/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/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_11.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:04:42,969 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:04:42,972 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:04:43,006 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:04:43,023 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:04:43,024 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:04:43,026 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:04:43,027 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:04:43,030 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:04:43,030 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:04:43,032 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:04:43,036 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:04:43,037 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:04:43,039 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:04:43,039 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:04:43,041 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:04:43,046 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:04:43,054 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:04:43,055 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:04:43,056 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:04:43,056 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 13:04:43,106 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:04:43,106 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:04:43,109 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:04:43,109 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:04:43,109 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:04:43,109 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:04:43,110 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:04:43,110 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:04:43,110 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:04:43,110 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:04:43,111 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:04:43,111 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:04:43,111 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:04:43,111 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:04:43,111 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:04:43,111 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:04:43,111 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:04:43,111 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:04:43,112 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:04:43,112 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:04:43,112 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:04:43,112 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:04:43,112 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:04:43,112 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:04:43,112 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:04:43,112 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:04:43,113 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:04:43,113 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:04:43,113 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:04:43,391 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:04:43,408 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:04:43,410 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:04:43,411 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:04:43,411 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:04:43,412 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_11.c [2021-05-02 13:04:43,474 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c7e5ff017/ebe09646af8747959c7b1d135930edf4/FLAGaedd8292b [2021-05-02 13:04:43,816 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:04:43,817 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_11.c [2021-05-02 13:04:43,821 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c7e5ff017/ebe09646af8747959c7b1d135930edf4/FLAGaedd8292b [2021-05-02 13:04:43,837 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c7e5ff017/ebe09646af8747959c7b1d135930edf4 [2021-05-02 13:04:43,840 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:04:43,842 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:04:43,846 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:04:43,846 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:04:43,849 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:04:43,850 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:04:43" (1/1) ... [2021-05-02 13:04:43,850 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@526cf512 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:43, skipping insertion in model container [2021-05-02 13:04:43,851 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:04:43" (1/1) ... [2021-05-02 13:04:43,856 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:04:43,865 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:04:43,977 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_11.c[319,332] [2021-05-02 13:04:43,987 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:04:43,995 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:04:44,004 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_11.c[319,332] [2021-05-02 13:04:44,006 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:04:44,017 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:04:44,017 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:44 WrapperNode [2021-05-02 13:04:44,017 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:04:44,018 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:04:44,019 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:04:44,020 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:04:44,039 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:44" (1/1) ... [2021-05-02 13:04:44,040 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:44" (1/1) ... [2021-05-02 13:04:44,053 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:44" (1/1) ... [2021-05-02 13:04:44,053 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:44" (1/1) ... [2021-05-02 13:04:44,071 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:44" (1/1) ... [2021-05-02 13:04:44,076 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:44" (1/1) ... [2021-05-02 13:04:44,077 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:44" (1/1) ... [2021-05-02 13:04:44,080 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:04:44,081 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:04:44,081 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:04:44,081 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:04:44,081 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:44" (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 13:04:44,139 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:04:44,139 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:04:44,140 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:04:44,140 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:04:44,140 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:04:44,140 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:04:44,140 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:04:44,141 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:04:44,141 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:04:44,141 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:04:44,141 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:04:44,141 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:04:44,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:04:44,142 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:04:44,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:04:44,142 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:04:44,142 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:04:44,302 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:04:44,302 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 13:04:44,303 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:04:44 BoogieIcfgContainer [2021-05-02 13:04:44,303 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:04:44,304 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:04:44,305 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:04:44,307 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:04:44,307 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:04:43" (1/3) ... [2021-05-02 13:04:44,307 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@525028dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:04:44, skipping insertion in model container [2021-05-02 13:04:44,307 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:44" (2/3) ... [2021-05-02 13:04:44,308 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@525028dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:04:44, skipping insertion in model container [2021-05-02 13:04:44,308 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:04:44" (3/3) ... [2021-05-02 13:04:44,309 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_11.c [2021-05-02 13:04:44,313 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:04:44,315 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:04:44,327 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:04:44,341 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:04:44,342 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:04:44,342 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:04:44,342 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:04:44,342 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:04:44,342 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:04:44,342 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:04:44,342 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:04:44,352 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:04:44,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:04:44,355 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:44,355 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:44,356 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:44,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:44,359 INFO L82 PathProgramCache]: Analyzing trace with hash 1325153485, now seen corresponding path program 1 times [2021-05-02 13:04:44,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:44,365 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465270341] [2021-05-02 13:04:44,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:44,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:44,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:44,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:44,557 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 13:04:44,557 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:44,558 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465270341] [2021-05-02 13:04:44,558 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465270341] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:04:44,558 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:04:44,558 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:04:44,559 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766463643] [2021-05-02 13:04:44,562 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:04:44,562 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:44,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:04:44,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:04:44,576 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:44,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:44,643 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2021-05-02 13:04:44,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:04:44,645 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 13:04:44,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:44,649 INFO L225 Difference]: With dead ends: 32 [2021-05-02 13:04:44,650 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 13:04:44,655 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 60.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:04:44,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 13:04:44,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-02 13:04:44,684 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 13:04:44,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-05-02 13:04:44,685 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2021-05-02 13:04:44,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:44,686 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-05-02 13:04:44,686 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 13:04:44,686 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-05-02 13:04:44,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:04:44,687 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:44,687 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:44,688 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:04:44,688 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:44,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:44,691 INFO L82 PathProgramCache]: Analyzing trace with hash 1315918275, now seen corresponding path program 1 times [2021-05-02 13:04:44,691 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:44,691 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681772951] [2021-05-02 13:04:44,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:44,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:44,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:44,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:44,852 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 13:04:44,853 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:44,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681772951] [2021-05-02 13:04:44,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [681772951] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:04:44,854 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:04:44,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:04:44,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054752717] [2021-05-02 13:04:44,856 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:04:44,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:44,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:04:44,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:04:44,860 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 13:04:44,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:44,949 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2021-05-02 13:04:44,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:04:44,950 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 13:04:44,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:44,951 INFO L225 Difference]: With dead ends: 22 [2021-05-02 13:04:44,951 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 13:04:44,951 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:04:44,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 13:04:44,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-02 13:04:44,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 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 13:04:44,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-02 13:04:44,955 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-02 13:04:44,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:44,956 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-02 13:04:44,956 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 13:04:44,956 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-02 13:04:44,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 13:04:44,956 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:44,956 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:44,956 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:04:44,956 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:44,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:44,957 INFO L82 PathProgramCache]: Analyzing trace with hash -1372110560, now seen corresponding path program 1 times [2021-05-02 13:04:44,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:44,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904935843] [2021-05-02 13:04:44,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:44,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:45,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:45,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:45,077 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 13:04:45,078 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:45,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [904935843] [2021-05-02 13:04:45,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [904935843] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:45,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821005952] [2021-05-02 13:04:45,078 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 13:04:45,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:45,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:04:45,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:45,170 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 13:04:45,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1821005952] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:45,170 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:45,171 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 13:04:45,171 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158999635] [2021-05-02 13:04:45,171 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:04:45,171 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:45,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:04:45,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:04:45,172 INFO L87 Difference]: Start difference. First operand 15 states and 16 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 13:04:45,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:45,250 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2021-05-02 13:04:45,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:04:45,259 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 13:04:45,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:45,259 INFO L225 Difference]: With dead ends: 24 [2021-05-02 13:04:45,260 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 13:04:45,260 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 84.7ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:04:45,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 13:04:45,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-02 13:04:45,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 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 13:04:45,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2021-05-02 13:04:45,264 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2021-05-02 13:04:45,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:45,264 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2021-05-02 13:04:45,264 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 13:04:45,264 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2021-05-02 13:04:45,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 13:04:45,265 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:45,265 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:45,482 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 13:04:45,483 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:45,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:45,483 INFO L82 PathProgramCache]: Analyzing trace with hash 1002491197, now seen corresponding path program 2 times [2021-05-02 13:04:45,483 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:45,484 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855245434] [2021-05-02 13:04:45,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:45,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:45,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:45,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:45,589 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 13:04:45,589 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:45,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855245434] [2021-05-02 13:04:45,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [855245434] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:45,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1248690746] [2021-05-02 13:04:45,589 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:45,624 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:04:45,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:45,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:04:45,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:45,668 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:45,682 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 13:04:45,682 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1248690746] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:45,682 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:45,682 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 13:04:45,682 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640735847] [2021-05-02 13:04:45,683 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:04:45,683 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:45,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:04:45,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:04:45,684 INFO L87 Difference]: Start difference. First operand 17 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 13:04:45,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:45,791 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-05-02 13:04:45,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:04:45,792 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 13:04:45,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:45,794 INFO L225 Difference]: With dead ends: 26 [2021-05-02 13:04:45,794 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 13:04:45,795 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 107.8ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:04:45,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 13:04:45,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-05-02 13:04:45,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 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 13:04:45,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 13:04:45,804 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2021-05-02 13:04:45,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:45,804 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 13:04:45,804 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 13:04:45,804 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 13:04:45,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:04:45,806 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:45,806 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:46,021 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:46,021 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:46,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:46,022 INFO L82 PathProgramCache]: Analyzing trace with hash -1927821798, now seen corresponding path program 3 times [2021-05-02 13:04:46,022 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:46,023 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360491770] [2021-05-02 13:04:46,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:46,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:46,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:46,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:46,107 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 13:04:46,107 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:46,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360491770] [2021-05-02 13:04:46,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1360491770] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:46,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463990400] [2021-05-02 13:04:46,108 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:46,139 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:04:46,140 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:46,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 13:04:46,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:46,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:46,182 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 13:04:46,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463990400] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:04:46,183 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:04:46,183 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [7] total 8 [2021-05-02 13:04:46,183 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786783116] [2021-05-02 13:04:46,183 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:04:46,183 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:46,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:04:46,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:04:46,184 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:46,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:46,194 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-05-02 13:04:46,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:04:46,195 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 13:04:46,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:46,195 INFO L225 Difference]: With dead ends: 26 [2021-05-02 13:04:46,195 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 13:04:46,196 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 52.5ms TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:04:46,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 13:04:46,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-05-02 13:04:46,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 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 13:04:46,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-05-02 13:04:46,199 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2021-05-02 13:04:46,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:46,199 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-05-02 13:04:46,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:46,199 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-05-02 13:04:46,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 13:04:46,200 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:46,200 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:46,416 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:46,416 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:46,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:46,417 INFO L82 PathProgramCache]: Analyzing trace with hash -402805515, now seen corresponding path program 1 times [2021-05-02 13:04:46,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:46,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [373108527] [2021-05-02 13:04:46,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:46,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:46,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:46,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:46,516 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:46,517 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:46,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [373108527] [2021-05-02 13:04:46,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [373108527] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:46,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11214065] [2021-05-02 13:04:46,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 13:04:46,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:46,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:04:46,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:46,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:46,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:46,632 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:46,632 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [11214065] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:46,633 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:46,633 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 13:04:46,633 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012669646] [2021-05-02 13:04:46,633 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:04:46,633 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:46,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:04:46,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:04:46,634 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 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 13:04:46,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:46,779 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2021-05-02 13:04:46,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:04:46,780 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 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 13:04:46,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:46,780 INFO L225 Difference]: With dead ends: 30 [2021-05-02 13:04:46,781 INFO L226 Difference]: Without dead ends: 22 [2021-05-02 13:04:46,781 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 161.6ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:04:46,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-05-02 13:04:46,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-05-02 13:04:46,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 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 13:04:46,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 13:04:46,784 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 19 [2021-05-02 13:04:46,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:46,784 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 13:04:46,785 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 2 states have call successors, (4), 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 13:04:46,785 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 13:04:46,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 13:04:46,785 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:46,785 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:47,001 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:47,002 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:47,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:47,003 INFO L82 PathProgramCache]: Analyzing trace with hash 1363341138, now seen corresponding path program 2 times [2021-05-02 13:04:47,003 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:47,003 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91417282] [2021-05-02 13:04:47,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:47,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:47,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:47,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:47,082 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:47,082 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:47,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91417282] [2021-05-02 13:04:47,083 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91417282] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:47,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542563721] [2021-05-02 13:04:47,083 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 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 13:04:47,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:04:47,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:47,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 13:04:47,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:47,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:47,174 