/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/loop-simple/nested_6.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 19:07:17,581 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 19:07:17,584 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 19:07:17,621 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 19:07:17,641 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 19:07:17,643 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 19:07:17,644 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 19:07:17,646 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 19:07:17,648 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 19:07:17,649 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 19:07:17,650 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 19:07:17,651 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 19:07:17,652 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 19:07:17,654 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 19:07:17,655 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 19:07:17,657 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 19:07:17,662 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 19:07:17,666 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 19:07:17,667 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 19:07:17,667 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 19:07:17,670 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 19:07:17,683 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 19:07:17,683 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 19:07:17,686 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 19:07:17,686 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 19:07:17,687 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 19:07:17,687 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 19:07:17,687 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 19:07:17,687 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 19:07:17,687 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 19:07:17,687 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 19:07:17,688 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 19:07:17,688 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 19:07:17,688 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 19:07:17,688 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 19:07:17,688 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 19:07:17,688 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 19:07:17,689 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 19:07:17,689 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 19:07:17,689 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 19:07:17,689 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 19:07:17,689 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 19:07:17,690 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 19:07:17,690 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 19:07:17,982 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 19:07:17,996 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 19:07:17,997 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 19:07:17,998 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 19:07:17,999 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 19:07:17,999 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-simple/nested_6.c [2021-05-02 19:07:18,067 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bd5bf56af/2d7c0071d6e34cd99fbae12a9990e955/FLAG7adef110e [2021-05-02 19:07:18,428 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 19:07:18,429 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_6.c [2021-05-02 19:07:18,433 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bd5bf56af/2d7c0071d6e34cd99fbae12a9990e955/FLAG7adef110e [2021-05-02 19:07:18,448 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bd5bf56af/2d7c0071d6e34cd99fbae12a9990e955 [2021-05-02 19:07:18,450 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 19:07:18,453 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 19:07:18,454 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 19:07:18,455 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 19:07:18,457 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 19:07:18,458 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:07:18" (1/1) ... [2021-05-02 19:07:18,459 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61ef58dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:07:18, skipping insertion in model container [2021-05-02 19:07:18,459 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 07:07:18" (1/1) ... [2021-05-02 19:07:18,463 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 19:07:18,473 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 19:07:18,594 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_6.c[959,972] [2021-05-02 19:07:18,600 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:07:18,605 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 19:07:18,652 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-simple/nested_6.c[959,972] [2021-05-02 19:07:18,656 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 19:07:18,666 INFO L208 MainTranslator]: Completed translation [2021-05-02 19:07:18,667 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:07:18 WrapperNode [2021-05-02 19:07:18,667 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 19:07:18,669 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 19:07:18,669 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 19:07:18,669 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 19:07:18,677 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:07:18" (1/1) ... [2021-05-02 19:07:18,677 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:07:18" (1/1) ... [2021-05-02 19:07:18,682 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:07:18" (1/1) ... [2021-05-02 19:07:18,682 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:07:18" (1/1) ... [2021-05-02 19:07:18,691 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:07:18" (1/1) ... [2021-05-02 19:07:18,696 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:07:18" (1/1) ... [2021-05-02 19:07:18,699 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:07:18" (1/1) ... [2021-05-02 19:07:18,703 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 19:07:18,704 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 19:07:18,705 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 19:07:18,705 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 19:07:18,706 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:07:18" (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 19:07:18,828 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 19:07:18,829 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 19:07:18,829 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 19:07:18,829 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 19:07:18,829 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 19:07:18,829 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 19:07:18,829 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 19:07:18,830 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 19:07:18,830 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 19:07:18,830 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 19:07:18,830 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 19:07:18,830 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 19:07:18,830 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 19:07:18,830 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 19:07:19,068 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 19:07:19,069 INFO L299 CfgBuilder]: Removed 6 assume(true) statements. [2021-05-02 19:07:19,070 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:07:19 BoogieIcfgContainer [2021-05-02 19:07:19,070 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 19:07:19,070 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 19:07:19,070 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 19:07:19,085 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 19:07:19,087 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:07:19" (1/1) ... [2021-05-02 19:07:19,100 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:07:19 BasicIcfg [2021-05-02 19:07:19,101 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 19:07:19,102 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 19:07:19,102 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 19:07:19,104 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 19:07:19,104 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 07:07:18" (1/4) ... [2021-05-02 19:07:19,104 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16c9081d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:07:19, skipping insertion in model container [2021-05-02 19:07:19,104 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 07:07:18" (2/4) ... [2021-05-02 19:07:19,105 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16c9081d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 07:07:19, skipping insertion in model container [2021-05-02 19:07:19,105 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 07:07:19" (3/4) ... [2021-05-02 19:07:19,105 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16c9081d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 07:07:19, skipping insertion in model container [2021-05-02 19:07:19,105 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 07:07:19" (4/4) ... [2021-05-02 19:07:19,106 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_6.cJordan [2021-05-02 19:07:19,126 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 19:07:19,128 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 19:07:19,139 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 19:07:19,172 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 19:07:19,173 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 19:07:19,173 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 19:07:19,173 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 19:07:19,173 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 19:07:19,173 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 19:07:19,173 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 19:07:19,173 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 19:07:19,183 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 20 states have (on average 1.7) internal successors, (34), 21 states have internal predecessors, (34), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 19:07:19,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 19:07:19,191 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:19,192 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:19,192 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:19,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:19,196 INFO L82 PathProgramCache]: Analyzing trace with hash -453903611, now seen corresponding path program 1 times [2021-05-02 19:07:19,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:19,211 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368652226] [2021-05-02 19:07:19,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:19,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:19,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:19,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:19,350 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 19:07:19,351 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:19,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368652226] [2021-05-02 19:07:19,352 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368652226] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:07:19,352 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:07:19,352 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 19:07:19,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544919908] [2021-05-02 19:07:19,355 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 19:07:19,355 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:19,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 19:07:19,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:07:19,365 INFO L87 Difference]: Start difference. First operand has 26 states, 20 states have (on average 1.7) internal successors, (34), 21 states have internal predecessors, (34), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:19,386 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2021-05-02 19:07:19,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 19:07:19,388 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 19:07:19,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:19,392 INFO L225 Difference]: With dead ends: 26 [2021-05-02 19:07:19,392 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 19:07:19,393 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 25.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 19:07:19,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 19:07:19,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-02 19:07:19,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 17 states have internal predecessors, (23), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-05-02 19:07:19,413 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 9 [2021-05-02 19:07:19,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:19,413 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-05-02 19:07:19,413 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,414 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-05-02 19:07:19,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-05-02 19:07:19,414 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:19,414 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:19,414 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 19:07:19,414 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:19,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:19,415 INFO L82 PathProgramCache]: Analyzing trace with hash -453902650, now seen corresponding path program 1 times [2021-05-02 19:07:19,415 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:19,415 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1605707402] [2021-05-02 19:07:19,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:19,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:19,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:19,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:19,478 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 19:07:19,478 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:19,478 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1605707402] [2021-05-02 19:07:19,479 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1605707402] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:07:19,479 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:07:19,479 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:07:19,479 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324288382] [2021-05-02 19:07:19,480 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:07:19,480 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:19,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:07:19,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:07:19,481 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:19,538 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2021-05-02 19:07:19,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:07:19,539 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-05-02 19:07:19,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:19,540 INFO L225 Difference]: With dead ends: 33 [2021-05-02 19:07:19,540 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 19:07:19,540 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 41.