/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-acceleration/diamond_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:52:03,748 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:52:03,750 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:52:03,784 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 17:52:03,785 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 17:52:03,787 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 17:52:03,789 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 17:52:03,793 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 17:52:03,795 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 17:52:03,799 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 17:52:03,801 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 17:52:03,802 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2021-05-02 17:52:03,828 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:52:03,829 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:52:03,829 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:52:03,830 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-02 17:52:03,844 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:52:03,844 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:52:03,847 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:52:03,847 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:52:03,847 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:52:03,847 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:52:03,847 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:52:03,847 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:52:03,847 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:52:03,847 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:52:03,848 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:52:03,848 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:52:03,848 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:52:03,848 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:52:03,848 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:52:03,849 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:52:03,849 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 17:52:03,849 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:52:03,849 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:52:03,849 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:52:03,849 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:52:03,850 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-02 17:52:03,850 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:52:04,095 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:52:04,109 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:52:04,111 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:52:04,111 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:52:04,112 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:52:04,112 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_1-2.c [2021-05-02 17:52:04,169 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/340d4c31b/6e7dc47019e3444f8a38686f3486cb0b/FLAG44e6979aa [2021-05-02 17:52:04,529 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:52:04,529 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_1-2.c [2021-05-02 17:52:04,533 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/340d4c31b/6e7dc47019e3444f8a38686f3486cb0b/FLAG44e6979aa [2021-05-02 17:52:04,545 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/340d4c31b/6e7dc47019e3444f8a38686f3486cb0b [2021-05-02 17:52:04,547 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:52:04,548 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-02 17:52:04,549 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:52:04,549 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:52:04,552 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:52:04,552 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:52:04" (1/1) ... [2021-05-02 17:52:04,553 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c6a8f76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:04, skipping insertion in model container [2021-05-02 17:52:04,553 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:52:04" (1/1) ... [2021-05-02 17:52:04,557 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:52:04,565 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:52:04,640 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-acceleration/diamond_1-2.c[373,386] [2021-05-02 17:52:04,648 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:52:04,653 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:52:04,660 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-acceleration/diamond_1-2.c[373,386] [2021-05-02 17:52:04,663 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:52:04,671 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:52:04,672 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:04 WrapperNode [2021-05-02 17:52:04,672 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:52:04,672 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:52:04,673 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:52:04,673 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:52:04,689 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:04" (1/1) ... [2021-05-02 17:52:04,689 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:04" (1/1) ... [2021-05-02 17:52:04,693 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:04" (1/1) ... [2021-05-02 17:52:04,693 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:04" (1/1) ... [2021-05-02 17:52:04,696 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:04" (1/1) ... [2021-05-02 17:52:04,698 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:04" (1/1) ... [2021-05-02 17:52:04,699 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:04" (1/1) ... [2021-05-02 17:52:04,721 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:52:04,722 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:52:04,722 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:52:04,722 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:52:04,723 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:04" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:52:04,782 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:52:04,782 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:52:04,782 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:52:04,783 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:52:04,783 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:52:04,783 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:52:04,783 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:52:04,783 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:52:04,783 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:52:04,783 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 17:52:04,784 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:52:04,784 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:52:04,784 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:52:04,784 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:52:04,784 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:52:04,784 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:52:04,784 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:52:04,784 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:52:04,978 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:52:04,978 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:52:04,979 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:52:04 BoogieIcfgContainer [2021-05-02 17:52:04,979 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:52:04,979 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-02 17:52:04,979 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-02 17:52:04,980 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-02 17:52:04,982 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:52:04" (1/1) ... [2021-05-02 17:52:05,009 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:52:05 BasicIcfg [2021-05-02 17:52:05,009 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-02 17:52:05,010 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:52:05,010 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:52:05,012 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:52:05,012 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:52:04" (1/4) ... [2021-05-02 17:52:05,012 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@138994bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:52:05, skipping insertion in model container [2021-05-02 17:52:05,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:52:04" (2/4) ... [2021-05-02 17:52:05,013 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@138994bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:52:05, skipping insertion in model container [2021-05-02 17:52:05,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:52:04" (3/4) ... [2021-05-02 17:52:05,013 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@138994bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:52:05, skipping insertion in model container [2021-05-02 17:52:05,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 02.05 05:52:05" (4/4) ... [2021-05-02 17:52:05,014 INFO L111 eAbstractionObserver]: Analyzing ICFG diamond_1-2.cJordan [2021-05-02 17:52:05,034 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:52:05,037 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:52:05,047 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:52:05,059 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:52:05,059 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-02 17:52:05,059 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-02 17:52:05,059 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:52:05,059 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:52:05,059 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:52:05,059 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:52:05,059 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:52:05,069 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 17:52:05,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 17:52:05,073 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:05,073 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:05,074 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:05,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:05,077 INFO L82 PathProgramCache]: Analyzing trace with hash -756157467, now seen corresponding path program 1 times [2021-05-02 17:52:05,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:05,083 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869960943] [2021-05-02 17:52:05,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:05,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:05,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:05,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:05,213 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:05,214 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:05,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869960943] [2021-05-02 17:52:05,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869960943] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:52:05,214 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:52:05,214 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:52:05,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383932460] [2021-05-02 17:52:05,217 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:52:05,218 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:05,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:52:05,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:52:05,227 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:05,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:05,267 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2021-05-02 17:52:05,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:52:05,269 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 17:52:05,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:05,274 INFO L225 Difference]: With dead ends: 19 [2021-05-02 17:52:05,274 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 17:52:05,275 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 23.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:52:05,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 17:52:05,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-02 17:52:05,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:05,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-02 17:52:05,294 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-05-02 17:52:05,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:05,294 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-02 17:52:05,294 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:05,295 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-02 17:52:05,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 17:52:05,295 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:05,295 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:05,295 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:52:05,296 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:05,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:05,297 INFO L82 PathProgramCache]: Analyzing trace with hash -755233946, now seen corresponding path program 1 times [2021-05-02 17:52:05,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:05,298 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278899360] [2021-05-02 17:52:05,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:05,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:05,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:05,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:05,438 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:05,439 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:05,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278899360] [2021-05-02 17:52:05,440 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278899360] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:52:05,440 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:52:05,440 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:52:05,440 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870595846] [2021-05-02 17:52:05,441 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:52:05,441 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:05,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:52:05,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:52:05,442 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:05,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:05,491 INFO L93 Difference]: Finished difference Result 15 states and 17 transitions. [2021-05-02 17:52:05,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:52:05,492 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 17:52:05,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:05,493 INFO L225 Difference]: With dead ends: 15 [2021-05-02 17:52:05,494 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 17:52:05,494 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.7ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:52:05,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 17:52:05,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-05-02 17:52:05,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:05,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 17:52:05,500 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 17:52:05,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:05,500 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 17:52:05,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:05,500 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 17:52:05,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 17:52:05,501 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:05,501 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:05,501 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:52:05,501 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:05,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:05,502 INFO L82 PathProgramCache]: Analyzing trace with hash 980092676, now seen corresponding path program 1 times [2021-05-02 17:52:05,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:05,503 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023813388] [2021-05-02 17:52:05,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:05,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:05,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:05,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:05,614 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:05,618 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:05,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023813388] [2021-05-02 17:52:05,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2023813388] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:05,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096726043] [2021-05-02 17:52:05,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:05,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:05,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:52:05,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:05,752 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:05,753 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096726043] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:05,753 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:05,753 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 17:52:05,753 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220118851] [2021-05-02 17:52:05,754 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:52:05,754 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:05,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:52:05,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:52:05,756 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:05,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:05,830 INFO L93 Difference]: Finished difference Result 17 states and 20 transitions. [2021-05-02 17:52:05,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 17:52:05,830 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-02 17:52:05,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:05,832 INFO L225 Difference]: With dead ends: 17 [2021-05-02 17:52:05,832 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 17:52:05,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 80.8ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:52:05,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 17:52:05,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 17:52:05,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:05,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-05-02 17:52:05,836 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 13 [2021-05-02 17:52:05,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:05,836 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-05-02 17:52:05,836 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:05,836 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-05-02 17:52:05,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 17:52:05,836 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:05,837 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:06,052 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 17:52:06,053 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:06,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:06,053 INFO L82 PathProgramCache]: Analyzing trace with hash 1008721827, now seen corresponding path program 1 times [2021-05-02 17:52:06,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:06,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170378917] [2021-05-02 17:52:06,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:06,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:06,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:06,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:06,106 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:06,107 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:06,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170378917] [2021-05-02 17:52:06,107 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170378917] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:06,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [776657461] [2021-05-02 17:52:06,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:06,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:06,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 17:52:06,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:06,200 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:06,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [776657461] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:06,200 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:06,200 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 17:52:06,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105528204] [2021-05-02 17:52:06,201 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:52:06,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:06,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:52:06,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:52:06,203 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:06,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:06,324 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2021-05-02 17:52:06,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:52:06,324 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-02 17:52:06,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:06,325 INFO L225 Difference]: With dead ends: 19 [2021-05-02 17:52:06,325 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 17:52:06,325 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 101.8ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:52:06,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 17:52:06,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 16. [2021-05-02 17:52:06,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:06,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-05-02 17:52:06,329 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 13 [2021-05-02 17:52:06,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:06,329 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-05-02 17:52:06,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:06,329 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-05-02 17:52:06,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 17:52:06,330 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:06,330 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:06,545 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:06,546 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:06,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:06,546 INFO L82 PathProgramCache]: Analyzing trace with hash -2113301726, now seen corresponding path program 2 times [2021-05-02 17:52:06,546 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:06,547 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602334398] [2021-05-02 17:52:06,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:06,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:06,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:06,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:06,636 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:06,636 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:06,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602334398] [2021-05-02 17:52:06,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602334398] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:06,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1695649778] [2021-05-02 17:52:06,636 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 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:06,671 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:52:06,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:06,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 17:52:06,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:06,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:06,717 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:06,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1695649778] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:06,717 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:06,717 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 17:52:06,718 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132313457] [2021-05-02 17:52:06,718 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:52:06,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:06,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:52:06,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:52:06,718 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:06,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:06,816 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2021-05-02 17:52:06,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:52:06,816 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 17:52:06,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:06,817 INFO L225 Difference]: With dead ends: 20 [2021-05-02 17:52:06,817 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 17:52:06,817 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 98.0ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:52:06,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 17:52:06,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2021-05-02 17:52:06,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:06,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2021-05-02 17:52:06,819 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 15 [2021-05-02 17:52:06,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:06,819 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2021-05-02 17:52:06,819 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:06,819 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2021-05-02 17:52:06,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 17:52:06,819 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:06,820 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:07,035 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:07,036 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:07,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:07,036 INFO L82 PathProgramCache]: Analyzing trace with hash -2084672575, now seen corresponding path program 1 times [2021-05-02 17:52:07,036 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:07,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496239698] [2021-05-02 17:52:07,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:07,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:07,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,072 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 17:52:07,072 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:07,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496239698] [2021-05-02 17:52:07,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1496239698] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:52:07,072 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:52:07,072 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:52:07,072 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654881613] [2021-05-02 17:52:07,073 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:52:07,073 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:07,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:52:07,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:52:07,073 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:07,107 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2021-05-02 17:52:07,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:52:07,107 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 17:52:07,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:07,108 INFO L225 Difference]: With dead ends: 22 [2021-05-02 17:52:07,108 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 17:52:07,109 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 35.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:52:07,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 17:52:07,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-02 17:52:07,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-05-02 17:52:07,111 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 15 [2021-05-02 17:52:07,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:07,111 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-05-02 17:52:07,111 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,111 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-05-02 17:52:07,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 17:52:07,112 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:07,112 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:07,112 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 17:52:07,112 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:07,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:07,112 INFO L82 PathProgramCache]: Analyzing trace with hash -370491391, now seen corresponding path program 2 times [2021-05-02 17:52:07,112 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:07,112 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1408380406] [2021-05-02 17:52:07,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:07,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:07,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,143 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 17:52:07,144 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:07,144 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1408380406] [2021-05-02 17:52:07,144 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1408380406] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:52:07,144 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:52:07,144 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 17:52:07,144 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642548179] [2021-05-02 17:52:07,144 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 17:52:07,144 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:07,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 17:52:07,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 17:52:07,145 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:07,179 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-05-02 17:52:07,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 17:52:07,179 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 17:52:07,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:07,180 INFO L225 Difference]: With dead ends: 22 [2021-05-02 17:52:07,180 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 17:52:07,180 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 35.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 17:52:07,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 17:52:07,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-05-02 17:52:07,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-05-02 17:52:07,182 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 15 [2021-05-02 17:52:07,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:07,182 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-05-02 17:52:07,182 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,182 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-05-02 17:52:07,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 17:52:07,182 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:07,183 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:07,183 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-02 17:52:07,183 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:07,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:07,183 INFO L82 PathProgramCache]: Analyzing trace with hash -341862240, now seen corresponding path program 2 times [2021-05-02 17:52:07,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:07,183 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810035385] [2021-05-02 17:52:07,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:07,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:07,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,238 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:07,238 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:07,239 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1810035385] [2021-05-02 17:52:07,239 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1810035385] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:07,239 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943580180] [2021-05-02 17:52:07,239 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:07,280 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:52:07,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:07,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 17:52:07,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:07,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:07,318 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:07,318 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1943580180] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:07,318 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:07,318 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 17:52:07,318 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876173141] [2021-05-02 17:52:07,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:52:07,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:07,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:52:07,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:52:07,319 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:07,422 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2021-05-02 17:52:07,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:52:07,423 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 17:52:07,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:07,423 INFO L225 Difference]: With dead ends: 24 [2021-05-02 17:52:07,423 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 17:52:07,424 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 113.0ms TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:52:07,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 17:52:07,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-05-02 17:52:07,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-05-02 17:52:07,425 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 15 [2021-05-02 17:52:07,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:07,425 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-05-02 17:52:07,426 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,426 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-05-02 17:52:07,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:52:07,426 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:07,426 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:07,641 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:07,642 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:07,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:07,642 INFO L82 PathProgramCache]: Analyzing trace with hash 1547014080, now seen corresponding path program 3 times [2021-05-02 17:52:07,642 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:07,642 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [122892846] [2021-05-02 17:52:07,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:07,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:07,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:07,701 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:07,701 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:07,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [122892846] [2021-05-02 17:52:07,701 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [122892846] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:07,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788417077] [2021-05-02 17:52:07,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:07,784 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 17:52:07,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:07,785 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 17:52:07,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:07,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:07,827 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:07,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [788417077] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:07,827 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:07,827 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 17:52:07,827 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924747207] [2021-05-02 17:52:07,827 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:52:07,827 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:07,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:52:07,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:52:07,828 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:07,939 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-05-02 17:52:07,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:52:07,939 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 17:52:07,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:07,940 INFO L225 Difference]: With dead ends: 26 [2021-05-02 17:52:07,940 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 17:52:07,940 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 117.1ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:52:07,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 17:52:07,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-02 17:52:07,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-02 17:52:07,942 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2021-05-02 17:52:07,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:07,942 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-02 17:52:07,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:07,942 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-02 17:52:07,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:52:07,943 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:07,943 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:08,158 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:08,159 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:08,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:08,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1173027235, now seen corresponding path program 3 times [2021-05-02 17:52:08,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:08,159 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192788768] [2021-05-02 17:52:08,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:08,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:08,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:08,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:08,217 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:08,217 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:08,218 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192788768] [2021-05-02 17:52:08,218 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [192788768] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:08,218 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [942664451] [2021-05-02 17:52:08,233 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:08,299 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 17:52:08,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:08,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 17:52:08,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:08,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:08,338 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:08,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [942664451] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:08,338 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:08,338 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 17:52:08,338 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940206437] [2021-05-02 17:52:08,338 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:52:08,338 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:08,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:52:08,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:52:08,339 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:08,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:08,471 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-05-02 17:52:08,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:52:08,472 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 17:52:08,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:08,472 INFO L225 Difference]: With dead ends: 28 [2021-05-02 17:52:08,472 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 17:52:08,473 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 134.2ms TimeCoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:52:08,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 17:52:08,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-02 17:52:08,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:08,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2021-05-02 17:52:08,476 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 17 [2021-05-02 17:52:08,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:08,476 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2021-05-02 17:52:08,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:08,476 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2021-05-02 17:52:08,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 17:52:08,477 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:08,477 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:08,685 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:08,686 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:08,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:08,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1532288222, now seen corresponding path program 4 times [2021-05-02 17:52:08,700 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:08,700 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56827022] [2021-05-02 17:52:08,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:08,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:08,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:08,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:08,797 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:08,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:08,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56827022] [2021-05-02 17:52:08,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56827022] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:08,798 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1633354753] [2021-05-02 17:52:08,798 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-05-02 17:52:08,871 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:52:08,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:08,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 17 conjunts are in the unsatisfiable core Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:08,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:08,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:08,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:08,965 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:09,001 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:09,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1633354753] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:09,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:09,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 14 [2021-05-02 17:52:09,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984821767] [2021-05-02 17:52:09,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 17:52:09,002 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:09,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 17:52:09,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:52:09,002 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 12 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:09,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:09,217 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-05-02 17:52:09,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:52:09,218 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 12 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 17:52:09,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:09,218 INFO L225 Difference]: With dead ends: 30 [2021-05-02 17:52:09,218 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 17:52:09,219 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 218.0ms TimeCoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2021-05-02 17:52:09,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 17:52:09,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-05-02 17:52:09,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:09,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-05-02 17:52:09,220 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 19 [2021-05-02 17:52:09,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:09,221 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-05-02 17:52:09,221 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 12 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:09,221 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-05-02 17:52:09,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 17:52:09,221 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:09,221 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:09,438 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:09,439 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:09,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:09,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1058670374, now seen corresponding path program 4 times [2021-05-02 17:52:09,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:09,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594651129] [2021-05-02 17:52:09,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:09,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:09,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:09,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:09,506 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:09,506 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:09,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594651129] [2021-05-02 17:52:09,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594651129] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:09,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913178605] [2021-05-02 17:52:09,506 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:09,544 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:52:09,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:09,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 17:52:09,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:09,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:09,585 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:09,585 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [913178605] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:09,585 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:09,585 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 17:52:09,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061060954] [2021-05-02 17:52:09,586 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:52:09,586 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:09,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:52:09,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:52:09,586 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:09,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:09,746 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-05-02 17:52:09,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:52:09,746 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 17:52:09,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:09,747 INFO L225 Difference]: With dead ends: 32 [2021-05-02 17:52:09,747 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 17:52:09,747 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 158.4ms TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:52:09,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 17:52:09,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2021-05-02 17:52:09,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:09,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2021-05-02 17:52:09,750 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 19 [2021-05-02 17:52:09,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:09,750 INFO L480 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2021-05-02 17:52:09,750 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 8 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:09,750 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2021-05-02 17:52:09,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 17:52:09,750 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:09,750 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:09,966 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 17:52:09,966 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:09,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:09,966 INFO L82 PathProgramCache]: Analyzing trace with hash 265640572, now seen corresponding path program 5 times [2021-05-02 17:52:09,966 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:09,967 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983172207] [2021-05-02 17:52:09,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:09,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:10,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:10,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:10,040 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:10,040 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:10,040 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983172207] [2021-05-02 17:52:10,040 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [983172207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:10,040 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1437133279] [2021-05-02 17:52:10,040 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:10,084 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 17:52:10,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:10,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 17:52:10,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:10,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:10,130 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:10,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1437133279] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:10,131 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:10,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 17:52:10,131 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576058950] [2021-05-02 17:52:10,131 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:52:10,131 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:10,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:52:10,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:52:10,132 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:10,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:10,300 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-05-02 17:52:10,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:52:10,301 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 17:52:10,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:10,301 INFO L225 Difference]: With dead ends: 34 [2021-05-02 17:52:10,301 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 17:52:10,302 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 167.8ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:52:10,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 17:52:10,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 17:52:10,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:10,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-05-02 17:52:10,303 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 21 [2021-05-02 17:52:10,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:10,304 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-05-02 17:52:10,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:10,304 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-05-02 17:52:10,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 17:52:10,304 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:10,304 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:10,519 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:10,520 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:10,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:10,520 INFO L82 PathProgramCache]: Analyzing trace with hash 1464090647, now seen corresponding path program 5 times [2021-05-02 