17,647 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 4 proven. 121 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-06 18:43:17,647 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926162652] [2019-11-06 18:43:17,648 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1341419652] [2019-11-06 18:43:17,648 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:17,721 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:17,722 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:17,723 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 18:43:17,725 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:17,757 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2019-11-06 18:43:17,757 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:17,758 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-11-06 18:43:17,758 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779828904] [2019-11-06 18:43:17,759 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 18:43:17,759 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:17,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 18:43:17,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:43:17,761 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 16 states. [2019-11-06 18:43:17,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:17,893 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2019-11-06 18:43:17,894 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:43:17,894 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 63 [2019-11-06 18:43:17,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:17,895 INFO L225 Difference]: With dead ends: 108 [2019-11-06 18:43:17,896 INFO L226 Difference]: Without dead ends: 70 [2019-11-06 18:43:17,897 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:43:17,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-06 18:43:17,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2019-11-06 18:43:17,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2019-11-06 18:43:17,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2019-11-06 18:43:17,914 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 63 [2019-11-06 18:43:17,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:17,914 INFO L462 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2019-11-06 18:43:17,914 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 18:43:17,914 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2019-11-06 18:43:17,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-11-06 18:43:17,917 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:17,917 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:18,120 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:18,121 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:18,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:18,121 INFO L82 PathProgramCache]: Analyzing trace with hash -1365159976, now seen corresponding path program 9 times [2019-11-06 18:43:18,122 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:18,122 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300739274] [2019-11-06 18:43:18,122 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:18,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:18,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:18,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:18,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:18,388 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 4 proven. 144 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-06 18:43:18,388 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300739274] [2019-11-06 18:43:18,388 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226788486] [2019-11-06 18:43:18,389 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:18,484 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-06 18:43:18,484 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:18,486 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 18:43:18,491 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:18,807 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-06 18:43:18,810 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:43:18,810 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 11 [2019-11-06 18:43:18,811 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:43:18,818 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:43:18,819 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:43:18,820 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:29, output treesize:4 [2019-11-06 18:43:18,838 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:43:18,894 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 10 proven. 20 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2019-11-06 18:43:18,894 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:18,894 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 27 [2019-11-06 18:43:18,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84279555] [2019-11-06 18:43:18,895 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 18:43:18,895 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:18,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 18:43:18,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=563, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:43:18,896 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 27 states. [2019-11-06 18:43:19,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:19,856 INFO L93 Difference]: Finished difference Result 131 states and 142 transitions. [2019-11-06 18:43:19,856 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 18:43:19,856 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 65 [2019-11-06 18:43:19,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:19,858 INFO L225 Difference]: With dead ends: 131 [2019-11-06 18:43:19,858 INFO L226 Difference]: Without dead ends: 75 [2019-11-06 18:43:19,860 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 443 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=421, Invalid=1835, Unknown=0, NotChecked=0, Total=2256 [2019-11-06 18:43:19,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2019-11-06 18:43:19,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2019-11-06 18:43:19,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-11-06 18:43:19,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 77 transitions. [2019-11-06 18:43:19,865 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 77 transitions. Word has length 65 [2019-11-06 18:43:19,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:19,866 INFO L462 AbstractCegarLoop]: Abstraction has 74 states and 77 transitions. [2019-11-06 18:43:19,866 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 18:43:19,866 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 77 transitions. [2019-11-06 18:43:19,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2019-11-06 18:43:19,867 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:19,867 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:20,070 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:20,070 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:20,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:20,071 INFO L82 PathProgramCache]: Analyzing trace with hash 1988906486, now seen corresponding path program 10 times [2019-11-06 18:43:20,071 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:20,072 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102673384] [2019-11-06 18:43:20,072 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:20,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:20,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:20,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:20,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:20,229 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 4 proven. 169 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-11-06 18:43:20,230 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102673384] [2019-11-06 18:43:20,230 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1043312767] [2019-11-06 18:43:20,230 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:20,301 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:20,301 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:20,302 INFO L256 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:43:20,306 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:20,331 INFO L134 CoverageAnalysis]: Checked inductivity of 215 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-11-06 18:43:20,331 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:20,332 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 18:43:20,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135393614] [2019-11-06 18:43:20,333 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:43:20,333 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:20,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:43:20,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:43:20,334 INFO L87 Difference]: Start difference. First operand 74 states and 77 transitions. Second operand 18 states. [2019-11-06 18:43:20,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:20,442 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2019-11-06 18:43:20,442 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:43:20,442 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 70 [2019-11-06 18:43:20,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:20,443 