/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-crafted-1/Mono5_1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 18:24:36,587 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 18:24:36,588 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 18:24:36,619 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 18:24:36,640 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 18:24:36,641 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 18:24:36,643 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 18:24:36,644 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 18:24:36,645 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 18:24:36,645 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 18:24:36,649 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 18:24:36,653 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 18:24:36,655 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 18:24:36,666 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 18:24:36,667 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 18:24:36,669 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 18:24:36,674 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 18:24:36,681 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 18:24:36,684 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 18:24:36,685 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 18:24:36,686 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 18:24:36,721 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 18:24:36,721 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 18:24:36,724 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 18:24:36,724 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 18:24:36,724 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 18:24:36,724 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 18:24:36,724 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 18:24:36,725 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 18:24:36,725 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 18:24:36,725 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 18:24:36,726 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 18:24:36,726 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 18:24:36,726 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 18:24:36,726 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 18:24:36,726 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 18:24:36,726 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 18:24:36,726 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 18:24:36,727 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 18:24:36,727 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 18:24:36,727 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 18:24:36,727 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 18:24:36,728 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 18:24:36,728 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 18:24:37,098 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 18:24:37,126 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 18:24:37,128 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 18:24:37,128 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 18:24:37,131 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 18:24:37,132 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono5_1.c [2021-05-02 18:24:37,189 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/39ba40a21/8e4ded8464de4d1c9623c9acc97429bd/FLAG55b7ccd57 [2021-05-02 18:24:37,939 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 18:24:37,940 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono5_1.c [2021-05-02 18:24:37,944 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/39ba40a21/8e4ded8464de4d1c9623c9acc97429bd/FLAG55b7ccd57 [2021-05-02 18:24:38,217 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/39ba40a21/8e4ded8464de4d1c9623c9acc97429bd [2021-05-02 18:24:38,220 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 18:24:38,221 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 18:24:38,225 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 18:24:38,225 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 18:24:38,228 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 18:24:38,229 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:24:38" (1/1) ... [2021-05-02 18:24:38,229 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3eeef9cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:24:38, skipping insertion in model container [2021-05-02 18:24:38,229 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 06:24:38" (1/1) ... [2021-05-02 18:24:38,235 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 18:24:38,245 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 18:24:38,357 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-crafted-1/Mono5_1.c[311,324] [2021-05-02 18:24:38,366 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:24:38,374 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 18:24:38,383 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-crafted-1/Mono5_1.c[311,324] [2021-05-02 18:24:38,385 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 18:24:38,396 INFO L208 MainTranslator]: Completed translation [2021-05-02 18:24:38,397 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:24:38 WrapperNode [2021-05-02 18:24:38,397 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 18:24:38,399 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 18:24:38,399 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 18:24:38,399 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 18:24:38,408 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:24:38" (1/1) ... [2021-05-02 18:24:38,408 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:24:38" (1/1) ... [2021-05-02 18:24:38,413 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:24:38" (1/1) ... [2021-05-02 18:24:38,413 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:24:38" (1/1) ... [2021-05-02 18:24:38,417 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:24:38" (1/1) ... [2021-05-02 18:24:38,455 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:24:38" (1/1) ... [2021-05-02 18:24:38,455 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:24:38" (1/1) ... [2021-05-02 18:24:38,456 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 18:24:38,457 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 18:24:38,457 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 18:24:38,457 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 18:24:38,458 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:24:38" (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 18:24:38,556 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 18:24:38,557 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 18:24:38,557 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 18:24:38,557 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 18:24:38,557 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 18:24:38,557 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 18:24:38,557 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 18:24:38,558 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 18:24:38,558 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 18:24:38,558 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 18:24:38,558 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 18:24:38,558 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 18:24:38,558 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 18:24:38,559 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 18:24:38,559 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 18:24:38,560 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 18:24:38,560 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 18:24:38,701 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 18:24:38,701 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 18:24:38,702 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:24:38 BoogieIcfgContainer [2021-05-02 18:24:38,702 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 18:24:38,703 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 18:24:38,703 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 18:24:38,703 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 18:24:38,705 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:24:38" (1/1) ... [2021-05-02 18:24:38,718 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:24:38 BasicIcfg [2021-05-02 18:24:38,718 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 18:24:38,719 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 18:24:38,719 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 18:24:38,722 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 18:24:38,722 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 06:24:38" (1/4) ... [2021-05-02 18:24:38,722 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43053e59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:24:38, skipping insertion in model container [2021-05-02 18:24:38,722 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 06:24:38" (2/4) ... [2021-05-02 18:24:38,723 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43053e59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 06:24:38, skipping insertion in model container [2021-05-02 18:24:38,723 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 06:24:38" (3/4) ... [2021-05-02 18:24:38,723 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43053e59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:24:38, skipping insertion in model container [2021-05-02 18:24:38,723 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 06:24:38" (4/4) ... [2021-05-02 18:24:38,724 INFO L111 eAbstractionObserver]: Analyzing ICFG Mono5_1.cJordan [2021-05-02 18:24:38,728 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 18:24:38,731 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 18:24:38,744 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 18:24:38,757 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 18:24:38,757 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 18:24:38,757 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 18:24:38,757 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 18:24:38,757 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 18:24:38,758 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 18:24:38,758 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 18:24:38,758 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 18:24:38,767 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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 18:24:38,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:24:38,772 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:38,773 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:38,773 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:38,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:38,777 INFO L82 PathProgramCache]: Analyzing trace with hash -154368955, now seen corresponding path program 1 times [2021-05-02 18:24:38,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:38,783 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018460184] [2021-05-02 18:24:38,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:38,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:38,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:38,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:38,925 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 18:24:38,925 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:38,925 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018460184] [2021-05-02 18:24:38,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1018460184] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:24:38,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:24:38,926 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 18:24:38,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418286539] [2021-05-02 18:24:38,930 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 18:24:38,930 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:38,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 18:24:38,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:24:38,940 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 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 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 18:24:38,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:38,971 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-05-02 18:24:38,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 18:24:38,972 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11 [2021-05-02 18:24:38,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:38,977 INFO L225 Difference]: With dead ends: 20 [2021-05-02 18:24:38,977 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 18:24:38,978 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 18:24:38,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 18:24:38,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 18:24:38,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 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 18:24:38,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 18:24:38,998 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 18:24:38,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:38,999 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 18:24:38,999 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 18:24:38,999 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 18:24:39,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 18:24:39,000 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:39,000 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:39,000 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 18:24:39,000 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:39,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:39,001 INFO L82 PathProgramCache]: Analyzing trace with hash -153445434, now seen corresponding path program 1 times [2021-05-02 18:24:39,001 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:39,002 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209068547] [2021-05-02 18:24:39,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:39,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:39,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:39,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:39,125 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 18:24:39,126 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:39,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209068547] [2021-05-02 18:24:39,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1209068547] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:24:39,126 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:24:39,126 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 18:24:39,126 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847162320] [2021-05-02 18:24:39,127 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:24:39,128 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:39,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:24:39,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:24:39,129 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 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 18:24:39,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:39,252 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2021-05-02 18:24:39,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:24:39,252 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 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 11 [2021-05-02 18:24:39,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:39,253 INFO L225 Difference]: With dead ends: 20 [2021-05-02 18:24:39,253 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 18:24:39,254 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 123.9ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:24:39,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 18:24:39,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 18:24:39,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 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 18:24:39,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-02 18:24:39,256 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2021-05-02 18:24:39,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:39,257 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-02 18:24:39,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 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 18:24:39,257 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-02 18:24:39,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 18:24:39,257 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:39,257 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:39,257 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 18:24:39,258 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:39,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:39,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1203653974, now seen corresponding path program 1 times [2021-05-02 18:24:39,258 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:39,258 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432991900] [2021-05-02 18:24:39,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:39,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:39,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:39,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:39,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:39,337 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:39,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432991900] [2021-05-02 18:24:39,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432991900] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 18:24:39,337 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 18:24:39,337 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 18:24:39,337 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842019313] [2021-05-02 18:24:39,338 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 18:24:39,338 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:39,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 18:24:39,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 18:24:39,339 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 18:24:39,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:39,378 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2021-05-02 18:24:39,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 18:24:39,379 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 14 [2021-05-02 18:24:39,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:39,379 INFO L225 Difference]: With dead ends: 20 [2021-05-02 18:24:39,379 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 18:24:39,379 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 37.7ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 18:24:39,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 18:24:39,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 18:24:39,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 3 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 18:24:39,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2021-05-02 18:24:39,382 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2021-05-02 18:24:39,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:39,382 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2021-05-02 18:24:39,382 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 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 18:24:39,382 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2021-05-02 18:24:39,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 18:24:39,383 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:39,383 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:39,383 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 18:24:39,383 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:39,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:39,384 INFO L82 PathProgramCache]: Analyzing trace with hash 1828446949, now seen corresponding path program 1 times [2021-05-02 18:24:39,384 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:39,384 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989421043] [2021-05-02 18:24:39,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:39,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:39,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:39,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:39,452 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:39,452 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:39,453 