17:52:10,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:10,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918497528] [2021-05-02 17:52:10,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:10,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:10,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:10,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:10,593 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:10,593 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:10,594 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918497528] [2021-05-02 17:52:10,594 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [918497528] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:10,594 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [120191005] [2021-05-02 17:52:10,594 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:10,655 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 17:52:10,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:10,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 17:52:10,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:10,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:10,709 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:10,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [120191005] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:10,709 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:10,709 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 17:52:10,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259478184] [2021-05-02 17:52:10,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:52:10,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:10,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:52:10,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:52:10,710 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:10,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:10,889 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-05-02 17:52:10,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:52:10,889 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 17:52:10,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:10,889 INFO L225 Difference]: With dead ends: 36 [2021-05-02 17:52:10,890 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 17:52:10,890 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 190.0ms TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-05-02 17:52:10,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 17:52:10,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2021-05-02 17:52:10,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:10,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2021-05-02 17:52:10,892 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 21 [2021-05-02 17:52:10,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:10,892 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2021-05-02 17:52:10,892 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:10,892 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2021-05-02 17:52:10,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 17:52:10,892 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:10,892 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:11,108 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 17:52:11,108 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:11,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:11,109 INFO L82 PathProgramCache]: Analyzing trace with hash -1507006310, now seen corresponding path program 6 times [2021-05-02 17:52:11,109 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:11,109 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376572694] [2021-05-02 17:52:11,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:11,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:11,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:11,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:11,203 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:11,203 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:11,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376572694] [2021-05-02 17:52:11,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [376572694] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:11,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282553838] [2021-05-02 17:52:11,204 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:11,273 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 17:52:11,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:11,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 17:52:11,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:11,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:11,319 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:11,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282553838] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:11,319 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:11,319 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 17:52:11,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457171634] [2021-05-02 17:52:11,319 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:52:11,320 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:11,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:52:11,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:52:11,320 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:11,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:11,513 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2021-05-02 17:52:11,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:52:11,514 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 17:52:11,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:11,514 INFO L225 Difference]: With dead ends: 38 [2021-05-02 17:52:11,514 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 17:52:11,514 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 202.6ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 17:52:11,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 17:52:11,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-05-02 17:52:11,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:11,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-05-02 17:52:11,516 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 23 [2021-05-02 17:52:11,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:11,516 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-05-02 17:52:11,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:11,516 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-05-02 17:52:11,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 17:52:11,517 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:11,517 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:11,732 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 17:52:11,732 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:11,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:11,732 INFO L82 PathProgramCache]: Analyzing trace with hash -819090412, now seen corresponding path program 6 times [2021-05-02 17:52:11,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:11,733 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607396692] [2021-05-02 17:52:11,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:11,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:11,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:11,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:11,822 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:11,822 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:11,822 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607396692] [2021-05-02 17:52:11,822 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607396692] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:11,822 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356966782] [2021-05-02 17:52:11,822 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:11,947 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 17:52:11,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:11,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 17:52:11,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:11,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:11,993 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:11,993 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356966782] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:11,993 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:11,993 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 17:52:11,993 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642510284] [2021-05-02 17:52:11,993 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:52:11,993 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:11,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:52:11,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:52:11,994 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:12,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:12,218 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2021-05-02 17:52:12,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:52:12,219 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 17:52:12,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:12,219 INFO L225 Difference]: With dead ends: 40 [2021-05-02 17:52:12,219 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 17:52:12,219 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 225.9ms TimeCoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:52:12,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 17:52:12,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2021-05-02 17:52:12,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:12,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2021-05-02 17:52:12,222 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 23 [2021-05-02 17:52:12,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:12,222 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2021-05-02 17:52:12,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 10 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:12,222 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2021-05-02 17:52:12,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 17:52:12,222 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:12,222 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:12,424 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 17:52:12,424 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:12,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:12,427 INFO L82 PathProgramCache]: Analyzing trace with hash 81356600, now seen corresponding path program 7 times [2021-05-02 17:52:12,427 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:12,427 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [864868205] [2021-05-02 17:52:12,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:12,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:12,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:12,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:12,534 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:12,534 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:12,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [864868205] [2021-05-02 17:52:12,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [864868205] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:12,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [366504475] [2021-05-02 17:52:12,534 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:12,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:12,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 17:52:12,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:12,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:12,649 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:12,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [366504475] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:12,649 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:12,649 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 17:52:12,650 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289084046] [2021-05-02 17:52:12,650 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 17:52:12,650 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:12,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 17:52:12,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:52:12,650 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:12,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:12,906 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-05-02 17:52:12,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:52:12,906 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 17:52:12,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:12,907 INFO L225 Difference]: With dead ends: 42 [2021-05-02 17:52:12,907 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 17:52:12,907 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 220.0ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:52:12,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 17:52:12,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2021-05-02 17:52:12,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:12,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2021-05-02 17:52:12,909 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 25 [2021-05-02 17:52:12,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:12,909 INFO L480 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2021-05-02 17:52:12,909 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:12,909 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2021-05-02 17:52:12,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 17:52:12,910 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:12,910 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:13,124 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 17:52:13,125 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:13,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:13,125 INFO L82 PathProgramCache]: Analyzing trace with hash -227799855, now seen corresponding path program 7 times [2021-05-02 17:52:13,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:13,125 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886517704] [2021-05-02 17:52:13,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:13,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:13,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:13,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:13,216 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:13,216 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:13,216 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886517704] [2021-05-02 17:52:13,216 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [886517704] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:13,216 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031158799] [2021-05-02 17:52:13,216 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:13,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:13,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 17:52:13,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:13,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:13,311 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:13,311 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031158799] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:13,311 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:13,311 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 17:52:13,311 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213944321] [2021-05-02 17:52:13,311 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 17:52:13,311 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:13,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 17:52:13,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:52:13,312 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:13,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:13,562 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2021-05-02 17:52:13,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 17:52:13,563 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 17:52:13,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:13,563 INFO L225 Difference]: With dead ends: 44 [2021-05-02 17:52:13,563 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 17:52:13,563 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 245.4ms TimeCoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2021-05-02 17:52:13,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 17:52:13,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2021-05-02 17:52:13,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:13,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-05-02 17:52:13,565 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 25 [2021-05-02 17:52:13,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:13,566 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-05-02 17:52:13,566 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 11 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:13,566 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-05-02 17:52:13,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 17:52:13,566 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:13,566 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:13,782 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:13,782 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:13,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:13,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1784723030, now seen corresponding path program 8 times [2021-05-02 17:52:13,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:13,783 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608484954] [2021-05-02 17:52:13,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:13,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:13,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:13,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:13,887 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:13,887 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:13,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608484954] [2021-05-02 17:52:13,887 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608484954] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:13,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124854489] [2021-05-02 17:52:13,887 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:13,976 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:52:13,977 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:13,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:52:13,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:14,044 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:14,050 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:14,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124854489] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:14,050 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:14,050 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 17:52:14,050 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17174565] [2021-05-02 17:52:14,051 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:52:14,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:14,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:52:14,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:52:14,051 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:14,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:14,348 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2021-05-02 17:52:14,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 17:52:14,349 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 17:52:14,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:14,349 INFO L225 Difference]: With dead ends: 46 [2021-05-02 17:52:14,349 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 17:52:14,349 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 274.0ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 17:52:14,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 17:52:14,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2021-05-02 17:52:14,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:14,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-05-02 17:52:14,351 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 27 [2021-05-02 17:52:14,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:14,351 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-05-02 17:52:14,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:14,352 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-05-02 17:52:14,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 17:52:14,352 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:14,352 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:14,567 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:14,568 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:14,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:14,568 INFO L82 PathProgramCache]: Analyzing trace with hash 1066742350, now seen corresponding path program 8 times [2021-05-02 17:52:14,568 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:14,568 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655774466] [2021-05-02 17:52:14,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:14,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:14,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:14,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:14,669 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:14,669 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:14,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655774466] [2021-05-02 17:52:14,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655774466] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:14,670 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1688842526] [2021-05-02 17:52:14,670 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:14,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:52:14,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:14,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:52:14,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:14,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:14,758 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:14,758 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1688842526] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:14,758 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:14,758 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 17:52:14,758 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106126456] [2021-05-02 17:52:14,759 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:52:14,759 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:14,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:52:14,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:52:14,759 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:15,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:15,071 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-05-02 17:52:15,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 17:52:15,072 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 17:52:15,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:15,072 INFO L225 Difference]: With dead ends: 48 [2021-05-02 17:52:15,072 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 17:52:15,072 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 296.7ms TimeCoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-05-02 17:52:15,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 17:52:15,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2021-05-02 17:52:15,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 42 states have (on average 1.0714285714285714) internal successors, (45), 42 states have internal predecessors, (45), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:15,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2021-05-02 17:52:15,074 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 27 [2021-05-02 17:52:15,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:15,074 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2021-05-02 17:52:15,074 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 12 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:15,075 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2021-05-02 17:52:15,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 17:52:15,075 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:15,075 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:15,290 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:15,291 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:15,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:15,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1957644812, now seen corresponding path program 9 times [2021-05-02 17:52:15,291 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:15,291 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552794716] [2021-05-02 17:52:15,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:15,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:15,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:15,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:15,415 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:15,415 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:15,415 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552794716] [2021-05-02 17:52:15,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552794716] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:15,416 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598884908] [2021-05-02 17:52:15,416 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 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 17:52:15,559 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 17:52:15,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:15,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 17:52:15,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:15,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:15,640 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:15,640 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598884908] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:15,640 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:15,640 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 17:52:15,641 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584662045] [2021-05-02 17:52:15,642 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 17:52:15,642 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:15,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 17:52:15,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:52:15,643 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:15,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:15,955 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2021-05-02 17:52:15,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 17:52:15,955 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 17:52:15,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:15,956 INFO L225 Difference]: With dead ends: 50 [2021-05-02 17:52:15,956 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 17:52:15,956 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 314.5ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 17:52:15,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 17:52:15,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2021-05-02 17:52:15,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:15,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2021-05-02 17:52:15,958 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 29 [2021-05-02 17:52:15,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:15,958 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2021-05-02 17:52:15,958 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:15,958 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2021-05-02 17:52:15,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 17:52:15,959 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:15,959 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:16,162 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 17:52:16,162 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:16,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:16,165 INFO L82 PathProgramCache]: Analyzing trace with hash -418714485, now seen corresponding path program 9 times [2021-05-02 17:52:16,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:16,165 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1365398499] [2021-05-02 17:52:16,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:16,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:16,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:16,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:16,304 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:16,304 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:16,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1365398499] [2021-05-02 17:52:16,304 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1365398499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:16,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [552216002] [2021-05-02 17:52:16,305 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 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 17:52:16,395 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 17:52:16,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:16,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 17:52:16,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:16,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:16,454 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:16,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [552216002] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:16,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:16,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 17:52:16,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372587232] [2021-05-02 17:52:16,455 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 17:52:16,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:16,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 17:52:16,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:52:16,455 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:16,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:16,847 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2021-05-02 17:52:16,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 17:52:16,848 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 17:52:16,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:16,848 INFO L225 Difference]: With dead ends: 52 [2021-05-02 17:52:16,848 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 17:52:16,849 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 360.6ms TimeCoverageRelationStatistics Valid=99, Invalid=501, Unknown=0, NotChecked=0, Total=600 [2021-05-02 17:52:16,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 17:52:16,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-02 17:52:16,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:16,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-02 17:52:16,850 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 29 [2021-05-02 17:52:16,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:16,851 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-02 17:52:16,851 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 13 states have internal predecessors, (28), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:16,851 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-02 17:52:16,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 17:52:16,851 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:16,851 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:17,067 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 17:52:17,068 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:17,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:17,068 INFO L82 PathProgramCache]: Analyzing trace with hash 809453074, now seen corresponding path program 10 times [2021-05-02 17:52:17,068 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:17,068 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838138961] [2021-05-02 17:52:17,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:17,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:17,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:17,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:17,203 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:17,203 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:17,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838138961] [2021-05-02 17:52:17,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838138961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:17,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463509395] [2021-05-02 17:52:17,203 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:17,277 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:52:17,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:17,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 17:52:17,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:17,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:17,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:17,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:17,498 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:17,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463509395] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:17,498 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:17,498 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 26 [2021-05-02 17:52:17,498 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581264878] [2021-05-02 17:52:17,499 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 17:52:17,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:17,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 17:52:17,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=572, Unknown=0, NotChecked=0, Total=650 [2021-05-02 17:52:17,500 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 26 states, 26 states have (on average 1.9230769230769231) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:18,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:18,167 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2021-05-02 17:52:18,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 17:52:18,168 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.9230769230769231) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 17:52:18,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:18,168 INFO L225 Difference]: With dead ends: 54 [2021-05-02 17:52:18,168 INFO L226 Difference]: Without dead ends: 54 [2021-05-02 17:52:18,169 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333 ImplicationChecksByTransitivity, 652.8ms TimeCoverageRelationStatistics Valid=185, Invalid=1537, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 17:52:18,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-05-02 17:52:18,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2021-05-02 17:52:18,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:18,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2021-05-02 17:52:18,170 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 31 [2021-05-02 17:52:18,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:18,171 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2021-05-02 17:52:18,171 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.9230769230769231) internal successors, (50), 24 states have internal predecessors, (50), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:18,171 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2021-05-02 17:52:18,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 17:52:18,171 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:18,171 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:18,386 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 17:52:18,386 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:18,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:18,386 INFO L82 PathProgramCache]: Analyzing trace with hash -2013590648, now seen corresponding path program 10 times [2021-05-02 17:52:18,386 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:18,387 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1402074396] [2021-05-02 17:52:18,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:18,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:18,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:18,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:18,528 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:18,528 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:18,528 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1402074396] [2021-05-02 17:52:18,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1402074396] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:18,528 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1272408505] [2021-05-02 17:52:18,528 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:18,630 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:52:18,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:18,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 17:52:18,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:18,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:18,691 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:18,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1272408505] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:18,692 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:18,692 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2021-05-02 17:52:18,692 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628888141] [2021-05-02 17:52:18,692 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 17:52:18,693 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:18,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 17:52:18,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:52:18,693 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:19,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:19,107 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2021-05-02 17:52:19,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 17:52:19,107 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 17:52:19,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:19,107 INFO L225 Difference]: With dead ends: 56 [2021-05-02 17:52:19,107 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 17:52:19,108 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 400.3ms TimeCoverageRelationStatistics Valid=108, Invalid=594, Unknown=0, NotChecked=0, Total=702 [2021-05-02 17:52:19,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 17:52:19,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-02 17:52:19,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 50 states have (on average 1.06) internal successors, (53), 50 states have internal predecessors, (53), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:19,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-02 17:52:19,109 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 31 [2021-05-02 17:52:19,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:19,109 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-02 17:52:19,109 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 14 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:19,109 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-02 17:52:19,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 17:52:19,110 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:19,110 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:19,317 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 17:52:19,319 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:19,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:19,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1405765296, now seen corresponding path program 11 times [2021-05-02 17:52:19,319 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:19,319 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734296995] [2021-05-02 17:52:19,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:19,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:19,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:19,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:19,492 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:19,492 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:19,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734296995] [2021-05-02 17:52:19,492 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [734296995] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:19,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [224168069] [2021-05-02 17:52:19,492 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:19,633 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-02 17:52:19,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:19,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 17:52:19,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:19,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:19,767 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:19,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [224168069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:19,767 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:19,767 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 17:52:19,767 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421120049] [2021-05-02 17:52:19,767 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 17:52:19,767 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:19,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 17:52:19,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:52:19,768 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:20,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:20,200 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2021-05-02 17:52:20,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 17:52:20,201 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 17:52:20,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:20,201 INFO L225 Difference]: With dead ends: 58 [2021-05-02 17:52:20,201 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 17:52:20,202 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 24 SyntacticMatches, 11 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 469.6ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 17:52:20,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 17:52:20,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2021-05-02 17:52:20,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 52 states have (on average 1.0576923076923077) internal successors, (55), 52 states have internal predecessors, (55), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:20,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2021-05-02 17:52:20,206 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 33 [2021-05-02 17:52:20,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:20,207 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2021-05-02 17:52:20,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:20,207 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2021-05-02 17:52:20,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 17:52:20,207 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:20,207 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:20,410 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 17:52:20,410 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:20,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:20,410 INFO L82 PathProgramCache]: Analyzing trace with hash -1386258619, now seen corresponding path program 11 times [2021-05-02 17:52:20,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:20,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1566384322] [2021-05-02 17:52:20,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:20,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:20,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:20,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:20,573 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:20,573 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:20,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1566384322] [2021-05-02 17:52:20,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1566384322] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:20,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479736078] [2021-05-02 17:52:20,573 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:20,677 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-05-02 17:52:20,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:20,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 17:52:20,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:20,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:20,837 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:20,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [479736078] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:20,837 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:20,837 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 17:52:20,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763498574] [2021-05-02 17:52:20,837 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 17:52:20,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:20,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 17:52:20,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 17:52:20,838 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:21,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:21,344 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2021-05-02 17:52:21,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 17:52:21,345 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-05-02 17:52:21,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:21,345 INFO L225 Difference]: With dead ends: 60 [2021-05-02 17:52:21,345 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 17:52:21,346 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 25 SyntacticMatches, 10 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 512.4ms TimeCoverageRelationStatistics Valid=117, Invalid=695, Unknown=0, NotChecked=0, Total=812 [2021-05-02 17:52:21,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 17:52:21,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2021-05-02 17:52:21,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:21,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2021-05-02 17:52:21,347 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 33 [2021-05-02 17:52:21,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:21,347 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2021-05-02 17:52:21,347 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:21,348 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2021-05-02 17:52:21,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 17:52:21,348 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:21,348 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:21,550 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:21,551 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:21,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:21,551 INFO L82 PathProgramCache]: Analyzing trace with hash -1063807026, now seen corresponding path program 12 times [2021-05-02 17:52:21,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:21,551 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672618425] [2021-05-02 17:52:21,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:21,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:21,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:21,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:21,722 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:21,722 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:21,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672618425] [2021-05-02 17:52:21,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672618425] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:21,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [393736765] [2021-05-02 17:52:21,722 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:21,896 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 17:52:21,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:21,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 17:52:21,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:21,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:21,961 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:21,961 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [393736765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:21,961 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:21,961 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 17:52:21,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1343585752] [2021-05-02 17:52:21,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 17:52:21,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:21,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 17:52:21,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 17:52:21,962 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:22,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:22,498 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2021-05-02 17:52:22,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 17:52:22,499 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 17:52:22,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:22,499 INFO L225 Difference]: With dead ends: 62 [2021-05-02 17:52:22,499 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 17:52:22,500 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 457.1ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 17:52:22,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 17:52:22,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 17:52:22,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:22,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-02 17:52:22,501 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 35 [2021-05-02 17:52:22,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:22,502 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-02 17:52:22,502 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:22,502 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-02 17:52:22,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 17:52:22,503 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:22,503 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:22,706 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 17:52:22,706 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:22,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:22,706 INFO L82 PathProgramCache]: Analyzing trace with hash 184399810, now seen corresponding path program 12 times [2021-05-02 17:52:22,706 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:22,706 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [331353893] [2021-05-02 17:52:22,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:22,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:22,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:22,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:22,862 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:22,862 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:22,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [331353893] [2021-05-02 17:52:22,863 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [331353893] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:22,863 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [945791376] [2021-05-02 17:52:22,863 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:23,043 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-05-02 17:52:23,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:23,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 17:52:23,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:23,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:23,107 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:23,107 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [945791376] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:23,107 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:23,107 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 17:52:23,107 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867961487] [2021-05-02 17:52:23,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 17:52:23,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:23,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 17:52:23,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 17:52:23,108 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:23,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:23,665 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2021-05-02 17:52:23,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 17:52:23,665 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 