/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_12.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 18:45:00,689 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 18:45:00,692 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 18:45:00,733 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 18:45:00,745 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 18:45:00,747 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 18:45:00,748 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 18:45:00,749 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 18:45:00,750 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 18:45:00,751 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 18:45:00,753 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 18:45:00,757 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 18:45:00,759 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 18:45:00,762 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 18:45:00,764 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 18:45:00,765 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 18:45:00,773 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 18:45:00,792 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 18:45:00,793 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 18:45:00,794 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 18:45:00,795 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 [2020-10-23 18:45:00,871 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 18:45:00,872 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 18:45:00,874 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-23 18:45:00,874 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-23 18:45:00,875 INFO L138 SettingsManager]: * Use SBE=true [2020-10-23 18:45:00,875 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 18:45:00,875 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 18:45:00,875 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 18:45:00,875 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 18:45:00,876 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 18:45:00,876 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 18:45:00,877 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 18:45:00,877 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 18:45:00,877 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 18:45:00,877 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 18:45:00,877 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 18:45:00,877 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 18:45:00,878 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 18:45:00,878 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-23 18:45:00,878 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 18:45:00,878 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 18:45:00,878 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 18:45:00,879 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 18:45:00,879 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-23 18:45:00,879 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-23 18:45:00,879 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-23 18:45:00,879 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-23 18:45:00,880 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 18:45:00,880 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-23 18:45:00,881 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 18:45:01,296 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 18:45:01,342 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 18:45:01,345 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 18:45:01,347 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 18:45:01,347 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 18:45:01,348 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_12.c [2020-10-23 18:45:01,426 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ad3895627/69c7517b6a2c49d1b9d225cc499e9353/FLAGa640d1d30 [2020-10-23 18:45:01,992 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 18:45:01,993 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_12.c [2020-10-23 18:45:02,000 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ad3895627/69c7517b6a2c49d1b9d225cc499e9353/FLAGa640d1d30 [2020-10-23 18:45:02,361 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ad3895627/69c7517b6a2c49d1b9d225cc499e9353 [2020-10-23 18:45:02,364 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 18:45:02,371 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 18:45:02,377 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 18:45:02,378 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 18:45:02,382 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 18:45:02,383 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:45:02" (1/1) ... [2020-10-23 18:45:02,386 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@496d4727 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:45:02, skipping insertion in model container [2020-10-23 18:45:02,386 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:45:02" (1/1) ... [2020-10-23 18:45:02,395 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 18:45:02,409 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 18:45:02,587 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:45:02,598 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 18:45:02,616 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:45:02,633 INFO L208 MainTranslator]: Completed translation [2020-10-23 18:45:02,634 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:45:02 WrapperNode [2020-10-23 18:45:02,634 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 18:45:02,635 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 18:45:02,636 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 18:45:02,636 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 18:45:02,650 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:45:02" (1/1) ... [2020-10-23 18:45:02,650 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:45:02" (1/1) ... [2020-10-23 18:45:02,658 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:45:02" (1/1) ... [2020-10-23 18:45:02,658 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:45:02" (1/1) ... [2020-10-23 18:45:02,664 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:45:02" (1/1) ... [2020-10-23 18:45:02,668 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:45:02" (1/1) ... [2020-10-23 18:45:02,670 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:45:02" (1/1) ... [2020-10-23 18:45:02,672 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 18:45:02,673 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 18:45:02,673 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 18:45:02,673 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 18:45:02,674 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:45:02" (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 [2020-10-23 18:45:02,763 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 18:45:02,763 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 18:45:02,764 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 18:45:02,764 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 18:45:02,764 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 18:45:02,764 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 18:45:02,764 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 18:45:02,764 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 18:45:02,765 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 18:45:02,765 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 18:45:02,765 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 18:45:02,765 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 18:45:02,765 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 18:45:02,765 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 18:45:02,766 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 18:45:02,766 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 18:45:02,766 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 18:45:03,200 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 18:45:03,201 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-23 18:45:03,203 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:45:03 BoogieIcfgContainer [2020-10-23 18:45:03,203 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 18:45:03,208 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 18:45:03,208 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 18:45:03,212 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 18:45:03,212 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 06:45:02" (1/3) ... [2020-10-23 18:45:03,214 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66e7407f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:45:03, skipping insertion in model container [2020-10-23 18:45:03,214 