/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_8.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:15:05,357 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:15:05,360 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:15:05,403 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:15:05,434 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:15:05,435 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:15:05,437 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:15:05,438 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:15:05,439 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:15:05,440 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:15:05,446 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:15:05,449 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:15:05,451 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:15:05,459 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:15:05,461 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:15:05,462 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:15:05,465 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:15:05,491 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:15:05,492 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:15:05,495 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:15:05,501 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 13:15:05,555 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:15:05,555 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:15:05,561 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:15:05,562 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:15:05,562 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:15:05,562 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:15:05,562 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:15:05,562 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:15:05,562 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:15:05,563 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:15:05,564 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:15:05,564 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:15:05,564 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:15:05,565 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:15:05,565 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:15:05,565 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:15:05,565 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:15:05,565 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:15:05,566 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:15:05,566 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:15:05,566 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:15:05,566 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:15:05,566 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:15:05,566 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:15:05,566 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:15:05,567 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:15:05,567 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:15:05,567 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:15:05,567 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:15:05,985 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:15:06,011 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:15:06,014 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:15:06,016 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:15:06,020 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:15:06,021 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c [2021-05-02 13:15:06,123 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bbc72b0a5/1d4283c96c5f4aadb5ec2721e84fbbaf/FLAG8362dcaf7 [2021-05-02 13:15:06,817 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:15:06,818 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_8.c [2021-05-02 13:15:06,828 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bbc72b0a5/1d4283c96c5f4aadb5ec2721e84fbbaf/FLAG8362dcaf7 [2021-05-02 13:15:07,206 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bbc72b0a5/1d4283c96c5f4aadb5ec2721e84fbbaf [2021-05-02 13:15:07,219 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:15:07,222 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:15:07,228 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:15:07,229 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:15:07,233 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:15:07,235 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:15:07" (1/1) ... [2021-05-02 13:15:07,237 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6df175ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:07, skipping insertion in model container [2021-05-02 13:15:07,238 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:15:07" (1/1) ... [2021-05-02 13:15:07,248 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:15:07,269 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:15:07,470 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_8.c[318,331] [2021-05-02 13:15:07,491 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:15:07,504 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:15:07,520 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_8.c[318,331] [2021-05-02 13:15:07,530 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:15:07,552 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:15:07,553 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:07 WrapperNode [2021-05-02 13:15:07,553 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:15:07,557 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:15:07,557 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:15:07,560 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:15:07,573 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:07" (1/1) ... [2021-05-02 13:15:07,575 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:07" (1/1) ... [2021-05-02 13:15:07,584 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:07" (1/1) ... [2021-05-02 13:15:07,585 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:07" (1/1) ... [2021-05-02 13:15:07,591 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:07" (1/1) ... [2021-05-02 13:15:07,595 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:07" (1/1) ... [2021-05-02 13:15:07,597 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:07" (1/1) ... [2021-05-02 13:15:07,599 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:15:07,600 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:15:07,601 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:15:07,629 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:15:07,657 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:07" (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 13:15:07,768 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:15:07,769 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:15:07,770 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:15:07,770 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:15:07,770 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:15:07,770 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:15:07,770 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:15:07,771 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:15:07,771 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:15:07,771 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:15:07,771 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:15:07,771 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:15:07,772 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:15:07,772 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:15:07,773 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:15:07,773 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:15:07,773 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:15:08,097 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:15:08,097 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 13:15:08,099 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:15:08 BoogieIcfgContainer [2021-05-02 13:15:08,099 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:15:08,118 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:15:08,118 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:15:08,122 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:15:08,123 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:15:07" (1/3) ... [2021-05-02 13:15:08,124 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41dcfdb7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:15:08, skipping insertion in model container [2021-05-02 13:15:08,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:07" (2/3) ... [2021-05-02 13:15:08,124 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41dcfdb7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:15:08, skipping insertion in model container [2021-05-02 13:15:08,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:15:08" (3/3) ... [2021-05-02 13:15:08,126 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_8.c [2021-05-02 13:15:08,134 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:15:08,156 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:15:08,188 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:15:08,238 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:15:08,238 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:15:08,239 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:15:08,239 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:15:08,239 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:15:08,239 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:15:08,239 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:15:08,239 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:15:08,265 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 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 13:15:08,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:15:08,272 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:08,273 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:08,274 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:08,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:08,284 INFO L82 PathProgramCache]: Analyzing trace with hash -2135496849, now seen corresponding path program 1 times [2021-05-02 13:15:08,295 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:08,295 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67534346] [2021-05-02 13:15:08,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:08,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:08,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:08,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:08,726 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 13:15:08,727 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:08,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67534346] [2021-05-02 13:15:08,728 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [67534346] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:15:08,728 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:15:08,729 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:15:08,729 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537719834] [2021-05-02 13:15:08,735 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:15:08,736 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:08,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:15:08,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:15:08,762 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 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 13:15:08,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:08,870 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-05-02 13:15:08,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:15:08,874 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 13:15:08,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:08,881 INFO L225 Difference]: With dead ends: 33 [2021-05-02 13:15:08,883 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 13:15:08,889 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 106.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:15:08,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 13:15:08,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 13:15:08,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:08,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 13:15:08,946 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 13:15:08,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:08,946 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 13:15:08,947 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 13:15:08,948 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 13:15:08,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:15:08,950 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:08,950 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:08,951 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:15:08,951 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:08,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:08,952 INFO L82 PathProgramCache]: Analyzing trace with hash -2145655580, now seen corresponding path program 1 times [2021-05-02 13:15:08,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:08,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310810778] [2021-05-02 13:15:08,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:09,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:09,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:09,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:09,259 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 13:15:09,259 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:09,260 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310810778] [2021-05-02 13:15:09,260 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310810778] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:15:09,260 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:15:09,260 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:15:09,261 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181121199] [2021-05-02 13:15:09,262 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:15:09,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:09,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:15:09,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:15:09,264 INFO L87 Difference]: Start difference. First operand 14 states and 15 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 13:15:09,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:09,441 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-05-02 13:15:09,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:15:09,443 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 13:15:09,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:09,446 INFO L225 Difference]: With dead ends: 25 [2021-05-02 13:15:09,447 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 13:15:09,450 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 213.1ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:15:09,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 13:15:09,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 13:15:09,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 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 13:15:09,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 13:15:09,459 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-02 13:15:09,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:09,459 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 13:15:09,460 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 13:15:09,460 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 13:15:09,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 13:15:09,461 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:09,461 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:09,461 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:15:09,462 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:09,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:09,462 INFO L82 PathProgramCache]: Analyzing trace with hash -79339060, now seen corresponding path program 1 times [2021-05-02 13:15:09,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:09,463 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013316020] [2021-05-02 13:15:09,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:09,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:09,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:09,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:09,691 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 13:15:09,691 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:09,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013316020] [2021-05-02 13:15:09,692 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013316020] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:09,692 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658356976] [2021-05-02 13:15:09,692 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 13:15:09,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:09,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:15:09,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:09,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:09,966 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 13:15:09,966 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658356976] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:09,966 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:09,967 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 7 [2021-05-02 13:15:09,967 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015856231] [2021-05-02 13:15:09,968 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:15:09,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:09,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:15:09,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:15:09,970 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:10,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:10,333 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-02 13:15:10,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:15:10,335 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 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 14 [2021-05-02 13:15:10,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:10,336 INFO L225 Difference]: With dead ends: 28 [2021-05-02 13:15:10,336 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 13:15:10,337 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 276.2ms TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:15:10,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 13:15:10,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 13:15:10,346 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 13:15:10,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 13:15:10,347 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 13:15:10,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:10,348 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 13:15:10,348 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:10,348 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 13:15:10,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:15:10,349 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:10,349 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:10,549 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 13:15:10,550 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:10,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:10,551 INFO L82 PathProgramCache]: Analyzing trace with hash 2084821988, now seen corresponding path program 2 times [2021-05-02 13:15:10,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:10,552 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534487760] [2021-05-02 13:15:10,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:10,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:10,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:10,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:10,760 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:10,761 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:10,761 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534487760] [2021-05-02 13:15:10,761 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534487760] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:10,761 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1953121774] [2021-05-02 13:15:10,761 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 13:15:10,840 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:15:10,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:10,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 13:15:10,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:11,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:11,052 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:11,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1953121774] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:11,055 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:11,056 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 9 [2021-05-02 13:15:11,056 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345706465] [2021-05-02 13:15:11,057 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:15:11,057 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:11,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:15:11,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:15:11,059 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:11,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:11,307 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 13:15:11,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:15:11,308 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 13:15:11,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:11,310 INFO L225 Difference]: With dead ends: 31 [2021-05-02 13:15:11,311 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 13:15:11,313 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 251.7ms TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:15:11,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 13:15:11,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 