/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/eureka_01-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:37:07,952 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:37:07,954 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:37:07,971 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:37:07,978 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:37:07,979 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:37:07,980 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:37:07,980 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:37:07,981 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:37:07,981 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:37:07,983 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:37:07,984 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:37:07,987 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:37:07,992 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:37:07,993 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:37:07,995 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:37:08,003 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:37:08,008 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:37:08,008 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:37:08,009 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:37:08,129 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 17:37:08,164 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:37:08,164 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:37:08,165 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:37:08,165 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:37:08,165 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:37:08,165 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:37:08,166 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:37:08,166 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:37:08,166 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:37:08,166 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:37:08,166 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:37:08,166 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:37:08,166 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:37:08,166 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:37:08,166 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:37:08,166 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:37:08,167 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 17:37:08,167 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:37:08,167 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:37:08,167 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:37:08,167 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:37:08,167 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 17:37:08,167 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:37:08,429 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:37:08,452 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:37:08,454 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:37:08,455 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:37:08,455 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:37:08,456 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/eureka_01-2.c [2021-05-02 17:37:08,503 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/796179e08/1677a620063348fa96d199c72bf2452f/FLAG9b347d782 [2021-05-02 17:37:08,893 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:37:08,894 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/eureka_01-2.c [2021-05-02 17:37:08,898 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/796179e08/1677a620063348fa96d199c72bf2452f/FLAG9b347d782 [2021-05-02 17:37:08,913 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/796179e08/1677a620063348fa96d199c72bf2452f [2021-05-02 17:37:08,914 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:37:08,916 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 17:37:08,918 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:37:08,918 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:37:08,921 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:37:08,922 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:37:08" (1/1) ... [2021-05-02 17:37:08,922 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@112879a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:08, skipping insertion in model container [2021-05-02 17:37:08,923 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:37:08" (1/1) ... [2021-05-02 17:37:08,927 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:37:08,941 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:37:09,053 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/eureka_01-2.c[323,336] [2021-05-02 17:37:09,117 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:37:09,132 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:37:09,139 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/eureka_01-2.c[323,336] [2021-05-02 17:37:09,171 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:37:09,182 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:37:09,183 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:37:09 WrapperNode [2021-05-02 17:37:09,183 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:37:09,184 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:37:09,184 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:37:09,184 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:37:09,192 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 17:37:09,192 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 17:37:09,205 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 17:37:09,205 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 17:37:09,220 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 17:37:09,223 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 17:37:09,224 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 17:37:09,225 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:37:09,226 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:37:09,226 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:37:09,226 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:37:09,227 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 17:37:09,280 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:37:09,281 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:37:09,281 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:37:09,281 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:37:09,281 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:37:09,281 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:37:09,281 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:37:09,281 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:37:09,281 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:37:09,282 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:37:09,282 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:37:09,282 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:37:09,282 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:37:09,282 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:37:09,283 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:37:09,283 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:37:09,283 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:37:09,526 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:37:09,527 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-02 17:37:09,528 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:37:09 BoogieIcfgContainer [2021-05-02 17:37:09,528 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:37:09,528 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 17:37:09,528 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 17:37:09,529 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 17:37:09,530 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:37:09" (1/1) ... [2021-05-02 17:37:09,557 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:37:09 BasicIcfg [2021-05-02 17:37:09,557 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 17:37:09,558 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:37:09,558 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:37:09,560 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:37:09,560 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:37:08" (1/4) ... [2021-05-02 17:37:09,561 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@477dc3a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:37:09, skipping insertion in model container [2021-05-02 17:37:09,561 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 17:37:09,561 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@477dc3a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:37:09, skipping insertion in model container [2021-05-02 17:37:09,561 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:37:09" (3/4) ... [2021-05-02 17:37:09,562 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@477dc3a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:37:09, skipping insertion in model container [2021-05-02 17:37:09,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:37:09" (4/4) ... [2021-05-02 17:37:09,562 INFO L111 eAbstractionObserver]: Analyzing ICFG eureka_01-2.cJordan [2021-05-02 17:37:09,568 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:37:09,571 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:37:09,583 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:37:09,600 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:37:09,600 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 17:37:09,600 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 17:37:09,600 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:37:09,600 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:37:09,600 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:37:09,600 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:37:09,601 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:37:09,613 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 28 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 17:37:09,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:37:09,621 