/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_init2_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-4f750a8 [2020-12-21 21:29:45,205 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-21 21:29:45,209 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-21 21:29:45,265 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-21 21:29:45,265 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-21 21:29:45,270 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-21 21:29:45,274 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-21 21:29:45,282 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-21 21:29:45,285 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-21 21:29:45,292 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-21 21:29:45,293 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-21 21:29:45,295 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-21 21:29:45,295 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-21 21:29:45,299 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-21 21:29:45,301 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-21 21:29:45,317 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-21 21:29:45,318 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-21 21:29:45,321 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-21 21:29:45,329 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-21 21:29:45,338 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-21 21:29:45,340 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-21 21:29:45,342 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-21 21:29:45,343 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-21 21:29:45,346 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-21 21:29:45,355 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-21 21:29:45,361 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-21 21:29:45,362 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-21 21:29:45,364 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-21 21:29:45,365 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-21 21:29:45,366 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-21 21:29:45,367 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-21 21:29:45,367 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-21 21:29:45,368 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-21 21:29:45,368 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-21 21:29:45,369 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-21 21:29:45,370 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-21 21:29:45,376 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-21 21:29:45,410 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-21 21:29:45,410 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-21 21:29:45,412 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-21 21:29:45,412 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-21 21:29:45,413 INFO L138 SettingsManager]: * Use SBE=true [2020-12-21 21:29:45,413 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-21 21:29:45,413 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-21 21:29:45,413 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-21 21:29:45,414 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-21 21:29:45,414 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-21 21:29:45,414 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-21 21:29:45,414 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-21 21:29:45,414 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-21 21:29:45,415 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-21 21:29:45,415 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-21 21:29:45,415 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-21 21:29:45,415 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-21 21:29:45,416 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-21 21:29:45,416 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-21 21:29:45,416 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-21 21:29:45,416 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-21 21:29:45,417 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-21 21:29:45,417 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-21 21:29:45,417 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-21 21:29:45,417 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-21 21:29:45,417 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-21 21:29:45,861 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-21 21:29:45,896 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-21 21:29:45,900 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-21 21:29:45,902 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-21 21:29:45,903 INFO L275 PluginConnector]: CDTParser initialized [2020-12-21 21:29:45,904 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_init2_ground-1.i [2020-12-21 21:29:46,001 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/01b859fe0/5cf6ce0a56a845bd8fddb6d478ba3150/FLAGc8cddf7fe [2020-12-21 21:29:46,682 INFO L306 CDTParser]: Found 1 translation units. [2020-12-21 21:29:46,683 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init2_ground-1.i [2020-12-21 21:29:46,690 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/01b859fe0/5cf6ce0a56a845bd8fddb6d478ba3150/FLAGc8cddf7fe [2020-12-21 21:29:47,050 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/01b859fe0/5cf6ce0a56a845bd8fddb6d478ba3150 [2020-12-21 21:29:47,054 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-21 21:29:47,057 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-21 21:29:47,061 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-21 21:29:47,061 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-21 21:29:47,066 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-21 21:29:47,068 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:29:47" (1/1) ... [2020-12-21 21:29:47,070 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60b86991 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:47, skipping insertion in model container [2020-12-21 21:29:47,070 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.12 09:29:47" (1/1) ... [2020-12-21 21:29:47,081 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-21 21:29:47,098 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-21 21:29:47,242 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init2_ground-1.i[816,829] [2020-12-21 21:29:47,259 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:29:47,269 INFO L203 MainTranslator]: Completed pre-run [2020-12-21 21:29:47,285 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init2_ground-1.i[816,829] [2020-12-21 21:29:47,292 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-21 21:29:47,310 INFO L208 MainTranslator]: Completed translation [2020-12-21 21:29:47,310 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:47 WrapperNode [2020-12-21 21:29:47,311 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-21 21:29:47,312 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-21 21:29:47,312 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-21 21:29:47,313 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-21 21:29:47,322 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:47" (1/1) ... [2020-12-21 21:29:47,331 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:47" (1/1) ... [2020-12-21 21:29:47,354 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-21 21:29:47,355 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-21 21:29:47,355 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-21 21:29:47,355 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-21 21:29:47,365 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:47" (1/1) ... [2020-12-21 21:29:47,365 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:47" (1/1) ... [2020-12-21 21:29:47,367 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:47" (1/1) ... [2020-12-21 21:29:47,367 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:47" (1/1) ... [2020-12-21 21:29:47,375 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:47" (1/1) ... [2020-12-21 21:29:47,386 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:47" (1/1) ... [2020-12-21 21:29:47,391 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:47" (1/1) ... [2020-12-21 21:29:47,395 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-21 21:29:47,397 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-21 21:29:47,397 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-21 21:29:47,397 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-21 21:29:47,401 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:47" (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 [2020-12-21 21:29:47,526 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-21 21:29:47,526 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-21 21:29:47,526 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-21 21:29:47,527 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-21 21:29:47,527 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-21 21:29:47,527 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-21 21:29:47,528 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-21 21:29:47,852 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-21 21:29:47,852 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-21 21:29:47,854 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:29:47 BoogieIcfgContainer [2020-12-21 21:29:47,855 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-21 21:29:47,890 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-21 21:29:47,890 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-21 21:29:47,900 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-21 21:29:47,901 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.12 09:29:47" (1/3) ... [2020-12-21 21:29:47,902 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39d4fbc0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:29:47, skipping insertion in model container [2020-12-21 21:29:47,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.12 09:29:47" (2/3) ... [2020-12-21 21:29:47,902 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39d4fbc0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.12 09:29:47, skipping insertion in model container [2020-12-21 21:29:47,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.12 09:29:47" (3/3) ... [2020-12-21 21:29:47,904 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_init2_ground-1.i [2020-12-21 21:29:47,911 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-21 21:29:47,917 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-21 21:29:47,939 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-21 21:29:48,011 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-21 21:29:48,011 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-21 21:29:48,011 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-21 21:29:48,012 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-21 21:29:48,012 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-21 21:29:48,012 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-21 21:29:48,012 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-21 21:29:48,012 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-21 21:29:48,035 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-12-21 21:29:48,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-21 21:29:48,044 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:48,045 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:48,045 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:48,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:48,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1157636873, now seen corresponding path program 1 times [2020-12-21 21:29:48,066 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:48,067 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092579271] [2020-12-21 21:29:48,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:48,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:48,350 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-21 21:29:48,351 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092579271] [2020-12-21 21:29:48,353 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-21 21:29:48,353 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-21 21:29:48,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427561939] [2020-12-21 21:29:48,360 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-21 21:29:48,360 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:48,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-21 21:29:48,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:29:48,387 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 3 states. [2020-12-21 21:29:48,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:48,478 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2020-12-21 21:29:48,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-21 