/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-crafted/zero_sum_const1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:37:48,765 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:37:48,768 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:37:48,780 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:37:48,781 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:37:48,783 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:37:48,786 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:37:48,788 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:37:48,791 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:37:48,791 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:37:48,799 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:37:48,800 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:37:48,802 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:37:48,803 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:37:48,806 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:37:48,808 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:37:48,810 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:37:48,811 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:37:48,815 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:37:48,818 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:37:48,820 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:37:48,821 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:37:48,824 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:37:48,825 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:37:48,829 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:37:48,843 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:37:48,845 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:37:48,846 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:37:48,847 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 18:37:48,886 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:37:48,886 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:37:48,887 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:37:48,888 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:37:48,888 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:37:48,888 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:37:48,888 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:37:48,888 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:37:48,889 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:37:48,889 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:37:48,889 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:37:48,889 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:37:48,889 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:37:48,890 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:37:48,890 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:37:48,890 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:37:48,890 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:37:48,890 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:37:48,891 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:37:48,893 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:37:48,893 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:37:48,893 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:37:48,894 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:37:48,894 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:37:48,895 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:37:48,895 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:37:48,895 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:37:48,895 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:37:48,895 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:37:49,184 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:37:49,198 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:37:49,202 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:37:49,204 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:37:49,204 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:37:49,205 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_const1.c [2019-11-06 18:37:49,282 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cbdc2fd8c/a4d56bd02be84ce1b5985984ba153948/FLAG57ae9ccb6 [2019-11-06 18:37:49,737 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:37:49,738 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_const1.c [2019-11-06 18:37:49,744 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cbdc2fd8c/a4d56bd02be84ce1b5985984ba153948/FLAG57ae9ccb6 [2019-11-06 18:37:50,090 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cbdc2fd8c/a4d56bd02be84ce1b5985984ba153948 [2019-11-06 18:37:50,100 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:37:50,103 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:37:50,107 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:37:50,108 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:37:50,111 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:37:50,112 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:37:50" (1/1) ... [2019-11-06 18:37:50,115 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f437f01 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:37:50, skipping insertion in model container [2019-11-06 18:37:50,115 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:37:50" (1/1) ... [2019-11-06 18:37:50,124 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:37:50,146 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:37:50,327 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:37:50,339 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:37:50,367 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:37:50,380 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:37:50,380 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:37:50 WrapperNode [2019-11-06 18:37:50,380 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:37:50,381 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:37:50,381 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:37:50,381 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:37:50,395 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:37:50" (1/1) ... [2019-11-06 18:37:50,395 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:37:50" (1/1) ... [2019-11-06 18:37:50,496 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:37:50" (1/1) ... [2019-11-06 18:37:50,497 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:37:50" (1/1) ... [2019-11-06 18:37:50,513 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:37:50" (1/1) ... [2019-11-06 18:37:50,520 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:37:50" (1/1) ... [2019-11-06 18:37:50,528 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:37:50" (1/1) ... [2019-11-06 18:37:50,531 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:37:50,531 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:37:50,532 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:37:50,532 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:37:50,533 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:37:50" (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 18:37:50,599 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:37:50,599 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:37:50,599 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:37:50,599 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:37:50,600 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:37:50,600 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-06 18:37:50,600 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:37:50,600 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_long [2019-11-06 18:37:50,600 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-11-06 18:37:50,600 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:37:50,601 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-06 18:37:50,601 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:37:50,601 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:37:50,602 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:37:50,602 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:37:50,603 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:37:50,895 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:37:50,896 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-06 18:37:50,897 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:37:50 BoogieIcfgContainer [2019-11-06 18:37:50,897 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:37:50,898 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:37:50,898 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:37:50,901 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:37:50,901 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:37:50" (1/3) ... [2019-11-06 18:37:50,902 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3af4f447 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:37:50, skipping insertion in model container [2019-11-06 18:37:50,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:37:50" (2/3) ... [2019-11-06 18:37:50,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3af4f447 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:37:50, skipping insertion in model container [2019-11-06 18:37:50,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:37:50" (3/3) ... [2019-11-06 18:37:50,905 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_const1.c [2019-11-06 18:37:50,914 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:37:50,923 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:37:50,935 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:37:50,958 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:37:50,959 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:37:50,959 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:37:50,959 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:37:50,959 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:37:50,959 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:37:50,959 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:37:50,959 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:37:50,974 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-11-06 18:37:50,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 18:37:50,982 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:37:50,984 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:37:50,985 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:37:50,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:37:50,991 INFO L82 PathProgramCache]: Analyzing trace with hash -39751432, now seen corresponding path program 1 times [2019-11-06 18:37:50,999 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:37:50,999 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [217223725] [2019-11-06 18:37:51,000 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:37:51,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:51,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:51,194 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 18:37:51,195 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [217223725] [2019-11-06 18:37:51,196 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:37:51,197 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:37:51,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924573298] [2019-11-06 18:37:51,202 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:37:51,203 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:37:51,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:37:51,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:37:51,221 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-11-06 18:37:51,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:37:51,321 INFO L93 Difference]: Finished difference Result 45 states and 57 transitions. [2019-11-06 18:37:51,322 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:37:51,324 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-11-06 18:37:51,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:37:51,330 INFO L225 Difference]: With dead ends: 45 [2019-11-06 18:37:51,331 INFO L226 Difference]: Without dead ends: 20 [2019-11-06 18:37:51,334 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 18:37:51,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-06 18:37:51,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-06 18:37:51,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-06 18:37:51,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-11-06 18:37:51,375 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 16 [2019-11-06 18:37:51,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:37:51,375 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-11-06 18:37:51,376 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:37:51,376 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-11-06 18:37:51,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-06 18:37:51,377 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:37:51,377 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:37:51,378 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:37:51,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:37:51,378 INFO L82 PathProgramCache]: Analyzing trace with hash 1179444838, now seen corresponding path program 1 times [2019-11-06 18:37:51,379 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:37:51,379 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511611812] [2019-11-06 18:37:51,379 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:37:51,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:51,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:51,510 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 18:37:51,511 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511611812] [2019-11-06 18:37:51,511 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:37:51,511 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 18:37:51,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302610277] [2019-11-06 18:37:51,513 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:37:51,514 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:37:51,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:37:51,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:37:51,515 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2019-11-06 18:37:51,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:37:51,678 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2019-11-06 18:37:51,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:37:51,678 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2019-11-06 18:37:51,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:37:51,679 INFO L225 Difference]: With dead ends: 28 [2019-11-06 18:37:51,680 INFO L226 Difference]: Without dead ends: 23 [2019-11-06 18:37:51,682 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:37:51,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-06 18:37:51,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-11-06 18:37:51,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-06 18:37:51,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2019-11-06 18:37:51,695 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 16 [2019-11-06 18:37:51,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:37:51,695 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2019-11-06 18:37:51,696 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:37:51,697 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2019-11-06 18:37:51,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-06 18:37:51,698 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:37:51,698 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 18:37:51,699 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:37:51,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:37:51,700 INFO L82 PathProgramCache]: Analyzing trace with hash 621827044, now seen corresponding path program 1 times [2019-11-06 18:37:51,700 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:37:51,701 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255497721] [2019-11-06 18:37:51,702 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:37:51,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:51,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:51,793 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 18:37:51,793 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255497721] [2019-11-06 18:37:51,794 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:37:51,794 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:37:51,794 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092441395] [2019-11-06 18:37:51,794 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:37:51,795 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:37:51,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:37:51,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:37:51,796 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand 4 states. [2019-11-06 18:37:51,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:37:51,861 INFO L93 Difference]: Finished difference Result 39 states and 45 transitions. [2019-11-06 18:37:51,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:37:51,863 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-11-06 18:37:51,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:37:51,863 INFO L225 Difference]: With dead ends: 39 [2019-11-06 18:37:51,864 INFO L226 Difference]: Without dead ends: 25 [2019-11-06 18:37:51,864 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 18:37:51,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-06 18:37:51,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2019-11-06 18:37:51,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-06 18:37:51,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2019-11-06 18:37:51,872 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 18 [2019-11-06 18:37:51,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:37:51,872 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2019-11-06 18:37:51,872 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:37:51,872 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2019-11-06 18:37:51,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 18:37:51,873 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:37:51,874 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:37:51,874 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:37:51,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:37:51,874 INFO L82 PathProgramCache]: Analyzing trace with hash 1263872610, now seen corresponding path program 1 times [2019-11-06 18:37:51,875 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:37:51,875 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [85417438] [2019-11-06 18:37:51,875 