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989421043] [2021-05-02 18:24:39,453 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989421043] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:39,453 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538948031] [2021-05-02 18:24:39,453 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 18:24:39,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:39,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 18:24:39,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:39,641 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:39,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538948031] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:39,642 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:39,642 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 18:24:39,642 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161856630] [2021-05-02 18:24:39,644 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 18:24:39,644 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:39,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 18:24:39,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 18:24:39,648 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 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 18:24:39,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:39,761 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2021-05-02 18:24:39,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 18:24:39,762 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 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 17 [2021-05-02 18:24:39,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:39,763 INFO L225 Difference]: With dead ends: 23 [2021-05-02 18:24:39,763 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 18:24:39,763 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 91.2ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 18:24:39,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 18:24:39,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 18:24:39,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 3 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 18:24:39,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-05-02 18:24:39,766 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2021-05-02 18:24:39,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:39,767 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-05-02 18:24:39,767 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.8333333333333335) internal successors, (17), 5 states have internal predecessors, (17), 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 18:24:39,767 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-05-02 18:24:39,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 18:24:39,768 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:39,768 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:39,983 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:39,983 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:39,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:39,984 INFO L82 PathProgramCache]: Analyzing trace with hash 647704310, now seen corresponding path program 2 times [2021-05-02 18:24:39,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:39,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1015444280] [2021-05-02 18:24:39,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:39,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:40,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:40,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:40,056 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:40,056 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:40,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1015444280] [2021-05-02 18:24:40,056 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1015444280] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:40,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [24506054] [2021-05-02 18:24:40,057 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 18:24:40,090 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:24:40,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:40,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 18:24:40,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:40,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:40,154 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:40,154 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [24506054] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:40,154 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:40,154 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 18:24:40,155 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765717626] [2021-05-02 18:24:40,155 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 18:24:40,155 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:40,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 18:24:40,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 18:24:40,156 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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 18:24:40,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:40,270 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-05-02 18:24:40,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 18:24:40,271 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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 20 [2021-05-02 18:24:40,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:40,271 INFO L225 Difference]: With dead ends: 26 [2021-05-02 18:24:40,271 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 18:24:40,272 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 113.3ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 18:24:40,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 18:24:40,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-02 18:24:40,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 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 18:24:40,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-02 18:24:40,274 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 20 [2021-05-02 18:24:40,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:40,274 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-02 18:24:40,274 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 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 18:24:40,274 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-02 18:24:40,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 18:24:40,275 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:40,275 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:40,489 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:40,490 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:40,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:40,490 INFO L82 PathProgramCache]: Analyzing trace with hash 925900101, now seen corresponding path program 3 times [2021-05-02 18:24:40,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:40,491 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [750894148] [2021-05-02 18:24:40,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:40,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:40,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:40,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:40,565 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:40,565 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:40,565 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [750894148] [2021-05-02 18:24:40,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [750894148] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:40,566 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1327320350] [2021-05-02 18:24:40,566 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 18:24:40,628 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 18:24:40,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:40,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 18:24:40,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:40,714 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:24:40,714 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1327320350] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:40,714 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:40,715 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2021-05-02 18:24:40,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387165705] [2021-05-02 18:24:40,715 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:24:40,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:40,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:24:40,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:24:40,716 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:41,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:41,021 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2021-05-02 18:24:41,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 18:24:41,021 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 3 states have call successors, (5), 4 states have call predecessors, (5), 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 18:24:41,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:41,022 INFO L225 Difference]: With dead ends: 35 [2021-05-02 18:24:41,022 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 18:24:41,022 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 288.0ms TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:24:41,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 18:24:41,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-02 18:24:41,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 26 states have internal predecessors, (30), 3 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 18:24:41,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2021-05-02 18:24:41,025 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 23 [2021-05-02 18:24:41,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:41,025 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2021-05-02 18:24:41,025 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 9 states have internal predecessors, (29), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:41,025 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2021-05-02 18:24:41,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 18:24:41,026 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:41,026 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:41,247 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:41,247 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:41,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:41,247 INFO L82 PathProgramCache]: Analyzing trace with hash -1780638074, now seen corresponding path program 4 times [2021-05-02 18:24:41,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:41,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571918551] [2021-05-02 18:24:41,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:41,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:41,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:41,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:41,351 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:24:41,351 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:41,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [571918551] [2021-05-02 18:24:41,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [571918551] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:41,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1311000614] [2021-05-02 18:24:41,352 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:41,388 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:24:41,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:41,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 18:24:41,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:41,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:41,461 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 26 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:24:41,461 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1311000614] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:41,461 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:41,461 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 18:24:41,461 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841813424] [2021-05-02 18:24:41,462 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 18:24:41,462 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:41,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 18:24:41,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 18:24:41,462 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 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 18:24:41,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:41,636 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2021-05-02 18:24:41,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 18:24:41,637 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 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 18:24:41,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:41,637 INFO L225 Difference]: With dead ends: 35 [2021-05-02 18:24:41,637 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 18:24:41,638 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 174.1ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:24:41,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 18:24:41,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 18:24:41,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 29 states have internal predecessors, (33), 3 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 18:24:41,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-02 18:24:41,640 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 29 [2021-05-02 18:24:41,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:41,640 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-02 18:24:41,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.111111111111111) internal successors, (28), 8 states have internal predecessors, (28), 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 18:24:41,640 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-02 18:24:41,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 18:24:41,641 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:41,641 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:41,856 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:41,857 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:41,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:41,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1784784617, now seen corresponding path program 5 times [2021-05-02 18:24:41,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:41,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1660947086] [2021-05-02 18:24:41,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:41,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:41,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:41,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:41,989 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 28 proven. 40 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:24:41,989 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:41,989 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1660947086] [2021-05-02 18:24:41,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1660947086] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:41,990 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186779277] [2021-05-02 18:24:41,990 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:42,131 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 18:24:42,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:42,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 18:24:42,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:42,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:42,277 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:24:42,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1186779277] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:42,277 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:42,277 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 11 [2021-05-02 18:24:42,277 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768147826] [2021-05-02 18:24:42,277 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 18:24:42,278 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:42,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 18:24:42,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 18:24:42,278 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 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 18:24:42,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:42,546 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2021-05-02 18:24:42,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 18:24:42,546 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 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 18:24:42,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:42,547 INFO L225 Difference]: With dead ends: 41 [2021-05-02 18:24:42,547 INFO L226 Difference]: Without dead ends: 41 [2021-05-02 18:24:42,547 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 28 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 255.0ms TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-02 18:24:42,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-05-02 18:24:42,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2021-05-02 18:24:42,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 35 states have internal predecessors, (39), 3 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 18:24:42,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-05-02 18:24:42,550 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 32 [2021-05-02 18:24:42,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:42,550 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-05-02 18:24:42,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 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 18:24:42,551 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-05-02 18:24:42,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 18:24:42,551 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:42,551 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:42,757 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:42,757 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:42,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:42,758 INFO L82 PathProgramCache]: Analyzing trace with hash 1071780535, now seen corresponding path program 6 times [2021-05-02 18:24:42,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:42,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605504519] [2021-05-02 18:24:42,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:42,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:42,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:42,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:42,894 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 18:24:42,895 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:42,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605504519] [2021-05-02 18:24:42,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605504519] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:42,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170649814] [2021-05-02 18:24:42,895 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:42,950 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 18:24:42,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:42,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 18:24:42,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:43,083 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:24:43,083 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170649814] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:43,084 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:43,084 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 16 [2021-05-02 18:24:43,084 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428269951] [2021-05-02 18:24:43,084 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 18:24:43,084 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:43,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 18:24:43,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:24:43,085 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:43,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:43,657 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2021-05-02 18:24:43,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 18:24:43,659 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 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 18:24:43,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:43,660 INFO L225 Difference]: With dead ends: 50 [2021-05-02 18:24:43,660 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 18:24:43,661 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 461.1ms TimeCoverageRelationStatistics Valid=120, Invalid=692, Unknown=0, NotChecked=0, Total=812 [2021-05-02 18:24:43,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 18:24:43,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-05-02 18:24:43,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.1219512195121952) internal successors, (46), 41 states have internal predecessors, (46), 3 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 18:24:43,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2021-05-02 18:24:43,680 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2021-05-02 18:24:43,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:43,681 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2021-05-02 18:24:43,682 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 14 states have internal predecessors, (46), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:43,682 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2021-05-02 18:24:43,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 18:24:43,684 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:43,684 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:43,896 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:43,897 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:43,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:43,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1847135702, now seen corresponding path program 7 times [2021-05-02 18:24:43,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:43,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216954806] [2021-05-02 18:24:43,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:43,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:44,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:44,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:44,152 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:24:44,152 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:44,153 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216954806] [2021-05-02 18:24:44,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216954806] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:44,153 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274461999] [2021-05-02 18:24:44,153 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:44,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:44,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 18:24:44,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:44,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:44,293 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 69 proven. 