21:29:48,480 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-21 21:29:48,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:48,501 INFO L225 Difference]: With dead ends: 31 [2020-12-21 21:29:48,504 INFO L226 Difference]: Without dead ends: 14 [2020-12-21 21:29:48,512 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-21 21:29:48,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-21 21:29:48,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-12-21 21:29:48,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-21 21:29:48,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-12-21 21:29:48,546 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 9 [2020-12-21 21:29:48,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:48,547 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-12-21 21:29:48,547 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-21 21:29:48,547 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-12-21 21:29:48,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-21 21:29:48,548 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:48,548 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:48,548 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-21 21:29:48,549 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:48,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:48,550 INFO L82 PathProgramCache]: Analyzing trace with hash 970257334, now seen corresponding path program 1 times [2020-12-21 21:29:48,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:48,550 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484086187] [2020-12-21 21:29:48,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:48,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:48,604 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:29:48,605 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484086187] [2020-12-21 21:29:48,605 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1814826251] [2020-12-21 21:29:48,605 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 [2020-12-21 21:29:48,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:48,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-21 21:29:48,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:48,750 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-21 21:29:48,751 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:48,751 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-21 21:29:48,752 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822104316] [2020-12-21 21:29:48,753 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-21 21:29:48,753 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:48,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-21 21:29:48,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:29:48,755 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 5 states. [2020-12-21 21:29:48,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:48,785 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-12-21 21:29:48,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-21 21:29:48,786 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-12-21 21:29:48,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:48,787 INFO L225 Difference]: With dead ends: 26 [2020-12-21 21:29:48,787 INFO L226 Difference]: Without dead ends: 16 [2020-12-21 21:29:48,788 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-21 21:29:48,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-21 21:29:48,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-12-21 21:29:48,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-21 21:29:48,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-12-21 21:29:48,793 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2020-12-21 21:29:48,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:48,794 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-12-21 21:29:48,794 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-21 21:29:48,794 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-12-21 21:29:48,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-21 21:29:48,795 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:48,795 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:49,009 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-21 21:29:49,010 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:49,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:49,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1117998999, now seen corresponding path program 2 times [2020-12-21 21:29:49,012 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:49,012 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631515676] [2020-12-21 21:29:49,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:49,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:49,083 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-21 21:29:49,084 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631515676] [2020-12-21 21:29:49,084 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [922827763] [2020-12-21 21:29:49,084 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 [2020-12-21 21:29:49,160 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:29:49,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:49,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-21 21:29:49,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:49,235 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-21 21:29:49,235 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:49,236 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-21 21:29:49,236 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449682692] [2020-12-21 21:29:49,237 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-21 21:29:49,237 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:49,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-21 21:29:49,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:29:49,242 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-12-21 21:29:49,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:49,307 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-12-21 21:29:49,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-21 21:29:49,309 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-12-21 21:29:49,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:49,311 INFO L225 Difference]: With dead ends: 29 [2020-12-21 21:29:49,311 INFO L226 Difference]: Without dead ends: 18 [2020-12-21 21:29:49,313 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-21 21:29:49,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-21 21:29:49,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-12-21 21:29:49,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-21 21:29:49,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-12-21 21:29:49,326 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-12-21 21:29:49,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:49,326 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-12-21 21:29:49,326 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-21 21:29:49,326 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-12-21 21:29:49,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-21 21:29:49,329 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:49,329 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:49,543 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:49,544 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:49,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:49,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1025156458, now seen corresponding path program 3 times [2020-12-21 21:29:49,546 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:49,547 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [591627815] [2020-12-21 21:29:49,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:49,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:49,615 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-21 21:29:49,616 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [591627815] [2020-12-21 21:29:49,616 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380206885] [2020-12-21 21:29:49,616 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 [2020-12-21 21:29:49,676 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-21 21:29:49,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:49,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-21 21:29:49,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:49,719 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-21 21:29:49,719 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:49,719 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-21 21:29:49,720 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903434681] [2020-12-21 21:29:49,720 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-21 21:29:49,721 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:49,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-21 21:29:49,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:29:49,722 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-12-21 21:29:49,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:49,763 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2020-12-21 21:29:49,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-21 21:29:49,763 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-12-21 21:29:49,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:49,764 INFO L225 Difference]: With dead ends: 32 [2020-12-21 21:29:49,765 INFO L226 Difference]: Without dead ends: 20 [2020-12-21 21:29:49,765 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-21 21:29:49,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-21 21:29:49,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-21 21:29:49,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-21 21:29:49,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-12-21 21:29:49,770 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2020-12-21 21:29:49,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:49,771 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-12-21 21:29:49,771 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-21 21:29:49,771 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-12-21 21:29:49,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-21 21:29:49,772 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:49,772 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:49,987 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:49,988 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:49,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:49,990 INFO L82 PathProgramCache]: Analyzing trace with hash -57021897, now seen corresponding path program 4 times [2020-12-21 21:29:49,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:49,992 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313712434] [2020-12-21 21:29:49,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:50,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:50,126 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-21 21:29:50,127 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313712434] [2020-12-21 21:29:50,127 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [652201969] [2020-12-21 21:29:50,127 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 [2020-12-21 21:29:50,202 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:29:50,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:50,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-21 21:29:50,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:50,246 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-21 21:29:50,246 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:50,246 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-21 21:29:50,247 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75707788] [2020-12-21 21:29:50,247 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-21 21:29:50,247 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:50,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-21 21:29:50,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:29:50,249 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 8 states. [2020-12-21 21:29:50,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:50,286 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2020-12-21 21:29:50,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-21 21:29:50,287 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2020-12-21 21:29:50,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:50,287 INFO L225 Difference]: With dead ends: 35 [2020-12-21 21:29:50,288 INFO L226 Difference]: Without dead ends: 22 [2020-12-21 21:29:50,288 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-21 21:29:50,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-21 21:29:50,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-12-21 21:29:50,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-21 21:29:50,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-12-21 