/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops/compact.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:37:08,045 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:37:08,048 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:37:08,086 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:37:08,105 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:37:08,107 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:37:08,108 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:37:08,109 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:37:08,111 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:37:08,112 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:37:08,115 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:37:08,120 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:37:08,121 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:37:08,122 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:37:08,123 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:37:08,126 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:37:08,132 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:37:08,140 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:37:08,140 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:37:08,141 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:37:08,145 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 17:37:08,165 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:37:08,166 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:37:08,168 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:37:08,168 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:37:08,169 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:37:08,169 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:37:08,169 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:37:08,169 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:37:08,169 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:37:08,169 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:37:08,170 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:37:08,170 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:37:08,171 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:37:08,171 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:37:08,171 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:37:08,171 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:37:08,171 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 17:37:08,171 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:37:08,171 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:37:08,172 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:37:08,172 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:37:08,173 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 17:37:08,173 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:37:08,480 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:37:08,498 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:37:08,500 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:37:08,501 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:37:08,502 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:37:08,503 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/compact.c [2021-05-02 17:37:08,567 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/963822e21/39f06d968354487ea4ed015fb7e8bd70/FLAGa081c69e0 [2021-05-02 17:37:08,972 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:37:08,972 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/compact.c [2021-05-02 17:37:08,977 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/963822e21/39f06d968354487ea4ed015fb7e8bd70/FLAGa081c69e0 [2021-05-02 17:37:09,376 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/963822e21/39f06d968354487ea4ed015fb7e8bd70 [2021-05-02 17:37:09,378 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:37:09,381 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 17:37:09,386 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:37:09,386 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:37:09,390 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:37:09,390 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,391 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@29a8bd93 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09, skipping insertion in model container [2021-05-02 17:37:09,391 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,398 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:37:09,409 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:37:09,537 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/compact.c[609,622] [2021-05-02 17:37:09,540 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:37:09,550 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:37:09,565 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/compact.c[609,622] [2021-05-02 17:37:09,566 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:37:09,577 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:37:09,578 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09 WrapperNode [2021-05-02 17:37:09,578 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:37:09,579 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:37:09,579 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:37:09,579 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:37:09,618 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,619 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,634 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,634 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,643 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,647 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,648 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,665 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:37:09,666 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:37:09,666 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:37:09,666 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:37:09,667 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:37:09,739 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:37:09,739 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:37:09,739 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:37:09,740 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:37:09,740 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:37:09,740 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:37:09,740 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:37:09,741 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:37:09,741 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-05-02 17:37:09,741 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:37:09,741 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:37:09,741 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:37:09,742 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:37:09,742 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:37:09,742 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:37:09,742 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:37:10,048 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:37:10,048 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 17:37:10,050 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:37:10 BoogieIcfgContainer [2021-05-02 17:37:10,050 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:37:10,050 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 17:37:10,050 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 17:37:10,051 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 17:37:10,053 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:37:10" (1/1) ... [2021-05-02 17:37:10,068 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:37:10 BasicIcfg [2021-05-02 17:37:10,068 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 17:37:10,069 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:37:10,069 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:37:10,072 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:37:10,072 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:37:09" (1/4) ... [2021-05-02 17:37:10,073 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ecbe106 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:37:10, skipping insertion in model container [2021-05-02 17:37:10,073 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09" (2/4) ... [2021-05-02 17:37:10,073 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ecbe106 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:37:10, skipping insertion in model container [2021-05-02 17:37:10,073 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:37:10" (3/4) ... [2021-05-02 17:37:10,073 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7ecbe106 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:37:10, skipping insertion in model container [2021-05-02 17:37:10,073 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:37:10" (4/4) ... [2021-05-02 17:37:10,074 INFO L111 eAbstractionObserver]: Analyzing ICFG compact.cJordan [2021-05-02 17:37:10,079 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:37:10,082 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:37:10,094 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:37:10,109 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:37:10,109 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 17:37:10,109 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 17:37:10,109 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:37:10,110 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:37:10,110 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:37:10,110 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:37:10,110 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:37:10,120 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:10,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-05-02 17:37:10,125 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:10,126 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:10,126 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:10,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:10,131 INFO L82 PathProgramCache]: Analyzing trace with