100 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:24:44,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [274461999] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:44,293 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:44,294 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 18:24:44,294 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671580424] [2021-05-02 18:24:44,294 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 18:24:44,294 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:44,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 18:24:44,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 18:24:44,295 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 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 18:24:44,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:44,632 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2021-05-02 18:24:44,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 18:24:44,637 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 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 44 [2021-05-02 18:24:44,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:44,638 INFO L225 Difference]: With dead ends: 50 [2021-05-02 18:24:44,638 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 18:24:44,638 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 315.6ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:24:44,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 18:24:44,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-02 18:24:44,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.1136363636363635) internal successors, (49), 44 states have internal predecessors, (49), 3 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 18:24:44,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2021-05-02 18:24:44,641 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 44 [2021-05-02 18:24:44,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:44,641 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2021-05-02 18:24:44,641 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.076923076923077) internal successors, (40), 12 states have internal predecessors, (40), 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 18:24:44,641 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2021-05-02 18:24:44,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 18:24:44,642 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:44,642 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:44,856 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 18:24:44,856 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:44,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:44,856 INFO L82 PathProgramCache]: Analyzing trace with hash -1255424219, now seen corresponding path program 8 times [2021-05-02 18:24:44,856 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:44,856 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115313581] [2021-05-02 18:24:44,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:44,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:45,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:45,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:45,043 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:24:45,043 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:45,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115313581] [2021-05-02 18:24:45,043 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1115313581] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:45,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095675514] [2021-05-02 18:24:45,043 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:45,125 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:24:45,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:45,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 18:24:45,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:45,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:45,223 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 77 proven. 126 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:24:45,223 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1095675514] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:45,223 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:45,224 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 18:24:45,224 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056568825] [2021-05-02 18:24:45,224 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 18:24:45,224 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:45,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 18:24:45,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 18:24:45,225 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 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 18:24:45,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:45,552 INFO L93 Difference]: Finished difference Result 53 states and 57 transitions. [2021-05-02 18:24:45,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 18:24:45,552 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 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 47 [2021-05-02 18:24:45,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:45,553 INFO L225 Difference]: With dead ends: 53 [2021-05-02 18:24:45,553 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 18:24:45,553 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 296.8ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:24:45,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 18:24:45,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-02 18:24:45,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 47 states have (on average 1.1063829787234043) internal successors, (52), 47 states have internal predecessors, (52), 3 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 18:24:45,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-02 18:24:45,555 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 47 [2021-05-02 18:24:45,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:45,555 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-02 18:24:45,555 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 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 18:24:45,555 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-02 18:24:45,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 18:24:45,556 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:45,556 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:45,771 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 18:24:45,772 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:45,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:45,773 INFO L82 PathProgramCache]: Analyzing trace with hash -1921820810, now seen corresponding path program 9 times [2021-05-02 18:24:45,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:45,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47525193] [2021-05-02 18:24:45,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:45,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:45,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:45,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:45,903 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 85 proven. 155 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:24:45,903 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:45,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47525193] [2021-05-02 18:24:45,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47525193] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:45,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772090018] [2021-05-02 18:24:45,903 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:46,001 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 18:24:46,001 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:46,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 18:24:46,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:46,141 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:24:46,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772090018] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:46,142 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:46,142 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 20 [2021-05-02 18:24:46,142 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450431204] [2021-05-02 18:24:46,142 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:24:46,142 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:46,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:24:46,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=333, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:24:46,143 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 20 states, 20 states have (on average 2.9) internal successors, (58), 18 states have internal predecessors, (58), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:47,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:47,009 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-05-02 18:24:47,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 18:24:47,010 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 18 states have internal predecessors, (58), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 18:24:47,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:47,010 INFO L225 Difference]: With dead ends: 62 [2021-05-02 18:24:47,010 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 18:24:47,011 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 649.6ms TimeCoverageRelationStatistics Valid=159, Invalid=1173, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 18:24:47,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 18:24:47,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-02 18:24:47,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 53 states have internal predecessors, (59), 3 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 18:24:47,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2021-05-02 18:24:47,014 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 50 [2021-05-02 18:24:47,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:47,014 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2021-05-02 18:24:47,014 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.9) internal successors, (58), 18 states have internal predecessors, (58), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:47,014 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2021-05-02 18:24:47,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 18:24:47,015 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:47,015 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:47,233 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:47,233 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:47,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:47,234 INFO L82 PathProgramCache]: Analyzing trace with hash 377883447, now seen corresponding path program 10 times [2021-05-02 18:24:47,234 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:47,234 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1129155559] [2021-05-02 18:24:47,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:47,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:47,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:47,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:47,422 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:24:47,422 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:47,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1129155559] [2021-05-02 18:24:47,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1129155559] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:47,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270252569] [2021-05-02 18:24:47,422 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:47,492 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:24:47,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:47,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 18:24:47,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:47,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:47,589 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 128 proven. 187 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:24:47,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1270252569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:47,589 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:47,589 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 18:24:47,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536256250] [2021-05-02 18:24:47,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 18:24:47,590 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:47,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 18:24:47,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 18:24:47,591 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 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 18:24:48,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:48,139 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-05-02 18:24:48,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 18:24:48,139 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 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 56 [2021-05-02 18:24:48,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:48,140 INFO L225 Difference]: With dead ends: 62 [2021-05-02 18:24:48,140 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 18:24:48,141 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 448.2ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:24:48,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 18:24:48,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 18:24:48,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.1071428571428572) internal successors, (62), 56 states have internal predecessors, (62), 3 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 18:24:48,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2021-05-02 18:24:48,144 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 56 [2021-05-02 18:24:48,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:48,145 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2021-05-02 18:24:48,145 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 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 18:24:48,145 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2021-05-02 18:24:48,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 18:24:48,147 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:48,147 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:48,361 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:48,362 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:48,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:48,363 INFO L82 PathProgramCache]: Analyzing trace with hash -2071577082, now seen corresponding path program 11 times [2021-05-02 18:24:48,363 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:48,363 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479052746] [2021-05-02 18:24:48,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:48,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:48,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:48,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:48,598 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 139 proven. 222 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:24:48,598 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:48,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479052746] [2021-05-02 18:24:48,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479052746] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:48,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638102164] [2021-05-02 18:24:48,598 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:49,355 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 18:24:49,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:49,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 18:24:49,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:49,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:49,572 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 139 proven. 222 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:24:49,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638102164] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:49,573 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:49,573 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 18:24:49,573 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256738638] [2021-05-02 18:24:49,573 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 18:24:49,573 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:49,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 18:24:49,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 18:24:49,574 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 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 18:24:50,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:50,159 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2021-05-02 18:24:50,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 18:24:50,160 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 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 59 [2021-05-02 18:24:50,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:50,160 INFO L225 Difference]: With dead ends: 65 [2021-05-02 18:24:50,160 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 18:24:50,161 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 51 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 619.5ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 18:24:50,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 18:24:50,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-05-02 18:24:50,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.1016949152542372) internal successors, (65), 59 states have internal predecessors, (65), 3 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 18:24:50,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2021-05-02 18:24:50,170 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 59 [2021-05-02 18:24:50,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:50,171 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2021-05-02 18:24:50,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 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 18:24:50,171 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2021-05-02 18:24:50,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 18:24:50,174 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:50,174 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 13, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:50,378 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 18:24:50,378 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:50,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:50,379 INFO L82 PathProgramCache]: Analyzing trace with hash 1839129815, now seen corresponding path program 12 times [2021-05-02 18:24:50,379 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:50,379 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447845350] [2021-05-02 18:24:50,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:50,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:50,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:50,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:50,623 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 150 proven. 