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:09,621 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:09,622 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:09,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:09,626 INFO L82 PathProgramCache]: Analyzing trace with hash -1334968457, now seen corresponding path program 1 times [2021-05-02 17:37:09,632 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:09,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2005983867] [2021-05-02 17:37:09,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:09,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:09,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:09,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:09,878 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 17:37:09,880 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:09,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2005983867] [2021-05-02 17:37:09,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2005983867] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:09,881 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:09,881 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:37:09,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148168359] [2021-05-02 17:37:09,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:37:09,884 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:09,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:37:09,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:37:09,896 INFO L87 Difference]: Start difference. First operand has 35 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 28 states have internal predecessors, (42), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 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 17:37:09,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:09,965 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2021-05-02 17:37:09,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:37:09,967 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 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 17 [2021-05-02 17:37:09,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:09,972 INFO L225 Difference]: With dead ends: 35 [2021-05-02 17:37:09,972 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 17:37:09,973 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 43.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:37:09,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 17:37:09,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 17:37:09,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:09,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-05-02 17:37:09,995 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 17 [2021-05-02 17:37:09,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:09,996 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-05-02 17:37:09,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 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 17:37:09,996 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-05-02 17:37:09,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:37:09,996 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:09,996 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:09,997 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:37:09,997 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:09,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:09,997 INFO L82 PathProgramCache]: Analyzing trace with hash 243096698, now seen corresponding path program 1 times [2021-05-02 17:37:09,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:09,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374590025] [2021-05-02 17:37:09,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:10,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:10,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,111 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 17:37:10,111 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:10,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374590025] [2021-05-02 17:37:10,112 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1374590025] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:10,112 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:10,112 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:37:10,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332318002] [2021-05-02 17:37:10,113 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:37:10,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:10,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:37:10,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:37:10,115 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 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 17:37:10,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:10,183 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2021-05-02 17:37:10,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:37:10,184 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 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 17 [2021-05-02 17:37:10,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:10,185 INFO L225 Difference]: With dead ends: 33 [2021-05-02 17:37:10,185 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 17:37:10,186 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.2ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:37:10,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 17:37:10,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2021-05-02 17:37:10,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 25 states have (on average 1.28) internal successors, (32), 25 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:10,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2021-05-02 17:37:10,193 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 17 [2021-05-02 17:37:10,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:10,193 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2021-05-02 17:37:10,193 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 3 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 17:37:10,193 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2021-05-02 17:37:10,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 17:37:10,194 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:10,194 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:10,194 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:37:10,195 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:10,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:10,195 INFO L82 PathProgramCache]: Analyzing trace with hash 717214907, now seen corresponding path program 1 times [2021-05-02 17:37:10,195 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:10,196 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724422768] [2021-05-02 17:37:10,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:10,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:10,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:37:10,291 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:10,294 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724422768] [2021-05-02 17:37:10,294 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724422768] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:10,294 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:10,294 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 17:37:10,295 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152631754] [2021-05-02 17:37:10,295 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 17:37:10,296 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:10,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 17:37:10,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:37:10,296 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 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 17:37:10,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:10,406 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2021-05-02 17:37:10,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:37:10,406 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 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 17:37:10,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:10,408 INFO L225 Difference]: With dead ends: 46 [2021-05-02 17:37:10,408 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 17:37:10,409 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 31.8ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:37:10,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 17:37:10,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 32. [2021-05-02 17:37:10,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:10,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-05-02 17:37:10,416 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 20 [2021-05-02 17:37:10,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:10,417 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-05-02 17:37:10,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 2 states have call successors, (3), 3 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 17:37:10,417 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-05-02 17:37:10,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 17:37:10,418 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:10,418 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:10,418 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 17:37:10,418 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:10,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:10,419 INFO L82 PathProgramCache]: Analyzing trace with hash -1347595944, now seen corresponding path program 1 times [2021-05-02 17:37:10,419 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:10,419 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648259602] [2021-05-02 17:37:10,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:10,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:10,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,492 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 