17:52:23,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:23,665 INFO L225 Difference]: With dead ends: 64 [2021-05-02 17:52:23,666 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 17:52:23,666 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 509.8ms TimeCoverageRelationStatistics Valid=126, Invalid=804, Unknown=0, NotChecked=0, Total=930 [2021-05-02 17:52:23,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 17:52:23,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-02 17:52:23,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:23,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2021-05-02 17:52:23,668 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 35 [2021-05-02 17:52:23,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:23,668 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2021-05-02 17:52:23,668 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 16 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:23,668 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2021-05-02 17:52:23,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 17:52:23,668 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:23,668 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:23,871 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:23,872 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:23,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:23,872 INFO L82 PathProgramCache]: Analyzing trace with hash 794106220, now seen corresponding path program 13 times [2021-05-02 17:52:23,872 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:23,872 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633011358] [2021-05-02 17:52:23,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:23,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:24,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:24,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:24,045 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:24,045 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:24,045 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633011358] [2021-05-02 17:52:24,045 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1633011358] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:24,045 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [840463511] [2021-05-02 17:52:24,045 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:24,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:24,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 17:52:24,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:24,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:24,144 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:24,144 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [840463511] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:24,144 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:24,144 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 17:52:24,145 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163138029] [2021-05-02 17:52:24,145 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 17:52:24,145 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:24,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 17:52:24,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 17:52:24,145 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:24,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:24,756 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2021-05-02 17:52:24,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 17:52:24,757 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 17:52:24,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:24,757 INFO L225 Difference]: With dead ends: 66 [2021-05-02 17:52:24,757 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 17:52:24,757 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 511.5ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 17:52:24,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 17:52:24,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2021-05-02 17:52:24,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:24,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2021-05-02 17:52:24,759 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 37 [2021-05-02 17:52:24,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:24,759 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2021-05-02 17:52:24,759 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:24,759 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2021-05-02 17:52:24,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 17:52:24,759 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:24,759 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:24,974 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 17:52:24,974 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:24,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:24,974 INFO L82 PathProgramCache]: Analyzing trace with hash 2053629183, now seen corresponding path program 13 times [2021-05-02 17:52:24,974 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:24,974 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010558998] [2021-05-02 17:52:24,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:24,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:25,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:25,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:25,141 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:25,141 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:25,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010558998] [2021-05-02 17:52:25,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010558998] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:25,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [111672469] [2021-05-02 17:52:25,141 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:25,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:25,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 17:52:25,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:25,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:25,237 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:25,238 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [111672469] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:25,238 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:25,238 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 17:52:25,238 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55301539] [2021-05-02 17:52:25,238 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 17:52:25,238 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:25,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 17:52:25,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 17:52:25,238 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:25,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:25,830 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2021-05-02 17:52:25,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 17:52:25,830 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 17:52:25,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:25,831 INFO L225 Difference]: With dead ends: 68 [2021-05-02 17:52:25,831 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 17:52:25,831 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 531.3ms TimeCoverageRelationStatistics Valid=135, Invalid=921, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 17:52:25,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 17:52:25,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2021-05-02 17:52:25,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:25,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-05-02 17:52:25,833 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 37 [2021-05-02 17:52:25,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:25,833 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-05-02 17:52:25,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 17 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:25,833 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-05-02 17:52:25,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 17:52:25,833 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:25,833 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:26,048 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:26,048 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:26,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:26,049 INFO L82 PathProgramCache]: Analyzing trace with hash -457659510, now seen corresponding path program 14 times [2021-05-02 17:52:26,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:26,049 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490935447] [2021-05-02 17:52:26,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:26,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:26,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:26,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:26,232 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:26,233 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:26,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490935447] [2021-05-02 17:52:26,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490935447] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:26,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145825308] [2021-05-02 17:52:26,233 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:26,271 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:52:26,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:26,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 17:52:26,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:26,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:26,337 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:26,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [145825308] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:26,338 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:26,338 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 17:52:26,338 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256032010] [2021-05-02 17:52:26,338 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 17:52:26,338 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:26,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 17:52:26,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:52:26,339 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:26,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:26,978 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2021-05-02 17:52:26,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 17:52:26,979 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 17:52:26,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:26,979 INFO L225 Difference]: With dead ends: 70 [2021-05-02 17:52:26,979 INFO L226 Difference]: Without dead ends: 70 [2021-05-02 17:52:26,980 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 545.4ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 17:52:26,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-05-02 17:52:26,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2021-05-02 17:52:26,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 64 states have (on average 1.046875) internal successors, (67), 64 states have internal predecessors, (67), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:26,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-05-02 17:52:26,981 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 39 [2021-05-02 17:52:26,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:26,981 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-05-02 17:52:26,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:26,981 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-05-02 17:52:26,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 17:52:26,981 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:26,982 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:27,196 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 17:52:27,197 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:27,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:27,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1208240388, now seen corresponding path program 14 times [2021-05-02 17:52:27,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:27,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756343953] [2021-05-02 17:52:27,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:27,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:27,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:27,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:27,398 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:27,398 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:27,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756343953] [2021-05-02 17:52:27,398 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [756343953] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:27,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [994865900] [2021-05-02 17:52:27,398 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:27,440 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:52:27,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:27,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 17:52:27,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:27,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:27,507 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:27,507 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [994865900] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:27,507 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:27,507 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 17:52:27,507 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954644782] [2021-05-02 17:52:27,507 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 17:52:27,507 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:27,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 17:52:27,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 17:52:27,508 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:28,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:28,165 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2021-05-02 17:52:28,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 17:52:28,165 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 39 [2021-05-02 17:52:28,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:28,165 INFO L225 Difference]: With dead ends: 72 [2021-05-02 17:52:28,165 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 17:52:28,166 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 592.7ms TimeCoverageRelationStatistics Valid=144, Invalid=1046, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 17:52:28,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 17:52:28,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2021-05-02 17:52:28,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 66 states have (on average 1.0454545454545454) internal successors, (69), 66 states have internal predecessors, (69), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:28,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-05-02 17:52:28,167 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 39 [2021-05-02 17:52:28,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:28,167 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-05-02 17:52:28,167 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.0) internal successors, (38), 18 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:28,168 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-05-02 17:52:28,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 17:52:28,168 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:28,168 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:28,371 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:28,372 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:28,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:28,372 INFO L82 PathProgramCache]: Analyzing trace with hash -813683160, now seen corresponding path program 15 times [2021-05-02 17:52:28,372 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:28,372 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500728947] [2021-05-02 17:52:28,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:28,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:28,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:28,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:28,617 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:28,617 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:28,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500728947] [2021-05-02 17:52:28,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [500728947] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:28,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1587901817] [2021-05-02 17:52:28,617 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:28,765 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-02 17:52:28,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:28,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 17:52:28,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:28,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:28,837 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:28,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1587901817] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:28,838 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:28,838 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 17:52:28,838 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603491296] [2021-05-02 17:52:28,838 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 17:52:28,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:28,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 17:52:28,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:52:28,839 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:29,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:29,573 INFO L93 Difference]: Finished difference Result 74 states and 76 transitions. [2021-05-02 17:52:29,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 17:52:29,574 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 17:52:29,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:29,574 INFO L225 Difference]: With dead ends: 74 [2021-05-02 17:52:29,574 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 17:52:29,575 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 624.0ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 17:52:29,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 17:52:29,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-02 17:52:29,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:29,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2021-05-02 17:52:29,576 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 41 [2021-05-02 17:52:29,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:29,576 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2021-05-02 17:52:29,576 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:29,576 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2021-05-02 17:52:29,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 17:52:29,577 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:29,577 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:29,780 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 17:52:29,780 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:29,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:29,780 INFO L82 PathProgramCache]: Analyzing trace with hash -538772039, now seen corresponding path program 15 times [2021-05-02 17:52:29,780 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:29,780 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466526887] [2021-05-02 17:52:29,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:29,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:29,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:29,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:29,996 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:29,996 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:29,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466526887] [2021-05-02 17:52:29,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466526887] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:29,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436057048] [2021-05-02 17:52:29,996 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:30,167 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-02 17:52:30,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:30,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 17:52:30,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:30,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:30,250 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:30,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436057048] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:30,250 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:30,251 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 17:52:30,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942283588] [2021-05-02 17:52:30,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 17:52:30,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:30,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 17:52:30,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 17:52:30,251 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:30,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:30,975 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2021-05-02 17:52:30,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 17:52:30,976 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 17:52:30,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:30,976 INFO L225 Difference]: With dead ends: 76 [2021-05-02 17:52:30,976 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 17:52:30,976 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 665.9ms TimeCoverageRelationStatistics Valid=153, Invalid=1179, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 17:52:30,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 17:52:30,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2021-05-02 17:52:30,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:30,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2021-05-02 17:52:30,978 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 41 [2021-05-02 17:52:30,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:30,978 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2021-05-02 17:52:30,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.0) internal successors, (40), 19 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:30,978 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2021-05-02 17:52:30,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 17:52:30,978 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:30,978 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:31,182 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:31,182 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:31,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:31,182 INFO L82 PathProgramCache]: Analyzing trace with hash 644972870, now seen corresponding path program 16 times [2021-05-02 17:52:31,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:31,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595741119] [2021-05-02 17:52:31,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:31,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:31,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:31,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:31,412 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:31,412 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:31,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595741119] [2021-05-02 17:52:31,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [595741119] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:31,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331463646] [2021-05-02 17:52:31,412 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:31,485 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:52:31,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:31,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 17:52:31,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:31,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:31,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:31,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:31,950 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:31,950 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1331463646] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:31,950 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:31,950 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21] total 38 [2021-05-02 17:52:31,950 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156514527] [2021-05-02 17:52:31,951 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 17:52:31,951 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:31,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 17:52:31,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1286, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 17:52:31,952 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 38 states, 38 states have (on average 1.9473684210526316) internal successors, (74), 36 states have internal predecessors, (74), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:33,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:33,112 INFO L93 Difference]: Finished difference Result 78 states and 80 transitions. [2021-05-02 17:52:33,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 17:52:33,119 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.9473684210526316) internal successors, (74), 36 states have internal predecessors, (74), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 17:52:33,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:33,120 INFO L225 Difference]: With dead ends: 78 [2021-05-02 17:52:33,120 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 17:52:33,121 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 831 ImplicationChecksByTransitivity, 1246.4ms TimeCoverageRelationStatistics Valid=290, Invalid=3616, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 17:52:33,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 17:52:33,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2021-05-02 17:52:33,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:33,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-05-02 17:52:33,128 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 43 [2021-05-02 17:52:33,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:33,128 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-05-02 17:52:33,128 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 1.9473684210526316) internal successors, (74), 36 states have internal predecessors, (74), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:33,128 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-05-02 17:52:33,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 17:52:33,129 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:33,129 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:33,343 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 17:52:33,343 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:33,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:33,344 INFO L82 PathProgramCache]: Analyzing trace with hash -1424783050, now seen corresponding path program 16 times [2021-05-02 17:52:33,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:33,344 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924371769] [2021-05-02 17:52:33,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:33,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:33,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:33,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:33,674 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:33,674 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:33,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924371769] [2021-05-02 17:52:33,674 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924371769] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:33,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1207786606] [2021-05-02 17:52:33,674 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:33,709 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:52:33,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:33,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 17:52:33,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:33,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:33,792 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:33,792 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1207786606] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:33,792 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:33,792 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 17:52:33,792 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662676198] [2021-05-02 17:52:33,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 17:52:33,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:33,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 17:52:33,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 17:52:33,793 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:34,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:34,558 INFO L93 Difference]: Finished difference Result 80 states and 82 transitions. [2021-05-02 17:52:34,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 17:52:34,558 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 43 [2021-05-02 17:52:34,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:34,559 INFO L225 Difference]: With dead ends: 80 [2021-05-02 17:52:34,559 INFO L226 Difference]: Without dead ends: 80 [2021-05-02 17:52:34,559 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 733.6ms TimeCoverageRelationStatistics Valid=162, Invalid=1320, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 17:52:34,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-02 17:52:34,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2021-05-02 17:52:34,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:34,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2021-05-02 17:52:34,561 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 43 [2021-05-02 17:52:34,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:34,561 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2021-05-02 17:52:34,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.0) internal successors, (42), 20 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:34,561 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2021-05-02 17:52:34,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 17:52:34,561 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:34,561 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:34,776 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 17:52:34,776 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:34,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:34,777 INFO L82 PathProgramCache]: Analyzing trace with hash -2040888092, now seen corresponding path program 17 times [2021-05-02 17:52:34,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:34,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787754344] [2021-05-02 17:52:34,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:34,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:35,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:35,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:35,020 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:35,020 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:35,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787754344] [2021-05-02 17:52:35,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [787754344] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:35,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [144881686] [2021-05-02 17:52:35,020 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:36,553 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-05-02 17:52:36,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:36,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 17:52:36,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:36,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:36,788 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:36,788 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [144881686] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:36,788 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:36,788 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 17:52:36,788 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034994598] [2021-05-02 17:52:36,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 17:52:36,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:36,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 17:52:36,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 17:52:36,789 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:37,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:37,630 INFO L93 Difference]: Finished difference Result 82 states and 84 transitions. [2021-05-02 17:52:37,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 17:52:37,631 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 17:52:37,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:37,631 INFO L225 Difference]: With dead ends: 82 [2021-05-02 17:52:37,631 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 17:52:37,632 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 32 SyntacticMatches, 15 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 851.8ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 17:52:37,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 17:52:37,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2021-05-02 17:52:37,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:37,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2021-05-02 17:52:37,633 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 45 [2021-05-02 17:52:37,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:37,633 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2021-05-02 17:52:37,633 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:37,633 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2021-05-02 17:52:37,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 17:52:37,634 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:37,634 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:37,837 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 17:52:37,837 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:37,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:37,838 INFO L82 PathProgramCache]: Analyzing trace with hash 1817127283, now seen corresponding path program 17 times [2021-05-02 17:52:37,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:37,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1521065953] [2021-05-02 17:52:37,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:37,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:38,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:38,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:38,086 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:38,086 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:38,086 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1521065953] [2021-05-02 17:52:38,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1521065953] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:38,087 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633954287] [2021-05-02 17:52:38,087 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:38,508 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-05-02 17:52:38,508 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:38,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 17:52:38,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:38,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:38,655 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:38,655 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633954287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:38,655 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:38,655 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 17:52:38,655 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818069248] [2021-05-02 17:52:38,655 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 17:52:38,655 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:38,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 17:52:38,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 17:52:38,656 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:39,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:39,500 INFO L93 Difference]: Finished difference Result 84 states and 86 transitions. [2021-05-02 17:52:39,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 17:52:39,500 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 45 [2021-05-02 17:52:39,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:39,501 INFO L225 Difference]: With dead ends: 84 [2021-05-02 17:52:39,501 INFO L226 Difference]: Without dead ends: 84 [2021-05-02 17:52:39,501 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 36 SyntacticMatches, 11 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 178 ImplicationChecksByTransitivity, 825.7ms TimeCoverageRelationStatistics Valid=171, Invalid=1469, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 17:52:39,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-05-02 17:52:39,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2021-05-02 17:52:39,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 78 states have (on average 1.0384615384615385) internal successors, (81), 78 states have internal predecessors, (81), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:39,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-05-02 17:52:39,506 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 45 [2021-05-02 17:52:39,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:39,506 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-05-02 17:52:39,506 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.0) internal successors, (44), 21 states have internal predecessors, (44), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:39,506 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-05-02 17:52:39,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 17:52:39,506 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:39,506 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:39,709 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-05-02 17:52:39,709 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:39,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:39,709 INFO L82 PathProgramCache]: Analyzing trace with hash -1877927678, now seen corresponding path program 18 times [2021-05-02 17:52:39,709 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:39,710 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482432971] [2021-05-02 17:52:39,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:39,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:39,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:39,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:39,983 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:39,983 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:39,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [482432971] [2021-05-02 17:52:39,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [482432971] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:39,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27953303] [2021-05-02 17:52:39,983 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:40,265 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 17:52:40,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:40,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 17:52:40,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:40,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:40,374 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:40,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27953303] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:40,374 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:40,374 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 17:52:40,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218554028] [2021-05-02 17:52:40,375 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 17:52:40,375 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:40,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 17:52:40,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 17:52:40,375 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:41,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:41,346 INFO L93 Difference]: Finished difference Result 86 states and 88 transitions. [2021-05-02 17:52:41,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 17:52:41,346 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 17:52:41,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:41,346 INFO L225 Difference]: With dead ends: 86 [2021-05-02 17:52:41,347 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 17:52:41,347 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 804.8ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 17:52:41,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 17:52:41,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 17:52:41,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:41,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-05-02 17:52:41,349 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 47 [2021-05-02 17:52:41,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:41,349 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-05-02 17:52:41,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:41,349 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-05-02 17:52:41,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 17:52:41,349 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:41,349 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:41,552 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:41,552 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:41,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:41,553 INFO L82 PathProgramCache]: Analyzing trace with hash -853299600, now seen corresponding path program 18 times [2021-05-02 17:52:41,553 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:41,553 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410839446] [2021-05-02 17:52:41,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:41,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:41,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:41,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:41,826 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:41,826 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:41,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410839446] [2021-05-02 17:52:41,826 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410839446] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:41,826 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1264266835] [2021-05-02 17:52:41,826 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 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:42,111 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-05-02 17:52:42,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:42,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 17:52:42,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:42,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:42,192 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:42,193 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1264266835] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:42,193 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:42,193 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 17:52:42,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426827728] [2021-05-02 17:52:42,193 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 17:52:42,193 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:42,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 17:52:42,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 17:52:42,194 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:42,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:42,996 INFO L93 Difference]: Finished difference Result 88 states and 90 transitions. [2021-05-02 17:52:42,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 17:52:42,996 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 17:52:42,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:42,997 INFO L225 Difference]: With dead ends: 88 [2021-05-02 17:52:42,997 INFO L226 Difference]: Without dead ends: 88 [2021-05-02 17:52:42,998 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 756.0ms TimeCoverageRelationStatistics Valid=180, Invalid=1626, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 17:52:42,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-05-02 17:52:43,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2021-05-02 17:52:43,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:43,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-02 17:52:43,001 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 47 [2021-05-02 17:52:43,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:43,001 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-02 17:52:43,001 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.0) internal successors, (46), 22 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:43,002 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-02 17:52:43,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 17:52:43,002 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:43,002 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:43,205 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 17:52:43,205 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:43,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:43,205 INFO L82 PathProgramCache]: Analyzing trace with hash 108207520, now seen corresponding path program 19 times [2021-05-02 17:52:43,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:43,206 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168599862] [2021-05-02 17:52:43,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:43,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:43,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:43,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:43,502 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:43,502 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:43,502 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168599862] [2021-05-02 17:52:43,503 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1168599862] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:43,503 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334066035] [2021-05-02 17:52:43,503 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 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:43,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:43,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 17:52:43,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:43,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:43,677 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:43,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334066035] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:43,677 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:43,677 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 17:52:43,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364435981] [2021-05-02 17:52:43,677 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 17:52:43,677 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:43,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 17:52:43,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 17:52:43,678 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:44,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:44,633 INFO L93 Difference]: Finished difference Result 90 states and 92 transitions. [2021-05-02 17:52:44,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 17:52:44,633 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 17:52:44,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:44,634 INFO L225 Difference]: With dead ends: 90 [2021-05-02 17:52:44,634 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 17:52:44,634 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 789.1ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 17:52:44,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 17:52:44,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2021-05-02 17:52:44,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:44,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 91 transitions. [2021-05-02 17:52:44,636 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 91 transitions. Word has length 49 [2021-05-02 17:52:44,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:44,636 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 91 transitions. [2021-05-02 17:52:44,636 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:44,636 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 91 transitions. [2021-05-02 17:52:44,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 17:52:44,636 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:44,636 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:44,844 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-05-02 17:52:44,845 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:44,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:44,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1256908845, now seen corresponding path program 19 times [2021-05-02 17:52:44,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:44,845 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429152799] [2021-05-02 17:52:44,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:44,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:45,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:45,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:45,125 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:45,125 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:45,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429152799] [2021-05-02 17:52:45,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429152799] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:45,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972947157] [2021-05-02 17:52:45,125 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:45,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:45,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 17:52:45,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:45,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:45,248 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:45,248 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1972947157] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:45,248 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:45,248 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 17:52:45,248 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153190320] [2021-05-02 17:52:45,248 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 17:52:45,248 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:45,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 17:52:45,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 17:52:45,249 INFO L87 Difference]: Start difference. First operand 89 states and 91 transitions. Second operand has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:46,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:46,226 INFO L93 Difference]: Finished difference Result 92 states and 94 transitions. [2021-05-02 17:52:46,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 17:52:46,226 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 49 [2021-05-02 17:52:46,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:46,227 INFO L225 Difference]: With dead ends: 92 [2021-05-02 17:52:46,227 INFO L226 Difference]: Without dead ends: 92 [2021-05-02 17:52:46,227 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 850.5ms TimeCoverageRelationStatistics Valid=189, Invalid=1791, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 17:52:46,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-05-02 17:52:46,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2021-05-02 17:52:46,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 86 states have (on average 1.0348837209302326) internal successors, (89), 86 states have internal predecessors, (89), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:46,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2021-05-02 17:52:46,229 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 49 [2021-05-02 17:52:46,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:46,229 