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:37:51,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:51,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:51,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:37:51,975 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [85417438] [2019-11-06 18:37:51,976 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:37:51,976 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-06 18:37:51,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109817603] [2019-11-06 18:37:51,977 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 18:37:51,977 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:37:51,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 18:37:51,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-06 18:37:51,978 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 5 states. [2019-11-06 18:37:52,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:37:52,081 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2019-11-06 18:37:52,082 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:37:52,082 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2019-11-06 18:37:52,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:37:52,083 INFO L225 Difference]: With dead ends: 35 [2019-11-06 18:37:52,083 INFO L226 Difference]: Without dead ends: 26 [2019-11-06 18:37:52,084 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:37:52,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-06 18:37:52,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 23. [2019-11-06 18:37:52,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-06 18:37:52,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-11-06 18:37:52,090 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 20 [2019-11-06 18:37:52,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:37:52,090 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-11-06 18:37:52,090 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 18:37:52,090 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-11-06 18:37:52,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-06 18:37:52,091 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:37:52,092 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:37:52,092 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:37:52,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:37:52,092 INFO L82 PathProgramCache]: Analyzing trace with hash 245922080, now seen corresponding path program 1 times [2019-11-06 18:37:52,093 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:37:52,093 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248353570] [2019-11-06 18:37:52,093 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:37:52,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:52,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:52,172 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:37:52,173 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248353570] [2019-11-06 18:37:52,173 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697173249] [2019-11-06 18:37:52,173 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 18:37:52,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:52,228 INFO L256 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:37:52,235 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:37:52,290 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:37:52,291 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:37:52,291 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2019-11-06 18:37:52,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571125026] [2019-11-06 18:37:52,292 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:37:52,293 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:37:52,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:37:52,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:37:52,293 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 7 states. [2019-11-06 18:37:52,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:37:52,375 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2019-11-06 18:37:52,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:37:52,376 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2019-11-06 18:37:52,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:37:52,377 INFO L225 Difference]: With dead ends: 39 [2019-11-06 18:37:52,377 INFO L226 Difference]: Without dead ends: 26 [2019-11-06 18:37:52,377 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:37:52,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-06 18:37:52,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2019-11-06 18:37:52,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-06 18:37:52,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2019-11-06 18:37:52,383 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 22 [2019-11-06 18:37:52,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:37:52,384 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2019-11-06 18:37:52,384 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:37:52,384 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2019-11-06 18:37:52,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-06 18:37:52,385 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:37:52,385 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:37:52,590 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:37:52,591 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:37:52,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:37:52,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1099030686, now seen corresponding path program 2 times [2019-11-06 18:37:52,592 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:37:52,592 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399530258] [2019-11-06 18:37:52,593 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:37:52,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:52,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:52,696 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-06 18:37:52,696 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399530258] [2019-11-06 18:37:52,696 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [385905695] [2019-11-06 18:37:52,697 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 18:37:52,740 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:37:52,740 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:37:52,741 INFO L256 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:37:52,743 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:37:52,797 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-06 18:37:52,798 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:37:52,798 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 8 [2019-11-06 18:37:52,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636142934] [2019-11-06 18:37:52,799 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 18:37:52,799 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:37:52,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 18:37:52,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:37:52,802 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 8 states. [2019-11-06 18:37:52,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:37:52,936 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2019-11-06 18:37:52,936 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:37:52,937 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2019-11-06 18:37:52,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:37:52,938 INFO L225 Difference]: With dead ends: 41 [2019-11-06 18:37:52,941 INFO L226 Difference]: Without dead ends: 32 [2019-11-06 18:37:52,941 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:37:52,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-06 18:37:52,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2019-11-06 18:37:52,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-06 18:37:52,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-11-06 18:37:52,952 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 24 [2019-11-06 18:37:52,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:37:52,952 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-11-06 18:37:52,953 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 18:37:52,954 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-11-06 18:37:52,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-11-06 18:37:52,955 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:37:52,955 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:37:53,158 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:37:53,159 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:37:53,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:37:53,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1291933786, now seen corresponding path program 3 times [2019-11-06 18:37:53,161 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:37:53,161 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557806622] [2019-11-06 18:37:53,162 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:37:53,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:53,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:53,809 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:37:53,809 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557806622] [2019-11-06 18:37:53,809 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929701452] [2019-11-06 18:37:53,810 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 18:37:53,867 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:37:53,867 