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:45:02" (2/3) ... [2020-10-23 18:45:03,214 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66e7407f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:45:03, skipping insertion in model container [2020-10-23 18:45:03,215 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:45:03" (3/3) ... [2020-10-23 18:45:03,217 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_12.c [2020-10-23 18:45:03,229 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-23 18:45:03,239 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 18:45:03,254 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 18:45:03,294 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 18:45:03,295 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 18:45:03,295 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-23 18:45:03,295 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 18:45:03,295 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 18:45:03,296 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 18:45:03,296 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 18:45:03,296 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 18:45:03,327 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-10-23 18:45:03,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-10-23 18:45:03,334 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:03,335 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:03,335 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:03,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:03,345 INFO L82 PathProgramCache]: Analyzing trace with hash 1507135652, now seen corresponding path program 1 times [2020-10-23 18:45:03,358 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:03,359 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332160713] [2020-10-23 18:45:03,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:03,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:03,793 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-10-23 18:45:03,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:03,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:03,815 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:45:03,816 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332160713] [2020-10-23 18:45:03,817 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:45:03,817 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-23 18:45:03,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483323982] [2020-10-23 18:45:03,823 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-23 18:45:03,823 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:45:03,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-23 18:45:03,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 18:45:03,841 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-10-23 18:45:03,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:45:03,913 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-10-23 18:45:03,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-23 18:45:03,915 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-10-23 18:45:03,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:45:03,923 INFO L225 Difference]: With dead ends: 38 [2020-10-23 18:45:03,923 INFO L226 Difference]: Without dead ends: 15 [2020-10-23 18:45:03,926 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 18:45:03,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-10-23 18:45:03,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-10-23 18:45:03,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-10-23 18:45:03,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-10-23 18:45:03,969 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2020-10-23 18:45:03,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:45:03,970 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-10-23 18:45:03,970 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-23 18:45:03,970 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-10-23 18:45:03,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-10-23 18:45:03,971 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:03,971 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:03,972 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 18:45:03,972 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:03,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:03,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1192214991, now seen corresponding path program 1 times [2020-10-23 18:45:03,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:03,973 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718223329] [2020-10-23 18:45:03,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:04,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:04,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:04,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:04,116 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:45:04,117 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718223329] [2020-10-23 18:45:04,117 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:45:04,118 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 18:45:04,118 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422226978] [2020-10-23 18:45:04,119 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 18:45:04,120 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:45:04,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 18:45:04,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 18:45:04,121 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 6 states. [2020-10-23 18:45:04,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:45:04,314 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-10-23 18:45:04,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:45:04,315 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2020-10-23 18:45:04,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:45:04,316 INFO L225 Difference]: With dead ends: 24 [2020-10-23 18:45:04,316 INFO L226 Difference]: Without dead ends: 18 [2020-10-23 18:45:04,317 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:45:04,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-10-23 18:45:04,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-10-23 18:45:04,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-10-23 18:45:04,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-10-23 18:45:04,326 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 12 [2020-10-23 18:45:04,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:45:04,326 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-10-23 18:45:04,326 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 18:45:04,326 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-10-23 18:45:04,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-23 18:45:04,327 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:04,327 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:04,327 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 18:45:04,328 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:04,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:04,328 INFO L82 PathProgramCache]: Analyzing trace with hash -1953512822, now seen corresponding path program 1 times [2020-10-23 18:45:04,329 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:04,329 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364749760] [2020-10-23 18:45:04,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:04,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:04,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:04,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:04,428 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:45:04,429 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364749760] [2020-10-23 18:45:04,429 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:45:04,430 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-23 18:45:04,430 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384329639] [2020-10-23 18:45:04,430 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-23 18:45:04,431 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:45:04,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-23 18:45:04,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-23 18:45:04,432 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2020-10-23 18:45:04,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:45:04,515 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-10-23 18:45:04,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-23 18:45:04,516 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-10-23 18:45:04,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:45:04,516 INFO L225 Difference]: With dead ends: 30 [2020-10-23 18:45:04,517 INFO L226 Difference]: Without dead ends: 21 [2020-10-23 18:45:04,517 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-23 18:45:04,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-10-23 18:45:04,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2020-10-23 