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2021-05-02 17:52:46,229 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.0) internal successors, (48), 23 states have internal predecessors, (48), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:46,229 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2021-05-02 17:52:46,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 17:52:46,229 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:46,229 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:46,444 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:46,445 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:46,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:46,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1818653374, now seen corresponding path program 20 times [2021-05-02 17:52:46,445 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:46,445 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004293482] [2021-05-02 17:52:46,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:46,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:46,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:46,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:46,761 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:46,761 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:46,761 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004293482] [2021-05-02 17:52:46,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2004293482] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:46,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [370791286] [2021-05-02 17:52:46,762 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:46,812 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:52:46,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:46,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 17:52:46,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:46,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:46,895 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:46,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [370791286] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:46,896 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:46,896 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 17:52:46,896 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213912506] [2021-05-02 17:52:46,896 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 17:52:46,896 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:46,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 17:52:46,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 17:52:46,897 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:47,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:47,839 INFO L93 Difference]: Finished difference Result 94 states and 96 transitions. [2021-05-02 17:52:47,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 17:52:47,839 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 17:52:47,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:47,844 INFO L225 Difference]: With dead ends: 94 [2021-05-02 17:52:47,844 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 17:52:47,844 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 786.3ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 17:52:47,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 17:52:47,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2021-05-02 17:52:47,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 88 states have (on average 1.0340909090909092) internal successors, (91), 88 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:47,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-05-02 17:52:47,849 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 51 [2021-05-02 17:52:47,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:47,850 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-05-02 17:52:47,850 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:47,850 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-05-02 17:52:47,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 17:52:47,850 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:47,850 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:48,064 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 17:52:48,065 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:48,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:48,065 INFO L82 PathProgramCache]: Analyzing trace with hash 1942660778, now seen corresponding path program 20 times [2021-05-02 17:52:48,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:48,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505994651] [2021-05-02 17:52:48,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:48,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:48,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:48,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:48,384 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:48,385 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:48,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505994651] [2021-05-02 17:52:48,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505994651] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:48,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117140632] [2021-05-02 17:52:48,385 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:48,443 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:52:48,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:48,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 17:52:48,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:48,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:48,528 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:48,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117140632] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:48,528 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:48,528 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 17:52:48,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223124602] [2021-05-02 17:52:48,529 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 17:52:48,529 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:48,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 17:52:48,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 17:52:48,529 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:49,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:49,596 INFO L93 Difference]: Finished difference Result 96 states and 98 transitions. [2021-05-02 17:52:49,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 17:52:49,597 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 51 [2021-05-02 17:52:49,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:49,597 INFO L225 Difference]: With dead ends: 96 [2021-05-02 17:52:49,597 INFO L226 Difference]: Without dead ends: 96 [2021-05-02 17:52:49,598 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 917.6ms TimeCoverageRelationStatistics Valid=198, Invalid=1964, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 17:52:49,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-05-02 17:52:49,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2021-05-02 17:52:49,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 90 states have (on average 1.0333333333333334) internal successors, (93), 90 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:49,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2021-05-02 17:52:49,599 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 51 [2021-05-02 17:52:49,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:49,599 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2021-05-02 17:52:49,599 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.0) internal successors, (50), 24 states have internal predecessors, (50), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:49,600 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2021-05-02 17:52:49,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 17:52:49,600 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:49,600 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:49,813 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:49,813 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:49,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:49,813 INFO L82 PathProgramCache]: Analyzing trace with hash 584644700, now seen corresponding path program 21 times [2021-05-02 17:52:49,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:49,813 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956872210] [2021-05-02 17:52:49,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:49,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:50,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:50,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:50,151 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:50,151 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:50,151 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956872210] [2021-05-02 17:52:50,151 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1956872210] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:50,151 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975617989] [2021-05-02 17:52:50,152 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:50,367 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-02 17:52:50,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:50,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 17:52:50,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:50,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:50,577 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:50,577 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975617989] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:50,577 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:50,577 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 17:52:50,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154001678] [2021-05-02 17:52:50,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 17:52:50,578 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:50,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 17:52:50,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 17:52:50,578 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:51,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:51,764 INFO L93 Difference]: Finished difference Result 98 states and 100 transitions. [2021-05-02 17:52:51,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 17:52:51,765 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 17:52:51,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:51,765 INFO L225 Difference]: With dead ends: 98 [2021-05-02 17:52:51,765 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 17:52:51,766 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 47 SyntacticMatches, 8 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 1085.4ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 17:52:51,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 17:52:51,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2021-05-02 17:52:51,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:51,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2021-05-02 17:52:51,767 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 53 [2021-05-02 17:52:51,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:51,767 INFO L480 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2021-05-02 17:52:51,767 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:51,768 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2021-05-02 17:52:51,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 17:52:51,768 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:51,768 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:51,971 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 17:52:51,972 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:51,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:51,972 INFO L82 PathProgramCache]: Analyzing trace with hash -474695193, now seen corresponding path program 21 times [2021-05-02 17:52:51,972 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:51,972 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346256901] [2021-05-02 17:52:51,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:51,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:52,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:52,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:52,299 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:52,299 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:52,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346256901] [2021-05-02 17:52:52,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346256901] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:52,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1608193525] [2021-05-02 17:52:52,299 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 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:52,566 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-02 17:52:52,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:52,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 17:52:52,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:52,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:52,814 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:52,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1608193525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:52,814 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:52,814 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 17:52:52,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253674928] [2021-05-02 17:52:52,815 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 17:52:52,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:52,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 17:52:52,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 17:52:52,815 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:53,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:53,882 INFO L93 Difference]: Finished difference Result 100 states and 102 transitions. [2021-05-02 17:52:53,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 17:52:53,883 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 17:52:53,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:53,883 INFO L225 Difference]: With dead ends: 100 [2021-05-02 17:52:53,883 INFO L226 Difference]: Without dead ends: 100 [2021-05-02 17:52:53,884 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 44 SyntacticMatches, 11 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 1070.7ms TimeCoverageRelationStatistics Valid=207, Invalid=2145, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 17:52:53,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-05-02 17:52:53,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2021-05-02 17:52:53,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:53,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2021-05-02 17:52:53,885 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 53 [2021-05-02 17:52:53,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:53,886 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2021-05-02 17:52:53,886 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.0) internal successors, (52), 25 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:53,886 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2021-05-02 17:52:53,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 17:52:53,886 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:53,886 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:54,086 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-02 17:52:54,087 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:54,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:54,087 INFO L82 PathProgramCache]: Analyzing trace with hash 113282682, now seen corresponding path program 22 times [2021-05-02 17:52:54,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:54,087 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628733043] [2021-05-02 17:52:54,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:54,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:54,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:54,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:54,457 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:54,457 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:54,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628733043] [2021-05-02 17:52:54,457 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [628733043] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:54,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993363953] [2021-05-02 17:52:54,457 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 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:54,501 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:52:54,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:54,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 17:52:54,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:55,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:55,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:55,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:55,239 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:55,239 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1993363953] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:55,239 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:55,239 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27] total 50 [2021-05-02 17:52:55,240 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524308274] [2021-05-02 17:52:55,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 17:52:55,240 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:55,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 17:52:55,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=2288, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 17:52:55,241 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 50 states, 50 states have (on average 1.96) internal successors, (98), 48 states have internal predecessors, (98), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:57,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:57,195 INFO L93 Difference]: Finished difference Result 102 states and 104 transitions. [2021-05-02 17:52:57,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 17:52:57,196 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.96) internal successors, (98), 48 states have internal predecessors, (98), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 17:52:57,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:57,196 INFO L225 Difference]: With dead ends: 102 [2021-05-02 17:52:57,196 INFO L226 Difference]: Without dead ends: 102 [2021-05-02 17:52:57,198 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1554 ImplicationChecksByTransitivity, 1994.2ms TimeCoverageRelationStatistics Valid=395, Invalid=6577, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 17:52:57,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-02 17:52:57,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2021-05-02 17:52:57,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:57,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2021-05-02 17:52:57,199 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 55 [2021-05-02 17:52:57,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:57,199 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2021-05-02 17:52:57,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 1.96) internal successors, (98), 48 states have internal predecessors, (98), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:57,199 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2021-05-02 17:52:57,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-05-02 17:52:57,200 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:57,200 INFO L523 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:57,408 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 17:52:57,409 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:57,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:57,409 INFO L82 PathProgramCache]: Analyzing trace with hash 23523812, now seen corresponding path program 22 times [2021-05-02 17:52:57,409 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:57,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026043286] [2021-05-02 17:52:57,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:57,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:57,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:57,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:57,780 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:57,780 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:57,780 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026043286] [2021-05-02 17:52:57,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026043286] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:57,780 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [971981421] [2021-05-02 17:52:57,780 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 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:52:57,825 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:52:57,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:52:57,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 17:52:57,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:52:57,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:52:57,916 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:57,916 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [971981421] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:57,916 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:52:57,916 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2021-05-02 17:52:57,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818150847] [2021-05-02 17:52:57,917 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 17:52:57,917 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:52:57,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 17:52:57,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2021-05-02 17:52:57,917 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:59,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:52:59,191 INFO L93 Difference]: Finished difference Result 104 states and 106 transitions. [2021-05-02 17:52:59,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 17:52:59,192 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 55 [2021-05-02 17:52:59,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:52:59,192 INFO L225 Difference]: With dead ends: 104 [2021-05-02 17:52:59,192 INFO L226 Difference]: Without dead ends: 104 [2021-05-02 17:52:59,192 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 258 ImplicationChecksByTransitivity, 1108.0ms TimeCoverageRelationStatistics Valid=216, Invalid=2334, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 17:52:59,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2021-05-02 17:52:59,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2021-05-02 17:52:59,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.030612244897959) internal successors, (101), 98 states have internal predecessors, (101), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:59,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-02 17:52:59,194 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 55 [2021-05-02 17:52:59,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:52:59,194 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-02 17:52:59,194 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.0) internal successors, (54), 26 states have internal predecessors, (54), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:52:59,194 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-02 17:52:59,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 17:52:59,194 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:52:59,195 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:52:59,405 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2021-05-02 17:52:59,405 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:52:59,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:52:59,407 INFO L82 PathProgramCache]: Analyzing trace with hash -1894050536, now seen corresponding path program 23 times [2021-05-02 17:52:59,407 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:52:59,407 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725982926] [2021-05-02 17:52:59,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:52:59,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:59,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:52:59,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:52:59,757 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:52:59,757 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:52:59,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725982926] [2021-05-02 17:52:59,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1725982926] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:52:59,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966007813] [2021-05-02 17:52:59,758 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 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:00,825 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2021-05-02 17:53:00,825 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:00,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 72 conjunts are in the unsatisfiable core [2021-05-02 17:53:00,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:01,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:01,231 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:01,231 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966007813] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:01,231 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:01,231 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 17:53:01,231 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59926494] [2021-05-02 17:53:01,231 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 17:53:01,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:01,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 17:53:01,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 17:53:01,232 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:02,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:02,679 INFO L93 Difference]: Finished difference Result 106 states and 108 transitions. [2021-05-02 17:53:02,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 17:53:02,679 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 17:53:02,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:02,680 INFO L225 Difference]: With dead ends: 106 [2021-05-02 17:53:02,680 INFO L226 Difference]: Without dead ends: 106 [2021-05-02 17:53:02,680 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 35 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 1354.7ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 17:53:02,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-05-02 17:53:02,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2021-05-02 17:53:02,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:02,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2021-05-02 17:53:02,698 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 57 [2021-05-02 17:53:02,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:02,698 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2021-05-02 17:53:02,698 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:02,698 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2021-05-02 17:53:02,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 17:53:02,698 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:02,699 INFO L523 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:02,902 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,46 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:02,902 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:02,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:02,902 INFO L82 PathProgramCache]: Analyzing trace with hash 2070617761, now seen corresponding path program 23 times [2021-05-02 17:53:02,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:02,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321736304] [2021-05-02 17:53:02,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:02,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:03,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:03,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:03,358 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:03,358 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:03,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1321736304] [2021-05-02 17:53:03,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1321736304] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:03,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1470722] [2021-05-02 17:53:03,358 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 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:05,635 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2021-05-02 17:53:05,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:05,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 17:53:05,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:05,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:06,001 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:06,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1470722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:06,002 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:06,002 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 17:53:06,002 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138067512] [2021-05-02 17:53:06,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 17:53:06,002 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:06,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 17:53:06,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 17:53:06,003 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:07,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:07,254 INFO L93 Difference]: Finished difference Result 108 states and 110 transitions. [2021-05-02 17:53:07,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 17:53:07,254 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 57 [2021-05-02 17:53:07,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:07,255 INFO L225 Difference]: With dead ends: 108 [2021-05-02 17:53:07,255 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 17:53:07,255 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 42 SyntacticMatches, 17 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 1354.4ms TimeCoverageRelationStatistics Valid=225, Invalid=2531, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 17:53:07,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 17:53:07,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2021-05-02 17:53:07,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:07,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2021-05-02 17:53:07,257 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 57 [2021-05-02 17:53:07,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:07,258 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2021-05-02 17:53:07,258 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 2.0) internal successors, (56), 27 states have internal predecessors, (56), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:07,258 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2021-05-02 17:53:07,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 17:53:07,258 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:07,258 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:07,462 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-05-02 17:53:07,462 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:07,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:07,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1794010166, now seen corresponding path program 24 times [2021-05-02 17:53:07,462 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:07,462 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4576311] [2021-05-02 17:53:07,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:07,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:07,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:07,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:07,806 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:07,806 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:07,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4576311] [2021-05-02 17:53:07,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [4576311] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:07,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845008381] [2021-05-02 17:53:07,806 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 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:08,391 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 17:53:08,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:08,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 17:53:08,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:08,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:08,555 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:08,555 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [845008381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:08,555 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:08,555 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 17:53:08,555 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260990215] [2021-05-02 17:53:08,555 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 17:53:08,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:08,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 17:53:08,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 17:53:08,556 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:09,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:09,861 INFO L93 Difference]: Finished difference Result 110 states and 112 transitions. [2021-05-02 17:53:09,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 17:53:09,862 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 17:53:09,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:09,868 INFO L225 Difference]: With dead ends: 110 [2021-05-02 17:53:09,868 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 17:53:09,868 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 52 SyntacticMatches, 9 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 320 ImplicationChecksByTransitivity, 1060.7ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 17:53:09,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 17:53:09,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2021-05-02 17:53:09,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:09,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-02 17:53:09,870 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 59 [2021-05-02 17:53:09,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:09,870 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-02 17:53:09,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:09,870 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-02 17:53:09,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 17:53:09,870 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:09,870 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:10,071 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:10,071 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:10,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:10,071 INFO L82 PathProgramCache]: Analyzing trace with hash -2062086114, now seen corresponding path program 24 times [2021-05-02 17:53:10,072 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:10,072 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1541648905] [2021-05-02 17:53:10,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:10,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:10,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:10,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:10,519 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:10,519 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:10,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1541648905] [2021-05-02 17:53:10,519 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1541648905] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:10,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [790952202] [2021-05-02 17:53:10,519 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 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:11,193 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 17:53:11,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:11,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 62 conjunts are in the unsatisfiable core [2021-05-02 17:53:11,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:11,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:11,474 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:11,475 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [790952202] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:11,475 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:11,475 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 17:53:11,475 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143372078] [2021-05-02 17:53:11,475 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 17:53:11,475 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:11,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 17:53:11,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 17:53:11,476 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:12,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:12,810 INFO L93 Difference]: Finished difference Result 112 states and 114 transitions. [2021-05-02 17:53:12,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 17:53:12,811 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 17:53:12,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:12,824 INFO L225 Difference]: With dead ends: 112 [2021-05-02 17:53:12,824 INFO L226 Difference]: Without dead ends: 112 [2021-05-02 17:53:12,825 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 49 SyntacticMatches, 12 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 1334.2ms TimeCoverageRelationStatistics Valid=234, Invalid=2736, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 17:53:12,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-05-02 17:53:12,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2021-05-02 17:53:12,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:12,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2021-05-02 17:53:12,842 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 59 [2021-05-02 17:53:12,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:12,842 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2021-05-02 17:53:12,842 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.0) internal successors, (58), 28 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:12,842 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2021-05-02 17:53:12,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 17:53:12,842 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:12,842 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:13,043 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-02 17:53:13,043 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:13,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:13,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1622641708, now seen corresponding path program 25 times [2021-05-02 17:53:13,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:13,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690923199] [2021-05-02 17:53:13,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:13,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:13,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:13,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:13,549 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:13,549 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:13,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690923199] [2021-05-02 17:53:13,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1690923199] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:13,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487922353] [2021-05-02 17:53:13,549 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 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:13,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:13,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 17:53:13,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:13,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:13,709 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:13,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487922353] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:13,709 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:13,709 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 17:53:13,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [277151538] [2021-05-02 17:53:13,710 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 17:53:13,710 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:13,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 17:53:13,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 17:53:13,718 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:15,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:15,330 INFO L93 Difference]: Finished difference Result 114 states and 116 transitions. [2021-05-02 17:53:15,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 17:53:15,330 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-02 17:53:15,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:15,331 INFO L225 Difference]: With dead ends: 114 [2021-05-02 17:53:15,331 INFO L226 Difference]: Without dead ends: 114 [2021-05-02 17:53:15,331 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1296.2ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 17:53:15,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-05-02 17:53:15,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2021-05-02 17:53:15,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 states have internal predecessors, (111), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:15,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2021-05-02 17:53:15,333 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 61 [2021-05-02 17:53:15,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:15,333 INFO L480 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2021-05-02 17:53:15,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:15,333 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2021-05-02 17:53:15,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 17:53:15,333 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:15,333 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:15,548 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-05-02 17:53:15,548 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:15,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:15,549 INFO L82 PathProgramCache]: Analyzing trace with hash -745761189, now seen corresponding path program 25 times [2021-05-02 17:53:15,549 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:15,549 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [251647529] [2021-05-02 17:53:15,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:15,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:16,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:16,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:16,005 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:16,005 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:16,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [251647529] [2021-05-02 17:53:16,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [251647529] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:16,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741292250] [2021-05-02 17:53:16,006 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 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:16,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:16,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 17:53:16,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:16,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:16,155 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:16,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741292250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:16,155 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:16,155 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 17:53:16,156 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065285627] [2021-05-02 17:53:16,156 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 17:53:16,156 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:16,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 17:53:16,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 17:53:16,156 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:17,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:17,718 INFO L93 Difference]: Finished difference Result 116 states and 118 transitions. [2021-05-02 17:53:17,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 17:53:17,719 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 61 [2021-05-02 17:53:17,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:17,719 INFO L225 Difference]: With dead ends: 116 [2021-05-02 17:53:17,719 INFO L226 Difference]: Without dead ends: 116 [2021-05-02 17:53:17,720 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 1331.2ms TimeCoverageRelationStatistics Valid=243, Invalid=2949, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 17:53:17,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2021-05-02 17:53:17,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2021-05-02 17:53:17,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 110 states have (on average 1.0272727272727273) internal successors, (113), 110 states have internal predecessors, (113), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:17,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2021-05-02 17:53:17,721 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 61 [2021-05-02 17:53:17,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:17,721 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2021-05-02 17:53:17,722 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.0) internal successors, (60), 29 states have internal predecessors, (60), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:17,722 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2021-05-02 17:53:17,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 17:53:17,722 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:17,722 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:17,937 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2021-05-02 17:53:17,937 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:17,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:17,937 INFO L82 PathProgramCache]: Analyzing trace with hash 624888818, now seen corresponding path program 26 times [2021-05-02 17:53:17,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:17,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1845758683] [2021-05-02 17:53:17,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:17,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:18,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:18,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:18,412 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:18,413 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:18,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1845758683] [2021-05-02 17:53:18,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1845758683] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:18,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890726752] [2021-05-02 17:53:18,413 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 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:18,467 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:53:18,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:18,469 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 17:53:18,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:18,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:18,573 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:18,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [890726752] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:18,573 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:18,573 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 17:53:18,573 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574198934] [2021-05-02 17:53:18,574 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 17:53:18,574 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:18,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 17:53:18,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 17:53:18,574 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:20,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:20,265 INFO L93 Difference]: Finished difference Result 118 states and 120 transitions. [2021-05-02 17:53:20,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 17:53:20,265 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-02 17:53:20,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:20,266 INFO L225 Difference]: With dead ends: 118 [2021-05-02 17:53:20,266 INFO L226 Difference]: Without dead ends: 118 [2021-05-02 17:53:20,266 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1308.7ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 17:53:20,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-02 17:53:20,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2021-05-02 17:53:20,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 112 states have (on average 1.0267857142857142) internal successors, (115), 112 states have internal predecessors, (115), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:20,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-05-02 17:53:20,269 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 63 [2021-05-02 17:53:20,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:20,269 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-05-02 17:53:20,269 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:20,269 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-05-02 17:53:20,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 17:53:20,269 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:20,269 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:20,481 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-05-02 17:53:20,481 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:20,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:20,481 INFO L82 PathProgramCache]: Analyzing trace with hash 1522106712, now seen corresponding path program 26 times [2021-05-02 17:53:20,481 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:20,481 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597177341] [2021-05-02 17:53:20,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:20,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:20,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:20,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:21,000 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:21,000 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:21,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597177341] [2021-05-02 17:53:21,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597177341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:21,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325624216] [2021-05-02 17:53:21,000 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 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:21,044 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:53:21,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:21,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 17:53:21,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:21,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:21,148 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:21,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1325624216] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:21,148 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:21,148 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 17:53:21,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383379640] [2021-05-02 17:53:21,148 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 17:53:21,148 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:21,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 17:53:21,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 17:53:21,149 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:22,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:22,792 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2021-05-02 17:53:22,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 17:53:22,793 