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:07:19,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 19:07:19,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 22. [2021-05-02 19:07:19,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 18 states have internal predecessors, (24), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-05-02 19:07:19,544 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 9 [2021-05-02 19:07:19,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:19,544 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-05-02 19:07:19,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,544 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-05-02 19:07:19,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 19:07:19,544 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:19,545 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:19,545 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 19:07:19,545 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:19,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:19,545 INFO L82 PathProgramCache]: Analyzing trace with hash -1625207900, now seen corresponding path program 1 times [2021-05-02 19:07:19,546 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:19,546 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [240296224] [2021-05-02 19:07:19,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:19,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:19,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:19,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:19,596 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 19:07:19,597 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:19,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [240296224] [2021-05-02 19:07:19,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [240296224] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:07:19,597 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:07:19,597 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:07:19,597 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136949339] [2021-05-02 19:07:19,598 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:07:19,598 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:19,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:07:19,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:07:19,599 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:19,656 INFO L93 Difference]: Finished difference Result 32 states and 41 transitions. [2021-05-02 19:07:19,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:07:19,657 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 19:07:19,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:19,658 INFO L225 Difference]: With dead ends: 32 [2021-05-02 19:07:19,658 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 19:07:19,658 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 41.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:07:19,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 19:07:19,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 23. [2021-05-02 19:07:19,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 19 states have internal predecessors, (25), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2021-05-02 19:07:19,661 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 12 [2021-05-02 19:07:19,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:19,661 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2021-05-02 19:07:19,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,661 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2021-05-02 19:07:19,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 19:07:19,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:19,662 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:19,662 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 19:07:19,662 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:19,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:19,663 INFO L82 PathProgramCache]: Analyzing trace with hash 253027865, now seen corresponding path program 1 times [2021-05-02 19:07:19,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:19,663 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315735261] [2021-05-02 19:07:19,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:19,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:19,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:19,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:19,711 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:07:19,712 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:19,712 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315735261] [2021-05-02 19:07:19,712 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1315735261] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:07:19,712 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:07:19,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:07:19,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728963046] [2021-05-02 19:07:19,713 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:07:19,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:19,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:07:19,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:07:19,714 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:19,779 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2021-05-02 19:07:19,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:07:19,780 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 19:07:19,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:19,780 INFO L225 Difference]: With dead ends: 31 [2021-05-02 19:07:19,780 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 19:07:19,781 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:07:19,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 19:07:19,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2021-05-02 19:07:19,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 20 states have (on average 1.3) internal successors, (26), 20 states have internal predecessors, (26), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-05-02 19:07:19,783 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 15 [2021-05-02 19:07:19,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:19,783 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-05-02 19:07:19,784 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,784 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-05-02 19:07:19,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 19:07:19,784 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:19,784 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:19,784 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 19:07:19,784 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:19,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:19,785 INFO L82 PathProgramCache]: Analyzing trace with hash 1606013432, now seen corresponding path program 1 times [2021-05-02 19:07:19,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:19,785 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1367299064] [2021-05-02 19:07:19,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:19,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:19,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:19,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:19,829 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:07:19,829 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:19,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1367299064] [2021-05-02 19:07:19,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1367299064] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:07:19,830 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:07:19,830 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:07:19,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351437819] [2021-05-02 19:07:19,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:07:19,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:19,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:07:19,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:07:19,831 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:19,880 INFO L93 Difference]: Finished difference Result 30 states and 37 transitions. [2021-05-02 19:07:19,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:07:19,881 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2021-05-02 19:07:19,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:19,881 INFO L225 Difference]: With dead ends: 30 [2021-05-02 19:07:19,881 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 19:07:19,882 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 36.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:07:19,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 19:07:19,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2021-05-02 19:07:19,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2021-05-02 19:07:19,884 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 18 [2021-05-02 19:07:19,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:19,884 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2021-05-02 19:07:19,885 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,885 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2021-05-02 19:07:19,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 19:07:19,885 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:19,885 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:19,885 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 19:07:19,885 INFO L428 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:19,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:19,886 INFO L82 PathProgramCache]: Analyzing trace with hash -1004020784, now seen corresponding path program 1 times [2021-05-02 19:07:19,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:19,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166759103] [2021-05-02 19:07:19,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:19,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:19,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:19,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:19,926 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:07:19,927 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:19,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1166759103] [2021-05-02 19:07:19,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1166759103] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:07:19,927 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:07:19,927 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:07:19,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497340814] [2021-05-02 19:07:19,928 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:07:19,928 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:19,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:07:19,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:07:19,929 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:19,976 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2021-05-02 19:07:19,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:07:19,976 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 19:07:19,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:19,977 INFO L225 Difference]: With dead ends: 29 [2021-05-02 19:07:19,977 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 19:07:19,977 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:07:19,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 19:07:19,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2021-05-02 19:07:19,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 22 states have (on average 1.2727272727272727) internal successors, (28), 22 states have internal predecessors, (28), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-05-02 19:07:19,979 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 21 [2021-05-02 19:07:19,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:19,980 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-05-02 19:07:19,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:19,980 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-05-02 19:07:19,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 19:07:19,980 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:19,980 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:19,981 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 19:07:19,981 INFO L428 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:19,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:19,981 INFO L82 PathProgramCache]: Analyzing trace with hash -376043024, now seen corresponding path program 1 times [2021-05-02 19:07:19,981 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:19,981 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711604979] [2021-05-02 19:07:19,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:19,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:20,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:20,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:20,021 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:07:20,021 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:20,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711604979] [2021-05-02 19:07:20,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711604979] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 19:07:20,021 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 19:07:20,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 19:07:20,022 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595849676] [2021-05-02 19:07:20,022 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 19:07:20,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:20,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 19:07:20,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 19:07:20,023 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:20,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:20,068 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2021-05-02 19:07:20,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 19:07:20,069 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 24 [2021-05-02 19:07:20,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:20,069 INFO L225 Difference]: With dead ends: 28 [2021-05-02 19:07:20,069 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 19:07:20,069 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 33.