/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/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-industry-pattern/nested-3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-23 22:10:02,548 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-23 22:10:02,551 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-23 22:10:02,570 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-23 22:10:02,570 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-23 22:10:02,572 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-23 22:10:02,575 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-23 22:10:02,584 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-23 22:10:02,588 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-23 22:10:02,591 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-23 22:10:02,593 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-23 22:10:02,595 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2019-11-23 22:10:02,637 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 [2019-11-23 22:10:02,669 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-23 22:10:02,669 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-23 22:10:02,673 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-23 22:10:02,674 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-23 22:10:02,674 INFO L138 SettingsManager]: * Use SBE=true [2019-11-23 22:10:02,674 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-23 22:10:02,674 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-23 22:10:02,675 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-23 22:10:02,675 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-23 22:10:02,675 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-23 22:10:02,675 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-23 22:10:02,675 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-23 22:10:02,675 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-23 22:10:02,676 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-11-23 22:10:02,678 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-23 22:10:02,679 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-23 22:10:02,679 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-23 22:10:02,679 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-23 22:10:02,679 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-23 22:10:02,679 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-23 22:10:02,680 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-23 22:10:02,680 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-23 22:10:02,680 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 22:10:02,680 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-23 22:10:02,680 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-23 22:10:02,681 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-23 22:10:02,683 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-23 22:10:02,683 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-23 22:10:02,683 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-23 22:10:02,684 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-23 22:10:02,949 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-23 22:10:02,961 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-23 22:10:02,964 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-23 22:10:02,966 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-23 22:10:02,966 INFO L275 PluginConnector]: CDTParser initialized [2019-11-23 22:10:02,967 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2019-11-23 22:10:03,043 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95a16a239/0dfa7b8ee86a42d6964c23c879003aa9/FLAG8a05b93fd [2019-11-23 22:10:03,440 INFO L306 CDTParser]: Found 1 translation units. [2019-11-23 22:10:03,441 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/nested-3.c [2019-11-23 22:10:03,446 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95a16a239/0dfa7b8ee86a42d6964c23c879003aa9/FLAG8a05b93fd [2019-11-23 22:10:03,860 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95a16a239/0dfa7b8ee86a42d6964c23c879003aa9 [2019-11-23 22:10:03,870 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-23 22:10:03,871 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-23 22:10:03,873 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-23 22:10:03,873 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-23 22:10:03,876 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-23 22:10:03,878 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 10:10:03" (1/1) ... [2019-11-23 22:10:03,880 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c926208 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:10:03, skipping insertion in model container [2019-11-23 22:10:03,881 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 10:10:03" (1/1) ... [2019-11-23 22:10:03,889 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-23 22:10:03,909 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-23 22:10:04,104 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 22:10:04,112 INFO L203 MainTranslator]: Completed pre-run [2019-11-23 22:10:04,135 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 22:10:04,147 INFO L208 MainTranslator]: Completed translation [2019-11-23 22:10:04,148 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:10:04 WrapperNode [2019-11-23 22:10:04,148 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-23 22:10:04,149 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-23 22:10:04,149 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-23 22:10:04,149 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-23 22:10:04,155 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:10:04" (1/1) ... [2019-11-23 22:10:04,160 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:10:04" (1/1) ... [2019-11-23 22:10:04,261 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-23 22:10:04,262 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-23 22:10:04,262 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-23 22:10:04,262 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-23 22:10:04,271 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:10:04" (1/1) ... [2019-11-23 22:10:04,272 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:10:04" (1/1) ... [2019-11-23 22:10:04,273 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:10:04" (1/1) ... [2019-11-23 22:10:04,273 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:10:04" (1/1) ... [2019-11-23 22:10:04,278 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:10:04" (1/1) ... [2019-11-23 22:10:04,284 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:10:04" (1/1) ... [2019-11-23 22:10:04,288 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:10:04" (1/1) ... [2019-11-23 22:10:04,290 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-23 22:10:04,290 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-23 22:10:04,291 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-23 22:10:04,293 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-23 22:10:04,295 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:10:04" (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 [2019-11-23 22:10:04,356 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-23 22:10:04,356 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-23 22:10:04,546 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-23 22:10:04,547 INFO L284 CfgBuilder]: Removed 8 assume(true) statements. [2019-11-23 22:10:04,548 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 10:10:04 BoogieIcfgContainer [2019-11-23 22:10:04,548 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-23 22:10:04,550 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-23 22:10:04,550 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-23 22:10:04,563 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-23 22:10:04,563 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 10:10:03" (1/3) ... [2019-11-23 22:10:04,568 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42fbc6e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 10:10:04, skipping insertion in model container [2019-11-23 22:10:04,568 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:10:04" (2/3) ... [2019-11-23 22:10:04,569 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@42fbc6e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 10:10:04, skipping insertion in model container [2019-11-23 22:10:04,569 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 10:10:04" (3/3) ... [2019-11-23 22:10:04,578 INFO L109 eAbstractionObserver]: Analyzing ICFG nested-3.c [2019-11-23 22:10:04,603 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-23 22:10:04,623 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-23 22:10:04,648 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-23 22:10:04,679 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-23 22:10:04,680 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-23 22:10:04,680 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-23 22:10:04,680 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-23 22:10:04,680 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-23 22:10:04,680 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-23 22:10:04,680 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-23 22:10:04,681 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-23 22:10:04,696 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2019-11-23 22:10:04,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-23 22:10:04,702 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:04,703 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:04,703 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:04,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:04,709 INFO L82 PathProgramCache]: Analyzing trace with hash 684167869, now seen corresponding path program 1 times [2019-11-23 22:10:04,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:04,717 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197069281] [2019-11-23 22:10:04,717 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:04,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:04,847 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:04,848 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197069281] [2019-11-23 22:10:04,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 22:10:04,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 22:10:04,851 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204549455] [2019-11-23 22:10:04,857 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 22:10:04,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:04,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 22:10:04,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 22:10:04,870 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2019-11-23 22:10:04,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:04,941 INFO L93 Difference]: Finished difference Result 29 states and 49 transitions. [2019-11-23 22:10:04,941 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 22:10:04,942 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2019-11-23 22:10:04,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:04,950 INFO L225 Difference]: With dead ends: 29 [2019-11-23 22:10:04,951 INFO L226 Difference]: Without dead ends: 16 [2019-11-23 22:10:04,954 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 22:10:04,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-23 22:10:04,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 13. [2019-11-23 22:10:04,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-11-23 22:10:04,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 17 transitions. [2019-11-23 22:10:04,986 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 17 transitions. Word has length 9 [2019-11-23 22:10:04,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:04,987 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 17 transitions. [2019-11-23 22:10:04,987 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 22:10:04,987 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 17 transitions. [2019-11-23 22:10:04,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-23 22:10:04,988 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:04,988 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:04,989 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:04,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:04,989 INFO L82 PathProgramCache]: Analyzing trace with hash 68919620, now seen corresponding path program 1 times [2019-11-23 22:10:04,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:04,990 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303103653] [2019-11-23 22:10:04,990 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:05,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:05,058 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:05,058 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303103653] [2019-11-23 22:10:05,059 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1503247051] [2019-11-23 22:10:05,059 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 [2019-11-23 