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 13:04:47,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542563721] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:47,174 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:47,175 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2021-05-02 13:04:47,175 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433176596] [2021-05-02 13:04:47,175 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:04:47,175 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:47,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:04:47,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:04:47,176 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 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 13:04:47,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:47,361 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2021-05-02 13:04:47,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:04:47,361 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 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 21 [2021-05-02 13:04:47,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:47,362 INFO L225 Difference]: With dead ends: 32 [2021-05-02 13:04:47,362 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 13:04:47,362 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 183.6ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:04:47,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 13:04:47,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 13:04:47,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 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 13:04:47,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 13:04:47,366 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 21 [2021-05-02 13:04:47,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:47,367 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 13:04:47,367 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 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 13:04:47,367 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 13:04:47,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 13:04:47,367 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:47,367 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:47,584 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 13:04:47,584 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:47,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:47,585 INFO L82 PathProgramCache]: Analyzing trace with hash 2118192751, now seen corresponding path program 3 times [2021-05-02 13:04:47,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:47,585 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617014204] [2021-05-02 13:04:47,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:47,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:47,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:47,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:47,685 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:47,685 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:47,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617014204] [2021-05-02 13:04:47,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617014204] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:47,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1295817760] [2021-05-02 13:04:47,685 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 13:04:47,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 13:04:47,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:47,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 13:04:47,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:47,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:47,787 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 13:04:47,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1295817760] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:47,788 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:47,788 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 4] total 11 [2021-05-02 13:04:47,788 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991999851] [2021-05-02 13:04:47,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:04:47,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:47,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:04:47,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:04:47,789 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 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 13:04:48,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:48,123 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2021-05-02 13:04:48,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:04:48,124 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 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 13:04:48,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:48,125 INFO L225 Difference]: With dead ends: 39 [2021-05-02 13:04:48,125 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 13:04:48,125 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 318.2ms TimeCoverageRelationStatistics Valid=95, Invalid=285, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:04:48,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 13:04:48,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2021-05-02 13:04:48,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 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 13:04:48,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-02 13:04:48,129 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-05-02 13:04:48,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:48,129 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-02 13:04:48,129 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 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 13:04:48,129 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-02 13:04:48,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 13:04:48,130 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:48,130 INFO L523 BasicCegarLoop]: trace histogram [8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:48,346 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:48,346 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:48,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:48,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1751481511, now seen corresponding path program 4 times [2021-05-02 13:04:48,347 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:48,347 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962483643] [2021-05-02 13:04:48,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:48,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:48,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:48,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:48,455 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:04:48,455 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:48,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962483643] [2021-05-02 13:04:48,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1962483643] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:48,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434535] [2021-05-02 13:04:48,455 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) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:48,504 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:04:48,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:48,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:04:48,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:48,559 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:48,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:48,570 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 21 proven. 42 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:04:48,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434535] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:48,570 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:48,570 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 13:04:48,570 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514383326] [2021-05-02 13:04:48,570 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:04:48,570 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:48,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:04:48,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:04:48,571 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 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 13:04:48,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:48,761 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2021-05-02 13:04:48,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:04:48,761 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 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 13:04:48,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:48,761 INFO L225 Difference]: With dead ends: 40 [2021-05-02 13:04:48,761 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 13:04:48,762 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 209.3ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:04:48,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 13:04:48,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 13:04:48,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 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 13:04:48,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-02 13:04:48,765 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2021-05-02 13:04:48,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:48,765 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-02 13:04:48,765 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 10 states have internal predecessors, (27), 2 states have call successors, (4), 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 13:04:48,765 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-02 13:04:48,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 13:04:48,766 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:48,766 INFO L523 BasicCegarLoop]: trace histogram [9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:48,981 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:48,981 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:48,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:48,982 INFO L82 PathProgramCache]: Analyzing trace with hash 1042616836, now seen corresponding path program 5 times [2021-05-02 13:04:48,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:48,982 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [444668207] [2021-05-02 13:04:48,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:48,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:49,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:49,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:49,097 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:04:49,098 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:49,098 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [444668207] [2021-05-02 13:04:49,098 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [444668207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:49,098 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [262104924] [2021-05-02 13:04:49,098 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 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 13:04:49,147 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 13:04:49,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:49,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 13:04:49,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:49,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,233 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 24 proven. 56 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:04:49,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [262104924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:49,233 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:49,233 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 13:04:49,233 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470535716] [2021-05-02 13:04:49,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:04:49,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:49,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:04:49,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:04:49,234 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 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 13:04:49,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:49,478 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2021-05-02 13:04:49,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:04:49,478 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 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 13:04:49,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:49,479 INFO L225 Difference]: With dead ends: 42 [2021-05-02 13:04:49,479 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 13:04:49,479 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 257.3ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:04:49,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 13:04:49,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 13:04:49,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:49,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-05-02 13:04:49,483 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2021-05-02 13:04:49,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:49,483 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-05-02 13:04:49,483 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 2 states have call successors, (4), 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 13:04:49,483 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-05-02 13:04:49,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 13:04:49,483 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:49,484 INFO L523 BasicCegarLoop]: trace histogram [10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:49,700 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 13:04:49,700 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:49,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:49,701 INFO L82 PathProgramCache]: Analyzing trace with hash -1571503071, now seen corresponding path program 6 times [2021-05-02 13:04:49,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:49,701 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738116193] [2021-05-02 13:04:49,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:49,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:49,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:49,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:49,868 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 27 proven. 72 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:04:49,868 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:49,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738116193] [2021-05-02 13:04:49,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738116193] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:49,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1874908235] [2021-05-02 13:04:49,869 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 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 13:04:49,987 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2021-05-02 13:04:49,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:49,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 13:04:49,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:50,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:50,078 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 13:04:50,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1874908235] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:50,078 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:50,078 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 15 [2021-05-02 13:04:50,078 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880506283] [2021-05-02 13:04:50,078 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:04:50,079 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:50,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:04:50,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:04:50,079 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 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 13:04:50,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:50,396 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-02 13:04:50,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:04:50,396 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 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 31 [2021-05-02 13:04:50,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:50,397 INFO L225 Difference]: With dead ends: 44 [2021-05-02 13:04:50,397 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 13:04:50,397 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 314.9ms TimeCoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:04:50,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 13:04:50,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 13:04:50,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 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 13:04:50,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-05-02 13:04:50,401 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2021-05-02 13:04:50,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:50,401 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-05-02 13:04:50,401 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 14 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 13:04:50,401 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-05-02 13:04:50,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 13:04:50,402 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:50,402 INFO L523 BasicCegarLoop]: trace histogram [11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:50,606 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:50,606 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:50,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:50,607 INFO L82 PathProgramCache]: Analyzing trace with hash -1184865538, now seen corresponding path program 7 times [2021-05-02 13:04:50,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:50,607 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099527451] [2021-05-02 13:04:50,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:50,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:50,744 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:50,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:50,748 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:04:50,748 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:50,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099527451] [2021-05-02 13:04:50,748 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2099527451] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:50,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [646452245] [2021-05-02 13:04:50,748 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 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 13:04:50,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:50,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:04:50,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:50,850 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:50,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:50,859 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 30 proven. 90 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:04:50,860 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [646452245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:50,860 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:50,860 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 13:04:50,860 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545055027] [2021-05-02 13:04:50,860 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:04:50,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:50,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:04:50,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:04:50,861 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 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 13:04:51,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:51,169 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2021-05-02 13:04:51,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:04:51,170 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 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 13:04:51,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:51,170 INFO L225 Difference]: With dead ends: 46 [2021-05-02 13:04:51,170 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 13:04:51,171 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 316.6ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:04:51,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 13:04:51,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 13:04:51,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.096774193548387) internal successors, (34), 31 states have internal predecessors, (34), 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 13:04:51,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-05-02 13:04:51,174 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2021-05-02 13:04:51,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:51,174 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-05-02 13:04:51,175 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.357142857142857) internal successors, (33), 13 states have internal predecessors, (33), 2 states have call successors, (4), 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 13:04:51,175 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-05-02 13:04:51,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 13:04:51,175 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:51,175 INFO L523 BasicCegarLoop]: trace histogram [12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:51,391 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:51,392 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:51,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:51,392 INFO L82 PathProgramCache]: Analyzing trace with hash 1006616219, now seen corresponding path program 8 times [2021-05-02 13:04:51,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:51,392 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076458338] [2021-05-02 13:04:51,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:51,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:51,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:51,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:51,546 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 33 proven. 110 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:04:51,546 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:51,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076458338] [2021-05-02 13:04:51,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1076458338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:51,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012647426] [2021-05-02 13:04:51,547 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 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 13:04:51,601 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:04:51,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:51,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 13:04:51,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:51,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:51,698 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 13:04:51,699 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012647426] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:51,699 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:51,699 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 17 [2021-05-02 13:04:51,699 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13707544] [2021-05-02 13:04:51,699 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 13:04:51,699 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:51,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 13:04:51,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:04:51,700 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 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 13:04:52,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:52,126 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2021-05-02 13:04:52,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 13:04:52,127 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 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 35 [2021-05-02 13:04:52,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:52,128 INFO L225 Difference]: With dead ends: 48 [2021-05-02 13:04:52,128 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 13:04:52,129 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 397.7ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:04:52,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 13:04:52,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 13:04:52,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 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 13:04:52,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-05-02 13:04:52,142 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2021-05-02 13:04:52,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:52,142 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-05-02 13:04:52,142 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.235294117647059) internal successors, (38), 16 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 13:04:52,142 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-05-02 13:04:52,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 13:04:52,143 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:52,143 INFO L523 BasicCegarLoop]: trace histogram [13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:52,358 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 13:04:52,358 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:52,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:52,359 INFO L82 PathProgramCache]: Analyzing trace with hash -1808357640, now seen corresponding path program 9 times [2021-05-02 13:04:52,360 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:52,360 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1446063742] [2021-05-02 13:04:52,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:52,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:52,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:52,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:52,613 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 36 proven. 132 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:04:52,613 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:52,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1446063742] [2021-05-02 13:04:52,613 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1446063742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:52,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [224372718] [2021-05-02 13:04:52,613 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 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 13:04:52,716 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 13:04:52,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:52,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:04:52,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:52,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:52,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:52,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:52,747 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:52,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:52,907 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 55 proven. 