hash -282074373, now seen corresponding path program 1 times [2021-05-02 17:37:10,139 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:10,140 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761450452] [2021-05-02 17:37:10,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:10,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:10,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,319 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:10,319 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:10,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761450452] [2021-05-02 17:37:10,320 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761450452] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:10,320 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:10,320 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:37:10,321 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498510014] [2021-05-02 17:37:10,324 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:37:10,325 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:10,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:37:10,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:37:10,337 INFO L87 Difference]: Start difference. First operand has 18 states, 12 states have (on average 1.5) internal successors, (18), 13 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:10,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:10,395 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2021-05-02 17:37:10,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:37:10,397 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-05-02 17:37:10,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:10,402 INFO L225 Difference]: With dead ends: 27 [2021-05-02 17:37:10,403 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 17:37:10,404 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 42.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:37:10,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 17:37:10,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 14. [2021-05-02 17:37:10,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:10,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 17:37:10,432 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2021-05-02 17:37:10,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:10,433 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 17:37:10,433 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:10,433 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 17:37:10,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-05-02 17:37:10,434 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:10,435 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:10,436 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:37:10,436 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:10,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:10,437 INFO L82 PathProgramCache]: Analyzing trace with hash -282044551, now seen corresponding path program 1 times [2021-05-02 17:37:10,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:10,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854478685] [2021-05-02 17:37:10,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:10,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:10,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,605 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:37:10,605 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:10,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854478685] [2021-05-02 17:37:10,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1854478685] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:10,606 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:10,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:37:10,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038052025] [2021-05-02 17:37:10,607 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:37:10,607 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:10,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:37:10,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:37:10,608 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:10,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:10,726 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-05-02 17:37:10,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:37:10,737 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-05-02 17:37:10,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:10,738 INFO L225 Difference]: With dead ends: 19 [2021-05-02 17:37:10,738 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 17:37:10,739 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 139.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:37:10,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 17:37:10,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 16. [2021-05-02 17:37:10,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:10,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 17:37:10,742 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 10 [2021-05-02 17:37:10,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:10,742 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 17:37:10,742 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:10,742 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 17:37:10,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 17:37:10,742 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:10,743 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:10,743 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:37:10,743 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:10,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:10,744 INFO L82 PathProgramCache]: Analyzing trace with hash 1097051654, now seen corresponding path program 1 times [2021-05-02 17:37:10,744 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:10,744 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204942997] [2021-05-02 17:37:10,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:10,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:10,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,869 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:37:10,869 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:10,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204942997] [2021-05-02 17:37:10,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204942997] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:10,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1728113539] [2021-05-02 17:37:10,870 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 [2021-05-02 17:37:10,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,938 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:37:10,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:10,994 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:37:10,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1728113539] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:10,994 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:10,995 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 17:37:10,995 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669196345] [2021-05-02 17:37:10,995 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:37:10,995 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:10,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:37:10,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:37:10,997 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:11,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:11,096 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2021-05-02 17:37:11,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:37:11,097 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 17:37:11,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:11,099 INFO L225 Difference]: With dead ends: 24 [2021-05-02 17:37:11,099 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 17:37:11,099 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 85.4ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:37:11,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 17:37:11,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2021-05-02 17:37:11,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:11,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2021-05-02 17:37:11,106 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2021-05-02 17:37:11,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:11,106 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2021-05-02 17:37:11,106 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 5 states have internal predecessors, (15), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:11,106 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2021-05-02 17:37:11,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 17:37:11,107 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:11,107 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:11,321 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 17:37:11,321 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:11,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:11,322 INFO L82 PathProgramCache]: Analyzing trace with hash -3293539, now seen corresponding path program 2 times [2021-05-02 17:37:11,322 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:11,322 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563741615] [2021-05-02 17:37:11,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:11,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:11,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:11,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:11,476 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 17:37:11,476 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:11,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563741615] [2021-05-02 17:37:11,476 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1563741615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:11,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1041296316] [2021-05-02 17:37:11,476 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 [2021-05-02 17:37:11,543 