INFO L225 Difference]: With dead ends: 118 [2019-11-06 18:43:20,443 INFO L226 Difference]: Without dead ends: 77 [2019-11-06 18:43:20,445 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:43:20,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-11-06 18:43:20,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2019-11-06 18:43:20,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-11-06 18:43:20,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 79 transitions. [2019-11-06 18:43:20,454 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 79 transitions. Word has length 70 [2019-11-06 18:43:20,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:20,454 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 79 transitions. [2019-11-06 18:43:20,454 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:43:20,454 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 79 transitions. [2019-11-06 18:43:20,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-11-06 18:43:20,455 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:20,455 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:20,661 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:20,661 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:20,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:20,662 INFO L82 PathProgramCache]: Analyzing trace with hash -1707036904, now seen corresponding path program 11 times [2019-11-06 18:43:20,662 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:20,662 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878443201] [2019-11-06 18:43:20,662 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:20,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:20,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:20,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:20,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:20,887 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 4 proven. 196 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-11-06 18:43:20,887 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878443201] [2019-11-06 18:43:20,888 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352191165] [2019-11-06 18:43:20,888 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:21,082 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 15 check-sat command(s) [2019-11-06 18:43:21,082 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:21,085 INFO L256 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:43:21,086 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:21,122 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2019-11-06 18:43:21,122 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:21,123 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 18:43:21,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871163350] [2019-11-06 18:43:21,123 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:43:21,124 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:21,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:43:21,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:43:21,124 INFO L87 Difference]: Start difference. First operand 76 states and 79 transitions. Second operand 19 states. [2019-11-06 18:43:21,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:21,260 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2019-11-06 18:43:21,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:43:21,261 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 72 [2019-11-06 18:43:21,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:21,263 INFO L225 Difference]: With dead ends: 120 [2019-11-06 18:43:21,263 INFO L226 Difference]: Without dead ends: 79 [2019-11-06 18:43:21,263 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:43:21,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-11-06 18:43:21,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2019-11-06 18:43:21,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2019-11-06 18:43:21,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 81 transitions. [2019-11-06 18:43:21,269 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 81 transitions. Word has length 72 [2019-11-06 18:43:21,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:21,269 INFO L462 AbstractCegarLoop]: Abstraction has 78 states and 81 transitions. [2019-11-06 18:43:21,269 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:43:21,269 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 81 transitions. [2019-11-06 18:43:21,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-11-06 18:43:21,270 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:21,271 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 5, 5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:21,476 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:21,477 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:21,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:21,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1570680902, now seen corresponding path program 12 times [2019-11-06 18:43:21,477 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:21,477 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150775328] [2019-11-06 18:43:21,478 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:21,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:21,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:21,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:21,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:21,656 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 4 proven. 225 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-11-06 18:43:21,656 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150775328] [2019-11-06 18:43:21,657 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433787838] [2019-11-06 18:43:21,657 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:21,738 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2019-11-06 18:43:21,738 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:21,740 INFO L256 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-06 18:43:21,745 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:21,918 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-11-06 18:43:21,918 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:43:21,920 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:43:21,920 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:43:21,921 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-11-06 18:43:21,935 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:43:21,992 INFO L134 CoverageAnalysis]: Checked inductivity of 271 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 232 trivial. 0 not checked. [2019-11-06 18:43:21,992 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:21,993 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 13] total 30 [2019-11-06 18:43:21,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469709677] [2019-11-06 18:43:21,993 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-06 18:43:21,994 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:21,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-06 18:43:21,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=690, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:43:21,995 INFO L87 Difference]: Start difference. First operand 78 states and 81 transitions. Second operand 30 states. [2019-11-06 18:43:22,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:22,970 INFO L93 Difference]: Finished difference Result 132 states and 139 transitions. [2019-11-06 18:43:22,970 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-06 18:43:22,970 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2019-11-06 18:43:22,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:22,971 INFO L225 Difference]: With dead ends: 132 [2019-11-06 18:43:22,971 INFO L226 Difference]: Without dead ends: 91 [2019-11-06 18:43:22,972 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=503, Invalid=1947, Unknown=0, NotChecked=0, Total=2450 [2019-11-06 18:43:22,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-11-06 18:43:22,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2019-11-06 18:43:22,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-11-06 18:43:22,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2019-11-06 18:43:22,977 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 74 [2019-11-06 18:43:22,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:22,978 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2019-11-06 18:43:22,978 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-06 18:43:22,978 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2019-11-06 18:43:22,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-11-06 18:43:22,979 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:22,979 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:23,179 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:23,180 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:23,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:23,181 INFO L82 PathProgramCache]: Analyzing trace with hash -1734170861, now seen corresponding path program 13 times [2019-11-06 18:43:23,181 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:23,181 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039355771] [2019-11-06 18:43:23,181 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:23,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:23,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:23,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:23,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:23,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:23,381 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 6 proven. 