22:10:05,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:05,096 INFO L255 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 2 conjunts are in the unsatisfiable core [2019-11-23 22:10:05,102 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:05,129 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 22:10:05,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-23 22:10:05,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2019-11-23 22:10:05,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716735896] [2019-11-23 22:10:05,133 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 22:10:05,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:05,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 22:10:05,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-23 22:10:05,137 INFO L87 Difference]: Start difference. First operand 13 states and 17 transitions. Second operand 3 states. [2019-11-23 22:10:05,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:05,179 INFO L93 Difference]: Finished difference Result 30 states and 39 transitions. [2019-11-23 22:10:05,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 22:10:05,180 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-23 22:10:05,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:05,181 INFO L225 Difference]: With dead ends: 30 [2019-11-23 22:10:05,181 INFO L226 Difference]: Without dead ends: 19 [2019-11-23 22:10:05,182 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-23 22:10:05,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-23 22:10:05,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2019-11-23 22:10:05,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-23 22:10:05,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 18 transitions. [2019-11-23 22:10:05,186 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 18 transitions. Word has length 12 [2019-11-23 22:10:05,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:05,187 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 18 transitions. [2019-11-23 22:10:05,187 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 22:10:05,187 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 18 transitions. [2019-11-23 22:10:05,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-23 22:10:05,188 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:05,188 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:05,391 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:05,392 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:05,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:05,393 INFO L82 PathProgramCache]: Analyzing trace with hash 68979202, now seen corresponding path program 1 times [2019-11-23 22:10:05,394 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:05,395 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406268484] [2019-11-23 22:10:05,395 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:05,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:05,440 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:05,440 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406268484] [2019-11-23 22:10:05,441 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [32439457] [2019-11-23 22:10:05,441 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-23 22:10:05,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:05,471 INFO L255 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 22:10:05,472 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:05,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:05,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:05,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 4 [2019-11-23 22:10:05,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310979299] [2019-11-23 22:10:05,479 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 22:10:05,479 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:05,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 22:10:05,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 22:10:05,480 INFO L87 Difference]: Start difference. First operand 14 states and 18 transitions. Second operand 4 states. [2019-11-23 22:10:05,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:05,547 INFO L93 Difference]: Finished difference Result 32 states and 43 transitions. [2019-11-23 22:10:05,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 22:10:05,549 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2019-11-23 22:10:05,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:05,550 INFO L225 Difference]: With dead ends: 32 [2019-11-23 22:10:05,550 INFO L226 Difference]: Without dead ends: 20 [2019-11-23 22:10:05,550 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 22:10:05,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-23 22:10:05,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2019-11-23 22:10:05,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-11-23 22:10:05,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 22 transitions. [2019-11-23 22:10:05,555 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 22 transitions. Word has length 12 [2019-11-23 22:10:05,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:05,555 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 22 transitions. [2019-11-23 22:10:05,555 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 22:10:05,555 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 22 transitions. [2019-11-23 22:10:05,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-23 22:10:05,556 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:05,556 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:05,757 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:05,757 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:05,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:05,758 INFO L82 PathProgramCache]: Analyzing trace with hash 2128812571, now seen corresponding path program 2 times [2019-11-23 22:10:05,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:05,758 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [945810448] [2019-11-23 22:10:05,758 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:05,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:05,855 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:05,855 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [945810448] [2019-11-23 22:10:05,856 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406816693] [2019-11-23 22:10:05,856 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 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 [2019-11-23 22:10:05,902 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 22:10:05,903 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:05,904 INFO L255 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-23 22:10:05,905 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:05,953 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-23 22:10:05,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:05,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 9 [2019-11-23 22:10:05,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754311919] [2019-11-23 22:10:05,956 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-23 22:10:05,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:05,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-23 22:10:05,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-11-23 22:10:05,958 INFO L87 Difference]: Start difference. First operand 17 states and 22 transitions. Second operand 9 states. [2019-11-23 22:10:06,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:06,210 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2019-11-23 22:10:06,210 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-23 22:10:06,211 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2019-11-23 22:10:06,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:06,212 INFO L225 Difference]: With dead ends: 68 [2019-11-23 22:10:06,212 INFO L226 Difference]: Without dead ends: 53 [2019-11-23 22:10:06,213 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2019-11-23 22:10:06,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-11-23 22:10:06,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 29. [2019-11-23 22:10:06,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-11-23 22:10:06,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 38 transitions. [2019-11-23 22:10:06,220 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 38 transitions. Word has length 15 [2019-11-23 22:10:06,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:06,220 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 38 transitions. [2019-11-23 22:10:06,220 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-23 22:10:06,221 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 38 transitions. [2019-11-23 22:10:06,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-23 22:10:06,221 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:06,222 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:06,433 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:06,433 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:06,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:06,434 INFO L82 PathProgramCache]: Analyzing trace with hash 2130659613, now seen corresponding path program 1 times [2019-11-23 22:10:06,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:06,436 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426771476] [2019-11-23 22:10:06,436 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:06,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:06,487 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:06,487 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426771476] [2019-11-23 22:10:06,488 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540322961] [2019-11-23 22:10:06,488 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:06,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:06,521 INFO L255 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 22:10:06,522 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:06,548 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:06,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-23 22:10:06,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2019-11-23 22:10:06,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144540261] [2019-11-23 22:10:06,549 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 22:10:06,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:06,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 22:10:06,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-11-23 22:10:06,550 INFO L87 Difference]: Start difference. First operand 29 states and 38 transitions. Second operand 4 states. [2019-11-23 22:10:06,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:06,602 INFO L93 Difference]: Finished difference Result 83 states and 108 transitions. [2019-11-23 22:10:06,602 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 22:10:06,603 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-11-23 22:10:06,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:06,604 INFO L225 Difference]: With dead ends: 83 [2019-11-23 22:10:06,604 INFO L226 Difference]: Without dead ends: 56 [2019-11-23 22:10:06,604 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-11-23 22:10:06,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-23 22:10:06,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 38. [2019-11-23 22:10:06,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-23 22:10:06,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 50 transitions. [2019-11-23 22:10:06,613 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 50 transitions. Word has length 15 [2019-11-23 22:10:06,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:06,613 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 50 transitions. [2019-11-23 22:10:06,613 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 22:10:06,613 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 50 transitions. [2019-11-23 22:10:06,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-23 22:10:06,614 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:06,614 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:06,819 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:06,819 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:06,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:06,819 INFO L82 PathProgramCache]: Analyzing trace with hash 1321312987, now seen corresponding path program 1 times [2019-11-23 22:10:06,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:06,820 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67868086] [2019-11-23 22:10:06,820 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:06,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:06,862 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:06,863 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67868086] [2019-11-23 22:10:06,863 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773432965] [2019-11-23 22:10:06,863 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-23 22:10:06,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:06,895 INFO L255 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-23 