13:15:11,328 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 13:15:11,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 13:15:11,331 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-05-02 13:15:11,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:11,332 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 13:15:11,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:11,333 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 13:15:11,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 13:15:11,334 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:11,335 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:11,541 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:11,542 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:11,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:11,542 INFO L82 PathProgramCache]: Analyzing trace with hash -1442444596, now seen corresponding path program 3 times [2021-05-02 13:15:11,542 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:11,543 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [514537608] [2021-05-02 13:15:11,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:11,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:11,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:11,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:11,814 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:11,814 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:11,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [514537608] [2021-05-02 13:15:11,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [514537608] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:11,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621807083] [2021-05-02 13:15:11,815 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 13:15:11,920 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:15:11,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:11,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-02 13:15:11,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:12,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:12,116 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:15:12,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621807083] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:15:12,117 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:15:12,117 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 11 [2021-05-02 13:15:12,118 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542069040] [2021-05-02 13:15:12,118 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 13:15:12,118 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:12,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 13:15:12,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:15:12,119 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 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 13:15:12,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:12,200 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-05-02 13:15:12,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:15:12,202 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 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 20 [2021-05-02 13:15:12,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:12,203 INFO L225 Difference]: With dead ends: 32 [2021-05-02 13:15:12,203 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 13:15:12,203 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 195.0ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:15:12,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 13:15:12,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2021-05-02 13:15:12,208 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 13:15:12,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-05-02 13:15:12,209 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2021-05-02 13:15:12,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:12,209 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-05-02 13:15:12,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 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 13:15:12,209 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-05-02 13:15:12,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 13:15:12,210 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:12,210 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:12,421 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:12,422 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:12,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:12,423 INFO L82 PathProgramCache]: Analyzing trace with hash 948575330, now seen corresponding path program 1 times [2021-05-02 13:15:12,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:12,423 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033354950] [2021-05-02 13:15:12,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:12,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:12,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:12,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:12,570 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:12,570 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:12,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033354950] [2021-05-02 13:15:12,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033354950] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:12,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795143300] [2021-05-02 13:15:12,571 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 13:15:12,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:12,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 13:15:12,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:12,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:12,745 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 7 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:12,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795143300] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:12,746 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:12,746 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 13:15:12,746 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068027807] [2021-05-02 13:15:12,747 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:15:12,747 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:12,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:15:12,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:15:12,748 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:12,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:12,987 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2021-05-02 13:15:12,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:15:12,987 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 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 13:15:12,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:12,988 INFO L225 Difference]: With dead ends: 38 [2021-05-02 13:15:12,988 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 13:15:12,989 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 191.4ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:15:12,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 13:15:12,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-02 13:15:12,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 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 13:15:12,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2021-05-02 13:15:12,995 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 23 [2021-05-02 13:15:12,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:12,996 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2021-05-02 13:15:12,996 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 7 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:12,996 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2021-05-02 13:15:12,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 13:15:12,997 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:12,997 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:13,209 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:13,210 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:13,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:13,210 INFO L82 PathProgramCache]: Analyzing trace with hash -602440374, now seen corresponding path program 2 times [2021-05-02 13:15:13,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:13,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646886355] [2021-05-02 13:15:13,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:13,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:13,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:13,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:13,334 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:13,335 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:13,335 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646886355] [2021-05-02 13:15:13,335 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1646886355] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:13,335 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [397221086] [2021-05-02 13:15:13,336 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 13:15:13,433 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:15:13,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:13,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 13:15:13,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:13,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:13,592 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:13,593 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [397221086] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:13,593 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:13,593 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 13:15:13,593 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206732559] [2021-05-02 13:15:13,594 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:15:13,594 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:13,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:15:13,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:15:13,595 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:13,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:13,898 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2021-05-02 13:15:13,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:15:13,899 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 26 [2021-05-02 13:15:13,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:13,900 INFO L225 Difference]: With dead ends: 41 [2021-05-02 13:15:13,900 INFO L226 Difference]: Without dead ends: 31 [2021-05-02 13:15:13,901 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 240.6ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:15:13,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-05-02 13:15:13,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2021-05-02 13:15:13,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:13,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-05-02 13:15:13,907 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 26 [2021-05-02 13:15:13,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:13,908 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-05-02 13:15:13,908 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.888888888888889) internal successors, (26), 8 states have internal predecessors, (26), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:13,908 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-05-02 13:15:13,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 13:15:13,909 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:13,909 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:14,123 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 13:15:14,123 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:14,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:14,124 INFO L82 PathProgramCache]: Analyzing trace with hash -1653107870, now seen corresponding path program 3 times [2021-05-02 13:15:14,124 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:14,124 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443089647] [2021-05-02 13:15:14,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:14,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:14,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:14,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:14,331 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:14,331 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:14,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443089647] [2021-05-02 13:15:14,332 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [443089647] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:14,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103239558] [2021-05-02 13:15:14,332 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 13:15:14,427 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 13:15:14,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:14,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:15:14,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:14,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:14,675 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 13:15:14,676 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1103239558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:14,676 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:14,676 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 14 [2021-05-02 13:15:14,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178976552] [2021-05-02 13:15:14,679 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:15:14,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:14,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:15:14,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:15:14,682 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 14 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 13 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:15,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:15,523 INFO L93 Difference]: Finished difference Result 52 states and 59 transitions. [2021-05-02 13:15:15,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:15:15,523 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 13 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 13:15:15,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:15,524 INFO L225 Difference]: With dead ends: 52 [2021-05-02 13:15:15,524 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 13:15:15,526 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 811.7ms TimeCoverageRelationStatistics Valid=146, Invalid=504, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:15:15,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 13:15:15,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-02 13:15:15,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 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 13:15:15,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-05-02 13:15:15,533 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 29 [2021-05-02 13:15:15,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:15,534 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-05-02 13:15:15,534 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.5714285714285716) internal successors, (36), 13 states have internal predecessors, (36), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:15,534 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-05-02 13:15:15,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 13:15:15,535 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:15,535 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:15,753 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:15,754 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:15,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:15,754 INFO L82 PathProgramCache]: Analyzing trace with hash -86495988, now seen corresponding path program 4 times [2021-05-02 13:15:15,754 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:15,755 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108230840] [2021-05-02 13:15:15,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:15,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:15,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:15,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:15,973 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:15:15,974 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:15,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108230840] [2021-05-02 13:15:15,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1108230840] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:15,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1673584927] [2021-05-02 13:15:15,974 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 13:15:16,029 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:15:16,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:16,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:15:16,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:16,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:16,179 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 38 proven. 77 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:15:16,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1673584927] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:16,180 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:16,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 13:15:16,184 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096375706] [2021-05-02 13:15:16,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:15:16,188 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:16,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:15:16,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:15:16,190 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:16,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:16,651 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2021-05-02 13:15:16,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:15:16,652 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 38 [2021-05-02 13:15:16,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:16,653 INFO L225 Difference]: With dead ends: 58 [2021-05-02 13:15:16,653 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 13:15:16,654 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 364.3ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:15:16,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 13:15:16,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2021-05-02 13:15:16,659 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 13:15:16,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-05-02 13:15:16,660 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 38 [2021-05-02 13:15:16,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:16,661 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-05-02 13:15:16,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 11 states have internal predecessors, (37), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:16,661 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-05-02 13:15:16,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 13:15:16,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:16,662 INFO L523 BasicCegarLoop]: trace histogram [10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:16,877 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:16,877 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:16,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:16,878 INFO L82 PathProgramCache]: Analyzing trace with hash 1259331364, now seen corresponding path program 5 times [2021-05-02 13:15:16,878 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:16,878 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863322994] [2021-05-02 13:15:16,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:16,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:17,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:17,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:17,133 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 43 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:15:17,134 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:17,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863322994] [2021-05-02 13:15:17,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [863322994] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:17,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855670405] [2021-05-02 13:15:17,135 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 13:15:17,299 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2021-05-02 13:15:17,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:17,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 13:15:17,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:17,446 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 43 proven. 