21:29:50,293 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2020-12-21 21:29:50,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:50,294 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-12-21 21:29:50,294 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-21 21:29:50,294 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-12-21 21:29:50,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-21 21:29:50,295 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:50,295 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:50,509 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:50,510 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:50,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:50,511 INFO L82 PathProgramCache]: Analyzing trace with hash 315152758, now seen corresponding path program 5 times [2020-12-21 21:29:50,512 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:50,512 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918692719] [2020-12-21 21:29:50,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:50,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:50,643 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-21 21:29:50,643 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918692719] [2020-12-21 21:29:50,644 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [426271260] [2020-12-21 21:29:50,644 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 [2020-12-21 21:29:50,831 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-21 21:29:50,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:50,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-21 21:29:50,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:50,878 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-21 21:29:50,879 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:50,879 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-21 21:29:50,879 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21893011] [2020-12-21 21:29:50,879 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-21 21:29:50,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:50,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-21 21:29:50,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:29:50,881 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 9 states. [2020-12-21 21:29:50,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:50,931 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-12-21 21:29:50,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-21 21:29:50,932 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-12-21 21:29:50,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:50,933 INFO L225 Difference]: With dead ends: 38 [2020-12-21 21:29:50,933 INFO L226 Difference]: Without dead ends: 24 [2020-12-21 21:29:50,934 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-21 21:29:50,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-21 21:29:50,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-12-21 21:29:50,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-21 21:29:50,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-12-21 21:29:50,938 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 19 [2020-12-21 21:29:50,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:50,939 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-12-21 21:29:50,939 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-21 21:29:50,939 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-12-21 21:29:50,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-21 21:29:50,940 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:50,940 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:51,154 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-21 21:29:51,155 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:51,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:51,156 INFO L82 PathProgramCache]: Analyzing trace with hash -846091049, now seen corresponding path program 6 times [2020-12-21 21:29:51,156 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:51,157 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973793927] [2020-12-21 21:29:51,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:51,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:51,271 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-21 21:29:51,272 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973793927] [2020-12-21 21:29:51,272 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698560292] [2020-12-21 21:29:51,272 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 [2020-12-21 21:29:51,353 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2020-12-21 21:29:51,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:51,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-21 21:29:51,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:51,404 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-21 21:29:51,405 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:51,405 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-21 21:29:51,405 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181506956] [2020-12-21 21:29:51,406 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-21 21:29:51,406 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:51,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-21 21:29:51,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:29:51,407 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 10 states. [2020-12-21 21:29:51,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:51,450 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2020-12-21 21:29:51,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-21 21:29:51,451 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2020-12-21 21:29:51,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:51,452 INFO L225 Difference]: With dead ends: 41 [2020-12-21 21:29:51,452 INFO L226 Difference]: Without dead ends: 26 [2020-12-21 21:29:51,453 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-21 21:29:51,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-21 21:29:51,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-12-21 21:29:51,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-21 21:29:51,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-12-21 21:29:51,457 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2020-12-21 21:29:51,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:51,458 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-12-21 21:29:51,458 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-21 21:29:51,458 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-12-21 21:29:51,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-21 21:29:51,459 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:51,459 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:51,673 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:51,674 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:51,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:51,675 INFO L82 PathProgramCache]: Analyzing trace with hash 401698902, now seen corresponding path program 7 times [2020-12-21 21:29:51,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:51,676 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345345132] [2020-12-21 21:29:51,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:51,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:51,834 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-21 21:29:51,835 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345345132] [2020-12-21 21:29:51,835 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1846087439] [2020-12-21 21:29:51,835 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 [2020-12-21 21:29:51,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:51,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-21 21:29:51,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:51,965 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-21 21:29:51,965 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:51,966 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-21 21:29:51,966 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626837564] [2020-12-21 21:29:51,966 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-21 21:29:51,967 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:51,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-21 21:29:51,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:29:51,968 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 11 states. [2020-12-21 21:29:52,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:52,015 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-12-21 21:29:52,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-21 21:29:52,016 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2020-12-21 21:29:52,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:52,017 INFO L225 Difference]: With dead ends: 44 [2020-12-21 21:29:52,017 INFO L226 Difference]: Without dead ends: 28 [2020-12-21 21:29:52,017 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-21 21:29:52,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-21 21:29:52,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-12-21 21:29:52,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-21 21:29:52,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-12-21 21:29:52,023 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2020-12-21 21:29:52,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:52,023 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-12-21 21:29:52,024 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-21 21:29:52,024 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-12-21 21:29:52,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-21 21:29:52,025 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:52,025 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:52,233 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:52,234 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:52,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:52,235 INFO L82 PathProgramCache]: Analyzing trace with hash -88565897, now seen corresponding path program 8 times [2020-12-21 21:29:52,236 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:52,237 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603406651] [2020-12-21 21:29:52,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:52,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:52,404 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:29:52,404 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603406651] [2020-12-21 21:29:52,404 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [475893247] [2020-12-21 21:29:52,405 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 [2020-12-21 21:29:52,464 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:29:52,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:52,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-21 21:29:52,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:52,544 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-21 21:29:52,545 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:52,545 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-21 21:29:52,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884460986] [2020-12-21 21:29:52,546 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-21 21:29:52,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:52,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-21 21:29:52,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:29:52,547 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 12 states. [2020-12-21 21:29:52,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:52,616 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2020-12-21 21:29:52,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-21 21:29:52,617 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2020-12-21 21:29:52,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:52,617 INFO L225 Difference]: With dead ends: 47 [2020-12-21 21:29:52,617 INFO L226 Difference]: Without dead ends: 30 [2020-12-21 21:29:52,618 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-21 21:29:52,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-21 21:29:52,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-12-21 21:29:52,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-21 21:29:52,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-12-21 21:29:52,626 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2020-12-21 21:29:52,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:52,626 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-12-21 21:29:52,626 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-21 21:29:52,626 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-12-21 21:29:52,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-21 21:29:52,627 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:52,627 