256 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-11-06 18:43:23,381 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039355771] [2019-11-06 18:43:23,381 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871603555] [2019-11-06 18:43:23,381 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:23,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:23,448 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 18:43:23,450 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:23,482 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-06 18:43:23,483 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:23,483 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-11-06 18:43:23,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197593381] [2019-11-06 18:43:23,484 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 18:43:23,484 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:23,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 18:43:23,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:43:23,485 INFO L87 Difference]: Start difference. First operand 88 states and 91 transitions. Second operand 21 states. [2019-11-06 18:43:23,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:23,599 INFO L93 Difference]: Finished difference Result 140 states and 146 transitions. [2019-11-06 18:43:23,599 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 18:43:23,600 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 84 [2019-11-06 18:43:23,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:23,600 INFO L225 Difference]: With dead ends: 140 [2019-11-06 18:43:23,601 INFO L226 Difference]: Without dead ends: 91 [2019-11-06 18:43:23,601 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:43:23,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-11-06 18:43:23,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2019-11-06 18:43:23,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2019-11-06 18:43:23,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 93 transitions. [2019-11-06 18:43:23,607 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 93 transitions. Word has length 84 [2019-11-06 18:43:23,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:23,607 INFO L462 AbstractCegarLoop]: Abstraction has 90 states and 93 transitions. [2019-11-06 18:43:23,607 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 18:43:23,607 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 93 transitions. [2019-11-06 18:43:23,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-11-06 18:43:23,608 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:23,608 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:23,808 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:23,809 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:23,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:23,810 INFO L82 PathProgramCache]: Analyzing trace with hash 1136485557, now seen corresponding path program 14 times [2019-11-06 18:43:23,810 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:23,810 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458197145] [2019-11-06 18:43:23,810 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:23,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,045 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 6 proven. 289 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-11-06 18:43:24,045 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458197145] [2019-11-06 18:43:24,045 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887897143] [2019-11-06 18:43:24,045 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:24,117 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:24,117 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:24,118 INFO L256 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 18:43:24,120 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:24,146 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-06 18:43:24,147 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:24,147 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-11-06 18:43:24,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349716054] [2019-11-06 18:43:24,148 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-06 18:43:24,151 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:24,152 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-06 18:43:24,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:43:24,152 INFO L87 Difference]: Start difference. First operand 90 states and 93 transitions. Second operand 22 states. [2019-11-06 18:43:24,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:24,304 INFO L93 Difference]: Finished difference Result 142 states and 148 transitions. [2019-11-06 18:43:24,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 18:43:24,304 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 86 [2019-11-06 18:43:24,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:24,306 INFO L225 Difference]: With dead ends: 142 [2019-11-06 18:43:24,306 INFO L226 Difference]: Without dead ends: 93 [2019-11-06 18:43:24,307 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:43:24,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2019-11-06 18:43:24,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2019-11-06 18:43:24,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-11-06 18:43:24,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 95 transitions. [2019-11-06 18:43:24,312 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 95 transitions. Word has length 86 [2019-11-06 18:43:24,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:24,313 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 95 transitions. [2019-11-06 18:43:24,313 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-06 18:43:24,313 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 95 transitions. [2019-11-06 18:43:24,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-11-06 18:43:24,314 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:24,314 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:24,517 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:24,517 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:24,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:24,518 INFO L82 PathProgramCache]: Analyzing trace with hash -1826668073, now seen corresponding path program 15 times [2019-11-06 18:43:24,518 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:24,518 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122803375] [2019-11-06 18:43:24,518 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:24,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:24,772 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 6 proven. 324 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-11-06 18:43:24,773 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122803375] [2019-11-06 18:43:24,773 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [54663923] [2019-11-06 18:43:24,773 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:24,856 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-11-06 18:43:24,857 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:24,857 INFO L256 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-06 18:43:24,872 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:25,189 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-06 18:43:25,190 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:43:25,191 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 11 [2019-11-06 18:43:25,192 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:43:25,197 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:43:25,198 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:43:25,198 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:29, output treesize:4 [2019-11-06 18:43:25,215 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:43:25,268 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 21 proven. 33 refuted. 0 times theorem prover too weak. 336 trivial. 