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 19:07:20,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 19:07:20,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-02 19:07:20,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:20,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2021-05-02 19:07:20,071 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 24 [2021-05-02 19:07:20,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:20,072 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2021-05-02 19:07:20,072 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 5.25) internal successors, (21), 3 states have internal predecessors, (21), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:20,072 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2021-05-02 19:07:20,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 19:07:20,072 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:20,072 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:20,072 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 19:07:20,072 INFO L428 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:20,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:20,073 INFO L82 PathProgramCache]: Analyzing trace with hash 360219758, now seen corresponding path program 1 times [2021-05-02 19:07:20,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:20,073 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649562078] [2021-05-02 19:07:20,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:20,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:20,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:20,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:20,113 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:07:20,113 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:20,113 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649562078] [2021-05-02 19:07:20,113 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649562078] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:20,113 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335903490] [2021-05-02 19:07:20,114 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 19:07:20,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:20,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 19:07:20,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:20,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:20,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:20,283 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:07:20,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1335903490] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:20,283 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:20,283 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 19:07:20,284 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085550867] [2021-05-02 19:07:20,284 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 19:07:20,284 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:20,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 19:07:20,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 19:07:20,285 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 5 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:20,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:20,362 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2021-05-02 19:07:20,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 19:07:20,363 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 5 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 19:07:20,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:20,363 INFO L225 Difference]: With dead ends: 30 [2021-05-02 19:07:20,363 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 19:07:20,363 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 58.9ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:07:20,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 19:07:20,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-05-02 19:07:20,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:20,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2021-05-02 19:07:20,365 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 26 [2021-05-02 19:07:20,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:20,366 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2021-05-02 19:07:20,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 5 states have internal predecessors, (27), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:20,366 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2021-05-02 19:07:20,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 19:07:20,366 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:20,366 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:20,573 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-05-02 19:07:20,573 INFO L428 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:20,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:20,574 INFO L82 PathProgramCache]: Analyzing trace with hash -760850580, now seen corresponding path program 2 times [2021-05-02 19:07:20,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:20,574 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311721446] [2021-05-02 19:07:20,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:20,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:20,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:20,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:20,634 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 19:07:20,635 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:20,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311721446] [2021-05-02 19:07:20,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311721446] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:20,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [53328465] [2021-05-02 19:07:20,635 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 19:07:20,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:07:20,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:20,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 19:07:20,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:20,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:20,738 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:20,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:20,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:20,768 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 19:07:20,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [53328465] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:20,768 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:20,768 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-05-02 19:07:20,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685448048] [2021-05-02 19:07:20,769 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:07:20,769 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:20,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:07:20,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:07:20,769 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:21,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:21,076 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2021-05-02 19:07:21,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 19:07:21,076 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2021-05-02 19:07:21,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:21,077 INFO L225 Difference]: With dead ends: 51 [2021-05-02 19:07:21,077 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 19:07:21,077 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 261.3ms TimeCoverageRelationStatistics Valid=117, Invalid=225, Unknown=0, NotChecked=0, Total=342 [2021-05-02 19:07:21,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 19:07:21,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 40. [2021-05-02 19:07:21,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 36 states have internal predecessors, (43), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:21,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-05-02 19:07:21,080 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 28 [2021-05-02 19:07:21,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:21,080 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-05-02 19:07:21,080 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 7 states have internal predecessors, (33), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:21,080 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-05-02 19:07:21,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 19:07:21,081 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:21,081 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:21,297 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:07:21,297 INFO L428 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:21,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:21,298 INFO L82 PathProgramCache]: Analyzing trace with hash 296040720, now seen corresponding path program 3 times [2021-05-02 19:07:21,298 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:21,298 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491693743] [2021-05-02 19:07:21,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:21,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:21,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:21,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:21,369 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-05-02 19:07:21,369 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:21,369 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491693743] [2021-05-02 19:07:21,369 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491693743] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:21,369 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497302264] [2021-05-02 19:07:21,369 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 19:07:21,465 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 19:07:21,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:21,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 19:07:21,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:21,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:21,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:21,523 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-05-02 19:07:21,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1497302264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:21,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:21,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2021-05-02 19:07:21,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500493167] [2021-05-02 19:07:21,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:07:21,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:21,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:07:21,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:07:21,524 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 6 states have internal predecessors, (43), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:21,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:21,747 INFO L93 Difference]: Finished difference Result 222 states and 258 transitions. [2021-05-02 19:07:21,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 19:07:21,747 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 6 states have internal predecessors, (43), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 19:07:21,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:21,748 INFO L225 Difference]: With dead ends: 222 [2021-05-02 19:07:21,749 INFO L226 Difference]: Without dead ends: 222 [2021-05-02 19:07:21,749 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 177.8ms TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2021-05-02 19:07:21,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-05-02 19:07:21,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 112. [2021-05-02 19:07:21,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 108 states have (on average 1.1759259259259258) internal successors, (127), 108 states have internal predecessors, (127), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:21,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 130 transitions. [2021-05-02 19:07:21,755 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 130 transitions. Word has length 39 [2021-05-02 19:07:21,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:21,755 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 130 transitions. [2021-05-02 19:07:21,755 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 6.142857142857143) internal successors, (43), 6 states have internal predecessors, (43), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:21,755 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 130 transitions. [2021-05-02 19:07:21,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-02 19:07:21,756 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:21,756 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 8, 8, 8, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:21,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 19:07:21,964 INFO L428 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:21,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:21,965 INFO L82 PathProgramCache]: Analyzing trace with hash -2059999866, now seen corresponding path program 4 times [2021-05-02 19:07:21,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:21,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803608793] [2021-05-02 19:07:21,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:21,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:22,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:22,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:22,089 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 475 proven. 1 refuted. 0 times theorem prover too weak. 429 trivial. 