17:37:10,492 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:10,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648259602] [2021-05-02 17:37:10,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [648259602] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:10,493 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:10,493 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 17:37:10,493 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464980301] [2021-05-02 17:37:10,493 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 17:37:10,494 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:10,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 17:37:10,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:37:10,494 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 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 17:37:10,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:10,543 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2021-05-02 17:37:10,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:37:10,544 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 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 23 [2021-05-02 17:37:10,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:10,545 INFO L225 Difference]: With dead ends: 35 [2021-05-02 17:37:10,545 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 17:37:10,545 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 25.2ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:37:10,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 17:37:10,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2021-05-02 17:37:10,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 27 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:10,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-05-02 17:37:10,553 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 23 [2021-05-02 17:37:10,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:10,553 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-05-02 17:37:10,553 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 2 states have call successors, (3), 3 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 17:37:10,553 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-05-02 17:37:10,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 17:37:10,554 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:10,554 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:10,554 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 17:37:10,555 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:10,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:10,555 INFO L82 PathProgramCache]: Analyzing trace with hash -468765620, now seen corresponding path program 1 times [2021-05-02 17:37:10,555 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:10,555 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069137959] [2021-05-02 17:37:10,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:10,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:10,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,608 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 17:37:10,608 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:10,608 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069137959] [2021-05-02 17:37:10,608 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1069137959] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:10,608 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:37:10,608 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 17:37:10,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468386016] [2021-05-02 17:37:10,608 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 17:37:10,609 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:10,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 17:37:10,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:37:10,609 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 3 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 17:37:10,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:10,671 INFO L93 Difference]: Finished difference Result 47 states and 57 transitions. [2021-05-02 17:37:10,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:37:10,671 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 3 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 26 [2021-05-02 17:37:10,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:10,673 INFO L225 Difference]: With dead ends: 47 [2021-05-02 17:37:10,673 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 17:37:10,673 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 21.8ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:37:10,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 17:37:10,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 34. [2021-05-02 17:37:10,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:10,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2021-05-02 17:37:10,678 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 26 [2021-05-02 17:37:10,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:10,679 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2021-05-02 17:37:10,679 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.4) internal successors, (22), 4 states have internal predecessors, (22), 2 states have call successors, (3), 3 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 17:37:10,679 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2021-05-02 17:37:10,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 17:37:10,679 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:10,679 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:10,679 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 17:37:10,679 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:10,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:10,680 INFO L82 PathProgramCache]: Analyzing trace with hash 1132636388, now seen corresponding path program 1 times [2021-05-02 17:37:10,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:10,680 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [292742666] [2021-05-02 17:37:10,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:10,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:10,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,758 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 17:37:10,758 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:10,758 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [292742666] [2021-05-02 17:37:10,759 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [292742666] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:10,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70006863] [2021-05-02 17:37:10,760 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 17:37:10,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:10,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 299 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 17:37:10,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:10,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:10,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:10,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:10,960 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 17:37:10,961 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [70006863] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:10,961 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:10,961 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2021-05-02 17:37:10,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903939042] [2021-05-02 17:37:10,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:37:10,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:10,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:37:10,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:37:10,962 INFO L87 Difference]: Start difference. First operand 34 states and 40 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:11,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:11,022 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-05-02 17:37:11,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:37:11,022 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 17:37:11,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:11,024 INFO L225 Difference]: With dead ends: 39 [2021-05-02 17:37:11,024 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 17:37:11,024 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 51.1ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:37:11,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 17:37:11,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2021-05-02 17:37:11,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 31 states have (on average 1.2580645161290323) internal successors, (39), 31 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:11,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2021-05-02 17:37:11,030 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 29 [2021-05-02 17:37:11,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:11,030 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2021-05-02 17:37:11,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:11,031 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2021-05-02 17:37:11,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 17:37:11,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:11,031 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:11,249 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 17:37:11,249 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:11,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:11,249 INFO L82 PathProgramCache]: Analyzing trace with hash 118867877, now seen corresponding path program 2 times [2021-05-02 17:37:11,250 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:11,250 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349039882] [2021-05-02 17:37:11,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:11,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:11,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:11,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:11,298 