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:37:53,868 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 35 conjunts are in the unsatisfiable core [2019-11-06 18:37:53,871 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:37:54,503 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:37:54,504 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 17 treesize of output 18 [2019-11-06 18:37:54,505 INFO L496 ElimStorePlain]: Start of recursive call 2: 1 dim-0 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2019-11-06 18:37:54,516 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:37:54,517 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:37:54,522 INFO L496 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-11-06 18:37:54,523 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:32, output treesize:31 [2019-11-06 18:37:54,592 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:37:54,662 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:37:54,679 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:37:54,745 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:37:54,745 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:37:54,745 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 20] total 35 [2019-11-06 18:37:54,746 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976923436] [2019-11-06 18:37:54,746 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-06 18:37:54,746 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:37:54,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-06 18:37:54,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1080, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 18:37:54,748 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 35 states. [2019-11-06 18:37:56,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:37:56,109 INFO L93 Difference]: Finished difference Result 60 states and 66 transitions. [2019-11-06 18:37:56,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-06 18:37:56,109 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 28 [2019-11-06 18:37:56,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:37:56,111 INFO L225 Difference]: With dead ends: 60 [2019-11-06 18:37:56,111 INFO L226 Difference]: Without dead ends: 54 [2019-11-06 18:37:56,113 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=236, Invalid=2314, Unknown=0, NotChecked=0, Total=2550 [2019-11-06 18:37:56,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-06 18:37:56,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 34. [2019-11-06 18:37:56,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-06 18:37:56,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2019-11-06 18:37:56,121 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 28 [2019-11-06 18:37:56,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:37:56,122 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2019-11-06 18:37:56,122 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-06 18:37:56,122 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2019-11-06 18:37:56,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-06 18:37:56,123 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:37:56,123 INFO L410 BasicCegarLoop]: trace histogram [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 18:37:56,325 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:37:56,326 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:37:56,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:37:56,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1349523672, now seen corresponding path program 4 times [2019-11-06 18:37:56,327 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:37:56,328 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707861349] [2019-11-06 18:37:56,328 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:37:56,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:56,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:56,437 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 18:37:56,437 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707861349] [2019-11-06 18:37:56,437 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [382532028] [2019-11-06 18:37:56,437 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 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 18:37:56,486 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:37:56,487 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:37:56,487 INFO L256 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:37:56,490 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:37:56,563 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 18:37:56,564 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:37:56,564 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2019-11-06 18:37:56,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198500326] [2019-11-06 18:37:56,565 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 18:37:56,565 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:37:56,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 18:37:56,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:37:56,566 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 14 states. [2019-11-06 18:37:56,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:37:56,783 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2019-11-06 18:37:56,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-06 18:37:56,784 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 30 [2019-11-06 18:37:56,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:37:56,784 INFO L225 Difference]: With dead ends: 69 [2019-11-06 18:37:56,785 INFO L226 Difference]: Without dead ends: 43 [2019-11-06 18:37:56,785 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=231, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:37:56,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-11-06 18:37:56,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 33. [2019-11-06 18:37:56,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-06 18:37:56,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2019-11-06 18:37:56,796 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 30 [2019-11-06 18:37:56,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:37:56,797 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2019-11-06 18:37:56,797 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 18:37:56,797 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2019-11-06 18:37:56,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-06 18:37:56,798 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:37:56,798 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:37:57,005 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:37:57,006 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:37:57,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:37:57,007 INFO L82 PathProgramCache]: Analyzing trace with hash 28770966, now seen corresponding path program 5 times [2019-11-06 18:37:57,007 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:37:57,007 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200483955] [2019-11-06 18:37:57,008 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:37:57,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:57,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:57,095 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:37:57,096 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200483955] [2019-11-06 18:37:57,096 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2131773760] [2019-11-06 18:37:57,096 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 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 18:37:57,151 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-11-06 18:37:57,151 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:37:57,152 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:37:57,155 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:37:57,219 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:37:57,220 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:37:57,220 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 14 [2019-11-06 18:37:57,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145036002] [2019-11-06 18:37:57,221 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-06 18:37:57,221 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:37:57,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-06 18:37:57,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2019-11-06 18:37:57,222 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 14 states. [2019-11-06 18:37:57,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:37:57,482 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2019-11-06 18:37:57,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:37:57,482 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2019-11-06 18:37:57,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:37:57,483 INFO L225 Difference]: With dead ends: 42 [2019-11-06 18:37:57,484 INFO L226 Difference]: Without dead ends: 37 [2019-11-06 18:37:57,485 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=101, Invalid=319, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:37:57,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-06 18:37:57,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2019-11-06 18:37:57,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2019-11-06 18:37:57,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2019-11-06 18:37:57,492 