22:10:06,896 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:06,900 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:06,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:06,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2019-11-23 22:10:06,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283410593] [2019-11-23 22:10:06,901 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-23 22:10:06,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:06,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-23 22:10:06,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 22:10:06,902 INFO L87 Difference]: Start difference. First operand 38 states and 50 transitions. Second operand 5 states. [2019-11-23 22:10:06,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:06,962 INFO L93 Difference]: Finished difference Result 94 states and 126 transitions. [2019-11-23 22:10:06,962 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-23 22:10:06,962 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2019-11-23 22:10:06,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:06,963 INFO L225 Difference]: With dead ends: 94 [2019-11-23 22:10:06,963 INFO L226 Difference]: Without dead ends: 58 [2019-11-23 22:10:06,964 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 22:10:06,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-23 22:10:06,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 49. [2019-11-23 22:10:06,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-23 22:10:06,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 63 transitions. [2019-11-23 22:10:06,973 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 63 transitions. Word has length 15 [2019-11-23 22:10:06,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:06,973 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 63 transitions. [2019-11-23 22:10:06,974 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-23 22:10:06,974 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 63 transitions. [2019-11-23 22:10:06,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-23 22:10:06,975 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:06,975 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:07,175 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:07,176 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:07,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:07,177 INFO L82 PathProgramCache]: Analyzing trace with hash 25548196, now seen corresponding path program 2 times [2019-11-23 22:10:07,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:07,177 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396859857] [2019-11-23 22:10:07,178 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:07,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:07,249 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:07,249 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396859857] [2019-11-23 22:10:07,249 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249150642] [2019-11-23 22:10:07,250 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 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 [2019-11-23 22:10:07,276 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 22:10:07,276 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:07,277 INFO L255 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-23 22:10:07,278 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:07,283 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:07,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:07,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2019-11-23 22:10:07,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313516823] [2019-11-23 22:10:07,284 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-23 22:10:07,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:07,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-23 22:10:07,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-23 22:10:07,285 INFO L87 Difference]: Start difference. First operand 49 states and 63 transitions. Second operand 6 states. [2019-11-23 22:10:07,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:07,381 INFO L93 Difference]: Finished difference Result 117 states and 153 transitions. [2019-11-23 22:10:07,383 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-23 22:10:07,384 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2019-11-23 22:10:07,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:07,385 INFO L225 Difference]: With dead ends: 117 [2019-11-23 22:10:07,385 INFO L226 Difference]: Without dead ends: 70 [2019-11-23 22:10:07,385 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-23 22:10:07,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-23 22:10:07,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 61. [2019-11-23 22:10:07,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-11-23 22:10:07,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 77 transitions. [2019-11-23 22:10:07,403 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 77 transitions. Word has length 18 [2019-11-23 22:10:07,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:07,403 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 77 transitions. [2019-11-23 22:10:07,403 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-23 22:10:07,403 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 77 transitions. [2019-11-23 22:10:07,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-23 22:10:07,404 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:07,404 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:07,608 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:07,609 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:07,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:07,609 INFO L82 PathProgramCache]: Analyzing trace with hash 1062715963, now seen corresponding path program 3 times [2019-11-23 22:10:07,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:07,610 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [101240657] [2019-11-23 22:10:07,610 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:07,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:07,673 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:07,674 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [101240657] [2019-11-23 22:10:07,674 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291552757] [2019-11-23 22:10:07,674 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 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 [2019-11-23 22:10:07,707 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-23 22:10:07,708 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:07,709 INFO L255 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-23 22:10:07,710 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:07,784 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-23 22:10:07,805 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-23 22:10:07,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-23 22:10:07,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [7] total 13 [2019-11-23 22:10:07,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707722038] [2019-11-23 22:10:07,807 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-23 22:10:07,807 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:07,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-23 22:10:07,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2019-11-23 22:10:07,808 INFO L87 Difference]: Start difference. First operand 61 states and 77 transitions. Second operand 8 states. [2019-11-23 22:10:07,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:07,935 INFO L93 Difference]: Finished difference Result 161 states and 203 transitions. [2019-11-23 22:10:07,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-23 22:10:07,935 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2019-11-23 22:10:07,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:07,938 INFO L225 Difference]: With dead ends: 161 [2019-11-23 22:10:07,939 INFO L226 Difference]: Without dead ends: 159 [2019-11-23 22:10:07,939 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2019-11-23 22:10:07,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2019-11-23 22:10:07,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 104. [2019-11-23 22:10:07,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2019-11-23 22:10:07,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 130 transitions. [2019-11-23 22:10:07,955 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 130 transitions. Word has length 21 [2019-11-23 22:10:07,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:07,955 INFO L462 AbstractCegarLoop]: Abstraction has 104 states and 130 transitions. [2019-11-23 22:10:07,955 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-23 22:10:07,956 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 130 transitions. [2019-11-23 22:10:07,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-23 22:10:07,956 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:07,957 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:08,160 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:08,165 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:08,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:08,165 INFO L82 PathProgramCache]: Analyzing trace with hash 483638269, now seen corresponding path program 1 times [2019-11-23 22:10:08,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:08,166 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910005941] [2019-11-23 22:10:08,166 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:08,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:08,257 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:08,258 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910005941] [2019-11-23 22:10:08,258 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [954749309] [2019-11-23 22:10:08,258 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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) [2019-11-23 22:10:08,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:08,293 INFO L255 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-23 22:10:08,295 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:08,348 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:08,349 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:08,349 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 12 [2019-11-23 22:10:08,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449952554] [2019-11-23 22:10:08,350 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-23 22:10:08,350 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:08,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-23 22:10:08,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2019-11-23 22:10:08,350 INFO L87 Difference]: Start difference. First operand 104 states and 130 transitions. Second operand 12 states. [2019-11-23 22:10:08,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:08,569 INFO L93 Difference]: Finished difference Result 235 states and 296 transitions. [2019-11-23 22:10:08,569 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-23 22:10:08,569 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2019-11-23 22:10:08,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:08,570 INFO L225 Difference]: With dead ends: 235 [2019-11-23 22:10:08,571 INFO L226 Difference]: Without dead ends: 166 [2019-11-23 22:10:08,573 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=125, Invalid=255, Unknown=0, NotChecked=0, Total=380 [2019-11-23 22:10:08,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2019-11-23 22:10:08,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 125. [2019-11-23 22:10:08,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2019-11-23 22:10:08,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 154 transitions. [2019-11-23 22:10:08,607 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 154 transitions. Word has length 21 [2019-11-23 22:10:08,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:08,607 INFO L462 AbstractCegarLoop]: Abstraction has 125 states and 154 transitions. [2019-11-23 22:10:08,607 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-23 22:10:08,608 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 154 transitions. [2019-11-23 22:10:08,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-23 22:10:08,610 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:08,610 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:08,815 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:08,815 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:08,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:08,816 INFO L82 PathProgramCache]: Analyzing trace with hash 2101787646, now seen corresponding path program 2 times [2019-11-23 22:10:08,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:08,816 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279222006] [2019-11-23 22:10:08,816 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:08,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:08,904 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:08,904 