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:37:11,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:11,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 17:37:11,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:11,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:11,656 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 17:37:11,657 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1041296316] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:11,657 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:11,657 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 17:37:11,657 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798551771] [2021-05-02 17:37:11,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:37:11,658 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:11,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:37:11,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:37:11,659 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:11,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:11,782 INFO L93 Difference]: Finished difference Result 29 states and 30 transitions. [2021-05-02 17:37:11,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:37:11,782 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 17:37:11,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:11,786 INFO L225 Difference]: With dead ends: 29 [2021-05-02 17:37:11,786 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 17:37:11,786 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 110.0ms TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:37:11,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 17:37:11,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2021-05-02 17:37:11,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:11,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-05-02 17:37:11,795 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 20 [2021-05-02 17:37:11,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:11,796 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-05-02 17:37:11,796 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:11,796 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-05-02 17:37:11,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 17:37:11,797 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:11,797 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:12,012 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:12,013 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:12,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:12,013 INFO L82 PathProgramCache]: Analyzing trace with hash -1517580574, now seen corresponding path program 3 times [2021-05-02 17:37:12,014 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:12,014 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094834497] [2021-05-02 17:37:12,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:12,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:12,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:12,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:12,198 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 17:37:12,199 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:12,199 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094834497] [2021-05-02 17:37:12,199 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2094834497] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:12,199 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347449558] [2021-05-02 17:37:12,200 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 [2021-05-02 17:37:12,286 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 17:37:12,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:12,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 17:37:12,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:12,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:12,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:12,437 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 17:37:12,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1347449558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:12,437 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:12,438 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 17:37:12,438 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912577159] [2021-05-02 17:37:12,441 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:37:12,441 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:12,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:37:12,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:37:12,442 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:12,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:12,589 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2021-05-02 17:37:12,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:37:12,590 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 17:37:12,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:12,591 INFO L225 Difference]: With dead ends: 34 [2021-05-02 17:37:12,591 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 17:37:12,592 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 113.7ms TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:37:12,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 17:37:12,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 31. [2021-05-02 17:37:12,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 27 states have (on average 1.0740740740740742) internal successors, (29), 27 states have internal predecessors, (29), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:12,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2021-05-02 17:37:12,604 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 25 [2021-05-02 17:37:12,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:12,605 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2021-05-02 17:37:12,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:12,605 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2021-05-02 17:37:12,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 17:37:12,605 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:12,605 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:12,820 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:12,821 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:12,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:12,821 INFO L82 PathProgramCache]: Analyzing trace with hash -2017057343, now seen corresponding path program 4 times [2021-05-02 17:37:12,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:12,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796567454] [2021-05-02 17:37:12,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:12,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:12,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:12,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:12,984 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-05-02 17:37:12,984 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:12,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796567454] [2021-05-02 17:37:12,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [796567454] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:12,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1798178083] [2021-05-02 17:37:12,985 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 [2021-05-02 17:37:13,041 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:37:13,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:13,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 17:37:13,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:13,058 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:13,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:13,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:13,127 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 17:37:13,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1798178083] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:13,128 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:13,128 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 17:37:13,128 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593136549] [2021-05-02 17:37:13,128 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:37:13,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:13,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:37:13,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:37:13,129 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand has 9 states, 9 states have (on average 4.111111111111111) internal successors, (37), 8 states have internal predecessors, (37), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:13,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:13,272 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2021-05-02 17:37:13,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:37:13,273 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.111111111111111) internal successors, (37), 8 states have internal predecessors, (37), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-05-02 17:37:13,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:13,273 INFO L225 Difference]: With dead ends: 39 [2021-05-02 17:37:13,273 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 17:37:13,274 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 109.4ms TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:37:13,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 17:37:13,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2021-05-02 17:37:13,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:13,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-05-02 17:37:13,277 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 30 [2021-05-02 17:37:13,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:13,277 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-05-02 17:37:13,278 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.111111111111111) internal successors, (37), 8 states have internal predecessors, (37), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:13,278 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-05-02 17:37:13,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 17:37:13,278 