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:52,836 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-21 21:29:52,839 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:52,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:52,839 INFO L82 PathProgramCache]: Analyzing trace with hash -1068425418, now seen corresponding path program 9 times [2020-12-21 21:29:52,840 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:52,840 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034150192] [2020-12-21 21:29:52,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:52,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:52,983 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-21 21:29:52,983 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034150192] [2020-12-21 21:29:52,984 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1681213155] [2020-12-21 21:29:52,984 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 [2020-12-21 21:29:53,201 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-21 21:29:53,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:53,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-21 21:29:53,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:53,273 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-21 21:29:53,273 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:53,273 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-21 21:29:53,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260395563] [2020-12-21 21:29:53,274 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-21 21:29:53,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:53,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-21 21:29:53,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:29:53,275 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 13 states. [2020-12-21 21:29:53,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:53,326 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-12-21 21:29:53,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-21 21:29:53,326 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2020-12-21 21:29:53,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:53,327 INFO L225 Difference]: With dead ends: 50 [2020-12-21 21:29:53,327 INFO L226 Difference]: Without dead ends: 32 [2020-12-21 21:29:53,328 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-21 21:29:53,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-21 21:29:53,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-12-21 21:29:53,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-21 21:29:53,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-12-21 21:29:53,333 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 27 [2020-12-21 21:29:53,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:53,334 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-12-21 21:29:53,334 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-21 21:29:53,334 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-12-21 21:29:53,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-21 21:29:53,335 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:53,335 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:53,549 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:53,550 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:53,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:53,551 INFO L82 PathProgramCache]: Analyzing trace with hash 163359255, now seen corresponding path program 10 times [2020-12-21 21:29:53,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:53,551 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947565612] [2020-12-21 21:29:53,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:53,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:53,715 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-21 21:29:53,715 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947565612] [2020-12-21 21:29:53,715 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2092379696] [2020-12-21 21:29:53,715 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 [2020-12-21 21:29:53,787 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:29:53,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:53,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-21 21:29:53,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:53,873 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-21 21:29:53,873 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:53,874 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-21 21:29:53,874 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37387194] [2020-12-21 21:29:53,874 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-21 21:29:53,874 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:53,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-21 21:29:53,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:29:53,876 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 14 states. [2020-12-21 21:29:53,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:53,934 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2020-12-21 21:29:53,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-21 21:29:53,935 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2020-12-21 21:29:53,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:53,936 INFO L225 Difference]: With dead ends: 53 [2020-12-21 21:29:53,936 INFO L226 Difference]: Without dead ends: 34 [2020-12-21 21:29:53,936 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-21 21:29:53,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-21 21:29:53,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-12-21 21:29:53,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-21 21:29:53,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-12-21 21:29:53,942 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 29 [2020-12-21 21:29:53,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:53,942 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-12-21 21:29:53,942 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-21 21:29:53,942 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-12-21 21:29:53,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-21 21:29:53,943 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:53,943 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:54,159 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:54,160 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:54,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:54,161 INFO L82 PathProgramCache]: Analyzing trace with hash 425322006, now seen corresponding path program 11 times [2020-12-21 21:29:54,162 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:54,162 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1386628264] [2020-12-21 21:29:54,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:54,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:54,309 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-12-21 21:29:54,309 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1386628264] [2020-12-21 21:29:54,309 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786558602] [2020-12-21 21:29:54,310 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 [2020-12-21 21:29:54,744 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2020-12-21 21:29:54,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:54,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-21 21:29:54,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:54,831 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-12-21 21:29:54,832 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:54,832 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-21 21:29:54,832 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050661404] [2020-12-21 21:29:54,833 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-21 21:29:54,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:54,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-21 21:29:54,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:29:54,834 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 15 states. [2020-12-21 21:29:54,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:54,902 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2020-12-21 21:29:54,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-21 21:29:54,903 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2020-12-21 21:29:54,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:54,904 INFO L225 Difference]: With dead ends: 56 [2020-12-21 21:29:54,904 INFO L226 Difference]: Without dead ends: 36 [2020-12-21 21:29:54,905 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-21 21:29:54,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-21 21:29:54,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-12-21 21:29:54,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-21 21:29:54,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-12-21 21:29:54,911 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2020-12-21 21:29:54,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:54,911 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-12-21 21:29:54,911 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-21 21:29:54,911 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-12-21 21:29:54,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-21 21:29:54,912 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:54,912 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:55,123 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-21 21:29:55,124 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:55,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:55,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1597250377, now seen corresponding path program 12 times [2020-12-21 21:29:55,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:55,126 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345184557] [2020-12-21 21:29:55,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:55,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:55,308 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-21 21:29:55,308 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345184557] [2020-12-21 21:29:55,308 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [82994123] [2020-12-21 21:29:55,308 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:55,796 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-21 21:29:55,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:55,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-21 21:29:55,805 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:55,862 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-21 21:29:55,863 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:55,863 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-21 21:29:55,863 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052500989] [2020-12-21 21:29:55,864 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-21 21:29:55,864 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:55,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-21 21:29:55,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:29:55,865 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 16 states. [2020-12-21 21:29:55,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:55,915 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2020-12-21 21:29:55,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-21 21:29:55,915 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2020-12-21 21:29:55,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:55,916 INFO L225 Difference]: With dead ends: 59 [2020-12-21 21:29:55,916 INFO L226 Difference]: Without dead ends: 38 [2020-12-21 21:29:55,917 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-21 21:29:55,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-21 21:29:55,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-12-21 21:29:55,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-21 21:29:55,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-12-21 21:29:55,922 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 33 [2020-12-21 21:29:55,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:55,922 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-12-21 21:29:55,922 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-21 21:29:55,922 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-12-21 21:29:55,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-12-21 21:29:55,923 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:55,923 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:56,136 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-21 21:29:56,137 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:56,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:56,138 INFO L82 PathProgramCache]: Analyzing trace with hash 1878902006, now seen corresponding path program 13 times [2020-12-21 21:29:56,138 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:56,139 