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-02 17:53:22,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:22,793 INFO L225 Difference]: With dead ends: 120 [2021-05-02 17:53:22,793 INFO L226 Difference]: Without dead ends: 120 [2021-05-02 17:53:22,793 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 356 ImplicationChecksByTransitivity, 1430.2ms TimeCoverageRelationStatistics Valid=252, Invalid=3170, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 17:53:22,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-02 17:53:22,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2021-05-02 17:53:22,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 114 states have (on average 1.0263157894736843) internal successors, (117), 114 states have internal predecessors, (117), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:22,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-05-02 17:53:22,795 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 63 [2021-05-02 17:53:22,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:22,795 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-05-02 17:53:22,795 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 2.0) internal successors, (62), 30 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:22,795 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-05-02 17:53:22,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 17:53:22,796 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:22,796 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:23,010 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-05-02 17:53:23,011 INFO L428 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:23,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:23,011 INFO L82 PathProgramCache]: Analyzing trace with hash 133174416, now seen corresponding path program 27 times [2021-05-02 17:53:23,011 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:23,011 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933909420] [2021-05-02 17:53:23,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:23,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:23,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:23,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:23,516 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:23,516 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:23,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933909420] [2021-05-02 17:53:23,516 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933909420] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:23,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367577073] [2021-05-02 17:53:23,517 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 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:24,579 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-05-02 17:53:24,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:24,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 68 conjunts are in the unsatisfiable core [2021-05-02 17:53:24,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:24,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:24,927 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:24,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367577073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:24,927 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:24,927 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 17:53:24,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452983459] [2021-05-02 17:53:24,928 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 17:53:24,928 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:24,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 17:53:24,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 17:53:24,928 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:26,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:26,615 INFO L93 Difference]: Finished difference Result 122 states and 124 transitions. [2021-05-02 17:53:26,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 17:53:26,616 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 17:53:26,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:26,616 INFO L225 Difference]: With dead ends: 122 [2021-05-02 17:53:26,616 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 17:53:26,617 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 55 SyntacticMatches, 12 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 404 ImplicationChecksByTransitivity, 1561.9ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 17:53:26,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 17:53:26,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2021-05-02 17:53:26,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:26,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2021-05-02 17:53:26,618 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 65 [2021-05-02 17:53:26,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:26,618 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2021-05-02 17:53:26,618 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:26,618 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2021-05-02 17:53:26,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 17:53:26,619 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:26,619 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:26,819 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable60 [2021-05-02 17:53:26,819 INFO L428 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:26,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:26,820 INFO L82 PathProgramCache]: Analyzing trace with hash -900226795, now seen corresponding path program 27 times [2021-05-02 17:53:26,820 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:26,820 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240578144] [2021-05-02 17:53:26,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:26,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:27,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:27,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:27,339 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:27,339 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:27,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240578144] [2021-05-02 17:53:27,339 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240578144] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:27,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [76483968] [2021-05-02 17:53:27,339 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 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:27,624 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-05-02 17:53:27,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:27,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 17:53:27,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:27,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:27,905 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:27,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [76483968] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:27,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:27,905 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 17:53:27,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710028956] [2021-05-02 17:53:27,905 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 17:53:27,905 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:27,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 17:53:27,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 17:53:27,906 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:29,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:29,510 INFO L93 Difference]: Finished difference Result 124 states and 126 transitions. [2021-05-02 17:53:29,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 17:53:29,511 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 17:53:29,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:29,511 INFO L225 Difference]: With dead ends: 124 [2021-05-02 17:53:29,511 INFO L226 Difference]: Without dead ends: 124 [2021-05-02 17:53:29,512 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 59 SyntacticMatches, 8 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 397 ImplicationChecksByTransitivity, 1571.0ms TimeCoverageRelationStatistics Valid=261, Invalid=3399, Unknown=0, NotChecked=0, Total=3660 [2021-05-02 17:53:29,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-02 17:53:29,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2021-05-02 17:53:29,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:29,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 125 transitions. [2021-05-02 17:53:29,513 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 125 transitions. Word has length 65 [2021-05-02 17:53:29,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:29,513 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 125 transitions. [2021-05-02 17:53:29,513 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.0) internal successors, (64), 31 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:29,513 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 125 transitions. [2021-05-02 17:53:29,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 17:53:29,514 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:29,514 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:29,714 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,55 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:29,714 INFO L428 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:29,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:29,714 INFO L82 PathProgramCache]: Analyzing trace with hash 42036654, now seen corresponding path program 28 times [2021-05-02 17:53:29,715 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:29,715 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862190784] [2021-05-02 17:53:29,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:29,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:30,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:30,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:30,243 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:30,243 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:30,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862190784] [2021-05-02 17:53:30,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1862190784] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:30,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556256742] [2021-05-02 17:53:30,244 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 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:30,286 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:53:30,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:30,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 17:53:30,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:31,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:31,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:31,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:31,422 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:31,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [556256742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:31,422 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:31,422 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33] total 62 [2021-05-02 17:53:31,422 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627807887] [2021-05-02 17:53:31,423 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 17:53:31,423 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:31,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 17:53:31,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=3578, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 17:53:31,423 INFO L87 Difference]: Start difference. First operand 123 states and 125 transitions. Second operand has 62 states, 62 states have (on average 1.967741935483871) internal successors, (122), 60 states have internal predecessors, (122), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:34,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:34,289 INFO L93 Difference]: Finished difference Result 126 states and 128 transitions. [2021-05-02 17:53:34,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 17:53:34,289 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.967741935483871) internal successors, (122), 60 states have internal predecessors, (122), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-02 17:53:34,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:34,293 INFO L225 Difference]: With dead ends: 126 [2021-05-02 17:53:34,293 INFO L226 Difference]: Without dead ends: 126 [2021-05-02 17:53:34,294 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2502 ImplicationChecksByTransitivity, 2951.3ms TimeCoverageRelationStatistics Valid=500, Invalid=10420, Unknown=0, NotChecked=0, Total=10920 [2021-05-02 17:53:34,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2021-05-02 17:53:34,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2021-05-02 17:53:34,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:34,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2021-05-02 17:53:34,295 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 67 [2021-05-02 17:53:34,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:34,296 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2021-05-02 17:53:34,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 1.967741935483871) internal successors, (122), 60 states have internal predecessors, (122), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:34,296 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2021-05-02 17:53:34,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 17:53:34,296 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:34,296 INFO L523 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:34,511 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:34,511 INFO L428 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:34,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:34,511 INFO L82 PathProgramCache]: Analyzing trace with hash -890452590, now seen corresponding path program 28 times [2021-05-02 17:53:34,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:34,511 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746592169] [2021-05-02 17:53:34,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:34,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:35,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:35,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:35,061 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:35,061 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:35,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746592169] [2021-05-02 17:53:35,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746592169] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:35,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593403027] [2021-05-02 17:53:35,061 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 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:35,100 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:53:35,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:35,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 17:53:35,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:35,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:35,213 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:35,213 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [593403027] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:35,213 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:35,213 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-02 17:53:35,213 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106622985] [2021-05-02 17:53:35,213 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 17:53:35,213 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:35,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 17:53:35,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 17:53:35,214 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:36,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:36,750 INFO L93 Difference]: Finished difference Result 128 states and 130 transitions. [2021-05-02 17:53:36,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 17:53:36,750 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 67 [2021-05-02 17:53:36,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:36,751 INFO L225 Difference]: With dead ends: 128 [2021-05-02 17:53:36,751 INFO L226 Difference]: Without dead ends: 128 [2021-05-02 17:53:36,751 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 411 ImplicationChecksByTransitivity, 1335.5ms TimeCoverageRelationStatistics Valid=270, Invalid=3636, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 17:53:36,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-02 17:53:36,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2021-05-02 17:53:36,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 122 states have (on average 1.0245901639344261) internal successors, (125), 122 states have internal predecessors, (125), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:36,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2021-05-02 17:53:36,752 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 67 [2021-05-02 17:53:36,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:36,753 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2021-05-02 17:53:36,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:36,753 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2021-05-02 17:53:36,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 17:53:36,753 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:36,753 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:36,953 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,57 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:36,954 INFO L428 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:36,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:36,954 INFO L82 PathProgramCache]: Analyzing trace with hash -1642006708, now seen corresponding path program 29 times [2021-05-02 17:53:36,954 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:36,954 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090412822] [2021-05-02 17:53:36,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:36,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:37,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:37,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:37,533 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:37,533 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:37,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090412822] [2021-05-02 17:53:37,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1090412822] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:37,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [559429658] [2021-05-02 17:53:37,534 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 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:39,695 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2021-05-02 17:53:39,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:39,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 17:53:39,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:40,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:40,180 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:40,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [559429658] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:40,180 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:40,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 17:53:40,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871262889] [2021-05-02 17:53:40,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 17:53:40,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:40,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 17:53:40,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 17:53:40,181 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:42,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:42,040 INFO L93 Difference]: Finished difference Result 130 states and 132 transitions. [2021-05-02 17:53:42,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 17:53:42,040 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-02 17:53:42,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:42,041 INFO L225 Difference]: With dead ends: 130 [2021-05-02 17:53:42,041 INFO L226 Difference]: Without dead ends: 130 [2021-05-02 17:53:42,041 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 49 SyntacticMatches, 22 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 481 ImplicationChecksByTransitivity, 1848.7ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 17:53:42,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-05-02 17:53:42,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2021-05-02 17:53:42,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 124 states have (on average 1.0241935483870968) internal successors, (127), 124 states have internal predecessors, (127), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:42,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2021-05-02 17:53:42,043 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 69 [2021-05-02 17:53:42,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:42,043 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2021-05-02 17:53:42,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:42,043 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2021-05-02 17:53:42,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 17:53:42,043 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:42,043 INFO L523 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:42,243 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:42,244 INFO L428 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:42,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:42,244 INFO L82 PathProgramCache]: Analyzing trace with hash -87376177, now seen corresponding path program 29 times [2021-05-02 17:53:42,244 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:42,244 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299960256] [2021-05-02 17:53:42,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:42,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:42,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:42,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:42,819 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:42,819 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:42,820 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299960256] [2021-05-02 17:53:42,820 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [299960256] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:42,820 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [707752187] [2021-05-02 17:53:42,820 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 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:49,362 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2021-05-02 17:53:49,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:49,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-02 17:53:49,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:49,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:49,905 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:49,905 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [707752187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:49,905 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:49,906 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 17:53:49,906 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567753763] [2021-05-02 17:53:49,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 17:53:49,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:49,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 17:53:49,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 17:53:49,906 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:51,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:51,616 INFO L93 Difference]: Finished difference Result 132 states and 134 transitions. [2021-05-02 17:53:51,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 17:53:51,617 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 69 [2021-05-02 17:53:51,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:51,617 INFO L225 Difference]: With dead ends: 132 [2021-05-02 17:53:51,617 INFO L226 Difference]: Without dead ends: 132 [2021-05-02 17:53:51,618 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 43 SyntacticMatches, 28 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1902.0ms TimeCoverageRelationStatistics Valid=279, Invalid=3881, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 17:53:51,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-02 17:53:51,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2021-05-02 17:53:51,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 126 states have (on average 1.0238095238095237) internal successors, (129), 126 states have internal predecessors, (129), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:51,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2021-05-02 17:53:51,619 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 69 [2021-05-02 17:53:51,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:51,619 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2021-05-02 17:53:51,619 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.0) internal successors, (68), 33 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:51,619 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2021-05-02 17:53:51,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 17:53:51,620 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:51,620 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:51,820 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-05-02 17:53:51,820 INFO L428 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:51,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:51,821 INFO L82 PathProgramCache]: Analyzing trace with hash -805006998, now seen corresponding path program 30 times [2021-05-02 17:53:51,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:51,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682233747] [2021-05-02 17:53:51,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:51,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:52,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:52,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:52,446 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:52,446 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:52,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682233747] [2021-05-02 17:53:52,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1682233747] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:52,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877302904] [2021-05-02 17:53:52,446 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 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:54,050 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 17:53:54,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:54,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 68 conjunts are in the unsatisfiable core [2021-05-02 17:53:54,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:54,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:54,277 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:54,278 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1877302904] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:54,278 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:54,278 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 17:53:54,278 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775371069] [2021-05-02 17:53:54,278 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 17:53:54,278 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:54,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 17:53:54,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 17:53:54,278 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:56,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:53:56,050 INFO L93 Difference]: Finished difference Result 134 states and 136 transitions. [2021-05-02 17:53:56,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 17:53:56,050 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-02 17:53:56,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:53:56,051 INFO L225 Difference]: With dead ends: 134 [2021-05-02 17:53:56,051 INFO L226 Difference]: Without dead ends: 134 [2021-05-02 17:53:56,051 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 67 SyntacticMatches, 6 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 479 ImplicationChecksByTransitivity, 1546.5ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 17:53:56,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-05-02 17:53:56,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 133. [2021-05-02 17:53:56,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:56,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-02 17:53:56,053 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 71 [2021-05-02 17:53:56,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:53:56,053 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-02 17:53:56,053 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:53:56,053 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-02 17:53:56,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 17:53:56,055 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:53:56,055 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:53:56,259 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,60 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:56,259 INFO L428 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:53:56,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:53:56,259 INFO L82 PathProgramCache]: Analyzing trace with hash -1425056564, now seen corresponding path program 30 times [2021-05-02 17:53:56,259 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:53:56,260 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1269109260] [2021-05-02 17:53:56,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:53:56,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:56,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:53:56,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:53:56,880 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:56,880 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:53:56,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1269109260] [2021-05-02 17:53:56,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1269109260] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:56,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260347509] [2021-05-02 17:53:56,880 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 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:53:58,379 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 17:53:58,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:53:58,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 84 conjunts are in the unsatisfiable core [2021-05-02 17:53:58,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:53:58,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:53:58,927 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:53:58,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [260347509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:53:58,927 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:53:58,927 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 17:53:58,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747399839] [2021-05-02 17:53:58,927 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 17:53:58,927 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:53:58,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 17:53:58,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 17:53:58,928 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:00,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:00,819 INFO L93 Difference]: Finished difference Result 136 states and 138 transitions. [2021-05-02 17:54:00,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 17:54:00,820 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-02 17:54:00,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:00,820 INFO L225 Difference]: With dead ends: 136 [2021-05-02 17:54:00,820 INFO L226 Difference]: Without dead ends: 136 [2021-05-02 17:54:00,821 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 51 SyntacticMatches, 22 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 2015.8ms TimeCoverageRelationStatistics Valid=288, Invalid=4134, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 17:54:00,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-05-02 17:54:00,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2021-05-02 17:54:00,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 135 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:00,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2021-05-02 17:54:00,822 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 71 [2021-05-02 17:54:00,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:00,822 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2021-05-02 17:54:00,822 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.0) internal successors, (70), 34 states have internal predecessors, (70), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:00,823 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2021-05-02 17:54:00,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 17:54:00,823 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:00,823 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:01,023 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2021-05-02 17:54:01,024 INFO L428 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:01,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:01,024 INFO L82 PathProgramCache]: Analyzing trace with hash 392829960, now seen corresponding path program 31 times [2021-05-02 17:54:01,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:01,024 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1398265914] [2021-05-02 17:54:01,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:01,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:01,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:01,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:01,593 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:01,593 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:01,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1398265914] [2021-05-02 17:54:01,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1398265914] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:01,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908465093] [2021-05-02 17:54:01,593 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 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:01,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:01,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 17:54:01,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:54:01,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:01,762 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:01,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908465093] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:01,762 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:54:01,762 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 17:54:01,762 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202722630] [2021-05-02 17:54:01,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 17:54:01,763 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:01,763 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 17:54:01,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 17:54:01,763 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:03,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:03,913 INFO L93 Difference]: Finished difference Result 138 states and 140 transitions. [2021-05-02 17:54:03,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 17:54:03,913 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-02 17:54:03,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:03,914 INFO L225 Difference]: With dead ends: 138 [2021-05-02 17:54:03,914 INFO L226 Difference]: Without dead ends: 138 [2021-05-02 17:54:03,914 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1588.7ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 17:54:03,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-02 17:54:03,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2021-05-02 17:54:03,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 states have internal predecessors, (135), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:03,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 139 transitions. [2021-05-02 17:54:03,916 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 139 transitions. Word has length 73 [2021-05-02 17:54:03,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:03,916 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 139 transitions. [2021-05-02 17:54:03,916 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:03,916 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 139 transitions. [2021-05-02 17:54:03,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 17:54:03,916 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:03,916 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:04,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable69,62 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:04,117 INFO L428 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:04,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:04,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1554280329, now seen corresponding path program 31 times [2021-05-02 17:54:04,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:04,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691773404] [2021-05-02 17:54:04,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:04,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:04,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:04,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:04,735 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:04,735 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:04,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691773404] [2021-05-02 17:54:04,735 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [691773404] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:04,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772416652] [2021-05-02 17:54:04,735 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 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:04,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:04,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 17:54:04,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:54:04,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:04,896 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:04,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772416652] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:04,896 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:54:04,896 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 17:54:04,896 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669104655] [2021-05-02 17:54:04,896 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 17:54:04,897 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:04,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 17:54:04,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 17:54:04,897 INFO L87 Difference]: Start difference. First operand 137 states and 139 transitions. Second operand has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:06,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:06,839 INFO L93 Difference]: Finished difference Result 140 states and 142 transitions. [2021-05-02 17:54:06,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 17:54:06,839 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 73 [2021-05-02 17:54:06,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:06,840 INFO L225 Difference]: With dead ends: 140 [2021-05-02 17:54:06,840 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 17:54:06,840 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 501 ImplicationChecksByTransitivity, 1695.4ms TimeCoverageRelationStatistics Valid=297, Invalid=4395, Unknown=0, NotChecked=0, Total=4692 [2021-05-02 17:54:06,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 17:54:06,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-02 17:54:06,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:06,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-02 17:54:06,842 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 73 [2021-05-02 17:54:06,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:06,842 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-02 17:54:06,842 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 2.0) internal successors, (72), 35 states have internal predecessors, (72), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:06,842 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-02 17:54:06,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 17:54:06,842 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:06,842 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:07,043 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,63 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:07,043 INFO L428 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:07,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:07,043 INFO L82 PathProgramCache]: Analyzing trace with hash 462911270, now seen corresponding path program 32 times [2021-05-02 17:54:07,043 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:07,043 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65575944] [2021-05-02 17:54:07,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:07,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:07,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:07,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:07,683 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:07,683 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:07,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65575944] [2021-05-02 17:54:07,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65575944] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:07,684 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [116566337] [2021-05-02 17:54:07,684 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:07,735 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:54:07,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:54:07,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 17:54:07,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:54:07,859 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:07,864 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:07,864 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [116566337] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:07,864 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:54:07,864 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 17:54:07,864 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494833244] [2021-05-02 17:54:07,864 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 17:54:07,864 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:07,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 17:54:07,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 17:54:07,865 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:09,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:09,982 INFO L93 Difference]: Finished difference Result 142 states and 144 transitions. [2021-05-02 17:54:09,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 17:54:09,982 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-02 17:54:09,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:09,983 INFO L225 Difference]: With dead ends: 142 [2021-05-02 17:54:09,983 INFO L226 Difference]: Without dead ends: 142 [2021-05-02 17:54:09,983 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 1640.4ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 17:54:09,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-05-02 17:54:09,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 141. [2021-05-02 17:54:09,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 136 states have (on average 1.0220588235294117) internal successors, (139), 136 states have internal predecessors, (139), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:09,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-05-02 17:54:09,985 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 75 [2021-05-02 17:54:09,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:09,985 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-05-02 17:54:09,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:09,985 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-05-02 17:54:09,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 17:54:09,985 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:09,985 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:10,186 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,64 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:10,186 INFO L428 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:10,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:10,186 INFO L82 PathProgramCache]: Analyzing trace with hash -46151930, now seen corresponding path program 32 times [2021-05-02 17:54:10,186 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:10,186 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1001143444] [2021-05-02 17:54:10,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:10,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:10,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:10,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:10,831 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:10,832 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:10,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1001143444] [2021-05-02 17:54:10,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1001143444] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:10,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796516992] [2021-05-02 17:54:10,832 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 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:10,878 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:54:10,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:54:10,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 17:54:10,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:54:11,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:11,013 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:11,013 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796516992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:11,013 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:54:11,013 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 17:54:11,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594009761] [2021-05-02 17:54:11,014 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 17:54:11,014 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:11,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 17:54:11,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 17:54:11,014 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:13,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:13,071 INFO L93 Difference]: Finished difference Result 144 states and 146 transitions. [2021-05-02 17:54:13,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 17:54:13,071 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 75 [2021-05-02 17:54:13,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:13,072 INFO L225 Difference]: With dead ends: 144 [2021-05-02 17:54:13,072 INFO L226 Difference]: Without dead ends: 144 [2021-05-02 17:54:13,072 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 533 ImplicationChecksByTransitivity, 1788.5ms TimeCoverageRelationStatistics Valid=306, Invalid=4664, Unknown=0, NotChecked=0, Total=4970 [2021-05-02 17:54:13,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2021-05-02 17:54:13,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 143. [2021-05-02 17:54:13,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 138 states have (on average 1.0217391304347827) internal successors, (141), 138 states have internal predecessors, (141), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:13,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-05-02 17:54:13,073 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 75 [2021-05-02 17:54:13,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:13,074 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-05-02 17:54:13,074 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 2.0) internal successors, (74), 36 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:13,074 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-05-02 17:54:13,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 17:54:13,074 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:13,074 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:13,274 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,65 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:13,275 INFO L428 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:13,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:13,275 INFO L82 PathProgramCache]: Analyzing trace with hash -908426556, now seen corresponding path program 33 times [2021-05-02 17:54:13,275 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:13,275 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1313842479] [2021-05-02 17:54:13,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:13,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:13,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:13,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:13,936 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:13,936 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:13,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1313842479] [2021-05-02 17:54:13,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1313842479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:13,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913862929] [2021-05-02 17:54:13,937 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 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:14,741 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-05-02 17:54:14,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:54:14,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 17:54:14,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:54:15,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:15,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:15,169 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [913862929] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:15,169 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:54:15,169 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 17:54:15,169 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884373758] [2021-05-02 17:54:15,169 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 17:54:15,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:15,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 17:54:15,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 17:54:15,170 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:17,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:17,258 INFO L93 Difference]: Finished difference Result 146 states and 148 transitions. [2021-05-02 17:54:17,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 17:54:17,259 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-02 17:54:17,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:17,259 INFO L225 Difference]: With dead ends: 146 [2021-05-02 17:54:17,259 INFO L226 Difference]: Without dead ends: 146 [2021-05-02 17:54:17,260 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 65 SyntacticMatches, 14 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 591 ImplicationChecksByTransitivity, 1942.0ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 17:54:17,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-05-02 17:54:17,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2021-05-02 17:54:17,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 states have internal predecessors, (143), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:17,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2021-05-02 17:54:17,261 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 77 [2021-05-02 17:54:17,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:17,261 INFO L480 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2021-05-02 17:54:17,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:17,262 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2021-05-02 17:54:17,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 17:54:17,262 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:17,262 