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279222006] [2019-11-23 22:10:08,904 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887278676] [2019-11-23 22:10:08,904 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 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 [2019-11-23 22:10:08,939 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 22:10:08,939 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:08,940 INFO L255 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-23 22:10:08,942 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:08,967 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-23 22:10:08,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:08,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 12 [2019-11-23 22:10:08,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960310592] [2019-11-23 22:10:08,968 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-23 22:10:08,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:08,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-23 22:10:08,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2019-11-23 22:10:08,969 INFO L87 Difference]: Start difference. First operand 125 states and 154 transitions. Second operand 12 states. [2019-11-23 22:10:09,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:09,323 INFO L93 Difference]: Finished difference Result 359 states and 445 transitions. [2019-11-23 22:10:09,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-23 22:10:09,323 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 24 [2019-11-23 22:10:09,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:09,325 INFO L225 Difference]: With dead ends: 359 [2019-11-23 22:10:09,325 INFO L226 Difference]: Without dead ends: 288 [2019-11-23 22:10:09,329 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=135, Invalid=327, Unknown=0, NotChecked=0, Total=462 [2019-11-23 22:10:09,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2019-11-23 22:10:09,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 119. [2019-11-23 22:10:09,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2019-11-23 22:10:09,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 148 transitions. [2019-11-23 22:10:09,353 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 148 transitions. Word has length 24 [2019-11-23 22:10:09,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:09,353 INFO L462 AbstractCegarLoop]: Abstraction has 119 states and 148 transitions. [2019-11-23 22:10:09,353 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-23 22:10:09,354 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 148 transitions. [2019-11-23 22:10:09,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-23 22:10:09,356 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:09,358 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:09,563 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:09,564 INFO L410 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:09,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:09,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1524556994, now seen corresponding path program 3 times [2019-11-23 22:10:09,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:09,565 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345745031] [2019-11-23 22:10:09,565 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:09,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:09,628 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:09,629 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345745031] [2019-11-23 22:10:09,629 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387261588] [2019-11-23 22:10:09,630 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 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 [2019-11-23 22:10:09,655 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-23 22:10:09,655 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:09,656 INFO L255 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-23 22:10:09,657 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:09,678 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-11-23 22:10:09,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-23 22:10:09,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 12 [2019-11-23 22:10:09,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350160995] [2019-11-23 22:10:09,680 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 22:10:09,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:09,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 22:10:09,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2019-11-23 22:10:09,681 INFO L87 Difference]: Start difference. First operand 119 states and 148 transitions. Second operand 4 states. [2019-11-23 22:10:09,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:09,751 INFO L93 Difference]: Finished difference Result 239 states and 292 transitions. [2019-11-23 22:10:09,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-23 22:10:09,752 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 24 [2019-11-23 22:10:09,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:09,753 INFO L225 Difference]: With dead ends: 239 [2019-11-23 22:10:09,753 INFO L226 Difference]: Without dead ends: 171 [2019-11-23 22:10:09,754 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2019-11-23 22:10:09,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2019-11-23 22:10:09,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 125. [2019-11-23 22:10:09,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2019-11-23 22:10:09,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 154 transitions. [2019-11-23 22:10:09,765 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 154 transitions. Word has length 24 [2019-11-23 22:10:09,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:09,765 INFO L462 AbstractCegarLoop]: Abstraction has 125 states and 154 transitions. [2019-11-23 22:10:09,765 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 22:10:09,765 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 154 transitions. [2019-11-23 22:10:09,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-23 22:10:09,766 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:09,766 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:09,974 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:09,974 INFO L410 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:09,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:09,975 INFO L82 PathProgramCache]: Analyzing trace with hash 1322786370, now seen corresponding path program 4 times [2019-11-23 22:10:09,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:09,975 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803116081] [2019-11-23 22:10:09,975 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:09,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:10,019 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:10,019 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803116081] [2019-11-23 22:10:10,019 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472568893] [2019-11-23 22:10:10,019 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 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 [2019-11-23 22:10:10,041 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 22:10:10,041 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:10,042 INFO L255 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-23 22:10:10,043 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:10,049 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:10,049 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:10,049 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 8 [2019-11-23 22:10:10,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497528233] [2019-11-23 22:10:10,050 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-23 22:10:10,050 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:10,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-23 22:10:10,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-23 22:10:10,051 INFO L87 Difference]: Start difference. First operand 125 states and 154 transitions. Second operand 8 states. [2019-11-23 22:10:10,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:10,132 INFO L93 Difference]: Finished difference Result 248 states and 312 transitions. [2019-11-23 22:10:10,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-23 22:10:10,132 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2019-11-23 22:10:10,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:10,134 INFO L225 Difference]: With dead ends: 248 [2019-11-23 22:10:10,134 INFO L226 Difference]: Without dead ends: 166 [2019-11-23 22:10:10,134 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-23 22:10:10,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2019-11-23 22:10:10,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 146. [2019-11-23 22:10:10,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2019-11-23 22:10:10,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 178 transitions. [2019-11-23 22:10:10,145 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 178 transitions. Word has length 24 [2019-11-23 22:10:10,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:10,145 INFO L462 AbstractCegarLoop]: Abstraction has 146 states and 178 transitions. [2019-11-23 22:10:10,146 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-23 22:10:10,146 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 178 transitions. [2019-11-23 22:10:10,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-23 22:10:10,147 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:10,147 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:10,349 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:10,350 INFO L410 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:10,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:10,351 INFO L82 PathProgramCache]: Analyzing trace with hash 1668645725, now seen corresponding path program 5 times [2019-11-23 22:10:10,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:10,351 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678682033] [2019-11-23 22:10:10,352 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:10,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:10,411 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:10,411 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678682033] [2019-11-23 22:10:10,412 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [906082709] [2019-11-23 22:10:10,412 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 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 [2019-11-23 22:10:10,442 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-11-23 22:10:10,442 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:10,442 INFO L255 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-23 22:10:10,443 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:10,449 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:10,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:10,450 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 9 [2019-11-23 22:10:10,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936255957] [2019-11-23 22:10:10,450 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-23 22:10:10,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:10,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-23 22:10:10,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2019-11-23 22:10:10,451 INFO L87 Difference]: Start difference. First operand 146 states and 178 transitions. Second operand 9 states. [2019-11-23 22:10:10,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:10,541 INFO L93 Difference]: Finished difference Result 281 states and 350 transitions. [2019-11-23 22:10:10,542 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-23 22:10:10,542 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2019-11-23 22:10:10,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:10,543 INFO L225 Difference]: With dead ends: 281 [2019-11-23 22:10:10,544 INFO L226 Difference]: Without dead ends: 187 [2019-11-23 22:10:10,544 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2019-11-23 22:10:10,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2019-11-23 22:10:10,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 167. [2019-11-23 22:10:10,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2019-11-23 22:10:10,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 202 transitions. [2019-11-23 22:10:10,559 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 202 transitions. Word has length 27 [2019-11-23 22:10:10,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:10,559 INFO L462 AbstractCegarLoop]: Abstraction has 167 states and 202 transitions. [2019-11-23 22:10:10,559 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-23 22:10:10,559 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 202 transitions. [2019-11-23 22:10:10,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-23 22:10:10,560 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:10,560 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:10,772 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:10,772 