18:45:04,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-10-23 18:45:04,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-10-23 18:45:04,525 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2020-10-23 18:45:04,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:45:04,526 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-10-23 18:45:04,526 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-23 18:45:04,526 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-10-23 18:45:04,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-10-23 18:45:04,527 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:04,527 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:04,527 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 18:45:04,527 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:04,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:04,528 INFO L82 PathProgramCache]: Analyzing trace with hash 556673393, now seen corresponding path program 1 times [2020-10-23 18:45:04,528 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:04,529 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266882405] [2020-10-23 18:45:04,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:04,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:04,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:04,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:04,673 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:45:04,673 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266882405] [2020-10-23 18:45:04,674 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854258058] [2020-10-23 18:45:04,674 INFO L95 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 [2020-10-23 18:45:04,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:04,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 5 conjunts are in the unsatisfiable core [2020-10-23 18:45:04,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:45:04,890 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:45:04,891 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:45:04,891 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-10-23 18:45:04,891 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569981431] [2020-10-23 18:45:04,892 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 18:45:04,892 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:45:04,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 18:45:04,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-10-23 18:45:04,893 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-10-23 18:45:05,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:45:05,095 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2020-10-23 18:45:05,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-23 18:45:05,095 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 18 [2020-10-23 18:45:05,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:45:05,096 INFO L225 Difference]: With dead ends: 33 [2020-10-23 18:45:05,097 INFO L226 Difference]: Without dead ends: 24 [2020-10-23 18:45:05,098 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2020-10-23 18:45:05,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-10-23 18:45:05,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-10-23 18:45:05,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-10-23 18:45:05,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-10-23 18:45:05,105 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 18 [2020-10-23 18:45:05,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:45:05,106 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-10-23 18:45:05,106 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 18:45:05,106 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-10-23 18:45:05,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-23 18:45:05,107 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:05,107 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:05,321 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:05,322 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:05,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:05,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1838613802, now seen corresponding path program 2 times [2020-10-23 18:45:05,324 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:05,325 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102814988] [2020-10-23 18:45:05,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:05,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:05,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:05,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:05,506 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:45:05,506 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102814988] [2020-10-23 18:45:05,507 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [296667866] [2020-10-23 18:45:05,507 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:05,595 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-23 18:45:05,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:45:05,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-23 18:45:05,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:45:05,696 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:45:05,696 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:45:05,696 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-10-23 18:45:05,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [160890256] [2020-10-23 18:45:05,697 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-23 18:45:05,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:45:05,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-23 18:45:05,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-23 18:45:05,704 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 7 states. [2020-10-23 18:45:05,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:45:05,900 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-10-23 18:45:05,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:45:05,900 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-10-23 18:45:05,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:45:05,902 INFO L225 Difference]: With dead ends: 36 [2020-10-23 18:45:05,902 INFO L226 Difference]: Without dead ends: 27 [2020-10-23 18:45:05,903 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-10-23 18:45:05,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-10-23 18:45:05,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2020-10-23 18:45:05,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-23 18:45:05,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-10-23 18:45:05,910 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2020-10-23 18:45:05,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:45:05,910 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-10-23 18:45:05,911 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-23 18:45:05,911 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-10-23 18:45:05,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-23 18:45:05,912 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:05,912 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:06,126 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:06,127 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:06,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:06,128 INFO L82 PathProgramCache]: Analyzing trace with hash 1276142289, now seen corresponding path program 3 times [2020-10-23 18:45:06,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:06,129 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855978007] [2020-10-23 18:45:06,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:06,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:06,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:06,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:06,353 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:45:06,354 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855978007] [2020-10-23 18:45:06,354 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [839887116] [2020-10-23 18:45:06,354 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:06,409 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-10-23 18:45:06,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:45:06,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-23 18:45:06,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:45:06,479 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-10-23 18:45:06,479 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:45:06,479 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2020-10-23 18:45:06,480 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203171636] [2020-10-23 18:45:06,480 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-23 18:45:06,480 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:45:06,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-23 18:45:06,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2020-10-23 