100 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:15:17,447 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855670405] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:17,447 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:17,447 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2021-05-02 13:15:17,447 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671977019] [2021-05-02 13:15:17,448 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:15:17,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:17,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:15:17,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:15:17,450 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 13 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:18,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:18,051 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2021-05-02 13:15:18,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:15:18,052 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 13 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 41 [2021-05-02 13:15:18,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:18,053 INFO L225 Difference]: With dead ends: 61 [2021-05-02 13:15:18,053 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 13:15:18,054 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 491.4ms TimeCoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:15:18,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 13:15:18,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-05-02 13:15:18,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.0731707317073171) internal successors, (44), 41 states have internal predecessors, (44), 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 13:15:18,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2021-05-02 13:15:18,063 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 41 [2021-05-02 13:15:18,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:18,063 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2021-05-02 13:15:18,064 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 13 states have internal predecessors, (40), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:18,064 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2021-05-02 13:15:18,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 13:15:18,065 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:18,065 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:18,272 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 13:15:18,273 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:18,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:18,274 INFO L82 PathProgramCache]: Analyzing trace with hash 1282266636, now seen corresponding path program 6 times [2021-05-02 13:15:18,274 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:18,274 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003252041] [2021-05-02 13:15:18,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:18,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:18,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:18,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:18,524 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 48 proven. 126 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:15:18,524 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:18,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003252041] [2021-05-02 13:15:18,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2003252041] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:18,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768139854] [2021-05-02 13:15:18,525 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 13:15:18,699 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-05-02 13:15:18,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:18,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 13:15:18,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:18,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:19,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:19,028 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 70 proven. 19 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2021-05-02 13:15:19,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768139854] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:19,029 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:19,029 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 19 [2021-05-02 13:15:19,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445150259] [2021-05-02 13:15:19,030 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:15:19,030 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:19,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:15:19,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:15:19,032 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand has 19 states, 19 states have (on average 2.8421052631578947) internal successors, (54), 18 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 13:15:20,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:20,564 INFO L93 Difference]: Finished difference Result 71 states and 79 transitions. [2021-05-02 13:15:20,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:15:20,565 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.8421052631578947) internal successors, (54), 18 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 44 [2021-05-02 13:15:20,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:20,566 INFO L225 Difference]: With dead ends: 71 [2021-05-02 13:15:20,566 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 13:15:20,567 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 1368.6ms TimeCoverageRelationStatistics Valid=219, Invalid=1041, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:15:20,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 13:15:20,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2021-05-02 13:15:20,575 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 13:15:20,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-02 13:15:20,576 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 44 [2021-05-02 13:15:20,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:20,576 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-02 13:15:20,577 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.8421052631578947) internal successors, (54), 18 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 13:15:20,577 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-02 13:15:20,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-05-02 13:15:20,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:20,578 INFO L523 BasicCegarLoop]: trace histogram [14, 14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:20,786 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:20,786 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:20,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:20,787 INFO L82 PathProgramCache]: Analyzing trace with hash -1495269342, now seen corresponding path program 7 times [2021-05-02 13:15:20,787 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:20,787 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535920718] [2021-05-02 13:15:20,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:20,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:21,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:21,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:21,035 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 93 proven. 187 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:15:21,036 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:21,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535920718] [2021-05-02 13:15:21,036 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535920718] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:21,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956444277] [2021-05-02 13:15:21,037 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 13:15:21,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:21,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 13:15:21,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:21,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:21,236 INFO L134 CoverageAnalysis]: Checked inductivity of 287 backedges. 93 proven. 187 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:15:21,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956444277] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:21,237 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:21,237 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 13:15:21,237 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298683725] [2021-05-02 13:15:21,238 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:15:21,238 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:21,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:15:21,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:15:21,239 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:21,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:21,974 INFO L93 Difference]: Finished difference Result 76 states and 81 transitions. [2021-05-02 13:15:21,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:15:21,975 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 53 [2021-05-02 13:15:21,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:21,982 INFO L225 Difference]: With dead ends: 76 [2021-05-02 13:15:21,983 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 13:15:21,984 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 579.5ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:15:21,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 13:15:22,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-02 13:15:22,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 53 states have (on average 1.0566037735849056) internal successors, (56), 53 states have internal predecessors, (56), 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 13:15:22,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2021-05-02 13:15:22,009 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 53 [2021-05-02 13:15:22,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:22,010 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2021-05-02 13:15:22,010 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 3.0625) internal successors, (49), 15 states have internal predecessors, (49), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:22,010 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2021-05-02 13:15:22,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 13:15:22,011 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:22,012 INFO L523 BasicCegarLoop]: trace histogram [15, 15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:22,212 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:22,213 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:22,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:22,214 INFO L82 PathProgramCache]: Analyzing trace with hash -1816470774, now seen corresponding path program 8 times [2021-05-02 13:15:22,214 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:22,214 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1905946485] [2021-05-02 13:15:22,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:22,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:22,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:22,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:22,535 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 101 proven. 222 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:15:22,535 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:22,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1905946485] [2021-05-02 13:15:22,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1905946485] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:22,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912049381] [2021-05-02 13:15:22,536 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 13:15:22,606 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:15:22,607 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:22,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 13:15:22,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:22,771 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:22,789 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 101 proven. 222 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:15:22,789 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1912049381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:22,789 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:22,790 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2021-05-02 13:15:22,792 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794533642] [2021-05-02 13:15:22,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 13:15:22,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:22,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 13:15:22,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 13:15:22,796 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:23,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:23,633 INFO L93 Difference]: Finished difference Result 79 states and 84 transitions. [2021-05-02 13:15:23,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 13:15:23,634 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 56 [2021-05-02 13:15:23,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:23,636 INFO L225 Difference]: With dead ends: 79 [2021-05-02 13:15:23,636 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 13:15:23,637 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 647.6ms TimeCoverageRelationStatistics Valid=109, Invalid=761, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:15:23,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 13:15:23,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 13:15:23,648 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 13:15:23,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-02 13:15:23,654 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 56 [2021-05-02 13:15:23,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:23,654 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-02 13:15:23,654 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 16 states have internal predecessors, (52), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:23,655 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-02 13:15:23,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:15:23,660 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:23,660 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:23,885 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 13:15:23,885 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:23,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:23,886 INFO L82 PathProgramCache]: Analyzing trace with hash -1541195998, now seen corresponding path program 9 times [2021-05-02 13:15:23,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:23,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [540381510] [2021-05-02 13:15:23,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:23,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:24,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:24,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:24,187 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 109 proven. 260 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:15:24,187 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:24,187 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [540381510] [2021-05-02 13:15:24,187 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [540381510] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:24,187 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163141374] [2021-05-02 13:15:24,188 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 13:15:24,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-05-02 13:15:24,289 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:24,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 13:15:24,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:24,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:24,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:24,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:24,783 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 139 proven. 15 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-05-02 13:15:24,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [163141374] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:24,784 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:24,784 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 9] total 24 [2021-05-02 13:15:24,784 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25677271] [2021-05-02 13:15:24,785 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 13:15:24,786 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:24,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 13:15:24,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:15:24,787 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 24 states, 24 states have (on average 2.8333333333333335) internal successors, (68), 23 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:26,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:26,992 INFO L93 Difference]: Finished difference Result 89 states and 97 transitions. [2021-05-02 13:15:26,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 13:15:26,993 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 2.8333333333333335) internal successors, (68), 23 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 13:15:26,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:26,994 INFO L225 Difference]: With dead ends: 89 [2021-05-02 13:15:26,994 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 13:15:26,996 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 1914.2ms TimeCoverageRelationStatistics Valid=292, Invalid=1778, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 13:15:26,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 13:15:27,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2021-05-02 13:15:27,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 65 states have internal predecessors, (68), 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 13:15:27,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2021-05-02 13:15:27,011 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 59 [2021-05-02 13:15:27,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:27,012 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2021-05-02 13:15:27,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 2.8333333333333335) internal successors, (68), 23 states have internal predecessors, (68), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:27,012 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2021-05-02 13:15:27,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 13:15:27,026 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:27,026 INFO L523 BasicCegarLoop]: trace histogram [19, 19, 15, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:27,227 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 13:15:27,228 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:27,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:27,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1189032268, now seen corresponding path program 10 times [2021-05-02 13:15:27,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:27,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298496032] [2021-05-02 13:15:27,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:27,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:27,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:27,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:27,614 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 172 proven. 345 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:15:27,615 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:27,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298496032] [2021-05-02 13:15:27,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298496032] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:27,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1357680248] [2021-05-02 13:15:27,615 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 13:15:27,668 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:15:27,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:27,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 13:15:27,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:27,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:27,864 INFO L134 CoverageAnalysis]: Checked inductivity of 532 backedges. 172 proven. 345 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:15:27,864 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1357680248] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:27,865 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:27,865 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 13:15:27,866 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709702380] [2021-05-02 13:15:27,867 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 13:15:27,867 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:27,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 13:15:27,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:15:27,868 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:28,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:28,969 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2021-05-02 13:15:28,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:15:28,970 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 68 [2021-05-02 13:15:28,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:28,971 INFO L225 Difference]: With dead ends: 94 [2021-05-02 13:15:28,971 INFO L226 Difference]: Without dead ends: 74 [2021-05-02 13:15:28,973 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 845.1ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:15:28,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-05-02 13:15:28,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2021-05-02 13:15:28,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:28,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2021-05-02 13:15:28,981 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 68 [2021-05-02 13:15:28,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:28,981 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2021-05-02 13:15:28,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 3.05) internal successors, (61), 19 states have internal predecessors, (61), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:28,981 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2021-05-02 13:15:28,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-05-02 13:15:28,982 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:28,983 INFO L523 BasicCegarLoop]: trace histogram [20, 20, 16, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:29,209 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 13:15:29,209 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:29,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:29,210 INFO L82 PathProgramCache]: Analyzing trace with hash 1843800420, now seen corresponding path program 11 times [2021-05-02 13:15:29,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:29,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706631857] [2021-05-02 13:15:29,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:29,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:29,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:29,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:29,539 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 183 proven. 