0 not checked. [2019-11-06 18:43:25,268 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:25,268 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 15] total 35 [2019-11-06 18:43:25,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688241232] [2019-11-06 18:43:25,269 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-06 18:43:25,269 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:25,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-06 18:43:25,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=935, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 18:43:25,270 INFO L87 Difference]: Start difference. First operand 92 states and 95 transitions. Second operand 35 states. [2019-11-06 18:43:28,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:28,849 INFO L93 Difference]: Finished difference Result 169 states and 181 transitions. [2019-11-06 18:43:28,851 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-11-06 18:43:28,852 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 88 [2019-11-06 18:43:28,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:28,853 INFO L225 Difference]: With dead ends: 169 [2019-11-06 18:43:28,853 INFO L226 Difference]: Without dead ends: 98 [2019-11-06 18:43:28,856 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 813 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=800, Invalid=3232, Unknown=0, NotChecked=0, Total=4032 [2019-11-06 18:43:28,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-11-06 18:43:28,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2019-11-06 18:43:28,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-11-06 18:43:28,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2019-11-06 18:43:28,862 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 88 [2019-11-06 18:43:28,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:28,862 INFO L462 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2019-11-06 18:43:28,862 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-06 18:43:28,863 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2019-11-06 18:43:28,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-11-06 18:43:28,863 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:28,864 INFO L410 BasicCegarLoop]: trace histogram [19, 19, 6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:29,067 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:29,068 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:29,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:29,068 INFO L82 PathProgramCache]: Analyzing trace with hash -553957407, now seen corresponding path program 16 times [2019-11-06 18:43:29,068 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:29,068 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1317849396] [2019-11-06 18:43:29,068 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:29,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:29,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:29,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:29,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:29,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:29,390 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 6 proven. 361 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-11-06 18:43:29,391 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1317849396] [2019-11-06 18:43:29,391 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045023448] [2019-11-06 18:43:29,391 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:29,477 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:29,477 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:29,478 INFO L256 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 18:43:29,480 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:29,497 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 18:43:29,497 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:29,498 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-11-06 18:43:29,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962209825] [2019-11-06 18:43:29,498 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-06 18:43:29,498 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:29,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-06 18:43:29,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:43:29,499 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 24 states. [2019-11-06 18:43:29,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:29,687 INFO L93 Difference]: Finished difference Result 152 states and 158 transitions. [2019-11-06 18:43:29,687 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 18:43:29,687 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 93 [2019-11-06 18:43:29,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:29,688 INFO L225 Difference]: With dead ends: 152 [2019-11-06 18:43:29,689 INFO L226 Difference]: Without dead ends: 100 [2019-11-06 18:43:29,689 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:43:29,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-11-06 18:43:29,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2019-11-06 18:43:29,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2019-11-06 18:43:29,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2019-11-06 18:43:29,695 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 93 [2019-11-06 18:43:29,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:29,695 INFO L462 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2019-11-06 18:43:29,695 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-06 18:43:29,695 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2019-11-06 18:43:29,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2019-11-06 18:43:29,696 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:29,696 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:29,899 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:29,900 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:29,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:29,900 INFO L82 PathProgramCache]: Analyzing trace with hash -534855553, now seen corresponding path program 17 times [2019-11-06 18:43:29,901 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:29,901 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [826743967] [2019-11-06 18:43:29,901 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:29,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:30,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:30,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:30,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:30,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:30,205 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 6 proven. 400 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-11-06 18:43:30,205 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [826743967] [2019-11-06 18:43:30,205 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941839474] [2019-11-06 18:43:30,205 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:30,548 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2019-11-06 18:43:30,548 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:30,551 INFO L256 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-06 18:43:30,553 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:30,573 INFO L134 CoverageAnalysis]: Checked inductivity of 481 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 18:43:30,573 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:30,573 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-11-06 18:43:30,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665023875] [2019-11-06 18:43:30,574 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 18:43:30,574 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:30,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 18:43:30,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:43:30,575 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 25 states. [2019-11-06 18:43:30,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:30,682 INFO L93 Difference]: Finished difference Result 154 states and 160 transitions. [2019-11-06 18:43:30,683 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-06 18:43:30,683 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 95 [2019-11-06 18:43:30,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:30,684 INFO L225 Difference]: With dead ends: 154 [2019-11-06 18:43:30,684 INFO L226 Difference]: Without dead ends: 102 [2019-11-06 18:43:30,685 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:43:30,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2019-11-06 18:43:30,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2019-11-06 18:43:30,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2019-11-06 18:43:30,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2019-11-06 18:43:30,691 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 95 [2019-11-06 18:43:30,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:30,692 INFO L462 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2019-11-06 18:43:30,692 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 18:43:30,692 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2019-11-06 18:43:30,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2019-11-06 18:43:30,693 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:30,693 INFO L410 BasicCegarLoop]: trace histogram [21, 21, 6, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:30,898 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:30,898 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:30,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:30,899 INFO L82 PathProgramCache]: Analyzing trace with hash 642156957, now seen corresponding path program 18 times [2019-11-06 18:43:30,899 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:30,899 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058173454] [2019-11-06 18:43:30,900 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:30,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:31,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:31,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:31,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:31,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:31,168 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 6 proven. 