0 not checked. [2021-05-02 19:07:22,090 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:22,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803608793] [2021-05-02 19:07:22,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803608793] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:22,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710790231] [2021-05-02 19:07:22,090 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 19:07:22,172 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:07:22,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:22,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 19:07:22,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:22,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:22,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:22,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:22,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:22,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:22,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:22,309 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 199 proven. 9 refuted. 0 times theorem prover too weak. 697 trivial. 0 not checked. [2021-05-02 19:07:22,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710790231] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:22,310 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:22,310 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 9 [2021-05-02 19:07:22,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084198122] [2021-05-02 19:07:22,310 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:07:22,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:22,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:07:22,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:07:22,311 INFO L87 Difference]: Start difference. First operand 112 states and 130 transitions. Second operand has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 8 states have internal predecessors, (49), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:22,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:22,721 INFO L93 Difference]: Finished difference Result 362 states and 408 transitions. [2021-05-02 19:07:22,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 19:07:22,722 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 8 states have internal predecessors, (49), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 111 [2021-05-02 19:07:22,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:22,723 INFO L225 Difference]: With dead ends: 362 [2021-05-02 19:07:22,723 INFO L226 Difference]: Without dead ends: 362 [2021-05-02 19:07:22,723 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 328.0ms TimeCoverageRelationStatistics Valid=170, Invalid=336, Unknown=0, NotChecked=0, Total=506 [2021-05-02 19:07:22,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2021-05-02 19:07:22,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 234. [2021-05-02 19:07:22,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 234 states, 230 states have (on average 1.1434782608695653) internal successors, (263), 230 states have internal predecessors, (263), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:22,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 266 transitions. [2021-05-02 19:07:22,732 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 266 transitions. Word has length 111 [2021-05-02 19:07:22,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:22,732 INFO L480 AbstractCegarLoop]: Abstraction has 234 states and 266 transitions. [2021-05-02 19:07:22,732 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 5.444444444444445) internal successors, (49), 8 states have internal predecessors, (49), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:22,732 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 266 transitions. [2021-05-02 19:07:22,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 234 [2021-05-02 19:07:22,734 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:22,734 INFO L523 BasicCegarLoop]: trace histogram [64, 64, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:22,952 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:07:22,952 INFO L428 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:22,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:22,953 INFO L82 PathProgramCache]: Analyzing trace with hash 1486323244, now seen corresponding path program 5 times [2021-05-02 19:07:22,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:22,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240836681] [2021-05-02 19:07:22,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:22,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:23,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:23,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:23,021 INFO L134 CoverageAnalysis]: Checked inductivity of 5698 backedges. 2904 proven. 1 refuted. 0 times theorem prover too weak. 2793 trivial. 0 not checked. [2021-05-02 19:07:23,021 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:23,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240836681] [2021-05-02 19:07:23,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240836681] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:23,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448547695] [2021-05-02 19:07:23,021 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 19:07:23,065 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 19:07:23,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:23,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 19:07:23,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:23,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:23,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:23,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:23,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:23,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:23,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:23,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:23,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:23,359 INFO L134 CoverageAnalysis]: Checked inductivity of 5698 backedges. 2646 proven. 16 refuted. 0 times theorem prover too weak. 3036 trivial. 0 not checked. [2021-05-02 19:07:23,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448547695] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:23,359 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:23,359 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7] total 10 [2021-05-02 19:07:23,359 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133031743] [2021-05-02 19:07:23,360 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:07:23,360 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:23,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:07:23,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:07:23,361 INFO L87 Difference]: Start difference. First operand 234 states and 266 transitions. Second operand has 10 states, 10 states have (on average 6.3) internal successors, (63), 9 states have internal predecessors, (63), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:23,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:23,775 INFO L93 Difference]: Finished difference Result 812 states and 904 transitions. [2021-05-02 19:07:23,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 19:07:23,797 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 6.3) internal successors, (63), 9 states have internal predecessors, (63), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 233 [2021-05-02 19:07:23,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:23,799 INFO L225 Difference]: With dead ends: 812 [2021-05-02 19:07:23,799 INFO L226 Difference]: Without dead ends: 812 [2021-05-02 19:07:23,800 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 232 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 357.4ms TimeCoverageRelationStatistics Valid=233, Invalid=469, Unknown=0, NotChecked=0, Total=702 [2021-05-02 19:07:23,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 812 states. [2021-05-02 19:07:23,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 812 to 516. [2021-05-02 19:07:23,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 516 states, 512 states have (on average 1.123046875) internal successors, (575), 512 states have internal predecessors, (575), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:23,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 516 states to 516 states and 578 transitions. [2021-05-02 19:07:23,813 INFO L78 Accepts]: Start accepts. Automaton has 516 states and 578 transitions. Word has length 233 [2021-05-02 19:07:23,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:23,814 INFO L480 AbstractCegarLoop]: Abstraction has 516 states and 578 transitions. [2021-05-02 19:07:23,814 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 6.3) internal successors, (63), 9 states have internal predecessors, (63), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:23,814 INFO L276 IsEmpty]: Start isEmpty. Operand 516 states and 578 transitions. [2021-05-02 19:07:23,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 516 [2021-05-02 19:07:23,819 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:23,820 INFO L523 BasicCegarLoop]: trace histogram [160, 160, 32, 32, 32, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:24,036 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 19:07:24,036 INFO L428 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:24,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:24,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1910501498, now seen corresponding path program 6 times [2021-05-02 19:07:24,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:24,037 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1492894285] [2021-05-02 19:07:24,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:24,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:24,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:24,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:24,254 INFO L134 CoverageAnalysis]: Checked inductivity of 33195 backedges. 1979 proven. 25 refuted. 0 times theorem prover too weak. 31191 trivial. 0 not checked. [2021-05-02 19:07:24,254 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:24,254 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1492894285] [2021-05-02 19:07:24,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1492894285] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:24,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [988258412] [2021-05-02 19:07:24,255 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 19:07:24,381 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 12 check-sat command(s) [2021-05-02 19:07:24,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:24,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 19:07:24,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:24,513 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:24,515 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:24,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:24,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:24,529 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:24,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:24,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:24,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:24,542 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:24,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:24,881 INFO L134 CoverageAnalysis]: Checked inductivity of 33195 backedges. 12889 proven. 25 refuted. 0 times theorem prover too weak. 20281 trivial. 0 not checked. [2021-05-02 19:07:24,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [988258412] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:24,881 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:24,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 19:07:24,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166658100] [2021-05-02 19:07:24,883 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:07:24,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:24,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:07:24,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:07:24,883 INFO L87 Difference]: Start difference. First operand 516 states and 578 transitions. Second operand has 10 states, 10 states have (on average 5.2) internal successors, (52), 9 states have internal predecessors, (52), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:25,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:25,053 INFO L93 Difference]: Finished difference Result 580 states and 642 transitions. [2021-05-02 19:07:25,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:07:25,054 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 5.2) internal successors, (52), 9 states have internal predecessors, (52), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 515 [2021-05-02 19:07:25,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:25,056 INFO L225 Difference]: With dead ends: 580 [2021-05-02 19:07:25,056 INFO L226 Difference]: Without dead ends: 580 [2021-05-02 19:07:25,057 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 516 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 146.8ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:07:25,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-05-02 19:07:25,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 580. [2021-05-02 19:07:25,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 580 states, 576 states have (on average 1.109375) internal successors, (639), 576 states have internal predecessors, (639), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:25,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 580 states to 580 states and 642 transitions. [2021-05-02 19:07:25,072 INFO L78 Accepts]: Start accepts. Automaton has 580 states and 642 transitions. Word has length 515 [2021-05-02 19:07:25,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:25,073 INFO L480 AbstractCegarLoop]: Abstraction has 580 states and 642 transitions. [2021-05-02 19:07:25,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 5.2) internal successors, (52), 9 states have internal predecessors, (52), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:25,074 INFO L276 IsEmpty]: Start isEmpty. Operand 580 states and 642 transitions. [2021-05-02 19:07:25,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 580 [2021-05-02 19:07:25,079 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:25,079 INFO L523 BasicCegarLoop]: trace histogram [192, 192, 32, 32, 32, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:25,298 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:07:25,298 INFO L428 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:25,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:25,298 INFO L82 PathProgramCache]: Analyzing trace with hash 2113980294, now seen corresponding path program 7 times [2021-05-02 19:07:25,298 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:25,299 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106260109] [2021-05-02 19:07:25,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:25,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:25,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:25,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:25,400 INFO L134 CoverageAnalysis]: Checked inductivity of 45451 backedges. 