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169913129] [2020-12-21 21:29:56,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:56,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:56,314 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-12-21 21:29:56,314 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169913129] [2020-12-21 21:29:56,314 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304108694] [2020-12-21 21:29:56,315 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:56,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:56,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-21 21:29:56,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:56,432 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-12-21 21:29:56,432 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:56,432 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-21 21:29:56,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114506291] [2020-12-21 21:29:56,433 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-21 21:29:56,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:56,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-21 21:29:56,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:29:56,434 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 17 states. [2020-12-21 21:29:56,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:56,501 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-12-21 21:29:56,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-21 21:29:56,501 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2020-12-21 21:29:56,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:56,502 INFO L225 Difference]: With dead ends: 62 [2020-12-21 21:29:56,502 INFO L226 Difference]: Without dead ends: 40 [2020-12-21 21:29:56,503 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-21 21:29:56,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-12-21 21:29:56,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-12-21 21:29:56,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-21 21:29:56,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-12-21 21:29:56,509 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 35 [2020-12-21 21:29:56,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:56,509 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-12-21 21:29:56,509 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-21 21:29:56,509 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-12-21 21:29:56,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-21 21:29:56,510 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:56,510 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:56,723 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-21 21:29:56,724 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:56,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:56,724 INFO L82 PathProgramCache]: Analyzing trace with hash 1720993623, now seen corresponding path program 14 times [2020-12-21 21:29:56,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:56,725 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885984788] [2020-12-21 21:29:56,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:56,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:56,928 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-12-21 21:29:56,929 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885984788] [2020-12-21 21:29:56,929 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2659231] [2020-12-21 21:29:56,929 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:56,996 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:29:56,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:56,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-21 21:29:56,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:57,068 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-12-21 21:29:57,068 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:57,068 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-21 21:29:57,068 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698658496] [2020-12-21 21:29:57,069 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-21 21:29:57,069 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:57,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-21 21:29:57,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:29:57,072 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 18 states. [2020-12-21 21:29:57,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:57,146 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2020-12-21 21:29:57,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-21 21:29:57,147 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 37 [2020-12-21 21:29:57,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:57,148 INFO L225 Difference]: With dead ends: 65 [2020-12-21 21:29:57,148 INFO L226 Difference]: Without dead ends: 42 [2020-12-21 21:29:57,149 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-21 21:29:57,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-21 21:29:57,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-12-21 21:29:57,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-12-21 21:29:57,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-12-21 21:29:57,154 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 37 [2020-12-21 21:29:57,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:57,154 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-12-21 21:29:57,154 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-21 21:29:57,155 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-12-21 21:29:57,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-21 21:29:57,155 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:57,155 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:57,370 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:57,371 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:57,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:57,372 INFO L82 PathProgramCache]: Analyzing trace with hash 1890499542, now seen corresponding path program 15 times [2020-12-21 21:29:57,372 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:57,372 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073065337] [2020-12-21 21:29:57,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:57,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:57,565 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-21 21:29:57,566 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073065337] [2020-12-21 21:29:57,566 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [520903936] [2020-12-21 21:29:57,566 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:58,346 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-21 21:29:58,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:58,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-21 21:29:58,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:58,447 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-21 21:29:58,447 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:58,447 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-21 21:29:58,447 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227159356] [2020-12-21 21:29:58,448 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-21 21:29:58,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:58,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-21 21:29:58,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:29:58,449 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 19 states. [2020-12-21 21:29:58,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:58,520 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2020-12-21 21:29:58,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-21 21:29:58,521 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2020-12-21 21:29:58,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:58,521 INFO L225 Difference]: With dead ends: 68 [2020-12-21 21:29:58,521 INFO L226 Difference]: Without dead ends: 44 [2020-12-21 21:29:58,522 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-21 21:29:58,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-12-21 21:29:58,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-12-21 21:29:58,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-21 21:29:58,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-12-21 21:29:58,529 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 39 [2020-12-21 21:29:58,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:58,530 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-12-21 21:29:58,530 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-21 21:29:58,530 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-12-21 21:29:58,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-21 21:29:58,530 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:58,531 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:58,733 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-21 21:29:58,734 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:58,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:58,735 INFO L82 PathProgramCache]: Analyzing trace with hash -498871817, now seen corresponding path program 16 times [2020-12-21 21:29:58,735 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:58,736 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235125329] [2020-12-21 21:29:58,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:58,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:58,965 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2020-12-21 21:29:58,965 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235125329] [2020-12-21 21:29:58,966 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [767022180] [2020-12-21 21:29:58,966 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:29:59,042 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:29:59,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:29:59,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-21 21:29:59,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:29:59,113 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2020-12-21 21:29:59,114 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:29:59,114 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-21 21:29:59,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078655611] [2020-12-21 21:29:59,115 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-21 21:29:59,115 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:29:59,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-21 21:29:59,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:29:59,116 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 20 states. [2020-12-21 21:29:59,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:29:59,206 INFO L93 Difference]: Finished difference Result 71 states and 76 transitions. [2020-12-21 21:29:59,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-21 21:29:59,207 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 41 [2020-12-21 21:29:59,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:29:59,207 INFO L225 Difference]: With dead ends: 71 [2020-12-21 21:29:59,207 INFO L226 Difference]: Without dead ends: 46 [2020-12-21 21:29:59,208 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-21 21:29:59,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-21 21:29:59,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-12-21 21:29:59,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-12-21 21:29:59,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-12-21 21:29:59,213 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 41 [2020-12-21 21:29:59,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:29:59,213 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-12-21 21:29:59,213 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-21 21:29:59,213 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-12-21 21:29:59,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-12-21 21:29:59,214 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:29:59,214 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:29:59,428 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-21 21:29:59,429 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:29:59,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:29:59,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1197394614, now seen corresponding path program 17 times [2020-12-21 21:29:59,430 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:29:59,430 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705657602] [2020-12-21 21:29:59,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:29:59,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:29:59,727 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-12-21 21:29:59,728 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705657602] [2020-12-21 21:29:59,728 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [657019355] [2020-12-21 21:29:59,728 