4 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-05-02 13:04:52,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [224372718] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:52,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:52,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 5] total 18 [2021-05-02 13:04:52,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39230526] [2021-05-02 13:04:52,908 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:04:52,908 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:52,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:04:52,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:04:52,908 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:53,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:53,613 INFO L93 Difference]: Finished difference Result 53 states and 61 transitions. [2021-05-02 13:04:53,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 13:04:53,614 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 37 [2021-05-02 13:04:53,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:53,614 INFO L225 Difference]: With dead ends: 53 [2021-05-02 13:04:53,614 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 13:04:53,615 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 682.5ms TimeCoverageRelationStatistics Valid=157, Invalid=899, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:04:53,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 13:04:53,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-02 13:04:53,618 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 13:04:53,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-05-02 13:04:53,618 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 37 [2021-05-02 13:04:53,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:53,619 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-05-02 13:04:53,619 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.388888888888889) internal successors, (43), 17 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:53,619 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-05-02 13:04:53,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 13:04:53,619 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:53,619 INFO L523 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:53,823 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 13:04:53,823 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:53,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:53,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1165410256, now seen corresponding path program 10 times [2021-05-02 13:04:53,824 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:53,824 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141194234] [2021-05-02 13:04:53,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:53,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:53,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:53,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:53,996 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:04:53,996 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:53,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141194234] [2021-05-02 13:04:53,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1141194234] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:53,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051555334] [2021-05-02 13:04:53,997 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 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 13:04:54,037 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:04:54,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:54,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 13:04:54,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:54,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:54,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:54,161 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 65 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:04:54,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051555334] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:54,162 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:54,162 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 13:04:54,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199251718] [2021-05-02 13:04:54,162 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 13:04:54,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:54,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 13:04:54,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:04:54,169 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 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 13:04:54,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:54,677 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2021-05-02 13:04:54,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 13:04:54,678 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 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 13:04:54,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:54,679 INFO L225 Difference]: With dead ends: 58 [2021-05-02 13:04:54,679 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 13:04:54,681 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 449.4ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:04:54,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 13:04:54,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 13:04:54,699 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 13:04:54,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-05-02 13:04:54,700 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 41 [2021-05-02 13:04:54,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:54,701 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-05-02 13:04:54,701 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.2941176470588234) internal successors, (39), 16 states have internal predecessors, (39), 2 states have call successors, (4), 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 13:04:54,701 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-05-02 13:04:54,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 13:04:54,703 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:54,703 INFO L523 BasicCegarLoop]: trace histogram [16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:54,916 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 13:04:54,917 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:54,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:54,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1872080589, now seen corresponding path program 11 times [2021-05-02 13:04:54,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:54,917 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [881514138] [2021-05-02 13:04:54,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:54,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:55,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:55,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:55,154 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:04:55,154 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:55,154 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [881514138] [2021-05-02 13:04:55,154 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [881514138] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:55,154 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1626922210] [2021-05-02 13:04:55,154 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 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 13:04:55,637 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 13:04:55,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:55,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 13:04:55,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:55,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:55,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:55,842 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 70 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:04:55,843 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1626922210] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:55,843 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:55,843 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 13:04:55,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663455705] [2021-05-02 13:04:55,843 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:04:55,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:55,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:04:55,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:04:55,844 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 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 13:04:56,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:56,356 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2021-05-02 13:04:56,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:04:56,357 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 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 13:04:56,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:56,358 INFO L225 Difference]: With dead ends: 60 [2021-05-02 13:04:56,358 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 13:04:56,358 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 32 SyntacticMatches, 13 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 595.1ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:04:56,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 13:04:56,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-02 13:04:56,363 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 13:04:56,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2021-05-02 13:04:56,364 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 43 [2021-05-02 13:04:56,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:56,365 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2021-05-02 13:04:56,365 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.2777777777777777) internal successors, (41), 17 states have internal predecessors, (41), 2 states have call successors, (4), 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 13:04:56,365 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2021-05-02 13:04:56,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:04:56,366 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:56,366 INFO L523 BasicCegarLoop]: trace histogram [17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:56,569 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:56,569 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:56,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:56,569 INFO L82 PathProgramCache]: Analyzing trace with hash 323021354, now seen corresponding path program 12 times [2021-05-02 13:04:56,570 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:56,570 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484449635] [2021-05-02 13:04:56,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:56,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:56,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:56,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:56,833 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 75 proven. 210 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 13:04:56,833 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:56,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [484449635] [2021-05-02 13:04:56,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [484449635] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:56,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [327461817] [2021-05-02 13:04:56,833 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 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 13:04:56,979 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-02 13:04:56,979 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:56,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 13:04:56,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:57,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:57,184 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 98 proven. 9 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2021-05-02 13:04:57,184 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [327461817] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:57,184 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:57,184 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 6] total 22 [2021-05-02 13:04:57,184 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989047747] [2021-05-02 13:04:57,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:04:57,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:57,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:04:57,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=374, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:04:57,185 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 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 13:04:58,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:58,261 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2021-05-02 13:04:58,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 13:04:58,261 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 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 13:04:58,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:58,262 INFO L225 Difference]: With dead ends: 66 [2021-05-02 13:04:58,262 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 13:04:58,262 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 996.5ms TimeCoverageRelationStatistics Valid=260, Invalid=1462, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:04:58,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 13:04:58,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2021-05-02 13:04:58,265 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 13:04:58,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-02 13:04:58,266 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 45 [2021-05-02 13:04:58,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:58,266 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-02 13:04:58,266 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 2.3181818181818183) internal successors, (51), 21 states have internal predecessors, (51), 2 states have call successors, (4), 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 13:04:58,266 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-02 13:04:58,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 13:04:58,266 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:58,267 INFO L523 BasicCegarLoop]: trace histogram [19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:58,469 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 13:04:58,470 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:58,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:58,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1558031902, now seen corresponding path program 13 times [2021-05-02 13:04:58,470 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:58,470 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [957869952] [2021-05-02 13:04:58,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:58,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:58,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:58,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:58,720 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:04:58,720 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:58,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [957869952] [2021-05-02 13:04:58,720 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [957869952] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:58,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1380502967] [2021-05-02 13:04:58,720 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 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 13:04:58,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:58,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 34 conjunts are in the unsatisfiable core [2021-05-02 13:04:58,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:58,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:58,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:58,906 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 112 proven. 240 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:04:58,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1380502967] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:58,906 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:58,906 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 13:04:58,906 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16735926] [2021-05-02 13:04:58,906 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 13:04:58,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:58,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 13:04:58,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:04:58,907 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 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 13:04:59,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:59,587 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2021-05-02 13:04:59,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:04:59,587 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 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 13:04:59,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:59,587 INFO L225 Difference]: With dead ends: 68 [2021-05-02 13:04:59,587 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 13:04:59,588 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 49 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 633.2ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:04:59,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 13:04:59,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-02 13:04:59,591 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 13:04:59,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 55 transitions. [2021-05-02 13:04:59,591 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 55 transitions. Word has length 49 [2021-05-02 13:04:59,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:59,591 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 55 transitions. [2021-05-02 13:04:59,591 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 19 states have internal predecessors, (45), 2 states have call successors, (4), 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 13:04:59,591 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 55 transitions. [2021-05-02 13:04:59,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 13:04:59,592 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:59,592 INFO L523 BasicCegarLoop]: trace histogram [20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:59,807 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 13:04:59,807 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:59,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:59,808 INFO L82 PathProgramCache]: Analyzing trace with hash -505883777, now seen corresponding path program 14 times [2021-05-02 13:04:59,808 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:59,808 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549630900] [2021-05-02 13:04:59,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:59,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:00,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:00,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:00,049 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 119 proven. 272 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:05:00,049 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:00,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549630900] [2021-05-02 13:05:00,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549630900] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:00,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383402247] [2021-05-02 13:05:00,050 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 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 13:05:00,097 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:05:00,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:00,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 13:05:00,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:00,249 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:00,255 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 13:05:00,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [383402247] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:00,255 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:00,255 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 23] total 25 [2021-05-02 13:05:00,255 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294529395] [2021-05-02 13:05:00,256 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:05:00,256 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:00,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:05:00,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=536, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:05:00,257 INFO L87 Difference]: Start difference. First operand 53 states and 55 transitions. Second operand has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 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 13:05:01,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:01,079 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2021-05-02 13:05:01,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:05:01,079 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 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 51 [2021-05-02 13:05:01,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:01,080 INFO L225 Difference]: With dead ends: 70 [2021-05-02 13:05:01,080 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 13:05:01,080 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 757.1ms TimeCoverageRelationStatistics Valid=149, Invalid=1573, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:05:01,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 13:05:01,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 13:05:01,084 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 13:05:01,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-02 13:05:01,084 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 51 [2021-05-02 13:05:01,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:01,084 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-02 13:05:01,084 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 24 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 13:05:01,085 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-02 13:05:01,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 13:05:01,085 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:01,085 INFO L523 BasicCegarLoop]: trace histogram [21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:01,301 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:01,301 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:01,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:01,302 INFO L82 PathProgramCache]: Analyzing trace with hash 1291149788, now seen corresponding path program 15 times [2021-05-02 13:05:01,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:01,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1676989938] [2021-05-02 13:05:01,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:01,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:01,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:01,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:01,609 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 126 proven. 306 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 13:05:01,609 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:01,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1676989938] [2021-05-02 13:05:01,609 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1676989938] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:01,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394481645] [2021-05-02 13:05:01,609 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 13:05:01,681 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 13:05:01,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:01,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 13:05:01,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:02,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:02,165 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 153 proven. 16 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2021-05-02 13:05:02,165 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394481645] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:02,165 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:02,165 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 7] total 26 [2021-05-02 13:05:02,165 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824340241] [2021-05-02 13:05:02,165 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:05:02,165 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:02,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:05:02,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=568, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:05:02,166 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 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 13:05:03,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:03,554 INFO L93 Difference]: Finished difference Result 74 states and 81 transitions. [2021-05-02 13:05:03,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:05:03,555 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 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 13:05:03,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:03,555 INFO L225 Difference]: With dead ends: 74 [2021-05-02 13:05:03,556 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 13:05:03,556 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 51 SyntacticMatches, 4 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 1402.4ms TimeCoverageRelationStatistics Valid=241, Invalid=2111, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:05:03,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 13:05:03,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2021-05-02 13:05:03,559 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 13:05:03,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2021-05-02 13:05:03,560 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 53 [2021-05-02 13:05:03,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:03,560 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2021-05-02 13:05:03,560 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.269230769230769) internal successors, (59), 25 states have internal predecessors, (59), 2 states have call successors, (4), 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 13:05:03,560 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2021-05-02 13:05:03,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:05:03,561 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:03,561 INFO L523 BasicCegarLoop]: trace histogram [23, 18, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:03,761 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:03,761 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:03,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:03,762 INFO L82 PathProgramCache]: Analyzing trace with hash 2049406996, now seen corresponding path program 16 times [2021-05-02 13:05:03,762 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:03,762 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108831115] [2021-05-02 13:05:03,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:03,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:04,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:04,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:04,044 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:05:04,045 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:04,045 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108831115] [2021-05-02 13:05:04,045 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1108831115] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:04,045 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1525037735] [2021-05-02 13:05:04,045 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 13:05:04,127 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:05:04,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:04,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 13:05:04,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:04,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:04,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:04,246 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 171 proven. 342 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:05:04,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1525037735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:04,246 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:04,246 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 13:05:04,247 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216793386] [2021-05-02 13:05:04,247 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 13:05:04,247 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:04,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 13:05:04,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:05:04,248 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 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 13:05:05,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:05,128 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2021-05-02 13:05:05,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 13:05:05,129 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 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 13:05:05,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:05,130 INFO L225 Difference]: With dead ends: 78 [2021-05-02 13:05:05,130 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 13:05:05,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 57 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 814.6ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:05:05,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 13:05:05,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-05-02 13:05:05,135 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 13:05:05,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-02 13:05:05,148 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 57 [2021-05-02 13:05:05,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:05,149 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-02 13:05:05,149 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 2.217391304347826) internal successors, (51), 22 states have internal predecessors, (51), 2 states have call successors, (4), 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 13:05:05,149 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-02 13:05:05,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:05:05,149 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:05,149 INFO L523 BasicCegarLoop]: trace histogram [24, 19, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:05,350 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:05,350 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:05,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:05,350 INFO L82 PathProgramCache]: Analyzing trace with hash 214240433, now seen corresponding path program 17 times [2021-05-02 13:05:05,350 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:05,350 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1095650573] [2021-05-02 13:05:05,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:05,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:05,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:05,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:05,672 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 180 proven. 380 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:05:05,673 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:05,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1095650573] [2021-05-02 13:05:05,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1095650573] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:05,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1629633772] [2021-05-02 13:05:05,673 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 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 13:05:06,962 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 13:05:06,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:06,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 13:05:06,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:07,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:07,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:07,158 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 69 proven. 506 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:05:07,158 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1629633772] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:07,158 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:07,158 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 25] total 27 [2021-05-02 13:05:07,159 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971811849] [2021-05-02 13:05:07,159 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 13:05:07,159 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:07,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 13:05:07,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=631, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:05:07,160 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (4), 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 13:05:08,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:08,292 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2021-05-02 13:05:08,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 13:05:08,293 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (4), 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 13:05:08,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:08,293 INFO L225 Difference]: With dead ends: 80 [2021-05-02 13:05:08,293 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 13:05:08,294 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 1013.5ms TimeCoverageRelationStatistics Valid=171, Invalid=1991, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:05:08,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 13:05:08,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-05-02 13:05:08,297 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 13:05:08,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2021-05-02 13:05:08,297 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 59 [2021-05-02 13:05:08,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:08,298 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2021-05-02 13:05:08,298 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 2.185185185185185) internal successors, (59), 26 states have internal predecessors, (59), 2 states have call successors, (4), 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 13:05:08,298 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2021-05-02 13:05:08,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 13:05:08,298 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:08,298 INFO L523 BasicCegarLoop]: trace histogram [25, 20, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:08,502 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 13:05:08,502 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:08,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:08,503 INFO L82 PathProgramCache]: Analyzing trace with hash 1850732046, now seen corresponding path program 18 times [2021-05-02 13:05:08,503 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:08,503 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427852286] [2021-05-02 13:05:08,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:08,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:08,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:08,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:08,838 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 189 proven. 