392 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:15:29,539 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:29,539 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706631857] [2021-05-02 13:15:29,539 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706631857] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:29,540 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999423735] [2021-05-02 13:15:29,540 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 13:15:30,577 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2021-05-02 13:15:30,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:30,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 13:15:30,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:30,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:30,978 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 183 proven. 392 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:15:30,978 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999423735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:30,978 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:30,978 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2021-05-02 13:15:30,979 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880794487] [2021-05-02 13:15:30,979 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 13:15:30,979 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:30,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 13:15:30,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:15:30,981 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:32,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:32,077 INFO L93 Difference]: Finished difference Result 97 states and 102 transitions. [2021-05-02 13:15:32,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 13:15:32,078 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 71 [2021-05-02 13:15:32,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:32,078 INFO L225 Difference]: With dead ends: 97 [2021-05-02 13:15:32,078 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 13:15:32,079 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 57 SyntacticMatches, 17 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 1047.2ms TimeCoverageRelationStatistics Valid=141, Invalid=1265, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:15:32,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 13:15:32,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2021-05-02 13:15:32,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0422535211267605) internal successors, (74), 71 states have internal predecessors, (74), 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 13:15:32,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2021-05-02 13:15:32,085 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 71 [2021-05-02 13:15:32,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:32,086 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2021-05-02 13:15:32,086 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 3.0476190476190474) internal successors, (64), 20 states have internal predecessors, (64), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:32,086 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2021-05-02 13:15:32,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 13:15:32,087 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:32,087 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:32,296 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:32,296 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:32,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:32,297 INFO L82 PathProgramCache]: Analyzing trace with hash 300358220, now seen corresponding path program 12 times [2021-05-02 13:15:32,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:32,297 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245288455] [2021-05-02 13:15:32,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:32,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:32,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:32,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:32,650 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 194 proven. 442 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:15:32,650 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:32,650 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245288455] [2021-05-02 13:15:32,650 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245288455] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:32,650 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1237811676] [2021-05-02 13:15:32,650 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 13:15:32,937 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-02 13:15:32,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:32,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 13:15:32,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:33,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:33,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:33,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:33,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:33,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:34,006 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 285 proven. 116 refuted. 0 times theorem prover too weak. 250 trivial. 0 not checked. [2021-05-02 13:15:34,007 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1237811676] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:34,007 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:34,007 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 15] total 34 [2021-05-02 13:15:34,008 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910691222] [2021-05-02 13:15:34,008 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:15:34,009 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:34,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:15:34,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1005, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:15:34,010 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 34 states, 34 states have (on average 2.7058823529411766) internal successors, (92), 33 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:37,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:37,989 INFO L93 Difference]: Finished difference Result 114 states and 125 transitions. [2021-05-02 13:15:37,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 13:15:37,989 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 2.7058823529411766) internal successors, (92), 33 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-02 13:15:37,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:37,990 INFO L225 Difference]: With dead ends: 114 [2021-05-02 13:15:37,990 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 13:15:37,992 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 61 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 613 ImplicationChecksByTransitivity, 3724.8ms TimeCoverageRelationStatistics Valid=646, Invalid=3644, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:15:37,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 13:15:37,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 87. [2021-05-02 13:15:37,997 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 13:15:37,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2021-05-02 13:15:37,998 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 74 [2021-05-02 13:15:37,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:37,999 INFO L480 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2021-05-02 13:15:37,999 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 2.7058823529411766) internal successors, (92), 33 states have internal predecessors, (92), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:37,999 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2021-05-02 13:15:38,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-05-02 13:15:38,000 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:38,000 INFO L523 BasicCegarLoop]: trace histogram [25, 25, 19, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:38,207 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 13:15:38,207 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:38,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:38,208 INFO L82 PathProgramCache]: Analyzing trace with hash -659655796, now seen corresponding path program 13 times [2021-05-02 13:15:38,208 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:38,208 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364570954] [2021-05-02 13:15:38,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:38,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:38,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:38,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:38,639 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 334 proven. 551 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:15:38,639 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:38,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364570954] [2021-05-02 13:15:38,639 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364570954] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:38,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1826208150] [2021-05-02 13:15:38,639 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 13:15:38,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:38,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 13:15:38,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:38,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:38,939 INFO L134 CoverageAnalysis]: Checked inductivity of 925 backedges. 334 proven. 551 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:15:38,940 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1826208150] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:38,940 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:38,940 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 13:15:38,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127275364] [2021-05-02 13:15:38,943 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 13:15:38,943 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:38,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 13:15:38,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:15:38,944 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:40,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:40,237 INFO L93 Difference]: Finished difference Result 116 states and 121 transitions. [2021-05-02 13:15:40,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 13:15:40,238 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 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 86 [2021-05-02 13:15:40,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:40,238 INFO L225 Difference]: With dead ends: 116 [2021-05-02 13:15:40,238 INFO L226 Difference]: Without dead ends: 91 [2021-05-02 13:15:40,239 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 88 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 979.3ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 13:15:40,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-02 13:15:40,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2021-05-02 13:15:40,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.035294117647059) internal successors, (88), 85 states have internal predecessors, (88), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:40,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2021-05-02 13:15:40,246 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 86 [2021-05-02 13:15:40,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:40,247 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2021-05-02 13:15:40,247 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:40,247 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2021-05-02 13:15:40,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 13:15:40,248 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:40,248 INFO L523 BasicCegarLoop]: trace histogram [26, 26, 20, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:40,449 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 13:15:40,449 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:40,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:40,450 INFO L82 PathProgramCache]: Analyzing trace with hash -522152540, now seen corresponding path program 14 times [2021-05-02 13:15:40,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:40,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695967898] [2021-05-02 13:15:40,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:40,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:40,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:40,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:40,893 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 610 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:15:40,893 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:40,893 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695967898] [2021-05-02 13:15:40,894 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695967898] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:40,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1356154583] [2021-05-02 13:15:40,894 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 13:15:40,970 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:15:40,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:40,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 13:15:40,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:41,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:41,167 INFO L134 CoverageAnalysis]: Checked inductivity of 1001 backedges. 351 proven. 610 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:15:41,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1356154583] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:41,167 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:41,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 13:15:41,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836266161] [2021-05-02 13:15:41,169 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:15:41,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:41,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:15:41,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:15:41,171 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:42,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:42,670 INFO L93 Difference]: Finished difference Result 119 states and 124 transitions. [2021-05-02 13:15:42,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:15:42,671 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-02 13:15:42,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:42,672 INFO L225 Difference]: With dead ends: 119 [2021-05-02 13:15:42,672 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 13:15:42,673 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 1126.6ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 13:15:42,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 13:15:42,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2021-05-02 13:15:42,679 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 13:15:42,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-05-02 13:15:42,680 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 89 [2021-05-02 13:15:42,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:42,681 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-05-02 13:15:42,681 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.04) internal successors, (76), 24 states have internal predecessors, (76), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:42,681 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-05-02 13:15:42,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 13:15:42,682 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:42,682 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 21, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:42,905 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:42,905 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:42,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:42,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1561453428, now seen corresponding path program 15 times [2021-05-02 13:15:42,906 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:42,906 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1683077953] [2021-05-02 13:15:42,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:42,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:43,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:43,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:43,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 368 proven. 672 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:15:43,382 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:43,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1683077953] [2021-05-02 13:15:43,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1683077953] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:43,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2116331597] [2021-05-02 13:15:43,382 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 13:15:43,593 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-05-02 13:15:43,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:43,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 25 conjunts are in the unsatisfiable core [2021-05-02 13:15:43,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:43,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:44,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:44,705 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 413 proven. 57 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2021-05-02 13:15:44,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2116331597] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:44,706 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:44,706 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 12] total 35 [2021-05-02 13:15:44,706 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783172586] [2021-05-02 13:15:44,707 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:15:44,707 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:44,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:15:44,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:15:44,708 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 34 states have internal predecessors, (101), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:48,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:48,819 INFO L93 Difference]: Finished difference Result 130 states and 139 transitions. [2021-05-02 13:15:48,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 13:15:48,819 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 34 states have internal predecessors, (101), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 92 [2021-05-02 13:15:48,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:48,820 INFO L225 Difference]: With dead ends: 130 [2021-05-02 13:15:48,821 INFO L226 Difference]: Without dead ends: 105 [2021-05-02 13:15:48,822 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 80 SyntacticMatches, 6 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 563 ImplicationChecksByTransitivity, 3649.7ms TimeCoverageRelationStatistics Valid=447, Invalid=4109, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 13:15:48,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2021-05-02 13:15:48,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 103. [2021-05-02 13:15:48,829 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 13:15:48,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 105 transitions. [2021-05-02 13:15:48,830 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 105 transitions. Word has length 92 [2021-05-02 13:15:48,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:48,831 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 105 transitions. [2021-05-02 13:15:48,831 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 2.8857142857142857) internal successors, (101), 34 states have internal predecessors, (101), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:48,831 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 105 transitions. [2021-05-02 13:15:48,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 13:15:48,832 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:48,832 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 23, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:49,039 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:49,040 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:49,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:49,040 INFO L82 PathProgramCache]: Analyzing trace with hash -2029901406, now seen corresponding path program 16 times [2021-05-02 13:15:49,041 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:49,041 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855196194] [2021-05-02 13:15:49,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:49,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:49,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:49,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:49,597 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 473 proven. 805 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:15:49,597 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:49,597 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855196194] [2021-05-02 13:15:49,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [855196194] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:49,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638797081] [2021-05-02 13:15:49,598 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 13:15:49,677 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:15:49,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:49,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 13:15:49,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:49,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:49,918 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 473 proven. 