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 32 [2019-11-06 18:37:57,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:37:57,492 INFO L462 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2019-11-06 18:37:57,492 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-06 18:37:57,492 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2019-11-06 18:37:57,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-06 18:37:57,493 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:37:57,493 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:37:57,696 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:37:57,697 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:37:57,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:37:57,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1369168876, now seen corresponding path program 6 times [2019-11-06 18:37:57,697 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:37:57,697 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547790016] [2019-11-06 18:37:57,697 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:37:57,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:59,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:37:59,262 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:37:59,263 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547790016] [2019-11-06 18:37:59,263 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755113647] [2019-11-06 18:37:59,263 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 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 18:37:59,330 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-11-06 18:37:59,330 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:37:59,331 INFO L256 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 44 conjunts are in the unsatisfiable core [2019-11-06 18:37:59,334 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:37:59,948 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:00,029 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:38:00,029 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:38:00,029 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 21] total 44 [2019-11-06 18:38:00,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663172912] [2019-11-06 18:38:00,030 INFO L442 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-11-06 18:38:00,030 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:38:00,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-11-06 18:38:00,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=1704, Unknown=0, NotChecked=0, Total=1892 [2019-11-06 18:38:00,032 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 44 states. [2019-11-06 18:38:04,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:38:04,098 INFO L93 Difference]: Finished difference Result 70 states and 76 transitions. [2019-11-06 18:38:04,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2019-11-06 18:38:04,098 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 34 [2019-11-06 18:38:04,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:38:04,102 INFO L225 Difference]: With dead ends: 70 [2019-11-06 18:38:04,102 INFO L226 Difference]: Without dead ends: 64 [2019-11-06 18:38:04,105 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1837 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=721, Invalid=5921, Unknown=0, NotChecked=0, Total=6642 [2019-11-06 18:38:04,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-06 18:38:04,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 40. [2019-11-06 18:38:04,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-06 18:38:04,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2019-11-06 18:38:04,114 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 34 [2019-11-06 18:38:04,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:38:04,114 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2019-11-06 18:38:04,115 INFO L463 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-11-06 18:38:04,115 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2019-11-06 18:38:04,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-11-06 18:38:04,116 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:38:04,116 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:38:04,319 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:38:04,320 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:38:04,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:38:04,320 INFO L82 PathProgramCache]: Analyzing trace with hash -464593390, now seen corresponding path program 7 times [2019-11-06 18:38:04,321 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:38:04,321 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1706760573] [2019-11-06 18:38:04,321 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:38:04,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:04,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:04,455 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:38:04,455 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1706760573] [2019-11-06 18:38:04,455 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [375781208] [2019-11-06 18:38:04,455 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 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 18:38:04,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:04,539 INFO L256 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:38:04,552 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:38:04,619 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:38:04,619 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:38:04,620 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 17 [2019-11-06 18:38:04,620 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825114611] [2019-11-06 18:38:04,620 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 18:38:04,621 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:38:04,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 18:38:04,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:38:04,621 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 17 states. [2019-11-06 18:38:04,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:38:04,870 INFO L93 Difference]: Finished difference Result 81 states and 87 transitions. [2019-11-06 18:38:04,870 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:38:04,870 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 36 [2019-11-06 18:38:04,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:38:04,872 INFO L225 Difference]: With dead ends: 81 [2019-11-06 18:38:04,872 INFO L226 Difference]: Without dead ends: 49 [2019-11-06 18:38:04,873 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=353, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:38:04,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-06 18:38:04,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 39. [2019-11-06 18:38:04,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2019-11-06 18:38:04,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2019-11-06 18:38:04,879 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 36 [2019-11-06 18:38:04,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:38:04,880 INFO L462 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2019-11-06 18:38:04,880 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 18:38:04,880 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2019-11-06 18:38:04,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-06 18:38:04,881 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:38:04,881 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:38:05,084 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:38:05,085 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:38:05,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:38:05,085 INFO L82 PathProgramCache]: Analyzing trace with hash 541401424, now seen corresponding path program 8 times [2019-11-06 18:38:05,086 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:38:05,086 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1086755733] [2019-11-06 18:38:05,087 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:38:05,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:05,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:05,261 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:38:05,261 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1086755733] [2019-11-06 18:38:05,261 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819123506] [2019-11-06 18:38:05,261 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 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 18:38:05,311 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:38:05,311 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:38:05,312 INFO L256 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:38:05,314 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:38:05,384 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:38:05,384 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:38:05,384 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 17 [2019-11-06 18:38:05,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411548728] [2019-11-06 18:38:05,385 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 18:38:05,385 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:38:05,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 18:38:05,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=202, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:38:05,386 