420 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 13:05:08,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:08,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427852286] [2021-05-02 13:05:08,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427852286] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:08,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371283296] [2021-05-02 13:05:08,839 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 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 13:05:09,139 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 23 check-sat command(s) [2021-05-02 13:05:09,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:09,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 13:05:09,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:09,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:09,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:09,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:09,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:09,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:09,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:09,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:09,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:09,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:09,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:09,913 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 260 proven. 123 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2021-05-02 13:05:09,913 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371283296] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:09,913 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:09,913 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 11] total 33 [2021-05-02 13:05:09,913 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322069763] [2021-05-02 13:05:09,914 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:05:09,914 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:09,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:05:09,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=878, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:05:09,914 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand has 33 states, 33 states have (on average 2.242424242424242) internal successors, (74), 32 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 13:05:11,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:11,973 INFO L93 Difference]: Finished difference Result 90 states and 100 transitions. [2021-05-02 13:05:11,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 13:05:11,973 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.242424242424242) internal successors, (74), 32 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 61 [2021-05-02 13:05:11,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:11,975 INFO L225 Difference]: With dead ends: 90 [2021-05-02 13:05:11,975 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 13:05:11,976 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 56 SyntacticMatches, 4 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 2359.2ms TimeCoverageRelationStatistics Valid=519, Invalid=3387, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 13:05:11,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 13:05:11,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 67. [2021-05-02 13:05:11,980 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 13:05:11,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-05-02 13:05:11,981 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 61 [2021-05-02 13:05:11,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:11,981 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-05-02 13:05:11,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.242424242424242) internal successors, (74), 32 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 13:05:11,981 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-05-02 13:05:11,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 13:05:11,981 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:11,981 INFO L523 BasicCegarLoop]: trace histogram [27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:12,185 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 13:05:12,185 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:12,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:12,186 INFO L82 PathProgramCache]: Analyzing trace with hash 1344049862, now seen corresponding path program 19 times [2021-05-02 13:05:12,186 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:12,186 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77596868] [2021-05-02 13:05:12,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:12,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:12,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:12,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:12,559 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 13:05:12,559 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:12,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77596868] [2021-05-02 13:05:12,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77596868] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:12,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1414712898] [2021-05-02 13:05:12,560 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 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 13:05:12,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:12,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 46 conjunts are in the unsatisfiable core [2021-05-02 13:05:12,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:12,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:12,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:12,736 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 242 proven. 462 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 13:05:12,736 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1414712898] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:12,736 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:12,736 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 13:05:12,737 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233224198] [2021-05-02 13:05:12,737 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:05:12,737 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:12,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:05:12,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:05:12,738 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:13,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:13,978 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2021-05-02 13:05:13,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 13:05:13,979 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 13:05:13,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:13,979 INFO L225 Difference]: With dead ends: 88 [2021-05-02 13:05:13,980 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 13:05:13,980 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 1077.5ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:05:13,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 13:05:13,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-05-02 13:05:13,984 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 13:05:13,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-05-02 13:05:13,984 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 65 [2021-05-02 13:05:13,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:13,985 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-05-02 13:05:13,985 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1923076923076925) internal successors, (57), 25 states have internal predecessors, (57), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:13,985 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-05-02 13:05:13,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-02 13:05:13,985 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:13,985 INFO L523 BasicCegarLoop]: trace histogram [28, 22, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:14,202 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:14,202 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:14,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:14,203 INFO L82 PathProgramCache]: Analyzing trace with hash 1943943779, now seen corresponding path program 20 times [2021-05-02 13:05:14,203 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:14,203 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1000974783] [2021-05-02 13:05:14,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:14,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:14,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:14,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:14,593 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 253 proven. 506 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 13:05:14,593 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:14,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1000974783] [2021-05-02 13:05:14,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1000974783] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:14,593 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [415817889] [2021-05-02 13:05:14,593 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 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 13:05:14,639 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:05:14,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:14,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 13:05:14,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:14,912 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:14,919 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 13:05:14,919 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [415817889] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:14,919 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:14,919 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 31] total 33 [2021-05-02 13:05:14,920 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576298655] [2021-05-02 13:05:14,920 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:05:14,920 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:14,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:05:14,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=970, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:05:14,921 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 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 13:05:16,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:16,356 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2021-05-02 13:05:16,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:05:16,356 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 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 67 [2021-05-02 13:05:16,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:16,357 INFO L225 Difference]: With dead ends: 90 [2021-05-02 13:05:16,357 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 13:05:16,358 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1286.0ms TimeCoverageRelationStatistics Valid=201, Invalid=2879, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:05:16,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 13:05:16,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2021-05-02 13:05:16,361 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 13:05:16,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-05-02 13:05:16,361 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 67 [2021-05-02 13:05:16,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:16,362 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-05-02 13:05:16,362 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.121212121212121) internal successors, (70), 32 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 13:05:16,362 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-05-02 13:05:16,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-02 13:05:16,362 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:16,362 INFO L523 BasicCegarLoop]: trace histogram [29, 23, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:16,572 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 13:05:16,573 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:16,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:16,573 INFO L82 PathProgramCache]: Analyzing trace with hash -1378586944, now seen corresponding path program 21 times [2021-05-02 13:05:16,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:16,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466847001] [2021-05-02 13:05:16,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:16,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:16,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:16,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:16,995 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 264 proven. 552 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-05-02 13:05:16,995 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:16,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466847001] [2021-05-02 13:05:16,995 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466847001] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:16,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1925238027] [2021-05-02 13:05:16,995 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 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 13:05:17,144 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 13:05:17,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:17,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 13:05:17,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:17,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:17,996 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 299 proven. 36 refuted. 0 times theorem prover too weak. 506 trivial. 0 not checked. [2021-05-02 13:05:17,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1925238027] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:17,997 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:17,997 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 9] total 34 [2021-05-02 13:05:17,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148326246] [2021-05-02 13:05:17,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:05:17,997 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:17,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:05:17,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=992, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:05:17,998 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 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 13:05:20,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:20,571 INFO L93 Difference]: Finished difference Result 96 states and 104 transitions. [2021-05-02 13:05:20,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 13:05:20,571 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 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 13:05:20,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:20,572 INFO L225 Difference]: With dead ends: 96 [2021-05-02 13:05:20,572 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 13:05:20,573 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 66 SyntacticMatches, 5 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 529 ImplicationChecksByTransitivity, 2834.3ms TimeCoverageRelationStatistics Valid=397, Invalid=3893, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:05:20,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 13:05:20,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 75. [2021-05-02 13:05:20,582 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 13:05:20,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 77 transitions. [2021-05-02 13:05:20,582 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 77 transitions. Word has length 69 [2021-05-02 13:05:20,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:20,582 INFO L480 AbstractCegarLoop]: Abstraction has 75 states and 77 transitions. [2021-05-02 13:05:20,583 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.2058823529411766) internal successors, (75), 33 states have internal predecessors, (75), 2 states have call successors, (4), 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 13:05:20,583 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 77 transitions. [2021-05-02 13:05:20,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 13:05:20,584 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:20,584 INFO L523 BasicCegarLoop]: trace histogram [31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:20,784 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:20,784 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:20,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:20,785 INFO L82 PathProgramCache]: Analyzing trace with hash -49446408, now seen corresponding path program 22 times [2021-05-02 13:05:20,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:20,785 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64008940] [2021-05-02 13:05:20,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:20,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:21,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:21,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:21,244 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 13:05:21,244 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:21,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64008940] [2021-05-02 13:05:21,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64008940] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:21,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530341514] [2021-05-02 13:05:21,244 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 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 13:05:21,288 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:05:21,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:21,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 13:05:21,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:21,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:21,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:21,442 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 325 proven. 600 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 13:05:21,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1530341514] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:21,442 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:21,442 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 13:05:21,443 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369932353] [2021-05-02 13:05:21,444 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 13:05:21,444 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:21,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 13:05:21,444 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:05:21,445 INFO L87 Difference]: Start difference. First operand 75 states and 77 transitions. Second operand has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 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 13:05:22,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:22,830 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2021-05-02 13:05:22,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:05:22,831 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 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 13:05:22,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:22,831 INFO L225 Difference]: With dead ends: 98 [2021-05-02 13:05:22,831 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 13:05:22,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 1202.3ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 13:05:22,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 13:05:22,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2021-05-02 13:05:22,835 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 13:05:22,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-05-02 13:05:22,836 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 73 [2021-05-02 13:05:22,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:22,836 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-05-02 13:05:22,836 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 2.1724137931034484) internal successors, (63), 28 states have internal predecessors, (63), 2 states have call successors, (4), 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 13:05:22,836 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-05-02 13:05:22,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-02 13:05:22,837 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:22,837 INFO L523 BasicCegarLoop]: trace histogram [32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:23,044 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 13:05:23,045 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:23,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:23,045 INFO L82 PathProgramCache]: Analyzing trace with hash 1647328405, now seen corresponding path program 23 times [2021-05-02 13:05:23,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:23,045 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557238189] [2021-05-02 13:05:23,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:23,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:23,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:23,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:23,516 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 13:05:23,516 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:23,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557238189] [2021-05-02 13:05:23,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [557238189] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:23,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1509055451] [2021-05-02 13:05:23,517 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 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 13:05:27,662 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 33 check-sat command(s) [2021-05-02 13:05:27,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:27,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 13:05:27,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:28,242 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 338 proven. 650 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 13:05:28,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1509055451] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:28,242 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:28,242 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 13:05:28,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713254978] [2021-05-02 13:05:28,243 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 13:05:28,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:28,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 13:05:28,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:05:28,244 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 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 13:05:29,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:29,726 INFO L93 Difference]: Finished difference Result 100 states and 105 transitions. [2021-05-02 13:05:29,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 13:05:29,727 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 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 13:05:29,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:29,727 INFO L225 Difference]: With dead ends: 100 [2021-05-02 13:05:29,727 INFO L226 Difference]: Without dead ends: 79 [2021-05-02 13:05:29,728 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 52 SyntacticMatches, 25 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 1697.3ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:05:29,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-02 13:05:29,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-05-02 13:05:29,732 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 13:05:29,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 81 transitions. [2021-05-02 13:05:29,732 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 81 transitions. Word has length 75 [2021-05-02 13:05:29,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:29,733 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 81 transitions. [2021-05-02 13:05:29,733 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.1666666666666665) internal successors, (65), 29 states have internal predecessors, (65), 2 states have call successors, (4), 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 13:05:29,733 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 81 transitions. [2021-05-02 13:05:29,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-02 13:05:29,733 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:29,733 INFO L523 BasicCegarLoop]: trace histogram [33, 26, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:29,939 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 13:05:29,939 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:29,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:29,939 INFO L82 PathProgramCache]: Analyzing trace with hash 160351218, now seen corresponding path program 24 times [2021-05-02 13:05:29,939 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:29,939 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134935743] [2021-05-02 13:05:29,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:29,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:30,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:30,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:30,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 351 proven. 702 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 13:05:30,435 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:30,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134935743] [2021-05-02 13:05:30,435 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134935743] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:30,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [421687099] [2021-05-02 13:05:30,435 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 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 13:05:31,694 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 13:05:31,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:31,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 13:05:31,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:31,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:31,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:31,733 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:31,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:32,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:32,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:32,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:32,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:33,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:33,739 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 606 proven. 299 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2021-05-02 13:05:33,739 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [421687099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:33,739 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:33,739 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 21] total 49 [2021-05-02 13:05:33,739 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79499787] [2021-05-02 13:05:33,740 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:05:33,740 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:33,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:05:33,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=483, Invalid=1869, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:05:33,741 INFO L87 Difference]: Start difference. First operand 79 states and 81 transitions. Second operand has 49 states, 49 states have (on average 2.163265306122449) internal successors, (106), 48 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 13:05:36,289 WARN L205 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:05:38,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:38,694 INFO L93 Difference]: Finished difference Result 126 states and 144 transitions. [2021-05-02 13:05:38,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 13:05:38,694 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.163265306122449) internal successors, (106), 48 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 77 [2021-05-02 13:05:38,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:38,695 INFO L225 Difference]: With dead ends: 126 [2021-05-02 13:05:38,695 INFO L226 Difference]: Without dead ends: 105 [2021-05-02 13:05:38,697 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 61 SyntacticMatches, 7 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1585 ImplicationChecksByTransitivity, 6352.4ms TimeCoverageRelationStatistics Valid=1409, Invalid=7521, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 13:05:38,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-02 13:05:38,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 83. [2021-05-02 13:05:38,701 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 13:05:38,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-05-02 13:05:38,702 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 77 [2021-05-02 13:05:38,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:38,702 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-05-02 13:05:38,702 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.163265306122449) internal successors, (106), 48 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 13:05:38,702 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-05-02 13:05:38,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-02 13:05:38,702 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:38,703 INFO L523 BasicCegarLoop]: trace histogram [35, 27, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:38,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 13:05:38,908 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:38,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:38,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1586374058, now seen corresponding path program 25 times [2021-05-02 13:05:38,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:38,908 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726918084] [2021-05-02 13:05:38,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:38,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:39,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:39,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:39,465 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 13:05:39,466 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:39,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [726918084] [2021-05-02 13:05:39,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [726918084] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:39,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406833570] [2021-05-02 13:05:39,466 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 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 13:05:39,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:39,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 13:05:39,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:39,663 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:39,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:39,686 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 420 proven. 