805 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:15:49,919 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638797081] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:49,919 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:49,919 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 13:15:49,919 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277327421] [2021-05-02 13:15:49,922 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:15:49,922 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:49,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:15:49,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:15:49,925 INFO L87 Difference]: Start difference. First operand 103 states and 105 transitions. Second operand has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:51,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:51,805 INFO L93 Difference]: Finished difference Result 136 states and 141 transitions. [2021-05-02 13:15:51,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:15:51,806 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-02 13:15:51,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:51,807 INFO L225 Difference]: With dead ends: 136 [2021-05-02 13:15:51,807 INFO L226 Difference]: Without dead ends: 107 [2021-05-02 13:15:51,808 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 1399.3ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 13:15:51,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-02 13:15:51,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2021-05-02 13:15:51,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 101 states have (on average 1.0297029702970297) internal successors, (104), 101 states have internal predecessors, (104), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:51,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 108 transitions. [2021-05-02 13:15:51,817 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 108 transitions. Word has length 101 [2021-05-02 13:15:51,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:51,817 INFO L480 AbstractCegarLoop]: Abstraction has 106 states and 108 transitions. [2021-05-02 13:15:51,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 3.0357142857142856) internal successors, (85), 27 states have internal predecessors, (85), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:51,817 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 108 transitions. [2021-05-02 13:15:51,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-02 13:15:51,818 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:51,818 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:52,033 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:52,033 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:52,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:52,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1505006730, now seen corresponding path program 17 times [2021-05-02 13:15:52,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:52,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51266709] [2021-05-02 13:15:52,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:52,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:52,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:52,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:52,600 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 876 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:15:52,600 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:52,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51266709] [2021-05-02 13:15:52,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [51266709] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:52,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [200995408] [2021-05-02 13:15:52,601 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 13:16:21,860 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 32 check-sat command(s) [2021-05-02 13:16:21,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:21,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 82 conjunts are in the unsatisfiable core [2021-05-02 13:16:21,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:22,451 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 493 proven. 876 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:16:22,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [200995408] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:22,452 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:22,452 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 30 [2021-05-02 13:16:22,452 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859014951] [2021-05-02 13:16:22,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 13:16:22,453 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:22,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 13:16:22,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:16:22,454 INFO L87 Difference]: Start difference. First operand 106 states and 108 transitions. Second operand has 30 states, 30 states have (on average 2.933333333333333) internal successors, (88), 29 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:24,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:24,213 INFO L93 Difference]: Finished difference Result 139 states and 144 transitions. [2021-05-02 13:16:24,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 13:16:24,215 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.933333333333333) internal successors, (88), 29 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-02 13:16:24,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:24,216 INFO L225 Difference]: With dead ends: 139 [2021-05-02 13:16:24,216 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 13:16:24,217 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 81 SyntacticMatches, 25 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 1719.2ms TimeCoverageRelationStatistics Valid=216, Invalid=2864, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:16:24,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 13:16:24,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2021-05-02 13:16:24,222 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 13:16:24,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-05-02 13:16:24,222 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 104 [2021-05-02 13:16:24,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:24,222 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-05-02 13:16:24,222 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 2.933333333333333) internal successors, (88), 29 states have internal predecessors, (88), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:24,223 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-05-02 13:16:24,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 13:16:24,223 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:24,223 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 25, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:24,428 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 13:16:24,429 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:24,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:24,429 INFO L82 PathProgramCache]: Analyzing trace with hash 1650155682, now seen corresponding path program 18 times [2021-05-02 13:16:24,429 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:24,429 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354395584] [2021-05-02 13:16:24,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:24,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:24,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:24,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:24,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 513 proven. 950 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:16:24,993 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:24,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354395584] [2021-05-02 13:16:24,993 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [354395584] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:24,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051380948] [2021-05-02 13:16:24,994 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 13:16:26,839 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-05-02 13:16:26,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:26,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 13:16:26,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:26,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:28,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:28,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:29,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:29,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 597 proven. 605 refuted. 0 times theorem prover too weak. 318 trivial. 0 not checked. [2021-05-02 13:16:29,095 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051380948] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:29,095 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:29,095 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 56 [2021-05-02 13:16:29,095 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688078310] [2021-05-02 13:16:29,097 INFO L460 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-05-02 13:16:29,097 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:29,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-05-02 13:16:29,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=2820, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:16:29,098 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 56 states, 56 states have (on average 2.5535714285714284) internal successors, (143), 55 states have internal predecessors, (143), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:35,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:35,605 INFO L93 Difference]: Finished difference Result 170 states and 185 transitions. [2021-05-02 13:16:35,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-05-02 13:16:35,605 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 2.5535714285714284) internal successors, (143), 55 states have internal predecessors, (143), 2 states have call successors, (4), 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 13:16:35,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:35,607 INFO L225 Difference]: With dead ends: 170 [2021-05-02 13:16:35,607 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 13:16:35,610 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 80 SyntacticMatches, 4 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2066 ImplicationChecksByTransitivity, 6680.1ms TimeCoverageRelationStatistics Valid=1551, Invalid=10005, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 13:16:35,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 13:16:35,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 118. [2021-05-02 13:16:35,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0265486725663717) internal successors, (116), 113 states have internal predecessors, (116), 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 13:16:35,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2021-05-02 13:16:35,618 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 107 [2021-05-02 13:16:35,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:35,618 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2021-05-02 13:16:35,619 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 56 states, 56 states have (on average 2.5535714285714284) internal successors, (143), 55 states have internal predecessors, (143), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:35,619 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2021-05-02 13:16:35,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-02 13:16:35,619 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:35,620 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 27, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:35,837 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 13:16:35,837 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:35,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:35,837 INFO L82 PathProgramCache]: Analyzing trace with hash -349268020, now seen corresponding path program 19 times [2021-05-02 13:16:35,837 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:35,837 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698766396] [2021-05-02 13:16:35,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:35,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:36,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:36,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:36,411 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 636 proven. 1107 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:16:36,412 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:36,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698766396] [2021-05-02 13:16:36,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [698766396] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:36,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705794441] [2021-05-02 13:16:36,412 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 13:16:36,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:36,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 13:16:36,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:36,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:36,700 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 636 proven. 1107 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:16:36,700 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [705794441] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:36,700 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:36,700 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 13:16:36,700 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810731750] [2021-05-02 13:16:36,702 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 13:16:36,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:36,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 13:16:36,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:16:36,703 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:38,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:38,710 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2021-05-02 13:16:38,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:16:38,711 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 2 states have call successors, (4), 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 116 [2021-05-02 13:16:38,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:38,711 INFO L225 Difference]: With dead ends: 154 [2021-05-02 13:16:38,711 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 13:16:38,712 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 1429.6ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 13:16:38,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 13:16:38,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2021-05-02 13:16:38,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:38,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2021-05-02 13:16:38,719 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 116 [2021-05-02 13:16:38,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:38,719 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2021-05-02 13:16:38,719 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 3.03125) internal successors, (97), 31 states have internal predecessors, (97), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:38,719 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2021-05-02 13:16:38,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-02 13:16:38,720 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:38,720 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 28, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:38,928 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:38,929 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:38,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:38,929 INFO L82 PathProgramCache]: Analyzing trace with hash -263454748, now seen corresponding path program 20 times [2021-05-02 13:16:38,929 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:38,929 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912764563] [2021-05-02 13:16:38,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:38,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:39,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:39,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:39,550 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 659 proven. 1190 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:16:39,550 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:39,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912764563] [2021-05-02 13:16:39,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [912764563] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:39,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874136820] [2021-05-02 13:16:39,550 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 13:16:39,627 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:39,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:39,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 13:16:39,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:39,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:39,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 659 proven. 1190 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:16:39,883 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [874136820] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:39,883 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:39,884 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2021-05-02 13:16:39,884 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421634815] [2021-05-02 13:16:39,884 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:16:39,884 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:39,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:16:39,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:16:39,885 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:41,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:41,914 INFO L93 Difference]: Finished difference Result 157 states and 162 transitions. [2021-05-02 13:16:41,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 13:16:41,922 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-05-02 13:16:41,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:41,923 INFO L225 Difference]: With dead ends: 157 [2021-05-02 13:16:41,923 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 13:16:41,924 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 121 SyntacticMatches, 1 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 1481.2ms TimeCoverageRelationStatistics Valid=237, Invalid=3545, Unknown=0, NotChecked=0, Total=3782 [2021-05-02 13:16:41,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 13:16:41,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2021-05-02 13:16:41,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0252100840336134) internal successors, (122), 119 states have internal predecessors, (122), 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 13:16:41,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2021-05-02 13:16:41,929 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 119 [2021-05-02 13:16:41,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:41,929 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2021-05-02 13:16:41,929 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 3.0303030303030303) internal successors, (100), 32 states have internal predecessors, (100), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:41,929 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2021-05-02 13:16:41,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-02 13:16:41,930 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:41,930 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 29, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:42,140 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 13:16:42,140 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:42,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:42,141 INFO L82 PathProgramCache]: Analyzing trace with hash 694190284, now seen corresponding path program 21 times [2021-05-02 13:16:42,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:42,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907146470] [2021-05-02 13:16:42,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:42,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:42,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:42,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:42,786 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 682 proven. 1276 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:16:42,786 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:42,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907146470] [2021-05-02 13:16:42,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1907146470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:42,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [717253443] [2021-05-02 13:16:42,787 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 13:16:43,343 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 13:16:43,343 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:43,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 13:16:43,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:43,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:45,353 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 745 proven. 100 refuted. 0 times theorem prover too weak. 1190 trivial. 