260 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 18:24:50,623 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:50,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447845350] [2021-05-02 18:24:50,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447845350] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:50,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [102823805] [2021-05-02 18:24:50,623 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:50,816 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 18:24:50,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:50,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 18:24:50,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:51,019 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2021-05-02 18:24:51,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [102823805] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:51,020 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:51,020 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9] total 24 [2021-05-02 18:24:51,020 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202662277] [2021-05-02 18:24:51,020 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 18:24:51,021 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:51,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 18:24:51,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=494, Unknown=0, NotChecked=0, Total=552 [2021-05-02 18:24:51,022 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 22 states have internal predecessors, (70), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:52,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:52,237 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2021-05-02 18:24:52,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 18:24:52,238 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 22 states have internal predecessors, (70), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 18:24:52,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:52,238 INFO L225 Difference]: With dead ends: 74 [2021-05-02 18:24:52,238 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 18:24:52,239 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 929.2ms TimeCoverageRelationStatistics Valid=198, Invalid=1782, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 18:24:52,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 18:24:52,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2021-05-02 18:24:52,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.1076923076923078) internal successors, (72), 65 states have internal predecessors, (72), 3 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 18:24:52,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 76 transitions. [2021-05-02 18:24:52,241 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 76 transitions. Word has length 62 [2021-05-02 18:24:52,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:52,241 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 76 transitions. [2021-05-02 18:24:52,241 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.9166666666666665) internal successors, (70), 22 states have internal predecessors, (70), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:52,241 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 76 transitions. [2021-05-02 18:24:52,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 18:24:52,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:52,242 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:52,442 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 18:24:52,442 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:52,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:52,443 INFO L82 PathProgramCache]: Analyzing trace with hash 2100012214, now seen corresponding path program 13 times [2021-05-02 18:24:52,443 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:52,443 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [197662738] [2021-05-02 18:24:52,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:52,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:52,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:52,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:52,684 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 205 proven. 301 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:24:52,684 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:52,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [197662738] [2021-05-02 18:24:52,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [197662738] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:52,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658437066] [2021-05-02 18:24:52,684 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:52,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:52,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 18:24:52,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:52,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:52,836 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 205 proven. 301 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:24:52,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658437066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:52,836 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:52,836 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 18:24:52,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955584218] [2021-05-02 18:24:52,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 18:24:52,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:52,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 18:24:52,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 18:24:52,837 INFO L87 Difference]: Start difference. First operand 70 states and 76 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 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 18:24:53,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:53,566 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2021-05-02 18:24:53,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 18:24:53,566 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 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 68 [2021-05-02 18:24:53,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:53,567 INFO L225 Difference]: With dead ends: 74 [2021-05-02 18:24:53,567 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 18:24:53,567 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 557.8ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:24:53,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 18:24:53,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-02 18:24:53,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.1029411764705883) internal successors, (75), 68 states have internal predecessors, (75), 3 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 18:24:53,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 79 transitions. [2021-05-02 18:24:53,575 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 79 transitions. Word has length 68 [2021-05-02 18:24:53,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:53,575 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 79 transitions. [2021-05-02 18:24:53,575 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 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 18:24:53,575 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 79 transitions. [2021-05-02 18:24:53,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 18:24:53,576 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:53,576 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:53,792 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 18:24:53,792 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:53,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:53,793 INFO L82 PathProgramCache]: Analyzing trace with hash 1583552773, now seen corresponding path program 14 times [2021-05-02 18:24:53,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:53,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216638492] [2021-05-02 18:24:53,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:53,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:54,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:54,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:54,028 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 219 proven. 345 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:24:54,028 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:54,028 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216638492] [2021-05-02 18:24:54,028 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216638492] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:54,028 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1678833214] [2021-05-02 18:24:54,029 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:54,075 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:24:54,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:54,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 18:24:54,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:54,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:54,195 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 219 proven. 345 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:24:54,196 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1678833214] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:54,196 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:54,196 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 18:24:54,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897298181] [2021-05-02 18:24:54,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 18:24:54,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:54,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 18:24:54,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 18:24:54,197 INFO L87 Difference]: Start difference. First operand 73 states and 79 transitions. Second operand has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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 18:24:55,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:55,004 INFO L93 Difference]: Finished difference Result 77 states and 83 transitions. [2021-05-02 18:24:55,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 18:24:55,004 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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 71 [2021-05-02 18:24:55,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:55,005 INFO L225 Difference]: With dead ends: 77 [2021-05-02 18:24:55,005 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 18:24:55,005 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 592.3ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:24:55,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 18:24:55,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2021-05-02 18:24:55,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0985915492957747) internal successors, (78), 71 states have internal predecessors, (78), 3 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 18:24:55,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2021-05-02 18:24:55,007 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 71 [2021-05-02 18:24:55,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:55,008 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2021-05-02 18:24:55,008 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 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 18:24:55,008 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2021-05-02 18:24:55,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 18:24:55,008 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:55,008 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:55,225 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:55,226 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:55,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:55,226 INFO L82 PathProgramCache]: Analyzing trace with hash 313200214, now seen corresponding path program 15 times [2021-05-02 18:24:55,226 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:55,226 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120102344] [2021-05-02 18:24:55,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:55,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:55,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:55,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:55,469 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 233 proven. 392 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 18:24:55,469 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:55,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120102344] [2021-05-02 18:24:55,469 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1120102344] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:55,469 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617737883] [2021-05-02 18:24:55,469 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:55,556 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-05-02 18:24:55,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:55,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 18:24:55,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:55,798 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 0 proven. 259 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2021-05-02 18:24:55,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617737883] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:55,798 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:55,798 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 10] total 28 [2021-05-02 18:24:55,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70797375] [2021-05-02 18:24:55,799 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 18:24:55,799 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:55,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 18:24:55,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=687, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:24:55,800 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand has 28 states, 28 states have (on average 2.9285714285714284) internal successors, (82), 26 states have internal predecessors, (82), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:57,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:57,421 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2021-05-02 18:24:57,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 18:24:57,422 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.9285714285714284) internal successors, (82), 26 states have internal predecessors, (82), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-02 18:24:57,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:57,422 INFO L225 Difference]: With dead ends: 86 [2021-05-02 18:24:57,422 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 18:24:57,423 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 1202.7ms TimeCoverageRelationStatistics Valid=237, Invalid=2519, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 18:24:57,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 18:24:57,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2021-05-02 18:24:57,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 77 states have (on average 1.103896103896104) internal successors, (85), 77 states have internal predecessors, (85), 3 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 18:24:57,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 89 transitions. [2021-05-02 18:24:57,425 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 89 transitions. Word has length 74 [2021-05-02 18:24:57,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:57,425 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 89 transitions. [2021-05-02 18:24:57,425 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.9285714285714284) internal successors, (82), 26 states have internal predecessors, (82), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:24:57,425 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 89 transitions. [2021-05-02 18:24:57,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-02 18:24:57,426 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:57,426 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 17, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:57,629 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 18:24:57,629 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:57,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:57,630 INFO L82 PathProgramCache]: Analyzing trace with hash 1150747991, now seen corresponding path program 16 times [2021-05-02 18:24:57,630 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:57,630 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453285516] [2021-05-02 18:24:57,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:57,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:57,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:57,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:57,902 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 300 proven. 442 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:24:57,903 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:57,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453285516] [2021-05-02 18:24:57,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453285516] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:57,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [912395604] [2021-05-02 18:24:57,903 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:57,962 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:24:57,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:24:57,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 18:24:57,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:24:58,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:24:58,097 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 300 proven. 