INFO L410 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:10,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:10,773 INFO L82 PathProgramCache]: Analyzing trace with hash 1538147426, now seen corresponding path program 6 times [2019-11-23 22:10:10,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:10,773 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944315730] [2019-11-23 22:10:10,773 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:10,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:10,850 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:10,851 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944315730] [2019-11-23 22:10:10,851 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1868818388] [2019-11-23 22:10:10,851 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 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 [2019-11-23 22:10:10,894 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-11-23 22:10:10,894 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:10,895 INFO L255 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-23 22:10:10,897 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:10,982 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-23 22:10:10,999 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2019-11-23 22:10:11,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-23 22:10:11,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [10] total 16 [2019-11-23 22:10:11,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121921675] [2019-11-23 22:10:11,001 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-23 22:10:11,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:11,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-23 22:10:11,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2019-11-23 22:10:11,002 INFO L87 Difference]: Start difference. First operand 167 states and 202 transitions. Second operand 8 states. [2019-11-23 22:10:11,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:11,121 INFO L93 Difference]: Finished difference Result 240 states and 288 transitions. [2019-11-23 22:10:11,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-23 22:10:11,121 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 30 [2019-11-23 22:10:11,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:11,123 INFO L225 Difference]: With dead ends: 240 [2019-11-23 22:10:11,123 INFO L226 Difference]: Without dead ends: 238 [2019-11-23 22:10:11,124 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2019-11-23 22:10:11,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2019-11-23 22:10:11,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 167. [2019-11-23 22:10:11,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2019-11-23 22:10:11,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 202 transitions. [2019-11-23 22:10:11,135 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 202 transitions. Word has length 30 [2019-11-23 22:10:11,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:11,135 INFO L462 AbstractCegarLoop]: Abstraction has 167 states and 202 transitions. [2019-11-23 22:10:11,135 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-23 22:10:11,136 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 202 transitions. [2019-11-23 22:10:11,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-23 22:10:11,136 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:11,136 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:11,339 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:11,340 INFO L410 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:11,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:11,340 INFO L82 PathProgramCache]: Analyzing trace with hash 730588260, now seen corresponding path program 1 times [2019-11-23 22:10:11,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:11,341 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916040114] [2019-11-23 22:10:11,341 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:11,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:11,377 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2019-11-23 22:10:11,377 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916040114] [2019-11-23 22:10:11,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 22:10:11,377 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-23 22:10:11,378 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114829453] [2019-11-23 22:10:11,378 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-23 22:10:11,378 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:11,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-23 22:10:11,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 22:10:11,378 INFO L87 Difference]: Start difference. First operand 167 states and 202 transitions. Second operand 4 states. [2019-11-23 22:10:11,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:11,396 INFO L93 Difference]: Finished difference Result 274 states and 332 transitions. [2019-11-23 22:10:11,399 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 22:10:11,399 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 30 [2019-11-23 22:10:11,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:11,400 INFO L225 Difference]: With dead ends: 274 [2019-11-23 22:10:11,400 INFO L226 Difference]: Without dead ends: 179 [2019-11-23 22:10:11,401 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-23 22:10:11,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2019-11-23 22:10:11,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 163. [2019-11-23 22:10:11,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2019-11-23 22:10:11,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 196 transitions. [2019-11-23 22:10:11,411 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 196 transitions. Word has length 30 [2019-11-23 22:10:11,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:11,412 INFO L462 AbstractCegarLoop]: Abstraction has 163 states and 196 transitions. [2019-11-23 22:10:11,412 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-23 22:10:11,412 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 196 transitions. [2019-11-23 22:10:11,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-11-23 22:10:11,413 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:11,413 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 12, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2019-11-23 22:10:11,413 INFO L410 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:11,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:11,414 INFO L82 PathProgramCache]: Analyzing trace with hash -1716954031, now seen corresponding path program 1 times [2019-11-23 22:10:11,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:11,414 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209332655] [2019-11-23 22:10:11,414 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:11,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:11,659 INFO L134 CoverageAnalysis]: Checked inductivity of 307 backedges. 18 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:11,659 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209332655] [2019-11-23 22:10:11,659 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425277626] [2019-11-23 22:10:11,660 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-23 22:10:11,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:11,694 INFO L255 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-23 22:10:11,696 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:11,807 INFO L134 CoverageAnalysis]: Checked inductivity of 307 backedges. 163 proven. 70 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2019-11-23 22:10:11,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:11,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10] total 27 [2019-11-23 22:10:11,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914678366] [2019-11-23 22:10:11,808 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-23 22:10:11,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:11,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-23 22:10:11,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=503, Unknown=0, NotChecked=0, Total=702 [2019-11-23 22:10:11,809 INFO L87 Difference]: Start difference. First operand 163 states and 196 transitions. Second operand 27 states. [2019-11-23 22:10:12,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:12,270 INFO L93 Difference]: Finished difference Result 381 states and 453 transitions. [2019-11-23 22:10:12,270 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-23 22:10:12,270 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 57 [2019-11-23 22:10:12,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:12,272 INFO L225 Difference]: With dead ends: 381 [2019-11-23 22:10:12,272 INFO L226 Difference]: Without dead ends: 279 [2019-11-23 22:10:12,274 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=579, Invalid=1583, Unknown=0, NotChecked=0, Total=2162 [2019-11-23 22:10:12,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2019-11-23 22:10:12,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 184. [2019-11-23 22:10:12,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2019-11-23 22:10:12,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 220 transitions. [2019-11-23 22:10:12,288 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 220 transitions. Word has length 57 [2019-11-23 22:10:12,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:12,288 INFO L462 AbstractCegarLoop]: Abstraction has 184 states and 220 transitions. [2019-11-23 22:10:12,288 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-23 22:10:12,288 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 220 transitions. [2019-11-23 22:10:12,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-11-23 22:10:12,289 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:12,290 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 14, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2019-11-23 22:10:12,493 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:12,493 INFO L410 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:12,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:12,494 INFO L82 PathProgramCache]: Analyzing trace with hash -1043308475, now seen corresponding path program 2 times [2019-11-23 22:10:12,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:12,495 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [276209162] [2019-11-23 22:10:12,495 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:12,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:12,767 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 20 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:12,767 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [276209162] [2019-11-23 22:10:12,767 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1735013367] [2019-11-23 22:10:12,768 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:12,795 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 22:10:12,795 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:12,796 INFO L255 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-23 22:10:12,798 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:12,931 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 210 proven. 92 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2019-11-23 22:10:12,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:12,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 11] total 30 [2019-11-23 22:10:12,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801781702] [2019-11-23 22:10:12,932 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-23 22:10:12,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:12,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-23 22:10:12,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=246, Invalid=624, Unknown=0, NotChecked=0, Total=870 [2019-11-23 22:10:12,933 INFO L87 Difference]: Start difference. First operand 184 states and 220 transitions. Second operand 30 states. [2019-11-23 22:10:13,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:13,516 INFO L93 Difference]: Finished difference Result 441 states and 518 transitions. [2019-11-23 22:10:13,516 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-11-23 22:10:13,516 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 63 [2019-11-23 22:10:13,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:13,518 INFO L225 Difference]: With dead ends: 441 [2019-11-23 22:10:13,518 INFO L226 Difference]: Without dead ends: 327 [2019-11-23 22:10:13,520 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 804 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=796, Invalid=2174, Unknown=0, NotChecked=0, Total=2970 [2019-11-23 22:10:13,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2019-11-23 22:10:13,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 205. [2019-11-23 22:10:13,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 205 states. [2019-11-23 22:10:13,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 244 transitions. [2019-11-23 22:10:13,533 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 244 transitions. Word has length 63 [2019-11-23 22:10:13,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:13,533 INFO L462 AbstractCegarLoop]: Abstraction has 205 states and 244 transitions. [2019-11-23 22:10:13,533 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-23 22:10:13,533 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 244 transitions. [2019-11-23 22:10:13,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-11-23 22:10:13,534 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:13,534 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2019-11-23 22:10:13,746 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:13,746 INFO L410 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:13,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:13,746 INFO L82 PathProgramCache]: Analyzing trace with hash -305796463, now seen corresponding path program 3 times [2019-11-23 22:10:13,747 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:13,747 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560559632] [2019-11-23 22:10:13,747 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:13,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:14,021 INFO L134 CoverageAnalysis]: Checked inductivity of 501 backedges. 