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 17 states. [2019-11-06 18:38:05,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:38:05,675 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2019-11-06 18:38:05,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:38:05,676 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2019-11-06 18:38:05,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:38:05,677 INFO L225 Difference]: With dead ends: 48 [2019-11-06 18:38:05,677 INFO L226 Difference]: Without dead ends: 43 [2019-11-06 18:38:05,678 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=148, Invalid=502, Unknown=0, NotChecked=0, Total=650 [2019-11-06 18:38:05,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-11-06 18:38:05,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2019-11-06 18:38:05,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-11-06 18:38:05,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2019-11-06 18:38:05,685 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 38 [2019-11-06 18:38:05,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:38:05,686 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2019-11-06 18:38:05,686 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 18:38:05,686 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2019-11-06 18:38:05,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2019-11-06 18:38:05,687 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:38:05,687 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:38:05,890 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:38:05,891 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:38:05,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:38:05,891 INFO L82 PathProgramCache]: Analyzing trace with hash 1642429518, now seen corresponding path program 9 times [2019-11-06 18:38:05,892 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:38:05,892 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [318108963] [2019-11-06 18:38:05,892 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:38:05,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:06,675 WARN L191 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 39 [2019-11-06 18:38:06,907 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 35 [2019-11-06 18:38:07,061 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 39 [2019-11-06 18:38:07,361 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 44 [2019-11-06 18:38:07,759 WARN L191 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 46 [2019-11-06 18:38:07,902 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 45 [2019-11-06 18:38:09,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:09,163 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 4 proven. 44 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:38:09,164 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [318108963] [2019-11-06 18:38:09,164 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972986144] [2019-11-06 18:38:09,164 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 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 18:38:09,215 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-11-06 18:38:09,215 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:38:09,217 INFO L256 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 52 conjunts are in the unsatisfiable core [2019-11-06 18:38:09,220 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:38:09,262 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2019-11-06 18:38:09,263 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:38:09,269 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:38:09,269 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:38:09,270 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:21 [2019-11-06 18:38:10,696 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-11-06 18:38:10,701 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-11-06 18:38:10,703 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-11-06 18:38:10,705 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-06 18:38:10,707 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-11-06 18:38:10,729 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:38:10,730 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 46 treesize of output 69 [2019-11-06 18:38:10,732 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:10,732 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:10,733 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:10,733 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:10,734 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:10,735 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 4 xjuncts. [2019-11-06 18:38:10,783 INFO L567 ElimStorePlain]: treesize reduction 97, result has 26.5 percent of original size [2019-11-06 18:38:10,784 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:10,785 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 18:38:10,786 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:65, output treesize:19 [2019-11-06 18:38:10,856 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:10,932 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:10,958 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:11,071 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 7 proven. 32 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-06 18:38:11,072 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:38:11,072 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 26] total 57 [2019-11-06 18:38:11,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471131893] [2019-11-06 18:38:11,072 INFO L442 AbstractCegarLoop]: Interpolant automaton has 57 states [2019-11-06 18:38:11,073 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:38:11,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2019-11-06 18:38:11,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=2918, Unknown=0, NotChecked=0, Total=3192 [2019-11-06 18:38:11,074 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 57 states. [2019-11-06 18:38:12,855 WARN L191 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 68 [2019-11-06 18:38:13,635 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 47 [2019-11-06 18:38:13,868 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 48 [2019-11-06 18:38:14,094 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 57 [2019-11-06 18:38:14,861 WARN L191 SmtUtils]: Spent 278.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 87 [2019-11-06 18:38:15,814 WARN L191 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 59 [2019-11-06 18:38:16,072 WARN L191 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 50 [2019-11-06 18:38:16,320 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 51 [2019-11-06 18:38:16,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:38:16,994 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2019-11-06 18:38:16,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-06 18:38:16,995 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 40 [2019-11-06 18:38:16,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:38:16,996 INFO L225 Difference]: With dead ends: 59 [2019-11-06 18:38:16,996 INFO L226 Difference]: Without dead ends: 54 [2019-11-06 18:38:16,999 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2054 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=806, Invalid=7026, Unknown=0, NotChecked=0, Total=7832 [2019-11-06 18:38:17,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-06 18:38:17,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 46. [2019-11-06 18:38:17,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-06 18:38:17,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2019-11-06 18:38:17,008 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 40 [2019-11-06 18:38:17,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:38:17,008 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2019-11-06 18:38:17,008 INFO L463 AbstractCegarLoop]: Interpolant automaton has 57 states. [2019-11-06 18:38:17,008 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2019-11-06 18:38:17,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-06 18:38:17,009 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:38:17,009 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:38:17,212 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:38:17,212 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:38:17,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:38:17,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1126494260, now seen corresponding path program 10 times [2019-11-06 18:38:17,213 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:38:17,214 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1097638329] [2019-11-06 18:38:17,214 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:38:17,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:17,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:17,326 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 18 proven. 