442 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:24:58,098 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [912395604] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:58,098 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:24:58,098 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 18:24:58,098 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306168159] [2021-05-02 18:24:58,100 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 18:24:58,100 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:24:58,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 18:24:58,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 18:24:58,100 INFO L87 Difference]: Start difference. First operand 82 states and 89 transitions. Second operand has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 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 18:24:59,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:24:59,095 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2021-05-02 18:24:59,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 18:24:59,096 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 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 18:24:59,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:24:59,096 INFO L225 Difference]: With dead ends: 86 [2021-05-02 18:24:59,096 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 18:24:59,097 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 82 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 727.4ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 18:24:59,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 18:24:59,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 18:24:59,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.1) internal successors, (88), 80 states have internal predecessors, (88), 3 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 18:24:59,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 92 transitions. [2021-05-02 18:24:59,099 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 92 transitions. Word has length 80 [2021-05-02 18:24:59,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:24:59,099 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 92 transitions. [2021-05-02 18:24:59,099 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 3.0454545454545454) internal successors, (67), 21 states have internal predecessors, (67), 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 18:24:59,099 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 92 transitions. [2021-05-02 18:24:59,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 18:24:59,099 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:24:59,099 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:24:59,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:24:59,313 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:24:59,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:24:59,313 INFO L82 PathProgramCache]: Analyzing trace with hash 78609190, now seen corresponding path program 17 times [2021-05-02 18:24:59,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:24:59,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950755381] [2021-05-02 18:24:59,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:24:59,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:59,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:24:59,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:24:59,588 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 317 proven. 495 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:24:59,588 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:24:59,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950755381] [2021-05-02 18:24:59,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950755381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:24:59,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [130613059] [2021-05-02 18:24:59,589 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:07,418 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 18:25:07,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:07,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 56 conjunts are in the unsatisfiable core [2021-05-02 18:25:07,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:07,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:07,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:07,819 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 317 proven. 495 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:25:07,820 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [130613059] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:07,820 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:07,820 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 18:25:07,820 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466050667] [2021-05-02 18:25:07,820 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 18:25:07,820 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:07,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 18:25:07,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 18:25:07,821 INFO L87 Difference]: Start difference. First operand 85 states and 92 transitions. Second operand has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 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 18:25:08,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:08,959 INFO L93 Difference]: Finished difference Result 89 states and 96 transitions. [2021-05-02 18:25:08,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 18:25:08,960 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 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 83 [2021-05-02 18:25:08,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:08,960 INFO L225 Difference]: With dead ends: 89 [2021-05-02 18:25:08,960 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 18:25:08,961 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 68 SyntacticMatches, 18 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 1065.3ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 18:25:08,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 18:25:08,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-05-02 18:25:08,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 83 states have (on average 1.0963855421686748) internal successors, (91), 83 states have internal predecessors, (91), 3 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 18:25:08,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 95 transitions. [2021-05-02 18:25:08,964 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 95 transitions. Word has length 83 [2021-05-02 18:25:08,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:08,964 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 95 transitions. [2021-05-02 18:25:08,964 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.0434782608695654) internal successors, (70), 22 states have internal predecessors, (70), 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 18:25:08,964 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 95 transitions. [2021-05-02 18:25:08,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 18:25:08,965 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:08,965 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 19, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:09,169 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:09,169 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:09,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:09,170 INFO L82 PathProgramCache]: Analyzing trace with hash 1663368951, now seen corresponding path program 18 times [2021-05-02 18:25:09,170 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:09,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572640725] [2021-05-02 18:25:09,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:09,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:09,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:09,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:09,531 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 334 proven. 551 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 18:25:09,531 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:09,531 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572640725] [2021-05-02 18:25:09,531 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572640725] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:09,531 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [365544116] [2021-05-02 18:25:09,531 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:10,044 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 18:25:10,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:10,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 18:25:10,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:10,345 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 0 proven. 374 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2021-05-02 18:25:10,345 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [365544116] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:10,345 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:10,345 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 11] total 32 [2021-05-02 18:25:10,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876304099] [2021-05-02 18:25:10,346 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 18:25:10,346 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:10,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 18:25:10,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=912, Unknown=0, NotChecked=0, Total=992 [2021-05-02 18:25:10,347 INFO L87 Difference]: Start difference. First operand 88 states and 95 transitions. Second operand has 32 states, 32 states have (on average 2.9375) internal successors, (94), 30 states have internal predecessors, (94), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:12,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:12,307 INFO L93 Difference]: Finished difference Result 98 states and 106 transitions. [2021-05-02 18:25:12,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 18:25:12,308 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.9375) internal successors, (94), 30 states have internal predecessors, (94), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2021-05-02 18:25:12,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:12,309 INFO L225 Difference]: With dead ends: 98 [2021-05-02 18:25:12,309 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 18:25:12,310 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 415 ImplicationChecksByTransitivity, 1469.0ms TimeCoverageRelationStatistics Valid=276, Invalid=3384, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 18:25:12,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 18:25:12,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2021-05-02 18:25:12,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.101123595505618) internal successors, (98), 89 states have internal predecessors, (98), 3 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 18:25:12,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 102 transitions. [2021-05-02 18:25:12,312 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 102 transitions. Word has length 86 [2021-05-02 18:25:12,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:12,313 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 102 transitions. [2021-05-02 18:25:12,313 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.9375) internal successors, (94), 30 states have internal predecessors, (94), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:12,313 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 102 transitions. [2021-05-02 18:25:12,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 18:25:12,313 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:12,313 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 20, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:12,517 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 18:25:12,518 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:12,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:12,518 INFO L82 PathProgramCache]: Analyzing trace with hash 524874646, now seen corresponding path program 19 times [2021-05-02 18:25:12,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:12,519 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250907509] [2021-05-02 18:25:12,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:12,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:12,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:12,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:12,895 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 413 proven. 610 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:25:12,895 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:12,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250907509] [2021-05-02 18:25:12,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250907509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:12,895 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [665960523] [2021-05-02 18:25:12,895 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:12,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:12,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 18:25:12,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:13,110 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:13,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 413 proven. 610 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:25:13,132 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [665960523] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:13,132 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:13,132 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 18:25:13,132 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681170106] [2021-05-02 18:25:13,132 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 18:25:13,132 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:13,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 18:25:13,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 18:25:13,133 INFO L87 Difference]: Start difference. First operand 94 states and 102 transitions. Second operand has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 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 18:25:14,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:14,537 INFO L93 Difference]: Finished difference Result 98 states and 106 transitions. [2021-05-02 18:25:14,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 18:25:14,538 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 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 92 [2021-05-02 18:25:14,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:14,538 INFO L225 Difference]: With dead ends: 98 [2021-05-02 18:25:14,538 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 18:25:14,539 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 1036.9ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:25:14,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 18:25:14,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-05-02 18:25:14,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0978260869565217) internal successors, (101), 92 states have internal predecessors, (101), 3 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 18:25:14,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 105 transitions. [2021-05-02 18:25:14,541 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 105 transitions. Word has length 92 [2021-05-02 18:25:14,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:14,541 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 105 transitions. [2021-05-02 18:25:14,541 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 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 18:25:14,541 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 105 transitions. [2021-05-02 18:25:14,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 18:25:14,542 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:14,542 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 21, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:14,756 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:14,757 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:14,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:14,757 INFO L82 PathProgramCache]: Analyzing trace with hash 961293029, now seen corresponding path program 20 times [2021-05-02 18:25:14,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:14,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906780659] [2021-05-02 18:25:14,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:14,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:15,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:15,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:15,236 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 433 proven. 672 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:25:15,236 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:15,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906780659] [2021-05-02 18:25:15,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1906780659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:15,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799783763] [2021-05-02 18:25:15,237 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:15,304 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:25:15,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:15,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 18:25:15,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:15,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:15,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1162 backedges. 433 proven. 672 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:25:15,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1799783763] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:15,483 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:15,483 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 18:25:15,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960398380] [2021-05-02 18:25:15,483 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 18:25:15,483 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:15,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 18:25:15,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 18:25:15,484 INFO L87 Difference]: Start difference. First operand 97 states and 105 transitions. Second operand has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 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 18:25:16,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:16,870 INFO L93 Difference]: Finished difference Result 101 states and 109 transitions. [2021-05-02 18:25:16,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 18:25:16,870 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 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 18:25:16,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:16,871 INFO L225 Difference]: With dead ends: 101 [2021-05-02 18:25:16,871 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 18:25:16,872 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 1116.3ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 18:25:16,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 18:25:16,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 100. [2021-05-02 18:25:16,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 95 states have (on average 1.0947368421052632) internal successors, (104), 95 states have internal predecessors, (104), 3 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 18:25:16,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 108 transitions. [2021-05-02 18:25:16,874 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 108 transitions. Word has length 95 [2021-05-02 18:25:16,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:16,874 INFO L480 AbstractCegarLoop]: Abstraction has 100 states and 108 transitions. [2021-05-02 18:25:16,874 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 3.0384615384615383) internal successors, (79), 25 states have internal predecessors, (79), 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 18:25:16,874 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 108 transitions. [2021-05-02 18:25:16,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-05-02 18:25:16,875 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:16,875 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 22, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:17,088 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 18:25:17,089 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:17,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:17,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1435335990, now seen corresponding path program 21 times [2021-05-02 18:25:17,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:17,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068852743] [2021-05-02 18:25:17,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:17,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:17,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:17,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:17,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 453 proven. 737 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 18:25:17,489 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:17,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068852743] [2021-05-02 18:25:17,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068852743] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:17,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749846049] [2021-05-02 18:25:17,489 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:17,598 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-05-02 18:25:17,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:17,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 18:25:17,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:17,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1247 backedges. 