INFO L523 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:17,462 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable73 [2021-05-02 17:54:17,462 INFO L428 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:17,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:17,463 INFO L82 PathProgramCache]: Analyzing trace with hash -463260861, now seen corresponding path program 33 times [2021-05-02 17:54:17,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:17,463 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323403299] [2021-05-02 17:54:17,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:17,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:18,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:18,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:18,129 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:18,129 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:18,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323403299] [2021-05-02 17:54:18,129 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1323403299] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:18,130 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1298710136] [2021-05-02 17:54:18,130 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 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:18,851 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 34 check-sat command(s) [2021-05-02 17:54:18,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:54:18,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 17:54:18,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:54:19,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:19,020 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:19,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1298710136] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:19,020 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:54:19,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 17:54:19,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182094900] [2021-05-02 17:54:19,021 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 17:54:19,021 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:19,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 17:54:19,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 17:54:19,021 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:21,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:21,219 INFO L93 Difference]: Finished difference Result 148 states and 150 transitions. [2021-05-02 17:54:21,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 17:54:21,220 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 77 [2021-05-02 17:54:21,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:21,220 INFO L225 Difference]: With dead ends: 148 [2021-05-02 17:54:21,220 INFO L226 Difference]: Without dead ends: 148 [2021-05-02 17:54:21,221 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 77 SyntacticMatches, 2 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 568 ImplicationChecksByTransitivity, 1868.0ms TimeCoverageRelationStatistics Valid=315, Invalid=4941, Unknown=0, NotChecked=0, Total=5256 [2021-05-02 17:54:21,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-02 17:54:21,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2021-05-02 17:54:21,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:21,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 149 transitions. [2021-05-02 17:54:21,222 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 149 transitions. Word has length 77 [2021-05-02 17:54:21,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:21,222 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 149 transitions. [2021-05-02 17:54:21,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.0) internal successors, (76), 37 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:21,222 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 149 transitions. [2021-05-02 17:54:21,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-02 17:54:21,223 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:21,223 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:21,423 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,67 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:21,423 INFO L428 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:21,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:21,424 INFO L82 PathProgramCache]: Analyzing trace with hash -209117470, now seen corresponding path program 34 times [2021-05-02 17:54:21,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:21,424 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965256117] [2021-05-02 17:54:21,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:21,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:22,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:22,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:22,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:22,117 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:22,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965256117] [2021-05-02 17:54:22,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965256117] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:22,117 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [114600102] [2021-05-02 17:54:22,117 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 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:22,159 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:54:22,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:54:22,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-02 17:54:22,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:54:22,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:22,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:22,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:22,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:22,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:22,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:22,544 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [114600102] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:22,544 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:54:22,544 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 39] total 45 [2021-05-02 17:54:22,544 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385924336] [2021-05-02 17:54:22,545 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 17:54:22,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:22,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 17:54:22,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1850, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 17:54:22,545 INFO L87 Difference]: Start difference. First operand 147 states and 149 transitions. Second operand has 45 states, 45 states have (on average 1.9555555555555555) internal successors, (88), 43 states have internal predecessors, (88), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:24,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:24,983 INFO L93 Difference]: Finished difference Result 150 states and 152 transitions. [2021-05-02 17:54:24,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 17:54:24,984 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.9555555555555555) internal successors, (88), 43 states have internal predecessors, (88), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2021-05-02 17:54:24,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:24,984 INFO L225 Difference]: With dead ends: 150 [2021-05-02 17:54:24,984 INFO L226 Difference]: Without dead ends: 150 [2021-05-02 17:54:24,985 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 872 ImplicationChecksByTransitivity, 2117.4ms TimeCoverageRelationStatistics Valid=362, Invalid=6444, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 17:54:24,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-02 17:54:24,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2021-05-02 17:54:24,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:24,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 151 transitions. [2021-05-02 17:54:24,986 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 151 transitions. Word has length 79 [2021-05-02 17:54:24,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:24,986 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 151 transitions. [2021-05-02 17:54:24,986 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 1.9555555555555555) internal successors, (88), 43 states have internal predecessors, (88), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:24,986 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 151 transitions. [2021-05-02 17:54:24,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-02 17:54:24,987 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:24,987 INFO L523 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:25,202 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,68 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:25,203 INFO L428 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:25,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:25,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1872985024, now seen corresponding path program 34 times [2021-05-02 17:54:25,203 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:25,203 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744524392] [2021-05-02 17:54:25,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:25,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:25,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:25,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:25,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:25,927 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:25,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744524392] [2021-05-02 17:54:25,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744524392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:25,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246709274] [2021-05-02 17:54:25,927 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 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:25,972 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:54:25,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:54:25,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-02 17:54:25,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:54:26,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:26,109 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:26,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [246709274] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:26,109 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:54:26,109 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2021-05-02 17:54:26,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804431512] [2021-05-02 17:54:26,110 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 17:54:26,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:26,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 17:54:26,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 17:54:26,110 INFO L87 Difference]: Start difference. First operand 149 states and 151 transitions. Second operand has 39 states, 39 states have (on average 2.0) internal successors, (78), 38 states have internal predecessors, (78), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:28,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:28,414 INFO L93 Difference]: Finished difference Result 152 states and 154 transitions. [2021-05-02 17:54:28,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 17:54:28,415 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.0) internal successors, (78), 38 states have internal predecessors, (78), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 79 [2021-05-02 17:54:28,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:28,415 INFO L225 Difference]: With dead ends: 152 [2021-05-02 17:54:28,415 INFO L226 Difference]: Without dead ends: 152 [2021-05-02 17:54:28,416 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 80 SyntacticMatches, 1 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 600 ImplicationChecksByTransitivity, 1945.6ms TimeCoverageRelationStatistics Valid=324, Invalid=5226, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 17:54:28,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-02 17:54:28,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 151. [2021-05-02 17:54:28,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0205479452054795) internal successors, (149), 146 states have internal predecessors, (149), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:28,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 153 transitions. [2021-05-02 17:54:28,417 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 153 transitions. Word has length 79 [2021-05-02 17:54:28,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:28,418 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 153 transitions. [2021-05-02 17:54:28,418 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 2.0) internal successors, (78), 38 states have internal predecessors, (78), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:28,418 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 153 transitions. [2021-05-02 17:54:28,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 17:54:28,418 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:28,418 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:28,618 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-05-02 17:54:28,619 INFO L428 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:28,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:28,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1812016000, now seen corresponding path program 35 times [2021-05-02 17:54:28,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:28,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1740861284] [2021-05-02 17:54:28,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:28,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:29,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:29,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:29,343 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:29,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:29,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1740861284] [2021-05-02 17:54:29,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1740861284] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:29,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2077837051] [2021-05-02 17:54:29,343 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 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:38,146 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2021-05-02 17:54:38,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:54:38,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 105 conjunts are in the unsatisfiable core [2021-05-02 17:54:38,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:54:38,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:38,906 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:38,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2077837051] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:38,906 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:54:38,906 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-02 17:54:38,906 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878031599] [2021-05-02 17:54:38,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 17:54:38,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:38,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 17:54:38,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 17:54:38,907 INFO L87 Difference]: Start difference. First operand 151 states and 153 transitions. Second operand has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:41,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:41,520 INFO L93 Difference]: Finished difference Result 154 states and 156 transitions. [2021-05-02 17:54:41,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 17:54:41,521 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-05-02 17:54:41,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:41,521 INFO L225 Difference]: With dead ends: 154 [2021-05-02 17:54:41,521 INFO L226 Difference]: Without dead ends: 154 [2021-05-02 17:54:41,522 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 50 SyntacticMatches, 33 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 698 ImplicationChecksByTransitivity, 2542.2ms TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 17:54:41,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-05-02 17:54:41,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 153. [2021-05-02 17:54:41,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 148 states have (on average 1.0202702702702702) internal successors, (151), 148 states have internal predecessors, (151), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:41,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 155 transitions. [2021-05-02 17:54:41,523 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 155 transitions. Word has length 81 [2021-05-02 17:54:41,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:41,523 INFO L480 AbstractCegarLoop]: Abstraction has 153 states and 155 transitions. [2021-05-02 17:54:41,523 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:41,523 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 155 transitions. [2021-05-02 17:54:41,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 17:54:41,524 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:41,524 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:41,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2021-05-02 17:54:41,724 INFO L428 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:41,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:41,725 INFO L82 PathProgramCache]: Analyzing trace with hash 591759869, now seen corresponding path program 35 times [2021-05-02 17:54:41,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:41,725 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [425184476] [2021-05-02 17:54:41,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:41,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:42,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:42,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:42,459 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:42,459 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:42,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [425184476] [2021-05-02 17:54:42,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [425184476] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:42,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993613993] [2021-05-02 17:54:42,459 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 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:51,246 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 36 check-sat command(s) [2021-05-02 17:54:51,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:54:51,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 108 conjunts are in the unsatisfiable core [2021-05-02 17:54:51,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:54:52,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:52,055 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:52,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [993613993] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:52,055 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:54:52,055 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-02 17:54:52,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036246026] [2021-05-02 17:54:52,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 17:54:52,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:52,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 17:54:52,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 17:54:52,056 INFO L87 Difference]: Start difference. First operand 153 states and 155 transitions. Second operand has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:54,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:54:54,486 INFO L93 Difference]: Finished difference Result 156 states and 158 transitions. [2021-05-02 17:54:54,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 17:54:54,486 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-05-02 17:54:54,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:54:54,487 INFO L225 Difference]: With dead ends: 156 [2021-05-02 17:54:54,487 INFO L226 Difference]: Without dead ends: 156 [2021-05-02 17:54:54,487 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 47 SyntacticMatches, 36 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 704 ImplicationChecksByTransitivity, 2673.6ms TimeCoverageRelationStatistics Valid=333, Invalid=5519, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 17:54:54,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2021-05-02 17:54:54,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 155. [2021-05-02 17:54:54,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 150 states have (on average 1.02) internal successors, (153), 150 states have internal predecessors, (153), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:54,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2021-05-02 17:54:54,489 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 81 [2021-05-02 17:54:54,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:54:54,489 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2021-05-02 17:54:54,489 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 2.0) internal successors, (80), 39 states have internal predecessors, (80), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:54:54,489 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2021-05-02 17:54:54,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 17:54:54,489 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:54:54,490 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:54:54,690 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,71 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:54,690 INFO L428 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:54:54,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:54:54,690 INFO L82 PathProgramCache]: Analyzing trace with hash -1498904418, now seen corresponding path program 36 times [2021-05-02 17:54:54,690 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:54:54,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978130672] [2021-05-02 17:54:54,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:54:54,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:55,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:54:55,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:54:55,473 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:55,473 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:54:55,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978130672] [2021-05-02 17:54:55,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [978130672] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:55,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1164229145] [2021-05-02 17:54:55,474 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 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:54:59,299 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2021-05-02 17:54:59,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:54:59,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 99 conjunts are in the unsatisfiable core [2021-05-02 17:54:59,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:54:59,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:54:59,969 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:54:59,969 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1164229145] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:54:59,969 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:54:59,969 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 17:54:59,969 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432595150] [2021-05-02 17:54:59,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 17:54:59,970 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:54:59,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 17:54:59,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 17:54:59,970 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:02,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:02,739 INFO L93 Difference]: Finished difference Result 158 states and 160 transitions. [2021-05-02 17:55:02,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 17:55:02,740 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-02 17:55:02,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:02,740 INFO L225 Difference]: With dead ends: 158 [2021-05-02 17:55:02,740 INFO L226 Difference]: Without dead ends: 158 [2021-05-02 17:55:02,741 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 60 SyntacticMatches, 25 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 718 ImplicationChecksByTransitivity, 2569.3ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 17:55:02,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2021-05-02 17:55:02,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 157. [2021-05-02 17:55:02,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:02,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-05-02 17:55:02,742 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 83 [2021-05-02 17:55:02,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:02,742 INFO L480 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-05-02 17:55:02,742 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:02,743 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-05-02 17:55:02,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 17:55:02,743 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:02,743 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:02,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,72 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:02,943 INFO L428 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:02,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:02,944 INFO L82 PathProgramCache]: Analyzing trace with hash -1610345350, now seen corresponding path program 36 times [2021-05-02 17:55:02,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:02,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917772052] [2021-05-02 17:55:02,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:02,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:03,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:03,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:03,723 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:03,723 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:03,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917772052] [2021-05-02 17:55:03,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917772052] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:03,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779230837] [2021-05-02 17:55:03,723 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 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:05,495 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2021-05-02 17:55:05,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:05,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-02 17:55:05,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:06,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:06,119 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:06,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1779230837] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:06,119 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:06,119 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 17:55:06,119 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637265060] [2021-05-02 17:55:06,119 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 17:55:06,119 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:06,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 17:55:06,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 17:55:06,120 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:08,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:08,713 INFO L93 Difference]: Finished difference Result 160 states and 162 transitions. [2021-05-02 17:55:08,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 17:55:08,714 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-02 17:55:08,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:08,714 INFO L225 Difference]: With dead ends: 160 [2021-05-02 17:55:08,715 INFO L226 Difference]: Without dead ends: 160 [2021-05-02 17:55:08,715 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 65 SyntacticMatches, 20 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 709 ImplicationChecksByTransitivity, 2617.9ms TimeCoverageRelationStatistics Valid=342, Invalid=5820, Unknown=0, NotChecked=0, Total=6162 [2021-05-02 17:55:08,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-05-02 17:55:08,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2021-05-02 17:55:08,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:08,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 161 transitions. [2021-05-02 17:55:08,717 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 161 transitions. Word has length 83 [2021-05-02 17:55:08,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:08,717 INFO L480 AbstractCegarLoop]: Abstraction has 159 states and 161 transitions. [2021-05-02 17:55:08,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.0) internal successors, (82), 40 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:08,717 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 161 transitions. [2021-05-02 17:55:08,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 17:55:08,717 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:08,717 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:08,917 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,73 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:08,918 INFO L428 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:08,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:08,918 INFO L82 PathProgramCache]: Analyzing trace with hash -722659780, now seen corresponding path program 37 times [2021-05-02 17:55:08,919 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:08,919 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803473941] [2021-05-02 17:55:08,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:08,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:09,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:09,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:09,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:09,746 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:09,746 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803473941] [2021-05-02 17:55:09,746 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803473941] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:09,746 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317108664] [2021-05-02 17:55:09,746 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 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:09,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:09,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-02 17:55:09,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:09,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:09,977 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:09,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317108664] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:09,977 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:09,978 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 42 [2021-05-02 17:55:09,978 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050983127] [2021-05-02 17:55:09,978 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 17:55:09,978 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:09,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 17:55:09,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 17:55:09,978 INFO L87 Difference]: Start difference. First operand 159 states and 161 transitions. Second operand has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:12,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:12,884 INFO L93 Difference]: Finished difference Result 162 states and 164 transitions. [2021-05-02 17:55:12,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 17:55:12,885 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-02 17:55:12,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:12,885 INFO L225 Difference]: With dead ends: 162 [2021-05-02 17:55:12,885 INFO L226 Difference]: Without dead ends: 162 [2021-05-02 17:55:12,885 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 707 ImplicationChecksByTransitivity, 2207.0ms TimeCoverageRelationStatistics Valid=309, Invalid=6011, Unknown=0, NotChecked=0, Total=6320 [2021-05-02 17:55:12,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-05-02 17:55:12,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 161. [2021-05-02 17:55:12,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 states have internal predecessors, (159), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:12,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 163 transitions. [2021-05-02 17:55:12,887 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 163 transitions. Word has length 85 [2021-05-02 17:55:12,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:12,887 INFO L480 AbstractCegarLoop]: Abstraction has 161 states and 163 transitions. [2021-05-02 17:55:12,887 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:12,888 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 163 transitions. [2021-05-02 17:55:12,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 17:55:12,888 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:12,888 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:13,088 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,74 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:13,089 INFO L428 AbstractCegarLoop]: === Iteration 78 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:13,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:13,089 INFO L82 PathProgramCache]: Analyzing trace with hash -414583881, now seen corresponding path program 37 times [2021-05-02 17:55:13,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:13,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419818311] [2021-05-02 17:55:13,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:13,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:13,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:13,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:13,926 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:13,926 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:13,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419818311] [2021-05-02 17:55:13,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419818311] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:13,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1665558112] [2021-05-02 17:55:13,926 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 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:13,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:13,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-02 17:55:13,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:14,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:14,126 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:14,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1665558112] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:14,126 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:14,126 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 40] total 42 [2021-05-02 17:55:14,126 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [300684766] [2021-05-02 17:55:14,127 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 17:55:14,127 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:14,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 17:55:14,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 17:55:14,127 INFO L87 Difference]: Start difference. First operand 161 states and 163 transitions. Second operand has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:16,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:16,532 INFO L93 Difference]: Finished difference Result 164 states and 166 transitions. [2021-05-02 17:55:16,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 17:55:16,532 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 85 [2021-05-02 17:55:16,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:16,533 INFO L225 Difference]: With dead ends: 164 [2021-05-02 17:55:16,533 INFO L226 Difference]: Without dead ends: 164 [2021-05-02 17:55:16,533 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 708 ImplicationChecksByTransitivity, 2096.7ms TimeCoverageRelationStatistics Valid=351, Invalid=6129, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 17:55:16,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-02 17:55:16,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 163. [2021-05-02 17:55:16,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.018987341772152) internal successors, (161), 158 states have internal predecessors, (161), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:16,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 165 transitions. [2021-05-02 17:55:16,561 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 165 transitions. Word has length 85 [2021-05-02 17:55:16,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:16,561 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 165 transitions. [2021-05-02 17:55:16,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.0) internal successors, (84), 41 states have internal predecessors, (84), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:16,561 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 165 transitions. [2021-05-02 17:55:16,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-02 17:55:16,562 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:16,562 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:16,768 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable84 [2021-05-02 17:55:16,769 INFO L428 AbstractCegarLoop]: === Iteration 79 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:16,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:16,769 INFO L82 PathProgramCache]: Analyzing trace with hash -2075872166, now seen corresponding path program 38 times [2021-05-02 17:55:16,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:16,769 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389079353] [2021-05-02 17:55:16,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:16,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:17,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:17,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:17,646 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:17,647 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:17,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [389079353] [2021-05-02 17:55:17,647 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [389079353] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:17,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [770271088] [2021-05-02 17:55:17,647 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 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:17,700 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:55:17,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:17,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 79 conjunts are in the unsatisfiable core [2021-05-02 17:55:17,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:17,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:17,830 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:17,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [770271088] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:17,830 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:17,830 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41] total 43 [2021-05-02 17:55:17,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702749766] [2021-05-02 17:55:17,830 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 17:55:17,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:17,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 17:55:17,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 17:55:17,831 INFO L87 Difference]: Start difference. First operand 163 states and 165 transitions. Second operand has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:20,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:20,911 INFO L93 Difference]: Finished difference Result 166 states and 168 transitions. [2021-05-02 17:55:20,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-05-02 17:55:20,912 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 87 [2021-05-02 17:55:20,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:20,912 INFO L225 Difference]: With dead ends: 166 [2021-05-02 17:55:20,912 INFO L226 Difference]: Without dead ends: 166 [2021-05-02 17:55:20,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 745 ImplicationChecksByTransitivity, 2255.5ms TimeCoverageRelationStatistics Valid=317, Invalid=6325, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 17:55:20,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-05-02 17:55:20,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 165. [2021-05-02 17:55:20,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 160 states have (on average 1.01875) internal successors, (163), 160 states have internal predecessors, (163), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:20,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2021-05-02 17:55:20,914 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 87 [2021-05-02 17:55:20,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:20,914 INFO L480 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2021-05-02 17:55:20,914 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:20,914 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2021-05-02 17:55:20,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-02 17:55:20,915 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:20,915 INFO L523 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:21,115 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,76 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:21,115 INFO L428 AbstractCegarLoop]: === Iteration 80 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:21,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:21,115 INFO L82 PathProgramCache]: Analyzing trace with hash 1955919796, now seen corresponding path program 38 times [2021-05-02 17:55:21,116 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:21,116 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029109491] [2021-05-02 17:55:21,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:21,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:21,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:21,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:21,970 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:21,970 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:21,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029109491] [2021-05-02 17:55:21,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2029109491] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:21,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1533066448] [2021-05-02 17:55:21,970 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 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:22,029 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:55:22,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:22,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 79 conjunts are in the unsatisfiable core [2021-05-02 17:55:22,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:22,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:22,191 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:22,191 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1533066448] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:22,191 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:22,191 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 41] total 43 [2021-05-02 17:55:22,191 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128029938] [2021-05-02 17:55:22,191 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 17:55:22,191 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:22,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 17:55:22,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1684, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 17:55:22,192 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:25,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:25,014 INFO L93 Difference]: Finished difference Result 168 states and 170 transitions. [2021-05-02 17:55:25,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 17:55:25,014 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 87 [2021-05-02 17:55:25,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:25,015 INFO L225 Difference]: With dead ends: 168 [2021-05-02 17:55:25,015 INFO L226 Difference]: Without dead ends: 168 [2021-05-02 17:55:25,015 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 746 ImplicationChecksByTransitivity, 2371.7ms TimeCoverageRelationStatistics Valid=360, Invalid=6446, Unknown=0, NotChecked=0, Total=6806 [2021-05-02 17:55:25,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-05-02 17:55:25,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 167. [2021-05-02 17:55:25,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 162 states have (on average 1.0185185185185186) internal successors, (165), 162 states have internal predecessors, (165), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:25,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2021-05-02 17:55:25,017 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 87 [2021-05-02 17:55:25,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:25,017 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2021-05-02 17:55:25,017 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.0) internal successors, (86), 42 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:25,017 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2021-05-02 17:55:25,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 17:55:25,017 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:25,017 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:25,218 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86,77 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:25,218 INFO L428 AbstractCegarLoop]: === Iteration 81 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:25,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:25,218 INFO L82 PathProgramCache]: Analyzing trace with hash -1137884424, now seen corresponding path program 39 times [2021-05-02 17:55:25,218 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:25,218 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484903636] [2021-05-02 17:55:25,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:25,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:26,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:26,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:26,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:26,142 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:26,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [484903636] [2021-05-02 17:55:26,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [484903636] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:26,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623598391] [2021-05-02 17:55:26,143 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 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:27,061 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2021-05-02 17:55:27,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:27,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-02 17:55:27,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:27,637 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:27,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:27,643 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623598391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:27,643 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:27,643 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 17:55:27,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120041133] [2021-05-02 17:55:27,644 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 17:55:27,644 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:27,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 17:55:27,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 17:55:27,644 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:30,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:30,975 INFO L93 Difference]: Finished difference Result 170 states and 172 transitions. [2021-05-02 17:55:30,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 17:55:30,976 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-02 17:55:30,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:30,976 INFO L225 Difference]: With dead ends: 170 [2021-05-02 17:55:30,976 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 17:55:30,977 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 78 SyntacticMatches, 13 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 808 ImplicationChecksByTransitivity, 2867.4ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 17:55:30,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 17:55:30,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2021-05-02 17:55:30,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:30,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2021-05-02 17:55:30,978 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 89 [2021-05-02 17:55:30,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:30,978 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2021-05-02 17:55:30,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:30,978 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2021-05-02 17:55:30,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 17:55:30,979 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:30,979 INFO L523 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:31,179 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable87 [2021-05-02 17:55:31,179 INFO L428 AbstractCegarLoop]: === Iteration 82 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:31,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:31,180 INFO L82 PathProgramCache]: Analyzing trace with hash -617680783, now seen corresponding path program 39 times [2021-05-02 17:55:31,180 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:31,180 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708738136] [2021-05-02 17:55:31,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:31,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:32,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:32,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:32,003 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:32,003 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:32,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708738136] [2021-05-02 17:55:32,003 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1708738136] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:32,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585909518] [2021-05-02 17:55:32,003 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 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:33,370 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2021-05-02 17:55:33,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:33,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 104 conjunts are in the unsatisfiable core [2021-05-02 17:55:33,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:34,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:34,180 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:34,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585909518] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:34,180 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:34,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 17:55:34,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987897544] [2021-05-02 17:55:34,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 17:55:34,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:34,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 17:55:34,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 17:55:34,181 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:37,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:37,225 INFO L93 Difference]: Finished difference Result 172 states and 174 transitions. [2021-05-02 17:55:37,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 17:55:37,226 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-02 