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:07,225 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2020-12-21 21:30:07,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:07,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-21 21:30:07,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:07,341 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-12-21 21:30:07,342 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:07,342 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-21 21:30:07,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477938016] [2020-12-21 21:30:07,343 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-21 21:30:07,343 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:07,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-21 21:30:07,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:30:07,345 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 21 states. [2020-12-21 21:30:07,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:07,424 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-12-21 21:30:07,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-21 21:30:07,425 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-12-21 21:30:07,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:07,426 INFO L225 Difference]: With dead ends: 74 [2020-12-21 21:30:07,426 INFO L226 Difference]: Without dead ends: 48 [2020-12-21 21:30:07,426 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-21 21:30:07,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-21 21:30:07,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-12-21 21:30:07,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-21 21:30:07,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-12-21 21:30:07,432 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 43 [2020-12-21 21:30:07,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:07,433 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-12-21 21:30:07,433 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-21 21:30:07,433 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-12-21 21:30:07,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-21 21:30:07,434 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:07,434 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:07,648 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-21 21:30:07,649 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:07,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:07,651 INFO L82 PathProgramCache]: Analyzing trace with hash 1535673495, now seen corresponding path program 18 times [2020-12-21 21:30:07,652 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:07,652 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061159418] [2020-12-21 21:30:07,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:07,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:07,948 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-21 21:30:07,949 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061159418] [2020-12-21 21:30:07,950 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311264494] [2020-12-21 21:30:07,950 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:11,482 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2020-12-21 21:30:11,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:11,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-21 21:30:11,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:11,581 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-21 21:30:11,581 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:11,581 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-12-21 21:30:11,582 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180233300] [2020-12-21 21:30:11,583 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-21 21:30:11,583 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:11,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-21 21:30:11,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-21 21:30:11,585 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 22 states. [2020-12-21 21:30:11,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:11,643 INFO L93 Difference]: Finished difference Result 77 states and 82 transitions. [2020-12-21 21:30:11,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-21 21:30:11,644 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 45 [2020-12-21 21:30:11,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:11,644 INFO L225 Difference]: With dead ends: 77 [2020-12-21 21:30:11,644 INFO L226 Difference]: Without dead ends: 50 [2020-12-21 21:30:11,645 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-21 21:30:11,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-12-21 21:30:11,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-12-21 21:30:11,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-12-21 21:30:11,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-12-21 21:30:11,650 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 45 [2020-12-21 21:30:11,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:11,650 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-12-21 21:30:11,650 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-21 21:30:11,650 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-12-21 21:30:11,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-21 21:30:11,652 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:11,652 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:11,866 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:11,867 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:11,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:11,868 INFO L82 PathProgramCache]: Analyzing trace with hash -1082134122, now seen corresponding path program 19 times [2020-12-21 21:30:11,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:11,868 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1964307952] [2020-12-21 21:30:11,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:11,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:12,155 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-12-21 21:30:12,157 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1964307952] [2020-12-21 21:30:12,158 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1163676826] [2020-12-21 21:30:12,158 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:12,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:12,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-21 21:30:12,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:12,298 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-12-21 21:30:12,298 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:12,298 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2020-12-21 21:30:12,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1190617685] [2020-12-21 21:30:12,300 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-21 21:30:12,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:12,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-21 21:30:12,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-21 21:30:12,302 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 23 states. [2020-12-21 21:30:12,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:12,390 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2020-12-21 21:30:12,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-21 21:30:12,390 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 47 [2020-12-21 21:30:12,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:12,391 INFO L225 Difference]: With dead ends: 80 [2020-12-21 21:30:12,391 INFO L226 Difference]: Without dead ends: 52 [2020-12-21 21:30:12,392 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-21 21:30:12,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-12-21 21:30:12,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-12-21 21:30:12,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-21 21:30:12,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-12-21 21:30:12,397 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 47 [2020-12-21 21:30:12,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:12,397 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-12-21 21:30:12,397 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-21 21:30:12,398 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-12-21 21:30:12,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-21 21:30:12,398 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:12,398 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:12,612 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:12,613 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:12,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:12,614 INFO L82 PathProgramCache]: Analyzing trace with hash -1164943561, now seen corresponding path program 20 times [2020-12-21 21:30:12,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:12,614 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1266762089] [2020-12-21 21:30:12,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:12,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:12,974 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-12-21 21:30:12,974 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1266762089] [2020-12-21 21:30:12,974 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1187594857] [2020-12-21 21:30:12,975 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:13,045 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:30:13,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:13,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-21 21:30:13,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:13,118 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-12-21 21:30:13,118 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:13,119 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-12-21 21:30:13,119 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105105710] [2020-12-21 21:30:13,119 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-21 21:30:13,120 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:13,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-21 21:30:13,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:30:13,121 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 24 states. [2020-12-21 21:30:13,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:13,212 INFO L93 Difference]: Finished difference Result 83 states and 88 transitions. [2020-12-21 21:30:13,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-21 21:30:13,213 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 49 [2020-12-21 21:30:13,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:13,214 INFO L225 Difference]: With dead ends: 83 [2020-12-21 21:30:13,214 INFO L226 Difference]: Without dead ends: 54 [2020-12-21 21:30:13,215 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-21 21:30:13,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-12-21 21:30:13,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-12-21 21:30:13,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-12-21 21:30:13,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-12-21 21:30:13,219 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 49 [2020-12-21 21:30:13,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:13,220 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-12-21 21:30:13,220 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-21 21:30:13,220 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-12-21 21:30:13,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-12-21 21:30:13,220 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:13,221 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:13,433 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2020-12-21 21:30:13,434 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:13,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:13,435 INFO L82 PathProgramCache]: Analyzing trace with hash 1677996150, now seen corresponding path program 21 times [2020-12-21 21:30:13,435 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:13,435 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950514320] [2020-12-21 21:30:13,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:13,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:13,801 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-12-21 21:30:13,802 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950514320] [2020-12-21 21:30:13,802 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026246325] [2020-12-21 21:30:13,802 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:25,440 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2020-12-21 21:30:25,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:25,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 23 conjunts are in the unsatisfiable core [2020-12-21 21:30:25,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:25,537 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-12-21 21:30:25,539 