0 proven. 510 refuted. 0 times theorem prover too weak. 737 trivial. 0 not checked. [2021-05-02 18:25:17,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1749846049] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:17,965 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:17,965 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 12] total 36 [2021-05-02 18:25:17,965 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556687283] [2021-05-02 18:25:17,965 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 18:25:17,965 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:17,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 18:25:17,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=1169, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:25:17,966 INFO L87 Difference]: Start difference. First operand 100 states and 108 transitions. Second operand has 36 states, 36 states have (on average 2.9444444444444446) internal successors, (106), 34 states have internal predecessors, (106), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:20,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:20,615 INFO L93 Difference]: Finished difference Result 110 states and 119 transitions. [2021-05-02 18:25:20,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 18:25:20,616 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.9444444444444446) internal successors, (106), 34 states have internal predecessors, (106), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 98 [2021-05-02 18:25:20,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:20,616 INFO L225 Difference]: With dead ends: 110 [2021-05-02 18:25:20,616 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 18:25:20,617 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 1887.4ms TimeCoverageRelationStatistics Valid=315, Invalid=4377, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 18:25:20,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 18:25:20,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-05-02 18:25:20,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.099009900990099) internal successors, (111), 101 states have internal predecessors, (111), 3 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 18:25:20,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 115 transitions. [2021-05-02 18:25:20,620 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 115 transitions. Word has length 98 [2021-05-02 18:25:20,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:20,620 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 115 transitions. [2021-05-02 18:25:20,621 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.9444444444444446) internal successors, (106), 34 states have internal predecessors, (106), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:25:20,621 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 115 transitions. [2021-05-02 18:25:20,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-02 18:25:20,621 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:20,621 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 23, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:20,824 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 18:25:20,824 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:20,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:20,825 INFO L82 PathProgramCache]: Analyzing trace with hash 496715639, now seen corresponding path program 22 times [2021-05-02 18:25:20,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:20,825 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102100039] [2021-05-02 18:25:20,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:20,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:21,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:21,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:21,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 544 proven. 805 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:25:21,262 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:21,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102100039] [2021-05-02 18:25:21,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2102100039] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:21,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1550833280] [2021-05-02 18:25:21,262 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:21,332 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:25:21,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:25:21,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 18:25:21,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:25:21,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:25:21,483 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 544 proven. 805 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:25:21,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1550833280] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:21,484 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:25:21,484 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 18:25:21,484 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057000065] [2021-05-02 18:25:21,484 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 18:25:21,484 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:25:21,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 18:25:21,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 18:25:21,485 INFO L87 Difference]: Start difference. First operand 106 states and 115 transitions. Second operand has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 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 18:25:23,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:25:23,222 INFO L93 Difference]: Finished difference Result 110 states and 119 transitions. [2021-05-02 18:25:23,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 18:25:23,223 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 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 104 [2021-05-02 18:25:23,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:25:23,223 INFO L225 Difference]: With dead ends: 110 [2021-05-02 18:25:23,223 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 18:25:23,224 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 1247.3ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 18:25:23,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 18:25:23,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2021-05-02 18:25:23,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0961538461538463) internal successors, (114), 104 states have internal predecessors, (114), 3 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 18:25:23,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 118 transitions. [2021-05-02 18:25:23,226 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 118 transitions. Word has length 104 [2021-05-02 18:25:23,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:25:23,226 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 118 transitions. [2021-05-02 18:25:23,226 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 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 18:25:23,226 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 118 transitions. [2021-05-02 18:25:23,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 18:25:23,227 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:25:23,227 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 24, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:25:23,439 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:25:23,440 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:25:23,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:25:23,441 INFO L82 PathProgramCache]: Analyzing trace with hash 200474694, now seen corresponding path program 23 times [2021-05-02 18:25:23,441 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:25:23,441 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401605616] [2021-05-02 18:25:23,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:25:23,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:23,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:25:23,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:25:23,953 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 567 proven. 876 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:25:23,953 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:25:23,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401605616] [2021-05-02 18:25:23,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401605616] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:25:23,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317869596] [2021-05-02 18:25:23,954 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:01,337 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 33 check-sat command(s) [2021-05-02 18:26:01,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:01,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 61 conjunts are in the unsatisfiable core [2021-05-02 18:26:01,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:01,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:01,626 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 237 proven. 1276 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:26:01,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317869596] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:01,626 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:01,626 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 32] total 34 [2021-05-02 18:26:01,626 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903581046] [2021-05-02 18:26:01,626 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 18:26:01,627 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:01,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 18:26:01,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=1032, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 18:26:01,627 INFO L87 Difference]: Start difference. First operand 109 states and 118 transitions. Second operand has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 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 18:26:03,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:03,999 INFO L93 Difference]: Finished difference Result 128 states and 137 transitions. [2021-05-02 18:26:03,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 18:26:04,000 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 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 107 [2021-05-02 18:26:04,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:04,001 INFO L225 Difference]: With dead ends: 128 [2021-05-02 18:26:04,001 INFO L226 Difference]: Without dead ends: 128 [2021-05-02 18:26:04,002 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 454 ImplicationChecksByTransitivity, 1647.3ms TimeCoverageRelationStatistics Valid=235, Invalid=3797, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 18:26:04,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-02 18:26:04,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2021-05-02 18:26:04,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0819672131147542) internal successors, (132), 122 states have internal predecessors, (132), 3 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 18:26:04,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 136 transitions. [2021-05-02 18:26:04,003 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 136 transitions. Word has length 107 [2021-05-02 18:26:04,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:04,004 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 136 transitions. [2021-05-02 18:26:04,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 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 18:26:04,004 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 136 transitions. [2021-05-02 18:26:04,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 18:26:04,004 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:04,004 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 30, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:04,209 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 18:26:04,209 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:04,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:04,214 INFO L82 PathProgramCache]: Analyzing trace with hash 798502758, now seen corresponding path program 24 times [2021-05-02 18:26:04,214 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:04,214 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [958876064] [2021-05-02 18:26:04,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:04,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:04,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:04,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:04,941 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 705 proven. 1365 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 18:26:04,941 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:04,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [958876064] [2021-05-02 18:26:04,941 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [958876064] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:04,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666362484] [2021-05-02 18:26:04,941 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:06,313 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 18:26:06,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:06,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 18:26:06,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:06,923 INFO L134 CoverageAnalysis]: Checked inductivity of 2147 backedges. 0 proven. 782 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2021-05-02 18:26:06,923 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666362484] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:06,924 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:06,924 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 13] total 45 [2021-05-02 18:26:06,924 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952593855] [2021-05-02 18:26:06,924 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 18:26:06,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:06,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 18:26:06,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1863, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 18:26:06,926 INFO L87 Difference]: Start difference. First operand 127 states and 136 transitions. Second operand has 45 states, 45 states have (on average 2.9555555555555557) internal successors, (133), 43 states have internal predecessors, (133), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:10,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:10,943 INFO L93 Difference]: Finished difference Result 137 states and 147 transitions. [2021-05-02 18:26:10,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 18:26:10,943 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.9555555555555557) internal successors, (133), 43 states have internal predecessors, (133), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 125 [2021-05-02 18:26:10,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:10,944 INFO L225 Difference]: With dead ends: 137 [2021-05-02 18:26:10,944 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 18:26:10,945 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 872 ImplicationChecksByTransitivity, 2897.2ms TimeCoverageRelationStatistics Valid=409, Invalid=7073, Unknown=0, NotChecked=0, Total=7482 [2021-05-02 18:26:10,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 18:26:10,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2021-05-02 18:26:10,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0859375) internal successors, (139), 128 states have internal predecessors, (139), 3 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 18:26:10,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 143 transitions. [2021-05-02 18:26:10,947 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 143 transitions. Word has length 125 [2021-05-02 18:26:10,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:10,947 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 143 transitions. [2021-05-02 18:26:10,947 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.9555555555555557) internal successors, (133), 43 states have internal predecessors, (133), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:10,947 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 143 transitions. [2021-05-02 18:26:10,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 18:26:10,948 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:10,948 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:11,151 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:11,152 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:11,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:11,152 INFO L82 PathProgramCache]: Analyzing trace with hash -256208507, now seen corresponding path program 25 times [2021-05-02 18:26:11,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:11,152 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [703799657] [2021-05-02 18:26:11,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:11,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:11,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:11,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:11,837 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:26:11,837 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:11,837 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [703799657] [2021-05-02 18:26:11,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [703799657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:11,837 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1702704765] [2021-05-02 18:26:11,837 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:11,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:11,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 18:26:11,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:12,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:12,076 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:26:12,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1702704765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:12,076 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:12,076 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 18:26:12,077 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573664215] [2021-05-02 18:26:12,077 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 18:26:12,077 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:12,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 18:26:12,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 18:26:12,078 INFO L87 Difference]: Start difference. First operand 133 states and 143 transitions. Second operand has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 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 18:26:14,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:14,730 INFO L93 Difference]: Finished difference Result 137 states and 147 transitions. [2021-05-02 18:26:14,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 18:26:14,730 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 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 131 [2021-05-02 18:26:14,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:14,731 INFO L225 Difference]: With dead ends: 137 [2021-05-02 18:26:14,731 INFO L226 Difference]: Without dead ends: 137 [2021-05-02 18:26:14,732 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1861.2ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 18:26:14,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-02 18:26:14,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2021-05-02 18:26:14,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.083969465648855) internal successors, (142), 131 states have internal predecessors, (142), 3 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 18:26:14,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 146 transitions. [2021-05-02 18:26:14,734 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 146 transitions. Word has length 131 [2021-05-02 18:26:14,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:14,734 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 146 transitions. [2021-05-02 18:26:14,734 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 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 18:26:14,734 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 146 transitions. [2021-05-02 18:26:14,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-02 18:26:14,735 