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 17:37:11,298 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:11,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349039882] [2021-05-02 17:37:11,298 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349039882] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:11,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249985181] [2021-05-02 17:37:11,298 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 17:37:11,392 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:37:11,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:11,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 17:37:11,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:11,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:11,415 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:11,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:11,450 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 17:37:11,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1249985181] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:37:11,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:37:11,450 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-05-02 17:37:11,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062129191] [2021-05-02 17:37:11,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:37:11,451 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:11,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:37:11,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:37:11,451 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 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 17:37:11,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:11,483 INFO L93 Difference]: Finished difference Result 48 states and 57 transitions. [2021-05-02 17:37:11,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:37:11,484 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 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 32 [2021-05-02 17:37:11,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:11,484 INFO L225 Difference]: With dead ends: 48 [2021-05-02 17:37:11,484 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 17:37:11,484 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 35.7ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:37:11,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 17:37:11,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 37. [2021-05-02 17:37:11,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 31 states have (on average 1.2258064516129032) internal successors, (38), 31 states have internal predecessors, (38), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:11,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-05-02 17:37:11,486 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 32 [2021-05-02 17:37:11,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:11,486 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-05-02 17:37:11,486 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 4 states have internal predecessors, (28), 2 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 17:37:11,487 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-05-02 17:37:11,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 17:37:11,487 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:11,487 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:11,703 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:11,704 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:11,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:11,704 INFO L82 PathProgramCache]: Analyzing trace with hash -1919188412, now seen corresponding path program 1 times [2021-05-02 17:37:11,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:11,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [399510431] [2021-05-02 17:37:11,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:11,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:11,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:11,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:11,786 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 17:37:11,786 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:11,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [399510431] [2021-05-02 17:37:11,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [399510431] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:11,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691092733] [2021-05-02 17:37:11,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 17:37:11,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:11,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:37:11,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:11,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:11,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:11,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:11,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:11,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:11,939 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 17:37:11,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691092733] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:11,939 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:11,939 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2021-05-02 17:37:11,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617825000] [2021-05-02 17:37:11,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:37:11,940 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:11,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:37:11,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:37:11,941 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 9 states, 9 states have (on average 4.111111111111111) internal successors, (37), 8 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:12,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:12,040 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2021-05-02 17:37:12,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:37:12,040 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), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 17:37:12,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:12,041 INFO L225 Difference]: With dead ends: 42 [2021-05-02 17:37:12,041 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 17:37:12,041 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 61.1ms TimeCoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:37:12,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 17:37:12,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-02 17:37:12,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 34 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:12,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-05-02 17:37:12,043 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 32 [2021-05-02 17:37:12,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:12,043 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-05-02 17:37:12,043 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), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:12,043 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-05-02 17:37:12,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 17:37:12,044 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:12,044 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:12,259 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:12,260 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:12,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:12,260 INFO L82 PathProgramCache]: Analyzing trace with hash 1330883812, now seen corresponding path program 2 times [2021-05-02 17:37:12,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:12,260 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [50710934] [2021-05-02 17:37:12,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:12,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:12,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:12,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:12,320 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 17:37:12,320 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:12,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [50710934] [2021-05-02 17:37:12,321 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [50710934] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:12,321 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [263892205] [2021-05-02 17:37:12,321 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 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 17:37:12,384 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:37:12,385 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:12,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 17:37:12,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:12,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:12,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:12,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:12,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:12,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:12,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:12,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:12,490 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 17:37:12,490 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [263892205] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:12,490 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:12,490 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2021-05-02 17:37:12,491 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273645163] [2021-05-02 17:37:12,491 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:37:12,491 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:12,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:37:12,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:37:12,492 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:12,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:12,575 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2021-05-02 