5336 proven. 89 refuted. 0 times theorem prover too weak. 40026 trivial. 0 not checked. [2021-05-02 19:07:25,400 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:25,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106260109] [2021-05-02 19:07:25,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [106260109] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:25,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889807038] [2021-05-02 19:07:25,401 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 19:07:25,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:25,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 1036 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 19:07:25,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:25,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:25,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:25,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:25,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:26,038 INFO L134 CoverageAnalysis]: Checked inductivity of 45451 backedges. 5336 proven. 89 refuted. 0 times theorem prover too weak. 40026 trivial. 0 not checked. [2021-05-02 19:07:26,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [889807038] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:26,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:26,038 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 19:07:26,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141385140] [2021-05-02 19:07:26,039 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:07:26,039 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:26,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:07:26,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:07:26,040 INFO L87 Difference]: Start difference. First operand 580 states and 642 transitions. Second operand has 7 states, 7 states have (on average 6.428571428571429) internal successors, (45), 6 states have internal predecessors, (45), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:26,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:26,135 INFO L93 Difference]: Finished difference Result 1044 states and 1138 transitions. [2021-05-02 19:07:26,135 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 19:07:26,135 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.428571428571429) internal successors, (45), 6 states have internal predecessors, (45), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 579 [2021-05-02 19:07:26,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:26,138 INFO L225 Difference]: With dead ends: 1044 [2021-05-02 19:07:26,138 INFO L226 Difference]: Without dead ends: 1044 [2021-05-02 19:07:26,138 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 588 GetRequests, 580 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 69.6ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:07:26,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1044 states. [2021-05-02 19:07:26,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1044 to 820. [2021-05-02 19:07:26,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 820 states, 816 states have (on average 1.0968137254901962) internal successors, (895), 816 states have internal predecessors, (895), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:26,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 820 states to 820 states and 898 transitions. [2021-05-02 19:07:26,149 INFO L78 Accepts]: Start accepts. Automaton has 820 states and 898 transitions. Word has length 579 [2021-05-02 19:07:26,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:26,149 INFO L480 AbstractCegarLoop]: Abstraction has 820 states and 898 transitions. [2021-05-02 19:07:26,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 6.428571428571429) internal successors, (45), 6 states have internal predecessors, (45), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:26,149 INFO L276 IsEmpty]: Start isEmpty. Operand 820 states and 898 transitions. [2021-05-02 19:07:26,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 820 [2021-05-02 19:07:26,159 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:26,159 INFO L523 BasicCegarLoop]: trace histogram [288, 288, 48, 48, 48, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:26,375 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 19:07:26,376 INFO L428 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:26,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:26,376 INFO L82 PathProgramCache]: Analyzing trace with hash 530381190, now seen corresponding path program 8 times [2021-05-02 19:07:26,376 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:26,376 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211489441] [2021-05-02 19:07:26,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:26,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:26,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:26,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:26,545 INFO L134 CoverageAnalysis]: Checked inductivity of 101267 backedges. 11891 proven. 264 refuted. 0 times theorem prover too weak. 89112 trivial. 0 not checked. [2021-05-02 19:07:26,545 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:26,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [211489441] [2021-05-02 19:07:26,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [211489441] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:26,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717467380] [2021-05-02 19:07:26,546 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 19:07:26,799 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:07:26,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:26,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 1420 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 19:07:26,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:26,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:26,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:26,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:26,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:26,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:26,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:27,428 INFO L134 CoverageAnalysis]: Checked inductivity of 101267 backedges. 11891 proven. 264 refuted. 0 times theorem prover too weak. 89112 trivial. 0 not checked. [2021-05-02 19:07:27,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717467380] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:27,428 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:27,428 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 19:07:27,428 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442068397] [2021-05-02 19:07:27,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:07:27,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:27,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:07:27,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:07:27,430 INFO L87 Difference]: Start difference. First operand 820 states and 898 transitions. Second operand has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:27,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:27,557 INFO L93 Difference]: Finished difference Result 1284 states and 1394 transitions. [2021-05-02 19:07:27,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:07:27,558 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 819 [2021-05-02 19:07:27,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:27,561 INFO L225 Difference]: With dead ends: 1284 [2021-05-02 19:07:27,561 INFO L226 Difference]: Without dead ends: 1284 [2021-05-02 19:07:27,563 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 830 GetRequests, 820 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 89.3ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:07:27,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1284 states. [2021-05-02 19:07:27,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1284 to 1060. [2021-05-02 19:07:27,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1060 states, 1056 states have (on average 1.089962121212121) internal successors, (1151), 1056 states have internal predecessors, (1151), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:27,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1060 states to 1060 states and 1154 transitions. [2021-05-02 19:07:27,578 INFO L78 Accepts]: Start accepts. Automaton has 1060 states and 1154 transitions. Word has length 819 [2021-05-02 19:07:27,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:27,578 INFO L480 AbstractCegarLoop]: Abstraction has 1060 states and 1154 transitions. [2021-05-02 19:07:27,579 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 6.25) internal successors, (50), 7 states have internal predecessors, (50), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:27,580 INFO L276 IsEmpty]: Start isEmpty. Operand 1060 states and 1154 transitions. [2021-05-02 19:07:27,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1060 [2021-05-02 19:07:27,600 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:27,601 INFO L523 BasicCegarLoop]: trace histogram [384, 384, 64, 64, 64, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:27,821 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 19:07:27,821 INFO L428 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:27,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:27,821 INFO L82 PathProgramCache]: Analyzing trace with hash 464006022, now seen corresponding path program 9 times [2021-05-02 19:07:27,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:27,822 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1506860469] [2021-05-02 19:07:27,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:27,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:28,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:28,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:28,095 INFO L134 CoverageAnalysis]: Checked inductivity of 179355 backedges. 21056 proven. 526 refuted. 0 times theorem prover too weak. 157773 trivial. 0 not checked. [2021-05-02 19:07:28,096 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:28,096 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1506860469] [2021-05-02 19:07:28,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1506860469] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:28,096 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1697491021] [2021-05-02 19:07:28,096 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 19:07:28,272 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2021-05-02 19:07:28,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:28,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 19:07:28,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:29,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:29,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:29,164 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:29,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:29,179 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:29,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:29,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:29,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:29,208 INFO L134 CoverageAnalysis]: Checked inductivity of 179355 backedges. 21082 proven. 526 refuted. 0 times theorem prover too weak. 157747 trivial. 0 not checked. [2021-05-02 19:07:29,208 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1697491021] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:29,208 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:29,208 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 19:07:29,209 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703886412] [2021-05-02 19:07:29,209 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:07:29,209 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:29,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:07:29,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:07:29,210 INFO L87 Difference]: Start difference. First operand 1060 states and 1154 transitions. Second operand has 9 states, 9 states have (on average 7.666666666666667) internal successors, (69), 8 states have internal predecessors, (69), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:29,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:29,356 INFO L93 Difference]: Finished difference Result 1524 states and 1650 transitions. [2021-05-02 19:07:29,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 19:07:29,357 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 7.666666666666667) internal successors, (69), 8 states have internal predecessors, (69), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 1059 [2021-05-02 19:07:29,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:29,360 INFO L225 Difference]: With dead ends: 1524 [2021-05-02 19:07:29,360 INFO L226 Difference]: Without dead ends: 1524 [2021-05-02 19:07:29,361 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1072 GetRequests, 1060 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 109.9ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:07:29,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1524 states. [2021-05-02 19:07:29,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1524 to 1300. [2021-05-02 19:07:29,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1300 states, 1296 states have (on average 1.0856481481481481) internal successors, (1407), 1296 states have internal predecessors, (1407), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:29,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1300 states to 1300 states and 1410 transitions. [2021-05-02 19:07:29,378 INFO L78 Accepts]: Start accepts. Automaton has 1300 states and 1410 transitions. Word has length 1059 [2021-05-02 19:07:29,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:29,379 INFO L480 AbstractCegarLoop]: Abstraction has 1300 states and 1410 transitions. [2021-05-02 19:07:29,379 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 7.666666666666667) internal successors, (69), 8 states have internal predecessors, (69), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:29,379 INFO L276 IsEmpty]: Start isEmpty. Operand 1300 states and 1410 transitions. [2021-05-02 19:07:29,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1300 [2021-05-02 19:07:29,393 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:29,394 INFO L523 BasicCegarLoop]: trace histogram [480, 480, 80, 80, 80, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:29,610 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 19:07:29,610 INFO L428 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:29,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:29,611 INFO L82 PathProgramCache]: Analyzing trace with hash 597843334, now seen corresponding path program 10 times [2021-05-02 19:07:29,611 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:29,611 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483491403] [2021-05-02 19:07:29,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:29,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:29,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:29,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:29,870 INFO L134 CoverageAnalysis]: Checked inductivity of 279715 backedges. 