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:14,735 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:14,950 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 18:26:14,950 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:14,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:14,951 INFO L82 PathProgramCache]: Analyzing trace with hash -1168847018, now seen corresponding path program 26 times [2021-05-02 18:26:14,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:14,951 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636090550] [2021-05-02 18:26:14,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:14,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:15,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:15,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:15,662 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:26:15,662 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:15,662 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636090550] [2021-05-02 18:26:15,662 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636090550] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:15,663 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652155397] [2021-05-02 18:26:15,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:15,710 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:26:15,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:15,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 18:26:15,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:15,874 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:15,901 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:26:15,901 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1652155397] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:15,902 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:15,902 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 18:26:15,902 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466774480] [2021-05-02 18:26:15,902 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 18:26:15,902 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:15,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 18:26:15,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 18:26:15,903 INFO L87 Difference]: Start difference. First operand 136 states and 146 transitions. Second operand has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 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 18:26:18,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:18,692 INFO L93 Difference]: Finished difference Result 140 states and 150 transitions. [2021-05-02 18:26:18,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 18:26:18,693 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 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 134 [2021-05-02 18:26:18,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:18,693 INFO L225 Difference]: With dead ends: 140 [2021-05-02 18:26:18,693 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 18:26:18,694 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1922.3ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 18:26:18,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 18:26:18,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-02 18:26:18,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0820895522388059) internal successors, (145), 134 states have internal predecessors, (145), 3 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 18:26:18,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 149 transitions. [2021-05-02 18:26:18,696 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 149 transitions. Word has length 134 [2021-05-02 18:26:18,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:18,696 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 149 transitions. [2021-05-02 18:26:18,696 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 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 18:26:18,696 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 149 transitions. [2021-05-02 18:26:18,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 18:26:18,697 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:18,697 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 33, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:18,905 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 18:26:18,905 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:18,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:18,905 INFO L82 PathProgramCache]: Analyzing trace with hash 1855222757, now seen corresponding path program 27 times [2021-05-02 18:26:18,905 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:18,905 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1393901503] [2021-05-02 18:26:18,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:18,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:19,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:19,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:19,679 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 875 proven. 1650 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 18:26:19,679 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:19,679 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1393901503] [2021-05-02 18:26:19,680 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1393901503] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:19,680 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [154170272] [2021-05-02 18:26:19,680 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:19,832 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 18:26:19,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:19,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 18:26:19,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:20,423 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2021-05-02 18:26:20,423 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [154170272] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:20,423 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:20,423 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 14] total 49 [2021-05-02 18:26:20,423 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291105904] [2021-05-02 18:26:20,424 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 18:26:20,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:20,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 18:26:20,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=2224, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 18:26:20,424 INFO L87 Difference]: Start difference. First operand 139 states and 149 transitions. Second operand has 49 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 47 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:24,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:24,914 INFO L93 Difference]: Finished difference Result 149 states and 160 transitions. [2021-05-02 18:26:24,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 18:26:24,914 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 47 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2021-05-02 18:26:24,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:24,915 INFO L225 Difference]: With dead ends: 149 [2021-05-02 18:26:24,915 INFO L226 Difference]: Without dead ends: 146 [2021-05-02 18:26:24,916 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1047 ImplicationChecksByTransitivity, 3042.5ms TimeCoverageRelationStatistics Valid=448, Invalid=8482, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 18:26:24,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-02 18:26:24,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2021-05-02 18:26:24,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0857142857142856) internal successors, (152), 140 states have internal predecessors, (152), 3 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 18:26:24,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 156 transitions. [2021-05-02 18:26:24,918 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 156 transitions. Word has length 137 [2021-05-02 18:26:24,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:24,918 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 156 transitions. [2021-05-02 18:26:24,918 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.9591836734693877) internal successors, (145), 47 states have internal predecessors, (145), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:26:24,918 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 156 transitions. [2021-05-02 18:26:24,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-05-02 18:26:24,919 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:24,919 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 34, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:25,119 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:25,119 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:25,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:25,120 INFO L82 PathProgramCache]: Analyzing trace with hash 1060325926, now seen corresponding path program 28 times [2021-05-02 18:26:25,120 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:25,120 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240716096] [2021-05-02 18:26:25,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:25,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:25,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:25,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:25,898 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 1005 proven. 1751 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:26:25,898 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:25,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240716096] [2021-05-02 18:26:25,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240716096] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:25,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120147590] [2021-05-02 18:26:25,898 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:25,958 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:26:25,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:26:25,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 85 conjunts are in the unsatisfiable core [2021-05-02 18:26:25,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:26:26,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:26:26,464 INFO L134 CoverageAnalysis]: Checked inductivity of 2882 backedges. 333 proven. 2542 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 18:26:26,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1120147590] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:26,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:26:26,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 44] total 46 [2021-05-02 18:26:26,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894197774] [2021-05-02 18:26:26,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 18:26:26,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:26:26,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 18:26:26,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1946, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 18:26:26,466 INFO L87 Difference]: Start difference. First operand 145 states and 156 transitions. Second operand has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 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 18:26:29,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:26:29,952 INFO L93 Difference]: Finished difference Result 170 states and 181 transitions. [2021-05-02 18:26:29,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 18:26:29,952 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 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 18:26:29,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:26:29,953 INFO L225 Difference]: With dead ends: 170 [2021-05-02 18:26:29,953 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 18:26:29,954 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 138 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 886 ImplicationChecksByTransitivity, 2637.7ms TimeCoverageRelationStatistics Valid=327, Invalid=7329, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 18:26:29,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 18:26:29,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2021-05-02 18:26:29,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0731707317073171) internal successors, (176), 164 states have internal predecessors, (176), 3 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 18:26:29,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 180 transitions. [2021-05-02 18:26:29,956 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 180 transitions. Word has length 143 [2021-05-02 18:26:29,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:26:29,957 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 180 transitions. [2021-05-02 18:26:29,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 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 18:26:29,957 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 180 transitions. [2021-05-02 18:26:29,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-02 18:26:29,957 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:26:29,957 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 42, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:26:30,174 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:26:30,174 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:26:30,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:26:30,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1297408934, now seen corresponding path program 29 times [2021-05-02 18:26:30,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:26:30,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154256375] [2021-05-02 18:26:30,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:26:30,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:31,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:26:31,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:26:31,231 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1237 proven. 2667 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:26:31,231 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:26:31,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154256375] [2021-05-02 18:26:31,232 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154256375] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:26:31,232 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956304054] [2021-05-02 18:26:31,232 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:40,167 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 53 check-sat command(s) [2021-05-02 18:33:40,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:40,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 136 conjunts are in the unsatisfiable core [2021-05-02 18:33:40,201 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:41,360 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1237 proven. 2667 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:33:41,361 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956304054] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:41,361 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:41,361 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 18:33:41,361 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670145642] [2021-05-02 18:33:41,361 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 18:33:41,361 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:41,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 18:33:41,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 18:33:41,362 INFO L87 Difference]: Start difference. First operand 169 states and 180 transitions. Second operand has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 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 18:33:45,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:45,615 INFO L93 Difference]: Finished difference Result 173 states and 184 transitions. [2021-05-02 18:33:45,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 18:33:45,615 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 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 167 [2021-05-02 18:33:45,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:45,616 INFO L225 Difference]: With dead ends: 173 [2021-05-02 18:33:45,616 INFO L226 Difference]: Without dead ends: 173 [2021-05-02 18:33:45,617 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 128 SyntacticMatches, 42 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 3731.6ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 18:33:45,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-02 18:33:45,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2021-05-02 18:33:45,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 167 states have (on average 1.0718562874251496) internal successors, (179), 167 states have internal predecessors, (179), 3 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 18:33:45,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 183 transitions. [2021-05-02 18:33:45,620 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 183 transitions. Word has length 167 [2021-05-02 18:33:45,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:45,620 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 183 transitions. [2021-05-02 18:33:45,620 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 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 18:33:45,620 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 183 transitions. [2021-05-02 18:33:45,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-05-02 18:33:45,621 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:45,621 INFO L523 BasicCegarLoop]: trace histogram [53, 53, 43, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:45,834 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-02 18:33:45,835 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:45,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:45,835 INFO L82 PathProgramCache]: Analyzing trace with hash -614970121, now seen corresponding path program 30 times [2021-05-02 18:33:45,836 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:45,836 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2100752518] [2021-05-02 18:33:45,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:45,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:46,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:46,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:47,002 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 1266 proven. 2795 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 18:33:47,002 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:47,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2100752518] [2021-05-02 18:33:47,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2100752518] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:47,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [759222252] [2021-05-02 18:33:47,002 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:50,293 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 18:33:50,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:33:50,299 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 18:33:50,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:51,114 INFO L134 CoverageAnalysis]: Checked inductivity of 4187 backedges. 0 proven. 1392 refuted. 0 times theorem prover too weak. 2795 trivial. 