17:37:12,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:37:12,575 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 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 17:37:12,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:12,576 INFO L225 Difference]: With dead ends: 45 [2021-05-02 17:37:12,576 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 17:37:12,576 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 55.5ms TimeCoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:37:12,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 17:37:12,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-05-02 17:37:12,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 37 states have (on average 1.1891891891891893) internal successors, (44), 37 states have internal predecessors, (44), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:12,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2021-05-02 17:37:12,578 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 35 [2021-05-02 17:37:12,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:12,578 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2021-05-02 17:37:12,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.909090909090909) internal successors, (43), 10 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:12,578 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2021-05-02 17:37:12,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 17:37:12,579 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:12,579 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:12,790 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:12,790 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:12,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:12,791 INFO L82 PathProgramCache]: Analyzing trace with hash -1510212028, now seen corresponding path program 3 times [2021-05-02 17:37:12,791 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:12,791 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [407626886] [2021-05-02 17:37:12,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:12,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:12,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:12,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:12,867 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 17:37:12,868 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:12,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [407626886] [2021-05-02 17:37:12,868 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [407626886] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:12,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2057911948] [2021-05-02 17:37:12,868 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 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 17:37:12,933 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 17:37:12,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:12,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 17:37:12,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:12,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:12,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:12,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:13,003 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 17:37:13,003 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2057911948] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:13,004 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:13,004 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2021-05-02 17:37:13,004 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1633051532] [2021-05-02 17:37:13,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:37:13,004 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:13,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:37:13,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=67, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:37:13,005 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand has 11 states, 11 states have (on average 4.454545454545454) internal successors, (49), 10 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:13,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:13,178 INFO L93 Difference]: Finished difference Result 105 states and 127 transitions. [2021-05-02 17:37:13,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:37:13,179 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.454545454545454) internal successors, (49), 10 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 17:37:13,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:13,180 INFO L225 Difference]: With dead ends: 105 [2021-05-02 17:37:13,180 INFO L226 Difference]: Without dead ends: 105 [2021-05-02 17:37:13,180 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 81.7ms TimeCoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:37:13,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-02 17:37:13,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 70. [2021-05-02 17:37:13,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 64 states have (on average 1.234375) internal successors, (79), 64 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:13,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 84 transitions. [2021-05-02 17:37:13,183 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 84 transitions. Word has length 38 [2021-05-02 17:37:13,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:13,184 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 84 transitions. [2021-05-02 17:37:13,184 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 4.454545454545454) internal successors, (49), 10 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:13,184 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 84 transitions. [2021-05-02 17:37:13,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 17:37:13,184 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:13,184 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:13,390 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:37:13,390 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:13,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:13,391 INFO L82 PathProgramCache]: Analyzing trace with hash -2144939104, now seen corresponding path program 4 times [2021-05-02 17:37:13,391 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:13,391 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514572000] [2021-05-02 17:37:13,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:13,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:13,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:13,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:13,460 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 29 proven. 1 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-05-02 17:37:13,460 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:13,460 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514572000] [2021-05-02 17:37:13,460 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514572000] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:13,460 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084068555] [2021-05-02 17:37:13,460 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 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 17:37:13,611 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:37:13,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:13,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 17:37:13,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:13,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:13,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:13,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:13,733 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 29 proven. 1 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-05-02 17:37:13,733 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1084068555] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:13,734 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:13,734 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2021-05-02 17:37:13,735 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231007496] [2021-05-02 17:37:13,736 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:37:13,736 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:13,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:37:13,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:37:13,736 INFO L87 Difference]: Start difference. First operand 70 states and 84 transitions. Second operand has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:13,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:13,794 INFO L93 Difference]: Finished difference Result 95 states and 119 transitions. [2021-05-02 17:37:13,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:37:13,795 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 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 17:37:13,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:13,796 INFO L225 Difference]: With dead ends: 95 [2021-05-02 17:37:13,796 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 17:37:13,796 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 64.9ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:37:13,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 17:37:13,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 85. [2021-05-02 17:37:13,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 79 states have (on average 1.2531645569620253) internal successors, (99), 79 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:13,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 104 transitions. [2021-05-02 17:37:13,804 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 104 transitions. Word has length 65 [2021-05-02 17:37:13,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:13,804 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 104 transitions. [2021-05-02 17:37:13,804 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.888888888888889) internal successors, (44), 8 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:13,804 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 104 transitions. [2021-05-02 17:37:13,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 17:37:13,808 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:13,808 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 10, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:14,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:14,021 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:14,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:14,021 INFO L82 PathProgramCache]: Analyzing trace with hash 1305892376, now seen corresponding path program 5 times [2021-05-02 17:37:14,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:14,021 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563236748] [2021-05-02 17:37:14,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:14,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:14,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:14,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:14,116 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 73 proven. 