23 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:38:17,327 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1097638329] [2019-11-06 18:38:17,327 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594943214] [2019-11-06 18:38:17,327 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 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 18:38:17,392 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:38:17,392 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:38:17,393 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:38:17,401 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:38:17,501 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:38:17,501 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:38:17,501 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 20 [2019-11-06 18:38:17,502 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020332262] [2019-11-06 18:38:17,502 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 18:38:17,502 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:38:17,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 18:38:17,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:38:17,504 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 20 states. [2019-11-06 18:38:17,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:38:17,755 INFO L93 Difference]: Finished difference Result 93 states and 99 transitions. [2019-11-06 18:38:17,755 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:38:17,755 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2019-11-06 18:38:17,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:38:17,756 INFO L225 Difference]: With dead ends: 93 [2019-11-06 18:38:17,756 INFO L226 Difference]: Without dead ends: 55 [2019-11-06 18:38:17,757 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=150, Invalid=500, Unknown=0, NotChecked=0, Total=650 [2019-11-06 18:38:17,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-11-06 18:38:17,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 45. [2019-11-06 18:38:17,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-11-06 18:38:17,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2019-11-06 18:38:17,771 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 42 [2019-11-06 18:38:17,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:38:17,771 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2019-11-06 18:38:17,771 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 18:38:17,771 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2019-11-06 18:38:17,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-06 18:38:17,773 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:38:17,773 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:38:17,977 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:38:17,978 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:38:17,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:38:17,978 INFO L82 PathProgramCache]: Analyzing trace with hash 1911524490, now seen corresponding path program 11 times [2019-11-06 18:38:17,979 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:38:17,979 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320192079] [2019-11-06 18:38:17,980 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:38:17,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:18,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:18,091 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 9 proven. 32 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:38:18,091 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320192079] [2019-11-06 18:38:18,092 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [299807869] [2019-11-06 18:38:18,092 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 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 18:38:18,167 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-06 18:38:18,167 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:38:18,169 INFO L256 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:38:18,171 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:38:18,281 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 16 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:38:18,282 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:38:18,282 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 20 [2019-11-06 18:38:18,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444982069] [2019-11-06 18:38:18,283 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 18:38:18,283 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:38:18,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 18:38:18,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:38:18,284 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 20 states. [2019-11-06 18:38:18,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:38:18,650 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2019-11-06 18:38:18,650 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:38:18,650 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2019-11-06 18:38:18,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:38:18,651 INFO L225 Difference]: With dead ends: 54 [2019-11-06 18:38:18,652 INFO L226 Difference]: Without dead ends: 49 [2019-11-06 18:38:18,653 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=205, Invalid=725, Unknown=0, NotChecked=0, Total=930 [2019-11-06 18:38:18,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-06 18:38:18,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2019-11-06 18:38:18,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-11-06 18:38:18,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2019-11-06 18:38:18,661 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 44 [2019-11-06 18:38:18,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:38:18,662 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2019-11-06 18:38:18,662 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 18:38:18,662 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2019-11-06 18:38:18,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-11-06 18:38:18,662 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:38:18,663 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:38:18,872 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:38:18,872 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:38:18,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:38:18,873 INFO L82 PathProgramCache]: Analyzing trace with hash -224263928, now seen corresponding path program 12 times [2019-11-06 18:38:18,873 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:38:18,874 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043921493] [2019-11-06 18:38:18,874 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:38:18,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:19,958 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 46 [2019-11-06 18:38:20,101 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 46 [2019-11-06 18:38:21,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:21,339 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 12 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:38:21,339 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043921493] [2019-11-06 18:38:21,340 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [971139651] [2019-11-06 18:38:21,340 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 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 18:38:21,402 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 6 check-sat command(s) [2019-11-06 18:38:21,402 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:38:21,404 INFO L256 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 58 conjunts are in the unsatisfiable core [2019-11-06 18:38:21,405 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:38:21,451 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2019-11-06 18:38:21,451 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:38:21,459 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:38:21,459 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-11-06 18:38:21,460 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:21 [2019-11-06 18:38:23,184 INFO L172 IndexEqualityManager]: detected equality via solver [2019-11-06 18:38:23,198 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-11-06 18:38:23,199 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 27 treesize of output 36 [2019-11-06 18:38:23,200 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-11-06 18:38:23,232 INFO L567 ElimStorePlain]: treesize reduction 16, result has 69.2 percent of original size [2019-11-06 18:38:23,234 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:23,235 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 18:38:23,235 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:46, output treesize:20 [2019-11-06 18:38:23,324 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:23,416 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:23,436 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 18:38:23,566 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 50 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-06 18:38:23,566 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:38:23,566 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 30] total 63 [2019-11-06 18:38:23,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763328473] [2019-11-06 18:38:23,567 INFO L442 AbstractCegarLoop]: Interpolant automaton has 63 states [2019-11-06 18:38:23,567 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:38:23,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2019-11-06 18:38:23,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=396, Invalid=3510, Unknown=0, NotChecked=0, Total=3906 [2019-11-06 18:38:23,568 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand 63 states. [2019-11-06 18:38:28,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:38:28,862 