32831 proven. 875 refuted. 0 times theorem prover too weak. 246009 trivial. 0 not checked. [2021-05-02 19:07:29,871 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:29,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483491403] [2021-05-02 19:07:29,871 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [483491403] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:29,871 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60577423] [2021-05-02 19:07:29,871 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 19:07:30,257 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:07:30,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:30,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 2159 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 19:07:30,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:30,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:30,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:30,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:30,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:30,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:30,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:30,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:30,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:30,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:30,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:31,271 INFO L134 CoverageAnalysis]: Checked inductivity of 279715 backedges. 32831 proven. 875 refuted. 0 times theorem prover too weak. 246009 trivial. 0 not checked. [2021-05-02 19:07:31,272 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60577423] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:31,272 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:31,272 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 19:07:31,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561746164] [2021-05-02 19:07:31,273 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:07:31,273 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:31,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:07:31,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:07:31,274 INFO L87 Difference]: Start difference. First operand 1300 states and 1410 transitions. Second operand has 10 states, 10 states have (on average 6.0) internal successors, (60), 9 states have internal predecessors, (60), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:31,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:31,450 INFO L93 Difference]: Finished difference Result 1540 states and 1666 transitions. [2021-05-02 19:07:31,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:07:31,450 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 6.0) internal successors, (60), 9 states have internal predecessors, (60), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 1299 [2021-05-02 19:07:31,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:31,453 INFO L225 Difference]: With dead ends: 1540 [2021-05-02 19:07:31,453 INFO L226 Difference]: Without dead ends: 1540 [2021-05-02 19:07:31,454 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1314 GetRequests, 1300 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 136.2ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:07:31,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1540 states. [2021-05-02 19:07:31,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1540 to 1540. [2021-05-02 19:07:31,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1540 states, 1536 states have (on average 1.0826822916666667) internal successors, (1663), 1536 states have internal predecessors, (1663), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:31,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1540 states to 1540 states and 1666 transitions. [2021-05-02 19:07:31,471 INFO L78 Accepts]: Start accepts. Automaton has 1540 states and 1666 transitions. Word has length 1299 [2021-05-02 19:07:31,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:31,471 INFO L480 AbstractCegarLoop]: Abstraction has 1540 states and 1666 transitions. [2021-05-02 19:07:31,471 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 6.0) internal successors, (60), 9 states have internal predecessors, (60), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:31,471 INFO L276 IsEmpty]: Start isEmpty. Operand 1540 states and 1666 transitions. [2021-05-02 19:07:31,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1540 [2021-05-02 19:07:31,486 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:31,486 INFO L523 BasicCegarLoop]: trace histogram [576, 576, 96, 96, 96, 16, 16, 16, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:31,701 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 19:07:31,701 INFO L428 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:31,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:31,702 INFO L82 PathProgramCache]: Analyzing trace with hash 883658630, now seen corresponding path program 11 times [2021-05-02 19:07:31,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:31,702 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611202363] [2021-05-02 19:07:31,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:31,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:32,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:32,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:32,034 INFO L134 CoverageAnalysis]: Checked inductivity of 402347 backedges. 88169 proven. 3149 refuted. 0 times theorem prover too weak. 311029 trivial. 0 not checked. [2021-05-02 19:07:32,034 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:32,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611202363] [2021-05-02 19:07:32,034 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611202363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:32,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1340107241] [2021-05-02 19:07:32,034 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 19:07:32,268 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 69 check-sat command(s) [2021-05-02 19:07:32,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:32,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 494 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 19:07:32,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:32,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:32,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:32,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:32,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:33,617 INFO L134 CoverageAnalysis]: Checked inductivity of 402347 backedges. 214138 proven. 3149 refuted. 0 times theorem prover too weak. 185060 trivial. 0 not checked. [2021-05-02 19:07:33,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1340107241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:33,618 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:33,618 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 19:07:33,618 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663487688] [2021-05-02 19:07:33,619 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:07:33,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:33,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:07:33,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:07:33,620 INFO L87 Difference]: Start difference. First operand 1540 states and 1666 transitions. Second operand has 7 states, 7 states have (on average 9.428571428571429) internal successors, (66), 6 states have internal predecessors, (66), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:33,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:33,733 INFO L93 Difference]: Finished difference Result 3020 states and 3258 transitions. [2021-05-02 19:07:33,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 19:07:33,734 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 9.428571428571429) internal successors, (66), 6 states have internal predecessors, (66), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 1539 [2021-05-02 19:07:33,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:33,740 INFO L225 Difference]: With dead ends: 3020 [2021-05-02 19:07:33,740 INFO L226 Difference]: Without dead ends: 3020 [2021-05-02 19:07:33,740 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 1548 GetRequests, 1540 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 77.0ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:07:33,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3020 states. [2021-05-02 19:07:33,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3020 to 2284. [2021-05-02 19:07:33,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2284 states, 2280 states have (on average 1.0802631578947368) internal successors, (2463), 2280 states have internal predecessors, (2463), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:33,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2284 states to 2284 states and 2466 transitions. [2021-05-02 19:07:33,768 INFO L78 Accepts]: Start accepts. Automaton has 2284 states and 2466 transitions. Word has length 1539 [2021-05-02 19:07:33,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:33,768 INFO L480 AbstractCegarLoop]: Abstraction has 2284 states and 2466 transitions. [2021-05-02 19:07:33,768 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 9.428571428571429) internal successors, (66), 6 states have internal predecessors, (66), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:33,768 INFO L276 IsEmpty]: Start isEmpty. Operand 2284 states and 2466 transitions. [2021-05-02 19:07:33,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2284 [2021-05-02 19:07:33,800 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:33,800 INFO L523 BasicCegarLoop]: trace histogram [864, 864, 144, 144, 144, 24, 24, 24, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:34,019 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 19:07:34,019 INFO L428 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:34,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:34,020 INFO L82 PathProgramCache]: Analyzing trace with hash 1834472070, now seen corresponding path program 12 times [2021-05-02 19:07:34,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:34,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806296497] [2021-05-02 19:07:34,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:34,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:34,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:34,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:34,840 INFO L134 CoverageAnalysis]: Checked inductivity of 905559 backedges. 198328 proven. 9444 refuted. 0 times theorem prover too weak. 697787 trivial. 0 not checked. [2021-05-02 19:07:34,840 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:34,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806296497] [2021-05-02 19:07:34,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [806296497] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:34,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235795503] [2021-05-02 19:07:34,841 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 19:07:35,603 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 195 check-sat command(s) [2021-05-02 19:07:35,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:35,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 1195 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 19:07:35,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:37,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:37,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:37,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:37,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:37,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:37,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:37,927 INFO L134 CoverageAnalysis]: Checked inductivity of 905559 backedges. 198339 proven. 9444 refuted. 0 times theorem prover too weak. 697776 trivial. 0 not checked. [2021-05-02 19:07:37,928 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235795503] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:37,928 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:37,928 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 19:07:37,928 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834547408] [2021-05-02 19:07:37,929 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:07:37,929 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:37,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:07:37,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:07:37,930 INFO L87 Difference]: Start difference. First operand 2284 states and 2466 transitions. Second operand has 8 states, 8 states have (on average 9.5) internal successors, (76), 7 states have internal predecessors, (76), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:38,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:38,065 INFO L93 Difference]: Finished difference Result 3764 states and 4058 transitions. [2021-05-02 19:07:38,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:07:38,065 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 9.5) internal successors, (76), 7 states have internal predecessors, (76), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 2283 [2021-05-02 19:07:38,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:38,073 INFO L225 Difference]: With dead ends: 3764 [2021-05-02 19:07:38,073 INFO L226 Difference]: Without dead ends: 3764 [2021-05-02 19:07:38,073 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 2294 GetRequests, 2284 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 88.6ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:07:38,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3764 states. [2021-05-02 19:07:38,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3764 to 3028. [2021-05-02 19:07:38,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3028 states, 3024 states have (on average 1.0790343915343916) internal successors, (3263), 3024 states have internal predecessors, (3263), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:38,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3028 states to 3028 states and 3266 transitions. [2021-05-02 19:07:38,115 INFO L78 Accepts]: Start accepts. Automaton has 3028 states and 3266 transitions. Word has length 2283 [2021-05-02 19:07:38,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:38,115 INFO L480 AbstractCegarLoop]: Abstraction has 3028 states and 3266 transitions. [2021-05-02 19:07:38,115 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 9.5) internal successors, (76), 7 states have internal predecessors, (76), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:38,116 INFO L276 IsEmpty]: Start isEmpty. Operand 3028 states and 3266 transitions. [2021-05-02 19:07:38,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3028 [2021-05-02 19:07:38,169 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:38,170 INFO L523 BasicCegarLoop]: trace histogram [1152, 1152, 192, 192, 192, 32, 32, 32, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:38,385 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:07:38,385 INFO L428 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:38,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:38,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1400227206, now seen corresponding path program 13 times [2021-05-02 19:07:38,386 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:38,386 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [523837994] [2021-05-02 19:07:38,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:38,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:39,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:39,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:39,919 INFO L134 CoverageAnalysis]: Checked inductivity of 1610179 backedges. 