5 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2021-05-02 17:37:14,116 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:14,116 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563236748] [2021-05-02 17:37:14,116 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563236748] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:14,116 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1074230124] [2021-05-02 17:37:14,117 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 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 17:37:16,629 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-02 17:37:16,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:16,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 478 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:37:16,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:16,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:16,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:16,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:16,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:16,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:16,780 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 131 proven. 5 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-05-02 17:37:16,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1074230124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:16,780 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:16,780 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2021-05-02 17:37:16,780 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283563453] [2021-05-02 17:37:16,781 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:37:16,781 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:16,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:37:16,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:37:16,781 INFO L87 Difference]: Start difference. First operand 85 states and 104 transitions. Second operand has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:16,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:16,846 INFO L93 Difference]: Finished difference Result 110 states and 139 transitions. [2021-05-02 17:37:16,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:37:16,846 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 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 17:37:16,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:16,847 INFO L225 Difference]: With dead ends: 110 [2021-05-02 17:37:16,847 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 17:37:16,847 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 54.0ms TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:37:16,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 17:37:16,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 100. [2021-05-02 17:37:16,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 94 states have (on average 1.2659574468085106) internal successors, (119), 94 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:16,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 124 transitions. [2021-05-02 17:37:16,860 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 124 transitions. Word has length 80 [2021-05-02 17:37:16,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:16,860 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 124 transitions. [2021-05-02 17:37:16,860 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 5.090909090909091) internal successors, (56), 10 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:16,860 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 124 transitions. [2021-05-02 17:37:16,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 17:37:16,861 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:16,861 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 15, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:17,061 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:17,062 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:17,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:17,062 INFO L82 PathProgramCache]: Analyzing trace with hash -1392302944, now seen corresponding path program 6 times [2021-05-02 17:37:17,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:17,062 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1300676923] [2021-05-02 17:37:17,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:17,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:17,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:17,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:17,185 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 141 proven. 12 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-05-02 17:37:17,185 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:17,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1300676923] [2021-05-02 17:37:17,185 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1300676923] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:17,185 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804039084] [2021-05-02 17:37:17,185 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 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 17:37:17,264 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-02 17:37:17,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:17,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 17:37:17,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:17,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:17,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:17,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:17,391 INFO L134 CoverageAnalysis]: Checked inductivity of 461 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 460 trivial. 0 not checked. [2021-05-02 17:37:17,391 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804039084] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:17,391 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:17,391 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2021-05-02 17:37:17,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392052418] [2021-05-02 17:37:17,392 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:37:17,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:17,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:37:17,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:37:17,392 INFO L87 Difference]: Start difference. First operand 100 states and 124 transitions. Second operand has 11 states, 11 states have (on average 5.181818181818182) internal successors, (57), 10 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:17,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:17,636 INFO L93 Difference]: Finished difference Result 138 states and 174 transitions. [2021-05-02 17:37:17,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 17:37:17,636 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 5.181818181818182) internal successors, (57), 10 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-02 17:37:17,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:17,637 INFO L225 Difference]: With dead ends: 138 [2021-05-02 17:37:17,637 INFO L226 Difference]: Without dead ends: 138 [2021-05-02 17:37:17,637 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 154.1ms TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2021-05-02 17:37:17,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-02 17:37:17,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 118. [2021-05-02 17:37:17,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 112 states have (on average 1.2678571428571428) internal successors, (142), 112 states have internal predecessors, (142), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:17,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 147 transitions. [2021-05-02 17:37:17,640 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 147 transitions. Word has length 95 [2021-05-02 17:37:17,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:17,640 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 147 transitions. [2021-05-02 17:37:17,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 5.181818181818182) internal successors, (57), 10 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:17,641 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 147 transitions. [2021-05-02 17:37:17,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 17:37:17,641 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:17,641 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 20, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:17,841 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 17:37:17,844 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:17,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:17,844 INFO L82 PathProgramCache]: Analyzing trace with hash -2023625832, now seen corresponding path program 7 times [2021-05-02 17:37:17,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:17,844 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568038172] [2021-05-02 17:37:17,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:17,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:17,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:17,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:17,942 INFO L134 CoverageAnalysis]: Checked inductivity of 745 backedges. 