0 not checked. [2021-05-02 13:16:45,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [717253443] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:45,353 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:45,353 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 14] total 45 [2021-05-02 13:16:45,353 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734775730] [2021-05-02 13:16:45,354 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 13:16:45,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:45,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 13:16:45,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 13:16:45,355 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 44 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:51,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:51,373 INFO L93 Difference]: Finished difference Result 167 states and 175 transitions. [2021-05-02 13:16:51,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 13:16:51,374 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 44 states have internal predecessors, (131), 2 states have call successors, (4), 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 122 [2021-05-02 13:16:51,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:51,375 INFO L225 Difference]: With dead ends: 167 [2021-05-02 13:16:51,375 INFO L226 Difference]: Without dead ends: 135 [2021-05-02 13:16:51,376 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 101 SyntacticMatches, 13 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 958 ImplicationChecksByTransitivity, 5478.9ms TimeCoverageRelationStatistics Valid=593, Invalid=7063, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 13:16:51,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-02 13:16:51,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 133. [2021-05-02 13:16:51,384 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 13:16:51,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-02 13:16:51,384 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 122 [2021-05-02 13:16:51,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:51,385 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-02 13:16:51,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 44 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:51,385 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-02 13:16:51,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 13:16:51,385 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:51,386 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 31, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:51,599 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:51,599 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:51,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:51,600 INFO L82 PathProgramCache]: Analyzing trace with hash 2037914978, now seen corresponding path program 22 times [2021-05-02 13:16:51,600 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:51,600 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1874032005] [2021-05-02 13:16:51,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:51,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:52,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:52,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:52,416 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:16:52,416 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:52,416 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1874032005] [2021-05-02 13:16:52,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1874032005] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:52,417 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353362085] [2021-05-02 13:16:52,418 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 13:16:52,490 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:16:52,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:52,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 13:16:52,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:52,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:52,749 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 823 proven. 1457 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:16:52,750 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353362085] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:52,750 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:52,750 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 13:16:52,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184904088] [2021-05-02 13:16:52,751 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 13:16:52,751 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:52,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 13:16:52,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:16:52,751 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:55,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:55,299 INFO L93 Difference]: Finished difference Result 172 states and 177 transitions. [2021-05-02 13:16:55,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 13:16:55,299 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-02 13:16:55,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:55,300 INFO L225 Difference]: With dead ends: 172 [2021-05-02 13:16:55,300 INFO L226 Difference]: Without dead ends: 137 [2021-05-02 13:16:55,301 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1909.9ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 13:16:55,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-02 13:16:55,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2021-05-02 13:16:55,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.0229007633587786) internal successors, (134), 131 states have internal predecessors, (134), 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 13:16:55,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2021-05-02 13:16:55,309 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 131 [2021-05-02 13:16:55,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:55,309 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2021-05-02 13:16:55,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 35 states have internal predecessors, (109), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:16:55,309 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2021-05-02 13:16:55,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-02 13:16:55,310 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:55,310 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 32, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:55,516 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 13:16:55,517 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:55,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:55,517 INFO L82 PathProgramCache]: Analyzing trace with hash 1586135626, now seen corresponding path program 23 times [2021-05-02 13:16:55,517 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:55,517 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1275253501] [2021-05-02 13:16:55,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:55,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:56,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:56,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:56,346 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:16:56,347 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:56,347 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1275253501] [2021-05-02 13:16:56,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1275253501] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:56,347 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102155237] [2021-05-02 13:16:56,347 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 13:18:30,535 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 42 check-sat command(s) [2021-05-02 13:18:30,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:18:30,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 77 conjunts are in the unsatisfiable core [2021-05-02 13:18:30,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:18:30,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:18:30,864 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 849 proven. 1552 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:18:30,864 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102155237] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:30,864 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:18:30,864 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 13:18:30,864 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632948984] [2021-05-02 13:18:30,865 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 13:18:30,865 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:18:30,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 13:18:30,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:18:30,865 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:33,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:18:33,604 INFO L93 Difference]: Finished difference Result 175 states and 180 transitions. [2021-05-02 13:18:33,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 13:18:33,605 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2021-05-02 13:18:33,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:18:33,606 INFO L225 Difference]: With dead ends: 175 [2021-05-02 13:18:33,606 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 13:18:33,607 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 132 SyntacticMatches, 5 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 537 ImplicationChecksByTransitivity, 2006.2ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 13:18:33,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 13:18:33,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-02 13:18:33,617 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 13:18:33,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-02 13:18:33,618 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 134 [2021-05-02 13:18:33,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:18:33,618 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-02 13:18:33,618 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 3.027027027027027) internal successors, (112), 36 states have internal predecessors, (112), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:33,618 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-02 13:18:33,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 13:18:33,618 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:18:33,619 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 33, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:18:33,819 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 13:18:33,819 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:18:33,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:18:33,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1240001438, now seen corresponding path program 24 times [2021-05-02 13:18:33,820 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:18:33,820 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836830990] [2021-05-02 13:18:33,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:18:33,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:34,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:18:34,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:34,623 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 875 proven. 1650 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:18:34,623 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:18:34,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836830990] [2021-05-02 13:18:34,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836830990] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:34,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [200391879] [2021-05-02 13:18:34,623 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:18:38,958 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2021-05-02 13:18:38,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:18:38,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 85 conjunts are in the unsatisfiable core [2021-05-02 13:18:38,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:18:42,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:18:46,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:18:46,161 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 1220 proven. 907 refuted. 0 times theorem prover too weak. 498 trivial. 0 not checked. [2021-05-02 13:18:46,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [200391879] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:46,161 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:18:46,161 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 41] total 76 [2021-05-02 13:18:46,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947563587] [2021-05-02 13:18:46,162 INFO L460 AbstractCegarLoop]: Interpolant automaton has 76 states [2021-05-02 13:18:46,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:18:46,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2021-05-02 13:18:46,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=507, Invalid=5193, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 13:18:46,163 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 76 states, 76 states have (on average 2.4473684210526314) internal successors, (186), 75 states have internal predecessors, (186), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:58,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:18:58,590 INFO L93 Difference]: Finished difference Result 224 states and 245 transitions. [2021-05-02 13:18:58,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-02 13:18:58,590 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 2.4473684210526314) internal successors, (186), 75 states have internal predecessors, (186), 2 states have call successors, (4), 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 13:18:58,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:18:58,591 INFO L225 Difference]: With dead ends: 224 [2021-05-02 13:18:58,591 INFO L226 Difference]: Without dead ends: 189 [2021-05-02 13:18:58,593 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 85 SyntacticMatches, 17 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4215 ImplicationChecksByTransitivity, 15585.0ms TimeCoverageRelationStatistics Valid=3162, Invalid=19188, Unknown=0, NotChecked=0, Total=22350 [2021-05-02 13:18:58,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-05-02 13:18:58,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 148. [2021-05-02 13:18:58,602 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 13:18:58,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2021-05-02 13:18:58,603 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 137 [2021-05-02 13:18:58,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:18:58,603 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2021-05-02 13:18:58,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 76 states, 76 states have (on average 2.4473684210526314) internal successors, (186), 75 states have internal predecessors, (186), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:18:58,603 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2021-05-02 13:18:58,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-02 13:18:58,604 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:18:58,604 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 35, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:18:58,811 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 13:18:58,811 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:18:58,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:18:58,811 INFO L82 PathProgramCache]: Analyzing trace with hash 1551600652, now seen corresponding path program 25 times [2021-05-02 13:18:58,811 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:18:58,812 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501493630] [2021-05-02 13:18:58,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:18:58,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:59,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:18:59,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:59,889 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1034 proven. 1855 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 13:18:59,889 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:18:59,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501493630] [2021-05-02 13:18:59,889 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501493630] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:59,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734893930] [2021-05-02 13:18:59,889 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 13:18:59,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:59,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 73 conjunts are in the unsatisfiable core [2021-05-02 13:18:59,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:19:00,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:00,267 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 1034 proven. 1855 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 13:19:00,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [734893930] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:00,267 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:19:00,267 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38] total 40 [2021-05-02 13:19:00,267 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857378676] [2021-05-02 13:19:00,268 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 13:19:00,268 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:00,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 13:19:00,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:19:00,269 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand has 40 states, 40 states have (on average 3.025) internal successors, (121), 39 states have internal predecessors, (121), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:03,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:03,734 INFO L93 Difference]: Finished difference Result 190 states and 195 transitions. [2021-05-02 13:19:03,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-05-02 13:19:03,735 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 3.025) internal successors, (121), 39 states have internal predecessors, (121), 2 states have call successors, (4), 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 146 [2021-05-02 13:19:03,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:03,736 INFO L225 Difference]: With dead ends: 190 [2021-05-02 13:19:03,736 INFO L226 Difference]: Without dead ends: 152 [2021-05-02 13:19:03,737 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 148 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 634 ImplicationChecksByTransitivity, 2458.4ms TimeCoverageRelationStatistics Valid=293, Invalid=5407, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 13:19:03,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-05-02 13:19:03,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 151. [2021-05-02 13:19:03,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 146 states have (on average 1.0205479452054795) internal successors, (149), 146 states have internal predecessors, (149), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:03,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 153 transitions. [2021-05-02 13:19:03,745 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 153 transitions. Word has length 146 [2021-05-02 13:19:03,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:03,745 INFO L480 AbstractCegarLoop]: Abstraction has 151 states and 153 transitions. [2021-05-02 13:19:03,745 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 3.025) internal successors, (121), 39 states have internal predecessors, (121), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:03,745 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 153 transitions. [2021-05-02 13:19:03,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-05-02 13:19:03,746 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:03,746 INFO L523 BasicCegarLoop]: trace histogram [46, 46, 36, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:03,960 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:03,961 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:03,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:03,961 INFO L82 PathProgramCache]: Analyzing trace with hash -670713308, now seen corresponding path program 26 times [2021-05-02 13:19:03,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:03,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [101081566] [2021-05-02 13:19:03,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:03,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:05,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:05,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:05,091 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1063 proven. 1962 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 13:19:05,091 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:05,091 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [101081566] [2021-05-02 13:19:05,091 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [101081566] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:05,091 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1629473849] [2021-05-02 13:19:05,091 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 13:19:05,155 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:19:05,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:19:05,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 75 conjunts are in the unsatisfiable core [2021-05-02 13:19:05,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:19:05,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:05,506 INFO L134 CoverageAnalysis]: Checked inductivity of 3151 backedges. 1063 proven. 