441 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2019-11-06 18:43:31,169 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058173454] [2019-11-06 18:43:31,169 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2134895926] [2019-11-06 18:43:31,169 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:31,378 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2019-11-06 18:43:31,378 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:31,381 INFO L256 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-06 18:43:31,384 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:31,734 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-11-06 18:43:31,735 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:43:31,737 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:43:31,737 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:43:31,737 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-11-06 18:43:31,780 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:43:31,853 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 6 proven. 60 refuted. 0 times theorem prover too weak. 456 trivial. 0 not checked. [2019-11-06 18:43:31,854 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:31,854 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 15] total 38 [2019-11-06 18:43:31,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065781566] [2019-11-06 18:43:31,855 INFO L442 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-11-06 18:43:31,855 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:31,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-11-06 18:43:31,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=1098, Unknown=0, NotChecked=0, Total=1406 [2019-11-06 18:43:31,856 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 38 states. [2019-11-06 18:43:33,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:33,271 INFO L93 Difference]: Finished difference Result 166 states and 173 transitions. [2019-11-06 18:43:33,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-11-06 18:43:33,272 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 97 [2019-11-06 18:43:33,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:33,273 INFO L225 Difference]: With dead ends: 166 [2019-11-06 18:43:33,273 INFO L226 Difference]: Without dead ends: 114 [2019-11-06 18:43:33,275 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 730 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=877, Invalid=3155, Unknown=0, NotChecked=0, Total=4032 [2019-11-06 18:43:33,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-11-06 18:43:33,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 111. [2019-11-06 18:43:33,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-11-06 18:43:33,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 114 transitions. [2019-11-06 18:43:33,282 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 114 transitions. Word has length 97 [2019-11-06 18:43:33,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:33,282 INFO L462 AbstractCegarLoop]: Abstraction has 111 states and 114 transitions. [2019-11-06 18:43:33,282 INFO L463 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-11-06 18:43:33,282 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 114 transitions. [2019-11-06 18:43:33,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2019-11-06 18:43:33,283 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:33,283 INFO L410 BasicCegarLoop]: trace histogram [22, 22, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:33,487 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:33,488 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:33,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:33,488 INFO L82 PathProgramCache]: Analyzing trace with hash -1729557646, now seen corresponding path program 19 times [2019-11-06 18:43:33,489 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:33,489 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1116867283] [2019-11-06 18:43:33,490 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:33,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:33,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:33,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:33,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:33,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:33,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:33,836 INFO L134 CoverageAnalysis]: Checked inductivity of 593 backedges. 8 proven. 484 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2019-11-06 18:43:33,837 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1116867283] [2019-11-06 18:43:33,837 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1502153330] [2019-11-06 18:43:33,837 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:33,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:33,930 INFO L256 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 18:43:33,932 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:33,965 INFO L134 CoverageAnalysis]: Checked inductivity of 593 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2019-11-06 18:43:33,966 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:33,966 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-11-06 18:43:33,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66784084] [2019-11-06 18:43:33,966 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 18:43:33,966 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:33,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 18:43:33,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:43:33,967 INFO L87 Difference]: Start difference. First operand 111 states and 114 transitions. Second operand 27 states. [2019-11-06 18:43:34,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:34,165 INFO L93 Difference]: Finished difference Result 174 states and 180 transitions. [2019-11-06 18:43:34,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-06 18:43:34,165 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 107 [2019-11-06 18:43:34,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:34,167 INFO L225 Difference]: With dead ends: 174 [2019-11-06 18:43:34,167 INFO L226 Difference]: Without dead ends: 114 [2019-11-06 18:43:34,168 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:43:34,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-11-06 18:43:34,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2019-11-06 18:43:34,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2019-11-06 18:43:34,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 116 transitions. [2019-11-06 18:43:34,174 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 116 transitions. Word has length 107 [2019-11-06 18:43:34,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:34,174 INFO L462 AbstractCegarLoop]: Abstraction has 113 states and 116 transitions. [2019-11-06 18:43:34,174 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 18:43:34,174 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 116 transitions. [2019-11-06 18:43:34,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2019-11-06 18:43:34,175 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:34,175 INFO L410 BasicCegarLoop]: trace histogram [23, 23, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:34,378 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:34,378 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:34,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:34,379 INFO L82 PathProgramCache]: Analyzing trace with hash -1341778032, now seen corresponding path program 20 times [2019-11-06 18:43:34,379 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:34,380 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143153666] [2019-11-06 18:43:34,380 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:34,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:34,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:34,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:34,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:34,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:34,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:34,694 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 8 proven. 529 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2019-11-06 18:43:34,694 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [143153666] [2019-11-06 18:43:34,694 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [485421331] [2019-11-06 18:43:34,694 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:34,788 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:34,789 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:34,790 INFO L256 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 25 conjunts are in the unsatisfiable core [2019-11-06 18:43:34,791 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:34,812 INFO L134 CoverageAnalysis]: Checked inductivity of 638 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2019-11-06 18:43:34,812 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:34,812 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2019-11-06 18:43:34,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871978548] [2019-11-06 18:43:34,813 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-06 18:43:34,813 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:34,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-06 18:43:34,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-11-06 18:43:34,814 INFO L87 Difference]: Start difference. First operand 113 states and 116 transitions. Second operand 28 states. [2019-11-06 18:43:35,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:35,006 INFO L93 Difference]: Finished difference Result 176 states and 