756 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 13:05:39,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [406833570] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:39,686 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:39,686 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 13:05:39,686 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935438057] [2021-05-02 13:05:39,687 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 13:05:39,687 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:39,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 13:05:39,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:05:39,687 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:41,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:41,432 INFO L93 Difference]: Finished difference Result 108 states and 113 transitions. [2021-05-02 13:05:41,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:05:41,433 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 81 [2021-05-02 13:05:41,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:41,433 INFO L225 Difference]: With dead ends: 108 [2021-05-02 13:05:41,433 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 13:05:41,434 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 1508.6ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 13:05:41,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 13:05:41,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-05-02 13:05:41,439 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 13:05:41,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-05-02 13:05:41,439 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 81 [2021-05-02 13:05:41,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:41,439 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-05-02 13:05:41,439 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 2.15625) internal successors, (69), 31 states have internal predecessors, (69), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:41,440 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-05-02 13:05:41,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 13:05:41,440 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:41,440 INFO L523 BasicCegarLoop]: trace histogram [36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:41,648 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:41,649 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:41,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:41,649 INFO L82 PathProgramCache]: Analyzing trace with hash 676262727, now seen corresponding path program 26 times [2021-05-02 13:05:41,649 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:41,649 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882442839] [2021-05-02 13:05:41,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:41,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:42,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:42,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:42,235 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 435 proven. 812 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 13:05:42,236 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:42,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882442839] [2021-05-02 13:05:42,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882442839] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:42,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1313804295] [2021-05-02 13:05:42,236 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 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 13:05:42,293 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:05:42,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:42,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 75 conjunts are in the unsatisfiable core [2021-05-02 13:05:42,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:42,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:42,723 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 13:05:42,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1313804295] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:42,723 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:42,723 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 39] total 41 [2021-05-02 13:05:42,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028400385] [2021-05-02 13:05:42,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 13:05:42,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:42,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 13:05:42,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1532, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:05:42,724 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 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 13:05:44,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:44,770 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2021-05-02 13:05:44,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 13:05:44,770 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 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 83 [2021-05-02 13:05:44,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:44,771 INFO L225 Difference]: With dead ends: 110 [2021-05-02 13:05:44,771 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 13:05:44,773 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 76 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 1898.3ms TimeCoverageRelationStatistics Valid=253, Invalid=4577, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 13:05:44,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 13:05:44,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2021-05-02 13:05:44,778 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 13:05:44,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-02 13:05:44,778 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 83 [2021-05-02 13:05:44,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:44,778 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-02 13:05:44,778 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.097560975609756) internal successors, (86), 40 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 13:05:44,779 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-02 13:05:44,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 13:05:44,779 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:44,779 INFO L523 BasicCegarLoop]: trace histogram [37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:44,996 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 13:05:44,997 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:44,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:44,997 INFO L82 PathProgramCache]: Analyzing trace with hash -2062365276, now seen corresponding path program 27 times [2021-05-02 13:05:44,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:44,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31014578] [2021-05-02 13:05:44,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:45,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:45,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:45,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:45,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 450 proven. 870 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-05-02 13:05:45,559 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:45,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31014578] [2021-05-02 13:05:45,559 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [31014578] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:45,559 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151952184] [2021-05-02 13:05:45,559 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 13:05:45,699 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-05-02 13:05:45,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:45,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:05:45,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:46,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:46,259 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 493 proven. 64 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-05-02 13:05:46,260 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1151952184] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:46,260 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:46,260 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 11] total 42 [2021-05-02 13:05:46,260 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222863493] [2021-05-02 13:05:46,260 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 13:05:46,260 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:46,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 13:05:46,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=1458, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:05:46,261 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 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 13:05:49,090 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 13:05:49,853 WARN L205 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 13:05:50,348 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 13:05:50,912 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 13:05:52,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:52,165 INFO L93 Difference]: Finished difference Result 116 states and 124 transitions. [2021-05-02 13:05:52,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 13:05:52,166 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 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 13:05:52,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:52,166 INFO L225 Difference]: With dead ends: 116 [2021-05-02 13:05:52,166 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 13:05:52,167 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 86 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 832 ImplicationChecksByTransitivity, 5837.2ms TimeCoverageRelationStatistics Valid=731, Invalid=5911, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 13:05:52,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 13:05:52,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2021-05-02 13:05:52,172 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 13:05:52,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2021-05-02 13:05:52,172 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 85 [2021-05-02 13:05:52,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:52,173 INFO L480 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2021-05-02 13:05:52,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.1666666666666665) internal successors, (91), 41 states have internal predecessors, (91), 2 states have call successors, (4), 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 13:05:52,173 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2021-05-02 13:05:52,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 13:05:52,173 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:52,173 INFO L523 BasicCegarLoop]: trace histogram [39, 30, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:52,376 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:52,376 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:52,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:52,376 INFO L82 PathProgramCache]: Analyzing trace with hash 364535260, now seen corresponding path program 28 times [2021-05-02 13:05:52,377 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:52,377 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136920993] [2021-05-02 13:05:52,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:52,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:52,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:52,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:52,987 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 13:05:52,987 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:52,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136920993] [2021-05-02 13:05:52,987 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136920993] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:52,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1351622380] [2021-05-02 13:05:52,987 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 13:05:53,034 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:05:53,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:53,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 13:05:53,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:53,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:53,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:53,216 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 527 proven. 930 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 13:05:53,216 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1351622380] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:53,216 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:53,216 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 13:05:53,216 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308509456] [2021-05-02 13:05:53,217 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:05:53,217 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:53,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:05:53,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:05:53,217 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 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 13:05:55,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:55,090 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2021-05-02 13:05:55,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 13:05:55,091 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 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 13:05:55,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:55,091 INFO L225 Difference]: With dead ends: 118 [2021-05-02 13:05:55,091 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 13:05:55,092 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 470 ImplicationChecksByTransitivity, 1648.5ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:05:55,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 13:05:55,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-02 13:05:55,097 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 13:05:55,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-05-02 13:05:55,098 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 89 [2021-05-02 13:05:55,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:55,098 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-05-02 13:05:55,098 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.142857142857143) internal successors, (75), 34 states have internal predecessors, (75), 2 states have call successors, (4), 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 13:05:55,098 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-05-02 13:05:55,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-05-02 13:05:55,098 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:55,098 INFO L523 BasicCegarLoop]: trace histogram [40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:55,309 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 13:05:55,309 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:55,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:55,309 INFO L82 PathProgramCache]: Analyzing trace with hash -631882119, now seen corresponding path program 29 times [2021-05-02 13:05:55,309 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:55,309 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628940545] [2021-05-02 13:05:55,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:55,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:55,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:55,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:55,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 544 proven. 992 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 13:05:55,941 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:55,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628940545] [2021-05-02 13:05:55,941 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [628940545] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:55,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1263765492] [2021-05-02 13:05:55,941 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 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 13:06:03,400 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 41 check-sat command(s) [2021-05-02 13:06:03,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:03,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 13:06:03,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:04,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:04,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:04,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 442 proven. 1122 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-05-02 13:06:04,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1263765492] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:04,134 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:04,134 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 36] total 38 [2021-05-02 13:06:04,134 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153634662] [2021-05-02 13:06:04,135 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 13:06:04,135 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:04,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 13:06:04,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1301, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:06:04,135 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 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 13:06:06,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:06,312 INFO L93 Difference]: Finished difference Result 120 states and 125 transitions. [2021-05-02 13:06:06,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 13:06:06,312 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 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 13:06:06,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:06,313 INFO L225 Difference]: With dead ends: 120 [2021-05-02 13:06:06,313 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 13:06:06,313 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 70 SyntacticMatches, 21 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 544 ImplicationChecksByTransitivity, 2288.0ms TimeCoverageRelationStatistics Valid=265, Invalid=4565, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 13:06:06,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 13:06:06,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2021-05-02 13:06:06,319 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 13:06:06,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2021-05-02 13:06:06,319 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 91 [2021-05-02 13:06:06,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:06,320 INFO L480 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2021-05-02 13:06:06,320 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 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 13:06:06,320 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2021-05-02 13:06:06,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 13:06:06,320 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:06,320 INFO L523 BasicCegarLoop]: trace histogram [41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:06,526 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 13:06:06,526 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:06,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:06,527 INFO L82 PathProgramCache]: Analyzing trace with hash -411276330, now seen corresponding path program 30 times [2021-05-02 13:06:06,527 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:06,527 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1269883863] [2021-05-02 13:06:06,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:06,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:07,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:07,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:07,223 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 561 proven. 1056 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-05-02 13:06:07,223 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:07,223 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1269883863] [2021-05-02 13:06:07,223 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1269883863] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:07,223 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196353134] [2021-05-02 13:06:07,223 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 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 13:06:11,651 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 39 check-sat command(s) [2021-05-02 13:06:11,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:11,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 104 conjunts are in the unsatisfiable core [2021-05-02 13:06:11,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:11,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:11,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:13,502 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:13,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:15,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:15,346 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 753 proven. 816 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-02 13:06:15,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [196353134] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:15,346 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:15,346 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 32] total 62 [2021-05-02 13:06:15,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966971810] [2021-05-02 13:06:15,346 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 13:06:15,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:15,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 13:06:15,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=680, Invalid=3102, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 13:06:15,347 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 62 states, 62 states have (on average 2.129032258064516) internal successors, (132), 61 states have internal predecessors, (132), 2 states have call successors, (4), 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 13:06:21,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:21,803 INFO L93 Difference]: Finished difference Result 156 states and 179 transitions. [2021-05-02 13:06:21,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-02 13:06:21,804 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.129032258064516) internal successors, (132), 61 states have internal predecessors, (132), 2 states have call successors, (4), 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 13:06:21,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:21,804 INFO L225 Difference]: With dead ends: 156 [2021-05-02 13:06:21,804 INFO L226 Difference]: Without dead ends: 131 [2021-05-02 13:06:21,805 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 68 SyntacticMatches, 12 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2771 ImplicationChecksByTransitivity, 8377.7ms TimeCoverageRelationStatistics Valid=2051, Invalid=12469, Unknown=0, NotChecked=0, Total=14520 [2021-05-02 13:06:21,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-02 13:06:21,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 99. [2021-05-02 13:06:21,812 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 13:06:21,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 101 transitions. [2021-05-02 13:06:21,812 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 101 transitions. Word has length 93 [2021-05-02 13:06:21,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:21,817 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 101 transitions. [2021-05-02 13:06:21,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 2.129032258064516) internal successors, (132), 61 states have internal predecessors, (132), 2 states have call successors, (4), 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 13:06:21,817 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 101 transitions. [2021-05-02 13:06:21,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-05-02 13:06:21,817 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:21,817 INFO L523 BasicCegarLoop]: trace histogram [43, 33, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:22,018 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 13:06:22,018 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:22,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:22,019 INFO L82 PathProgramCache]: Analyzing trace with hash -986314098, now seen corresponding path program 31 times [2021-05-02 13:06:22,019 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:22,019 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452440672] [2021-05-02 13:06:22,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:22,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:22,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:22,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:23,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 13:06:23,018 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:23,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452440672] [2021-05-02 13:06:23,018 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452440672] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:23,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456341545] [2021-05-02 13:06:23,019 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 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 13:06:23,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:23,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 70 conjunts are in the unsatisfiable core [2021-05-02 13:06:23,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:23,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:23,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:23,308 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 646 proven. 1122 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 13:06:23,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456341545] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:23,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:23,309 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 13:06:23,309 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220292155] [2021-05-02 13:06:23,309 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 13:06:23,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:23,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 13:06:23,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:06:23,310 INFO L87 Difference]: Start difference. First operand 99 states and 101 transitions. Second operand has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 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 13:06:25,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:25,621 INFO L93 Difference]: Finished difference Result 128 states and 133 transitions. [2021-05-02 13:06:25,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 13:06:25,622 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 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 13:06:25,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:25,623 INFO L225 Difference]: With dead ends: 128 [2021-05-02 13:06:25,623 INFO L226 Difference]: Without dead ends: 101 [2021-05-02 13:06:25,623 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 2142.7ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 13:06:25,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-05-02 13:06:25,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2021-05-02 13:06:25,630 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 13:06:25,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 103 transitions. [2021-05-02 13:06:25,630 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 103 transitions. Word has length 97 [2021-05-02 13:06:25,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:25,630 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 103 transitions. [2021-05-02 13:06:25,630 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 2.1315789473684212) internal successors, (81), 37 states have internal predecessors, (81), 2 states have call successors, (4), 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 13:06:25,630 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 103 transitions. [2021-05-02 13:06:25,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-05-02 13:06:25,631 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:25,631 INFO L523 BasicCegarLoop]: trace histogram [44, 34, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:25,831 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 13:06:25,832 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:25,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:25,838 INFO L82 PathProgramCache]: Analyzing trace with hash -1914044885, now seen corresponding path program 32 times [2021-05-02 13:06:25,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:25,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743168322] [2021-05-02 13:06:25,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:25,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:26,634 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:26,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:26,638 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 665 proven. 