233 proven. 22 refuted. 0 times theorem prover too weak. 490 trivial. 0 not checked. [2021-05-02 17:37:17,942 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:17,942 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568038172] [2021-05-02 17:37:17,942 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [568038172] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:17,942 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2015006698] [2021-05-02 17:37:17,942 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 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 17:37:18,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:18,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 642 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 17:37:18,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:18,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,246 INFO L134 CoverageAnalysis]: Checked inductivity of 745 backedges. 233 proven. 22 refuted. 0 times theorem prover too weak. 490 trivial. 0 not checked. [2021-05-02 17:37:18,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2015006698] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:18,246 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:18,246 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 15 [2021-05-02 17:37:18,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414792096] [2021-05-02 17:37:18,247 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 17:37:18,247 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:18,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 17:37:18,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=132, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:37:18,247 INFO L87 Difference]: Start difference. First operand 118 states and 147 transitions. Second operand has 15 states, 15 states have (on average 4.133333333333334) internal successors, (62), 14 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:18,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:18,354 INFO L93 Difference]: Finished difference Result 143 states and 182 transitions. [2021-05-02 17:37:18,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:37:18,355 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.133333333333334) internal successors, (62), 14 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-05-02 17:37:18,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:18,355 INFO L225 Difference]: With dead ends: 143 [2021-05-02 17:37:18,355 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 17:37:18,355 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 83.5ms TimeCoverageRelationStatistics Valid=78, Invalid=132, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:37:18,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 17:37:18,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 133. [2021-05-02 17:37:18,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 127 states have (on average 1.2755905511811023) internal successors, (162), 127 states have internal predecessors, (162), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:18,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 167 transitions. [2021-05-02 17:37:18,358 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 167 transitions. Word has length 113 [2021-05-02 17:37:18,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:18,359 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 167 transitions. [2021-05-02 17:37:18,359 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 4.133333333333334) internal successors, (62), 14 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:18,359 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 167 transitions. [2021-05-02 17:37:18,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-02 17:37:18,359 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:18,359 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 25, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:18,577 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:37:18,577 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:18,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:18,577 INFO L82 PathProgramCache]: Analyzing trace with hash 481392400, now seen corresponding path program 8 times [2021-05-02 17:37:18,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:18,578 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341951381] [2021-05-02 17:37:18,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:18,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:18,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:18,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:18,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1100 backedges. 349 proven. 35 refuted. 0 times theorem prover too weak. 716 trivial. 0 not checked. [2021-05-02 17:37:18,684 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:18,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341951381] [2021-05-02 17:37:18,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341951381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:18,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891080917] [2021-05-02 17:37:18,684 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 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 17:37:18,811 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:37:18,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:18,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 17:37:18,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:18,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:18,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,022 INFO L134 CoverageAnalysis]: Checked inductivity of 1100 backedges. 349 proven. 35 refuted. 0 times theorem prover too weak. 716 trivial. 0 not checked. [2021-05-02 17:37:19,022 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [891080917] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:19,022 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:19,022 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2021-05-02 17:37:19,023 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976953824] [2021-05-02 17:37:19,023 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 17:37:19,023 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:19,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 17:37:19,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=171, Unknown=0, NotChecked=0, Total=272 [2021-05-02 17:37:19,023 INFO L87 Difference]: Start difference. First operand 133 states and 167 transitions. Second operand has 17 states, 17 states have (on average 4.0) internal successors, (68), 16 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:19,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:19,096 INFO L93 Difference]: Finished difference Result 158 states and 202 transitions. [2021-05-02 17:37:19,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:37:19,097 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.0) internal successors, (68), 16 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 128 [2021-05-02 17:37:19,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:19,097 INFO L225 Difference]: With dead ends: 158 [2021-05-02 17:37:19,097 INFO L226 Difference]: Without dead ends: 158 [2021-05-02 17:37:19,097 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 93.8ms TimeCoverageRelationStatistics Valid=101, Invalid=171, Unknown=0, NotChecked=0, Total=272 [2021-05-02 17:37:19,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-05-02 17:37:19,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 148. [2021-05-02 17:37:19,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 142 states have (on average 1.2816901408450705) internal successors, (182), 142 states have internal predecessors, (182), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:19,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 187 transitions. [2021-05-02 17:37:19,100 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 187 transitions. Word has length 128 [2021-05-02 17:37:19,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:19,100 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 187 transitions. [2021-05-02 17:37:19,100 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 4.0) internal successors, (68), 16 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:19,100 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 187 transitions. [2021-05-02 17:37:19,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-02 17:37:19,101 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:19,101 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 30, 5, 5, 5, 5, 5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:19,308 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 17:37:19,309 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:19,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:19,309 INFO L82 PathProgramCache]: Analyzing trace with hash -558812264, now seen corresponding path program 9 times [2021-05-02 17:37:19,309 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:19,309 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796520297] [2021-05-02 17:37:19,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:19,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:19,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:19,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:19,426 INFO L134 CoverageAnalysis]: Checked inductivity of 1530 backedges. 489 proven. 