17:55:37,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:37,226 INFO L225 Difference]: With dead ends: 172 [2021-05-02 17:55:37,226 INFO L226 Difference]: Without dead ends: 172 [2021-05-02 17:55:37,227 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 67 SyntacticMatches, 24 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 831 ImplicationChecksByTransitivity, 3000.4ms TimeCoverageRelationStatistics Valid=369, Invalid=6771, Unknown=0, NotChecked=0, Total=7140 [2021-05-02 17:55:37,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-05-02 17:55:37,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2021-05-02 17:55:37,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 166 states have internal predecessors, (169), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:37,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 173 transitions. [2021-05-02 17:55:37,228 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 173 transitions. Word has length 89 [2021-05-02 17:55:37,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:37,228 INFO L480 AbstractCegarLoop]: Abstraction has 171 states and 173 transitions. [2021-05-02 17:55:37,228 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.0) internal successors, (88), 43 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:37,228 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 173 transitions. [2021-05-02 17:55:37,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 17:55:37,229 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:37,229 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:37,429 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable88 [2021-05-02 17:55:37,429 INFO L428 AbstractCegarLoop]: === Iteration 83 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:37,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:37,430 INFO L82 PathProgramCache]: Analyzing trace with hash -1674796522, now seen corresponding path program 40 times [2021-05-02 17:55:37,430 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:37,430 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373277530] [2021-05-02 17:55:37,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:37,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:38,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:38,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:38,384 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:38,384 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:38,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373277530] [2021-05-02 17:55:38,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373277530] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:38,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [792311004] [2021-05-02 17:55:38,384 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 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:38,424 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:55:38,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:38,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 17:55:38,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:40,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:40,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:40,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:40,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:40,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [792311004] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:40,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:40,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45] total 86 [2021-05-02 17:55:40,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391489486] [2021-05-02 17:55:40,704 INFO L460 AbstractCegarLoop]: Interpolant automaton has 86 states [2021-05-02 17:55:40,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:40,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2021-05-02 17:55:40,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=7022, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 17:55:40,704 INFO L87 Difference]: Start difference. First operand 171 states and 173 transitions. Second operand has 86 states, 86 states have (on average 1.9767441860465116) internal successors, (170), 84 states have internal predecessors, (170), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:46,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:46,639 INFO L93 Difference]: Finished difference Result 174 states and 176 transitions. [2021-05-02 17:55:46,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-05-02 17:55:46,640 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 86 states have (on average 1.9767441860465116) internal successors, (170), 84 states have internal predecessors, (170), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2021-05-02 17:55:46,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:46,640 INFO L225 Difference]: With dead ends: 174 [2021-05-02 17:55:46,640 INFO L226 Difference]: Without dead ends: 174 [2021-05-02 17:55:46,641 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5073 ImplicationChecksByTransitivity, 5587.6ms TimeCoverageRelationStatistics Valid=710, Invalid=20752, Unknown=0, NotChecked=0, Total=21462 [2021-05-02 17:55:46,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2021-05-02 17:55:46,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 173. [2021-05-02 17:55:46,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 168 states have (on average 1.0178571428571428) internal successors, (171), 168 states have internal predecessors, (171), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:46,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 175 transitions. [2021-05-02 17:55:46,654 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 175 transitions. Word has length 91 [2021-05-02 17:55:46,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:46,654 INFO L480 AbstractCegarLoop]: Abstraction has 173 states and 175 transitions. [2021-05-02 17:55:46,654 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 86 states, 86 states have (on average 1.9767441860465116) internal successors, (170), 84 states have internal predecessors, (170), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:46,654 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 175 transitions. [2021-05-02 17:55:46,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 17:55:46,654 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:46,655 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:46,855 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89,80 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:46,855 INFO L428 AbstractCegarLoop]: === Iteration 84 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:46,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:46,855 INFO L82 PathProgramCache]: Analyzing trace with hash 53325294, now seen corresponding path program 40 times [2021-05-02 17:55:46,856 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:46,856 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113687231] [2021-05-02 17:55:46,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:46,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:47,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:47,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:47,819 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:47,819 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:47,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113687231] [2021-05-02 17:55:47,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113687231] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:47,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446828284] [2021-05-02 17:55:47,819 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 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:47,889 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:55:47,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:55:47,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 83 conjunts are in the unsatisfiable core [2021-05-02 17:55:47,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:55:48,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:55:48,046 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:48,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [446828284] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:48,047 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:55:48,047 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 43] total 45 [2021-05-02 17:55:48,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056076350] [2021-05-02 17:55:48,047 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 17:55:48,047 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:55:48,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 17:55:48,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 17:55:48,048 INFO L87 Difference]: Start difference. First operand 173 states and 175 transitions. Second operand has 45 states, 45 states have (on average 2.0) internal successors, (90), 44 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:50,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:55:50,431 INFO L93 Difference]: Finished difference Result 176 states and 178 transitions. [2021-05-02 17:55:50,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 17:55:50,432 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.0) internal successors, (90), 44 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 91 [2021-05-02 17:55:50,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:55:50,432 INFO L225 Difference]: With dead ends: 176 [2021-05-02 17:55:50,432 INFO L226 Difference]: Without dead ends: 176 [2021-05-02 17:55:50,433 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 92 SyntacticMatches, 1 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 825 ImplicationChecksByTransitivity, 2208.5ms TimeCoverageRelationStatistics Valid=378, Invalid=7104, Unknown=0, NotChecked=0, Total=7482 [2021-05-02 17:55:50,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2021-05-02 17:55:50,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 175. [2021-05-02 17:55:50,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 170 states have (on average 1.0176470588235293) internal successors, (173), 170 states have internal predecessors, (173), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:50,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 177 transitions. [2021-05-02 17:55:50,450 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 177 transitions. Word has length 91 [2021-05-02 17:55:50,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:55:50,450 INFO L480 AbstractCegarLoop]: Abstraction has 175 states and 177 transitions. [2021-05-02 17:55:50,450 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.0) internal successors, (90), 44 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:55:50,450 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 177 transitions. [2021-05-02 17:55:50,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 17:55:50,450 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:55:50,450 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:55:50,651 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,81 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:55:50,651 INFO L428 AbstractCegarLoop]: === Iteration 85 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:55:50,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:55:50,651 INFO L82 PathProgramCache]: Analyzing trace with hash 2043720116, now seen corresponding path program 41 times [2021-05-02 17:55:50,651 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:55:50,652 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472563775] [2021-05-02 17:55:50,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:55:50,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:51,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:55:51,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:55:51,326 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:55:51,327 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:55:51,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472563775] [2021-05-02 17:55:51,327 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472563775] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:55:51,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [651736443] [2021-05-02 17:55:51,327 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 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:56:23,817 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2021-05-02 17:56:23,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:56:23,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 126 conjunts are in the unsatisfiable core [2021-05-02 17:56:23,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:56:24,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:56:24,793 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:56:24,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [651736443] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:24,794 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:56:24,794 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 46 [2021-05-02 17:56:24,794 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006803633] [2021-05-02 17:56:24,794 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 17:56:24,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:56:24,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 17:56:24,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 17:56:24,794 INFO L87 Difference]: Start difference. First operand 175 states and 177 transitions. Second operand has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:28,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:56:28,431 INFO L93 Difference]: Finished difference Result 178 states and 180 transitions. [2021-05-02 17:56:28,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 17:56:28,431 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-02 17:56:28,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:56:28,432 INFO L225 Difference]: With dead ends: 178 [2021-05-02 17:56:28,432 INFO L226 Difference]: Without dead ends: 178 [2021-05-02 17:56:28,432 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 53 SyntacticMatches, 42 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 946 ImplicationChecksByTransitivity, 3101.7ms TimeCoverageRelationStatistics Valid=341, Invalid=7315, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 17:56:28,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-05-02 17:56:28,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2021-05-02 17:56:28,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 172 states have (on average 1.0174418604651163) internal successors, (175), 172 states have internal predecessors, (175), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:28,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 179 transitions. [2021-05-02 17:56:28,434 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 179 transitions. Word has length 93 [2021-05-02 17:56:28,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:56:28,434 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 179 transitions. [2021-05-02 17:56:28,434 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:28,434 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 179 transitions. [2021-05-02 17:56:28,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 17:56:28,434 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:56:28,434 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:56:28,635 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,82 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:56:28,635 INFO L428 AbstractCegarLoop]: === Iteration 86 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:56:28,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:56:28,635 INFO L82 PathProgramCache]: Analyzing trace with hash 645070891, now seen corresponding path program 41 times [2021-05-02 17:56:28,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:56:28,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1924134596] [2021-05-02 17:56:28,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:56:28,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:29,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:56:29,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:29,648 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:56:29,648 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:56:29,648 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1924134596] [2021-05-02 17:56:29,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1924134596] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:29,648 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1831420880] [2021-05-02 17:56:29,648 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 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:56:53,102 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2021-05-02 17:56:53,103 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:56:53,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 120 conjunts are in the unsatisfiable core [2021-05-02 17:56:53,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:56:54,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:56:54,098 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:56:54,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1831420880] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:54,099 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:56:54,099 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44] total 46 [2021-05-02 17:56:54,099 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381395183] [2021-05-02 17:56:54,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 17:56:54,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:56:54,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 17:56:54,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=1939, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 17:56:54,099 INFO L87 Difference]: Start difference. First operand 177 states and 179 transitions. Second operand has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:57,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:56:57,409 INFO L93 Difference]: Finished difference Result 180 states and 182 transitions. [2021-05-02 17:56:57,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 17:56:57,409 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 93 [2021-05-02 17:56:57,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:56:57,410 INFO L225 Difference]: With dead ends: 180 [2021-05-02 17:56:57,410 INFO L226 Difference]: Without dead ends: 180 [2021-05-02 17:56:57,410 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 59 SyntacticMatches, 36 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 936 ImplicationChecksByTransitivity, 3482.5ms TimeCoverageRelationStatistics Valid=387, Invalid=7445, Unknown=0, NotChecked=0, Total=7832 [2021-05-02 17:56:57,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-05-02 17:56:57,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 179. [2021-05-02 17:56:57,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 174 states have (on average 1.0172413793103448) internal successors, (177), 174 states have internal predecessors, (177), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:57,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 181 transitions. [2021-05-02 17:56:57,412 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 181 transitions. Word has length 93 [2021-05-02 17:56:57,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:56:57,412 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 181 transitions. [2021-05-02 17:56:57,412 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 2.0) internal successors, (92), 45 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:56:57,412 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 181 transitions. [2021-05-02 17:56:57,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 17:56:57,413 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:56:57,413 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:56:57,613 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,83 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:56:57,613 INFO L428 AbstractCegarLoop]: === Iteration 87 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:56:57,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:56:57,614 INFO L82 PathProgramCache]: Analyzing trace with hash 2125418962, now seen corresponding path program 42 times [2021-05-02 17:56:57,614 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:56:57,614 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255228780] [2021-05-02 17:56:57,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:56:57,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:58,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:56:58,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:56:58,633 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:56:58,633 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:56:58,633 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255228780] [2021-05-02 17:56:58,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255228780] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:56:58,633 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893253568] [2021-05-02 17:56:58,633 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 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:04,029 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 43 check-sat command(s) [2021-05-02 17:57:04,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:57:04,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 96 conjunts are in the unsatisfiable core [2021-05-02 17:57:04,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:57:04,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:04,708 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:04,708 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893253568] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:04,708 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:57:04,708 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 17:57:04,708 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166992740] [2021-05-02 17:57:04,709 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 17:57:04,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:57:04,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 17:57:04,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 17:57:04,709 INFO L87 Difference]: Start difference. First operand 179 states and 181 transitions. Second operand has 47 states, 47 states have (on average 2.0) internal successors, (94), 46 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:08,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:57:08,848 INFO L93 Difference]: Finished difference Result 182 states and 184 transitions. [2021-05-02 17:57:08,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 17:57:08,849 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.0) internal successors, (94), 46 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-02 17:57:08,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:57:08,850 INFO L225 Difference]: With dead ends: 182 [2021-05-02 17:57:08,850 INFO L226 Difference]: Without dead ends: 182 [2021-05-02 17:57:08,850 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 87 SyntacticMatches, 10 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 925 ImplicationChecksByTransitivity, 3234.4ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 17:57:08,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-02 17:57:08,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2021-05-02 17:57:08,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0170454545454546) internal successors, (179), 176 states have internal predecessors, (179), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:08,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2021-05-02 17:57:08,852 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 95 [2021-05-02 17:57:08,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:57:08,852 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2021-05-02 17:57:08,852 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.0) internal successors, (94), 46 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:08,852 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2021-05-02 17:57:08,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-05-02 17:57:08,852 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:57:08,852 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:57:09,053 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94,84 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:09,053 INFO L428 AbstractCegarLoop]: === Iteration 88 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:57:09,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:57:09,053 INFO L82 PathProgramCache]: Analyzing trace with hash -1918060760, now seen corresponding path program 42 times [2021-05-02 17:57:09,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:57:09,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641232160] [2021-05-02 17:57:09,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:57:09,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:10,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:57:10,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:10,180 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:10,180 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:57:10,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641232160] [2021-05-02 17:57:10,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [641232160] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:10,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1181996228] [2021-05-02 17:57:10,180 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 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:16,256 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 43 check-sat command(s) [2021-05-02 17:57:16,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:57:16,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-02 17:57:16,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:57:17,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:17,746 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1181996228] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:17,746 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:57:17,746 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 68 [2021-05-02 17:57:17,746 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992451002] [2021-05-02 17:57:17,746 INFO L460 AbstractCegarLoop]: Interpolant automaton has 68 states [2021-05-02 17:57:17,746 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:57:17,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2021-05-02 17:57:17,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=4338, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 17:57:17,747 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 68 states, 68 states have (on average 2.0) internal successors, (136), 67 states have internal predecessors, (136), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:22,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:57:22,107 INFO L93 Difference]: Finished difference Result 184 states and 186 transitions. [2021-05-02 17:57:22,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 17:57:22,108 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 2.0) internal successors, (136), 67 states have internal predecessors, (136), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 95 [2021-05-02 17:57:22,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:57:22,109 INFO L225 Difference]: With dead ends: 184 [2021-05-02 17:57:22,109 INFO L226 Difference]: Without dead ends: 184 [2021-05-02 17:57:22,109 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2084 ImplicationChecksByTransitivity, 4408.8ms TimeCoverageRelationStatistics Valid=501, Invalid=11931, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 17:57:22,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-05-02 17:57:22,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2021-05-02 17:57:22,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 178 states have (on average 1.0168539325842696) internal successors, (181), 178 states have internal predecessors, (181), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:22,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 185 transitions. [2021-05-02 17:57:22,111 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 185 transitions. Word has length 95 [2021-05-02 17:57:22,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:57:22,111 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 185 transitions. [2021-05-02 17:57:22,111 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 68 states, 68 states have (on average 2.0) internal successors, (136), 67 states have internal predecessors, (136), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:22,111 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 185 transitions. [2021-05-02 17:57:22,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 17:57:22,111 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:57:22,112 INFO L523 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:57:22,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable95 [2021-05-02 17:57:22,312 INFO L428 AbstractCegarLoop]: === Iteration 89 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:57:22,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:57:22,312 INFO L82 PathProgramCache]: Analyzing trace with hash -966368656, now seen corresponding path program 43 times [2021-05-02 17:57:22,312 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:57:22,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [145755807] [2021-05-02 17:57:22,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:57:22,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:23,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:57:23,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:23,409 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:23,409 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:57:23,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [145755807] [2021-05-02 17:57:23,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [145755807] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:23,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [13333966] [2021-05-02 17:57:23,409 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 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:23,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:23,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 17:57:23,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:57:23,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:23,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:23,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [13333966] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:23,681 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:57:23,681 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46] total 48 [2021-05-02 17:57:23,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702930785] [2021-05-02 17:57:23,681 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 17:57:23,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:57:23,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 17:57:23,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 17:57:23,682 INFO L87 Difference]: Start difference. First operand 183 states and 185 transitions. Second operand has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:28,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:57:28,169 INFO L93 Difference]: Finished difference Result 186 states and 188 transitions. [2021-05-02 17:57:28,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 17:57:28,170 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-02 17:57:28,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:57:28,170 INFO L225 Difference]: With dead ends: 186 [2021-05-02 17:57:28,170 INFO L226 Difference]: Without dead ends: 186 [2021-05-02 17:57:28,171 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 3065.3ms TimeCoverageRelationStatistics Valid=357, Invalid=8015, Unknown=0, NotChecked=0, Total=8372 [2021-05-02 17:57:28,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2021-05-02 17:57:28,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 185. [2021-05-02 17:57:28,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 180 states have (on average 1.0166666666666666) internal successors, (183), 180 states have internal predecessors, (183), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:28,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 187 transitions. [2021-05-02 17:57:28,172 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 187 transitions. Word has length 97 [2021-05-02 17:57:28,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:57:28,173 INFO L480 AbstractCegarLoop]: Abstraction has 185 states and 187 transitions. [2021-05-02 17:57:28,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:28,173 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 187 transitions. [2021-05-02 17:57:28,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 17:57:28,173 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:57:28,173 INFO L523 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:57:28,373 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96,86 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:28,374 INFO L428 AbstractCegarLoop]: === Iteration 90 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:57:28,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:57:28,374 INFO L82 PathProgramCache]: Analyzing trace with hash 223650533, now seen corresponding path program 43 times [2021-05-02 17:57:28,374 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:57:28,374 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145229079] [2021-05-02 17:57:28,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:57:28,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:29,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:57:29,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:29,580 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:29,580 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:57:29,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145229079] [2021-05-02 17:57:29,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1145229079] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:29,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783986988] [2021-05-02 17:57:29,580 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 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:29,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:29,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 17:57:29,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:57:29,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:29,832 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:29,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783986988] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:29,833 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:57:29,833 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46] total 48 [2021-05-02 17:57:29,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289906878] [2021-05-02 17:57:29,833 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 17:57:29,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:57:29,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 17:57:29,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 17:57:29,833 INFO L87 Difference]: Start difference. First operand 185 states and 187 transitions. Second operand has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:33,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:57:33,795 INFO L93 Difference]: Finished difference Result 188 states and 190 transitions. [2021-05-02 17:57:33,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 17:57:33,795 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 97 [2021-05-02 17:57:33,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:57:33,796 INFO L225 Difference]: With dead ends: 188 [2021-05-02 17:57:33,796 INFO L226 Difference]: Without dead ends: 188 [2021-05-02 17:57:33,796 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 951 ImplicationChecksByTransitivity, 3214.4ms TimeCoverageRelationStatistics Valid=405, Invalid=8151, Unknown=0, NotChecked=0, Total=8556 [2021-05-02 17:57:33,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 188 states. [2021-05-02 17:57:33,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 188 to 187. [2021-05-02 17:57:33,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 182 states have (on average 1.0164835164835164) internal successors, (185), 182 states have internal predecessors, (185), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:33,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 189 transitions. [2021-05-02 17:57:33,798 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 189 transitions. Word has length 97 [2021-05-02 17:57:33,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:57:33,798 INFO L480 AbstractCegarLoop]: Abstraction has 187 states and 189 transitions. [2021-05-02 17:57:33,798 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 2.0) internal successors, (96), 47 states have internal predecessors, (96), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:33,798 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 189 transitions. [2021-05-02 17:57:33,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 17:57:33,799 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:57:33,799 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:57:33,999 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable97 [2021-05-02 17:57:33,999 INFO L428 AbstractCegarLoop]: === Iteration 91 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:57:34,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:57:34,000 INFO L82 PathProgramCache]: Analyzing trace with hash -56900722, now seen corresponding path program 44 times [2021-05-02 17:57:34,000 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:57:34,000 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616293120] [2021-05-02 17:57:34,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:57:34,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:35,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:57:35,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:35,144 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:35,144 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:57:35,144 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616293120] [2021-05-02 17:57:35,144 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [616293120] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:35,144 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [827250498] [2021-05-02 17:57:35,144 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 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:35,195 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:57:35,195 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:57:35,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 17:57:35,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:57:35,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:35,387 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:35,387 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [827250498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:35,387 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:57:35,388 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 17:57:35,388 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971684012] [2021-05-02 17:57:35,388 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 17:57:35,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:57:35,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 17:57:35,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 17:57:35,388 INFO L87 Difference]: Start difference. First operand 187 states and 189 transitions. Second operand has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:39,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:57:39,479 INFO L93 Difference]: Finished difference Result 190 states and 192 transitions. [2021-05-02 17:57:39,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 17:57:39,480 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 99 [2021-05-02 17:57:39,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:57:39,480 INFO L225 Difference]: With dead ends: 190 [2021-05-02 17:57:39,480 INFO L226 Difference]: Without dead ends: 190 [2021-05-02 17:57:39,481 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 2958.6ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 17:57:39,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2021-05-02 17:57:39,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 189. [2021-05-02 17:57:39,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 184 states have (on average 1.016304347826087) internal successors, (187), 184 states have internal predecessors, (187), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:39,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 191 transitions. [2021-05-02 17:57:39,486 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 191 transitions. Word has length 99 [2021-05-02 17:57:39,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:57:39,486 INFO L480 AbstractCegarLoop]: Abstraction has 189 states and 191 transitions. [2021-05-02 17:57:39,496 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:39,497 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 191 transitions. [2021-05-02 17:57:39,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 17:57:39,497 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:57:39,497 INFO L523 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:57:39,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable98 [2021-05-02 17:57:39,712 INFO L428 AbstractCegarLoop]: === Iteration 92 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:57:39,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:57:39,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1118868322, now seen corresponding path program 44 times [2021-05-02 17:57:39,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:57:39,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313113048] [2021-05-02 17:57:39,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:57:39,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:41,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:57:41,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:41,030 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:41,030 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:57:41,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313113048] [2021-05-02 17:57:41,030 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313113048] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:41,030 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1835887397] [2021-05-02 17:57:41,030 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 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:41,101 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:57:41,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:57:41,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 17:57:41,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:57:41,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:41,395 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:41,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1835887397] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:41,396 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:57:41,396 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 17:57:41,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724376688] [2021-05-02 17:57:41,396 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 17:57:41,396 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:57:41,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 17:57:41,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 17:57:41,397 INFO L87 Difference]: Start difference. First operand 189 states and 191 transitions. Second operand has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:44,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:57:44,643 INFO L93 Difference]: Finished difference Result 192 states and 194 transitions. [2021-05-02 17:57:44,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 17:57:44,643 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 99 [2021-05-02 17:57:44,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:57:44,644 INFO L225 Difference]: With dead ends: 192 [2021-05-02 17:57:44,644 INFO L226 Difference]: Without dead ends: 192 [2021-05-02 17:57:44,645 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 995 ImplicationChecksByTransitivity, 2929.2ms TimeCoverageRelationStatistics Valid=414, Invalid=8516, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 17:57:44,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2021-05-02 17:57:44,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 191. [2021-05-02 17:57:44,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 186 states have (on average 1.0161290322580645) internal successors, (189), 186 states have internal predecessors, (189), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:44,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 193 transitions. [2021-05-02 17:57:44,646 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 193 transitions. Word has length 99 [2021-05-02 17:57:44,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:57:44,646 INFO L480 AbstractCegarLoop]: Abstraction has 191 states and 193 transitions. [2021-05-02 17:57:44,646 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0) internal successors, (98), 48 states have internal predecessors, (98), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:44,647 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 193 transitions. [2021-05-02 17:57:44,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 17:57:44,647 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:57:44,653 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:57:44,869 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable99,89 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:44,869 INFO L428 AbstractCegarLoop]: === Iteration 93 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:57:44,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:57:44,869 INFO L82 PathProgramCache]: Analyzing trace with hash 2063422764, now seen corresponding path program 45 times [2021-05-02 17:57:44,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:57:44,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427434252] [2021-05-02 17:57:44,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:57:44,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:45,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:57:45,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:45,887 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:45,887 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:57:45,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427434252] [2021-05-02 17:57:45,887 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427434252] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:45,887 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [77649290] [2021-05-02 17:57:45,887 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 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:46,963 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2021-05-02 17:57:46,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:57:46,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-02 17:57:46,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:57:47,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:47,286 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:47,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [77649290] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:47,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:57:47,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 17:57:47,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225100488] [2021-05-02 17:57:47,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 17:57:47,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:57:47,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 17:57:47,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 17:57:47,287 INFO L87 Difference]: Start difference. First operand 191 states and 193 transitions. Second operand has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:51,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:57:51,437 INFO L93 Difference]: Finished difference Result 194 states and 196 transitions. [2021-05-02 17:57:51,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 17:57:51,438 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-02 17:57:51,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:57:51,439 INFO L225 Difference]: With dead ends: 194 [2021-05-02 17:57:51,439 INFO L226 Difference]: Without dead ends: 194 [2021-05-02 17:57:51,439 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1041 ImplicationChecksByTransitivity, 2916.3ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 17:57:51,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-02 17:57:51,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2021-05-02 17:57:51,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:51,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2021-05-02 17:57:51,441 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 101 [2021-05-02 17:57:51,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:57:51,441 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2021-05-02 17:57:51,441 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:57:51,441 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2021-05-02 17:57:51,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 17:57:51,441 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:57:51,441 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:57:51,642 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100,90 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:51,642 INFO L428 AbstractCegarLoop]: === Iteration 94 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:57:51,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:57:51,642 INFO L82 PathProgramCache]: Analyzing trace with hash -1865262945, now seen corresponding path program 45 times [2021-05-02 17:57:51,642 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:57:51,642 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1098078824] [2021-05-02 17:57:51,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:57:51,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:52,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:57:52,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:57:52,844 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:52,844 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:57:52,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1098078824] [2021-05-02 17:57:52,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1098078824] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:52,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [589471923] [2021-05-02 17:57:52,844 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 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:57:55,648 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2021-05-02 17:57:55,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:57:55,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 17:57:55,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:57:56,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:57:56,257 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:57:56,257 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [589471923] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:57:56,257 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:57:56,257 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 17:57:56,257 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69515874] [2021-05-02 17:57:56,257 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 17:57:56,257 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:57:56,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 17:57:56,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 17:57:56,258 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:58:00,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:58:00,171 INFO L93 Difference]: Finished difference Result 196 states and 198 transitions. [2021-05-02 17:58:00,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 17:58:00,171 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-02 17:58:00,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:58:00,172 INFO L225 Difference]: With dead ends: 196 [2021-05-02 17:58:00,172 INFO L226 Difference]: Without dead ends: 196 [2021-05-02 17:58:00,172 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 92 SyntacticMatches, 11 