182 transitions. [2019-11-06 18:43:35,006 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-06 18:43:35,006 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 109 [2019-11-06 18:43:35,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:35,007 INFO L225 Difference]: With dead ends: 176 [2019-11-06 18:43:35,008 INFO L226 Difference]: Without dead ends: 116 [2019-11-06 18:43:35,008 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2019-11-06 18:43:35,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-11-06 18:43:35,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2019-11-06 18:43:35,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2019-11-06 18:43:35,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 118 transitions. [2019-11-06 18:43:35,014 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 118 transitions. Word has length 109 [2019-11-06 18:43:35,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:35,015 INFO L462 AbstractCegarLoop]: Abstraction has 115 states and 118 transitions. [2019-11-06 18:43:35,015 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-06 18:43:35,015 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 118 transitions. [2019-11-06 18:43:35,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-11-06 18:43:35,015 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:35,016 INFO L410 BasicCegarLoop]: trace histogram [24, 24, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:35,219 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:35,219 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:35,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:35,220 INFO L82 PathProgramCache]: Analyzing trace with hash 1947243566, now seen corresponding path program 21 times [2019-11-06 18:43:35,220 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:35,221 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936742093] [2019-11-06 18:43:35,221 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:35,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:35,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:35,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:35,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:35,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:35,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:35,762 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 8 proven. 576 refuted. 0 times theorem prover too weak. 101 trivial. 0 not checked. [2019-11-06 18:43:35,762 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936742093] [2019-11-06 18:43:35,762 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [575763818] [2019-11-06 18:43:35,763 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:35,896 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 18:43:35,896 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:35,898 INFO L256 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-06 18:43:35,902 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:36,499 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-06 18:43:36,501 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:43:36,501 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 11 [2019-11-06 18:43:36,502 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:43:36,509 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:43:36,510 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:43:36,510 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:29, output treesize:4 [2019-11-06 18:43:36,542 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:43:36,718 INFO L134 CoverageAnalysis]: Checked inductivity of 685 backedges. 36 proven. 49 refuted. 0 times theorem prover too weak. 600 trivial. 0 not checked. [2019-11-06 18:43:36,719 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:36,719 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 17] total 43 [2019-11-06 18:43:36,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584889080] [2019-11-06 18:43:36,720 INFO L442 AbstractCegarLoop]: Interpolant automaton has 43 states [2019-11-06 18:43:36,720 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:36,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2019-11-06 18:43:36,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=409, Invalid=1397, Unknown=0, NotChecked=0, Total=1806 [2019-11-06 18:43:36,721 INFO L87 Difference]: Start difference. First operand 115 states and 118 transitions. Second operand 43 states. [2019-11-06 18:43:39,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:39,292 INFO L93 Difference]: Finished difference Result 207 states and 220 transitions. [2019-11-06 18:43:39,292 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-11-06 18:43:39,292 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 111 [2019-11-06 18:43:39,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:39,293 INFO L225 Difference]: With dead ends: 207 [2019-11-06 18:43:39,294 INFO L226 Difference]: Without dead ends: 121 [2019-11-06 18:43:39,296 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1290 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1306, Invalid=5014, Unknown=0, NotChecked=0, Total=6320 [2019-11-06 18:43:39,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2019-11-06 18:43:39,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2019-11-06 18:43:39,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2019-11-06 18:43:39,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2019-11-06 18:43:39,307 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 111 [2019-11-06 18:43:39,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:39,307 INFO L462 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2019-11-06 18:43:39,308 INFO L463 AbstractCegarLoop]: Interpolant automaton has 43 states. [2019-11-06 18:43:39,308 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2019-11-06 18:43:39,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2019-11-06 18:43:39,308 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:39,309 INFO L410 BasicCegarLoop]: trace histogram [25, 25, 7, 7, 6, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:39,512 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:39,512 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:39,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:39,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1920998396, now seen corresponding path program 22 times [2019-11-06 18:43:39,513 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:39,513 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724848002] [2019-11-06 18:43:39,513 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:39,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:40,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:40,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:40,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:40,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:40,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:40,041 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 8 proven. 625 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2019-11-06 18:43:40,042 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724848002] [2019-11-06 18:43:40,042 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1207213310] [2019-11-06 18:43:40,042 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:40,175 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:40,175 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:40,176 INFO L256 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 27 conjunts are in the unsatisfiable core [2019-11-06 18:43:40,179 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:40,205 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 127 trivial. 0 not checked. [2019-11-06 18:43:40,206 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:40,206 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-11-06 18:43:40,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878701338] [2019-11-06 18:43:40,207 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-06 18:43:40,207 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:40,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-06 18:43:40,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:43:40,208 INFO L87 Difference]: Start difference. First operand 120 states and 123 transitions. Second operand 30 states. [2019-11-06 18:43:40,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:40,420 INFO L93 Difference]: Finished difference Result 186 states and 192 transitions. [2019-11-06 18:43:40,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 18:43:40,421 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 116 [2019-11-06 18:43:40,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:40,422 INFO L225 Difference]: With dead ends: 186 [2019-11-06 18:43:40,422 INFO L226 Difference]: Without dead ends: 123 [2019-11-06 18:43:40,422 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:43:40,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2019-11-06 18:43:40,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2019-11-06 18:43:40,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2019-11-06 18:43:40,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 125 transitions. [2019-11-06 18:43:40,428 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 125 transitions. Word has length 116 [2019-11-06 18:43:40,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:40,428 INFO L462 