22 proven. 479 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:14,021 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560559632] [2019-11-23 22:10:14,022 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1123492843] [2019-11-23 22:10:14,022 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:14,049 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-23 22:10:14,049 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:14,050 INFO L255 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-23 22:10:14,053 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:14,164 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-23 22:10:14,184 INFO L134 CoverageAnalysis]: Checked inductivity of 501 backedges. 25 proven. 267 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2019-11-23 22:10:14,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:14,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 9] total 31 [2019-11-23 22:10:14,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [999859789] [2019-11-23 22:10:14,185 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-23 22:10:14,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:14,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-23 22:10:14,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=766, Unknown=0, NotChecked=0, Total=930 [2019-11-23 22:10:14,186 INFO L87 Difference]: Start difference. First operand 205 states and 244 transitions. Second operand 31 states. [2019-11-23 22:10:18,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:18,964 INFO L93 Difference]: Finished difference Result 1317 states and 1526 transitions. [2019-11-23 22:10:18,965 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 162 states. [2019-11-23 22:10:18,965 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2019-11-23 22:10:18,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:18,970 INFO L225 Difference]: With dead ends: 1317 [2019-11-23 22:10:18,971 INFO L226 Difference]: Without dead ends: 1256 [2019-11-23 22:10:18,979 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12440 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4477, Invalid=25625, Unknown=0, NotChecked=0, Total=30102 [2019-11-23 22:10:18,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1256 states. [2019-11-23 22:10:19,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1256 to 526. [2019-11-23 22:10:19,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 526 states. [2019-11-23 22:10:19,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 526 states to 526 states and 615 transitions. [2019-11-23 22:10:19,025 INFO L78 Accepts]: Start accepts. Automaton has 526 states and 615 transitions. Word has length 69 [2019-11-23 22:10:19,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:19,025 INFO L462 AbstractCegarLoop]: Abstraction has 526 states and 615 transitions. [2019-11-23 22:10:19,025 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-23 22:10:19,025 INFO L276 IsEmpty]: Start isEmpty. Operand 526 states and 615 transitions. [2019-11-23 22:10:19,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-11-23 22:10:19,027 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:19,027 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 16, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:19,230 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:19,231 INFO L410 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:19,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:19,231 INFO L82 PathProgramCache]: Analyzing trace with hash -1470416881, now seen corresponding path program 1 times [2019-11-23 22:10:19,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:19,232 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610345357] [2019-11-23 22:10:19,232 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:19,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:19,620 INFO L134 CoverageAnalysis]: Checked inductivity of 501 backedges. 106 proven. 395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:19,621 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610345357] [2019-11-23 22:10:19,621 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [793051008] [2019-11-23 22:10:19,621 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:19,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:19,665 INFO L255 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-23 22:10:19,667 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:19,862 INFO L134 CoverageAnalysis]: Checked inductivity of 501 backedges. 263 proven. 117 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-11-23 22:10:19,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:19,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 12] total 35 [2019-11-23 22:10:19,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919406073] [2019-11-23 22:10:19,863 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-23 22:10:19,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:19,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-23 22:10:19,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=1001, Unknown=0, NotChecked=0, Total=1190 [2019-11-23 22:10:19,864 INFO L87 Difference]: Start difference. First operand 526 states and 615 transitions. Second operand 35 states. [2019-11-23 22:10:21,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:21,663 INFO L93 Difference]: Finished difference Result 1047 states and 1217 transitions. [2019-11-23 22:10:21,663 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2019-11-23 22:10:21,663 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 69 [2019-11-23 22:10:21,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:21,666 INFO L225 Difference]: With dead ends: 1047 [2019-11-23 22:10:21,667 INFO L226 Difference]: Without dead ends: 623 [2019-11-23 22:10:21,670 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3358 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2290, Invalid=7810, Unknown=0, NotChecked=0, Total=10100 [2019-11-23 22:10:21,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 623 states. [2019-11-23 22:10:21,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 623 to 353. [2019-11-23 22:10:21,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 353 states. [2019-11-23 22:10:21,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 421 transitions. [2019-11-23 22:10:21,694 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 421 transitions. Word has length 69 [2019-11-23 22:10:21,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:21,694 INFO L462 AbstractCegarLoop]: Abstraction has 353 states and 421 transitions. [2019-11-23 22:10:21,694 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-23 22:10:21,695 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 421 transitions. [2019-11-23 22:10:21,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-11-23 22:10:21,696 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:21,696 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:21,900 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:21,900 INFO L410 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:21,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:21,901 INFO L82 PathProgramCache]: Analyzing trace with hash 1403882695, now seen corresponding path program 2 times [2019-11-23 22:10:21,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:21,902 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144775942] [2019-11-23 22:10:21,902 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:21,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:22,319 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 132 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:22,319 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144775942] [2019-11-23 22:10:22,319 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1076233777] [2019-11-23 22:10:22,320 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:22,351 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 22:10:22,352 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:22,354 INFO L255 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-23 22:10:22,355 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:22,408 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 5 proven. 151 refuted. 0 times theorem prover too weak. 460 trivial. 0 not checked. [2019-11-23 22:10:22,408 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:22,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 7] total 32 [2019-11-23 22:10:22,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748348964] [2019-11-23 22:10:22,409 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-11-23 22:10:22,409 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:22,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-11-23 22:10:22,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=828, Unknown=0, NotChecked=0, Total=992 [2019-11-23 22:10:22,410 INFO L87 Difference]: Start difference. First operand 353 states and 421 transitions. Second operand 32 states. [2019-11-23 22:10:25,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:25,141 INFO L93 Difference]: Finished difference Result 1964 states and 2245 transitions. [2019-11-23 22:10:25,141 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 85 states. [2019-11-23 22:10:25,141 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 75 [2019-11-23 22:10:25,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:25,148 INFO L225 Difference]: With dead ends: 1964 [2019-11-23 22:10:25,149 INFO L226 Difference]: Without dead ends: 1797 [2019-11-23 22:10:25,153 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3540 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2824, Invalid=8948, Unknown=0, NotChecked=0, Total=11772 [2019-11-23 22:10:25,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1797 states. [2019-11-23 22:10:25,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1797 to 641. [2019-11-23 22:10:25,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 641 states. [2019-11-23 22:10:25,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 641 states to 641 states and 753 transitions. [2019-11-23 22:10:25,215 INFO L78 Accepts]: Start accepts. Automaton has 641 states and 753 transitions. Word has length 75 [2019-11-23 22:10:25,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:25,215 INFO L462 AbstractCegarLoop]: Abstraction has 641 states and 753 transitions. [2019-11-23 22:10:25,215 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-11-23 22:10:25,216 INFO L276 IsEmpty]: Start isEmpty. Operand 641 states and 753 transitions. [2019-11-23 22:10:25,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-11-23 22:10:25,217 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:25,217 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:25,421 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:25,421 INFO L410 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:25,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:25,421 INFO L82 PathProgramCache]: Analyzing trace with hash -961569397, now seen corresponding path program 3 times [2019-11-23 22:10:25,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:25,421 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947224744] [2019-11-23 22:10:25,421 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:25,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:25,754 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 132 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:25,755 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947224744] [2019-11-23 22:10:25,755 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857848165] [2019-11-23 22:10:25,755 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:25,784 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-23 22:10:25,784 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:25,785 INFO L255 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-23 22:10:25,786 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:25,923 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-23 22:10:25,954 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 28 proven. 