51 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2021-05-02 17:37:19,426 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:19,426 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796520297] [2021-05-02 17:37:19,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [796520297] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:19,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347310978] [2021-05-02 17:37:19,427 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 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 17:37:19,523 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 17:37:19,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:19,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 318 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:37:19,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:19,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:19,723 INFO L134 CoverageAnalysis]: Checked inductivity of 1530 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1525 trivial. 0 not checked. [2021-05-02 17:37:19,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1347310978] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:19,723 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:19,724 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 15 [2021-05-02 17:37:19,724 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382244424] [2021-05-02 17:37:19,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 17:37:19,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:19,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 17:37:19,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=141, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:37:19,725 INFO L87 Difference]: Start difference. First operand 148 states and 187 transitions. Second operand has 15 states, 15 states have (on average 4.6) internal successors, (69), 14 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:20,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:20,249 INFO L93 Difference]: Finished difference Result 190 states and 242 transitions. [2021-05-02 17:37:20,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 17:37:20,250 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 4.6) internal successors, (69), 14 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 143 [2021-05-02 17:37:20,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:20,250 INFO L225 Difference]: With dead ends: 190 [2021-05-02 17:37:20,250 INFO L226 Difference]: Without dead ends: 190 [2021-05-02 17:37:20,251 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 390.7ms TimeCoverageRelationStatistics Valid=489, Invalid=993, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 17:37:20,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-05-02 17:37:20,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 166. [2021-05-02 17:37:20,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 160 states have (on average 1.28125) internal successors, (205), 160 states have internal predecessors, (205), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:20,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 210 transitions. [2021-05-02 17:37:20,254 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 210 transitions. Word has length 143 [2021-05-02 17:37:20,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:20,255 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 210 transitions. [2021-05-02 17:37:20,255 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 4.6) internal successors, (69), 14 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:20,255 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 210 transitions. [2021-05-02 17:37:20,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-02 17:37:20,256 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:20,256 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 35, 5, 5, 5, 5, 5, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:20,456 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 17:37:20,457 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:20,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:20,457 INFO L82 PathProgramCache]: Analyzing trace with hash -1943744352, now seen corresponding path program 10 times [2021-05-02 17:37:20,457 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:20,457 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311063460] [2021-05-02 17:37:20,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:20,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:20,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:20,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:20,612 INFO L134 CoverageAnalysis]: Checked inductivity of 2042 backedges. 653 proven. 70 refuted. 0 times theorem prover too weak. 1319 trivial. 0 not checked. [2021-05-02 17:37:20,612 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:20,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311063460] [2021-05-02 17:37:20,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311063460] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:20,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895554140] [2021-05-02 17:37:20,612 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 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 17:37:20,741 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:37:20,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:37:20,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 696 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 17:37:20,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:37:20,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,818 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:20,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:21,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:21,006 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:21,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:37:21,024 INFO L134 CoverageAnalysis]: Checked inductivity of 2042 backedges. 56 proven. 591 refuted. 0 times theorem prover too weak. 1395 trivial. 0 not checked. [2021-05-02 17:37:21,025 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895554140] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:21,025 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:37:21,025 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14] total 24 [2021-05-02 17:37:21,025 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898834590] [2021-05-02 17:37:21,025 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 17:37:21,025 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:37:21,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 17:37:21,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=430, Unknown=0, NotChecked=0, Total=552 [2021-05-02 17:37:21,026 INFO L87 Difference]: Start difference. First operand 166 states and 210 transitions. Second operand has 24 states, 24 states have (on average 3.9583333333333335) internal successors, (95), 23 states have internal predecessors, (95), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:22,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:37:22,090 INFO L93 Difference]: Finished difference Result 212 states and 270 transitions. [2021-05-02 17:37:22,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 17:37:22,091 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.9583333333333335) internal successors, (95), 23 states have internal predecessors, (95), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 161 [2021-05-02 17:37:22,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:37:22,091 INFO L225 Difference]: With dead ends: 212 [2021-05-02 17:37:22,091 INFO L226 Difference]: Without dead ends: 212 [2021-05-02 17:37:22,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1429 ImplicationChecksByTransitivity, 786.2ms TimeCoverageRelationStatistics Valid=1022, Invalid=4090, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 17:37:22,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-02 17:37:22,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 184. [2021-05-02 17:37:22,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 178 states have (on average 1.2808988764044944) internal successors, (228), 178 states have internal predecessors, (228), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 17:37:22,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 233 transitions. [2021-05-02 17:37:22,096 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 233 transitions. Word has length 161 [2021-05-02 17:37:22,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:37:22,096 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 233 transitions. [2021-05-02 17:37:22,096 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.9583333333333335) internal successors, (95), 23 states have internal predecessors, (95), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:37:22,096 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 233 transitions. [2021-05-02 17:37:22,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-02 17:37:22,097 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:37:22,097 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 40, 5, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:37:22,316 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 17:37:22,317 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:37:22,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:37:22,317 INFO L82 PathProgramCache]: Analyzing trace with hash -1537774696, now seen corresponding path program 11 times [2021-05-02 17:37:22,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:37:22,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733793782] [2021-05-02 17:37:22,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:37:22,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:22,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:37:22,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:37:22,499 INFO L134 CoverageAnalysis]: Checked inductivity of 2632 backedges. 841 proven. 92 refuted. 0 times theorem prover too weak. 1699 trivial. 0 not checked. [2021-05-02 17:37:22,499 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:37:22,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1733793782] [2021-05-02 17:37:22,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1733793782] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:37:22,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144213314] [2021-05-02 17:37:22,499 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 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