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:25,539 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2020-12-21 21:30:25,540 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388514795] [2020-12-21 21:30:25,540 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-21 21:30:25,540 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:25,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-21 21:30:25,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2020-12-21 21:30:25,542 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 25 states. [2020-12-21 21:30:25,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:25,635 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-12-21 21:30:25,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-21 21:30:25,635 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 51 [2020-12-21 21:30:25,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:25,636 INFO L225 Difference]: With dead ends: 86 [2020-12-21 21:30:25,636 INFO L226 Difference]: Without dead ends: 56 [2020-12-21 21:30:25,637 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2020-12-21 21:30:25,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-21 21:30:25,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-12-21 21:30:25,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-21 21:30:25,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-12-21 21:30:25,641 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2020-12-21 21:30:25,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:25,642 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-12-21 21:30:25,642 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-21 21:30:25,642 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-12-21 21:30:25,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-21 21:30:25,643 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:25,643 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:25,856 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-21 21:30:25,857 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:25,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:25,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1745445335, now seen corresponding path program 22 times [2020-12-21 21:30:25,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:25,859 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618271031] [2020-12-21 21:30:25,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:25,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:26,253 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2020-12-21 21:30:26,254 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618271031] [2020-12-21 21:30:26,254 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388181519] [2020-12-21 21:30:26,254 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:26,326 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:30:26,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:30:26,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 24 conjunts are in the unsatisfiable core [2020-12-21 21:30:26,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:30:26,400 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2020-12-21 21:30:26,400 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:30:26,400 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-12-21 21:30:26,401 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817294344] [2020-12-21 21:30:26,401 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-21 21:30:26,401 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:30:26,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-21 21:30:26,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-21 21:30:26,402 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 26 states. [2020-12-21 21:30:26,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:30:26,490 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2020-12-21 21:30:26,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-21 21:30:26,491 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 53 [2020-12-21 21:30:26,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:30:26,491 INFO L225 Difference]: With dead ends: 89 [2020-12-21 21:30:26,491 INFO L226 Difference]: Without dead ends: 58 [2020-12-21 21:30:26,492 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-21 21:30:26,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-12-21 21:30:26,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-12-21 21:30:26,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-12-21 21:30:26,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-12-21 21:30:26,496 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 53 [2020-12-21 21:30:26,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:30:26,496 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-12-21 21:30:26,497 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-21 21:30:26,497 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-12-21 21:30:26,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-12-21 21:30:26,497 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:30:26,497 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:30:26,711 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:30:26,712 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:30:26,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:30:26,712 INFO L82 PathProgramCache]: Analyzing trace with hash -1621260458, now seen corresponding path program 23 times [2020-12-21 21:30:26,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:30:26,713 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453953245] [2020-12-21 21:30:26,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:30:26,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:30:27,159 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2020-12-21 21:30:27,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453953245] [2020-12-21 21:30:27,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79880825] [2020-12-21 21:30:27,160 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:32:01,067 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2020-12-21 21:32:01,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:32:01,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 25 conjunts are in the unsatisfiable core [2020-12-21 21:32:01,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:32:01,267 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2020-12-21 21:32:01,268 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:32:01,268 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2020-12-21 21:32:01,268 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1738932230] [2020-12-21 21:32:01,269 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-21 21:32:01,269 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:32:01,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-21 21:32:01,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2020-12-21 21:32:01,270 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 27 states. [2020-12-21 21:32:01,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:32:01,368 INFO L93 Difference]: Finished difference Result 92 states and 97 transitions. [2020-12-21 21:32:01,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-12-21 21:32:01,369 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 55 [2020-12-21 21:32:01,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:32:01,369 INFO L225 Difference]: With dead ends: 92 [2020-12-21 21:32:01,369 INFO L226 Difference]: Without dead ends: 60 [2020-12-21 21:32:01,370 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2020-12-21 21:32:01,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-21 21:32:01,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-12-21 21:32:01,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-12-21 21:32:01,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-12-21 21:32:01,374 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 55 [2020-12-21 21:32:01,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:32:01,374 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-12-21 21:32:01,374 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-21 21:32:01,374 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-12-21 21:32:01,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-21 21:32:01,375 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:32:01,375 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:32:01,589 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2020-12-21 21:32:01,590 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:32:01,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:32:01,590 INFO L82 PathProgramCache]: Analyzing trace with hash 757173367, now seen corresponding path program 24 times [2020-12-21 21:32:01,591 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:32:01,591 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950155903] [2020-12-21 21:32:01,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:32:01,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:32:02,011 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2020-12-21 21:32:02,012 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950155903] [2020-12-21 21:32:02,012 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235030445] [2020-12-21 21:32:02,012 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:32:13,607 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-21 21:32:13,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:32:13,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 26 conjunts are in the unsatisfiable core [2020-12-21 21:32:13,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:32:13,708 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2020-12-21 21:32:13,712 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:32:13,712 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-12-21 21:32:13,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053156168] [2020-12-21 21:32:13,713 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-12-21 21:32:13,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:32:13,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-12-21 21:32:13,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2020-12-21 21:32:13,714 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 28 states. [2020-12-21 21:32:13,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:32:13,816 INFO L93 Difference]: Finished difference Result 95 states and 100 transitions. [2020-12-21 21:32:13,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-12-21 21:32:13,817 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 57 [2020-12-21 21:32:13,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:32:13,818 INFO L225 Difference]: With dead ends: 95 [2020-12-21 21:32:13,818 INFO L226 Difference]: Without dead ends: 62 [2020-12-21 21:32:13,819 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2020-12-21 21:32:13,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-12-21 21:32:13,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2020-12-21 21:32:13,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-12-21 21:32:13,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-12-21 21:32:13,833 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 57 [2020-12-21 21:32:13,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:32:13,833 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-12-21 21:32:13,834 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-12-21 21:32:13,834 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-12-21 21:32:13,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-12-21 21:32:13,834 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:32:13,834 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:32:14,048 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:32:14,049 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:32:14,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:32:14,049 INFO L82 PathProgramCache]: Analyzing trace with hash -612501962, now seen corresponding path program 25 times [2020-12-21 21:32:14,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:32:14,050 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548035941] [2020-12-21 21:32:14,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:32:14,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:32:14,505 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-12-21 21:32:14,506 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548035941] [2020-12-21 21:32:14,506 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333578341] [2020-12-21 21:32:14,506 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:32:14,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:32:14,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 27 conjunts are in the unsatisfiable core [2020-12-21 21:32:14,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:32:14,659 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-12-21 