18:45:06,482 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 11 states. [2020-10-23 18:45:07,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:45:07,058 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2020-10-23 18:45:07,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-23 18:45:07,059 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 24 [2020-10-23 18:45:07,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:45:07,060 INFO L225 Difference]: With dead ends: 45 [2020-10-23 18:45:07,060 INFO L226 Difference]: Without dead ends: 33 [2020-10-23 18:45:07,061 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2020-10-23 18:45:07,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-10-23 18:45:07,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2020-10-23 18:45:07,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-23 18:45:07,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-10-23 18:45:07,075 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 24 [2020-10-23 18:45:07,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:45:07,076 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-10-23 18:45:07,076 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-23 18:45:07,076 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-10-23 18:45:07,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-10-23 18:45:07,078 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:07,079 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:07,292 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:07,293 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:07,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:07,294 INFO L82 PathProgramCache]: Analyzing trace with hash 892382895, now seen corresponding path program 4 times [2020-10-23 18:45:07,295 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:07,295 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785646433] [2020-10-23 18:45:07,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:07,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:07,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:07,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:07,504 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 18:45:07,504 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785646433] [2020-10-23 18:45:07,505 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832373967] [2020-10-23 18:45:07,505 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:07,561 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-10-23 18:45:07,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:45:07,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 11 conjunts are in the unsatisfiable core [2020-10-23 18:45:07,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:45:07,607 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 18:45:07,607 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:45:07,608 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2020-10-23 18:45:07,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979827906] [2020-10-23 18:45:07,608 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-23 18:45:07,609 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:45:07,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-23 18:45:07,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:45:07,610 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 9 states. [2020-10-23 18:45:07,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:45:07,907 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2020-10-23 18:45:07,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-23 18:45:07,908 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 30 [2020-10-23 18:45:07,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:45:07,908 INFO L225 Difference]: With dead ends: 48 [2020-10-23 18:45:07,909 INFO L226 Difference]: Without dead ends: 36 [2020-10-23 18:45:07,909 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2020-10-23 18:45:07,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-10-23 18:45:07,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-10-23 18:45:07,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-10-23 18:45:07,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions. [2020-10-23 18:45:07,921 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 30 [2020-10-23 18:45:07,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:45:07,922 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 38 transitions. [2020-10-23 18:45:07,922 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-23 18:45:07,922 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions. [2020-10-23 18:45:07,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-23 18:45:07,923 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:07,926 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:08,139 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:08,140 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:08,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:08,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1730626328, now seen corresponding path program 5 times [2020-10-23 18:45:08,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:08,142 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634332479] [2020-10-23 18:45:08,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:08,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:08,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:08,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:08,316 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 40 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 18:45:08,316 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634332479] [2020-10-23 18:45:08,317 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465302939] [2020-10-23 18:45:08,317 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:09,140 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2020-10-23 18:45:09,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:45:09,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 13 conjunts are in the unsatisfiable core [2020-10-23 18:45:09,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:45:09,190 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 40 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 18:45:09,190 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:45:09,190 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2020-10-23 18:45:09,191 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132173839] [2020-10-23 18:45:09,191 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-23 18:45:09,191 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:45:09,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-23 18:45:09,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-10-23 18:45:09,192 INFO L87 Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 10 states. [2020-10-23 18:45:09,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:45:09,614 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2020-10-23 18:45:09,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-23 18:45:09,620 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 33 [2020-10-23 18:45:09,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:45:09,621 INFO L225 Difference]: With dead ends: 51 [2020-10-23 18:45:09,621 INFO L226 Difference]: Without dead ends: 39 [2020-10-23 18:45:09,622 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2020-10-23 18:45:09,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-10-23 18:45:09,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2020-10-23 18:45:09,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-10-23 18:45:09,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2020-10-23 18:45:09,630 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 33 [2020-10-23 18:45:09,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:45:09,630 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2020-10-23 18:45:09,630 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-23 18:45:09,630 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2020-10-23 18:45:09,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-10-23 18:45:09,631 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:09,632 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:09,835 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:09,835 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:09,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:09,836 INFO L82 PathProgramCache]: Analyzing trace with hash -1163405297, now seen corresponding path program 6 times [2020-10-23 18:45:09,836 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:09,837 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461833093] [2020-10-23 18:45:09,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:09,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:10,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:10,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:10,116 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 33 proven. 