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:13,279 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:13,502 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:13,502 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:13,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:13,503 INFO L82 PathProgramCache]: Analyzing trace with hash -1006809154, now seen corresponding path program 5 times [2021-05-02 17:37:13,503 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:13,503 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971431339] [2021-05-02 17:37:13,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:13,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:13,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:13,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:13,670 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-05-02 17:37:13,671 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:13,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971431339] [2021-05-02 17:37:13,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [971431339] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:13,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101601121] [2021-05-02 17:37:13,671 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 [2021-05-02 17:37:14,009 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 17:37:14,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:14,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 17:37:14,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:14,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:14,107 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-05-02 17:37:14,107 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101601121] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:14,107 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:14,107 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 17:37:14,107 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276363114] [2021-05-02 17:37:14,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:37:14,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:14,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:37:14,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:37:14,110 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:14,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:14,302 INFO L93 Difference]: Finished difference Result 44 states and 45 transitions. [2021-05-02 17:37:14,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:37:14,303 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 17:37:14,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:14,305 INFO L225 Difference]: With dead ends: 44 [2021-05-02 17:37:14,305 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 17:37:14,305 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 128.5ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:37:14,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 17:37:14,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 41. [2021-05-02 17:37:14,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:14,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2021-05-02 17:37:14,316 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 35 [2021-05-02 17:37:14,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:14,316 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2021-05-02 17:37:14,316 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:14,316 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2021-05-02 17:37:14,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 17:37:14,319 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:14,319 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:14,526 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 17:37:14,527 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:14,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:14,527 INFO L82 PathProgramCache]: Analyzing trace with hash 1194314981, now seen corresponding path program 6 times [2021-05-02 17:37:14,528 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:14,528 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1078971313] [2021-05-02 17:37:14,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:14,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:14,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:14,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:14,718 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-05-02 17:37:14,718 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:14,719 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1078971313] [2021-05-02 17:37:14,719 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1078971313] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:14,719 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [76605663] [2021-05-02 17:37:14,719 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 [2021-05-02 17:37:15,294 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 17:37:15,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:15,297 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 17:37:15,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:15,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:15,424 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 51 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 17:37:15,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [76605663] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:15,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:15,425 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 17:37:15,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357684118] [2021-05-02 17:37:15,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:37:15,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:15,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:37:15,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:37:15,427 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 10 states have internal predecessors, (47), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:15,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:15,663 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2021-05-02 17:37:15,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:37:15,664 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 10 states have internal predecessors, (47), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 40 [2021-05-02 17:37:15,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:15,665 INFO L225 Difference]: With dead ends: 49 [2021-05-02 17:37:15,665 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 17:37:15,665 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 140.0ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:37:15,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 17:37:15,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2021-05-02 17:37:15,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 42 states have (on average 1.0476190476190477) internal successors, (44), 42 states have internal predecessors, (44), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:15,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-05-02 17:37:15,668 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 40 [2021-05-02 17:37:15,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:15,669 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-05-02 17:37:15,669 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 4.2727272727272725) internal successors, (47), 10 states have internal predecessors, (47), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:15,669 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-05-02 17:37:15,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 17:37:15,669 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:15,670 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:15,875 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:15,876 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:15,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:15,876 INFO L82 PathProgramCache]: Analyzing trace with hash -2124238694, now seen corresponding path program 7 times [2021-05-02 17:37:15,876 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:15,876 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931871110] [2021-05-02 17:37:15,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:15,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:16,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,048 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-02 17:37:16,048 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:16,048 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931871110] [2021-05-02 17:37:16,048 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1931871110] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:16,048 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968705883] [2021-05-02 17:37:16,048 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 [2021-05-02 17:37:16,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 17:37:16,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:16,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:16,234 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-02 17:37:16,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1968705883] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:16,235 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:16,235 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 17:37:16,235 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119959902] [2021-05-02 17:37:16,235 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 17:37:16,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:16,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 17:37:16,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:37:16,236 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:16,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:16,498 INFO L93 Difference]: Finished difference Result 54 states and 55 transitions. [2021-05-02 17:37:16,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 17:37:16,499 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 