21:32:14,659 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:32:14,659 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 29 [2020-12-21 21:32:14,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468304938] [2020-12-21 21:32:14,660 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-12-21 21:32:14,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:32:14,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-12-21 21:32:14,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2020-12-21 21:32:14,661 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 29 states. [2020-12-21 21:32:14,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:32:14,763 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-12-21 21:32:14,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-12-21 21:32:14,764 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 59 [2020-12-21 21:32:14,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:32:14,764 INFO L225 Difference]: With dead ends: 98 [2020-12-21 21:32:14,764 INFO L226 Difference]: Without dead ends: 64 [2020-12-21 21:32:14,765 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2020-12-21 21:32:14,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-12-21 21:32:14,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-12-21 21:32:14,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-21 21:32:14,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-12-21 21:32:14,768 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 59 [2020-12-21 21:32:14,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:32:14,769 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-12-21 21:32:14,769 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-12-21 21:32:14,769 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-12-21 21:32:14,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-21 21:32:14,769 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:32:14,770 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:32:14,983 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2020-12-21 21:32:14,984 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:32:14,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:32:14,985 INFO L82 PathProgramCache]: Analyzing trace with hash 327606039, now seen corresponding path program 26 times [2020-12-21 21:32:14,985 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:32:14,985 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565815681] [2020-12-21 21:32:14,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:32:15,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:32:15,538 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2020-12-21 21:32:15,538 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565815681] [2020-12-21 21:32:15,538 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1829218341] [2020-12-21 21:32:15,538 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:32:15,622 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-21 21:32:15,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:32:15,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-21 21:32:15,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:32:15,703 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2020-12-21 21:32:15,703 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:32:15,704 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-12-21 21:32:15,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282310513] [2020-12-21 21:32:15,704 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-12-21 21:32:15,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:32:15,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-12-21 21:32:15,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2020-12-21 21:32:15,705 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 30 states. [2020-12-21 21:32:15,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:32:15,802 INFO L93 Difference]: Finished difference Result 101 states and 106 transitions. [2020-12-21 21:32:15,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-21 21:32:15,802 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 61 [2020-12-21 21:32:15,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:32:15,803 INFO L225 Difference]: With dead ends: 101 [2020-12-21 21:32:15,803 INFO L226 Difference]: Without dead ends: 66 [2020-12-21 21:32:15,804 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2020-12-21 21:32:15,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-21 21:32:15,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-12-21 21:32:15,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-12-21 21:32:15,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-12-21 21:32:15,808 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 61 [2020-12-21 21:32:15,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:32:15,808 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-12-21 21:32:15,808 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-12-21 21:32:15,808 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-12-21 21:32:15,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-12-21 21:32:15,809 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:32:15,809 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:32:16,022 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-12-21 21:32:16,023 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:32:16,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:32:16,024 INFO L82 PathProgramCache]: Analyzing trace with hash -1579713258, now seen corresponding path program 27 times [2020-12-21 21:32:16,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:32:16,024 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004151309] [2020-12-21 21:32:16,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:32:16,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:32:16,544 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2020-12-21 21:32:16,544 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004151309] [2020-12-21 21:32:16,545 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257141016] [2020-12-21 21:32:16,545 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:32:41,101 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2020-12-21 21:32:41,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:32:41,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 50 conjunts are in the unsatisfiable core [2020-12-21 21:32:41,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:32:41,270 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 27 proven. 378 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2020-12-21 21:32:41,270 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:32:41,270 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31] total 32 [2020-12-21 21:32:41,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242440582] [2020-12-21 21:32:41,271 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-21 21:32:41,271 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:32:41,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-21 21:32:41,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2020-12-21 21:32:41,272 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 32 states. [2020-12-21 21:32:41,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:32:41,371 INFO L93 Difference]: Finished difference Result 104 states and 109 transitions. [2020-12-21 21:32:41,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-12-21 21:32:41,371 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 63 [2020-12-21 21:32:41,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:32:41,372 INFO L225 Difference]: With dead ends: 104 [2020-12-21 21:32:41,372 INFO L226 Difference]: Without dead ends: 68 [2020-12-21 21:32:41,373 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2020-12-21 21:32:41,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-12-21 21:32:41,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2020-12-21 21:32:41,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-21 21:32:41,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-12-21 21:32:41,376 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 63 [2020-12-21 21:32:41,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:32:41,376 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-12-21 21:32:41,376 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-21 21:32:41,376 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-12-21 21:32:41,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-21 21:32:41,377 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:32:41,377 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:32:41,578 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2020-12-21 21:32:41,578 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:32:41,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:32:41,579 INFO L82 PathProgramCache]: Analyzing trace with hash 1164401079, now seen corresponding path program 28 times [2020-12-21 21:32:41,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:32:41,579 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929529231] [2020-12-21 21:32:41,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:32:41,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:32:42,123 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2020-12-21 21:32:42,123 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929529231] [2020-12-21 21:32:42,124 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518147493] [2020-12-21 21:32:42,124 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-21 21:32:42,204 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-21 21:32:42,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-21 21:32:42,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 30 conjunts are in the unsatisfiable core [2020-12-21 21:32:42,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-21 21:32:42,297 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2020-12-21 21:32:42,297 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-21 21:32:42,297 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-12-21 21:32:42,297 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924589150] [2020-12-21 21:32:42,298 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-21 21:32:42,298 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-21 21:32:42,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-21 21:32:42,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2020-12-21 21:32:42,299 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 32 states. [2020-12-21 21:32:42,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-21 21:32:42,431 INFO L93 Difference]: Finished difference Result 107 states and 112 transitions. [2020-12-21 21:32:42,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-12-21 21:32:42,432 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 65 [2020-12-21 21:32:42,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-21 21:32:42,433 INFO L225 Difference]: With dead ends: 107 [2020-12-21 21:32:42,433 INFO L226 Difference]: Without dead ends: 70 [2020-12-21 21:32:42,434 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2020-12-21 21:32:42,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-12-21 21:32:42,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-12-21 21:32:42,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-12-21 21:32:42,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-12-21 21:32:42,437 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 65 [2020-12-21 21:32:42,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-21 21:32:42,438 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-12-21 21:32:42,438 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-21 21:32:42,438 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-12-21 21:32:42,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-12-21 21:32:42,439 INFO L414 BasicCegarLoop]: Found error trace [2020-12-21 21:32:42,439 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-21 21:32:42,653 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2020-12-21 21:32:42,653 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-21 21:32:42,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-21 21:32:42,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1151591434, now seen corresponding path program 29 times [2020-12-21 21:32:42,654 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-21 21:32:42,655 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191058518] [2020-12-21 21:32:42,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-21 21:32:42,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-21 21:32:43,229 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2020-12-21 21:32:43,229 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191058518] [2020-12-21 21:32:43,229 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [128886594] [2020-12-21 21:32:43,230 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true