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 3536.6ms TimeCoverageRelationStatistics Valid=423, Invalid=8889, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 17:58:00,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-05-02 17:58:00,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 195. [2021-05-02 17:58:00,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 190 states have (on average 1.0157894736842106) internal successors, (193), 190 states have internal predecessors, (193), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:58:00,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 197 transitions. [2021-05-02 17:58:00,174 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 197 transitions. Word has length 101 [2021-05-02 17:58:00,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:58:00,174 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 197 transitions. [2021-05-02 17:58:00,174 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.0) internal successors, (100), 49 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:58:00,174 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 197 transitions. [2021-05-02 17:58:00,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-02 17:58:00,175 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:58:00,175 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:58:00,375 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable101 [2021-05-02 17:58:00,375 INFO L428 AbstractCegarLoop]: === Iteration 95 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:58:00,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:58:00,376 INFO L82 PathProgramCache]: Analyzing trace with hash -415172790, now seen corresponding path program 46 times [2021-05-02 17:58:00,376 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:58:00,376 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [787998242] [2021-05-02 17:58:00,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:58:00,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:58:01,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:58:01,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:58:01,600 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:58:01,600 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:58:01,600 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [787998242] [2021-05-02 17:58:01,600 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [787998242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:58:01,600 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1959285446] [2021-05-02 17:58:01,600 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 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:58:01,644 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:58:01,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:58:01,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 17:58:01,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:58:04,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:58:04,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:58:04,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:58:04,808 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:58:04,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1959285446] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:58:04,808 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:58:04,808 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 51] total 98 [2021-05-02 17:58:04,808 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140742088] [2021-05-02 17:58:04,808 INFO L460 AbstractCegarLoop]: Interpolant automaton has 98 states [2021-05-02 17:58:04,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:58:04,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-05-02 17:58:04,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=9176, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 17:58:04,809 INFO L87 Difference]: Start difference. First operand 195 states and 197 transitions. Second operand has 98 states, 98 states have (on average 1.9795918367346939) internal successors, (194), 96 states have internal predecessors, (194), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:58:11,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:58:11,996 INFO L93 Difference]: Finished difference Result 198 states and 200 transitions. [2021-05-02 17:58:11,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2021-05-02 17:58:11,996 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 1.9795918367346939) internal successors, (194), 96 states have internal predecessors, (194), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2021-05-02 17:58:11,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:58:11,997 INFO L225 Difference]: With dead ends: 198 [2021-05-02 17:58:11,997 INFO L226 Difference]: Without dead ends: 198 [2021-05-02 17:58:11,998 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6696 ImplicationChecksByTransitivity, 7408.0ms TimeCoverageRelationStatistics Valid=815, Invalid=27241, Unknown=0, NotChecked=0, Total=28056 [2021-05-02 17:58:11,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-05-02 17:58:11,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 197. [2021-05-02 17:58:11,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 197 states, 192 states have (on average 1.015625) internal successors, (195), 192 states have internal predecessors, (195), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:58:11,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 199 transitions. [2021-05-02 17:58:12,000 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 199 transitions. Word has length 103 [2021-05-02 17:58:12,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:58:12,000 INFO L480 AbstractCegarLoop]: Abstraction has 197 states and 199 transitions. [2021-05-02 17:58:12,000 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 98 states, 98 states have (on average 1.9795918367346939) internal successors, (194), 96 states have internal predecessors, (194), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:58:12,000 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 199 transitions. [2021-05-02 17:58:12,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-05-02 17:58:12,001 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:58:12,001 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:58:12,208 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable102 [2021-05-02 17:58:12,209 INFO L428 AbstractCegarLoop]: === Iteration 96 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:58:12,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:58:12,209 INFO L82 PathProgramCache]: Analyzing trace with hash -577256804, now seen corresponding path program 46 times [2021-05-02 17:58:12,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:58:12,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1906425726] [2021-05-02 17:58:12,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:58:12,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:58:13,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:58:13,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:58:13,489 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:58:13,489 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:58:13,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1906425726] [2021-05-02 17:58:13,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1906425726] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:58:13,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1402267520] [2021-05-02 17:58:13,489 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 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:58:13,557 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:58:13,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:58:13,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 95 conjunts are in the unsatisfiable core [2021-05-02 17:58:13,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:58:13,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:58:13,772 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:58:13,772 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1402267520] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:58:13,772 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:58:13,773 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49] total 51 [2021-05-02 17:58:13,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172485450] [2021-05-02 17:58:13,773 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 17:58:13,773 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:58:13,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 17:58:13,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 17:58:13,773 INFO L87 Difference]: Start difference. First operand 197 states and 199 transitions. Second operand has 51 states, 51 states have (on average 2.0) internal successors, (102), 50 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:58:17,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:58:17,958 INFO L93 Difference]: Finished difference Result 200 states and 202 transitions. [2021-05-02 17:58:17,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 17:58:17,959 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0) internal successors, (102), 50 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 103 [2021-05-02 17:58:17,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:58:17,960 INFO L225 Difference]: With dead ends: 200 [2021-05-02 17:58:17,960 INFO L226 Difference]: Without dead ends: 200 [2021-05-02 17:58:17,960 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1086 ImplicationChecksByTransitivity, 3318.8ms TimeCoverageRelationStatistics Valid=432, Invalid=9270, Unknown=0, NotChecked=0, Total=9702 [2021-05-02 17:58:17,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-02 17:58:17,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 199. [2021-05-02 17:58:17,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 194 states have (on average 1.0154639175257731) internal successors, (197), 194 states have internal predecessors, (197), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:58:17,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 201 transitions. [2021-05-02 17:58:17,962 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 201 transitions. Word has length 103 [2021-05-02 17:58:17,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:58:17,962 INFO L480 AbstractCegarLoop]: Abstraction has 199 states and 201 transitions. [2021-05-02 17:58:17,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.0) internal successors, (102), 50 states have internal predecessors, (102), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:58:17,962 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 201 transitions. [2021-05-02 17:58:17,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 17:58:17,962 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:58:17,962 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:58:18,163 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104,93 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:58:18,163 INFO L428 AbstractCegarLoop]: === Iteration 97 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:58:18,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:58:18,163 INFO L82 PathProgramCache]: Analyzing trace with hash 1361349096, now seen corresponding path program 47 times [2021-05-02 17:58:18,163 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:58:18,163 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063664630] [2021-05-02 17:58:18,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:58:18,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:58:19,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:58:19,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:58:19,494 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:58:19,495 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:58:19,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063664630] [2021-05-02 17:58:19,495 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063664630] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:58:19,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1286099946] [2021-05-02 17:58:19,495 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 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:59:06,399 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 48 check-sat command(s) [2021-05-02 17:59:06,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:59:06,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 140 conjunts are in the unsatisfiable core [2021-05-02 17:59:06,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:59:07,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:59:07,718 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:59:07,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1286099946] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:59:07,718 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:59:07,718 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 17:59:07,718 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818178826] [2021-05-02 17:59:07,718 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 17:59:07,719 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:59:07,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 17:59:07,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 17:59:07,719 INFO L87 Difference]: Start difference. First operand 199 states and 201 transitions. Second operand has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:59:12,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:59:12,415 INFO L93 Difference]: Finished difference Result 202 states and 204 transitions. [2021-05-02 17:59:12,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 17:59:12,416 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2021-05-02 17:59:12,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:59:12,416 INFO L225 Difference]: With dead ends: 202 [2021-05-02 17:59:12,416 INFO L226 Difference]: Without dead ends: 202 [2021-05-02 17:59:12,417 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 63 SyntacticMatches, 44 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1218 ImplicationChecksByTransitivity, 4400.8ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 17:59:12,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-05-02 17:59:12,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 201. [2021-05-02 17:59:12,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 196 states have (on average 1.0153061224489797) internal successors, (199), 196 states have internal predecessors, (199), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:59:12,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2021-05-02 17:59:12,418 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 105 [2021-05-02 17:59:12,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:59:12,419 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2021-05-02 17:59:12,419 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:59:12,419 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2021-05-02 17:59:12,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 17:59:12,419 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:59:12,419 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:59:12,619 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable105 [2021-05-02 17:59:12,620 INFO L428 AbstractCegarLoop]: === Iteration 98 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:59:12,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:59:12,620 INFO L82 PathProgramCache]: Analyzing trace with hash 246063449, now seen corresponding path program 47 times [2021-05-02 17:59:12,620 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:59:12,620 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715905885] [2021-05-02 17:59:12,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:59:12,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:59:13,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:59:13,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:59:13,912 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:59:13,912 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:59:13,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715905885] [2021-05-02 17:59:13,912 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715905885] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:59:13,912 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60519569] [2021-05-02 17:59:13,912 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 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:59:48,028 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 48 check-sat command(s) [2021-05-02 17:59:48,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:59:48,041 WARN L261 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 141 conjunts are in the unsatisfiable core [2021-05-02 17:59:48,042 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:59:49,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:59:49,361 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:59:49,361 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60519569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:59:49,361 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 17:59:49,361 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 17:59:49,361 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83267182] [2021-05-02 17:59:49,362 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 17:59:49,362 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:59:49,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 17:59:49,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 17:59:49,362 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:59:52,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:59:52,745 INFO L93 Difference]: Finished difference Result 204 states and 206 transitions. [2021-05-02 17:59:52,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 17:59:52,745 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 105 [2021-05-02 17:59:52,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:59:52,746 INFO L225 Difference]: With dead ends: 204 [2021-05-02 17:59:52,746 INFO L226 Difference]: Without dead ends: 204 [2021-05-02 17:59:52,746 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 206 GetRequests, 62 SyntacticMatches, 45 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1221 ImplicationChecksByTransitivity, 4073.3ms TimeCoverageRelationStatistics Valid=441, Invalid=9659, Unknown=0, NotChecked=0, Total=10100 [2021-05-02 17:59:52,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-05-02 17:59:52,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 203. [2021-05-02 17:59:52,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 198 states have (on average 1.0151515151515151) internal successors, (201), 198 states have internal predecessors, (201), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:59:52,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 205 transitions. [2021-05-02 17:59:52,748 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 205 transitions. Word has length 105 [2021-05-02 17:59:52,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:59:52,748 INFO L480 AbstractCegarLoop]: Abstraction has 203 states and 205 transitions. [2021-05-02 17:59:52,748 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 2.0) internal successors, (104), 51 states have internal predecessors, (104), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 17:59:52,748 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 205 transitions. [2021-05-02 17:59:52,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 17:59:52,749 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:59:52,749 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:59:52,949 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106,95 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:59:52,949 INFO L428 AbstractCegarLoop]: === Iteration 99 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:59:52,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:59:52,950 INFO L82 PathProgramCache]: Analyzing trace with hash -798102266, now seen corresponding path program 48 times [2021-05-02 17:59:52,950 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:59:52,950 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874210137] [2021-05-02 17:59:52,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:59:52,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:59:54,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:59:54,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:59:54,363 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:59:54,363 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:59:54,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874210137] [2021-05-02 17:59:54,363 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874210137] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:59:54,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [220020212] [2021-05-02 17:59:54,364 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 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:00:04,960 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2021-05-02 18:00:04,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:00:04,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 125 conjunts are in the unsatisfiable core [2021-05-02 18:00:04,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:00:06,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:00:06,060 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:00:06,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [220020212] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:06,061 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:00:06,061 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 18:00:06,061 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589301336] [2021-05-02 18:00:06,061 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 18:00:06,061 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:00:06,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 18:00:06,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 18:00:06,061 INFO L87 Difference]: Start difference. First operand 203 states and 205 transitions. Second operand has 53 states, 53 states have (on average 2.0) internal successors, (106), 52 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:11,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:00:11,191 INFO L93 Difference]: Finished difference Result 206 states and 208 transitions. [2021-05-02 18:00:11,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 18:00:11,192 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0) internal successors, (106), 52 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-02 18:00:11,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:00:11,192 INFO L225 Difference]: With dead ends: 206 [2021-05-02 18:00:11,192 INFO L226 Difference]: Without dead ends: 206 [2021-05-02 18:00:11,193 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 82 SyntacticMatches, 27 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1232 ImplicationChecksByTransitivity, 4380.8ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 18:00:11,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-05-02 18:00:11,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 205. [2021-05-02 18:00:11,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:11,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2021-05-02 18:00:11,194 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 107 [2021-05-02 18:00:11,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:00:11,195 INFO L480 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2021-05-02 18:00:11,195 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0) internal successors, (106), 52 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:11,195 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2021-05-02 18:00:11,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 18:00:11,195 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:00:11,195 INFO L523 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:00:11,400 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable107 [2021-05-02 18:00:11,400 INFO L428 AbstractCegarLoop]: === Iteration 100 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:00:11,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:00:11,401 INFO L82 PathProgramCache]: Analyzing trace with hash 1182844118, now seen corresponding path program 48 times [2021-05-02 18:00:11,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:00:11,401 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396752162] [2021-05-02 18:00:11,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:00:11,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:12,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:00:12,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:12,799 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:00:12,800 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:00:12,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396752162] [2021-05-02 18:00:12,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1396752162] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:12,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194112739] [2021-05-02 18:00:12,800 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 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:00:20,123 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2021-05-02 18:00:20,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:00:20,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 105 conjunts are in the unsatisfiable core [2021-05-02 18:00:20,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:00:20,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:00:20,644 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:00:20,645 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [194112739] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:20,645 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:00:20,645 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 18:00:20,645 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694129769] [2021-05-02 18:00:20,645 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 18:00:20,645 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:00:20,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 18:00:20,646 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 18:00:20,646 INFO L87 Difference]: Start difference. First operand 205 states and 207 transitions. Second operand has 53 states, 53 states have (on average 2.0) internal successors, (106), 52 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:26,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:00:26,347 INFO L93 Difference]: Finished difference Result 208 states and 210 transitions. [2021-05-02 18:00:26,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 18:00:26,348 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0) internal successors, (106), 52 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-02 18:00:26,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:00:26,348 INFO L225 Difference]: With dead ends: 208 [2021-05-02 18:00:26,348 INFO L226 Difference]: Without dead ends: 208 [2021-05-02 18:00:26,349 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 102 SyntacticMatches, 7 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1193 ImplicationChecksByTransitivity, 4420.7ms TimeCoverageRelationStatistics Valid=450, Invalid=10056, Unknown=0, NotChecked=0, Total=10506 [2021-05-02 18:00:26,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-05-02 18:00:26,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 207. [2021-05-02 18:00:26,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 202 states have (on average 1.0148514851485149) internal successors, (205), 202 states have internal predecessors, (205), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:26,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 209 transitions. [2021-05-02 18:00:26,351 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 209 transitions. Word has length 107 [2021-05-02 18:00:26,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:00:26,352 INFO L480 AbstractCegarLoop]: Abstraction has 207 states and 209 transitions. [2021-05-02 18:00:26,352 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0) internal successors, (106), 52 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:26,352 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 209 transitions. [2021-05-02 18:00:26,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-02 18:00:26,352 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:00:26,352 INFO L523 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:00:26,558 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable108 [2021-05-02 18:00:26,558 INFO L428 AbstractCegarLoop]: === Iteration 101 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:00:26,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:00:26,559 INFO L82 PathProgramCache]: Analyzing trace with hash -1561657180, now seen corresponding path program 49 times [2021-05-02 18:00:26,559 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:00:26,559 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834385383] [2021-05-02 18:00:26,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:00:26,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:28,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:00:28,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:28,063 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:00:28,064 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:00:28,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834385383] [2021-05-02 18:00:28,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834385383] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:28,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [639688986] [2021-05-02 18:00:28,064 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 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:00:28,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:28,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 18:00:28,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:00:28,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:00:28,468 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:00:28,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [639688986] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:28,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:00:28,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52] total 54 [2021-05-02 18:00:28,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434237288] [2021-05-02 18:00:28,469 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 18:00:28,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:00:28,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 18:00:28,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2707, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:00:28,471 INFO L87 Difference]: Start difference. First operand 207 states and 209 transitions. Second operand has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:34,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:00:34,733 INFO L93 Difference]: Finished difference Result 210 states and 212 transitions. [2021-05-02 18:00:34,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 18:00:34,734 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-05-02 18:00:34,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:00:34,735 INFO L225 Difference]: With dead ends: 210 [2021-05-02 18:00:34,735 INFO L226 Difference]: Without dead ends: 210 [2021-05-02 18:00:34,735 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 110 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1229 ImplicationChecksByTransitivity, 4179.8ms TimeCoverageRelationStatistics Valid=405, Invalid=10307, Unknown=0, NotChecked=0, Total=10712 [2021-05-02 18:00:34,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2021-05-02 18:00:34,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 209. [2021-05-02 18:00:34,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 209 states, 204 states have (on average 1.0147058823529411) internal successors, (207), 204 states have internal predecessors, (207), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:34,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 209 states to 209 states and 211 transitions. [2021-05-02 18:00:34,737 INFO L78 Accepts]: Start accepts. Automaton has 209 states and 211 transitions. Word has length 109 [2021-05-02 18:00:34,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:00:34,737 INFO L480 AbstractCegarLoop]: Abstraction has 209 states and 211 transitions. [2021-05-02 18:00:34,737 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:34,737 INFO L276 IsEmpty]: Start isEmpty. Operand 209 states and 211 transitions. [2021-05-02 18:00:34,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-02 18:00:34,738 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:00:34,738 INFO L523 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:00:34,938 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109,98 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:00:34,939 INFO L428 AbstractCegarLoop]: === Iteration 102 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:00:34,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:00:34,939 INFO L82 PathProgramCache]: Analyzing trace with hash -514065133, now seen corresponding path program 49 times [2021-05-02 18:00:34,939 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:00:34,939 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [586873418] [2021-05-02 18:00:34,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:00:34,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:36,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:00:36,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:36,929 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:00:36,929 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:00:36,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [586873418] [2021-05-02 18:00:36,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [586873418] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:36,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721750123] [2021-05-02 18:00:36,930 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 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:00:36,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:36,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 18:00:36,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:00:37,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:00:37,330 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:00:37,330 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721750123] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:37,330 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:00:37,330 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52] total 54 [2021-05-02 18:00:37,330 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185646886] [2021-05-02 18:00:37,331 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 18:00:37,331 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:00:37,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 18:00:37,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2707, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 18:00:37,331 INFO L87 Difference]: Start difference. First operand 209 states and 211 transitions. Second operand has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:42,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:00:42,807 INFO L93 Difference]: Finished difference Result 212 states and 214 transitions. [2021-05-02 18:00:42,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 18:00:42,808 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-05-02 18:00:42,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:00:42,809 INFO L225 Difference]: With dead ends: 212 [2021-05-02 18:00:42,809 INFO L226 Difference]: Without dead ends: 212 [2021-05-02 18:00:42,809 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 110 SyntacticMatches, 1 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1230 ImplicationChecksByTransitivity, 4676.2ms TimeCoverageRelationStatistics Valid=459, Invalid=10461, Unknown=0, NotChecked=0, Total=10920 [2021-05-02 18:00:42,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2021-05-02 18:00:42,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 211. [2021-05-02 18:00:42,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 206 states have (on average 1.0145631067961165) internal successors, (209), 206 states have internal predecessors, (209), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:42,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 213 transitions. [2021-05-02 18:00:42,811 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 213 transitions. Word has length 109 [2021-05-02 18:00:42,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:00:42,811 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 213 transitions. [2021-05-02 18:00:42,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.0) internal successors, (108), 53 states have internal predecessors, (108), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:42,811 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 213 transitions. [2021-05-02 18:00:42,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-02 18:00:42,811 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:00:42,812 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:00:43,012 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110,99 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:00:43,012 INFO L428 AbstractCegarLoop]: === Iteration 103 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:00:43,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:00:43,013 INFO L82 PathProgramCache]: Analyzing trace with hash -898521918, now seen corresponding path program 50 times [2021-05-02 18:00:43,013 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:00:43,013 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747154213] [2021-05-02 18:00:43,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:00:43,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:44,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 18:00:44,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 18:00:44,573 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:00:44,573 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 18:00:44,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747154213] [2021-05-02 18:00:44,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747154213] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:44,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1085843293] [2021-05-02 18:00:44,573 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 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 18:00:44,641 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 18:00:44,642 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 18:00:44,643 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 18:00:44,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 18:00:44,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 18:00:44,898 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 18:00:44,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1085843293] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 18:00:44,898 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 18:00:44,898 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53] total 55 [2021-05-02 18:00:44,898 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340386367] [2021-05-02 18:00:44,900 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 18:00:44,900 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 18:00:44,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 18:00:44,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2812, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 18:00:44,900 INFO L87 Difference]: Start difference. First operand 211 states and 213 transitions. Second operand has 55 states, 55 states have (on average 2.0) internal successors, (110), 54 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:50,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 18:00:50,611 INFO L93 Difference]: Finished difference Result 214 states and 216 transitions. [2021-05-02 18:00:50,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-05-02 18:00:50,612 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.0) internal successors, (110), 54 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 111 [2021-05-02 18:00:50,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 18:00:50,612 INFO L225 Difference]: With dead ends: 214 [2021-05-02 18:00:50,612 INFO L226 Difference]: Without dead ends: 214 [2021-05-02 18:00:50,613 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 112 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 3948.2ms TimeCoverageRelationStatistics Valid=413, Invalid=10717, Unknown=0, NotChecked=0, Total=11130 [2021-05-02 18:00:50,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-05-02 18:00:50,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 213. [2021-05-02 18:00:50,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 208 states have (on average 1.0144230769230769) internal successors, (211), 208 states have internal predecessors, (211), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:50,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2021-05-02 18:00:50,615 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 111 [2021-05-02 18:00:50,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 18:00:50,615 INFO L480 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2021-05-02 18:00:50,615 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 2.0) internal successors, (110), 54 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 18:00:50,615 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2021-05-02 18:00:50,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-02 18:00:50,615 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 18:00:50,615 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 18:00:50,816 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable111 [2021-05-02 18:00:50,816 INFO L428 AbstractCegarLoop]: === Iteration 104 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 18:00:50,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 18:00:50,816 INFO L82 PathProgramCache]: Analyzing trace with hash 843717136, now seen corresponding path program 50 times [2021-05-02 18:00:50,816 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 18:00:50,816 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038959614] [2021-05-02 18:00:50,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 18:00:50,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 18:00:50,875 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 18:00:50,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 18:00:50,933 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 18:00:50,985 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 18:00:50,986 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 18:00:50,986 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable112 [2021-05-02 18:00:51,081 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 06:00:51 BasicIcfg [2021-05-02 18:00:51,081 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 18:00:51,081 INFO L168 Benchmark]: Toolchain (without parser) took 526533.30 ms. Allocated memory was 238.0 MB in the beginning and 448.8 MB in the end (delta: 210.8 MB). Free memory was 203.4 MB in the beginning and 183.1 MB in the end (delta: 20.2 MB). Peak memory consumption was 231.9 MB. Max. memory is 8.0 GB. [2021-05-02 18:00:51,082 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 238.0 MB. Free memory is still 220.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 18:00:51,082 INFO L168 Benchmark]: CACSL2BoogieTranslator took 122.85 ms. Allocated memory is still 238.0 MB. Free memory was 203.2 MB in the beginning and 193.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 18:00:51,082 INFO L168 Benchmark]: Boogie Preprocessor took 48.88 ms. Allocated memory is still 238.0 MB. Free memory was 193.8 MB in the beginning and 221.9 MB in the end (delta: -28.1 MB). Peak memory consumption was 3.3 MB. Max. memory is 8.0 GB. [2021-05-02 18:00:51,082 INFO L168 Benchmark]: RCFGBuilder took 257.01 ms. Allocated memory is still 238.0 MB. Free memory was 221.9 MB in the beginning and 208.4 MB in the end (delta: 13.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2021-05-02 18:00:51,082 INFO L168 Benchmark]: IcfgTransformer took 29.48 ms. Allocated memory is still 238.0 MB. Free memory was 208.4 MB in the beginning and 206.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 18:00:51,085 INFO L168 Benchmark]: TraceAbstraction took 526070.91 ms. Allocated memory was 238.0 MB in the beginning and 448.8 MB in the end (delta: 210.8 MB). Free memory was 206.3 MB in the beginning and 183.1 MB in the end (delta: 23.1 MB). Peak memory consumption was 235.0 MB. Max. memory is 8.0 GB. [2021-05-02 18:00:51,085 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 238.0 MB. Free memory is still 220.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 122.85 ms. Allocated memory is still 238.0 MB. Free memory was 203.2 MB in the beginning and 193.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 48.88 ms. Allocated memory is still 238.0 MB. Free memory was 193.8 MB in the beginning and 221.9 MB in the end (delta: -28.1 MB). Peak memory consumption was 3.3 MB. Max. memory is 8.0 GB. * RCFGBuilder took 257.01 ms. Allocated memory is still 238.0 MB. Free memory was 221.9 MB in the beginning and 208.4 MB in the end (delta: 13.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * IcfgTransformer took 29.48 ms. Allocated memory is still 238.0 MB. Free memory was 208.4 MB in the beginning and 206.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 526070.91 ms. Allocated memory was 238.0 MB in the beginning and 448.8 MB in the end (delta: 210.8 MB). Free memory was 206.3 MB in the beginning and 183.1 MB in the end (delta: 23.1 MB). Peak memory consumption was 235.0 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L14] unsigned int x = 0; [L15] unsigned int y = __VERIFIER_nondet_uint(); [L17] COND TRUE x < 99 VAL [x=0, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=2, y=4294967295] [L17] COND TRUE x < 99 VAL [x=2, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=4, y=4294967295] [L17] COND TRUE x < 99 VAL [x=4, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=6, y=4294967295] [L17] COND TRUE x < 99 VAL [x=6, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=8, y=4294967295] [L17] COND TRUE x < 99 VAL [x=8, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=10, y=4294967295] [L17] COND TRUE x < 99 VAL [x=10, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=12, y=4294967295] [L17] COND TRUE x < 99 VAL [x=12, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=14, y=4294967295] [L17] COND TRUE x < 99 VAL [x=14, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=16, y=4294967295] [L17] COND TRUE x < 99 VAL [x=16, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=18, y=4294967295] [L17] COND TRUE x < 99 VAL [x=18, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=20, y=4294967295] [L17] COND TRUE x < 99 VAL [x=20, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=22, y=4294967295] [L17] COND TRUE x < 99 VAL [x=22, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=24, y=4294967295] [L17] COND TRUE x < 99 VAL [x=24, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=26, y=4294967295] [L17] COND TRUE x < 99 VAL [x=26, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=28, y=4294967295] [L17] COND TRUE x < 99 VAL [x=28, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=30, y=4294967295] [L17] COND TRUE x < 99 VAL [x=30, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=32, y=4294967295] [L17] COND TRUE x < 99 VAL [x=32, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=34, y=4294967295] [L17] COND TRUE x < 99 VAL [x=34, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=36, y=4294967295] [L17] COND TRUE x < 99 VAL [x=36, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=38, y=4294967295] [L17] COND TRUE x < 99 VAL [x=38, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=40, y=4294967295] [L17] COND TRUE x < 99 VAL [x=40, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=42, y=4294967295] [L17] COND TRUE x < 99 VAL [x=42, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=44, y=4294967295] [L17] COND TRUE x < 99 VAL [x=44, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=46, y=4294967295] [L17] COND TRUE x < 99 VAL [x=46, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=48, y=4294967295] [L17] COND TRUE x < 99 VAL [x=48, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=50, y=4294967295] [L17] COND TRUE x < 99 VAL [x=50, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=52, y=4294967295] [L17] COND TRUE x < 99 VAL [x=52, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=54, y=4294967295] [L17] COND TRUE x < 99 VAL [x=54, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=56, y=4294967295] [L17] COND TRUE x < 99 VAL [x=56, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=58, y=4294967295] [L17] COND TRUE x < 99 VAL [x=58, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=60, y=4294967295] [L17] COND TRUE x < 99 VAL [x=60, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=62, y=4294967295] [L17] COND TRUE x < 99 VAL [x=62, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=64, y=4294967295] [L17] COND TRUE x < 99 VAL [x=64, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=66, y=4294967295] [L17] COND TRUE x < 99 VAL [x=66, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=68, y=4294967295] [L17] COND TRUE x < 99 VAL [x=68, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=70, y=4294967295] [L17] COND TRUE x < 99 VAL [x=70, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=72, y=4294967295] [L17] COND TRUE x < 99 VAL [x=72, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=74, y=4294967295] [L17] COND TRUE x < 99 VAL [x=74, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=76, y=4294967295] [L17] COND TRUE x < 99 VAL [x=76, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=78, y=4294967295] [L17] COND TRUE x < 99 VAL [x=78, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=80, y=4294967295] [L17] COND TRUE x < 99 VAL [x=80, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=82, y=4294967295] [L17] COND TRUE x < 99 VAL [x=82, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=84, y=4294967295] [L17] COND TRUE x < 99 VAL [x=84, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=86, y=4294967295] [L17] COND TRUE x < 99 VAL [x=86, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=88, y=4294967295] [L17] COND TRUE x < 99 VAL [x=88, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=90, y=4294967295] [L17] COND TRUE x < 99 VAL [x=90, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=92, y=4294967295] [L17] COND TRUE x < 99 VAL [x=92, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=94, y=4294967295] [L17] COND TRUE x < 99 VAL [x=94, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=96, y=4294967295] [L17] COND TRUE x < 99 VAL [x=96, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=98, y=4294967295] [L17] COND TRUE x < 99 VAL [x=98, y=4294967295] [L18] COND FALSE !(y % 2 == 0) [L21] x += 2 VAL [x=100, y=4294967295] [L17] COND FALSE !(x < 99) VAL [x=100, y=4294967295] [L25] CALL __VERIFIER_assert((x % 2) == (y % 2)) VAL [\old(cond)=0] [L7] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L8] reach_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 525928.9ms, OverallIterations: 104, TraceHistogramMax: 50, EmptinessCheckTime: 46.0ms, AutomataDifference: 193268.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 5.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 1046 SDtfs, 3402 SDslu, 10784 SDs, 0 SdLazy, 226332 SolverSat, 6891 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 67837.4ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 11843 GetRequests, 5417 SyntacticMatches, 685 SemanticMatches, 5741 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60257 ImplicationChecksByTransitivity, 170399.1ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=213occurred in iteration=103, InterpolantAutomatonStates: 3046, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 285.1ms AutomataMinimizationTime, 103 MinimizatonAttempts, 105 StatesRemovedByMinimization, 102 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 769.9ms SsaConstructionTime, 220103.1ms SatisfiabilityAnalysisTime, 88031.4ms InterpolantComputationTime, 12341 NumberOfCodeBlocks, 12125 NumberOfCodeBlocksAsserted, 1460 NumberOfCheckSat, 12028 ConstructedInterpolants, 0 QuantifiedInterpolants, 76190 SizeOfPredicates, 98 NumberOfNonLiveVariables, 19448 ConjunctsInSsa, 5945 ConjunctsInUnsatCore, 202 InterpolantComputations, 4 PerfectInterpolantSequences, 8/166708 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...