AbstractCegarLoop]: Abstraction has 122 states and 125 transitions. [2019-11-06 18:43:40,428 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-06 18:43:40,429 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 125 transitions. [2019-11-06 18:43:40,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2019-11-06 18:43:40,429 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:40,429 INFO L410 BasicCegarLoop]: trace histogram [26, 26, 7, 7, 6, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:40,633 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:40,633 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:40,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:40,634 INFO L82 PathProgramCache]: Analyzing trace with hash 501993886, now seen corresponding path program 23 times [2019-11-06 18:43:40,634 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:40,635 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1352659679] [2019-11-06 18:43:40,635 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:40,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:41,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:41,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:41,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:41,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:41,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:41,195 INFO L134 CoverageAnalysis]: Checked inductivity of 803 backedges. 8 proven. 676 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2019-11-06 18:43:41,196 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1352659679] [2019-11-06 18:43:41,196 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833763436] [2019-11-06 18:43:41,196 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:41,751 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 27 check-sat command(s) [2019-11-06 18:43:41,751 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:41,755 INFO L256 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 28 conjunts are in the unsatisfiable core [2019-11-06 18:43:41,757 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:41,781 INFO L134 CoverageAnalysis]: Checked inductivity of 803 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 127 trivial. 0 not checked. [2019-11-06 18:43:41,781 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:41,781 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-11-06 18:43:41,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054807611] [2019-11-06 18:43:41,782 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 18:43:41,782 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:41,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 18:43:41,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:43:41,783 INFO L87 Difference]: Start difference. First operand 122 states and 125 transitions. Second operand 31 states. [2019-11-06 18:43:41,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:41,994 INFO L93 Difference]: Finished difference Result 188 states and 194 transitions. [2019-11-06 18:43:41,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-06 18:43:41,994 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 118 [2019-11-06 18:43:41,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:41,995 INFO L225 Difference]: With dead ends: 188 [2019-11-06 18:43:41,995 INFO L226 Difference]: Without dead ends: 125 [2019-11-06 18:43:41,996 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:43:41,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2019-11-06 18:43:42,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2019-11-06 18:43:42,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-11-06 18:43:42,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 127 transitions. [2019-11-06 18:43:42,004 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 127 transitions. Word has length 118 [2019-11-06 18:43:42,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:42,004 INFO L462 AbstractCegarLoop]: Abstraction has 124 states and 127 transitions. [2019-11-06 18:43:42,004 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 18:43:42,004 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 127 transitions. [2019-11-06 18:43:42,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2019-11-06 18:43:42,005 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:42,005 INFO L410 BasicCegarLoop]: trace histogram [27, 27, 7, 7, 6, 5, 5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:42,210 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:42,211 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:42,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:42,211 INFO L82 PathProgramCache]: Analyzing trace with hash -1656707392, now seen corresponding path program 24 times [2019-11-06 18:43:42,214 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:42,214 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157738979] [2019-11-06 18:43:42,214 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:42,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:42,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:42,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:42,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:42,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:42,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:42,675 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 8 proven. 729 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2019-11-06 18:43:42,677 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157738979] [2019-11-06 18:43:42,677 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804740942] [2019-11-06 18:43:42,677 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:42,884 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-06 18:43:42,884 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:42,886 INFO L256 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 36 conjunts are in the unsatisfiable core [2019-11-06 18:43:42,888 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:43,685 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-11-06 18:43:43,685 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:43:43,687 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:43:43,688 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:43:43,688 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-11-06 18:43:43,727 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:43:43,837 INFO L134 CoverageAnalysis]: Checked inductivity of 856 backedges. 8 proven. 92 refuted. 0 times theorem prover too weak. 756 trivial. 0 not checked. [2019-11-06 18:43:43,837 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:43,838 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 17] total 46 [2019-11-06 18:43:43,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1096570800] [2019-11-06 18:43:43,839 INFO L442 AbstractCegarLoop]: Interpolant automaton has 46 states [2019-11-06 18:43:43,839 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:43,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2019-11-06 18:43:43,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=472, Invalid=1598, Unknown=0, NotChecked=0, Total=2070 [2019-11-06 18:43:43,841 INFO L87 Difference]: Start difference. First operand 124 states and 127 transitions. Second operand 46 states. [2019-11-06 18:43:45,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:45,768 INFO L93 Difference]: Finished difference Result 200 states and 207 transitions. [2019-11-06 18:43:45,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-11-06 18:43:45,768 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 120 [2019-11-06 18:43:45,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:45,770 INFO L225 Difference]: With dead ends: 200 [2019-11-06 18:43:45,770 INFO L226 Difference]: Without dead ends: 137 [2019-11-06 18:43:45,771 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1097 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1359, Invalid=4647, Unknown=0, NotChecked=0, Total=6006 [2019-11-06 18:43:45,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2019-11-06 18:43:45,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 134. [2019-11-06 18:43:45,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2019-11-06 18:43:45,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 137 transitions. [2019-11-06 18:43:45,777 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 137 transitions. Word has length 120 [2019-11-06 18:43:45,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:45,777 INFO L462 AbstractCegarLoop]: Abstraction has 134 states and 137 transitions. [2019-11-06 18:43:45,778 INFO L463 AbstractCegarLoop]: Interpolant automaton has 46 states. [2019-11-06 18:43:45,778 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 137 transitions. [2019-11-06 18:43:45,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2019-11-06 18:43:45,779 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:45,779 INFO L410 BasicCegarLoop]: trace histogram [28, 28, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:45,982 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:45,983 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:45,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:45,983 INFO L82 PathProgramCache]: Analyzing trace with hash -323867495, now seen corresponding path program 25 times [2019-11-06 18:43:45,983 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:45,984 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751566078] [2019-11-06 18:43:45,984 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:46,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:46,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:46,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:46,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:46,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:46,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:46,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:46,418 INFO L134 CoverageAnalysis]: Checked inductivity of 947 backedges. 