1190 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 13:06:26,638 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:26,638 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743168322] [2021-05-02 13:06:26,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [743168322] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:26,638 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742492724] [2021-05-02 13:06:26,638 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 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 13:06:26,695 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:06:26,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:26,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 13:06:26,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:27,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:27,285 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 13:06:27,285 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1742492724] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:27,285 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:27,285 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 47] total 49 [2021-05-02 13:06:27,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967333228] [2021-05-02 13:06:27,286 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:06:27,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:27,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:06:27,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=2222, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:06:27,287 INFO L87 Difference]: Start difference. First operand 101 states and 103 transitions. Second operand has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 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 13:06:30,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:30,312 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2021-05-02 13:06:30,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 13:06:30,312 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 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 99 [2021-05-02 13:06:30,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:30,313 INFO L225 Difference]: With dead ends: 130 [2021-05-02 13:06:30,313 INFO L226 Difference]: Without dead ends: 103 [2021-05-02 13:06:30,314 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 619 ImplicationChecksByTransitivity, 2602.3ms TimeCoverageRelationStatistics Valid=305, Invalid=6667, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 13:06:30,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-02 13:06:30,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-05-02 13:06:30,324 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 13:06:30,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-02 13:06:30,325 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 99 [2021-05-02 13:06:30,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:30,325 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-02 13:06:30,325 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 48 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 13:06:30,325 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-02 13:06:30,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 13:06:30,325 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:30,326 INFO L523 BasicCegarLoop]: trace histogram [45, 35, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:30,526 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 13:06:30,526 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:30,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:30,527 INFO L82 PathProgramCache]: Analyzing trace with hash -110133624, now seen corresponding path program 33 times [2021-05-02 13:06:30,527 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:30,527 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724897688] [2021-05-02 13:06:30,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:30,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:31,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:31,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:31,349 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 684 proven. 1260 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 13:06:31,349 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:31,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724897688] [2021-05-02 13:06:31,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724897688] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:31,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611601337] [2021-05-02 13:06:31,349 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 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 13:06:31,678 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-05-02 13:06:31,679 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:31,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 13:06:31,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:33,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:33,940 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 735 proven. 100 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2021-05-02 13:06:33,940 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611601337] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:33,940 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:33,940 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 13] total 50 [2021-05-02 13:06:33,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885825108] [2021-05-02 13:06:33,941 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 13:06:33,941 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:33,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 13:06:33,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=2284, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 13:06:33,941 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 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 13:06:39,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:39,395 INFO L93 Difference]: Finished difference Result 134 states and 141 transitions. [2021-05-02 13:06:39,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 13:06:39,395 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 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 13:06:39,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:39,396 INFO L225 Difference]: With dead ends: 134 [2021-05-02 13:06:39,396 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 13:06:39,397 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 95 SyntacticMatches, 8 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1118 ImplicationChecksByTransitivity, 5388.6ms TimeCoverageRelationStatistics Valid=493, Invalid=8819, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 13:06:39,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 13:06:39,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2021-05-02 13:06:39,403 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 13:06:39,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2021-05-02 13:06:39,404 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 101 [2021-05-02 13:06:39,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:39,404 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2021-05-02 13:06:39,404 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.14) internal successors, (107), 49 states have internal predecessors, (107), 2 states have call successors, (4), 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 13:06:39,404 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2021-05-02 13:06:39,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 13:06:39,405 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:39,405 INFO L523 BasicCegarLoop]: trace histogram [47, 36, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:39,609 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 13:06:39,609 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:39,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:39,609 INFO L82 PathProgramCache]: Analyzing trace with hash -819131456, now seen corresponding path program 34 times [2021-05-02 13:06:39,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:39,609 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750169566] [2021-05-02 13:06:39,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:39,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:40,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:40,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:40,493 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:06:40,493 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:40,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750169566] [2021-05-02 13:06:40,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750169566] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:40,494 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801364906] [2021-05-02 13:06:40,494 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 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 13:06:40,563 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:06:40,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:06:40,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-02 13:06:40,566 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:06:40,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:40,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:06:40,818 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 777 proven. 1332 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:06:40,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1801364906] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:40,818 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:06:40,818 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 13:06:40,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454957808] [2021-05-02 13:06:40,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 13:06:40,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:06:40,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 13:06:40,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:06:40,819 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 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 13:06:43,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:06:43,587 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2021-05-02 13:06:43,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 13:06:43,588 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 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 13:06:43,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:06:43,588 INFO L225 Difference]: With dead ends: 138 [2021-05-02 13:06:43,588 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 13:06:43,589 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 2325.3ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 13:06:43,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 13:06:43,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2021-05-02 13:06:43,596 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 13:06:43,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-02 13:06:43,597 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 105 [2021-05-02 13:06:43,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:06:43,597 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-02 13:06:43,597 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 2.1219512195121952) internal successors, (87), 40 states have internal predecessors, (87), 2 states have call successors, (4), 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 13:06:43,597 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-02 13:06:43,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 13:06:43,597 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:06:43,597 INFO L523 BasicCegarLoop]: trace histogram [48, 37, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:06:43,811 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 13:06:43,811 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:06:43,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:06:43,812 INFO L82 PathProgramCache]: Analyzing trace with hash 406196829, now seen corresponding path program 35 times [2021-05-02 13:06:43,812 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:06:43,812 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211521494] [2021-05-02 13:06:43,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:06:43,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:44,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:06:44,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:06:44,979 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 798 proven. 1406 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:06:44,979 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:06:44,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [211521494] [2021-05-02 13:06:44,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [211521494] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:06:44,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1690206353] [2021-05-02 13:06:44,979 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 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 13:07:05,391 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 49 check-sat command(s) [2021-05-02 13:07:05,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:05,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 13:07:05,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:05,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:05,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:05,744 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 741 proven. 1482 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 13:07:05,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1690206353] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:05,745 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:05,745 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 43 [2021-05-02 13:07:05,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606513098] [2021-05-02 13:07:05,745 INFO L460 AbstractCegarLoop]: Interpolant automaton has 43 states [2021-05-02 13:07:05,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:05,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-05-02 13:07:05,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=1685, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 13:07:05,746 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 states have internal predecessors, (91), 2 states have call successors, (4), 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 13:07:09,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:09,385 INFO L93 Difference]: Finished difference Result 140 states and 145 transitions. [2021-05-02 13:07:09,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 13:07:09,386 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 states have internal predecessors, (91), 2 states have call successors, (4), 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 13:07:09,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:09,386 INFO L225 Difference]: With dead ends: 140 [2021-05-02 13:07:09,386 INFO L226 Difference]: Without dead ends: 111 [2021-05-02 13:07:09,387 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 104 SyntacticMatches, 4 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 3129.7ms TimeCoverageRelationStatistics Valid=311, Invalid=6169, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 13:07:09,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-05-02 13:07:09,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2021-05-02 13:07:09,395 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 13:07:09,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 113 transitions. [2021-05-02 13:07:09,395 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 113 transitions. Word has length 107 [2021-05-02 13:07:09,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:09,396 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 113 transitions. [2021-05-02 13:07:09,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 43 states, 43 states have (on average 2.116279069767442) internal successors, (91), 42 states have internal predecessors, (91), 2 states have call successors, (4), 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 13:07:09,396 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 113 transitions. [2021-05-02 13:07:09,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-02 13:07:09,396 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:09,396 INFO L523 BasicCegarLoop]: trace histogram [49, 38, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:09,597 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 13:07:09,597 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:09,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:09,598 INFO L82 PathProgramCache]: Analyzing trace with hash 1125639610, now seen corresponding path program 36 times [2021-05-02 13:07:09,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:09,598 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371086746] [2021-05-02 13:07:09,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:09,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:10,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:10,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:10,687 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 819 proven. 1482 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:07:10,687 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:10,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371086746] [2021-05-02 13:07:10,687 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1371086746] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:10,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136548957] [2021-05-02 13:07:10,687 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 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 13:07:20,417 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 47 check-sat command(s) [2021-05-02 13:07:20,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:20,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 103 conjunts are in the unsatisfiable core [2021-05-02 13:07:20,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:20,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:20,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:20,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:20,523 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:22,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:22,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:22,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:22,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:22,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:22,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:22,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:25,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:25,244 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 853 proven. 1274 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2021-05-02 13:07:25,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2136548957] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:25,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:25,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 34] total 67 [2021-05-02 13:07:25,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938030229] [2021-05-02 13:07:25,245 INFO L460 AbstractCegarLoop]: Interpolant automaton has 67 states [2021-05-02 13:07:25,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:25,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-05-02 13:07:25,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=816, Invalid=3606, Unknown=0, NotChecked=0, Total=4422 [2021-05-02 13:07:25,246 INFO L87 Difference]: Start difference. First operand 111 states and 113 transitions. Second operand has 67 states, 67 states have (on average 2.1194029850746268) internal successors, (142), 66 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:31,073 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 13:07:32,760 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 13:07:33,822 WARN L205 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 13:07:34,791 WARN L205 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 13:07:35,941 WARN L205 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 13:07:38,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:38,679 INFO L93 Difference]: Finished difference Result 170 states and 190 transitions. [2021-05-02 13:07:38,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-02 13:07:38,679 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 2.1194029850746268) internal successors, (142), 66 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 109 [2021-05-02 13:07:38,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:38,680 INFO L225 Difference]: With dead ends: 170 [2021-05-02 13:07:38,680 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 13:07:38,681 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 91 SyntacticMatches, 8 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2878 ImplicationChecksByTransitivity, 16182.0ms TimeCoverageRelationStatistics Valid=2363, Invalid=14667, Unknown=0, NotChecked=0, Total=17030 [2021-05-02 13:07:38,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 13:07:38,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 115. [2021-05-02 13:07:38,688 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 13:07:38,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 117 transitions. [2021-05-02 13:07:38,705 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 117 transitions. Word has length 109 [2021-05-02 13:07:38,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:38,705 INFO L480 AbstractCegarLoop]: Abstraction has 115 states and 117 transitions. [2021-05-02 13:07:38,706 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 67 states, 67 states have (on average 2.1194029850746268) internal successors, (142), 66 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:07:38,706 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 117 transitions. [2021-05-02 13:07:38,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2021-05-02 13:07:38,706 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:38,706 INFO L523 BasicCegarLoop]: trace histogram [51, 39, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:38,907 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:07:38,907 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:38,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:38,907 INFO L82 PathProgramCache]: Analyzing trace with hash -1823260302, now seen corresponding path program 37 times [2021-05-02 13:07:38,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:38,907 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54322533] [2021-05-02 13:07:38,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:38,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:39,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:39,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:39,975 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 13:07:39,976 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:39,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54322533] [2021-05-02 13:07:39,976 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54322533] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:39,976 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021700279] [2021-05-02 13:07:39,976 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 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 13:07:40,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:40,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 13:07:40,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:40,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:40,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:40,376 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 920 proven. 1560 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 13:07:40,377 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1021700279] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:40,377 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:40,377 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 13:07:40,377 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947738715] [2021-05-02 13:07:40,377 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 13:07:40,377 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:40,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 13:07:40,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 13:07:40,378 INFO L87 Difference]: Start difference. First operand 115 states and 117 transitions. Second operand has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 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 13:07:43,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:43,498 INFO L93 Difference]: Finished difference Result 148 states and 153 transitions. [2021-05-02 13:07:43,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 13:07:43,498 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 113 [2021-05-02 13:07:43,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:43,499 INFO L225 Difference]: With dead ends: 148 [2021-05-02 13:07:43,499 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 13:07:43,500 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 113 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 785 ImplicationChecksByTransitivity, 2616.4ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 13:07:43,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 13:07:43,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-05-02 13:07:43,512 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 13:07:43,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-05-02 13:07:43,512 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 113 [2021-05-02 13:07:43,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:43,512 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-05-02 13:07:43,512 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 2.1136363636363638) internal successors, (93), 43 states have internal predecessors, (93), 2 states have call successors, (4), 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 13:07:43,512 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-05-02 13:07:43,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-02 13:07:43,513 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:43,513 INFO L523 BasicCegarLoop]: trace histogram [52, 40, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:43,713 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:07:43,714 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:43,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:43,714 INFO L82 PathProgramCache]: Analyzing trace with hash 1273912079, now seen corresponding path program 38 times [2021-05-02 13:07:43,714 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:43,714 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74776787] [2021-05-02 13:07:43,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:43,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:44,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:44,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:44,785 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 943 proven. 1640 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 13:07:44,786 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:44,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74776787] [2021-05-02 13:07:44,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74776787] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:44,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [526479295] [2021-05-02 13:07:44,786 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 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 13:07:44,844 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:07:44,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:44,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 107 conjunts are in the unsatisfiable core [2021-05-02 13:07:44,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:45,631 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:45,638 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:07:45,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [526479295] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:45,638 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:45,638 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 55] total 57 [2021-05-02 13:07:45,638 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905554760] [2021-05-02 13:07:45,638 INFO L460 AbstractCegarLoop]: Interpolant automaton has 57 states [2021-05-02 13:07:45,638 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:45,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-05-02 13:07:45,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=3040, Unknown=0, NotChecked=0, Total=3192 [2021-05-02 13:07:45,639 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 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 13:07:49,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:07:49,865 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2021-05-02 13:07:49,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-05-02 13:07:49,865 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 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 115 [2021-05-02 13:07:49,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:07:49,866 INFO L225 Difference]: With dead ends: 150 [2021-05-02 13:07:49,866 INFO L226 Difference]: Without dead ends: 119 [2021-05-02 13:07:49,867 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 848 ImplicationChecksByTransitivity, 3541.5ms TimeCoverageRelationStatistics Valid=357, Invalid=9149, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 13:07:49,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-05-02 13:07:49,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-05-02 13:07:49,876 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 13:07:49,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-05-02 13:07:49,876 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 115 [2021-05-02 13:07:49,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:07:49,877 INFO L480 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-05-02 13:07:49,877 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 57 states, 57 states have (on average 2.0701754385964914) internal successors, (118), 56 states have internal predecessors, (118), 2 states have call successors, (4), 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 13:07:49,877 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-05-02 13:07:49,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-02 13:07:49,877 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:07:49,877 INFO L523 BasicCegarLoop]: trace histogram [53, 41, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:07:50,094 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 13:07:50,094 INFO L428 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:07:50,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:07:50,095 INFO L82 PathProgramCache]: Analyzing trace with hash 1244234092, now seen corresponding path program 39 times [2021-05-02 13:07:50,095 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:07:50,096 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881013250] [2021-05-02 13:07:50,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:07:50,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:51,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:07:51,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:07:51,201 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 966 proven. 1722 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2021-05-02 13:07:51,202 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:07:51,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881013250] [2021-05-02 13:07:51,202 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1881013250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:51,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50429021] [2021-05-02 13:07:51,202 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 13:07:51,540 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-05-02 13:07:51,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:07:51,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 13:07:51,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:07:53,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:07:53,641 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 1025 proven. 144 refuted. 0 times theorem prover too weak. 1640 trivial. 