INFO L93 Difference]: Finished difference Result 67 states and 70 transitions. [2019-11-06 18:38:28,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2019-11-06 18:38:28,862 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 46 [2019-11-06 18:38:28,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:38:28,864 INFO L225 Difference]: With dead ends: 67 [2019-11-06 18:38:28,864 INFO L226 Difference]: Without dead ends: 62 [2019-11-06 18:38:28,868 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2587 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=990, Invalid=8910, Unknown=0, NotChecked=0, Total=9900 [2019-11-06 18:38:28,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-11-06 18:38:28,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 52. [2019-11-06 18:38:28,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-06 18:38:28,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2019-11-06 18:38:28,877 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 46 [2019-11-06 18:38:28,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:38:28,877 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2019-11-06 18:38:28,878 INFO L463 AbstractCegarLoop]: Interpolant automaton has 63 states. [2019-11-06 18:38:28,878 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2019-11-06 18:38:28,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-11-06 18:38:28,878 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:38:28,879 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:38:29,081 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:38:29,082 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:38:29,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:38:29,083 INFO L82 PathProgramCache]: Analyzing trace with hash 277433862, now seen corresponding path program 13 times [2019-11-06 18:38:29,083 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:38:29,083 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765169303] [2019-11-06 18:38:29,083 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:38:29,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:29,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:29,222 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 27 proven. 34 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:38:29,222 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765169303] [2019-11-06 18:38:29,222 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808753978] [2019-11-06 18:38:29,223 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 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 18:38:29,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:29,295 INFO L256 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 18:38:29,296 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:38:29,413 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-11-06 18:38:29,414 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:38:29,414 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 23 [2019-11-06 18:38:29,414 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903591075] [2019-11-06 18:38:29,414 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 18:38:29,415 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:38:29,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 18:38:29,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=387, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:38:29,415 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 23 states. [2019-11-06 18:38:29,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:38:29,774 INFO L93 Difference]: Finished difference Result 105 states and 111 transitions. [2019-11-06 18:38:29,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 18:38:29,775 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 48 [2019-11-06 18:38:29,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:38:29,776 INFO L225 Difference]: With dead ends: 105 [2019-11-06 18:38:29,776 INFO L226 Difference]: Without dead ends: 61 [2019-11-06 18:38:29,777 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=198, Invalid=672, Unknown=0, NotChecked=0, Total=870 [2019-11-06 18:38:29,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-11-06 18:38:29,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 51. [2019-11-06 18:38:29,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-11-06 18:38:29,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2019-11-06 18:38:29,785 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 48 [2019-11-06 18:38:29,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:38:29,785 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2019-11-06 18:38:29,785 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 18:38:29,786 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2019-11-06 18:38:29,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-11-06 18:38:29,786 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:38:29,786 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:38:29,986 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:38:29,987 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:38:29,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:38:29,988 INFO L82 PathProgramCache]: Analyzing trace with hash 2021844036, now seen corresponding path program 14 times [2019-11-06 18:38:29,988 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:38:29,988 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [215460554] [2019-11-06 18:38:29,989 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:38:29,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:30,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:30,140 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:38:30,140 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [215460554] [2019-11-06 18:38:30,140 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1037794657] [2019-11-06 18:38:30,141 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 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 18:38:30,208 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:38:30,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:38:30,209 INFO L256 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 18:38:30,211 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:38:30,303 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 25 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:38:30,303 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:38:30,304 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 23 [2019-11-06 18:38:30,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276881809] [2019-11-06 18:38:30,304 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 18:38:30,304 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:38:30,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 18:38:30,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=382, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:38:30,305 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 23 states. [2019-11-06 18:38:30,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:38:30,740 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2019-11-06 18:38:30,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 18:38:30,740 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2019-11-06 18:38:30,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:38:30,741 INFO L225 Difference]: With dead ends: 60 [2019-11-06 18:38:30,741 INFO L226 Difference]: Without dead ends: 55 [2019-11-06 18:38:30,742 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=272, Invalid=988, Unknown=0, NotChecked=0, Total=1260 [2019-11-06 18:38:30,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-11-06 18:38:30,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 53. [2019-11-06 18:38:30,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-11-06 18:38:30,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2019-11-06 18:38:30,752 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 50 [2019-11-06 18:38:30,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:38:30,752 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2019-11-06 18:38:30,753 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 18:38:30,753 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2019-11-06 18:38:30,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-11-06 18:38:30,753 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:38:30,754 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:38:30,956 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:38:30,957 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:38:30,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:38:30,957 INFO L82 PathProgramCache]: Analyzing trace with hash -1581362622, now seen corresponding path program 15 times [2019-11-06 18:38:30,958 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:38:30,958 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696833357] [2019-11-06 18:38:30,958 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:38:30,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:38:32,494 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 48 [2019-11-06 18:38:32,652 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 51 [2019-11-06 18:38:32,803 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 51 [2019-11-06 18:38:32,974 WARN L191 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 50 [2019-11-06 18:38:33,149 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 51