10 proven. 784 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-11-06 18:43:46,418 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751566078] [2019-11-06 18:43:46,418 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1183011957] [2019-11-06 18:43:46,418 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:46,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:46,524 INFO L256 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-06 18:43:46,527 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:46,555 INFO L134 CoverageAnalysis]: Checked inductivity of 947 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2019-11-06 18:43:46,556 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:46,556 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2019-11-06 18:43:46,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729071068] [2019-11-06 18:43:46,556 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-11-06 18:43:46,557 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:46,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-11-06 18:43:46,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 18:43:46,558 INFO L87 Difference]: Start difference. First operand 134 states and 137 transitions. Second operand 33 states. [2019-11-06 18:43:46,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:46,716 INFO L93 Difference]: Finished difference Result 208 states and 214 transitions. [2019-11-06 18:43:46,716 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-06 18:43:46,716 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 130 [2019-11-06 18:43:46,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:46,717 INFO L225 Difference]: With dead ends: 208 [2019-11-06 18:43:46,717 INFO L226 Difference]: Without dead ends: 137 [2019-11-06 18:43:46,718 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 18:43:46,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2019-11-06 18:43:46,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2019-11-06 18:43:46,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2019-11-06 18:43:46,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 139 transitions. [2019-11-06 18:43:46,725 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 139 transitions. Word has length 130 [2019-11-06 18:43:46,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:46,726 INFO L462 AbstractCegarLoop]: Abstraction has 136 states and 139 transitions. [2019-11-06 18:43:46,726 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-11-06 18:43:46,726 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 139 transitions. [2019-11-06 18:43:46,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2019-11-06 18:43:46,727 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:46,727 INFO L410 BasicCegarLoop]: trace histogram [29, 29, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:46,930 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:46,931 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:46,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:46,931 INFO L82 PathProgramCache]: Analyzing trace with hash -1076470085, now seen corresponding path program 26 times [2019-11-06 18:43:46,931 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:46,932 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981373099] [2019-11-06 18:43:46,932 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:46,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:47,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:47,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:47,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:47,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:47,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:47,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:47,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1004 backedges. 10 proven. 841 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-11-06 18:43:47,371 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981373099] [2019-11-06 18:43:47,371 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [943812939] [2019-11-06 18:43:47,371 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:47,477 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:47,477 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:47,479 INFO L256 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 31 conjunts are in the unsatisfiable core [2019-11-06 18:43:47,481 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:47,502 INFO L134 CoverageAnalysis]: Checked inductivity of 1004 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2019-11-06 18:43:47,503 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:47,503 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2019-11-06 18:43:47,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564426477] [2019-11-06 18:43:47,503 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-11-06 18:43:47,504 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:47,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-11-06 18:43:47,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 18:43:47,504 INFO L87 Difference]: Start difference. First operand 136 states and 139 transitions. Second operand 34 states. [2019-11-06 18:43:47,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:47,700 INFO L93 Difference]: Finished difference Result 210 states and 216 transitions. [2019-11-06 18:43:47,700 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-11-06 18:43:47,701 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 132 [2019-11-06 18:43:47,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:47,702 INFO L225 Difference]: With dead ends: 210 [2019-11-06 18:43:47,702 INFO L226 Difference]: Without dead ends: 139 [2019-11-06 18:43:47,704 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 18:43:47,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2019-11-06 18:43:47,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 138. [2019-11-06 18:43:47,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2019-11-06 18:43:47,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 141 transitions. [2019-11-06 18:43:47,709 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 141 transitions. Word has length 132 [2019-11-06 18:43:47,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:47,710 INFO L462 AbstractCegarLoop]: Abstraction has 138 states and 141 transitions. [2019-11-06 18:43:47,710 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-11-06 18:43:47,710 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 141 transitions. [2019-11-06 18:43:47,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2019-11-06 18:43:47,711 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:47,711 INFO L410 BasicCegarLoop]: trace histogram [30, 30, 7, 7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:47,914 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:47,914 INFO L410 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:47,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:47,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1521913949, now seen corresponding path program 27 times [2019-11-06 18:43:47,915 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:47,915 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986301815] [2019-11-06 18:43:47,915 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:47,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:48,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:48,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:48,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:48,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:48,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:48,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:48,605 INFO L134 CoverageAnalysis]: Checked inductivity of 1063 backedges. 10 proven. 900 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-11-06 18:43:48,606 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986301815] [2019-11-06 18:43:48,606 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193483914] [2019-11-06 18:43:48,606 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:48,721 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2019-11-06 18:43:48,721 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:48,723 INFO L256 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 38 conjunts are in the unsatisfiable core [2019-11-06 18:43:48,726 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:49,148 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 8 [2019-11-06 18:43:49,148 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:43:49,149 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:43:49,150 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:43:49,150 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:20, output treesize:4