0 not checked. [2021-05-02 18:33:51,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [759222252] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:51,115 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:51,115 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 15] total 60 [2021-05-02 18:33:51,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493676704] [2021-05-02 18:33:51,115 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 18:33:51,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:51,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 18:33:51,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=3380, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 18:33:51,117 INFO L87 Difference]: Start difference. First operand 172 states and 183 transitions. Second operand has 60 states, 60 states have (on average 2.966666666666667) internal successors, (178), 58 states have internal predecessors, (178), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:57,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:33:57,144 INFO L93 Difference]: Finished difference Result 182 states and 194 transitions. [2021-05-02 18:33:57,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-05-02 18:33:57,144 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.966666666666667) internal successors, (178), 58 states have internal predecessors, (178), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 170 [2021-05-02 18:33:57,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:33:57,145 INFO L225 Difference]: With dead ends: 182 [2021-05-02 18:33:57,146 INFO L226 Difference]: Without dead ends: 179 [2021-05-02 18:33:57,147 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1609 ImplicationChecksByTransitivity, 4281.0ms TimeCoverageRelationStatistics Valid=564, Invalid=13008, Unknown=0, NotChecked=0, Total=13572 [2021-05-02 18:33:57,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-02 18:33:57,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2021-05-02 18:33:57,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.0751445086705202) internal successors, (186), 173 states have internal predecessors, (186), 3 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 18:33:57,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 190 transitions. [2021-05-02 18:33:57,150 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 190 transitions. Word has length 170 [2021-05-02 18:33:57,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:33:57,150 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 190 transitions. [2021-05-02 18:33:57,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 2.966666666666667) internal successors, (178), 58 states have internal predecessors, (178), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:33:57,150 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 190 transitions. [2021-05-02 18:33:57,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-05-02 18:33:57,151 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:33:57,151 INFO L523 BasicCegarLoop]: trace histogram [55, 55, 44, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:33:57,358 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:57,358 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:33:57,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:33:57,359 INFO L82 PathProgramCache]: Analyzing trace with hash -241784042, now seen corresponding path program 31 times [2021-05-02 18:33:57,359 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:33:57,359 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [23161328] [2021-05-02 18:33:57,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:33:57,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:58,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:33:58,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:58,605 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1429 proven. 2926 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:33:58,605 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:33:58,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [23161328] [2021-05-02 18:33:58,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [23161328] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:58,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467812415] [2021-05-02 18:33:58,606 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:33:58,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:33:58,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 18:33:58,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:33:58,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:33:58,925 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1429 proven. 2926 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:33:58,925 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1467812415] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:33:58,925 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:33:58,925 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 18:33:58,926 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098130575] [2021-05-02 18:33:58,926 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 18:33:58,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:33:58,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 18:33:58,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 18:33:58,927 INFO L87 Difference]: Start difference. First operand 178 states and 190 transitions. Second operand has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 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 18:34:03,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:03,639 INFO L93 Difference]: Finished difference Result 182 states and 194 transitions. [2021-05-02 18:34:03,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 18:34:03,640 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 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 176 [2021-05-02 18:34:03,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:03,641 INFO L225 Difference]: With dead ends: 182 [2021-05-02 18:34:03,641 INFO L226 Difference]: Without dead ends: 182 [2021-05-02 18:34:03,641 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 3167.5ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 18:34:03,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-02 18:34:03,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2021-05-02 18:34:03,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0738636363636365) internal successors, (189), 176 states have internal predecessors, (189), 3 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 18:34:03,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 193 transitions. [2021-05-02 18:34:03,645 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 193 transitions. Word has length 176 [2021-05-02 18:34:03,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:03,645 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 193 transitions. [2021-05-02 18:34:03,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 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 18:34:03,645 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 193 transitions. [2021-05-02 18:34:03,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-02 18:34:03,646 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:03,646 INFO L523 BasicCegarLoop]: trace histogram [56, 56, 45, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:03,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 18:34:03,864 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:03,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:03,864 INFO L82 PathProgramCache]: Analyzing trace with hash -510251803, now seen corresponding path program 32 times [2021-05-02 18:34:03,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:03,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666954579] [2021-05-02 18:34:03,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:03,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:05,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:05,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:05,250 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1461 proven. 3060 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:34:05,250 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:05,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1666954579] [2021-05-02 18:34:05,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1666954579] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:05,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859528797] [2021-05-02 18:34:05,251 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:34:05,319 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:34:05,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:34:05,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-02 18:34:05,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:34:05,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:05,598 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1461 proven. 3060 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:34:05,599 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859528797] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:05,599 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:34:05,599 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 18:34:05,599 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830317205] [2021-05-02 18:34:05,600 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 18:34:05,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:34:05,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 18:34:05,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 18:34:05,601 INFO L87 Difference]: Start difference. First operand 181 states and 193 transitions. Second operand has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 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 18:34:10,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:10,894 INFO L93 Difference]: Finished difference Result 185 states and 197 transitions. [2021-05-02 18:34:10,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 18:34:10,894 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 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 179 [2021-05-02 18:34:10,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:10,895 INFO L225 Difference]: With dead ends: 185 [2021-05-02 18:34:10,896 INFO L226 Difference]: Without dead ends: 185 [2021-05-02 18:34:10,896 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 181 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1039 ImplicationChecksByTransitivity, 3456.4ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 18:34:10,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-02 18:34:10,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2021-05-02 18:34:10,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.0726256983240223) internal successors, (192), 179 states have internal predecessors, (192), 3 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 18:34:10,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 196 transitions. [2021-05-02 18:34:10,899 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 196 transitions. Word has length 179 [2021-05-02 18:34:10,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:10,900 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 196 transitions. [2021-05-02 18:34:10,900 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 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 18:34:10,900 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 196 transitions. [2021-05-02 18:34:10,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-05-02 18:34:10,901 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:10,901 INFO L523 BasicCegarLoop]: trace histogram [57, 57, 46, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:11,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 18:34:11,118 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:11,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:11,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1204214602, now seen corresponding path program 33 times [2021-05-02 18:34:11,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:11,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604425760] [2021-05-02 18:34:11,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:11,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:12,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:12,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:12,451 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1493 proven. 3197 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 18:34:12,451 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:12,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604425760] [2021-05-02 18:34:12,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604425760] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:12,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069655832] [2021-05-02 18:34:12,452 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:34:12,629 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-02 18:34:12,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:34:12,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 18:34:12,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:34:13,550 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 0 proven. 1648 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2021-05-02 18:34:13,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069655832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:13,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:34:13,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 16] total 64 [2021-05-02 18:34:13,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491408076] [2021-05-02 18:34:13,552 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 18:34:13,552 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:34:13,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 18:34:13,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=3861, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 18:34:13,553 INFO L87 Difference]: Start difference. First operand 184 states and 196 transitions. Second operand has 64 states, 64 states have (on average 2.96875) internal successors, (190), 62 states have internal predecessors, (190), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:34:21,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:21,439 INFO L93 Difference]: Finished difference Result 194 states and 207 transitions. [2021-05-02 18:34:21,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-02 18:34:21,440 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.96875) internal successors, (190), 62 states have internal predecessors, (190), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 182 [2021-05-02 18:34:21,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:21,440 INFO L225 Difference]: With dead ends: 194 [2021-05-02 18:34:21,441 INFO L226 Difference]: Without dead ends: 191 [2021-05-02 18:34:21,441 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1844 ImplicationChecksByTransitivity, 5262.0ms TimeCoverageRelationStatistics Valid=603, Invalid=14897, Unknown=0, NotChecked=0, Total=15500 [2021-05-02 18:34:21,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-05-02 18:34:21,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2021-05-02 18:34:21,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.0756756756756756) internal successors, (199), 185 states have internal predecessors, (199), 3 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 18:34:21,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2021-05-02 18:34:21,444 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 182 [2021-05-02 18:34:21,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:21,444 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2021-05-02 18:34:21,444 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 2.96875) internal successors, (190), 62 states have internal predecessors, (190), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:34:21,444 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2021-05-02 18:34:21,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-05-02 18:34:21,445 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:21,445 INFO L523 BasicCegarLoop]: trace histogram [59, 59, 47, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:21,652 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 18:34:21,653 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:21,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:21,653 INFO L82 PathProgramCache]: Analyzing trace with hash 136574327, now seen corresponding path program 34 times [2021-05-02 18:34:21,653 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:21,653 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499754229] [2021-05-02 18:34:21,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:21,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:23,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:23,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:23,011 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1668 proven. 3337 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 18:34:23,011 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:23,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499754229] [2021-05-02 18:34:23,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499754229] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:23,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [609877300] [2021-05-02 18:34:23,011 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:34:23,083 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 18:34:23,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:34:23,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 97 conjunts are in the unsatisfiable core [2021-05-02 18:34:23,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:34:23,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:34:23,361 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1668 proven. 3337 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 18:34:23,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [609877300] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:23,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:34:23,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 18:34:23,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068531261] [2021-05-02 18:34:23,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 18:34:23,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:34:23,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 18:34:23,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 18:34:23,363 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 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 18:34:28,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:34:28,705 INFO L93 Difference]: Finished difference Result 194 states and 207 transitions. [2021-05-02 18:34:28,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 18:34:28,705 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 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 188 [2021-05-02 18:34:28,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:34:28,706 INFO L225 Difference]: With dead ends: 194 [2021-05-02 18:34:28,706 INFO L226 Difference]: Without dead ends: 194 [2021-05-02 18:34:28,707 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 190 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1132 ImplicationChecksByTransitivity, 3483.4ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 18:34:28,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-02 18:34:28,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2021-05-02 18:34:28,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.074468085106383) internal successors, (202), 188 states have internal predecessors, (202), 3 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 18:34:28,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 206 transitions. [2021-05-02 18:34:28,710 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 206 transitions. Word has length 188 [2021-05-02 18:34:28,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:34:28,710 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 206 transitions. [2021-05-02 18:34:28,710 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 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 18:34:28,710 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 206 transitions. [2021-05-02 18:34:28,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-02 18:34:28,711 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:34:28,711 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 48, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:34:28,920 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 18:34:28,921 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:34:28,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:34:28,921 INFO L82 PathProgramCache]: Analyzing trace with hash -740542266, now seen corresponding path program 35 times [2021-05-02 18:34:28,921 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:34:28,921 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918094072] [2021-05-02 18:34:28,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:34:28,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:30,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:34:30,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:34:30,268 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1703 proven. 3480 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 18:34:30,268 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:34:30,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918094072] [2021-05-02 18:34:30,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [918094072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:34:30,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868138494] [2021-05-02 18:34:30,268 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true