17:37:16,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:16,499 INFO L225 Difference]: With dead ends: 54 [2021-05-02 17:37:16,499 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 17:37:16,500 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 166.5ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:37:16,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 17:37:16,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 51. [2021-05-02 17:37:16,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 47 states have internal predecessors, (49), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:16,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2021-05-02 17:37:16,503 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 45 [2021-05-02 17:37:16,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:16,503 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2021-05-02 17:37:16,503 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:16,503 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2021-05-02 17:37:16,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 17:37:16,504 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:16,504 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:16,720 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:16,721 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:16,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:16,721 INFO L82 PathProgramCache]: Analyzing trace with hash -576654327, now seen corresponding path program 8 times [2021-05-02 17:37:16,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:16,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899705707] [2021-05-02 17:37:16,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:16,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:16,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:16,902 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2021-05-02 17:37:16,902 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:16,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899705707] [2021-05-02 17:37:16,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899705707] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:16,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [894185409] [2021-05-02 17:37:16,903 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 [2021-05-02 17:37:16,983 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:37:16,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:16,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 17:37:16,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:17,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:17,105 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 17:37:17,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [894185409] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:17,106 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:17,106 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 17:37:17,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072742120] [2021-05-02 17:37:17,106 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:37:17,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:17,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:37:17,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:37:17,107 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand has 13 states, 13 states have (on average 4.384615384615385) internal successors, (57), 12 states have internal predecessors, (57), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:17,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:17,386 INFO L93 Difference]: Finished difference Result 59 states and 60 transitions. [2021-05-02 17:37:17,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 17:37:17,386 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 4.384615384615385) internal successors, (57), 12 states have internal predecessors, (57), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 17:37:17,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:17,387 INFO L225 Difference]: With dead ends: 59 [2021-05-02 17:37:17,387 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 17:37:17,387 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 171.0ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:37:17,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 17:37:17,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2021-05-02 17:37:17,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 52 states have (on average 1.0384615384615385) internal successors, (54), 52 states have internal predecessors, (54), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:17,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2021-05-02 17:37:17,391 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 50 [2021-05-02 17:37:17,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:17,391 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2021-05-02 17:37:17,391 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 4.384615384615385) internal successors, (57), 12 states have internal predecessors, (57), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:17,391 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2021-05-02 17:37:17,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 17:37:17,392 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:17,392 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:17,616 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:37:17,617 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:17,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:17,617 INFO L82 PathProgramCache]: Analyzing trace with hash -1864011402, now seen corresponding path program 9 times [2021-05-02 17:37:17,617 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:17,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999182196] [2021-05-02 17:37:17,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:17,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:17,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:17,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:17,808 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 117 trivial. 0 not checked. [2021-05-02 17:37:17,809 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:17,809 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999182196] [2021-05-02 17:37:17,809 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999182196] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:17,809 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [85655354] [2021-05-02 17:37:17,809 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 [2021-05-02 17:37:19,057 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 17:37:19,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:19,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 17:37:19,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:19,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,233 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 17:37:19,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [85655354] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:19,233 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:19,233 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 17:37:19,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561536702] [2021-05-02 17:37:19,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 17:37:19,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:19,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 17:37:19,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:37:19,235 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand has 14 states, 14 states have (on average 4.428571428571429) internal successors, (62), 13 states have internal predecessors, (62), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:19,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:19,575 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2021-05-02 17:37:19,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 17:37:19,576 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.428571428571429) internal successors, (62), 13 states have internal predecessors, (62), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 17:37:19,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:19,577 INFO L225 Difference]: With dead ends: 64 [2021-05-02 17:37:19,577 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 17:37:19,577 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 173.5ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:37:19,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 17:37:19,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2021-05-02 17:37:19,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 57 states have internal predecessors, (59), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:19,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 62 transitions. [2021-05-02 17:37:19,592 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 62 transitions. Word has length 55 [2021-05-02 17:37:19,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:19,592 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 62 transitions. [2021-05-02 17:37:19,593 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 4.428571428571429) internal successors, (62), 13 states have internal predecessors, (62), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:19,593 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 62 transitions. [2021-05-02 17:37:19,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 17:37:19,593 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:19,593 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:19,794 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:19,794 INFO L428 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:19,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:19,794 INFO L82 PathProgramCache]: Analyzing trace with hash 1848630061, now seen corresponding path program 10 times [2021-05-02 17:37:19,795 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:19,795 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469862673] [2021-05-02 17:37:19,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:19,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:20,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:20,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:20,012 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-05-02 17:37:20,012 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:20,012 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469862673] [2021-05-02 17:37:20,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1469862673] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:20,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [84488608] [2021-05-02 17:37:20,013 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 [2021-05-02 17:37:20,086 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:37:20,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:20,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 17:37:20,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:20,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,278 INFO L134 CoverageAnalysis]: Checked inductivity of 245 backedges. 