57 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 18:45:10,116 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461833093] [2020-10-23 18:45:10,117 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [729220504] [2020-10-23 18:45:10,117 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:10,196 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-10-23 18:45:10,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:45:10,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 9 conjunts are in the unsatisfiable core [2020-10-23 18:45:10,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:45:10,295 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-10-23 18:45:10,296 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:45:10,297 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 15 [2020-10-23 18:45:10,298 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134801731] [2020-10-23 18:45:10,299 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-23 18:45:10,299 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:45:10,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-23 18:45:10,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2020-10-23 18:45:10,300 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand 15 states. [2020-10-23 18:45:11,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:45:11,225 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-10-23 18:45:11,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-10-23 18:45:11,227 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 36 [2020-10-23 18:45:11,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:45:11,228 INFO L225 Difference]: With dead ends: 60 [2020-10-23 18:45:11,228 INFO L226 Difference]: Without dead ends: 45 [2020-10-23 18:45:11,230 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=109, Invalid=593, Unknown=0, NotChecked=0, Total=702 [2020-10-23 18:45:11,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-10-23 18:45:11,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2020-10-23 18:45:11,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-10-23 18:45:11,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-10-23 18:45:11,250 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 36 [2020-10-23 18:45:11,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:45:11,251 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-10-23 18:45:11,251 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-23 18:45:11,251 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-10-23 18:45:11,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-10-23 18:45:11,254 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:11,254 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:11,470 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:11,471 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:11,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:11,472 INFO L82 PathProgramCache]: Analyzing trace with hash -50928079, now seen corresponding path program 7 times [2020-10-23 18:45:11,472 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:11,473 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903999373] [2020-10-23 18:45:11,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:11,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:11,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:11,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:11,746 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 61 proven. 77 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-10-23 18:45:11,747 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903999373] [2020-10-23 18:45:11,747 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943112421] [2020-10-23 18:45:11,747 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:11,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:11,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 17 conjunts are in the unsatisfiable core [2020-10-23 18:45:11,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:45:11,852 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 61 proven. 77 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-10-23 18:45:11,853 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:45:11,853 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2020-10-23 18:45:11,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079792407] [2020-10-23 18:45:11,854 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-23 18:45:11,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:45:11,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-23 18:45:11,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-10-23 18:45:11,855 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 12 states. [2020-10-23 18:45:12,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:45:12,406 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2020-10-23 18:45:12,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-23 18:45:12,406 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 42 [2020-10-23 18:45:12,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:45:12,407 INFO L225 Difference]: With dead ends: 63 [2020-10-23 18:45:12,407 INFO L226 Difference]: Without dead ends: 48 [2020-10-23 18:45:12,409 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2020-10-23 18:45:12,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-23 18:45:12,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-10-23 18:45:12,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-10-23 18:45:12,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-10-23 18:45:12,425 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 42 [2020-10-23 18:45:12,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:45:12,427 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-10-23 18:45:12,427 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-23 18:45:12,427 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-10-23 18:45:12,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-10-23 18:45:12,430 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:12,430 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:12,633 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-10-23 18:45:12,634 INFO L429 AbstractCegarLoop]: === Iteration 11 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:12,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:12,635 INFO L82 PathProgramCache]: Analyzing trace with hash 1780901610, now seen corresponding path program 8 times [2020-10-23 18:45:12,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:12,636 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969957450] [2020-10-23 18:45:12,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:12,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:12,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:12,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:12,878 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-10-23 18:45:12,878 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969957450] [2020-10-23 18:45:12,878 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036637489] [2020-10-23 18:45:12,879 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:12,929 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-23 18:45:12,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:45:12,930 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 19 conjunts are in the unsatisfiable core [2020-10-23 18:45:12,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:45:12,976 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-10-23 18:45:12,976 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:45:12,976 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2020-10-23 18:45:12,977 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58549313] [2020-10-23 18:45:12,977 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-23 18:45:12,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:45:12,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-23 18:45:12,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-10-23 18:45:12,978 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 13 states. [2020-10-23 18:45:13,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:45:13,614 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-10-23 18:45:13,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-23 18:45:13,614 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 45 [2020-10-23 18:45:13,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:45:13,615 INFO L225 Difference]: With dead ends: 66 [2020-10-23 18:45:13,616 INFO L226 Difference]: Without dead ends: 51 [2020-10-23 18:45:13,619 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2020-10-23 18:45:13,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-10-23 18:45:13,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2020-10-23 