352545 proven. 18886 refuted. 0 times theorem prover too weak. 1238748 trivial. 0 not checked. [2021-05-02 19:07:39,919 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:39,919 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [523837994] [2021-05-02 19:07:39,919 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [523837994] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:39,919 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247051662] [2021-05-02 19:07:39,920 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 19:07:40,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:40,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 4972 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 19:07:40,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:40,752 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:40,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:40,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:40,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:40,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:40,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:41,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:41,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:42,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1610179 backedges. 352545 proven. 18886 refuted. 0 times theorem prover too weak. 1238748 trivial. 0 not checked. [2021-05-02 19:07:42,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1247051662] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:42,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:42,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 19:07:42,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330274581] [2021-05-02 19:07:42,864 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:07:42,864 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:42,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:07:42,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:07:42,864 INFO L87 Difference]: Start difference. First operand 3028 states and 3266 transitions. Second operand has 9 states, 9 states have (on average 7.666666666666667) internal successors, (69), 8 states have internal predecessors, (69), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:43,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:43,032 INFO L93 Difference]: Finished difference Result 4508 states and 4858 transitions. [2021-05-02 19:07:43,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 19:07:43,032 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 7.666666666666667) internal successors, (69), 8 states have internal predecessors, (69), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 3027 [2021-05-02 19:07:43,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:43,041 INFO L225 Difference]: With dead ends: 4508 [2021-05-02 19:07:43,041 INFO L226 Difference]: Without dead ends: 4508 [2021-05-02 19:07:43,042 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 3040 GetRequests, 3028 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 118.4ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:07:43,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4508 states. [2021-05-02 19:07:43,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4508 to 3772. [2021-05-02 19:07:43,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3772 states, 3768 states have (on average 1.0782908704883227) internal successors, (4063), 3768 states have internal predecessors, (4063), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:43,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3772 states to 3772 states and 4066 transitions. [2021-05-02 19:07:43,086 INFO L78 Accepts]: Start accepts. Automaton has 3772 states and 4066 transitions. Word has length 3027 [2021-05-02 19:07:43,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:43,087 INFO L480 AbstractCegarLoop]: Abstraction has 3772 states and 4066 transitions. [2021-05-02 19:07:43,087 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 7.666666666666667) internal successors, (69), 8 states have internal predecessors, (69), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:43,087 INFO L276 IsEmpty]: Start isEmpty. Operand 3772 states and 4066 transitions. [2021-05-02 19:07:43,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3772 [2021-05-02 19:07:43,171 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:43,172 INFO L523 BasicCegarLoop]: trace histogram [1440, 1440, 240, 240, 240, 40, 40, 40, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:43,393 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable19 [2021-05-02 19:07:43,393 INFO L428 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:43,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:43,394 INFO L82 PathProgramCache]: Analyzing trace with hash -646895482, now seen corresponding path program 14 times [2021-05-02 19:07:43,394 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:43,394 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792169183] [2021-05-02 19:07:43,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:43,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:45,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:45,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:45,332 INFO L134 CoverageAnalysis]: Checked inductivity of 2516207 backedges. 550820 proven. 31475 refuted. 0 times theorem prover too weak. 1933912 trivial. 0 not checked. [2021-05-02 19:07:45,332 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:45,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792169183] [2021-05-02 19:07:45,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792169183] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:45,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1929645726] [2021-05-02 19:07:45,333 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 19:07:46,273 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 19:07:46,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:46,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 6172 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 19:07:46,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:46,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:46,408 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:46,494 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:46,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:46,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:46,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:46,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:46,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:46,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:46,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:49,067 INFO L134 CoverageAnalysis]: Checked inductivity of 2516207 backedges. 550820 proven. 31475 refuted. 0 times theorem prover too weak. 1933912 trivial. 0 not checked. [2021-05-02 19:07:49,068 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1929645726] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:49,068 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:49,068 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 19:07:49,068 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289691762] [2021-05-02 19:07:49,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 19:07:49,070 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:49,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 19:07:49,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:07:49,071 INFO L87 Difference]: Start difference. First operand 3772 states and 4066 transitions. Second operand has 10 states, 10 states have (on average 7.7) internal successors, (77), 9 states have internal predecessors, (77), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:49,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:49,255 INFO L93 Difference]: Finished difference Result 4516 states and 4866 transitions. [2021-05-02 19:07:49,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 19:07:49,255 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 7.7) internal successors, (77), 9 states have internal predecessors, (77), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 3771 [2021-05-02 19:07:49,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:49,264 INFO L225 Difference]: With dead ends: 4516 [2021-05-02 19:07:49,264 INFO L226 Difference]: Without dead ends: 4516 [2021-05-02 19:07:49,265 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 3786 GetRequests, 3772 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 145.2ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 19:07:49,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4516 states. [2021-05-02 19:07:49,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4516 to 4516. [2021-05-02 19:07:49,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4516 states, 4512 states have (on average 1.0777925531914894) internal successors, (4863), 4512 states have internal predecessors, (4863), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:49,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4516 states to 4516 states and 4866 transitions. [2021-05-02 19:07:49,308 INFO L78 Accepts]: Start accepts. Automaton has 4516 states and 4866 transitions. Word has length 3771 [2021-05-02 19:07:49,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:49,308 INFO L480 AbstractCegarLoop]: Abstraction has 4516 states and 4866 transitions. [2021-05-02 19:07:49,308 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 7.7) internal successors, (77), 9 states have internal predecessors, (77), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:49,308 INFO L276 IsEmpty]: Start isEmpty. Operand 4516 states and 4866 transitions. [2021-05-02 19:07:49,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4516 [2021-05-02 19:07:49,423 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:49,424 INFO L523 BasicCegarLoop]: trace histogram [1728, 1728, 288, 288, 288, 48, 48, 48, 8, 8, 8, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:49,639 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:07:49,640 INFO L428 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:49,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:49,641 INFO L82 PathProgramCache]: Analyzing trace with hash 1173289862, now seen corresponding path program 15 times [2021-05-02 19:07:49,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:49,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113354155] [2021-05-02 19:07:49,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:07:50,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:52,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:07:52,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:07:52,342 INFO L134 CoverageAnalysis]: Checked inductivity of 3623643 backedges. 1359706 proven. 113309 refuted. 0 times theorem prover too weak. 2150628 trivial. 0 not checked. [2021-05-02 19:07:52,342 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:07:52,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113354155] [2021-05-02 19:07:52,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113354155] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:52,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492290489] [2021-05-02 19:07:52,342 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 19:07:54,456 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 378 check-sat command(s) [2021-05-02 19:07:54,456 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:07:54,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 2395 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 19:07:54,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:07:57,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:57,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:58,504 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:58,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:07:58,601 INFO L134 CoverageAnalysis]: Checked inductivity of 3623643 backedges. 1359710 proven. 113309 refuted. 0 times theorem prover too weak. 2150624 trivial. 