1962 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 13:19:05,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1629473849] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:05,506 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:19:05,506 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 39] total 41 [2021-05-02 13:19:05,507 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611022272] [2021-05-02 13:19:05,507 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 13:19:05,507 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:05,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 13:19:05,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 13:19:05,508 INFO L87 Difference]: Start difference. First operand 151 states and 153 transitions. Second operand has 41 states, 41 states have (on average 3.024390243902439) internal successors, (124), 40 states have internal predecessors, (124), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:09,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:09,312 INFO L93 Difference]: Finished difference Result 193 states and 198 transitions. [2021-05-02 13:19:09,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-05-02 13:19:09,313 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.024390243902439) internal successors, (124), 40 states have internal predecessors, (124), 2 states have call successors, (4), 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 13:19:09,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:09,314 INFO L225 Difference]: With dead ends: 193 [2021-05-02 13:19:09,314 INFO L226 Difference]: Without dead ends: 155 [2021-05-02 13:19:09,314 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 670 ImplicationChecksByTransitivity, 2667.8ms TimeCoverageRelationStatistics Valid=301, Invalid=5705, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 13:19:09,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-02 13:19:09,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2021-05-02 13:19:09,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 149 states have (on average 1.0201342281879195) internal successors, (152), 149 states have internal predecessors, (152), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:09,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 156 transitions. [2021-05-02 13:19:09,324 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 156 transitions. Word has length 149 [2021-05-02 13:19:09,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:09,324 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 156 transitions. [2021-05-02 13:19:09,324 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 3.024390243902439) internal successors, (124), 40 states have internal predecessors, (124), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:09,324 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 156 transitions. [2021-05-02 13:19:09,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-05-02 13:19:09,325 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:09,325 INFO L523 BasicCegarLoop]: trace histogram [47, 47, 37, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:09,540 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 13:19:09,541 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:09,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:09,541 INFO L82 PathProgramCache]: Analyzing trace with hash 1294972172, now seen corresponding path program 27 times [2021-05-02 13:19:09,541 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:09,541 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1648528398] [2021-05-02 13:19:09,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:09,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:10,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:10,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:10,634 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1092 proven. 2072 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 13:19:10,634 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:10,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1648528398] [2021-05-02 13:19:10,634 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1648528398] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:10,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405434369] [2021-05-02 13:19:10,634 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 13:19:11,637 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-05-02 13:19:11,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:19:11,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 13:19:11,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:19:11,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:14,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:14,899 INFO L134 CoverageAnalysis]: Checked inductivity of 3290 backedges. 1173 proven. 155 refuted. 0 times theorem prover too weak. 1962 trivial. 0 not checked. [2021-05-02 13:19:14,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405434369] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:14,899 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:19:14,899 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 16] total 55 [2021-05-02 13:19:14,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718095647] [2021-05-02 13:19:14,900 INFO L460 AbstractCegarLoop]: Interpolant automaton has 55 states [2021-05-02 13:19:14,900 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:14,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-05-02 13:19:14,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=2812, Unknown=0, NotChecked=0, Total=2970 [2021-05-02 13:19:14,901 INFO L87 Difference]: Start difference. First operand 154 states and 156 transitions. Second operand has 55 states, 55 states have (on average 2.9272727272727272) internal successors, (161), 54 states have internal predecessors, (161), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:25,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:25,147 INFO L93 Difference]: Finished difference Result 203 states and 211 transitions. [2021-05-02 13:19:25,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2021-05-02 13:19:25,148 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.9272727272727272) internal successors, (161), 54 states have internal predecessors, (161), 2 states have call successors, (4), 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 152 [2021-05-02 13:19:25,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:25,149 INFO L225 Difference]: With dead ends: 203 [2021-05-02 13:19:25,149 INFO L226 Difference]: Without dead ends: 165 [2021-05-02 13:19:25,150 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 129 SyntacticMatches, 13 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1440 ImplicationChecksByTransitivity, 8928.3ms TimeCoverageRelationStatistics Valid=739, Invalid=10817, Unknown=0, NotChecked=0, Total=11556 [2021-05-02 13:19:25,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2021-05-02 13:19:25,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 163. [2021-05-02 13:19:25,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.018987341772152) internal successors, (161), 158 states have internal predecessors, (161), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:25,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 165 transitions. [2021-05-02 13:19:25,160 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 165 transitions. Word has length 152 [2021-05-02 13:19:25,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:25,160 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 165 transitions. [2021-05-02 13:19:25,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 55 states, 55 states have (on average 2.9272727272727272) internal successors, (161), 54 states have internal predecessors, (161), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:25,160 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 165 transitions. [2021-05-02 13:19:25,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-02 13:19:25,161 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:25,161 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 39, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:25,361 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:19:25,362 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:25,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:25,362 INFO L82 PathProgramCache]: Analyzing trace with hash 51331362, now seen corresponding path program 28 times [2021-05-02 13:19:25,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:25,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594671355] [2021-05-02 13:19:25,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:25,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:26,635 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:26,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:26,650 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1269 proven. 2301 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 13:19:26,650 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:26,650 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594671355] [2021-05-02 13:19:26,650 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1594671355] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:26,651 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [8156672] [2021-05-02 13:19:26,651 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 13:19:26,715 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:19:26,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:19:26,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 81 conjunts are in the unsatisfiable core [2021-05-02 13:19:26,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:19:26,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:19:27,050 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 1269 proven. 2301 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 13:19:27,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [8156672] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:27,051 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:19:27,051 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42] total 44 [2021-05-02 13:19:27,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157763906] [2021-05-02 13:19:27,051 INFO L460 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-05-02 13:19:27,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:19:27,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-05-02 13:19:27,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=1767, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 13:19:27,052 INFO L87 Difference]: Start difference. First operand 163 states and 165 transitions. Second operand has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 43 states have internal predecessors, (133), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:31,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:19:31,319 INFO L93 Difference]: Finished difference Result 208 states and 213 transitions. [2021-05-02 13:19:31,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 13:19:31,320 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 43 states have internal predecessors, (133), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 161 [2021-05-02 13:19:31,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:19:31,321 INFO L225 Difference]: With dead ends: 208 [2021-05-02 13:19:31,321 INFO L226 Difference]: Without dead ends: 167 [2021-05-02 13:19:31,322 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 163 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 2924.5ms TimeCoverageRelationStatistics Valid=325, Invalid=6647, Unknown=0, NotChecked=0, Total=6972 [2021-05-02 13:19:31,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-02 13:19:31,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2021-05-02 13:19:31,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.0186335403726707) internal successors, (164), 161 states have internal predecessors, (164), 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 13:19:31,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 168 transitions. [2021-05-02 13:19:31,331 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 168 transitions. Word has length 161 [2021-05-02 13:19:31,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:19:31,331 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 168 transitions. [2021-05-02 13:19:31,331 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 44 states, 44 states have (on average 3.022727272727273) internal successors, (133), 43 states have internal predecessors, (133), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:19:31,331 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 168 transitions. [2021-05-02 13:19:31,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-05-02 13:19:31,332 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:19:31,332 INFO L523 BasicCegarLoop]: trace histogram [51, 51, 40, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:19:31,555 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 13:19:31,555 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:19:31,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:19:31,555 INFO L82 PathProgramCache]: Analyzing trace with hash 500178954, now seen corresponding path program 29 times [2021-05-02 13:19:31,556 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:19:31,556 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170049818] [2021-05-02 13:19:31,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:19:31,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:32,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:19:32,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:19:32,788 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1301 proven. 2420 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 13:19:32,788 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:19:32,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170049818] [2021-05-02 13:19:32,788 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170049818] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:19:32,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820349479] [2021-05-02 13:19:32,788 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 13:21:49,951 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 52 check-sat command(s) [2021-05-02 13:21:49,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:21:49,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 127 conjunts are in the unsatisfiable core [2021-05-02 13:21:49,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:21:53,417 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1301 proven. 2420 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 13:21:53,417 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1820349479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:21:53,417 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:21:53,417 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 45] total 64 [2021-05-02 13:21:53,418 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1475251786] [2021-05-02 13:21:53,418 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 13:21:53,418 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:21:53,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 13:21:53,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=3828, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 13:21:53,419 INFO L87 Difference]: Start difference. First operand 166 states and 168 transitions. Second operand has 64 states, 64 states have (on average 2.953125) internal successors, (189), 63 states have internal predecessors, (189), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:21:59,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:21:59,525 INFO L93 Difference]: Finished difference Result 211 states and 216 transitions. [2021-05-02 13:21:59,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 13:21:59,525 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.953125) internal successors, (189), 63 states have internal predecessors, (189), 2 states have call successors, (4), 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 164 [2021-05-02 13:21:59,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:21:59,526 INFO L225 Difference]: With dead ends: 211 [2021-05-02 13:21:59,527 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 13:21:59,527 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 111 SyntacticMatches, 37 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2150 ImplicationChecksByTransitivity, 6564.0ms TimeCoverageRelationStatistics Valid=440, Invalid=10902, Unknown=0, NotChecked=0, Total=11342 [2021-05-02 13:21:59,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 13:21:59,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2021-05-02 13:21:59,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:21:59,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2021-05-02 13:21:59,538 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 164 [2021-05-02 13:21:59,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:21:59,539 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2021-05-02 13:21:59,539 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 2.953125) internal successors, (189), 63 states have internal predecessors, (189), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:21:59,539 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2021-05-02 13:21:59,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-02 13:21:59,540 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:21:59,540 INFO L523 BasicCegarLoop]: trace histogram [52, 52, 41, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:21:59,749 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-05-02 13:21:59,749 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:21:59,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:21:59,750 INFO L82 PathProgramCache]: Analyzing trace with hash 1885599778, now seen corresponding path program 30 times [2021-05-02 13:21:59,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:21:59,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531327447] [2021-05-02 13:21:59,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:21:59,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:22:00,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:22:00,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:22:00,972 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1333 proven. 2542 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 13:22:00,972 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:22:00,972 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531327447] [2021-05-02 13:22:00,972 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531327447] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:22:00,972 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596076341] [2021-05-02 13:22:00,973 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 13:22:04,253 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 37 check-sat command(s) [2021-05-02 13:22:04,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:22:04,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 13:22:04,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:22:04,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:22:04,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:22:04,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:22:06,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:22:06,718 INFO L134 CoverageAnalysis]: Checked inductivity of 4030 backedges. 1423 proven. 187 refuted. 0 times theorem prover too weak. 2420 trivial. 0 not checked. [2021-05-02 13:22:06,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596076341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:22:06,718 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:22:06,719 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 17] total 60 [2021-05-02 13:22:06,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494070537] [2021-05-02 13:22:06,721 INFO L460 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-05-02 13:22:06,721 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:22:06,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-05-02 13:22:06,721 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=3367, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 13:22:06,722 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand has 60 states, 60 states have (on average 2.933333333333333) internal successors, (176), 59 states have internal predecessors, (176), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:22:14,798 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 38 [2021-05-02 13:22:18,827 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 38 [2021-05-02 13:22:20,748 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 48 [2021-05-02 13:22:21,618 WARN L205 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 43 [2021-05-02 13:22:22,348 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 45 [2021-05-02 13:22:23,841 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 43 [2021-05-02 13:22:26,070 WARN L205 SmtUtils]: Spent 375.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 45 [2021-05-02 13:22:29,314 WARN L205 SmtUtils]: Spent 722.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 45 [2021-05-02 13:22:32,809 WARN L205 SmtUtils]: Spent 336.00 ms on a formula simplification. DAG size of input: 87 DAG size of output: 45 [2021-05-02 13:22:36,136 WARN L205 SmtUtils]: Spent 480.00 ms on a formula simplification. DAG size of input: 83 DAG size of output: 45 [2021-05-02 13:22:38,530 WARN L205 SmtUtils]: Spent 413.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 45 [2021-05-02 13:22:41,027 WARN L205 SmtUtils]: Spent 385.