18:45:13,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-10-23 18:45:13,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2020-10-23 18:45:13,636 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 45 [2020-10-23 18:45:13,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:45:13,637 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2020-10-23 18:45:13,637 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-23 18:45:13,637 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2020-10-23 18:45:13,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-10-23 18:45:13,638 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:13,638 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:13,856 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2020-10-23 18:45:13,857 INFO L429 AbstractCegarLoop]: === Iteration 12 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:13,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:13,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1964703633, now seen corresponding path program 9 times [2020-10-23 18:45:13,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:13,858 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [314908230] [2020-10-23 18:45:13,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:13,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:14,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:14,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:14,143 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-10-23 18:45:14,143 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [314908230] [2020-10-23 18:45:14,144 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602371918] [2020-10-23 18:45:14,144 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:14,262 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-10-23 18:45:14,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:45:14,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 11 conjunts are in the unsatisfiable core [2020-10-23 18:45:14,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:45:14,418 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-10-23 18:45:14,419 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:45:14,419 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 19 [2020-10-23 18:45:14,419 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299952317] [2020-10-23 18:45:14,419 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-10-23 18:45:14,420 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:45:14,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-10-23 18:45:14,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=298, Unknown=0, NotChecked=0, Total=342 [2020-10-23 18:45:14,421 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 19 states. [2020-10-23 18:45:15,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:45:15,694 INFO L93 Difference]: Finished difference Result 75 states and 85 transitions. [2020-10-23 18:45:15,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-10-23 18:45:15,695 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2020-10-23 18:45:15,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:45:15,697 INFO L225 Difference]: With dead ends: 75 [2020-10-23 18:45:15,697 INFO L226 Difference]: Without dead ends: 57 [2020-10-23 18:45:15,699 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=148, Invalid=1042, Unknown=0, NotChecked=0, Total=1190 [2020-10-23 18:45:15,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-10-23 18:45:15,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2020-10-23 18:45:15,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-10-23 18:45:15,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2020-10-23 18:45:15,708 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 48 [2020-10-23 18:45:15,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:45:15,708 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2020-10-23 18:45:15,708 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-10-23 18:45:15,708 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2020-10-23 18:45:15,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-10-23 18:45:15,709 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:15,709 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:15,920 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:15,922 INFO L429 AbstractCegarLoop]: === Iteration 13 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:15,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:15,923 INFO L82 PathProgramCache]: Analyzing trace with hash -217393937, now seen corresponding path program 10 times [2020-10-23 18:45:15,924 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:15,924 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112762554] [2020-10-23 18:45:15,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:15,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:16,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:16,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:16,247 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 117 proven. 155 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-10-23 18:45:16,248 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112762554] [2020-10-23 18:45:16,248 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861059180] [2020-10-23 18:45:16,248 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:16,317 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-10-23 18:45:16,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:45:16,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 23 conjunts are in the unsatisfiable core [2020-10-23 18:45:16,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:45:16,382 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 117 proven. 155 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-10-23 18:45:16,383 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:45:16,383 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2020-10-23 18:45:16,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952184277] [2020-10-23 18:45:16,383 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-23 18:45:16,384 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:45:16,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-23 18:45:16,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-10-23 18:45:16,384 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand 15 states. [2020-10-23 18:45:17,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:45:17,248 INFO L93 Difference]: Finished difference Result 78 states and 88 transitions. [2020-10-23 18:45:17,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-10-23 18:45:17,248 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 54 [2020-10-23 18:45:17,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:45:17,251 INFO L225 Difference]: With dead ends: 78 [2020-10-23 18:45:17,251 INFO L226 Difference]: Without dead ends: 60 [2020-10-23 18:45:17,252 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2020-10-23 18:45:17,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-10-23 18:45:17,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-10-23 18:45:17,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-10-23 18:45:17,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 64 transitions. [2020-10-23 18:45:17,261 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 64 transitions. Word has length 54 [2020-10-23 18:45:17,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:45:17,261 INFO L481 AbstractCegarLoop]: Abstraction has 59 states and 64 transitions. [2020-10-23 18:45:17,262 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-23 18:45:17,262 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 64 transitions. [2020-10-23 18:45:17,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-10-23 18:45:17,263 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:45:17,263 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:45:17,471 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:45:17,473 INFO L429 AbstractCegarLoop]: === Iteration 14 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:45:17,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:45:17,474 INFO L82 PathProgramCache]: Analyzing trace with hash -240515032, now seen corresponding path program 11 times [2020-10-23 18:45:17,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:45:17,475 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947334246] [2020-10-23 18:45:17,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:45:17,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:17,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:45:17,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:45:17,790 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-10-23 18:45:17,791 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947334246] [2020-10-23 18:45:17,792 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [124119523] [2020-10-23 18:45:17,792 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true