0 not checked. [2021-05-02 13:07:53,641 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50429021] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:07:53,641 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:07:53,641 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 15] total 58 [2021-05-02 13:07:53,641 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411958967] [2021-05-02 13:07:53,642 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 13:07:53,642 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:07:53,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 13:07:53,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=2942, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:07:53,643 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 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 13:07:59,146 WARN L205 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 13:08:00,065 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 13:08:01,128 WARN L205 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 13:08:02,726 WARN L205 SmtUtils]: Spent 174.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 13:08:05,134 WARN L205 SmtUtils]: Spent 357.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 13:08:08,540 WARN L205 SmtUtils]: Spent 455.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 13:08:11,305 WARN L205 SmtUtils]: Spent 400.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 13:08:13,501 WARN L205 SmtUtils]: Spent 479.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 13:08:14,816 WARN L205 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 13:08:16,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:08:16,368 INFO L93 Difference]: Finished difference Result 156 states and 164 transitions. [2021-05-02 13:08:16,369 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 13:08:16,369 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 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 117 [2021-05-02 13:08:16,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:08:16,370 INFO L225 Difference]: With dead ends: 156 [2021-05-02 13:08:16,370 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 13:08:16,371 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 114 SyntacticMatches, 5 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1645 ImplicationChecksByTransitivity, 22306.2ms TimeCoverageRelationStatistics Valid=1013, Invalid=11869, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 13:08:16,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 13:08:16,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2021-05-02 13:08:16,381 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 13:08:16,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 125 transitions. [2021-05-02 13:08:16,381 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 125 transitions. Word has length 117 [2021-05-02 13:08:16,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:08:16,382 INFO L480 AbstractCegarLoop]: Abstraction has 123 states and 125 transitions. [2021-05-02 13:08:16,382 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.1206896551724137) internal successors, (123), 57 states have internal predecessors, (123), 2 states have call successors, (4), 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 13:08:16,382 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 125 transitions. [2021-05-02 13:08:16,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-05-02 13:08:16,382 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:08:16,382 INFO L523 BasicCegarLoop]: trace histogram [55, 42, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:08:16,587 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:08:16,587 INFO L428 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:08:16,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:08:16,588 INFO L82 PathProgramCache]: Analyzing trace with hash 753175460, now seen corresponding path program 40 times [2021-05-02 13:08:16,588 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:08:16,588 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056120738] [2021-05-02 13:08:16,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:08:16,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:08:17,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:08:17,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:08:17,827 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 13:08:17,827 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:08:17,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056120738] [2021-05-02 13:08:17,828 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2056120738] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:08:17,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805789874] [2021-05-02 13:08:17,828 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 13:08:17,887 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:08:17,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:08:17,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 88 conjunts are in the unsatisfiable core [2021-05-02 13:08:17,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:08:18,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:08:18,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:08:18,250 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 1075 proven. 1806 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 13:08:18,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805789874] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:08:18,250 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:08:18,250 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 13:08:18,250 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839449115] [2021-05-02 13:08:18,251 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:08:18,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:08:18,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:08:18,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:08:18,251 INFO L87 Difference]: Start difference. First operand 123 states and 125 transitions. Second operand has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 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 13:08:23,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:08:23,018 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2021-05-02 13:08:23,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 13:08:23,020 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 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 121 [2021-05-02 13:08:23,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:08:23,021 INFO L225 Difference]: With dead ends: 158 [2021-05-02 13:08:23,021 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 13:08:23,022 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 908 ImplicationChecksByTransitivity, 3548.0ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 13:08:23,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 13:08:23,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2021-05-02 13:08:23,032 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 13:08:23,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 127 transitions. [2021-05-02 13:08:23,033 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 127 transitions. Word has length 121 [2021-05-02 13:08:23,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:08:23,033 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 127 transitions. [2021-05-02 13:08:23,033 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 2.106382978723404) internal successors, (99), 46 states have internal predecessors, (99), 2 states have call successors, (4), 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 13:08:23,033 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 127 transitions. [2021-05-02 13:08:23,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-02 13:08:23,034 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:08:23,034 INFO L523 BasicCegarLoop]: trace histogram [56, 43, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:08:23,248 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:08:23,249 INFO L428 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:08:23,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:08:23,249 INFO L82 PathProgramCache]: Analyzing trace with hash -1219577791, now seen corresponding path program 41 times [2021-05-02 13:08:23,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:08:23,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944612595] [2021-05-02 13:08:23,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:08:23,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:08:25,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:08:25,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:08:25,373 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 1100 proven. 1892 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 13:08:25,373 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:08:25,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944612595] [2021-05-02 13:08:25,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944612595] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:08:25,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861708744] [2021-05-02 13:08:25,374 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 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 13:09:05,815 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 57 check-sat command(s) [2021-05-02 13:09:05,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:09:05,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 309 conjuncts, 134 conjunts are in the unsatisfiable core [2021-05-02 13:09:05,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:09:07,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:09:07,746 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:09:07,778 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 893 proven. 2162 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 13:09:07,779 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1861708744] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:09:07,779 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:09:07,779 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 49] total 51 [2021-05-02 13:09:07,779 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366681777] [2021-05-02 13:09:07,779 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 13:09:07,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:09:07,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 13:09:07,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2407, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:09:07,780 INFO L87 Difference]: Start difference. First operand 125 states and 127 transitions. Second operand has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 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 13:09:12,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:09:12,334 INFO L93 Difference]: Finished difference Result 160 states and 165 transitions. [2021-05-02 13:09:12,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 13:09:12,335 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 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 123 [2021-05-02 13:09:12,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:09:12,336 INFO L225 Difference]: With dead ends: 160 [2021-05-02 13:09:12,336 INFO L226 Difference]: Without dead ends: 127 [2021-05-02 13:09:12,337 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 82 SyntacticMatches, 40 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1034 ImplicationChecksByTransitivity, 5841.9ms TimeCoverageRelationStatistics Valid=363, Invalid=8567, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 13:09:12,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-05-02 13:09:12,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-05-02 13:09:12,348 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 13:09:12,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 129 transitions. [2021-05-02 13:09:12,349 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 129 transitions. Word has length 123 [2021-05-02 13:09:12,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:09:12,349 INFO L480 AbstractCegarLoop]: Abstraction has 127 states and 129 transitions. [2021-05-02 13:09:12,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 2.0980392156862746) internal successors, (107), 50 states have internal predecessors, (107), 2 states have call successors, (4), 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 13:09:12,349 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 129 transitions. [2021-05-02 13:09:12,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-05-02 13:09:12,349 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:09:12,350 INFO L523 BasicCegarLoop]: trace histogram [57, 44, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:09:12,550 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 13:09:12,550 INFO L428 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:09:12,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:09:12,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1340092830, now seen corresponding path program 42 times [2021-05-02 13:09:12,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:09:12,551 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400352654] [2021-05-02 13:09:12,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:09:12,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:09:14,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:09:14,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:09:14,179 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1125 proven. 1980 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 13:09:14,179 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:09:14,179 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [400352654] [2021-05-02 13:09:14,179 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [400352654] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:09:14,179 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1835918108] [2021-05-02 13:09:14,179 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 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 13:09:27,132 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2021-05-02 13:09:27,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:09:27,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 13:09:27,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:09:27,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:09:27,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:09:29,562 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:09:29,577 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 1215 proven. 226 refuted. 0 times theorem prover too weak. 1808 trivial. 0 not checked. [2021-05-02 13:09:29,577 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1835918108] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:09:29,577 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:09:29,577 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 16] total 62 [2021-05-02 13:09:29,577 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672064956] [2021-05-02 13:09:29,578 INFO L460 AbstractCegarLoop]: Interpolant automaton has 62 states [2021-05-02 13:09:29,578 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:09:29,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2021-05-02 13:09:29,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=549, Invalid=3233, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 13:09:29,579 INFO L87 Difference]: Start difference. First operand 127 states and 129 transitions. Second operand has 62 states, 62 states have (on average 2.129032258064516) internal successors, (132), 61 states have internal predecessors, (132), 2 states have call successors, (4), 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 13:09:37,316 WARN L205 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 45 [2021-05-02 13:09:39,574 WARN L205 SmtUtils]: Spent 446.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 13:09:44,247 WARN L205 SmtUtils]: Spent 588.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 13:09:49,379 WARN L205 SmtUtils]: Spent 597.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 13:09:54,955 WARN L205 SmtUtils]: Spent 831.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 13:10:04,768 WARN L205 SmtUtils]: Spent 424.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 42 [2021-05-02 13:10:08,159 WARN L205 SmtUtils]: Spent 406.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 42 [2021-05-02 13:10:11,825 WARN L205 SmtUtils]: Spent 598.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 13:10:14,748 WARN L205 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 13:10:16,831 WARN L205 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 13:10:19,161 WARN L205 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 13:10:20,815 WARN L205 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:10:21,882 WARN L205 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 42 [2021-05-02 13:10:22,814 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2021-05-02 13:10:23,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:10:23,728 INFO L93 Difference]: Finished difference Result 166 states and 174 transitions. [2021-05-02 13:10:23,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-05-02 13:10:23,730 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 2.129032258064516) internal successors, (132), 61 states have internal predecessors, (132), 2 states have call successors, (4), 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 125 [2021-05-02 13:10:23,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:10:23,731 INFO L225 Difference]: With dead ends: 166 [2021-05-02 13:10:23,731 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 13:10:23,732 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 124 SyntacticMatches, 3 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1948 ImplicationChecksByTransitivity, 53676.4ms TimeCoverageRelationStatistics Valid=1471, Invalid=13291, Unknown=0, NotChecked=0, Total=14762 [2021-05-02 13:10:23,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 13:10:23,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 131. [2021-05-02 13:10:23,743 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 13:10:23,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2021-05-02 13:10:23,744 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 125 [2021-05-02 13:10:23,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:10:23,744 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2021-05-02 13:10:23,744 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 62 states, 62 states have (on average 2.129032258064516) internal successors, (132), 61 states have internal predecessors, (132), 2 states have call successors, (4), 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 13:10:23,744 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2021-05-02 13:10:23,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-05-02 13:10:23,745 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:10:23,745 INFO L523 BasicCegarLoop]: trace histogram [59, 45, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:10:23,953 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-05-02 13:10:23,953 INFO L428 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:10:23,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:10:23,954 INFO L82 PathProgramCache]: Analyzing trace with hash -1331377578, now seen corresponding path program 43 times [2021-05-02 13:10:23,954 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:10:23,954 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177803950] [2021-05-02 13:10:23,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:10:23,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:10:26,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:10:26,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:10:26,772 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 13:10:26,772 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:10:26,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177803950] [2021-05-02 13:10:26,772 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [177803950] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:10:26,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [218488337] [2021-05-02 13:10:26,772 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 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 13:10:26,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:10:26,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 94 conjunts are in the unsatisfiable core [2021-05-02 13:10:26,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:10:27,469 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:10:27,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:10:27,550 INFO L134 CoverageAnalysis]: Checked inductivity of 3481 backedges. 1242 proven. 2070 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 13:10:27,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [218488337] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:10:27,551 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:10:27,551 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 13:10:27,551 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129890286] [2021-05-02 13:10:27,551 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 13:10:27,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:10:27,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 13:10:27,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 13:10:27,552 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 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 13:10:36,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:10:36,884 INFO L93 Difference]: Finished difference Result 168 states and 173 transitions. [2021-05-02 13:10:36,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 13:10:36,885 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 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 129 [2021-05-02 13:10:36,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:10:36,886 INFO L225 Difference]: With dead ends: 168 [2021-05-02 13:10:36,886 INFO L226 Difference]: Without dead ends: 133 [2021-05-02 13:10:36,887 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1040 ImplicationChecksByTransitivity, 6938.2ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 13:10:36,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2021-05-02 13:10:36,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2021-05-02 13:10:36,906 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 13:10:36,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-02 13:10:36,907 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 129 [2021-05-02 13:10:36,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:10:36,907 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-02 13:10:36,907 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 2.1) internal successors, (105), 49 states have internal predecessors, (105), 2 states have call successors, (4), 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 13:10:36,907 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-02 13:10:36,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 13:10:36,908 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:10:36,908 INFO L523 BasicCegarLoop]: trace histogram [60, 46, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:10:37,108 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-05-02 13:10:37,108 INFO L428 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:10:37,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:10:37,109 INFO L82 PathProgramCache]: Analyzing trace with hash -501544461, now seen corresponding path program 44 times [2021-05-02 13:10:37,109 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:10:37,109 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507940013] [2021-05-02 13:10:37,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:10:37,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:10:38,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:10:38,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:10:38,992 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 1269 proven. 2162 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 13:10:38,992 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:10:38,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507940013] [2021-05-02 13:10:38,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [507940013] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:10:38,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [743315219] [2021-05-02 13:10:38,992 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 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 13:10:39,062 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:10:39,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:10:39,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 123 conjunts are in the unsatisfiable core [2021-05-02 13:10:39,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:10:40,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:10:40,425 INFO L134 CoverageAnalysis]: Checked inductivity of 3600 backedges. 0 proven. 3600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:10:40,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [743315219] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:10:40,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:10:40,425 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 63] total 65 [2021-05-02 13:10:40,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392658973] [2021-05-02 13:10:40,426 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 13:10:40,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:10:40,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 13:10:40,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=3986, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 13:10:40,426 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 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 13:10:47,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:10:47,901 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2021-05-02 13:10:47,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 13:10:47,902 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-02 13:10:47,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:10:47,903 INFO L225 Difference]: With dead ends: 170 [2021-05-02 13:10:47,903 INFO L226 Difference]: Without dead ends: 135 [2021-05-02 13:10:47,904 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1113 ImplicationChecksByTransitivity, 5961.6ms TimeCoverageRelationStatistics Valid=409, Invalid=12023, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 13:10:47,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-02 13:10:47,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2021-05-02 13:10:47,915 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 13:10:47,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 137 transitions. [2021-05-02 13:10:47,915 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 137 transitions. Word has length 131 [2021-05-02 13:10:47,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:10:47,916 INFO L480 AbstractCegarLoop]: Abstraction has 135 states and 137 transitions. [2021-05-02 13:10:47,916 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 2.0615384615384613) internal successors, (134), 64 states have internal predecessors, (134), 2 states have call successors, (4), 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 13:10:47,916 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 137 transitions. [2021-05-02 13:10:47,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-05-02 13:10:47,916 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:10:47,916 INFO L523 BasicCegarLoop]: trace histogram [61, 47, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:10:48,132 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:10:48,133 INFO L428 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:10:48,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:10:48,133 INFO L82 PathProgramCache]: Analyzing trace with hash -1895836080, now seen corresponding path program 45 times [2021-05-02 13:10:48,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:10:48,134 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484800977] [2021-05-02 13:10:48,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:10:48,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:10:50,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:10:50,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:10:50,047 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1296 proven. 2256 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2021-05-02 13:10:50,047 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:10:50,047 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484800977] [2021-05-02 13:10:50,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1484800977] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:10:50,047 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [552932072] [2021-05-02 13:10:50,047 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 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 13:10:50,667 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-05-02 13:10:50,667 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:10:50,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 13:10:50,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:10:56,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:10:56,205 INFO L134 CoverageAnalysis]: Checked inductivity of 3721 backedges. 1363 proven. 196 refuted. 0 times theorem prover too weak. 2162 trivial. 0 not checked. [2021-05-02 13:10:56,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [552932072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:10:56,205 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:10:56,205 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 17] total 66 [2021-05-02 13:10:56,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581037981] [2021-05-02 13:10:56,206 INFO L460 AbstractCegarLoop]: Interpolant automaton has 66 states [2021-05-02 13:10:56,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:10:56,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-05-02 13:10:56,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=386, Invalid=3904, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:10:56,207 INFO L87 Difference]: Start difference. First operand 135 states and 137 transitions. Second operand has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:11:05,790 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:11:06,842 WARN L205 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 42 [2021-05-02 13:11:08,160 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 13:11:09,824 WARN L205 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 42 [2021-05-02 13:11:12,013 WARN L205 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 13:11:14,816 WARN L205 SmtUtils]: Spent 401.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 13:11:18,591 WARN L205 SmtUtils]: Spent 757.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 13:11:23,654 WARN L205 SmtUtils]: Spent 537.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 13:11:28,774 WARN L205 SmtUtils]: Spent 711.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 13:11:34,218 WARN L205 SmtUtils]: Spent 521.00 ms on a formula simplification. DAG size of input: 74 DAG size of output: 42 [2021-05-02 13:11:38,527 WARN L205 SmtUtils]: Spent 410.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2021-05-02 13:11:40,729 WARN L205 SmtUtils]: Spent 365.