0 proven. 145 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 17:37:20,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [84488608] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:20,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:20,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 17:37:20,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689944076] [2021-05-02 17:37:20,279 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 17:37:20,280 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:20,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 17:37:20,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:37:20,280 INFO L87 Difference]: Start difference. First operand 61 states and 62 transitions. Second operand has 15 states, 15 states have (on average 4.466666666666667) internal successors, (67), 14 states have internal predecessors, (67), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:20,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:20,664 INFO L93 Difference]: Finished difference Result 69 states and 70 transitions. [2021-05-02 17:37:20,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 17:37:20,664 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.466666666666667) internal successors, (67), 14 states have internal predecessors, (67), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 60 [2021-05-02 17:37:20,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:20,667 INFO L225 Difference]: With dead ends: 69 [2021-05-02 17:37:20,667 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 17:37:20,667 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 59 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 208.1ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:37:20,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 17:37:20,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2021-05-02 17:37:20,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 62 states have (on average 1.032258064516129) internal successors, (64), 62 states have internal predecessors, (64), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:20,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-05-02 17:37:20,671 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 60 [2021-05-02 17:37:20,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:20,672 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-05-02 17:37:20,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 4.466666666666667) internal successors, (67), 14 states have internal predecessors, (67), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:20,672 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-05-02 17:37:20,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 17:37:20,674 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:20,674 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:20,881 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:20,881 INFO L428 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:20,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:20,881 INFO L82 PathProgramCache]: Analyzing trace with hash -802205102, now seen corresponding path program 11 times [2021-05-02 17:37:20,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:20,882 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608241026] [2021-05-02 17:37:20,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:20,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:21,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:21,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:21,104 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-05-02 17:37:21,104 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:21,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608241026] [2021-05-02 17:37:21,105 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608241026] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:21,105 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600775869] [2021-05-02 17:37:21,105 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 [2021-05-02 17:38:23,057 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-02 17:38:23,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:38:23,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 17:38:23,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:38:23,214 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:23,250 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2021-05-02 17:38:23,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600775869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:23,251 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:38:23,251 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 17:38:23,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513421087] [2021-05-02 17:38:23,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 17:38:23,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:23,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 17:38:23,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:38:23,252 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 15 states have internal predecessors, (35), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:23,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:23,665 INFO L93 Difference]: Finished difference Result 74 states and 75 transitions. [2021-05-02 17:38:23,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 17:38:23,665 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 15 states have internal predecessors, (35), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 17:38:23,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:23,666 INFO L225 Difference]: With dead ends: 74 [2021-05-02 17:38:23,666 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 17:38:23,667 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 64 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 204.4ms TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2021-05-02 17:38:23,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 17:38:23,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 71. [2021-05-02 17:38:23,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 67 states have (on average 1.0298507462686568) internal successors, (69), 67 states have internal predecessors, (69), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:23,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 72 transitions. [2021-05-02 17:38:23,669 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 72 transitions. Word has length 65 [2021-05-02 17:38:23,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:23,670 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 72 transitions. [2021-05-02 17:38:23,670 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 15 states have internal predecessors, (35), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:23,670 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 72 transitions. [2021-05-02 17:38:23,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-02 17:38:23,671 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:23,671 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:23,871 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 17:38:23,872 INFO L428 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:23,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:23,872 INFO L82 PathProgramCache]: Analyzing trace with hash 1131594321, now seen corresponding path program 12 times [2021-05-02 17:38:23,872 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:23,872 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630924699] [2021-05-02 17:38:23,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:23,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:24,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:24,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:24,128 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-05-02 17:38:24,128 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:24,128 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630924699] [2021-05-02 17:38:24,128 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630924699] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:24,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473739895] [2021-05-02 17:38:24,129 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 [2021-05-02 17:38:27,421 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 17:38:27,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:38:27,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 17:38:27,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:38:27,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:27,598 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-05-02 17:38:27,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473739895] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:27,598 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:38:27,598 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 17:38:27,599 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933838272] [2021-05-02 17:38:27,599 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 17:38:27,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:27,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 