0 not checked. [2021-05-02 19:07:58,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1492290489] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:07:58,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:07:58,602 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 19:07:58,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181911370] [2021-05-02 19:07:58,604 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 19:07:58,604 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:07:58,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 19:07:58,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 19:07:58,605 INFO L87 Difference]: Start difference. First operand 4516 states and 4866 transitions. Second operand has 7 states, 7 states have (on average 11.0) internal successors, (77), 6 states have internal predecessors, (77), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:58,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:07:58,758 INFO L93 Difference]: Finished difference Result 9000 states and 9694 transitions. [2021-05-02 19:07:58,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 19:07:58,758 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 11.0) internal successors, (77), 6 states have internal predecessors, (77), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 4515 [2021-05-02 19:07:58,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:07:58,777 INFO L225 Difference]: With dead ends: 9000 [2021-05-02 19:07:58,777 INFO L226 Difference]: Without dead ends: 9000 [2021-05-02 19:07:58,777 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4524 GetRequests, 4516 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 87.4ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 19:07:58,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9000 states. [2021-05-02 19:07:58,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9000 to 6760. [2021-05-02 19:07:58,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6760 states, 6756 states have (on average 1.0774126702190645) internal successors, (7279), 6756 states have internal predecessors, (7279), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:58,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6760 states to 6760 states and 7282 transitions. [2021-05-02 19:07:58,849 INFO L78 Accepts]: Start accepts. Automaton has 6760 states and 7282 transitions. Word has length 4515 [2021-05-02 19:07:58,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:07:58,851 INFO L480 AbstractCegarLoop]: Abstraction has 6760 states and 7282 transitions. [2021-05-02 19:07:58,851 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 11.0) internal successors, (77), 6 states have internal predecessors, (77), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:07:58,851 INFO L276 IsEmpty]: Start isEmpty. Operand 6760 states and 7282 transitions. [2021-05-02 19:07:59,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6760 [2021-05-02 19:07:59,130 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:07:59,132 INFO L523 BasicCegarLoop]: trace histogram [2592, 2592, 432, 432, 432, 72, 72, 72, 12, 12, 12, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:07:59,344 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 19:07:59,345 INFO L428 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:07:59,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:07:59,346 INFO L82 PathProgramCache]: Analyzing trace with hash 817295878, now seen corresponding path program 16 times [2021-05-02 19:07:59,346 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:07:59,346 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626032328] [2021-05-02 19:07:59,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:08:00,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:08:06,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:08:06,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:08:06,325 INFO L134 CoverageAnalysis]: Checked inductivity of 8154817 backedges. 3059317 proven. 339924 refuted. 0 times theorem prover too weak. 4755576 trivial. 0 not checked. [2021-05-02 19:08:06,325 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:08:06,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626032328] [2021-05-02 19:08:06,325 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626032328] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:08:06,325 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755235709] [2021-05-02 19:08:06,326 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 19:08:08,208 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 19:08:08,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:08:08,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 10967 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 19:08:08,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:08:08,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:08,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:09,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:09,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:09,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:09,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:13,284 INFO L134 CoverageAnalysis]: Checked inductivity of 8154817 backedges. 3059317 proven. 339924 refuted. 0 times theorem prover too weak. 4755576 trivial. 0 not checked. [2021-05-02 19:08:13,284 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1755235709] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:08:13,284 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:08:13,285 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 19:08:13,285 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153375172] [2021-05-02 19:08:13,288 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 19:08:13,288 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:08:13,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 19:08:13,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 19:08:13,289 INFO L87 Difference]: Start difference. First operand 6760 states and 7282 transitions. Second operand has 8 states, 8 states have (on average 9.0) internal successors, (72), 7 states have internal predecessors, (72), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:08:13,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:08:13,450 INFO L93 Difference]: Finished difference Result 11244 states and 12110 transitions. [2021-05-02 19:08:13,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 19:08:13,450 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 9.0) internal successors, (72), 7 states have internal predecessors, (72), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 6759 [2021-05-02 19:08:13,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:08:13,472 INFO L225 Difference]: With dead ends: 11244 [2021-05-02 19:08:13,472 INFO L226 Difference]: Without dead ends: 11244 [2021-05-02 19:08:13,472 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6770 GetRequests, 6760 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 90.3ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 19:08:13,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11244 states. [2021-05-02 19:08:13,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11244 to 9004. [2021-05-02 19:08:13,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9004 states, 9000 states have (on average 1.0772222222222223) internal successors, (9695), 9000 states have internal predecessors, (9695), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:08:13,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9004 states to 9004 states and 9698 transitions. [2021-05-02 19:08:13,569 INFO L78 Accepts]: Start accepts. Automaton has 9004 states and 9698 transitions. Word has length 6759 [2021-05-02 19:08:13,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:08:13,570 INFO L480 AbstractCegarLoop]: Abstraction has 9004 states and 9698 transitions. [2021-05-02 19:08:13,571 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 9.0) internal successors, (72), 7 states have internal predecessors, (72), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:08:13,571 INFO L276 IsEmpty]: Start isEmpty. Operand 9004 states and 9698 transitions. [2021-05-02 19:08:14,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9004 [2021-05-02 19:08:14,106 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:08:14,108 INFO L523 BasicCegarLoop]: trace histogram [3456, 3456, 576, 576, 576, 96, 96, 96, 16, 16, 16, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:08:14,332 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 19:08:14,333 INFO L428 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:08:14,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:08:14,334 INFO L82 PathProgramCache]: Analyzing trace with hash 522994310, now seen corresponding path program 17 times [2021-05-02 19:08:14,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:08:14,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613776279] [2021-05-02 19:08:14,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:08:17,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:08:25,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:08:25,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:08:26,084 INFO L134 CoverageAnalysis]: Checked inductivity of 14498903 backedges. 5438770 proven. 679846 refuted. 0 times theorem prover too weak. 8380287 trivial. 0 not checked. [2021-05-02 19:08:26,085 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:08:26,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613776279] [2021-05-02 19:08:26,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613776279] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:08:26,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506806899] [2021-05-02 19:08:26,085 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 19:08:32,386 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 722 check-sat command(s) [2021-05-02 19:08:32,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:08:32,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 6497 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 19:08:32,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 19:08:35,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:35,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:35,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:35,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:36,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:36,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:36,671 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:36,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 19:08:40,204 INFO L134 CoverageAnalysis]: Checked inductivity of 14498903 backedges. 9064618 proven. 679846 refuted. 0 times theorem prover too weak. 4754439 trivial. 0 not checked. [2021-05-02 19:08:40,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506806899] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:08:40,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 19:08:40,205 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 19:08:40,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471518732] [2021-05-02 19:08:40,209 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 19:08:40,209 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 19:08:40,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 19:08:40,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 19:08:40,209 INFO L87 Difference]: Start difference. First operand 9004 states and 9698 transitions. Second operand has 9 states, 9 states have (on average 10.777777777777779) internal successors, (97), 8 states have internal predecessors, (97), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:08:40,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 19:08:40,380 INFO L93 Difference]: Finished difference Result 13488 states and 14526 transitions. [2021-05-02 19:08:40,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 19:08:40,380 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 10.777777777777779) internal successors, (97), 8 states have internal predecessors, (97), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9003 [2021-05-02 19:08:40,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 19:08:40,395 INFO L225 Difference]: With dead ends: 13488 [2021-05-02 19:08:40,395 INFO L226 Difference]: Without dead ends: 13488 [2021-05-02 19:08:40,395 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9016 GetRequests, 9004 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 117.7ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 19:08:40,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13488 states. [2021-05-02 19:08:40,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13488 to 11248. [2021-05-02 19:08:40,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11248 states, 11244 states have (on average 1.0771077908217717) internal successors, (12111), 11244 states have internal predecessors, (12111), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:08:40,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11248 states to 11248 states and 12114 transitions. [2021-05-02 19:08:40,485 INFO L78 Accepts]: Start accepts. Automaton has 11248 states and 12114 transitions. Word has length 9003 [2021-05-02 19:08:40,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 19:08:40,487 INFO L480 AbstractCegarLoop]: Abstraction has 11248 states and 12114 transitions. [2021-05-02 19:08:40,487 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 10.777777777777779) internal successors, (97), 8 states have internal predecessors, (97), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 19:08:40,487 INFO L276 IsEmpty]: Start isEmpty. Operand 11248 states and 12114 transitions. [2021-05-02 19:08:41,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11248 [2021-05-02 19:08:41,291 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 19:08:41,293 INFO L523 BasicCegarLoop]: trace histogram [4320, 4320, 720, 720, 720, 120, 120, 120, 20, 20, 20, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 19:08:41,505 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 19:08:41,505 INFO L428 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 19:08:41,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 19:08:41,507 INFO L82 PathProgramCache]: Analyzing trace with hash 351202566, now seen corresponding path program 18 times [2021-05-02 19:08:41,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 19:08:41,507 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225721038] [2021-05-02 19:08:41,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 19:08:47,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:08:59,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 19:08:59,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 19:09:00,058 INFO L134 CoverageAnalysis]: Checked inductivity of 22655901 backedges. 8498065 proven. 1133075 refuted. 0 times theorem prover too weak. 13024761 trivial. 0 not checked. [2021-05-02 19:09:00,058 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 19:09:00,058 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225721038] [2021-05-02 19:09:00,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1225721038] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 19:09:00,058 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354567625] [2021-05-02 19:09:00,059 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 19:09:47,646 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 1505 check-sat command(s) [2021-05-02 19:09:47,646 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 19:09:47,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 11464 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 19:09:47,797 INFO L286 TraceCheckSpWp]: Computing forward predicates...