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:11:41,963 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2021-05-02 13:11:43,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:11:43,178 INFO L93 Difference]: Finished difference Result 176 states and 184 transitions. [2021-05-02 13:11:43,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2021-05-02 13:11:43,181 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 133 [2021-05-02 13:11:43,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:11:43,182 INFO L225 Difference]: With dead ends: 176 [2021-05-02 13:11:43,182 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 13:11:43,183 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 126 SyntacticMatches, 9 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2145 ImplicationChecksByTransitivity, 47391.1ms TimeCoverageRelationStatistics Valid=1089, Invalid=15681, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 13:11:43,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 13:11:43,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 139. [2021-05-02 13:11:43,208 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 13:11:43,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-02 13:11:43,215 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 133 [2021-05-02 13:11:43,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:11:43,215 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-02 13:11:43,215 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 66 states, 66 states have (on average 2.106060606060606) internal successors, (139), 65 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:11:43,215 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-02 13:11:43,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 13:11:43,216 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:11:43,216 INFO L523 BasicCegarLoop]: trace histogram [63, 48, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:11:43,422 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-02 13:11:43,422 INFO L428 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:11:43,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:11:43,422 INFO L82 PathProgramCache]: Analyzing trace with hash -354427512, now seen corresponding path program 46 times [2021-05-02 13:11:43,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:11:43,423 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1145561527] [2021-05-02 13:11:43,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:11:43,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:11:48,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:11:48,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:11:48,085 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 13:11:48,085 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:11:48,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1145561527] [2021-05-02 13:11:48,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1145561527] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:11:48,086 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208652869] [2021-05-02 13:11:48,086 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 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 13:11:48,157 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:11:48,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:11:48,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 100 conjunts are in the unsatisfiable core [2021-05-02 13:11:48,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:11:49,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:11:49,416 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:11:49,608 INFO L134 CoverageAnalysis]: Checked inductivity of 3969 backedges. 1421 proven. 2352 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 13:11:49,608 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [208652869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:11:49,608 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:11:49,608 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 51] total 53 [2021-05-02 13:11:49,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729790816] [2021-05-02 13:11:49,609 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 13:11:49,609 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:11:49,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 13:11:49,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=2604, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 13:11:49,610 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 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 13:12:06,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:12:06,891 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2021-05-02 13:12:06,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 13:12:06,896 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 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 137 [2021-05-02 13:12:06,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:12:06,897 INFO L225 Difference]: With dead ends: 178 [2021-05-02 13:12:06,897 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 13:12:06,898 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 137 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1181 ImplicationChecksByTransitivity, 11746.1ms TimeCoverageRelationStatistics Valid=397, Invalid=9905, Unknown=0, NotChecked=0, Total=10302 [2021-05-02 13:12:06,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 13:12:06,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2021-05-02 13:12:06,911 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 13:12:06,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-05-02 13:12:06,912 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 137 [2021-05-02 13:12:06,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:12:06,912 INFO L480 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-05-02 13:12:06,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 2 states have call successors, (4), 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 13:12:06,912 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-05-02 13:12:06,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-05-02 13:12:06,913 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:12:06,913 INFO L523 BasicCegarLoop]: trace histogram [64, 49, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:12:07,134 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:12:07,135 INFO L428 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:12:07,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:12:07,135 INFO L82 PathProgramCache]: Analyzing trace with hash 194981925, now seen corresponding path program 47 times [2021-05-02 13:12:07,135 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:12:07,135 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269546515] [2021-05-02 13:12:07,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:12:07,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:12:12,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:12:12,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:12:12,281 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1450 proven. 2450 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 13:12:12,281 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:12:12,281 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269546515] [2021-05-02 13:12:12,281 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [269546515] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:12:12,281 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [346740038] [2021-05-02 13:12:12,281 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 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 13:13:14,081 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 65 check-sat command(s) [2021-05-02 13:13:14,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:13:14,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 115 conjunts are in the unsatisfiable core [2021-05-02 13:13:14,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:13:16,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:13:16,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:13:16,365 INFO L134 CoverageAnalysis]: Checked inductivity of 4096 backedges. 1045 proven. 2970 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 13:13:16,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [346740038] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:13:16,366 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:13:16,366 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 57] total 59 [2021-05-02 13:13:16,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414157176] [2021-05-02 13:13:16,367 INFO L460 AbstractCegarLoop]: Interpolant automaton has 59 states [2021-05-02 13:13:16,367 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:13:16,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-05-02 13:13:16,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=3257, Unknown=0, NotChecked=0, Total=3422 [2021-05-02 13:13:16,367 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 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 13:13:30,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:13:30,610 INFO L93 Difference]: Finished difference Result 180 states and 185 transitions. [2021-05-02 13:13:30,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 13:13:30,612 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 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 139 [2021-05-02 13:13:30,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:13:30,613 INFO L225 Difference]: With dead ends: 180 [2021-05-02 13:13:30,613 INFO L226 Difference]: Without dead ends: 143 [2021-05-02 13:13:30,614 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 131 SyntacticMatches, 5 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 11832.4ms TimeCoverageRelationStatistics Valid=415, Invalid=11357, Unknown=0, NotChecked=0, Total=11772 [2021-05-02 13:13:30,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-05-02 13:13:30,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2021-05-02 13:13:30,627 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 13:13:30,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-05-02 13:13:30,627 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 139 [2021-05-02 13:13:30,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:13:30,628 INFO L480 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-05-02 13:13:30,628 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 59 states, 59 states have (on average 2.0847457627118646) internal successors, (123), 58 states have internal predecessors, (123), 2 states have call successors, (4), 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 13:13:30,628 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-05-02 13:13:30,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-02 13:13:30,628 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:13:30,628 INFO L523 BasicCegarLoop]: trace histogram [65, 50, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:13:30,838 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,51 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:13:30,838 INFO L428 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:13:30,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:13:30,838 INFO L82 PathProgramCache]: Analyzing trace with hash -103526526, now seen corresponding path program 48 times [2021-05-02 13:13:30,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:13:30,839 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491577310] [2021-05-02 13:13:30,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:13:30,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:13:34,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:13:34,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:13:34,444 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1479 proven. 2550 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2021-05-02 13:13:34,444 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:13:34,444 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491577310] [2021-05-02 13:13:34,444 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491577310] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:13:34,444 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1957351037] [2021-05-02 13:13:34,444 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 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 13:13:54,858 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 63 check-sat command(s) [2021-05-02 13:13:54,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:13:54,873 WARN L261 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 180 conjunts are in the unsatisfiable core [2021-05-02 13:13:54,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:13:55,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:13:55,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:13:57,876 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2021-05-02 13:14:13,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:14:13,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:14:13,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:14:13,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:14:38,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:14:38,265 INFO L134 CoverageAnalysis]: Checked inductivity of 4225 backedges. 1459 proven. 2643 refuted. 0 times theorem prover too weak. 123 trivial. 0 not checked. [2021-05-02 13:14:38,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1957351037] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:14:38,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:14:38,266 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 56] total 97 [2021-05-02 13:14:38,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299682488] [2021-05-02 13:14:38,266 INFO L460 AbstractCegarLoop]: Interpolant automaton has 97 states [2021-05-02 13:14:38,267 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:14:38,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-05-02 13:14:38,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1797, Invalid=7515, Unknown=0, NotChecked=0, Total=9312 [2021-05-02 13:14:38,268 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 97 states, 97 states have (on average 2.082474226804124) internal successors, (202), 96 states have internal predecessors, (202), 2 states have call successors, (4), 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 13:15:03,313 WARN L205 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 45 [2021-05-02 13:15:04,780 WARN L205 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2021-05-02 13:15:06,190 WARN L205 SmtUtils]: Spent 307.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 42 [2021-05-02 13:15:08,016 WARN L205 SmtUtils]: Spent 340.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:15:09,988 WARN L205 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:15:11,725 WARN L205 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:15:13,924 WARN L205 SmtUtils]: Spent 312.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:15:16,003 WARN L205 SmtUtils]: Spent 315.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:15:19,574 WARN L205 SmtUtils]: Spent 478.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:15:23,181 WARN L205 SmtUtils]: Spent 338.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:15:26,699 WARN L205 SmtUtils]: Spent 343.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:15:30,161 WARN L205 SmtUtils]: Spent 295.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:15:32,913 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:15:35,533 WARN L205 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 42 [2021-05-02 13:15:37,273 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 42 [2021-05-02 13:15:51,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:51,214 INFO L93 Difference]: Finished difference Result 237 states and 271 transitions. [2021-05-02 13:15:51,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-05-02 13:15:51,214 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 2.082474226804124) internal successors, (202), 96 states have internal predecessors, (202), 2 states have call successors, (4), 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 141 [2021-05-02 13:15:51,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:51,215 INFO L225 Difference]: With dead ends: 237 [2021-05-02 13:15:51,215 INFO L226 Difference]: Without dead ends: 200 [2021-05-02 13:15:51,216 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 92 SyntacticMatches, 26 SemanticMatches, 189 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7164 ImplicationChecksByTransitivity, 98090.0ms TimeCoverageRelationStatistics Valid=5304, Invalid=30986, Unknown=0, NotChecked=0, Total=36290 [2021-05-02 13:15:51,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-05-02 13:15:51,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 148. [2021-05-02 13:15:51,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.020979020979021) internal successors, (146), 143 states have internal predecessors, (146), 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 13:15:51,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2021-05-02 13:15:51,230 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 141 [2021-05-02 13:15:51,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:51,231 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2021-05-02 13:15:51,231 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 97 states, 97 states have (on average 2.082474226804124) internal successors, (202), 96 states have internal predecessors, (202), 2 states have call successors, (4), 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 13:15:51,231 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2021-05-02 13:15:51,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-05-02 13:15:51,231 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:51,231 INFO L523 BasicCegarLoop]: trace histogram [68, 51, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:51,439 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-05-02 13:15:51,440 INFO L428 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:51,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:51,440 INFO L82 PathProgramCache]: Analyzing trace with hash 726942741, now seen corresponding path program 49 times [2021-05-02 13:15:51,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:51,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934160577] [2021-05-02 13:15:51,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:51,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:55,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:55,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:55,667 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 1716 proven. 2652 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 13:15:55,667 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:55,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934160577] [2021-05-02 13:15:55,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1934160577] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:55,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170833892] [2021-05-02 13:15:55,668 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 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 13:15:55,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:55,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 106 conjunts are in the unsatisfiable core [2021-05-02 13:15:55,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:56,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:56,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:57,002 INFO L134 CoverageAnalysis]: Checked inductivity of 4624 backedges. 1716 proven. 2652 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 13:15:57,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170833892] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:57,003 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:57,003 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54] total 56 [2021-05-02 13:15:57,003 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895333091] [2021-05-02 13:15:57,003 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 13:15:57,003 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:57,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 13:15:57,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2919, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:15:57,004 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 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 13:16:09,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:09,562 INFO L93 Difference]: Finished difference Result 190 states and 195 transitions. [2021-05-02 13:16:09,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 13:16:09,564 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 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 147 [2021-05-02 13:16:09,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:09,565 INFO L225 Difference]: With dead ends: 190 [2021-05-02 13:16:09,565 INFO L226 Difference]: Without dead ends: 150 [2021-05-02 13:16:09,565 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 147 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 9448.0ms TimeCoverageRelationStatistics Valid=421, Invalid=11135, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 13:16:09,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2021-05-02 13:16:09,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 150. [2021-05-02 13:16:09,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 145 states have (on average 1.0206896551724138) internal successors, (148), 145 states have internal predecessors, (148), 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 13:16:09,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 152 transitions. [2021-05-02 13:16:09,580 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 152 transitions. Word has length 147 [2021-05-02 13:16:09,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:09,580 INFO L480 AbstractCegarLoop]: Abstraction has 150 states and 152 transitions. [2021-05-02 13:16:09,580 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.0892857142857144) internal successors, (117), 55 states have internal predecessors, (117), 2 states have call successors, (4), 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 13:16:09,580 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 152 transitions. [2021-05-02 13:16:09,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-02 13:16:09,581 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:09,581 INFO L523 BasicCegarLoop]: trace histogram [69, 52, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:09,796 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:09,796 INFO L428 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:09,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:09,797 INFO L82 PathProgramCache]: Analyzing trace with hash 987149938, now seen corresponding path program 50 times [2021-05-02 13:16:09,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:09,797 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1256540615] [2021-05-02 13:16:09,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:09,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:13,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:13,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:13,092 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 1749 proven. 2756 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 13:16:13,092 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:13,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1256540615] [2021-05-02 13:16:13,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1256540615] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:13,092 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380485284] [2021-05-02 13:16:13,092 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 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 13:16:13,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:13,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:13,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 361 conjuncts, 141 conjunts are in the unsatisfiable core [2021-05-02 13:16:13,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:16,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:16,064 INFO L134 CoverageAnalysis]: Checked inductivity of 4761 backedges. 0 proven. 4761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:16:16,065 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380485284] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:16,065 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:16,065 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 72] total 74 [2021-05-02 13:16:16,065 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329313904] [2021-05-02 13:16:16,065 INFO L460 AbstractCegarLoop]: Interpolant automaton has 74 states [2021-05-02 13:16:16,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:16,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2021-05-02 13:16:16,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=5204, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 13:16:16,066 INFO L87 Difference]: Start difference. First operand 150 states and 152 transitions. Second operand has 74 states, 74 states have (on average 2.054054054054054) internal successors, (152), 73 states have internal predecessors, (152), 2 states have call successors, (4), 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 13:16:31,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:31,470 INFO L93 Difference]: Finished difference Result 192 states and 197 transitions. [2021-05-02 13:16:31,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 13:16:31,473 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.054054054054054) internal successors, (152), 73 states have internal predecessors, (152), 2 states have call successors, (4), 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 149 [2021-05-02 13:16:31,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:31,474 INFO L225 Difference]: With dead ends: 192 [2021-05-02 13:16:31,474 INFO L226 Difference]: Without dead ends: 152 [2021-05-02 13:16:31,475 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1416 ImplicationChecksByTransitivity, 11049.1ms TimeCoverageRelationStatistics Valid=463, Invalid=15539, Unknown=0, NotChecked=0, Total=16002 [2021-05-02 13:16:31,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-02 13:16:31,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2021-05-02 13:16:31,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 147 states have (on average 1.0204081632653061) internal successors, (150), 147 states have internal predecessors, (150), 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 13:16:31,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 154 transitions. [2021-05-02 13:16:31,488 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 154 transitions. Word has length 149 [2021-05-02 13:16:31,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:31,489 INFO L480 AbstractCegarLoop]: Abstraction has 152 states and 154 transitions. [2021-05-02 13:16:31,489 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 74 states, 74 states have (on average 2.054054054054054) internal successors, (152), 73 states have internal predecessors, (152), 2 states have call successors, (4), 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 13:16:31,489 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 154 transitions. [2021-05-02 13:16:31,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-05-02 13:16:31,489 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:31,489 INFO L523 BasicCegarLoop]: trace histogram [70, 53, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:31,705 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-02 13:16:31,705 INFO L428 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:31,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:31,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1938163087, now seen corresponding path program 51 times [2021-05-02 13:16:31,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:31,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475997277] [2021-05-02 13:16:31,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:31,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:35,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:35,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:35,846 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1782 proven. 2862 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2021-05-02 13:16:35,846 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:35,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475997277] [2021-05-02 13:16:35,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1475997277] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:35,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1265013667] [2021-05-02 13:16:35,846 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 13:16:36,525 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 36 check-sat command(s) [2021-05-02 13:16:36,525 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:36,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 13:16:36,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:36,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:44,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:44,969 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1855 proven. 289 refuted. 0 times theorem prover too weak. 2756 trivial. 0 not checked. [2021-05-02 13:16:44,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1265013667] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:44,970 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:44,970 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 20] total 75 [2021-05-02 13:16:44,970 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944270440] [2021-05-02 13:16:44,970 INFO L460 AbstractCegarLoop]: Interpolant automaton has 75 states [2021-05-02 13:16:44,970 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:44,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2021-05-02 13:16:44,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=720, Invalid=4830, Unknown=0, NotChecked=0, Total=5550 [2021-05-02 13:16:44,971 INFO L87 Difference]: Start difference. First operand 152 states and 154 transitions. Second operand has 75 states, 75 states have (on average 2.0933333333333333) internal successors, (157), 74 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:17:03,280 WARN L205 SmtUtils]: Spent 357.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 45 [2021-05-02 13:17:07,720 WARN L205 SmtUtils]: Spent 669.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 42 [2021-05-02 13:17:15,204 WARN L205 SmtUtils]: Spent 1.11 s on a formula simplification. DAG size of input: 90 DAG size of output: 42 [2021-05-02 13:17:24,924 WARN L205 SmtUtils]: Spent 980.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 42 [2021-05-02 13:17:39,447 WARN L205 SmtUtils]: Spent 1.57 s on a formula simplification. DAG size of input: 98 DAG size of output: 42 [2021-05-02 13:17:57,011 WARN L205 SmtUtils]: Spent 2.04 s on a formula simplification. DAG size of input: 102 DAG size of output: 42 [2021-05-02 13:18:19,140 WARN L205 SmtUtils]: Spent 3.01 s on a formula simplification. DAG size of input: 106 DAG size of output: 42 [2021-05-02 13:18:40,125 WARN L205 SmtUtils]: Spent 1.94 s on a formula simplification. DAG size of input: 102 DAG size of output: 42 [2021-05-02 13:18:58,882 WARN L205 SmtUtils]: Spent 1.61 s on a formula simplification. DAG size of input: 98 DAG size of output: 42 [2021-05-02 13:19:17,042 WARN L205 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 94 DAG size of output: 42