17:38:27,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 17:38:27,601 INFO L87 Difference]: Start difference. First operand 71 states and 72 transitions. Second operand has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:28,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:28,037 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2021-05-02 17:38:28,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 17:38:28,038 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 70 [2021-05-02 17:38:28,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:28,038 INFO L225 Difference]: With dead ends: 79 [2021-05-02 17:38:28,038 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 17:38:28,039 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 220.8ms TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-05-02 17:38:28,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 17:38:28,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2021-05-02 17:38:28,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 72 states have (on average 1.0277777777777777) internal successors, (74), 72 states have internal predecessors, (74), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:28,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 77 transitions. [2021-05-02 17:38:28,042 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 77 transitions. Word has length 70 [2021-05-02 17:38:28,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:28,042 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 77 transitions. [2021-05-02 17:38:28,042 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 16 states have internal predecessors, (37), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:28,042 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 77 transitions. [2021-05-02 17:38:28,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 17:38:28,043 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:28,043 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:28,249 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 17:38:28,249 INFO L428 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:28,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:28,250 INFO L82 PathProgramCache]: Analyzing trace with hash -1553329362, now seen corresponding path program 13 times [2021-05-02 17:38:28,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:28,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605033363] [2021-05-02 17:38:28,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:28,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:28,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:28,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:28,503 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-05-02 17:38:28,504 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:28,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605033363] [2021-05-02 17:38:28,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605033363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:28,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1445280779] [2021-05-02 17:38:28,504 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 [2021-05-02 17:38:28,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:28,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 17:38:28,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:38:28,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:28,771 INFO L134 CoverageAnalysis]: Checked inductivity of 416 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2021-05-02 17:38:28,771 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1445280779] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:28,771 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:38:28,771 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 17:38:28,772 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325468813] [2021-05-02 17:38:28,772 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 17:38:28,772 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:28,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 17:38:28,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 17:38:28,773 INFO L87 Difference]: Start difference. First operand 76 states and 77 transitions. Second operand has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:29,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:29,281 INFO L93 Difference]: Finished difference Result 84 states and 85 transitions. [2021-05-02 17:38:29,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 17:38:29,281 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-02 17:38:29,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:29,282 INFO L225 Difference]: With dead ends: 84 [2021-05-02 17:38:29,282 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 17:38:29,283 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 229.0ms TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:38:29,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 17:38:29,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 81. [2021-05-02 17:38:29,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 77 states have (on average 1.025974025974026) internal successors, (79), 77 states have internal predecessors, (79), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:29,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 82 transitions. [2021-05-02 17:38:29,285 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 82 transitions. Word has length 75 [2021-05-02 17:38:29,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:29,285 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 82 transitions. [2021-05-02 17:38:29,286 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:29,286 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 82 transitions. [2021-05-02 17:38:29,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 17:38:29,286 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:29,287 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:29,500 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 17:38:29,501 INFO L428 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:29,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:29,501 INFO L82 PathProgramCache]: Analyzing trace with hash 1937762677, now seen corresponding path program 14 times [2021-05-02 17:38:29,501 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:29,501 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567273681] [2021-05-02 17:38:29,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:29,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:29,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:29,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:29,793 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2021-05-02 17:38:29,793 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:29,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567273681] [2021-05-02 17:38:29,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1567273681] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:29,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177181479] [2021-05-02 17:38:29,794 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 [2021-05-02 17:38:29,875 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:38:29,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:38:29,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 17:38:29,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:38:29,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:30,028 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 287 trivial. 0 not checked. [2021-05-02 17:38:30,028 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177181479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:30,028 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:38:30,028 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 17:38:30,028 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416458973] [2021-05-02 17:38:30,029 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 17:38:30,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:30,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 17:38:30,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:38:30,029 INFO L87 Difference]: Start difference. First operand 81 states and 82 transitions. Second operand has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:30,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:30,507 INFO L93 Difference]: Finished difference Result 89 states and 90 transitions. [2021-05-02 17:38:30,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 17:38:30,507 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 80 [2021-05-02 17:38:30,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:30,508 INFO L225 Difference]: With dead ends: 89 [2021-05-02 17:38:30,508 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 17:38:30,508 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 78 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 288.2ms TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:38:30,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 17:38:30,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2021-05-02 17:38:30,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 82 states have (on average 1.024390243902439) internal successors, (84), 82 states have internal predecessors, (84), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:30,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 87 transitions. [2021-05-02 17:38:30,511 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 87 transitions. Word has length 80 [2021-05-02 17:38:30,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:30,511 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 87 transitions. [2021-05-02 17:38:30,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 18 states have internal predecessors, (41), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:30,511 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 87 transitions. [2021-05-02 17:38:30,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 17:38:30,512 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:30,512 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:30,735 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:38:30,735 