326 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2019-11-23 22:10:25,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:25,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 9] total 37 [2019-11-23 22:10:25,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299394921] [2019-11-23 22:10:25,955 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-11-23 22:10:25,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:25,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-11-23 22:10:25,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1169, Unknown=0, NotChecked=0, Total=1332 [2019-11-23 22:10:25,956 INFO L87 Difference]: Start difference. First operand 641 states and 753 transitions. Second operand 37 states. [2019-11-23 22:10:32,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:32,675 INFO L93 Difference]: Finished difference Result 2159 states and 2439 transitions. [2019-11-23 22:10:32,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 186 states. [2019-11-23 22:10:32,675 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 75 [2019-11-23 22:10:32,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:32,683 INFO L225 Difference]: With dead ends: 2159 [2019-11-23 22:10:32,683 INFO L226 Difference]: Without dead ends: 1843 [2019-11-23 22:10:32,687 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18603 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=6504, Invalid=40368, Unknown=0, NotChecked=0, Total=46872 [2019-11-23 22:10:32,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1843 states. [2019-11-23 22:10:32,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1843 to 866. [2019-11-23 22:10:32,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 866 states. [2019-11-23 22:10:32,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 866 states to 866 states and 1008 transitions. [2019-11-23 22:10:32,778 INFO L78 Accepts]: Start accepts. Automaton has 866 states and 1008 transitions. Word has length 75 [2019-11-23 22:10:32,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:32,779 INFO L462 AbstractCegarLoop]: Abstraction has 866 states and 1008 transitions. [2019-11-23 22:10:32,779 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-11-23 22:10:32,779 INFO L276 IsEmpty]: Start isEmpty. Operand 866 states and 1008 transitions. [2019-11-23 22:10:32,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-11-23 22:10:32,781 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:32,781 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 18, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:32,984 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:32,984 INFO L410 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:32,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:32,985 INFO L82 PathProgramCache]: Analyzing trace with hash 1379949895, now seen corresponding path program 4 times [2019-11-23 22:10:32,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:32,986 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920863759] [2019-11-23 22:10:32,986 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:32,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:33,266 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 304 proven. 312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:33,267 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920863759] [2019-11-23 22:10:33,267 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2453155] [2019-11-23 22:10:33,267 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:33,295 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 22:10:33,296 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:33,297 INFO L255 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-23 22:10:33,298 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:33,514 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 451 proven. 39 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2019-11-23 22:10:33,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:33,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 14] total 39 [2019-11-23 22:10:33,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450600569] [2019-11-23 22:10:33,515 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-11-23 22:10:33,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:33,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-11-23 22:10:33,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=332, Invalid=1150, Unknown=0, NotChecked=0, Total=1482 [2019-11-23 22:10:33,516 INFO L87 Difference]: Start difference. First operand 866 states and 1008 transitions. Second operand 39 states. [2019-11-23 22:10:36,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:36,149 INFO L93 Difference]: Finished difference Result 1957 states and 2278 transitions. [2019-11-23 22:10:36,150 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2019-11-23 22:10:36,150 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 75 [2019-11-23 22:10:36,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:36,154 INFO L225 Difference]: With dead ends: 1957 [2019-11-23 22:10:36,155 INFO L226 Difference]: Without dead ends: 1460 [2019-11-23 22:10:36,156 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4138 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1548, Invalid=10884, Unknown=0, NotChecked=0, Total=12432 [2019-11-23 22:10:36,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1460 states. [2019-11-23 22:10:36,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1460 to 1178. [2019-11-23 22:10:36,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1178 states. [2019-11-23 22:10:36,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1178 states to 1178 states and 1364 transitions. [2019-11-23 22:10:36,268 INFO L78 Accepts]: Start accepts. Automaton has 1178 states and 1364 transitions. Word has length 75 [2019-11-23 22:10:36,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:36,269 INFO L462 AbstractCegarLoop]: Abstraction has 1178 states and 1364 transitions. [2019-11-23 22:10:36,269 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-11-23 22:10:36,269 INFO L276 IsEmpty]: Start isEmpty. Operand 1178 states and 1364 transitions. [2019-11-23 22:10:36,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-11-23 22:10:36,271 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:36,271 INFO L410 BasicCegarLoop]: trace histogram [21, 21, 20, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:36,475 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:36,475 INFO L410 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:36,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:36,476 INFO L82 PathProgramCache]: Analyzing trace with hash -2097897522, now seen corresponding path program 5 times [2019-11-23 22:10:36,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:36,476 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453437828] [2019-11-23 22:10:36,476 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:36,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:36,687 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 353 proven. 324 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 22:10:36,687 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453437828] [2019-11-23 22:10:36,688 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1154053851] [2019-11-23 22:10:36,688 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:36,722 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-23 22:10:36,722 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:36,723 INFO L255 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-23 22:10:36,725 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:36,734 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 353 proven. 176 refuted. 0 times theorem prover too weak. 149 trivial. 0 not checked. [2019-11-23 22:10:36,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:36,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 14] total 26 [2019-11-23 22:10:36,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018637305] [2019-11-23 22:10:36,735 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-23 22:10:36,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:36,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-23 22:10:36,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2019-11-23 22:10:36,736 INFO L87 Difference]: Start difference. First operand 1178 states and 1364 transitions. Second operand 26 states. [2019-11-23 22:10:37,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:37,188 INFO L93 Difference]: Finished difference Result 2214 states and 2607 transitions. [2019-11-23 22:10:37,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-23 22:10:37,188 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 78 [2019-11-23 22:10:37,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:37,191 INFO L225 Difference]: With dead ends: 2214 [2019-11-23 22:10:37,191 INFO L226 Difference]: Without dead ends: 1147 [2019-11-23 22:10:37,193 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 456 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=460, Invalid=946, Unknown=0, NotChecked=0, Total=1406 [2019-11-23 22:10:37,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1147 states. [2019-11-23 22:10:37,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1147 to 936. [2019-11-23 22:10:37,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 936 states. [2019-11-23 22:10:37,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 936 states to 936 states and 1079 transitions. [2019-11-23 22:10:37,265 INFO L78 Accepts]: Start accepts. Automaton has 936 states and 1079 transitions. Word has length 78 [2019-11-23 22:10:37,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:37,265 INFO L462 AbstractCegarLoop]: Abstraction has 936 states and 1079 transitions. [2019-11-23 22:10:37,265 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-23 22:10:37,265 INFO L276 IsEmpty]: Start isEmpty. Operand 936 states and 1079 transitions. [2019-11-23 22:10:37,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-11-23 22:10:37,267 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:37,267 INFO L410 BasicCegarLoop]: trace histogram [24, 24, 22, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:10:37,470 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:37,471 INFO L410 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:37,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:37,471 INFO L82 PathProgramCache]: Analyzing trace with hash -1325122485, now seen corresponding path program 6 times [2019-11-23 22:10:37,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:37,472 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35644969] [2019-11-23 22:10:37,472 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:37,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:37,743 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 436 proven. 446 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:37,744 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35644969] [2019-11-23 22:10:37,744 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1475218223] [2019-11-23 22:10:37,744 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:37,776 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-11-23 22:10:37,776 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:37,777 INFO L255 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-23 22:10:37,778 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:37,887 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-23 22:10:37,920 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 34 proven. 