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 45 [2021-05-02 13:22:42,993 WARN L205 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 45 [2021-05-02 13:22:44,911 WARN L205 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 45 [2021-05-02 13:22:45,824 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2021-05-02 13:22:49,126 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 43 [2021-05-02 13:22:50,042 WARN L205 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 43 [2021-05-02 13:22:50,561 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2021-05-02 13:22:51,246 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 43 [2021-05-02 13:22:52,004 WARN L205 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 45 [2021-05-02 13:22:52,891 WARN L205 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 43 [2021-05-02 13:22:53,708 WARN L205 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2021-05-02 13:22:54,530 WARN L205 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 43 [2021-05-02 13:22:54,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:22:54,532 INFO L93 Difference]: Finished difference Result 245 states and 261 transitions. [2021-05-02 13:22:54,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-02 13:22:54,532 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.933333333333333) internal successors, (176), 59 states have internal predecessors, (176), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 167 [2021-05-02 13:22:54,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:22:54,533 INFO L225 Difference]: With dead ends: 245 [2021-05-02 13:22:54,533 INFO L226 Difference]: Without dead ends: 204 [2021-05-02 13:22:54,533 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 151 SyntacticMatches, 5 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2650 ImplicationChecksByTransitivity, 46632.0ms TimeCoverageRelationStatistics Valid=2092, Invalid=15730, Unknown=0, NotChecked=0, Total=17822 [2021-05-02 13:22:54,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-05-02 13:22:54,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 178. [2021-05-02 13:22:54,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 173 states have (on average 1.0173410404624277) internal successors, (176), 173 states have internal predecessors, (176), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:22:54,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 180 transitions. [2021-05-02 13:22:54,546 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 180 transitions. Word has length 167 [2021-05-02 13:22:54,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:22:54,546 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 180 transitions. [2021-05-02 13:22:54,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 60 states, 60 states have (on average 2.933333333333333) internal successors, (176), 59 states have internal predecessors, (176), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:22:54,546 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 180 transitions. [2021-05-02 13:22:54,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-05-02 13:22:54,547 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:22:54,547 INFO L523 BasicCegarLoop]: trace histogram [55, 55, 43, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:22:54,752 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 13:22:54,752 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:22:54,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:22:54,753 INFO L82 PathProgramCache]: Analyzing trace with hash 905531468, now seen corresponding path program 31 times [2021-05-02 13:22:54,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:22:54,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820190412] [2021-05-02 13:22:54,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:22:54,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:22:56,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:22:56,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:22:56,394 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1528 proven. 2795 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 13:22:56,395 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:22:56,395 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820190412] [2021-05-02 13:22:56,395 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [820190412] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:22:56,395 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2053748136] [2021-05-02 13:22:56,395 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 13:22:56,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:22:56,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 89 conjunts are in the unsatisfiable core [2021-05-02 13:22:56,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:22:56,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:22:56,965 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1528 proven. 2795 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 13:22:56,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2053748136] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:22:56,965 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:22:56,966 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46] total 48 [2021-05-02 13:22:56,966 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644409662] [2021-05-02 13:22:56,966 INFO L460 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-05-02 13:22:56,966 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:22:56,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-05-02 13:22:56,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:22:56,967 INFO L87 Difference]: Start difference. First operand 178 states and 180 transitions. Second operand has 48 states, 48 states have (on average 3.0208333333333335) internal successors, (145), 47 states have internal predecessors, (145), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:23:03,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:23:03,299 INFO L93 Difference]: Finished difference Result 226 states and 231 transitions. [2021-05-02 13:23:03,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2021-05-02 13:23:03,300 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 3.0208333333333335) internal successors, (145), 47 states have internal predecessors, (145), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 176 [2021-05-02 13:23:03,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:23:03,301 INFO L225 Difference]: With dead ends: 226 [2021-05-02 13:23:03,301 INFO L226 Difference]: Without dead ends: 182 [2021-05-02 13:23:03,302 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 3948.4ms TimeCoverageRelationStatistics Valid=357, Invalid=8015, Unknown=0, NotChecked=0, Total=8372 [2021-05-02 13:23:03,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-05-02 13:23:03,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 181. [2021-05-02 13:23:03,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0170454545454546) internal successors, (179), 176 states have internal predecessors, (179), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:23:03,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2021-05-02 13:23:03,314 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 176 [2021-05-02 13:23:03,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:23:03,314 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2021-05-02 13:23:03,314 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 48 states, 48 states have (on average 3.0208333333333335) internal successors, (145), 47 states have internal predecessors, (145), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:23:03,314 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2021-05-02 13:23:03,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-02 13:23:03,315 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:23:03,315 INFO L523 BasicCegarLoop]: trace histogram [56, 56, 44, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:23:03,537 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 13:23:03,537 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:23:03,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:23:03,537 INFO L82 PathProgramCache]: Analyzing trace with hash 768722020, now seen corresponding path program 32 times [2021-05-02 13:23:03,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:23:03,538 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [122995744] [2021-05-02 13:23:03,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:23:03,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:23:05,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:23:05,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:23:05,233 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1563 proven. 2926 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 13:23:05,234 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:23:05,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [122995744] [2021-05-02 13:23:05,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [122995744] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:23:05,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2116907278] [2021-05-02 13:23:05,234 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 13:23:05,323 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:23:05,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:23:05,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 91 conjunts are in the unsatisfiable core [2021-05-02 13:23:05,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:23:05,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:23:05,907 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1563 proven. 2926 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 13:23:05,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2116907278] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:23:05,908 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:23:05,908 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 47] total 49 [2021-05-02 13:23:05,908 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476443852] [2021-05-02 13:23:05,908 INFO L460 AbstractCegarLoop]: Interpolant automaton has 49 states [2021-05-02 13:23:05,908 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:23:05,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-05-02 13:23:05,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=2212, Unknown=0, NotChecked=0, Total=2352 [2021-05-02 13:23:05,909 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:23:12,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:23:12,430 INFO L93 Difference]: Finished difference Result 229 states and 234 transitions. [2021-05-02 13:23:12,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-05-02 13:23:12,431 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 179 [2021-05-02 13:23:12,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:23:12,432 INFO L225 Difference]: With dead ends: 229 [2021-05-02 13:23:12,432 INFO L226 Difference]: Without dead ends: 185 [2021-05-02 13:23:12,433 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 181 SyntacticMatches, 1 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 994 ImplicationChecksByTransitivity, 4101.4ms TimeCoverageRelationStatistics Valid=365, Invalid=8377, Unknown=0, NotChecked=0, Total=8742 [2021-05-02 13:23:12,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-05-02 13:23:12,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2021-05-02 13:23:12,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 184 states, 179 states have (on average 1.0167597765363128) internal successors, (182), 179 states have internal predecessors, (182), 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 13:23:12,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 186 transitions. [2021-05-02 13:23:12,446 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 186 transitions. Word has length 179 [2021-05-02 13:23:12,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:23:12,446 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 186 transitions. [2021-05-02 13:23:12,446 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 49 states, 49 states have (on average 3.020408163265306) internal successors, (148), 48 states have internal predecessors, (148), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:23:12,446 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 186 transitions. [2021-05-02 13:23:12,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-05-02 13:23:12,447 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:23:12,447 INFO L523 BasicCegarLoop]: trace histogram [57, 57, 45, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:23:12,660 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 13:23:12,661 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:23:12,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:23:12,661 INFO L82 PathProgramCache]: Analyzing trace with hash 1002420556, now seen corresponding path program 33 times [2021-05-02 13:23:12,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:23:12,661 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538180521] [2021-05-02 13:23:12,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:23:12,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:23:14,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:23:14,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:23:14,414 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1598 proven. 3060 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2021-05-02 13:23:14,414 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:23:14,414 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538180521] [2021-05-02 13:23:14,414 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [538180521] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:23:14,414 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1461604466] [2021-05-02 13:23:14,414 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 13:23:15,424 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-05-02 13:23:15,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:23:15,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 13:23:15,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:23:19,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:23:19,317 INFO L134 CoverageAnalysis]: Checked inductivity of 4845 backedges. 1697 proven. 222 refuted. 0 times theorem prover too weak. 2926 trivial. 0 not checked. [2021-05-02 13:23:19,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1461604466] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:23:19,317 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:23:19,318 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 18] total 65 [2021-05-02 13:23:19,318 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721327814] [2021-05-02 13:23:19,318 INFO L460 AbstractCegarLoop]: Interpolant automaton has 65 states [2021-05-02 13:23:19,318 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:23:19,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-05-02 13:23:19,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=3972, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 13:23:19,319 INFO L87 Difference]: Start difference. First operand 184 states and 186 transitions. Second operand has 65 states, 65 states have (on average 2.9384615384615387) internal successors, (191), 64 states have internal predecessors, (191), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:23:44,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:23:44,199 INFO L93 Difference]: Finished difference Result 242 states and 251 transitions. [2021-05-02 13:23:44,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2021-05-02 13:23:44,200 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 2.9384615384615387) internal successors, (191), 64 states have internal predecessors, (191), 2 states have call successors, (4), 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 182 [2021-05-02 13:23:44,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:23:44,201 INFO L225 Difference]: With dead ends: 242 [2021-05-02 13:23:44,201 INFO L226 Difference]: Without dead ends: 198 [2021-05-02 13:23:44,202 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 166 SyntacticMatches, 4 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2129 ImplicationChecksByTransitivity, 18378.5ms TimeCoverageRelationStatistics Valid=1051, Invalid=15719, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 13:23:44,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-05-02 13:23:44,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 193. [2021-05-02 13:23:44,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:23:44,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2021-05-02 13:23:44,222 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 182 [2021-05-02 13:23:44,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:23:44,223 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2021-05-02 13:23:44,223 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 65 states, 65 states have (on average 2.9384615384615387) internal successors, (191), 64 states have internal predecessors, (191), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:23:44,223 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2021-05-02 13:23:44,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-02 13:23:44,224 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:23:44,224 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 47, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:23:44,428 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 13:23:44,429 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:23:44,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:23:44,429 INFO L82 PathProgramCache]: Analyzing trace with hash -1478257438, now seen corresponding path program 34 times [2021-05-02 13:23:44,429 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:23:44,429 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995090664] [2021-05-02 13:23:44,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:23:44,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:23:46,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:23:46,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:23:46,690 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1811 proven. 3337 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-05-02 13:23:46,691 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:23:46,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995090664] [2021-05-02 13:23:46,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1995090664] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:23:46,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [765447861] [2021-05-02 13:23:46,691 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 13:23:46,755 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:23:46,756 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:23:46,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 97 conjunts are in the unsatisfiable core [2021-05-02 13:23:46,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:23:47,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:23:47,487 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1811 proven. 3337 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-05-02 13:23:47,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [765447861] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:23:47,488 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:23:47,488 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50] total 52 [2021-05-02 13:23:47,488 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740503308] [2021-05-02 13:23:47,489 INFO L460 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-05-02 13:23:47,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:23:47,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-05-02 13:23:47,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2503, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 13:23:47,489 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:23:56,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:23:56,832 INFO L93 Difference]: Finished difference Result 244 states and 249 transitions. [2021-05-02 13:23:56,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 13:23:56,833 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 191 [2021-05-02 13:23:56,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:23:56,834 INFO L225 Difference]: With dead ends: 244 [2021-05-02 13:23:56,834 INFO L226 Difference]: Without dead ends: 197 [2021-05-02 13:23:56,835 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 292 GetRequests, 193 SyntacticMatches, 1 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1132 ImplicationChecksByTransitivity, 5539.5ms TimeCoverageRelationStatistics Valid=389, Invalid=9511, Unknown=0, NotChecked=0, Total=9900 [2021-05-02 13:23:56,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2021-05-02 13:23:56,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 196. [2021-05-02 13:23:56,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 191 states have (on average 1.0157068062827226) internal successors, (194), 191 states have internal predecessors, (194), 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 13:23:56,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2021-05-02 13:23:56,850 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 191 [2021-05-02 13:23:56,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:23:56,850 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2021-05-02 13:23:56,850 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 52 states, 52 states have (on average 3.019230769230769) internal successors, (157), 51 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:23:56,850 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2021-05-02 13:23:56,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-05-02 13:23:56,851 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:23:56,851 INFO L523 BasicCegarLoop]: trace histogram [61, 61, 48, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:23:57,068 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 13:23:57,068 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:23:57,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:23:57,069 INFO L82 PathProgramCache]: Analyzing trace with hash 1128361418, now seen corresponding path program 35 times [2021-05-02 13:23:57,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:23:57,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43566260] [2021-05-02 13:23:57,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:23:57,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:23:59,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:23:59,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:23:59,338 INFO L134 CoverageAnalysis]: Checked inductivity of 5551 backedges. 1849 proven. 3480 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-05-02 13:23:59,339 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:23:59,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43566260] [2021-05-02 13:23:59,339 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [43566260] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:23:59,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958416935] [2021-05-02 13:23:59,339 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