INFO L428 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:30,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:30,736 INFO L82 PathProgramCache]: Analyzing trace with hash 1363112970, now seen corresponding path program 15 times [2021-05-02 17:38:30,736 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:30,736 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707826876] [2021-05-02 17:38:30,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:30,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:31,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:31,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:31,058 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-05-02 17:38:31,058 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:31,058 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707826876] [2021-05-02 17:38:31,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1707826876] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:31,058 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509449312] [2021-05-02 17:38:31,058 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 [2021-05-02 17:38:37,807 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-02 17:38:37,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:38:37,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 17:38:37,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:38:37,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:37,993 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-05-02 17:38:37,993 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509449312] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:37,993 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:38:37,993 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 17:38:37,993 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783234904] [2021-05-02 17:38:37,994 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 17:38:37,994 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:37,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 17:38:37,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:38:37,995 INFO L87 Difference]: Start difference. First operand 86 states and 87 transitions. Second operand has 20 states, 20 states have (on average 4.6) internal successors, (92), 19 states have internal predecessors, (92), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:38,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:38,538 INFO L93 Difference]: Finished difference Result 94 states and 95 transitions. [2021-05-02 17:38:38,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 17:38:38,538 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 4.6) internal successors, (92), 19 states have internal predecessors, (92), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-02 17:38:38,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:38,539 INFO L225 Difference]: With dead ends: 94 [2021-05-02 17:38:38,539 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 17:38:38,539 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 305.8ms TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2021-05-02 17:38:38,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 17:38:38,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 91. [2021-05-02 17:38:38,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 87 states have (on average 1.0229885057471264) internal successors, (89), 87 states have internal predecessors, (89), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:38,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 92 transitions. [2021-05-02 17:38:38,542 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 92 transitions. Word has length 85 [2021-05-02 17:38:38,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:38,542 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 92 transitions. [2021-05-02 17:38:38,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 4.6) internal successors, (92), 19 states have internal predecessors, (92), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:38,542 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 92 transitions. [2021-05-02 17:38:38,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-05-02 17:38:38,543 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:38,543 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:38,749 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 17:38:38,749 INFO L428 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:38,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:38,750 INFO L82 PathProgramCache]: Analyzing trace with hash -2081582951, now seen corresponding path program 16 times [2021-05-02 17:38:38,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:38,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933025609] [2021-05-02 17:38:38,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:38,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:39,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:39,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:39,056 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 376 trivial. 0 not checked. [2021-05-02 17:38:39,057 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:39,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933025609] [2021-05-02 17:38:39,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1933025609] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:39,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873252633] [2021-05-02 17:38:39,057 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 [2021-05-02 17:38:39,196 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:38:39,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:38:39,198 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 17:38:39,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:38:39,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:38:39,384 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 376 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 17:38:39,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1873252633] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:39,385 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:38:39,385 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 17:38:39,385 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757990735] [2021-05-02 17:38:39,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 17:38:39,385 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:38:39,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 17:38:39,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 17:38:39,386 INFO L87 Difference]: Start difference. First operand 91 states and 92 transitions. Second operand has 21 states, 21 states have (on average 4.619047619047619) internal successors, (97), 20 states have internal predecessors, (97), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:40,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:38:40,029 INFO L93 Difference]: Finished difference Result 99 states and 100 transitions. [2021-05-02 17:38:40,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 17:38:40,029 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 4.619047619047619) internal successors, (97), 20 states have internal predecessors, (97), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 90 [2021-05-02 17:38:40,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:38:40,030 INFO L225 Difference]: With dead ends: 99 [2021-05-02 17:38:40,030 INFO L226 Difference]: Without dead ends: 99 [2021-05-02 17:38:40,030 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 315.5ms TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2021-05-02 17:38:40,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-02 17:38:40,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 96. [2021-05-02 17:38:40,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 92 states have (on average 1.0217391304347827) internal successors, (94), 92 states have internal predecessors, (94), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:40,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 97 transitions. [2021-05-02 17:38:40,032 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 97 transitions. Word has length 90 [2021-05-02 17:38:40,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:38:40,033 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 97 transitions. [2021-05-02 17:38:40,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 4.619047619047619) internal successors, (97), 20 states have internal predecessors, (97), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:38:40,033 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 97 transitions. [2021-05-02 17:38:40,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 17:38:40,033 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:38:40,033 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:38:40,249 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 17:38:40,249 INFO L428 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:38:40,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:38:40,249 INFO L82 PathProgramCache]: Analyzing trace with hash 1591293158, now seen corresponding path program 17 times [2021-05-02 17:38:40,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:38:40,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147034854] [2021-05-02 17:38:40,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:38:40,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:40,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:38:40,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:38:40,579 INFO L134 CoverageAnalysis]: Checked inductivity of 714 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 425 trivial. 0 not checked. [2021-05-02 17:38:40,580 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:38:40,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147034854] [2021-05-02 17:38:40,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1147034854] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:38:40,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2135169269] [2021-05-02 17:38:40,580 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