462 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2019-11-23 22:10:37,920 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:37,921 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 9] total 38 [2019-11-23 22:10:37,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155794733] [2019-11-23 22:10:37,921 INFO L442 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-11-23 22:10:37,921 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:37,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-11-23 22:10:37,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=1048, Unknown=0, NotChecked=0, Total=1406 [2019-11-23 22:10:37,922 INFO L87 Difference]: Start difference. First operand 936 states and 1079 transitions. Second operand 38 states. [2019-11-23 22:10:41,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:41,246 INFO L93 Difference]: Finished difference Result 1409 states and 1601 transitions. [2019-11-23 22:10:41,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2019-11-23 22:10:41,247 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 87 [2019-11-23 22:10:41,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:41,250 INFO L225 Difference]: With dead ends: 1409 [2019-11-23 22:10:41,250 INFO L226 Difference]: Without dead ends: 1351 [2019-11-23 22:10:41,252 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9891 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2853, Invalid=21953, Unknown=0, NotChecked=0, Total=24806 [2019-11-23 22:10:41,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1351 states. [2019-11-23 22:10:41,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1351 to 985. [2019-11-23 22:10:41,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 985 states. [2019-11-23 22:10:41,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 985 states to 985 states and 1136 transitions. [2019-11-23 22:10:41,338 INFO L78 Accepts]: Start accepts. Automaton has 985 states and 1136 transitions. Word has length 87 [2019-11-23 22:10:41,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:41,338 INFO L462 AbstractCegarLoop]: Abstraction has 985 states and 1136 transitions. [2019-11-23 22:10:41,338 INFO L463 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-11-23 22:10:41,339 INFO L276 IsEmpty]: Start isEmpty. Operand 985 states and 1136 transitions. [2019-11-23 22:10:41,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2019-11-23 22:10:41,341 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:41,342 INFO L410 BasicCegarLoop]: trace histogram [36, 36, 33, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1] [2019-11-23 22:10:41,545 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:41,546 INFO L410 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:41,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:41,546 INFO L82 PathProgramCache]: Analyzing trace with hash -223846065, now seen corresponding path program 4 times [2019-11-23 22:10:41,546 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:41,546 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362589143] [2019-11-23 22:10:41,546 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:41,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:42,397 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 40 proven. 1976 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:42,398 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362589143] [2019-11-23 22:10:42,398 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26057375] [2019-11-23 22:10:42,398 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:42,447 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 22:10:42,448 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:42,448 INFO L255 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-23 22:10:42,450 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:42,717 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 916 proven. 210 refuted. 0 times theorem prover too weak. 890 trivial. 0 not checked. [2019-11-23 22:10:42,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:42,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 15] total 56 [2019-11-23 22:10:42,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858991186] [2019-11-23 22:10:42,718 INFO L442 AbstractCegarLoop]: Interpolant automaton has 56 states [2019-11-23 22:10:42,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:42,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2019-11-23 22:10:42,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=591, Invalid=2489, Unknown=0, NotChecked=0, Total=3080 [2019-11-23 22:10:42,719 INFO L87 Difference]: Start difference. First operand 985 states and 1136 transitions. Second operand 56 states. [2019-11-23 22:10:44,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:44,018 INFO L93 Difference]: Finished difference Result 2280 states and 2613 transitions. [2019-11-23 22:10:44,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2019-11-23 22:10:44,018 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 129 [2019-11-23 22:10:44,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:44,022 INFO L225 Difference]: With dead ends: 2280 [2019-11-23 22:10:44,022 INFO L226 Difference]: Without dead ends: 1452 [2019-11-23 22:10:44,023 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2201 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1616, Invalid=6574, Unknown=0, NotChecked=0, Total=8190 [2019-11-23 22:10:44,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1452 states. [2019-11-23 22:10:44,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1452 to 993. [2019-11-23 22:10:44,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 993 states. [2019-11-23 22:10:44,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 993 states to 993 states and 1144 transitions. [2019-11-23 22:10:44,084 INFO L78 Accepts]: Start accepts. Automaton has 993 states and 1144 transitions. Word has length 129 [2019-11-23 22:10:44,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:44,084 INFO L462 AbstractCegarLoop]: Abstraction has 993 states and 1144 transitions. [2019-11-23 22:10:44,084 INFO L463 AbstractCegarLoop]: Interpolant automaton has 56 states. [2019-11-23 22:10:44,084 INFO L276 IsEmpty]: Start isEmpty. Operand 993 states and 1144 transitions. [2019-11-23 22:10:44,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2019-11-23 22:10:44,087 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:44,087 INFO L410 BasicCegarLoop]: trace histogram [39, 39, 36, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1] [2019-11-23 22:10:44,291 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:44,292 INFO L410 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:44,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:44,292 INFO L82 PathProgramCache]: Analyzing trace with hash 1824110052, now seen corresponding path program 5 times [2019-11-23 22:10:44,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:44,292 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290028278] [2019-11-23 22:10:44,292 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:44,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:45,037 INFO L134 CoverageAnalysis]: Checked inductivity of 2358 backedges. 42 proven. 2316 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:10:45,037 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290028278] [2019-11-23 22:10:45,049 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [533797286] [2019-11-23 22:10:45,049 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:45,107 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2019-11-23 22:10:45,107 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:45,108 INFO L255 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-23 22:10:45,110 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:45,487 INFO L134 CoverageAnalysis]: Checked inductivity of 2358 backedges. 1156 proven. 222 refuted. 0 times theorem prover too weak. 980 trivial. 0 not checked. [2019-11-23 22:10:45,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:45,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 18] total 63 [2019-11-23 22:10:45,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112268223] [2019-11-23 22:10:45,488 INFO L442 AbstractCegarLoop]: Interpolant automaton has 63 states [2019-11-23 22:10:45,488 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:45,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2019-11-23 22:10:45,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=518, Invalid=3388, Unknown=0, NotChecked=0, Total=3906 [2019-11-23 22:10:45,488 INFO L87 Difference]: Start difference. First operand 993 states and 1144 transitions. Second operand 63 states. [2019-11-23 22:10:48,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:48,461 INFO L93 Difference]: Finished difference Result 4408 states and 4966 transitions. [2019-11-23 22:10:48,462 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-11-23 22:10:48,462 INFO L78 Accepts]: Start accepts. Automaton has 63 states. Word has length 138 [2019-11-23 22:10:48,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:48,472 INFO L225 Difference]: With dead ends: 4408 [2019-11-23 22:10:48,472 INFO L226 Difference]: Without dead ends: 3813 [2019-11-23 22:10:48,474 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 149 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2233 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1100, Invalid=7090, Unknown=0, NotChecked=0, Total=8190 [2019-11-23 22:10:48,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3813 states. [2019-11-23 22:10:48,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3813 to 2122. [2019-11-23 22:10:48,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2122 states. [2019-11-23 22:10:48,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2122 states to 2122 states and 2379 transitions. [2019-11-23 22:10:48,657 INFO L78 Accepts]: Start accepts. Automaton has 2122 states and 2379 transitions. Word has length 138 [2019-11-23 22:10:48,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:48,657 INFO L462 AbstractCegarLoop]: Abstraction has 2122 states and 2379 transitions. [2019-11-23 22:10:48,657 INFO L463 AbstractCegarLoop]: Interpolant automaton has 63 states. [2019-11-23 22:10:48,657 INFO L276 IsEmpty]: Start isEmpty. Operand 2122 states and 2379 transitions. [2019-11-23 22:10:48,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2019-11-23 22:10:48,660 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:10:48,661 INFO L410 BasicCegarLoop]: trace histogram [39, 39, 36, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1] [2019-11-23 22:10:48,864 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:48,864 INFO L410 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:10:48,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:10:48,865 INFO L82 PathProgramCache]: Analyzing trace with hash -533651168, now seen corresponding path program 6 times [2019-11-23 22:10:48,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:10:48,865 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993492694] [2019-11-23 22:10:48,866 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:10:48,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:10:49,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2358 backedges. 82 proven. 2272 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 22:10:49,668 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993492694] [2019-11-23 22:10:49,668 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [391229547] [2019-11-23 22:10:49,668 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:49,696 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-11-23 22:10:49,696 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:10:49,698 INFO L255 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-23 22:10:49,700 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:10:49,727 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-23 22:10:49,810 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-23 22:10:49,840 INFO L134 CoverageAnalysis]: Checked inductivity of 2358 backedges. 1115 proven. 1 refuted. 0 times theorem prover too weak. 1242 trivial. 0 not checked. [2019-11-23 22:10:49,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:10:49,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 8] total 51 [2019-11-23 22:10:49,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796791682] [2019-11-23 22:10:49,841 INFO L442 AbstractCegarLoop]: Interpolant automaton has 51 states [2019-11-23 22:10:49,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:10:49,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2019-11-23 22:10:49,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=366, Invalid=2184, Unknown=0, NotChecked=0, Total=2550 [2019-11-23 22:10:49,842 INFO L87 Difference]: Start difference. First operand 2122 states and 2379 transitions. Second operand 51 states. [2019-11-23 22:10:58,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:10:58,614 INFO L93 Difference]: Finished difference Result 5116 states and 5832 transitions. [2019-11-23 22:10:58,615 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 171 states. [2019-11-23 22:10:58,615 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 138 [2019-11-23 22:10:58,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:10:58,615 INFO L225 Difference]: With dead ends: 5116 [2019-11-23 22:10:58,615 INFO L226 Difference]: Without dead ends: 0 [2019-11-23 22:10:58,621 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17113 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=11925, Invalid=34947, Unknown=0, NotChecked=0, Total=46872 [2019-11-23 22:10:58,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2019-11-23 22:10:58,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2019-11-23 22:10:58,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2019-11-23 22:10:58,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2019-11-23 22:10:58,622 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 138 [2019-11-23 22:10:58,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:10:58,622 INFO L462 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2019-11-23 22:10:58,622 INFO L463 AbstractCegarLoop]: Interpolant automaton has 51 states. [2019-11-23 22:10:58,623 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2019-11-23 22:10:58,623 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2019-11-23 22:10:58,826 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:10:58,831 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions.