/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/loop-acceleration/nested_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 12:12:04,075 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 12:12:04,079 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 12:12:04,107 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 12:12:04,122 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 12:12:04,124 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 12:12:04,125 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 12:12:04,126 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 12:12:04,128 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 12:12:04,128 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 12:12:04,130 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 12:12:04,134 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 12:12:04,135 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 12:12:04,137 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 12:12:04,137 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 12:12:04,139 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 12:12:04,142 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 12:12:04,148 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 12:12:04,148 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 12:12:04,149 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 12:12:04,152 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 12:12:04,180 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 12:12:04,180 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 12:12:04,182 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 12:12:04,182 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 12:12:04,182 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 12:12:04,182 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 12:12:04,182 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 12:12:04,183 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 12:12:04,183 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 12:12:04,183 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 12:12:04,183 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 12:12:04,184 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 12:12:04,184 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 12:12:04,184 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 12:12:04,184 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 12:12:04,184 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 12:12:04,184 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 12:12:04,184 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 12:12:04,184 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 12:12:04,184 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 12:12:04,185 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 12:12:04,185 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 12:12:04,185 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 12:12:04,185 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 12:12:04,185 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 12:12:04,185 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 12:12:04,185 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 12:12:04,185 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 12:12:04,185 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 12:12:04,447 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 12:12:04,465 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 12:12:04,466 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 12:12:04,467 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 12:12:04,468 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 12:12:04,469 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/nested_1-2.c [2021-05-02 12:12:04,520 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e2185532c/6d188c7725314b4e8b501c27e2bf3525/FLAG1fa05da25 [2021-05-02 12:12:04,905 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 12:12:04,906 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-2.c [2021-05-02 12:12:04,910 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e2185532c/6d188c7725314b4e8b501c27e2bf3525/FLAG1fa05da25 [2021-05-02 12:12:04,925 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e2185532c/6d188c7725314b4e8b501c27e2bf3525 [2021-05-02 12:12:04,927 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 12:12:04,929 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 12:12:04,932 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 12:12:04,932 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 12:12:04,935 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 12:12:04,935 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:12:04" (1/1) ... [2021-05-02 12:12:04,936 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5cbc89b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:12:04, skipping insertion in model container [2021-05-02 12:12:04,936 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 12:12:04" (1/1) ... [2021-05-02 12:12:04,941 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 12:12:04,951 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 12:12:05,066 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-2.c[322,335] [2021-05-02 12:12:05,075 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:12:05,082 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 12:12:05,090 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/nested_1-2.c[322,335] [2021-05-02 12:12:05,092 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 12:12:05,103 INFO L208 MainTranslator]: Completed translation [2021-05-02 12:12:05,103 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:12:05 WrapperNode [2021-05-02 12:12:05,103 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 12:12:05,104 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 12:12:05,104 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 12:12:05,105 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 12:12:05,146 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:12:05" (1/1) ... [2021-05-02 12:12:05,146 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:12:05" (1/1) ... [2021-05-02 12:12:05,152 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:12:05" (1/1) ... [2021-05-02 12:12:05,152 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:12:05" (1/1) ... [2021-05-02 12:12:05,162 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:12:05" (1/1) ... [2021-05-02 12:12:05,165 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:12:05" (1/1) ... [2021-05-02 12:12:05,166 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:12:05" (1/1) ... [2021-05-02 12:12:05,171 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 12:12:05,172 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 12:12:05,172 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 12:12:05,172 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 12:12:05,173 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:12:05" (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 12:12:05,243 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 12:12:05,243 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 12:12:05,243 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 12:12:05,243 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 12:12:05,243 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 12:12:05,243 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 12:12:05,244 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 12:12:05,244 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 12:12:05,244 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 12:12:05,244 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 12:12:05,244 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 12:12:05,244 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 12:12:05,245 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 12:12:05,245 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 12:12:05,245 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 12:12:05,246 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 12:12:05,246 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 12:12:05,433 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 12:12:05,433 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 12:12:05,434 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:12:05 BoogieIcfgContainer [2021-05-02 12:12:05,434 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 12:12:05,435 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 12:12:05,435 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 12:12:05,437 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 12:12:05,437 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 12:12:04" (1/3) ... [2021-05-02 12:12:05,438 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@138f79ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:12:05, skipping insertion in model container [2021-05-02 12:12:05,438 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 12:12:05" (2/3) ... [2021-05-02 12:12:05,438 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@138f79ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 12:12:05, skipping insertion in model container [2021-05-02 12:12:05,438 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 12:12:05" (3/3) ... [2021-05-02 12:12:05,439 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1-2.c [2021-05-02 12:12:05,443 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 12:12:05,449 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 12:12:05,463 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 12:12:05,490 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 12:12:05,490 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 12:12:05,490 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 12:12:05,491 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 12:12:05,491 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 12:12:05,491 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 12:12:05,496 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 12:12:05,497 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 12:12:05,513 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 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 12:12:05,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 12:12:05,516 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:05,516 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:05,517 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:05,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:05,520 INFO L82 PathProgramCache]: Analyzing trace with hash 2021311625, now seen corresponding path program 1 times [2021-05-02 12:12:05,525 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:05,526 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987005893] [2021-05-02 12:12:05,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:05,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:05,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:05,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:05,712 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 12:12:05,712 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:05,712 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987005893] [2021-05-02 12:12:05,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [987005893] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:12:05,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:12:05,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:12:05,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672819065] [2021-05-02 12:12:05,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:12:05,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:05,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:12:05,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:12:05,725 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.5) internal successors, (18), 13 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 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 12:12:05,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:05,827 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2021-05-02 12:12:05,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:12:05,829 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 12:12:05,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:05,832 INFO L225 Difference]: With dead ends: 37 [2021-05-02 12:12:05,833 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 12:12:05,835 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 53.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:12:05,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 12:12:05,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 15. [2021-05-02 12:12:05,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:05,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-05-02 12:12:05,862 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-05-02 12:12:05,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:05,863 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-05-02 12:12:05,863 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 12:12:05,863 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-05-02 12:12:05,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 12:12:05,864 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:05,864 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:05,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 12:12:05,865 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:05,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:05,865 INFO L82 PathProgramCache]: Analyzing trace with hash -2037585725, now seen corresponding path program 1 times [2021-05-02 12:12:05,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:05,866 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [270399747] [2021-05-02 12:12:05,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:05,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:05,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:05,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:05,955 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:12:05,955 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:05,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [270399747] [2021-05-02 12:12:05,955 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [270399747] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 12:12:05,955 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 12:12:05,955 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 12:12:05,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819720301] [2021-05-02 12:12:05,956 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 12:12:05,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:05,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 12:12:05,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 12:12:05,957 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:06,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:06,024 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2021-05-02 12:12:06,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 12:12:06,025 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 12:12:06,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:06,026 INFO L225 Difference]: With dead ends: 24 [2021-05-02 12:12:06,027 INFO L226 Difference]: Without dead ends: 16 [2021-05-02 12:12:06,028 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 59.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 12:12:06,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-02 12:12:06,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-02 12:12:06,040 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 12:12:06,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 12:12:06,041 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2021-05-02 12:12:06,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:06,041 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 12:12:06,041 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:06,042 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 12:12:06,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 12:12:06,042 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:06,043 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:06,043 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 12:12:06,043 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:06,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:06,044 INFO L82 PathProgramCache]: Analyzing trace with hash -183414982, now seen corresponding path program 1 times [2021-05-02 12:12:06,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:06,045 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746992692] [2021-05-02 12:12:06,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:06,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:06,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:06,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:06,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:12:06,154 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:06,154 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746992692] [2021-05-02 12:12:06,154 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1746992692] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:06,158 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283491670] [2021-05-02 12:12:06,159 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 12:12:06,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:06,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 12:12:06,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:06,280 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 12:12:06,281 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1283491670] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:06,281 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:06,281 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-05-02 12:12:06,281 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603784660] [2021-05-02 12:12:06,281 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:12:06,282 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:06,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:12:06,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:12:06,282 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:06,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:06,526 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2021-05-02 12:12:06,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:12:06,526 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 12:12:06,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:06,527 INFO L225 Difference]: With dead ends: 35 [2021-05-02 12:12:06,527 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 12:12:06,529 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 221.4ms TimeCoverageRelationStatistics Valid=70, Invalid=170, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:12:06,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 12:12:06,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2021-05-02 12:12:06,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:06,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-05-02 12:12:06,541 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2021-05-02 12:12:06,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:06,542 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-05-02 12:12:06,542 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:06,542 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-05-02 12:12:06,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 12:12:06,543 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:06,544 INFO L523 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:06,749 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 12:12:06,749 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:06,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:06,750 INFO L82 PathProgramCache]: Analyzing trace with hash -1053252407, now seen corresponding path program 2 times [2021-05-02 12:12:06,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:06,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829683141] [2021-05-02 12:12:06,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:06,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:06,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:06,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:06,852 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 12:12:06,853 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:06,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829683141] [2021-05-02 12:12:06,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1829683141] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:06,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1737137837] [2021-05-02 12:12:06,853 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 12:12:06,906 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:12:06,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:06,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 12:12:06,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:07,001 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 12:12:07,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1737137837] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:07,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:07,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2021-05-02 12:12:07,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335092656] [2021-05-02 12:12:07,002 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:12:07,002 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:07,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:12:07,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:12:07,003 INFO L87 Difference]: Start difference. First operand 22 states and 24 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 12:12:07,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:07,453 INFO L93 Difference]: Finished difference Result 47 states and 57 transitions. [2021-05-02 12:12:07,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:12:07,454 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 21 [2021-05-02 12:12:07,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:07,454 INFO L225 Difference]: With dead ends: 47 [2021-05-02 12:12:07,455 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 12:12:07,455 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 400.2ms TimeCoverageRelationStatistics Valid=126, Invalid=426, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:12:07,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 12:12:07,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2021-05-02 12:12:07,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:07,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2021-05-02 12:12:07,465 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 21 [2021-05-02 12:12:07,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:07,465 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2021-05-02 12:12:07,465 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 12:12:07,465 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2021-05-02 12:12:07,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 12:12:07,466 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:07,466 INFO L523 BasicCegarLoop]: trace histogram [9, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:07,680 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:07,681 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:07,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:07,681 INFO L82 PathProgramCache]: Analyzing trace with hash 1297906108, now seen corresponding path program 3 times [2021-05-02 12:12:07,682 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:07,682 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390251260] [2021-05-02 12:12:07,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:07,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:07,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:07,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:07,772 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 35 proven. 6 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-05-02 12:12:07,772 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:07,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390251260] [2021-05-02 12:12:07,772 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [390251260] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:07,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713303043] [2021-05-02 12:12:07,773 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 12:12:07,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-05-02 12:12:07,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:07,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 12:12:07,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:07,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:07,939 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 37 proven. 6 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-05-02 12:12:07,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [713303043] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:07,939 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:07,940 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 12:12:07,940 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507594979] [2021-05-02 12:12:07,940 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 12:12:07,940 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:07,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 12:12:07,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 12:12:07,941 INFO L87 Difference]: Start difference. First operand 30 states and 33 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 12:12:08,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:08,064 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2021-05-02 12:12:08,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 12:12:08,064 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 29 [2021-05-02 12:12:08,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:08,065 INFO L225 Difference]: With dead ends: 52 [2021-05-02 12:12:08,065 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 12:12:08,065 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 114.3ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:12:08,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 12:12:08,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-02 12:12:08,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:08,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2021-05-02 12:12:08,070 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 29 [2021-05-02 12:12:08,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:08,071 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2021-05-02 12:12:08,071 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 12:12:08,071 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2021-05-02 12:12:08,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 12:12:08,071 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:08,071 INFO L523 BasicCegarLoop]: trace histogram [12, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:08,286 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:08,286 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:08,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:08,287 INFO L82 PathProgramCache]: Analyzing trace with hash 1377436611, now seen corresponding path program 4 times [2021-05-02 12:12:08,287 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:08,287 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926074479] [2021-05-02 12:12:08,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:08,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:08,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:08,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:08,401 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 53 proven. 10 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-05-02 12:12:08,401 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:08,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926074479] [2021-05-02 12:12:08,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926074479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:08,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [930937693] [2021-05-02 12:12:08,401 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:08,451 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:12:08,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:08,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 12:12:08,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:08,505 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:08,523 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 53 proven. 10 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2021-05-02 12:12:08,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [930937693] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:08,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:08,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 12:12:08,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638887965] [2021-05-02 12:12:08,523 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 12:12:08,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:08,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 12:12:08,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-02 12:12:08,524 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:08,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:08,665 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2021-05-02 12:12:08,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:12:08,665 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 12:12:08,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:08,665 INFO L225 Difference]: With dead ends: 57 [2021-05-02 12:12:08,666 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 12:12:08,666 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 138.0ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:12:08,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 12:12:08,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 12:12:08,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 31 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:08,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2021-05-02 12:12:08,671 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 32 [2021-05-02 12:12:08,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:08,671 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2021-05-02 12:12:08,671 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.2222222222222223) internal successors, (20), 8 states have internal predecessors, (20), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:08,671 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2021-05-02 12:12:08,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 12:12:08,672 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:08,672 INFO L523 BasicCegarLoop]: trace histogram [15, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:08,881 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:08,881 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:08,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:08,881 INFO L82 PathProgramCache]: Analyzing trace with hash 48420956, now seen corresponding path program 5 times [2021-05-02 12:12:08,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:08,881 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550319824] [2021-05-02 12:12:08,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:08,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:08,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:08,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:08,973 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 75 proven. 15 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-05-02 12:12:08,973 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:08,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550319824] [2021-05-02 12:12:08,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [550319824] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:08,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571755447] [2021-05-02 12:12:08,973 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:09,000 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 12:12:09,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:09,000 WARN L261 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 12:12:09,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:09,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:09,061 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 114 proven. 15 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-05-02 12:12:09,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571755447] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:09,062 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:09,062 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 12:12:09,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401812574] [2021-05-02 12:12:09,062 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:12:09,062 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:09,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:12:09,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:12:09,063 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:09,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:09,242 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2021-05-02 12:12:09,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:12:09,242 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 35 [2021-05-02 12:12:09,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:09,242 INFO L225 Difference]: With dead ends: 62 [2021-05-02 12:12:09,242 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 12:12:09,243 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 175.3ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:12:09,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 12:12:09,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-02 12:12:09,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 34 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 12:12:09,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2021-05-02 12:12:09,248 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 35 [2021-05-02 12:12:09,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:09,248 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2021-05-02 12:12:09,248 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:09,249 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2021-05-02 12:12:09,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 12:12:09,249 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:09,249 INFO L523 BasicCegarLoop]: trace histogram [18, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:09,466 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 12:12:09,467 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:09,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:09,467 INFO L82 PathProgramCache]: Analyzing trace with hash 1301626915, now seen corresponding path program 6 times [2021-05-02 12:12:09,467 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:09,467 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573401210] [2021-05-02 12:12:09,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:09,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:09,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:09,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:09,575 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 101 proven. 21 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2021-05-02 12:12:09,575 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:09,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573401210] [2021-05-02 12:12:09,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1573401210] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:09,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [721855287] [2021-05-02 12:12:09,575 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:09,681 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2021-05-02 12:12:09,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:09,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 12:12:09,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:09,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:09,773 INFO L134 CoverageAnalysis]: Checked inductivity of 219 backedges. 153 proven. 21 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-05-02 12:12:09,773 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [721855287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:09,773 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:09,773 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 12:12:09,774 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630927592] [2021-05-02 12:12:09,774 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:12:09,774 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:09,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:12:09,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:12:09,775 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 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 12:12:09,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:09,989 INFO L93 Difference]: Finished difference Result 67 states and 75 transitions. [2021-05-02 12:12:09,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:12:09,989 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 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 38 [2021-05-02 12:12:09,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:09,990 INFO L225 Difference]: With dead ends: 67 [2021-05-02 12:12:09,990 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 12:12:09,991 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 207.5ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:12:09,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 12:12:10,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 12:12:10,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.1081081081081081) internal successors, (41), 37 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 12:12:10,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2021-05-02 12:12:10,008 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 38 [2021-05-02 12:12:10,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:10,009 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2021-05-02 12:12:10,009 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 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 12:12:10,009 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2021-05-02 12:12:10,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 12:12:10,011 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:10,012 INFO L523 BasicCegarLoop]: trace histogram [21, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:10,216 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:10,217 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:10,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:10,217 INFO L82 PathProgramCache]: Analyzing trace with hash -249331972, now seen corresponding path program 7 times [2021-05-02 12:12:10,217 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:10,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940276502] [2021-05-02 12:12:10,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:10,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:10,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:10,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:10,334 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 131 proven. 28 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 12:12:10,334 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:10,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940276502] [2021-05-02 12:12:10,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940276502] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:10,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1006762324] [2021-05-02 12:12:10,334 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:10,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:10,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 12:12:10,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:10,438 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:10,467 INFO L134 CoverageAnalysis]: Checked inductivity of 285 backedges. 131 proven. 28 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 12:12:10,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1006762324] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:10,467 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:10,467 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 12:12:10,467 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251801857] [2021-05-02 12:12:10,468 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:12:10,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:10,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:12:10,468 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:12:10,468 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 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 12:12:10,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:10,759 INFO L93 Difference]: Finished difference Result 72 states and 80 transitions. [2021-05-02 12:12:10,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:12:10,759 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 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 41 [2021-05-02 12:12:10,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:10,761 INFO L225 Difference]: With dead ends: 72 [2021-05-02 12:12:10,761 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 12:12:10,762 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 254.0ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:12:10,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 12:12:10,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 12:12:10,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.1) internal successors, (44), 40 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 12:12:10,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2021-05-02 12:12:10,777 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 41 [2021-05-02 12:12:10,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:10,777 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2021-05-02 12:12:10,777 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 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 12:12:10,777 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2021-05-02 12:12:10,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 12:12:10,781 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:10,781 INFO L523 BasicCegarLoop]: trace histogram [24, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:10,996 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:10,996 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:10,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:10,996 INFO L82 PathProgramCache]: Analyzing trace with hash -1922190205, now seen corresponding path program 8 times [2021-05-02 12:12:10,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:10,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885242847] [2021-05-02 12:12:10,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:11,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:11,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:11,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:11,143 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 165 proven. 36 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2021-05-02 12:12:11,143 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:11,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885242847] [2021-05-02 12:12:11,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [885242847] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:11,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806850666] [2021-05-02 12:12:11,144 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 12:12:11,184 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:12:11,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:11,184 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 12:12:11,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:11,289 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 252 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2021-05-02 12:12:11,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [806850666] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:11,289 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:11,289 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 6] total 16 [2021-05-02 12:12:11,290 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816587505] [2021-05-02 12:12:11,290 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 12:12:11,290 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:11,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 12:12:11,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:12:11,290 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 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 12:12:12,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:12,926 INFO L93 Difference]: Finished difference Result 100 states and 113 transitions. [2021-05-02 12:12:12,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-05-02 12:12:12,926 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 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 44 [2021-05-02 12:12:12,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:12,927 INFO L225 Difference]: With dead ends: 100 [2021-05-02 12:12:12,927 INFO L226 Difference]: Without dead ends: 71 [2021-05-02 12:12:12,928 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1154 ImplicationChecksByTransitivity, 1388.1ms TimeCoverageRelationStatistics Valid=453, Invalid=3707, Unknown=0, NotChecked=0, Total=4160 [2021-05-02 12:12:12,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-05-02 12:12:12,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 60. [2021-05-02 12:12:12,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 55 states have internal predecessors, (60), 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 12:12:12,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2021-05-02 12:12:12,934 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 44 [2021-05-02 12:12:12,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:12,934 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2021-05-02 12:12:12,934 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 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 12:12:12,934 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2021-05-02 12:12:12,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 12:12:12,935 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:12,935 INFO L523 BasicCegarLoop]: trace histogram [36, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:13,142 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 12:12:13,142 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:13,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:13,143 INFO L82 PathProgramCache]: Analyzing trace with hash 236877901, now seen corresponding path program 9 times [2021-05-02 12:12:13,143 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:13,143 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376937255] [2021-05-02 12:12:13,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:13,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:13,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:13,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:13,282 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 304 proven. 45 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2021-05-02 12:12:13,283 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:13,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376937255] [2021-05-02 12:12:13,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376937255] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:13,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522975364] [2021-05-02 12:12:13,283 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:13,442 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-05-02 12:12:13,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:13,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 12:12:13,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:13,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:13,545 INFO L134 CoverageAnalysis]: Checked inductivity of 796 backedges. 307 proven. 45 refuted. 0 times theorem prover too weak. 444 trivial. 0 not checked. [2021-05-02 12:12:13,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1522975364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:13,546 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:13,546 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 12:12:13,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146361553] [2021-05-02 12:12:13,546 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 12:12:13,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:13,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 12:12:13,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 12:12:13,547 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:13,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:13,855 INFO L93 Difference]: Finished difference Result 107 states and 118 transitions. [2021-05-02 12:12:13,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 12:12:13,855 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 12:12:13,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:13,856 INFO L225 Difference]: With dead ends: 107 [2021-05-02 12:12:13,856 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 12:12:13,856 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 313.4ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:12:13,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 12:12:13,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-05-02 12:12:13,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0847457627118644) internal successors, (64), 59 states have internal predecessors, (64), 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 12:12:13,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2021-05-02 12:12:13,866 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 59 [2021-05-02 12:12:13,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:13,866 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2021-05-02 12:12:13,866 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:13,866 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2021-05-02 12:12:13,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 12:12:13,866 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:13,867 INFO L523 BasicCegarLoop]: trace histogram [40, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:14,072 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:14,073 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:14,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:14,073 INFO L82 PathProgramCache]: Analyzing trace with hash 538347785, now seen corresponding path program 10 times [2021-05-02 12:12:14,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:14,073 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [122766318] [2021-05-02 12:12:14,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:14,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:14,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:14,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:14,166 INFO L134 CoverageAnalysis]: Checked inductivity of 962 backedges. 0 proven. 742 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-05-02 12:12:14,166 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:14,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [122766318] [2021-05-02 12:12:14,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [122766318] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:14,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748481929] [2021-05-02 12:12:14,166 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:14,201 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:12:14,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:14,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 16 conjunts are in the unsatisfiable core [2021-05-02 12:12:14,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:14,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:14,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:14,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:14,332 INFO L134 CoverageAnalysis]: Checked inductivity of 962 backedges. 0 proven. 742 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2021-05-02 12:12:14,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748481929] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:14,333 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:14,333 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2021-05-02 12:12:14,333 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496711422] [2021-05-02 12:12:14,333 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:12:14,333 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:14,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:12:14,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:12:14,334 INFO L87 Difference]: Start difference. First operand 64 states and 68 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:14,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:14,567 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2021-05-02 12:12:14,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 12:12:14,568 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 63 [2021-05-02 12:12:14,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:14,570 INFO L225 Difference]: With dead ends: 94 [2021-05-02 12:12:14,570 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 12:12:14,571 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 175.9ms TimeCoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:12:14,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 12:12:14,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 77. [2021-05-02 12:12:14,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 72 states have (on average 1.0833333333333333) internal successors, (78), 72 states have internal predecessors, (78), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:14,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2021-05-02 12:12:14,584 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 63 [2021-05-02 12:12:14,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:14,584 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2021-05-02 12:12:14,584 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:14,584 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2021-05-02 12:12:14,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-02 12:12:14,585 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:14,585 INFO L523 BasicCegarLoop]: trace histogram [50, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:14,799 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:14,800 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:14,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:14,800 INFO L82 PathProgramCache]: Analyzing trace with hash -445755741, now seen corresponding path program 11 times [2021-05-02 12:12:14,800 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:14,800 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506135853] [2021-05-02 12:12:14,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:14,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:14,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:14,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:14,896 INFO L134 CoverageAnalysis]: Checked inductivity of 1510 backedges. 0 proven. 1235 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2021-05-02 12:12:14,896 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:14,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506135853] [2021-05-02 12:12:14,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506135853] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:14,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1606226815] [2021-05-02 12:12:14,896 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:15,893 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 26 check-sat command(s) [2021-05-02 12:12:15,893 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:15,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 12:12:15,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:15,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:15,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:15,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:15,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:15,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:15,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:15,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:16,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:16,059 INFO L134 CoverageAnalysis]: Checked inductivity of 1510 backedges. 0 proven. 1235 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2021-05-02 12:12:16,059 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1606226815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:16,059 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:16,059 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 12:12:16,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043647732] [2021-05-02 12:12:16,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 12:12:16,060 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:16,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 12:12:16,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 12:12:16,060 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:16,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:16,288 INFO L93 Difference]: Finished difference Result 107 states and 114 transitions. [2021-05-02 12:12:16,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 12:12:16,289 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 76 [2021-05-02 12:12:16,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:16,289 INFO L225 Difference]: With dead ends: 107 [2021-05-02 12:12:16,289 INFO L226 Difference]: Without dead ends: 102 [2021-05-02 12:12:16,290 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 73 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 205.0ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-02 12:12:16,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-02 12:12:16,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 90. [2021-05-02 12:12:16,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 85 states have (on average 1.0823529411764705) internal successors, (92), 85 states have internal predecessors, (92), 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 12:12:16,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 96 transitions. [2021-05-02 12:12:16,299 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 96 transitions. Word has length 76 [2021-05-02 12:12:16,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:16,299 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 96 transitions. [2021-05-02 12:12:16,299 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.0) internal successors, (30), 9 states have internal predecessors, (30), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:16,299 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 96 transitions. [2021-05-02 12:12:16,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 12:12:16,299 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:16,299 INFO L523 BasicCegarLoop]: trace histogram [60, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:16,503 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 12:12:16,503 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:16,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:16,504 INFO L82 PathProgramCache]: Analyzing trace with hash 1359606601, now seen corresponding path program 12 times [2021-05-02 12:12:16,504 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:16,504 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137256916] [2021-05-02 12:12:16,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:16,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:16,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:16,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:16,667 INFO L134 CoverageAnalysis]: Checked inductivity of 2181 backedges. 0 proven. 1851 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-05-02 12:12:16,668 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:16,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137256916] [2021-05-02 12:12:16,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [137256916] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:16,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1037732623] [2021-05-02 12:12:16,668 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:17,786 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 29 check-sat command(s) [2021-05-02 12:12:17,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:17,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 12:12:17,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:17,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:17,929 INFO L134 CoverageAnalysis]: Checked inductivity of 2181 backedges. 0 proven. 1851 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-05-02 12:12:17,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1037732623] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:17,929 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:17,929 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 12:12:17,929 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461325585] [2021-05-02 12:12:17,930 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 12:12:17,930 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:17,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 12:12:17,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 12:12:17,930 INFO L87 Difference]: Start difference. First operand 90 states and 96 transitions. Second operand has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:18,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:18,210 INFO L93 Difference]: Finished difference Result 120 states and 128 transitions. [2021-05-02 12:12:18,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 12:12:18,210 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 89 [2021-05-02 12:12:18,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:18,211 INFO L225 Difference]: With dead ends: 120 [2021-05-02 12:12:18,211 INFO L226 Difference]: Without dead ends: 115 [2021-05-02 12:12:18,211 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 90 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 212.3ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:12:18,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-02 12:12:18,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 103. [2021-05-02 12:12:18,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 98 states have (on average 1.0816326530612246) internal successors, (106), 98 states have internal predecessors, (106), 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 12:12:18,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 110 transitions. [2021-05-02 12:12:18,221 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 110 transitions. Word has length 89 [2021-05-02 12:12:18,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:18,221 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 110 transitions. [2021-05-02 12:12:18,221 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 3.090909090909091) internal successors, (34), 10 states have internal predecessors, (34), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:18,221 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 110 transitions. [2021-05-02 12:12:18,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-02 12:12:18,222 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:18,222 INFO L523 BasicCegarLoop]: trace histogram [70, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:18,422 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 12:12:18,423 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:18,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:18,423 INFO L82 PathProgramCache]: Analyzing trace with hash 1682541667, now seen corresponding path program 13 times [2021-05-02 12:12:18,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:18,423 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601548472] [2021-05-02 12:12:18,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:18,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:18,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:18,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:18,573 INFO L134 CoverageAnalysis]: Checked inductivity of 2975 backedges. 0 proven. 2590 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2021-05-02 12:12:18,573 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:18,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601548472] [2021-05-02 12:12:18,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [601548472] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:18,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795907951] [2021-05-02 12:12:18,573 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:18,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:18,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 12:12:18,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:18,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:18,802 INFO L134 CoverageAnalysis]: Checked inductivity of 2975 backedges. 0 proven. 2590 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2021-05-02 12:12:18,802 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795907951] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:18,802 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:18,802 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 12:12:18,802 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379347153] [2021-05-02 12:12:18,803 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 12:12:18,803 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:18,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 12:12:18,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 12:12:18,803 INFO L87 Difference]: Start difference. First operand 103 states and 110 transitions. Second operand has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:19,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:19,087 INFO L93 Difference]: Finished difference Result 133 states and 142 transitions. [2021-05-02 12:12:19,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 12:12:19,087 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 102 [2021-05-02 12:12:19,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:19,088 INFO L225 Difference]: With dead ends: 133 [2021-05-02 12:12:19,088 INFO L226 Difference]: Without dead ends: 128 [2021-05-02 12:12:19,088 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 242.5ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 12:12:19,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-05-02 12:12:19,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 116. [2021-05-02 12:12:19,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 111 states have (on average 1.0810810810810811) internal successors, (120), 111 states have internal predecessors, (120), 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 12:12:19,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 124 transitions. [2021-05-02 12:12:19,099 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 124 transitions. Word has length 102 [2021-05-02 12:12:19,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:19,100 INFO L480 AbstractCegarLoop]: Abstraction has 116 states and 124 transitions. [2021-05-02 12:12:19,100 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.1666666666666665) internal successors, (38), 11 states have internal predecessors, (38), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:19,100 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 124 transitions. [2021-05-02 12:12:19,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2021-05-02 12:12:19,100 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:19,100 INFO L523 BasicCegarLoop]: trace histogram [80, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:19,301 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 12:12:19,301 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:19,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:19,301 INFO L82 PathProgramCache]: Analyzing trace with hash 1299254665, now seen corresponding path program 14 times [2021-05-02 12:12:19,301 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:19,301 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [896154282] [2021-05-02 12:12:19,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:19,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:19,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:19,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:19,436 INFO L134 CoverageAnalysis]: Checked inductivity of 3892 backedges. 0 proven. 3452 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2021-05-02 12:12:19,436 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:19,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [896154282] [2021-05-02 12:12:19,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [896154282] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:19,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2028351605] [2021-05-02 12:12:19,436 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:19,510 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:12:19,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:19,511 INFO L263 TraceCheckSpWp]: Trace formula consists of 375 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 12:12:19,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:19,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:19,688 INFO L134 CoverageAnalysis]: Checked inductivity of 3892 backedges. 0 proven. 3452 refuted. 0 times theorem prover too weak. 440 trivial. 0 not checked. [2021-05-02 12:12:19,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2028351605] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:19,689 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:19,689 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 12:12:19,689 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519408064] [2021-05-02 12:12:19,689 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 12:12:19,689 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:19,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 12:12:19,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 12:12:19,689 INFO L87 Difference]: Start difference. First operand 116 states and 124 transitions. Second operand has 13 states, 13 states have (on average 3.230769230769231) internal successors, (42), 12 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:20,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:20,082 INFO L93 Difference]: Finished difference Result 146 states and 156 transitions. [2021-05-02 12:12:20,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 12:12:20,082 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.230769230769231) internal successors, (42), 12 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 115 [2021-05-02 12:12:20,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:20,083 INFO L225 Difference]: With dead ends: 146 [2021-05-02 12:12:20,083 INFO L226 Difference]: Without dead ends: 141 [2021-05-02 12:12:20,084 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 116 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 264.6ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 12:12:20,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2021-05-02 12:12:20,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 129. [2021-05-02 12:12:20,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 124 states have (on average 1.0806451612903225) internal successors, (134), 124 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 12:12:20,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 138 transitions. [2021-05-02 12:12:20,104 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 138 transitions. Word has length 115 [2021-05-02 12:12:20,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:20,104 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 138 transitions. [2021-05-02 12:12:20,105 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.230769230769231) internal successors, (42), 12 states have internal predecessors, (42), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:20,105 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 138 transitions. [2021-05-02 12:12:20,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-02 12:12:20,105 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:20,106 INFO L523 BasicCegarLoop]: trace histogram [90, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:20,308 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:20,309 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:20,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:20,309 INFO L82 PathProgramCache]: Analyzing trace with hash 86972963, now seen corresponding path program 15 times [2021-05-02 12:12:20,309 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:20,309 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170777764] [2021-05-02 12:12:20,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:20,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:20,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:20,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:20,516 INFO L134 CoverageAnalysis]: Checked inductivity of 4932 backedges. 0 proven. 4437 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2021-05-02 12:12:20,516 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:20,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170777764] [2021-05-02 12:12:20,516 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170777764] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:20,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526672585] [2021-05-02 12:12:20,516 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:21,949 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2021-05-02 12:12:21,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:21,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 120 conjunts are in the unsatisfiable core [2021-05-02 12:12:21,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:22,094 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:22,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:22,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:22,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:22,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:22,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:22,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:22,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:22,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:22,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:23,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:23,167 INFO L134 CoverageAnalysis]: Checked inductivity of 4932 backedges. 45 proven. 4590 refuted. 0 times theorem prover too weak. 297 trivial. 0 not checked. [2021-05-02 12:12:23,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526672585] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:23,168 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:23,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 44] total 46 [2021-05-02 12:12:23,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767123712] [2021-05-02 12:12:23,169 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 12:12:23,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:23,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 12:12:23,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1885, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:12:23,170 INFO L87 Difference]: Start difference. First operand 129 states and 138 transitions. Second operand has 46 states, 46 states have (on average 1.8043478260869565) internal successors, (83), 45 states have internal predecessors, (83), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:25,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:25,241 INFO L93 Difference]: Finished difference Result 175 states and 189 transitions. [2021-05-02 12:12:25,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 12:12:25,241 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.8043478260869565) internal successors, (83), 45 states have internal predecessors, (83), 2 states have call successors, (4), 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 128 [2021-05-02 12:12:25,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:25,242 INFO L225 Difference]: With dead ends: 175 [2021-05-02 12:12:25,242 INFO L226 Difference]: Without dead ends: 154 [2021-05-02 12:12:25,244 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2234 ImplicationChecksByTransitivity, 2140.1ms TimeCoverageRelationStatistics Valid=476, Invalid=6834, Unknown=0, NotChecked=0, Total=7310 [2021-05-02 12:12:25,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2021-05-02 12:12:25,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 142. [2021-05-02 12:12:25,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 137 states have (on average 1.072992700729927) internal successors, (147), 137 states have internal predecessors, (147), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:25,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 151 transitions. [2021-05-02 12:12:25,268 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 151 transitions. Word has length 128 [2021-05-02 12:12:25,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:25,268 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 151 transitions. [2021-05-02 12:12:25,268 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 1.8043478260869565) internal successors, (83), 45 states have internal predecessors, (83), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:25,268 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 151 transitions. [2021-05-02 12:12:25,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-02 12:12:25,269 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:25,269 INFO L523 BasicCegarLoop]: trace histogram [100, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:25,473 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 12:12:25,473 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:25,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:25,473 INFO L82 PathProgramCache]: Analyzing trace with hash -1760569399, now seen corresponding path program 16 times [2021-05-02 12:12:25,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:25,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688393280] [2021-05-02 12:12:25,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:25,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:25,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:25,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:25,735 INFO L134 CoverageAnalysis]: Checked inductivity of 6095 backedges. 0 proven. 5545 refuted. 0 times theorem prover too weak. 550 trivial. 0 not checked. [2021-05-02 12:12:25,735 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:25,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688393280] [2021-05-02 12:12:25,735 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1688393280] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:25,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [792095839] [2021-05-02 12:12:25,735 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:25,852 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:12:25,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:25,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 12:12:25,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:26,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:26,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:26,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:26,080 INFO L134 CoverageAnalysis]: Checked inductivity of 6095 backedges. 0 proven. 5545 refuted. 0 times theorem prover too weak. 550 trivial. 0 not checked. [2021-05-02 12:12:26,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [792095839] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:26,080 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:26,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15] total 17 [2021-05-02 12:12:26,080 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145596825] [2021-05-02 12:12:26,080 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 12:12:26,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:26,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 12:12:26,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2021-05-02 12:12:26,081 INFO L87 Difference]: Start difference. First operand 142 states and 151 transitions. Second operand has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 15 states have internal predecessors, (52), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:26,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:26,630 INFO L93 Difference]: Finished difference Result 172 states and 183 transitions. [2021-05-02 12:12:26,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 12:12:26,631 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 15 states have internal predecessors, (52), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 141 [2021-05-02 12:12:26,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:26,631 INFO L225 Difference]: With dead ends: 172 [2021-05-02 12:12:26,631 INFO L226 Difference]: Without dead ends: 167 [2021-05-02 12:12:26,632 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 140 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 400.7ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-02 12:12:26,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-02 12:12:26,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 155. [2021-05-02 12:12:26,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 150 states have (on average 1.0733333333333333) internal successors, (161), 150 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 12:12:26,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 165 transitions. [2021-05-02 12:12:26,651 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 165 transitions. Word has length 141 [2021-05-02 12:12:26,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:26,651 INFO L480 AbstractCegarLoop]: Abstraction has 155 states and 165 transitions. [2021-05-02 12:12:26,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 3.0588235294117645) internal successors, (52), 15 states have internal predecessors, (52), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:26,651 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 165 transitions. [2021-05-02 12:12:26,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-05-02 12:12:26,652 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:26,652 INFO L523 BasicCegarLoop]: trace histogram [110, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:26,864 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:26,865 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:26,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:26,865 INFO L82 PathProgramCache]: Analyzing trace with hash 1155200995, now seen corresponding path program 17 times [2021-05-02 12:12:26,865 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:26,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473019263] [2021-05-02 12:12:26,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:26,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:27,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:27,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:27,047 INFO L134 CoverageAnalysis]: Checked inductivity of 7381 backedges. 0 proven. 6776 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2021-05-02 12:12:27,047 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:27,047 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [473019263] [2021-05-02 12:12:27,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [473019263] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:27,047 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742471868] [2021-05-02 12:12:27,047 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:33,869 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 52 check-sat command(s) [2021-05-02 12:12:33,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:33,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 227 conjunts are in the unsatisfiable core [2021-05-02 12:12:33,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:33,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:33,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:33,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:33,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:33,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:33,951 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:33,953 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:33,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:34,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:34,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:34,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:34,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:34,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:34,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:34,694 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:36,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:36,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:36,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:36,695 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:36,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:36,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:36,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:36,798 INFO L134 CoverageAnalysis]: Checked inductivity of 7381 backedges. 114 proven. 7049 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2021-05-02 12:12:36,799 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [742471868] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:36,799 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:36,799 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 79] total 81 [2021-05-02 12:12:36,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862905219] [2021-05-02 12:12:36,799 INFO L460 AbstractCegarLoop]: Interpolant automaton has 81 states [2021-05-02 12:12:36,799 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:36,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2021-05-02 12:12:36,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=350, Invalid=6130, Unknown=0, NotChecked=0, Total=6480 [2021-05-02 12:12:36,801 INFO L87 Difference]: Start difference. First operand 155 states and 165 transitions. Second operand has 81 states, 81 states have (on average 1.5802469135802468) internal successors, (128), 80 states have internal predecessors, (128), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:41,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:41,269 INFO L93 Difference]: Finished difference Result 266 states and 285 transitions. [2021-05-02 12:12:41,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-05-02 12:12:41,270 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 1.5802469135802468) internal successors, (128), 80 states have internal predecessors, (128), 2 states have call successors, (4), 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 154 [2021-05-02 12:12:41,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:41,271 INFO L225 Difference]: With dead ends: 266 [2021-05-02 12:12:41,271 INFO L226 Difference]: Without dead ends: 180 [2021-05-02 12:12:41,274 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 85 SyntacticMatches, 6 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9156 ImplicationChecksByTransitivity, 4752.5ms TimeCoverageRelationStatistics Valid=931, Invalid=23249, Unknown=0, NotChecked=0, Total=24180 [2021-05-02 12:12:41,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2021-05-02 12:12:41,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 168. [2021-05-02 12:12:41,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 168 states, 163 states have (on average 1.0552147239263803) internal successors, (172), 163 states have internal predecessors, (172), 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 12:12:41,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 176 transitions. [2021-05-02 12:12:41,295 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 176 transitions. Word has length 154 [2021-05-02 12:12:41,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:41,295 INFO L480 AbstractCegarLoop]: Abstraction has 168 states and 176 transitions. [2021-05-02 12:12:41,295 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 81 states, 81 states have (on average 1.5802469135802468) internal successors, (128), 80 states have internal predecessors, (128), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:41,295 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 176 transitions. [2021-05-02 12:12:41,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2021-05-02 12:12:41,296 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:41,296 INFO L523 BasicCegarLoop]: trace histogram [120, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:41,501 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 12:12:41,502 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:41,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:41,502 INFO L82 PathProgramCache]: Analyzing trace with hash 1118458377, now seen corresponding path program 18 times [2021-05-02 12:12:41,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:41,502 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623369036] [2021-05-02 12:12:41,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:41,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:41,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:41,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:41,731 INFO L134 CoverageAnalysis]: Checked inductivity of 8790 backedges. 0 proven. 8130 refuted. 0 times theorem prover too weak. 660 trivial. 0 not checked. [2021-05-02 12:12:41,731 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:41,732 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623369036] [2021-05-02 12:12:41,732 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623369036] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:41,732 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634139922] [2021-05-02 12:12:41,732 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:45,779 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 55 check-sat command(s) [2021-05-02 12:12:45,779 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:45,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 483 conjuncts, 215 conjunts are in the unsatisfiable core [2021-05-02 12:12:45,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:46,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:46,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:47,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:47,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:47,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:47,633 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:47,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:47,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:47,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:47,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:47,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:47,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:47,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:48,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:48,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:48,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:48,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:48,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:48,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:48,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:48,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:48,276 INFO L134 CoverageAnalysis]: Checked inductivity of 8790 backedges. 100 proven. 8404 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2021-05-02 12:12:48,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634139922] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:48,277 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:48,277 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 76] total 78 [2021-05-02 12:12:48,277 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [633898015] [2021-05-02 12:12:48,277 INFO L460 AbstractCegarLoop]: Interpolant automaton has 78 states [2021-05-02 12:12:48,277 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:48,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2021-05-02 12:12:48,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=322, Invalid=5684, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 12:12:48,279 INFO L87 Difference]: Start difference. First operand 168 states and 176 transitions. Second operand has 78 states, 78 states have (on average 1.6282051282051282) internal successors, (127), 77 states have internal predecessors, (127), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:52,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:52,610 INFO L93 Difference]: Finished difference Result 198 states and 208 transitions. [2021-05-02 12:12:52,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 77 states. [2021-05-02 12:12:52,611 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 1.6282051282051282) internal successors, (127), 77 states have internal predecessors, (127), 2 states have call successors, (4), 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 12:12:52,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:52,612 INFO L225 Difference]: With dead ends: 198 [2021-05-02 12:12:52,612 INFO L226 Difference]: Without dead ends: 193 [2021-05-02 12:12:52,614 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 103 SyntacticMatches, 5 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8563 ImplicationChecksByTransitivity, 4357.0ms TimeCoverageRelationStatistics Valid=882, Invalid=22070, Unknown=0, NotChecked=0, Total=22952 [2021-05-02 12:12:52,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-05-02 12:12:52,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 181. [2021-05-02 12:12:52,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 176 states have (on average 1.0568181818181819) internal successors, (186), 176 states have internal predecessors, (186), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:52,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 190 transitions. [2021-05-02 12:12:52,637 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 190 transitions. Word has length 167 [2021-05-02 12:12:52,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:52,637 INFO L480 AbstractCegarLoop]: Abstraction has 181 states and 190 transitions. [2021-05-02 12:12:52,637 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 78 states, 78 states have (on average 1.6282051282051282) internal successors, (127), 77 states have internal predecessors, (127), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:52,638 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 190 transitions. [2021-05-02 12:12:52,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-05-02 12:12:52,638 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:52,638 INFO L523 BasicCegarLoop]: trace histogram [130, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:52,839 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 12:12:52,839 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:52,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:52,839 INFO L82 PathProgramCache]: Analyzing trace with hash -318167645, now seen corresponding path program 19 times [2021-05-02 12:12:52,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:52,839 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132939414] [2021-05-02 12:12:52,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:52,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:53,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:53,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:53,075 INFO L134 CoverageAnalysis]: Checked inductivity of 10322 backedges. 0 proven. 9607 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2021-05-02 12:12:53,075 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:53,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132939414] [2021-05-02 12:12:53,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2132939414] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:53,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208895297] [2021-05-02 12:12:53,076 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:53,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:53,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 555 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 12:12:53,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:53,436 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:53,442 INFO L134 CoverageAnalysis]: Checked inductivity of 10322 backedges. 0 proven. 9607 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2021-05-02 12:12:53,442 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [208895297] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:53,442 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:53,442 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 12:12:53,442 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322058581] [2021-05-02 12:12:53,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 12:12:53,443 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:53,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 12:12:53,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 12:12:53,443 INFO L87 Difference]: Start difference. First operand 181 states and 190 transitions. Second operand has 18 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 17 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:54,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:54,099 INFO L93 Difference]: Finished difference Result 211 states and 222 transitions. [2021-05-02 12:12:54,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 12:12:54,100 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 17 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 180 [2021-05-02 12:12:54,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:54,104 INFO L225 Difference]: With dead ends: 211 [2021-05-02 12:12:54,104 INFO L226 Difference]: Without dead ends: 206 [2021-05-02 12:12:54,104 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 181 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 468.1ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 12:12:54,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-05-02 12:12:54,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 194. [2021-05-02 12:12:54,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 194 states, 189 states have (on average 1.0582010582010581) internal successors, (200), 189 states have internal predecessors, (200), 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 12:12:54,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 204 transitions. [2021-05-02 12:12:54,130 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 204 transitions. Word has length 180 [2021-05-02 12:12:54,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:54,130 INFO L480 AbstractCegarLoop]: Abstraction has 194 states and 204 transitions. [2021-05-02 12:12:54,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.4444444444444446) internal successors, (62), 17 states have internal predecessors, (62), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:54,130 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 204 transitions. [2021-05-02 12:12:54,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2021-05-02 12:12:54,131 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:54,131 INFO L523 BasicCegarLoop]: trace histogram [140, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:54,331 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 12:12:54,331 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:54,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:54,332 INFO L82 PathProgramCache]: Analyzing trace with hash 939818057, now seen corresponding path program 20 times [2021-05-02 12:12:54,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:54,332 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487737786] [2021-05-02 12:12:54,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:54,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:54,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:54,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:54,611 INFO L134 CoverageAnalysis]: Checked inductivity of 11977 backedges. 0 proven. 11207 refuted. 0 times theorem prover too weak. 770 trivial. 0 not checked. [2021-05-02 12:12:54,612 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:54,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487737786] [2021-05-02 12:12:54,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [487737786] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:54,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933563945] [2021-05-02 12:12:54,612 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:54,720 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:12:54,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:54,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 591 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 12:12:54,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:12:54,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:12:54,997 INFO L134 CoverageAnalysis]: Checked inductivity of 11977 backedges. 0 proven. 11207 refuted. 0 times theorem prover too weak. 770 trivial. 0 not checked. [2021-05-02 12:12:54,997 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [933563945] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:54,997 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:12:54,997 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 12:12:54,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194746722] [2021-05-02 12:12:54,997 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 12:12:54,998 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:12:54,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 12:12:54,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 12:12:54,998 INFO L87 Difference]: Start difference. First operand 194 states and 204 transitions. Second operand has 19 states, 19 states have (on average 3.473684210526316) internal successors, (66), 18 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:55,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:12:55,805 INFO L93 Difference]: Finished difference Result 224 states and 236 transitions. [2021-05-02 12:12:55,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 12:12:55,805 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.473684210526316) internal successors, (66), 18 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 193 [2021-05-02 12:12:55,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:12:55,806 INFO L225 Difference]: With dead ends: 224 [2021-05-02 12:12:55,806 INFO L226 Difference]: Without dead ends: 219 [2021-05-02 12:12:55,806 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 194 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 563.2ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 12:12:55,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-05-02 12:12:55,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 207. [2021-05-02 12:12:55,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 202 states have (on average 1.0594059405940595) internal successors, (214), 202 states have internal predecessors, (214), 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 12:12:55,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 218 transitions. [2021-05-02 12:12:55,835 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 218 transitions. Word has length 193 [2021-05-02 12:12:55,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:12:55,835 INFO L480 AbstractCegarLoop]: Abstraction has 207 states and 218 transitions. [2021-05-02 12:12:55,836 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.473684210526316) internal successors, (66), 18 states have internal predecessors, (66), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:12:55,836 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 218 transitions. [2021-05-02 12:12:55,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-05-02 12:12:55,844 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:12:55,844 INFO L523 BasicCegarLoop]: trace histogram [150, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:12:56,051 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 12:12:56,051 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:12:56,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:12:56,051 INFO L82 PathProgramCache]: Analyzing trace with hash -730487965, now seen corresponding path program 21 times [2021-05-02 12:12:56,052 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:12:56,052 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [991946960] [2021-05-02 12:12:56,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:12:56,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:56,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:12:56,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:12:56,320 INFO L134 CoverageAnalysis]: Checked inductivity of 13755 backedges. 0 proven. 12930 refuted. 0 times theorem prover too weak. 825 trivial. 0 not checked. [2021-05-02 12:12:56,321 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:12:56,321 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [991946960] [2021-05-02 12:12:56,321 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [991946960] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:12:56,321 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1125939073] [2021-05-02 12:12:56,321 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:12:59,520 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2021-05-02 12:12:59,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:12:59,529 WARN L261 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 322 conjunts are in the unsatisfiable core [2021-05-02 12:12:59,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:13:00,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:00,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:00,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:00,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:00,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:00,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:00,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:00,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:00,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:00,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:00,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,566 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,571 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:01,786 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,413 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,414 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:03,878 INFO L134 CoverageAnalysis]: Checked inductivity of 13755 backedges. 71 proven. 13403 refuted. 0 times theorem prover too weak. 281 trivial. 0 not checked. [2021-05-02 12:13:03,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1125939073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:13:03,878 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:13:03,878 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 112] total 114 [2021-05-02 12:13:03,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943338556] [2021-05-02 12:13:03,879 INFO L460 AbstractCegarLoop]: Interpolant automaton has 114 states [2021-05-02 12:13:03,879 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:13:03,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 114 interpolants. [2021-05-02 12:13:03,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=12435, Unknown=0, NotChecked=0, Total=12882 [2021-05-02 12:13:03,880 INFO L87 Difference]: Start difference. First operand 207 states and 218 transitions. Second operand has 114 states, 114 states have (on average 1.543859649122807) internal successors, (176), 113 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 12:13:09,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:13:09,911 INFO L93 Difference]: Finished difference Result 422 states and 447 transitions. [2021-05-02 12:13:09,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 109 states. [2021-05-02 12:13:09,912 INFO L78 Accepts]: Start accepts. Automaton has has 114 states, 114 states have (on average 1.543859649122807) internal successors, (176), 113 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 206 [2021-05-02 12:13:09,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:13:09,912 INFO L225 Difference]: With dead ends: 422 [2021-05-02 12:13:09,913 INFO L226 Difference]: Without dead ends: 232 [2021-05-02 12:13:09,915 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 218 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19001 ImplicationChecksByTransitivity, 7303.9ms TimeCoverageRelationStatistics Valid=1161, Invalid=47019, Unknown=0, NotChecked=0, Total=48180 [2021-05-02 12:13:09,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-05-02 12:13:09,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 220. [2021-05-02 12:13:09,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 215 states have (on average 1.0372093023255815) internal successors, (223), 215 states have internal predecessors, (223), 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 12:13:09,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 227 transitions. [2021-05-02 12:13:09,947 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 227 transitions. Word has length 206 [2021-05-02 12:13:09,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:13:09,947 INFO L480 AbstractCegarLoop]: Abstraction has 220 states and 227 transitions. [2021-05-02 12:13:09,948 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 114 states, 114 states have (on average 1.543859649122807) internal successors, (176), 113 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 12:13:09,948 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 227 transitions. [2021-05-02 12:13:09,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 220 [2021-05-02 12:13:09,948 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:13:09,948 INFO L523 BasicCegarLoop]: trace histogram [160, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:13:10,156 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 12:13:10,156 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:13:10,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:13:10,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1910658697, now seen corresponding path program 22 times [2021-05-02 12:13:10,156 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:13:10,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707269766] [2021-05-02 12:13:10,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:13:10,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:13:10,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:13:10,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:13:10,458 INFO L134 CoverageAnalysis]: Checked inductivity of 15656 backedges. 0 proven. 14776 refuted. 0 times theorem prover too weak. 880 trivial. 0 not checked. [2021-05-02 12:13:10,458 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:13:10,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707269766] [2021-05-02 12:13:10,458 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [707269766] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:13:10,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1887453881] [2021-05-02 12:13:10,458 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:13:10,513 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:13:10,513 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:13:10,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 12:13:10,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:13:10,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:10,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:10,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:10,845 INFO L134 CoverageAnalysis]: Checked inductivity of 15656 backedges. 0 proven. 14776 refuted. 0 times theorem prover too weak. 880 trivial. 0 not checked. [2021-05-02 12:13:10,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1887453881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:13:10,845 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:13:10,845 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21] total 23 [2021-05-02 12:13:10,845 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697095875] [2021-05-02 12:13:10,845 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:13:10,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:13:10,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:13:10,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=446, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:13:10,846 INFO L87 Difference]: Start difference. First operand 220 states and 227 transitions. Second operand has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 21 states have internal predecessors, (76), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:13:11,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:13:11,856 INFO L93 Difference]: Finished difference Result 250 states and 259 transitions. [2021-05-02 12:13:11,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 12:13:11,856 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 21 states have internal predecessors, (76), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 219 [2021-05-02 12:13:11,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:13:11,857 INFO L225 Difference]: With dead ends: 250 [2021-05-02 12:13:11,857 INFO L226 Difference]: Without dead ends: 245 [2021-05-02 12:13:11,858 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 218 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 657.9ms TimeCoverageRelationStatistics Valid=145, Invalid=1415, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 12:13:11,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-05-02 12:13:11,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 233. [2021-05-02 12:13:11,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 228 states have (on average 1.0394736842105263) internal successors, (237), 228 states have internal predecessors, (237), 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 12:13:11,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 241 transitions. [2021-05-02 12:13:11,893 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 241 transitions. Word has length 219 [2021-05-02 12:13:11,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:13:11,893 INFO L480 AbstractCegarLoop]: Abstraction has 233 states and 241 transitions. [2021-05-02 12:13:11,893 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 21 states have internal predecessors, (76), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:13:11,893 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 241 transitions. [2021-05-02 12:13:11,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2021-05-02 12:13:11,894 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:13:11,894 INFO L523 BasicCegarLoop]: trace histogram [170, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:13:12,101 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:13:12,102 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:13:12,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:13:12,102 INFO L82 PathProgramCache]: Analyzing trace with hash -1629720285, now seen corresponding path program 23 times [2021-05-02 12:13:12,102 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:13:12,102 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613918704] [2021-05-02 12:13:12,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:13:12,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:13:12,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:13:12,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:13:12,474 INFO L134 CoverageAnalysis]: Checked inductivity of 17680 backedges. 0 proven. 16745 refuted. 0 times theorem prover too weak. 935 trivial. 0 not checked. [2021-05-02 12:13:12,474 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:13:12,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613918704] [2021-05-02 12:13:12,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613918704] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:13:12,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1564877425] [2021-05-02 12:13:12,474 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:13:19,421 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 78 check-sat command(s) [2021-05-02 12:13:19,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:13:19,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 699 conjuncts, 324 conjunts are in the unsatisfiable core [2021-05-02 12:13:19,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:13:19,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:19,485 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:19,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:19,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:19,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:20,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:20,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:20,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:20,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:20,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:20,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:20,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:20,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:23,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:23,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:23,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:23,616 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:24,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:24,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:24,411 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:24,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:24,513 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:24,519 INFO L134 CoverageAnalysis]: Checked inductivity of 17680 backedges. 113 proven. 17133 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2021-05-02 12:13:24,519 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1564877425] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:13:24,519 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:13:24,519 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 110] total 112 [2021-05-02 12:13:24,519 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353582642] [2021-05-02 12:13:24,519 INFO L460 AbstractCegarLoop]: Interpolant automaton has 112 states [2021-05-02 12:13:24,520 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:13:24,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 112 interpolants. [2021-05-02 12:13:24,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=478, Invalid=11954, Unknown=0, NotChecked=0, Total=12432 [2021-05-02 12:13:24,521 INFO L87 Difference]: Start difference. First operand 233 states and 241 transitions. Second operand has 112 states, 112 states have (on average 1.5982142857142858) internal successors, (179), 111 states have internal predecessors, (179), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:13:30,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:13:30,812 INFO L93 Difference]: Finished difference Result 435 states and 453 transitions. [2021-05-02 12:13:30,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-05-02 12:13:30,813 INFO L78 Accepts]: Start accepts. Automaton has has 112 states, 112 states have (on average 1.5982142857142858) internal successors, (179), 111 states have internal predecessors, (179), 2 states have call successors, (4), 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 232 [2021-05-02 12:13:30,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:13:30,814 INFO L225 Difference]: With dead ends: 435 [2021-05-02 12:13:30,814 INFO L226 Difference]: Without dead ends: 258 [2021-05-02 12:13:30,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 135 SyntacticMatches, 9 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18299 ImplicationChecksByTransitivity, 8365.1ms TimeCoverageRelationStatistics Valid=1270, Invalid=45602, Unknown=0, NotChecked=0, Total=46872 [2021-05-02 12:13:30,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2021-05-02 12:13:30,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 246. [2021-05-02 12:13:30,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 241 states have (on average 1.033195020746888) internal successors, (249), 241 states have internal predecessors, (249), 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 12:13:30,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 253 transitions. [2021-05-02 12:13:30,860 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 253 transitions. Word has length 232 [2021-05-02 12:13:30,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:13:30,861 INFO L480 AbstractCegarLoop]: Abstraction has 246 states and 253 transitions. [2021-05-02 12:13:30,861 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 112 states, 112 states have (on average 1.5982142857142858) internal successors, (179), 111 states have internal predecessors, (179), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:13:30,861 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 253 transitions. [2021-05-02 12:13:30,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2021-05-02 12:13:30,862 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:13:30,862 INFO L523 BasicCegarLoop]: trace histogram [180, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:13:31,067 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 12:13:31,068 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:13:31,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:13:31,068 INFO L82 PathProgramCache]: Analyzing trace with hash 1040703689, now seen corresponding path program 24 times [2021-05-02 12:13:31,068 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:13:31,068 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92622018] [2021-05-02 12:13:31,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:13:31,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:13:31,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:13:31,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:13:31,454 INFO L134 CoverageAnalysis]: Checked inductivity of 19827 backedges. 0 proven. 18837 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2021-05-02 12:13:31,454 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:13:31,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92622018] [2021-05-02 12:13:31,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92622018] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:13:31,455 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146226233] [2021-05-02 12:13:31,455 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:13:45,941 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 81 check-sat command(s) [2021-05-02 12:13:45,941 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:13:45,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 699 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 12:13:45,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:13:46,350 INFO L134 CoverageAnalysis]: Checked inductivity of 19827 backedges. 0 proven. 18837 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2021-05-02 12:13:46,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1146226233] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:13:46,351 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:13:46,351 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 12:13:46,351 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015750666] [2021-05-02 12:13:46,351 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 12:13:46,351 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:13:46,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 12:13:46,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 12:13:46,352 INFO L87 Difference]: Start difference. First operand 246 states and 253 transitions. Second operand has 23 states, 23 states have (on average 3.5652173913043477) internal successors, (82), 22 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:13:47,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:13:47,508 INFO L93 Difference]: Finished difference Result 276 states and 285 transitions. [2021-05-02 12:13:47,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 12:13:47,508 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.5652173913043477) internal successors, (82), 22 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 245 [2021-05-02 12:13:47,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:13:47,510 INFO L225 Difference]: With dead ends: 276 [2021-05-02 12:13:47,510 INFO L226 Difference]: Without dead ends: 271 [2021-05-02 12:13:47,510 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 243 SyntacticMatches, 4 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 760.8ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 12:13:47,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-05-02 12:13:47,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 259. [2021-05-02 12:13:47,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 254 states have (on average 1.0354330708661417) internal successors, (263), 254 states have internal predecessors, (263), 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 12:13:47,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 267 transitions. [2021-05-02 12:13:47,573 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 267 transitions. Word has length 245 [2021-05-02 12:13:47,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:13:47,573 INFO L480 AbstractCegarLoop]: Abstraction has 259 states and 267 transitions. [2021-05-02 12:13:47,573 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 3.5652173913043477) internal successors, (82), 22 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:13:47,573 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 267 transitions. [2021-05-02 12:13:47,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2021-05-02 12:13:47,574 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:13:47,574 INFO L523 BasicCegarLoop]: trace histogram [190, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:13:47,779 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 12:13:47,779 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:13:47,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:13:47,780 INFO L82 PathProgramCache]: Analyzing trace with hash 2096729827, now seen corresponding path program 25 times [2021-05-02 12:13:47,780 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:13:47,780 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [782401528] [2021-05-02 12:13:47,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:13:47,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:13:48,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:13:48,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:13:48,162 INFO L134 CoverageAnalysis]: Checked inductivity of 22097 backedges. 0 proven. 21052 refuted. 0 times theorem prover too weak. 1045 trivial. 0 not checked. [2021-05-02 12:13:48,162 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:13:48,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [782401528] [2021-05-02 12:13:48,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [782401528] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:13:48,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581000261] [2021-05-02 12:13:48,162 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:13:48,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:13:48,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 771 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 12:13:48,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:13:48,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:48,679 INFO L134 CoverageAnalysis]: Checked inductivity of 22097 backedges. 0 proven. 21052 refuted. 0 times theorem prover too weak. 1045 trivial. 0 not checked. [2021-05-02 12:13:48,679 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581000261] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:13:48,679 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:13:48,680 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 12:13:48,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579119807] [2021-05-02 12:13:48,680 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 12:13:48,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:13:48,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 12:13:48,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 12:13:48,680 INFO L87 Difference]: Start difference. First operand 259 states and 267 transitions. Second operand has 24 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 23 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:13:49,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:13:49,890 INFO L93 Difference]: Finished difference Result 289 states and 299 transitions. [2021-05-02 12:13:49,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 12:13:49,891 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 23 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 258 [2021-05-02 12:13:49,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:13:49,892 INFO L225 Difference]: With dead ends: 289 [2021-05-02 12:13:49,892 INFO L226 Difference]: Without dead ends: 284 [2021-05-02 12:13:49,892 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 259 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 194 ImplicationChecksByTransitivity, 754.4ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 12:13:49,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2021-05-02 12:13:49,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 272. [2021-05-02 12:13:49,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 267 states have (on average 1.0374531835205993) internal successors, (277), 267 states have internal predecessors, (277), 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 12:13:49,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 281 transitions. [2021-05-02 12:13:49,935 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 281 transitions. Word has length 258 [2021-05-02 12:13:49,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:13:49,936 INFO L480 AbstractCegarLoop]: Abstraction has 272 states and 281 transitions. [2021-05-02 12:13:49,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.5833333333333335) internal successors, (86), 23 states have internal predecessors, (86), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:13:49,936 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 281 transitions. [2021-05-02 12:13:49,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2021-05-02 12:13:49,937 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:13:49,937 INFO L523 BasicCegarLoop]: trace histogram [200, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:13:50,148 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:13:50,148 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:13:50,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:13:50,148 INFO L82 PathProgramCache]: Analyzing trace with hash 2100894473, now seen corresponding path program 26 times [2021-05-02 12:13:50,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:13:50,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349918543] [2021-05-02 12:13:50,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:13:50,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:13:50,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:13:50,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:13:50,554 INFO L134 CoverageAnalysis]: Checked inductivity of 24490 backedges. 0 proven. 23390 refuted. 0 times theorem prover too weak. 1100 trivial. 0 not checked. [2021-05-02 12:13:50,554 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:13:50,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349918543] [2021-05-02 12:13:50,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349918543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:13:50,554 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243207520] [2021-05-02 12:13:50,554 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:13:50,682 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:13:50,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:13:50,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 807 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 12:13:50,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:13:51,072 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:13:51,079 INFO L134 CoverageAnalysis]: Checked inductivity of 24490 backedges. 0 proven. 23390 refuted. 0 times theorem prover too weak. 1100 trivial. 0 not checked. [2021-05-02 12:13:51,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [243207520] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:13:51,079 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:13:51,079 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 12:13:51,079 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414942097] [2021-05-02 12:13:51,079 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 12:13:51,079 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:13:51,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 12:13:51,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 12:13:51,080 INFO L87 Difference]: Start difference. First operand 272 states and 281 transitions. Second operand has 25 states, 25 states have (on average 3.6) internal successors, (90), 24 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:13:52,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:13:52,440 INFO L93 Difference]: Finished difference Result 302 states and 313 transitions. [2021-05-02 12:13:52,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 12:13:52,441 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.6) internal successors, (90), 24 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 271 [2021-05-02 12:13:52,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:13:52,442 INFO L225 Difference]: With dead ends: 302 [2021-05-02 12:13:52,442 INFO L226 Difference]: Without dead ends: 297 [2021-05-02 12:13:52,442 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 272 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 214 ImplicationChecksByTransitivity, 858.0ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 12:13:52,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2021-05-02 12:13:52,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 285. [2021-05-02 12:13:52,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 285 states, 280 states have (on average 1.0392857142857144) internal successors, (291), 280 states have internal predecessors, (291), 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 12:13:52,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 295 transitions. [2021-05-02 12:13:52,497 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 295 transitions. Word has length 271 [2021-05-02 12:13:52,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:13:52,497 INFO L480 AbstractCegarLoop]: Abstraction has 285 states and 295 transitions. [2021-05-02 12:13:52,497 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 3.6) internal successors, (90), 24 states have internal predecessors, (90), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:13:52,498 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 295 transitions. [2021-05-02 12:13:52,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2021-05-02 12:13:52,498 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:13:52,499 INFO L523 BasicCegarLoop]: trace histogram [210, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:13:52,704 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:13:52,705 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:13:52,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:13:52,705 INFO L82 PathProgramCache]: Analyzing trace with hash -326566749, now seen corresponding path program 27 times [2021-05-02 12:13:52,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:13:52,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [493918643] [2021-05-02 12:13:52,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:13:52,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:13:53,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:13:53,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:13:53,123 INFO L134 CoverageAnalysis]: Checked inductivity of 27006 backedges. 0 proven. 25851 refuted. 0 times theorem prover too weak. 1155 trivial. 0 not checked. [2021-05-02 12:13:53,123 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:13:53,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [493918643] [2021-05-02 12:13:53,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [493918643] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:13:53,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1615375214] [2021-05-02 12:13:53,123 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:14:00,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 92 check-sat command(s) [2021-05-02 12:14:00,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:14:00,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 813 conjuncts, 277 conjunts are in the unsatisfiable core [2021-05-02 12:14:00,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:14:01,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,402 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:01,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,382 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,960 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:02,986 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,651 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,654 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:03,948 INFO L134 CoverageAnalysis]: Checked inductivity of 27006 backedges. 114 proven. 26161 refuted. 0 times theorem prover too weak. 731 trivial. 0 not checked. [2021-05-02 12:14:03,949 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1615375214] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:14:03,949 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:14:03,949 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 93] total 95 [2021-05-02 12:14:03,949 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617997370] [2021-05-02 12:14:03,949 INFO L460 AbstractCegarLoop]: Interpolant automaton has 95 states [2021-05-02 12:14:03,949 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:14:03,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2021-05-02 12:14:03,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=8543, Unknown=0, NotChecked=0, Total=8930 [2021-05-02 12:14:03,950 INFO L87 Difference]: Start difference. First operand 285 states and 295 transitions. Second operand has 95 states, 95 states have (on average 1.831578947368421) internal successors, (174), 94 states have internal predecessors, (174), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:14:10,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:14:10,002 INFO L93 Difference]: Finished difference Result 331 states and 346 transitions. [2021-05-02 12:14:10,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-05-02 12:14:10,003 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 1.831578947368421) internal successors, (174), 94 states have internal predecessors, (174), 2 states have call successors, (4), 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 284 [2021-05-02 12:14:10,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:14:10,004 INFO L225 Difference]: With dead ends: 331 [2021-05-02 12:14:10,004 INFO L226 Difference]: Without dead ends: 310 [2021-05-02 12:14:10,005 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 206 SyntacticMatches, 11 SemanticMatches, 182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12064 ImplicationChecksByTransitivity, 6633.2ms TimeCoverageRelationStatistics Valid=1028, Invalid=32644, Unknown=0, NotChecked=0, Total=33672 [2021-05-02 12:14:10,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-05-02 12:14:10,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 298. [2021-05-02 12:14:10,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 293 states have (on average 1.0375426621160408) internal successors, (304), 293 states have internal predecessors, (304), 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 12:14:10,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 308 transitions. [2021-05-02 12:14:10,057 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 308 transitions. Word has length 284 [2021-05-02 12:14:10,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:14:10,057 INFO L480 AbstractCegarLoop]: Abstraction has 298 states and 308 transitions. [2021-05-02 12:14:10,057 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 95 states, 95 states have (on average 1.831578947368421) internal successors, (174), 94 states have internal predecessors, (174), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:14:10,057 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 308 transitions. [2021-05-02 12:14:10,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2021-05-02 12:14:10,058 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:14:10,058 INFO L523 BasicCegarLoop]: trace histogram [220, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:14:10,264 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-02 12:14:10,264 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:14:10,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:14:10,265 INFO L82 PathProgramCache]: Analyzing trace with hash -482736823, now seen corresponding path program 28 times [2021-05-02 12:14:10,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:14:10,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436647132] [2021-05-02 12:14:10,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:14:10,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:14:10,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:14:10,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:14:10,724 INFO L134 CoverageAnalysis]: Checked inductivity of 29645 backedges. 0 proven. 28435 refuted. 0 times theorem prover too weak. 1210 trivial. 0 not checked. [2021-05-02 12:14:10,724 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:14:10,724 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436647132] [2021-05-02 12:14:10,724 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436647132] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:14:10,724 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000543828] [2021-05-02 12:14:10,724 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:14:10,790 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:14:10,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:14:10,791 WARN L261 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 52 conjunts are in the unsatisfiable core [2021-05-02 12:14:10,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:14:11,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:11,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:11,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:11,296 INFO L134 CoverageAnalysis]: Checked inductivity of 29645 backedges. 0 proven. 28435 refuted. 0 times theorem prover too weak. 1210 trivial. 0 not checked. [2021-05-02 12:14:11,296 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1000543828] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:14:11,296 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:14:11,296 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27] total 29 [2021-05-02 12:14:11,297 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352417286] [2021-05-02 12:14:11,298 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 12:14:11,298 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:14:11,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 12:14:11,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=734, Unknown=0, NotChecked=0, Total=812 [2021-05-02 12:14:11,298 INFO L87 Difference]: Start difference. First operand 298 states and 308 transitions. Second operand has 29 states, 29 states have (on average 3.4482758620689653) internal successors, (100), 27 states have internal predecessors, (100), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:14:12,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:14:12,971 INFO L93 Difference]: Finished difference Result 328 states and 340 transitions. [2021-05-02 12:14:12,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 12:14:12,971 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.4482758620689653) internal successors, (100), 27 states have internal predecessors, (100), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 297 [2021-05-02 12:14:12,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:14:12,972 INFO L225 Difference]: With dead ends: 328 [2021-05-02 12:14:12,972 INFO L226 Difference]: Without dead ends: 323 [2021-05-02 12:14:12,973 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 347 GetRequests, 296 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 1043.6ms TimeCoverageRelationStatistics Valid=193, Invalid=2459, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 12:14:12,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2021-05-02 12:14:13,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 311. [2021-05-02 12:14:13,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 306 states have (on average 1.0392156862745099) internal successors, (318), 306 states have internal predecessors, (318), 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 12:14:13,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 322 transitions. [2021-05-02 12:14:13,029 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 322 transitions. Word has length 297 [2021-05-02 12:14:13,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:14:13,029 INFO L480 AbstractCegarLoop]: Abstraction has 311 states and 322 transitions. [2021-05-02 12:14:13,029 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 3.4482758620689653) internal successors, (100), 27 states have internal predecessors, (100), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:14:13,029 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 322 transitions. [2021-05-02 12:14:13,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2021-05-02 12:14:13,030 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:14:13,030 INFO L523 BasicCegarLoop]: trace histogram [230, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:14:13,231 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:14:13,231 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:14:13,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:14:13,231 INFO L82 PathProgramCache]: Analyzing trace with hash 2017901155, now seen corresponding path program 29 times [2021-05-02 12:14:13,231 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:14:13,231 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836250475] [2021-05-02 12:14:13,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:14:13,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:14:13,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:14:13,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:14:13,770 INFO L134 CoverageAnalysis]: Checked inductivity of 32407 backedges. 0 proven. 31142 refuted. 0 times theorem prover too weak. 1265 trivial. 0 not checked. [2021-05-02 12:14:13,770 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:14:13,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836250475] [2021-05-02 12:14:13,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836250475] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:14:13,771 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [487969779] [2021-05-02 12:14:13,771 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:14:54,176 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 104 check-sat command(s) [2021-05-02 12:14:54,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:14:54,198 WARN L261 TraceCheckSpWp]: Trace formula consists of 915 conjuncts, 681 conjunts are in the unsatisfiable core [2021-05-02 12:14:54,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:14:54,232 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:54,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:54,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:54,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:54,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:54,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:54,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:54,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:55,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:55,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:55,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:56,763 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:57,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:58,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:14:59,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:15:09,143 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:15:13,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:15:13,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:15:13,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:15:13,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:15:13,278 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:15:13,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:15:13,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:15:13,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:15:13,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:15:14,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:15:14,181 INFO L134 CoverageAnalysis]: Checked inductivity of 32407 backedges. 255 proven. 31992 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2021-05-02 12:15:14,181 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [487969779] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:15:14,181 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:15:14,181 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 231] total 233 [2021-05-02 12:15:14,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [605058626] [2021-05-02 12:15:14,182 INFO L460 AbstractCegarLoop]: Interpolant automaton has 233 states [2021-05-02 12:15:14,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:15:14,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 233 interpolants. [2021-05-02 12:15:14,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1072, Invalid=52984, Unknown=0, NotChecked=0, Total=54056 [2021-05-02 12:15:14,184 INFO L87 Difference]: Start difference. First operand 311 states and 322 transitions. Second operand has 233 states, 233 states have (on average 1.4120171673819744) internal successors, (329), 232 states have internal predecessors, (329), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:15:40,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:15:40,370 INFO L93 Difference]: Finished difference Result 604 states and 629 transitions. [2021-05-02 12:15:40,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 220 states. [2021-05-02 12:15:40,370 INFO L78 Accepts]: Start accepts. Automaton has has 233 states, 233 states have (on average 1.4120171673819744) internal successors, (329), 232 states have internal predecessors, (329), 2 states have call successors, (4), 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 310 [2021-05-02 12:15:40,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:15:40,372 INFO L225 Difference]: With dead ends: 604 [2021-05-02 12:15:40,372 INFO L226 Difference]: Without dead ends: 336 [2021-05-02 12:15:40,379 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 555 GetRequests, 99 SyntacticMatches, 8 SemanticMatches, 448 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87543 ImplicationChecksByTransitivity, 28651.1ms TimeCoverageRelationStatistics Valid=2799, Invalid=199251, Unknown=0, NotChecked=0, Total=202050 [2021-05-02 12:15:40,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2021-05-02 12:15:40,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 324. [2021-05-02 12:15:40,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 319 states have (on average 1.0188087774294672) internal successors, (325), 319 states have internal predecessors, (325), 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 12:15:40,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 329 transitions. [2021-05-02 12:15:40,448 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 329 transitions. Word has length 310 [2021-05-02 12:15:40,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:15:40,449 INFO L480 AbstractCegarLoop]: Abstraction has 324 states and 329 transitions. [2021-05-02 12:15:40,449 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 233 states, 233 states have (on average 1.4120171673819744) internal successors, (329), 232 states have internal predecessors, (329), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:15:40,449 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 329 transitions. [2021-05-02 12:15:40,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 324 [2021-05-02 12:15:40,450 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:15:40,450 INFO L523 BasicCegarLoop]: trace histogram [240, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:15:40,659 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 12:15:40,660 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:15:40,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:15:40,660 INFO L82 PathProgramCache]: Analyzing trace with hash 919510921, now seen corresponding path program 30 times [2021-05-02 12:15:40,660 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:15:40,660 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139333082] [2021-05-02 12:15:40,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:15:40,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:15:41,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:15:41,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:15:41,253 INFO L134 CoverageAnalysis]: Checked inductivity of 35292 backedges. 0 proven. 33972 refuted. 0 times theorem prover too weak. 1320 trivial. 0 not checked. [2021-05-02 12:15:41,253 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:15:41,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139333082] [2021-05-02 12:15:41,253 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1139333082] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:15:41,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957632576] [2021-05-02 12:15:41,253 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:16:13,137 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 107 check-sat command(s) [2021-05-02 12:16:13,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:16:13,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 915 conjuncts, 85 conjunts are in the unsatisfiable core [2021-05-02 12:16:13,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:16:13,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:13,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:13,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:13,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:13,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:13,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:14,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:14,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:14,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:14,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:14,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:14,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:14,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:14,300 INFO L134 CoverageAnalysis]: Checked inductivity of 35292 backedges. 36 proven. 33985 refuted. 0 times theorem prover too weak. 1271 trivial. 0 not checked. [2021-05-02 12:16:14,301 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957632576] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:16:14,301 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:16:14,301 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 34] total 36 [2021-05-02 12:16:14,301 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859476097] [2021-05-02 12:16:14,301 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:16:14,301 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:16:14,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:16:14,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1137, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:16:14,302 INFO L87 Difference]: Start difference. First operand 324 states and 329 transitions. Second operand has 36 states, 36 states have (on average 3.1666666666666665) internal successors, (114), 35 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:16:16,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:16:16,995 INFO L93 Difference]: Finished difference Result 354 states and 361 transitions. [2021-05-02 12:16:16,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:16:16,996 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.1666666666666665) internal successors, (114), 35 states have internal predecessors, (114), 2 states have call successors, (4), 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 323 [2021-05-02 12:16:16,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:16:16,997 INFO L225 Difference]: With dead ends: 354 [2021-05-02 12:16:16,997 INFO L226 Difference]: Without dead ends: 349 [2021-05-02 12:16:16,998 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 315 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 2159.2ms TimeCoverageRelationStatistics Valid=339, Invalid=4217, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:16:16,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2021-05-02 12:16:17,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 337. [2021-05-02 12:16:17,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 332 states have (on average 1.0210843373493976) internal successors, (339), 332 states have internal predecessors, (339), 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 12:16:17,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 343 transitions. [2021-05-02 12:16:17,063 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 343 transitions. Word has length 323 [2021-05-02 12:16:17,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:16:17,064 INFO L480 AbstractCegarLoop]: Abstraction has 337 states and 343 transitions. [2021-05-02 12:16:17,064 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 3.1666666666666665) internal successors, (114), 35 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:16:17,064 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 343 transitions. [2021-05-02 12:16:17,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2021-05-02 12:16:17,065 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:16:17,065 INFO L523 BasicCegarLoop]: trace histogram [250, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:16:17,265 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:16:17,266 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:16:17,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:16:17,266 INFO L82 PathProgramCache]: Analyzing trace with hash 2012137507, now seen corresponding path program 31 times [2021-05-02 12:16:17,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:16:17,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994958388] [2021-05-02 12:16:17,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:16:17,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:16:17,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:16:17,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:16:17,915 INFO L134 CoverageAnalysis]: Checked inductivity of 38300 backedges. 0 proven. 36925 refuted. 0 times theorem prover too weak. 1375 trivial. 0 not checked. [2021-05-02 12:16:17,915 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:16:17,915 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994958388] [2021-05-02 12:16:17,915 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [994958388] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:16:17,915 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432925665] [2021-05-02 12:16:17,915 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:16:18,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:16:18,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 987 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 12:16:18,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:16:18,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:18,652 INFO L134 CoverageAnalysis]: Checked inductivity of 38300 backedges. 0 proven. 36925 refuted. 0 times theorem prover too weak. 1375 trivial. 0 not checked. [2021-05-02 12:16:18,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432925665] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:16:18,652 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:16:18,652 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 12:16:18,652 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482120930] [2021-05-02 12:16:18,653 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 12:16:18,653 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:16:18,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 12:16:18,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 12:16:18,653 INFO L87 Difference]: Start difference. First operand 337 states and 343 transitions. Second operand has 30 states, 30 states have (on average 3.6666666666666665) internal successors, (110), 29 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:16:20,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:16:20,830 INFO L93 Difference]: Finished difference Result 367 states and 375 transitions. [2021-05-02 12:16:20,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 12:16:20,830 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.6666666666666665) internal successors, (110), 29 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 336 [2021-05-02 12:16:20,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:16:20,831 INFO L225 Difference]: With dead ends: 367 [2021-05-02 12:16:20,831 INFO L226 Difference]: Without dead ends: 362 [2021-05-02 12:16:20,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 337 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1316.4ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 12:16:20,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2021-05-02 12:16:20,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 350. [2021-05-02 12:16:20,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 350 states, 345 states have (on average 1.0231884057971015) internal successors, (353), 345 states have internal predecessors, (353), 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 12:16:20,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 357 transitions. [2021-05-02 12:16:20,904 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 357 transitions. Word has length 336 [2021-05-02 12:16:20,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:16:20,904 INFO L480 AbstractCegarLoop]: Abstraction has 350 states and 357 transitions. [2021-05-02 12:16:20,904 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.6666666666666665) internal successors, (110), 29 states have internal predecessors, (110), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:16:20,904 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 357 transitions. [2021-05-02 12:16:20,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2021-05-02 12:16:20,906 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:16:20,906 INFO L523 BasicCegarLoop]: trace histogram [260, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:16:21,128 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 12:16:21,128 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:16:21,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:16:21,128 INFO L82 PathProgramCache]: Analyzing trace with hash -1850021431, now seen corresponding path program 32 times [2021-05-02 12:16:21,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:16:21,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417743342] [2021-05-02 12:16:21,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:16:21,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:16:21,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:16:21,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:16:21,831 INFO L134 CoverageAnalysis]: Checked inductivity of 41431 backedges. 0 proven. 40001 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2021-05-02 12:16:21,831 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:16:21,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417743342] [2021-05-02 12:16:21,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417743342] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:16:21,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797015321] [2021-05-02 12:16:21,832 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 12:16:22,011 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:16:22,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:16:22,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 1023 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 12:16:22,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:16:22,622 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:22,629 INFO L134 CoverageAnalysis]: Checked inductivity of 41431 backedges. 0 proven. 40001 refuted. 0 times theorem prover too weak. 1430 trivial. 0 not checked. [2021-05-02 12:16:22,630 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [797015321] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:16:22,630 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:16:22,630 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 12:16:22,630 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529965361] [2021-05-02 12:16:22,631 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 12:16:22,631 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:16:22,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 12:16:22,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 12:16:22,631 INFO L87 Difference]: Start difference. First operand 350 states and 357 transitions. Second operand has 31 states, 31 states have (on average 3.6774193548387095) internal successors, (114), 30 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:16:24,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:16:24,968 INFO L93 Difference]: Finished difference Result 380 states and 389 transitions. [2021-05-02 12:16:24,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 12:16:24,969 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.6774193548387095) internal successors, (114), 30 states have internal predecessors, (114), 2 states have call successors, (4), 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 349 [2021-05-02 12:16:24,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:16:24,970 INFO L225 Difference]: With dead ends: 380 [2021-05-02 12:16:24,970 INFO L226 Difference]: Without dead ends: 375 [2021-05-02 12:16:24,971 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 350 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1352.9ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 12:16:24,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2021-05-02 12:16:25,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 363. [2021-05-02 12:16:25,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 358 states have (on average 1.0251396648044693) internal successors, (367), 358 states have internal predecessors, (367), 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 12:16:25,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 371 transitions. [2021-05-02 12:16:25,072 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 371 transitions. Word has length 349 [2021-05-02 12:16:25,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:16:25,073 INFO L480 AbstractCegarLoop]: Abstraction has 363 states and 371 transitions. [2021-05-02 12:16:25,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 3.6774193548387095) internal successors, (114), 30 states have internal predecessors, (114), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:16:25,073 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 371 transitions. [2021-05-02 12:16:25,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2021-05-02 12:16:25,074 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:16:25,074 INFO L523 BasicCegarLoop]: trace histogram [270, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:16:25,292 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 12:16:25,292 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:16:25,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:16:25,292 INFO L82 PathProgramCache]: Analyzing trace with hash -801298973, now seen corresponding path program 33 times [2021-05-02 12:16:25,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:16:25,292 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462280211] [2021-05-02 12:16:25,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:16:25,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:16:25,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:16:25,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:16:25,962 INFO L134 CoverageAnalysis]: Checked inductivity of 44685 backedges. 0 proven. 43200 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2021-05-02 12:16:25,962 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:16:25,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462280211] [2021-05-02 12:16:25,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [462280211] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:16:25,962 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1915071188] [2021-05-02 12:16:25,962 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:16:43,145 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 118 check-sat command(s) [2021-05-02 12:16:43,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:16:43,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 1029 conjuncts, 499 conjunts are in the unsatisfiable core [2021-05-02 12:16:43,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:16:45,675 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:45,677 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:45,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:45,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:45,684 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:46,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:46,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:46,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:46,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:46,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:46,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:46,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:46,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:46,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:46,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,428 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,465 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,655 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:47,662 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:48,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:48,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:48,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:48,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:49,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:50,603 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:50,604 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:50,715 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:51,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:51,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:51,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:51,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:51,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:52,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:53,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:53,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:53,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:53,589 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:54,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:16:54,678 INFO L134 CoverageAnalysis]: Checked inductivity of 44685 backedges. 198 proven. 43862 refuted. 0 times theorem prover too weak. 625 trivial. 0 not checked. [2021-05-02 12:16:54,679 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1915071188] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:16:54,679 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:16:54,679 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 173] total 175 [2021-05-02 12:16:54,679 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406018914] [2021-05-02 12:16:54,679 INFO L460 AbstractCegarLoop]: Interpolant automaton has 175 states [2021-05-02 12:16:54,679 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:16:54,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 175 interpolants. [2021-05-02 12:16:54,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=777, Invalid=29673, Unknown=0, NotChecked=0, Total=30450 [2021-05-02 12:16:54,681 INFO L87 Difference]: Start difference. First operand 363 states and 371 transitions. Second operand has 175 states, 175 states have (on average 1.6342857142857143) internal successors, (286), 174 states have internal predecessors, (286), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:17:09,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:17:09,542 INFO L93 Difference]: Finished difference Result 461 states and 478 transitions. [2021-05-02 12:17:09,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2021-05-02 12:17:09,543 INFO L78 Accepts]: Start accepts. Automaton has has 175 states, 175 states have (on average 1.6342857142857143) internal successors, (286), 174 states have internal predecessors, (286), 2 states have call successors, (4), 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 362 [2021-05-02 12:17:09,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:17:09,544 INFO L225 Difference]: With dead ends: 461 [2021-05-02 12:17:09,544 INFO L226 Difference]: Without dead ends: 388 [2021-05-02 12:17:09,548 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 215 SyntacticMatches, 6 SemanticMatches, 331 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44537 ImplicationChecksByTransitivity, 18053.1ms TimeCoverageRelationStatistics Valid=1969, Invalid=108587, Unknown=0, NotChecked=0, Total=110556 [2021-05-02 12:17:09,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2021-05-02 12:17:09,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 376. [2021-05-02 12:17:09,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 376 states, 371 states have (on average 1.0215633423180592) internal successors, (379), 371 states have internal predecessors, (379), 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 12:17:09,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 376 states to 376 states and 383 transitions. [2021-05-02 12:17:09,628 INFO L78 Accepts]: Start accepts. Automaton has 376 states and 383 transitions. Word has length 362 [2021-05-02 12:17:09,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:17:09,628 INFO L480 AbstractCegarLoop]: Abstraction has 376 states and 383 transitions. [2021-05-02 12:17:09,628 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 175 states, 175 states have (on average 1.6342857142857143) internal successors, (286), 174 states have internal predecessors, (286), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:17:09,628 INFO L276 IsEmpty]: Start isEmpty. Operand 376 states and 383 transitions. [2021-05-02 12:17:09,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 376 [2021-05-02 12:17:09,630 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:17:09,630 INFO L523 BasicCegarLoop]: trace histogram [280, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:17:09,839 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 12:17:09,839 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:17:09,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:17:09,839 INFO L82 PathProgramCache]: Analyzing trace with hash -1597840375, now seen corresponding path program 34 times [2021-05-02 12:17:09,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:17:09,839 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200002861] [2021-05-02 12:17:09,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:17:09,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:17:10,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:17:10,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:17:10,549 INFO L134 CoverageAnalysis]: Checked inductivity of 48062 backedges. 0 proven. 46522 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2021-05-02 12:17:10,550 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:17:10,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200002861] [2021-05-02 12:17:10,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200002861] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:17:10,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1238754907] [2021-05-02 12:17:10,550 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:17:10,614 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:17:10,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:17:10,615 WARN L261 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 64 conjunts are in the unsatisfiable core [2021-05-02 12:17:10,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:17:11,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:17:11,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:17:11,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:17:11,381 INFO L134 CoverageAnalysis]: Checked inductivity of 48062 backedges. 0 proven. 46522 refuted. 0 times theorem prover too weak. 1540 trivial. 0 not checked. [2021-05-02 12:17:11,381 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1238754907] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:17:11,381 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:17:11,381 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 33] total 35 [2021-05-02 12:17:11,381 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623931522] [2021-05-02 12:17:11,382 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 12:17:11,382 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:17:11,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 12:17:11,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1094, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 12:17:11,382 INFO L87 Difference]: Start difference. First operand 376 states and 383 transitions. Second operand has 35 states, 35 states have (on average 3.5428571428571427) internal successors, (124), 33 states have internal predecessors, (124), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:17:14,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:17:14,133 INFO L93 Difference]: Finished difference Result 406 states and 415 transitions. [2021-05-02 12:17:14,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 12:17:14,134 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.5428571428571427) internal successors, (124), 33 states have internal predecessors, (124), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 375 [2021-05-02 12:17:14,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:17:14,135 INFO L225 Difference]: With dead ends: 406 [2021-05-02 12:17:14,135 INFO L226 Difference]: Without dead ends: 401 [2021-05-02 12:17:14,135 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 374 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 1618.3ms TimeCoverageRelationStatistics Valid=241, Invalid=3791, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 12:17:14,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-05-02 12:17:14,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 389. [2021-05-02 12:17:14,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 389 states, 384 states have (on average 1.0234375) internal successors, (393), 384 states have internal predecessors, (393), 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 12:17:14,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 397 transitions. [2021-05-02 12:17:14,221 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 397 transitions. Word has length 375 [2021-05-02 12:17:14,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:17:14,221 INFO L480 AbstractCegarLoop]: Abstraction has 389 states and 397 transitions. [2021-05-02 12:17:14,221 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 3.5428571428571427) internal successors, (124), 33 states have internal predecessors, (124), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:17:14,221 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 397 transitions. [2021-05-02 12:17:14,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 389 [2021-05-02 12:17:14,223 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:17:14,223 INFO L523 BasicCegarLoop]: trace histogram [290, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:17:14,436 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-02 12:17:14,437 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:17:14,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:17:14,437 INFO L82 PathProgramCache]: Analyzing trace with hash -1293036637, now seen corresponding path program 35 times [2021-05-02 12:17:14,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:17:14,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675796926] [2021-05-02 12:17:14,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:17:14,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:17:15,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:17:15,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:17:15,206 INFO L134 CoverageAnalysis]: Checked inductivity of 51562 backedges. 0 proven. 49967 refuted. 0 times theorem prover too weak. 1595 trivial. 0 not checked. [2021-05-02 12:17:15,206 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:17:15,206 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675796926] [2021-05-02 12:17:15,207 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675796926] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:17:15,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1792531898] [2021-05-02 12:17:15,207 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:07,715 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 130 check-sat command(s) [2021-05-02 12:19:07,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:19:07,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 1131 conjuncts, 486 conjunts are in the unsatisfiable core [2021-05-02 12:19:07,759 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:19:07,875 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,897 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,900 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,949 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,994 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:07,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,046 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:08,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:09,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:09,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:09,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:09,778 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:09,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:09,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:09,784 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:09,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:10,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,863 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,867 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,876 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,880 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:16,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:19:18,843 INFO L134 CoverageAnalysis]: Checked inductivity of 51562 backedges. 123 proven. 50531 refuted. 0 times theorem prover too weak. 908 trivial. 0 not checked. [2021-05-02 12:19:18,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1792531898] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:18,844 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:19:18,844 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 157] total 159 [2021-05-02 12:19:18,844 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481310770] [2021-05-02 12:19:18,844 INFO L460 AbstractCegarLoop]: Interpolant automaton has 159 states [2021-05-02 12:19:18,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:19:18,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 159 interpolants. [2021-05-02 12:19:18,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=626, Invalid=24496, Unknown=0, NotChecked=0, Total=25122 [2021-05-02 12:19:18,845 INFO L87 Difference]: Start difference. First operand 389 states and 397 transitions. Second operand has 159 states, 159 states have (on average 1.679245283018868) internal successors, (267), 158 states have internal predecessors, (267), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:35,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:19:35,035 INFO L93 Difference]: Finished difference Result 578 states and 597 transitions. [2021-05-02 12:19:35,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 151 states. [2021-05-02 12:19:35,036 INFO L78 Accepts]: Start accepts. Automaton has has 159 states, 159 states have (on average 1.679245283018868) internal successors, (267), 158 states have internal predecessors, (267), 2 states have call successors, (4), 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 388 [2021-05-02 12:19:35,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:19:35,037 INFO L225 Difference]: With dead ends: 578 [2021-05-02 12:19:35,037 INFO L226 Difference]: Without dead ends: 414 [2021-05-02 12:19:35,040 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 570 GetRequests, 249 SyntacticMatches, 16 SemanticMatches, 305 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36885 ImplicationChecksByTransitivity, 17644.0ms TimeCoverageRelationStatistics Valid=1601, Invalid=92341, Unknown=0, NotChecked=0, Total=93942 [2021-05-02 12:19:35,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2021-05-02 12:19:35,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 402. [2021-05-02 12:19:35,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 397 states have (on average 1.022670025188917) internal successors, (406), 397 states have internal predecessors, (406), 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 12:19:35,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 410 transitions. [2021-05-02 12:19:35,141 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 410 transitions. Word has length 388 [2021-05-02 12:19:35,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:19:35,141 INFO L480 AbstractCegarLoop]: Abstraction has 402 states and 410 transitions. [2021-05-02 12:19:35,141 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 159 states, 159 states have (on average 1.679245283018868) internal successors, (267), 158 states have internal predecessors, (267), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:19:35,141 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 410 transitions. [2021-05-02 12:19:35,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 402 [2021-05-02 12:19:35,143 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:19:35,143 INFO L523 BasicCegarLoop]: trace histogram [300, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:19:35,355 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:19:35,355 INFO L428 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:19:35,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:19:35,356 INFO L82 PathProgramCache]: Analyzing trace with hash -475361719, now seen corresponding path program 36 times [2021-05-02 12:19:35,356 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:19:35,356 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928780999] [2021-05-02 12:19:35,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:19:35,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:36,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:19:36,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:19:36,221 INFO L134 CoverageAnalysis]: Checked inductivity of 55185 backedges. 0 proven. 53535 refuted. 0 times theorem prover too weak. 1650 trivial. 0 not checked. [2021-05-02 12:19:36,221 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:19:36,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928780999] [2021-05-02 12:19:36,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928780999] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:19:36,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893661491] [2021-05-02 12:19:36,221 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:18,630 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 133 check-sat command(s) [2021-05-02 12:20:18,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:18,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 1131 conjuncts, 150 conjunts are in the unsatisfiable core [2021-05-02 12:20:18,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:18,956 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:18,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:19,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:19,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:19,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:19,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:19,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:19,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:19,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:19,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:19,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:19,884 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:19,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:19,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:19,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:20,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:20,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:20,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:21,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:21,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:21,218 INFO L134 CoverageAnalysis]: Checked inductivity of 55185 backedges. 40 proven. 53669 refuted. 0 times theorem prover too weak. 1476 trivial. 0 not checked. [2021-05-02 12:20:21,218 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893661491] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:21,218 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:21,218 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 61] total 63 [2021-05-02 12:20:21,218 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195278621] [2021-05-02 12:20:21,219 INFO L460 AbstractCegarLoop]: Interpolant automaton has 63 states [2021-05-02 12:20:21,219 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:21,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-05-02 12:20:21,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=3680, Unknown=0, NotChecked=0, Total=3906 [2021-05-02 12:20:21,219 INFO L87 Difference]: Start difference. First operand 402 states and 410 transitions. Second operand has 63 states, 63 states have (on average 2.6031746031746033) internal successors, (164), 62 states have internal predecessors, (164), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:26,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:26,580 INFO L93 Difference]: Finished difference Result 432 states and 442 transitions. [2021-05-02 12:20:26,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2021-05-02 12:20:26,581 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 2.6031746031746033) internal successors, (164), 62 states have internal predecessors, (164), 2 states have call successors, (4), 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 401 [2021-05-02 12:20:26,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:26,582 INFO L225 Difference]: With dead ends: 432 [2021-05-02 12:20:26,582 INFO L226 Difference]: Without dead ends: 427 [2021-05-02 12:20:26,583 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 492 GetRequests, 372 SyntacticMatches, 3 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3279 ImplicationChecksByTransitivity, 4868.8ms TimeCoverageRelationStatistics Valid=570, Invalid=13472, Unknown=0, NotChecked=0, Total=14042 [2021-05-02 12:20:26,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 427 states. [2021-05-02 12:20:26,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 427 to 415. [2021-05-02 12:20:26,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 410 states have (on average 1.024390243902439) internal successors, (420), 410 states have internal predecessors, (420), 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 12:20:26,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 424 transitions. [2021-05-02 12:20:26,696 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 424 transitions. Word has length 401 [2021-05-02 12:20:26,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:26,697 INFO L480 AbstractCegarLoop]: Abstraction has 415 states and 424 transitions. [2021-05-02 12:20:26,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 63 states, 63 states have (on average 2.6031746031746033) internal successors, (164), 62 states have internal predecessors, (164), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:26,697 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 424 transitions. [2021-05-02 12:20:26,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2021-05-02 12:20:26,698 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:26,698 INFO L523 BasicCegarLoop]: trace histogram [310, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:26,899 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable42 [2021-05-02 12:20:26,899 INFO L428 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:26,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:26,899 INFO L82 PathProgramCache]: Analyzing trace with hash 1589432675, now seen corresponding path program 37 times [2021-05-02 12:20:26,899 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:26,899 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921054095] [2021-05-02 12:20:26,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:27,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:27,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:27,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:27,868 INFO L134 CoverageAnalysis]: Checked inductivity of 58931 backedges. 0 proven. 57226 refuted. 0 times theorem prover too weak. 1705 trivial. 0 not checked. [2021-05-02 12:20:27,868 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:27,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921054095] [2021-05-02 12:20:27,868 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [921054095] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:27,868 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [819672255] [2021-05-02 12:20:27,868 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:28,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:28,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 1203 conjuncts, 65 conjunts are in the unsatisfiable core [2021-05-02 12:20:28,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:28,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:28,902 INFO L134 CoverageAnalysis]: Checked inductivity of 58931 backedges. 0 proven. 57226 refuted. 0 times theorem prover too weak. 1705 trivial. 0 not checked. [2021-05-02 12:20:28,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [819672255] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:28,903 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:28,903 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 12:20:28,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838817355] [2021-05-02 12:20:28,903 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 12:20:28,903 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:28,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 12:20:28,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 12:20:28,904 INFO L87 Difference]: Start difference. First operand 415 states and 424 transitions. Second operand has 36 states, 36 states have (on average 3.7222222222222223) internal successors, (134), 35 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:32,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:32,534 INFO L93 Difference]: Finished difference Result 445 states and 456 transitions. [2021-05-02 12:20:32,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 12:20:32,535 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.7222222222222223) internal successors, (134), 35 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 414 [2021-05-02 12:20:32,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:32,536 INFO L225 Difference]: With dead ends: 445 [2021-05-02 12:20:32,537 INFO L226 Difference]: Without dead ends: 440 [2021-05-02 12:20:32,537 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 482 GetRequests, 415 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 2045.0ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 12:20:32,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2021-05-02 12:20:32,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 428. [2021-05-02 12:20:32,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 428 states, 423 states have (on average 1.0260047281323876) internal successors, (434), 423 states have internal predecessors, (434), 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 12:20:32,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 438 transitions. [2021-05-02 12:20:32,639 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 438 transitions. Word has length 414 [2021-05-02 12:20:32,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:32,639 INFO L480 AbstractCegarLoop]: Abstraction has 428 states and 438 transitions. [2021-05-02 12:20:32,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 3.7222222222222223) internal successors, (134), 35 states have internal predecessors, (134), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:32,639 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 438 transitions. [2021-05-02 12:20:32,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 428 [2021-05-02 12:20:32,641 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:32,641 INFO L523 BasicCegarLoop]: trace histogram [320, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:32,852 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-05-02 12:20:32,852 INFO L428 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:32,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:32,853 INFO L82 PathProgramCache]: Analyzing trace with hash -315234167, now seen corresponding path program 38 times [2021-05-02 12:20:32,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:32,853 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349268938] [2021-05-02 12:20:32,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:32,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:33,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:33,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:33,869 INFO L134 CoverageAnalysis]: Checked inductivity of 62800 backedges. 0 proven. 61040 refuted. 0 times theorem prover too weak. 1760 trivial. 0 not checked. [2021-05-02 12:20:33,869 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:33,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349268938] [2021-05-02 12:20:33,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349268938] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:33,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000809678] [2021-05-02 12:20:33,869 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 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:34,093 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 12:20:34,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:20:34,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 1239 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 12:20:34,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:20:35,028 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:20:35,038 INFO L134 CoverageAnalysis]: Checked inductivity of 62800 backedges. 0 proven. 61040 refuted. 0 times theorem prover too weak. 1760 trivial. 0 not checked. [2021-05-02 12:20:35,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1000809678] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:35,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:20:35,039 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2021-05-02 12:20:35,039 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26710056] [2021-05-02 12:20:35,039 INFO L460 AbstractCegarLoop]: Interpolant automaton has 37 states [2021-05-02 12:20:35,039 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:20:35,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-05-02 12:20:35,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 12:20:35,040 INFO L87 Difference]: Start difference. First operand 428 states and 438 transitions. Second operand has 37 states, 37 states have (on average 3.72972972972973) internal successors, (138), 36 states have internal predecessors, (138), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:38,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:20:38,928 INFO L93 Difference]: Finished difference Result 458 states and 470 transitions. [2021-05-02 12:20:38,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-05-02 12:20:38,929 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.72972972972973) internal successors, (138), 36 states have internal predecessors, (138), 2 states have call successors, (4), 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 427 [2021-05-02 12:20:38,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:20:38,931 INFO L225 Difference]: With dead ends: 458 [2021-05-02 12:20:38,931 INFO L226 Difference]: Without dead ends: 453 [2021-05-02 12:20:38,931 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 497 GetRequests, 428 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 532 ImplicationChecksByTransitivity, 2113.8ms TimeCoverageRelationStatistics Valid=269, Invalid=4561, Unknown=0, NotChecked=0, Total=4830 [2021-05-02 12:20:38,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2021-05-02 12:20:39,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 441. [2021-05-02 12:20:39,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 436 states have (on average 1.0275229357798166) internal successors, (448), 436 states have internal predecessors, (448), 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 12:20:39,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 452 transitions. [2021-05-02 12:20:39,073 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 452 transitions. Word has length 427 [2021-05-02 12:20:39,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:20:39,073 INFO L480 AbstractCegarLoop]: Abstraction has 441 states and 452 transitions. [2021-05-02 12:20:39,073 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 37 states, 37 states have (on average 3.72972972972973) internal successors, (138), 36 states have internal predecessors, (138), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:20:39,074 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 452 transitions. [2021-05-02 12:20:39,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 441 [2021-05-02 12:20:39,075 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:20:39,075 INFO L523 BasicCegarLoop]: trace histogram [330, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:20:39,289 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:20:39,289 INFO L428 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:20:39,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:20:39,289 INFO L82 PathProgramCache]: Analyzing trace with hash -546955485, now seen corresponding path program 39 times [2021-05-02 12:20:39,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:20:39,289 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971648241] [2021-05-02 12:20:39,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:20:39,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:40,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:20:40,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:20:40,276 INFO L134 CoverageAnalysis]: Checked inductivity of 66792 backedges. 0 proven. 64977 refuted. 0 times theorem prover too weak. 1815 trivial. 0 not checked. [2021-05-02 12:20:40,276 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:20:40,276 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971648241] [2021-05-02 12:20:40,276 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [971648241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:20:40,276 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719229830] [2021-05-02 12:20:40,276 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 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:12,545 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 144 check-sat command(s) [2021-05-02 12:21:12,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:12,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 1245 conjuncts, 125 conjunts are in the unsatisfiable core [2021-05-02 12:21:12,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:13,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:13,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:13,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:13,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:13,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:13,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:13,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:13,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:13,945 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:13,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:14,073 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:14,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:14,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:14,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:14,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:14,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:14,411 INFO L134 CoverageAnalysis]: Checked inductivity of 66792 backedges. 38 proven. 65032 refuted. 0 times theorem prover too weak. 1722 trivial. 0 not checked. [2021-05-02 12:21:14,411 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719229830] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:14,411 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:14,411 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 51] total 53 [2021-05-02 12:21:14,412 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069490172] [2021-05-02 12:21:14,412 INFO L460 AbstractCegarLoop]: Interpolant automaton has 53 states [2021-05-02 12:21:14,412 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:14,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-05-02 12:21:14,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=2587, Unknown=0, NotChecked=0, Total=2756 [2021-05-02 12:21:14,412 INFO L87 Difference]: Start difference. First operand 441 states and 452 transitions. Second operand has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:19,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:19,809 INFO L93 Difference]: Finished difference Result 471 states and 484 transitions. [2021-05-02 12:21:19,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2021-05-02 12:21:19,809 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 2 states have call successors, (4), 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 440 [2021-05-02 12:21:19,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:19,810 INFO L225 Difference]: With dead ends: 471 [2021-05-02 12:21:19,811 INFO L226 Difference]: Without dead ends: 466 [2021-05-02 12:21:19,811 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 526 GetRequests, 422 SyntacticMatches, 5 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1866 ImplicationChecksByTransitivity, 3821.0ms TimeCoverageRelationStatistics Valid=432, Invalid=9668, Unknown=0, NotChecked=0, Total=10100 [2021-05-02 12:21:19,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2021-05-02 12:21:19,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 454. [2021-05-02 12:21:19,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 449 states have (on average 1.0289532293986636) internal successors, (462), 449 states have internal predecessors, (462), 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 12:21:19,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 466 transitions. [2021-05-02 12:21:19,923 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 466 transitions. Word has length 440 [2021-05-02 12:21:19,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:19,923 INFO L480 AbstractCegarLoop]: Abstraction has 454 states and 466 transitions. [2021-05-02 12:21:19,923 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 53 states, 53 states have (on average 3.018867924528302) internal successors, (160), 52 states have internal predecessors, (160), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:19,923 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 466 transitions. [2021-05-02 12:21:19,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 454 [2021-05-02 12:21:19,925 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:19,925 INFO L523 BasicCegarLoop]: trace histogram [340, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:20,134 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-05-02 12:21:20,134 INFO L428 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:20,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:20,134 INFO L82 PathProgramCache]: Analyzing trace with hash -1557597495, now seen corresponding path program 40 times [2021-05-02 12:21:20,134 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:20,134 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411105867] [2021-05-02 12:21:20,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:20,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:21,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:21,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:21,131 INFO L134 CoverageAnalysis]: Checked inductivity of 70907 backedges. 0 proven. 69037 refuted. 0 times theorem prover too weak. 1870 trivial. 0 not checked. [2021-05-02 12:21:21,131 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:21,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411105867] [2021-05-02 12:21:21,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411105867] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:21,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998364262] [2021-05-02 12:21:21,131 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 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:21,210 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 12:21:21,210 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:21:21,211 WARN L261 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 76 conjunts are in the unsatisfiable core [2021-05-02 12:21:21,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:21:22,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:22,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:22,132 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:21:22,223 INFO L134 CoverageAnalysis]: Checked inductivity of 70907 backedges. 0 proven. 69037 refuted. 0 times theorem prover too weak. 1870 trivial. 0 not checked. [2021-05-02 12:21:22,224 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [998364262] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:22,224 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:21:22,224 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 39] total 41 [2021-05-02 12:21:22,224 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136330481] [2021-05-02 12:21:22,224 INFO L460 AbstractCegarLoop]: Interpolant automaton has 41 states [2021-05-02 12:21:22,224 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:21:22,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-05-02 12:21:22,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1526, Unknown=0, NotChecked=0, Total=1640 [2021-05-02 12:21:22,225 INFO L87 Difference]: Start difference. First operand 454 states and 466 transitions. Second operand has 41 states, 41 states have (on average 3.6097560975609757) internal successors, (148), 39 states have internal predecessors, (148), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:27,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 12:21:27,231 INFO L93 Difference]: Finished difference Result 484 states and 498 transitions. [2021-05-02 12:21:27,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 12:21:27,232 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.6097560975609757) internal successors, (148), 39 states have internal predecessors, (148), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 453 [2021-05-02 12:21:27,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 12:21:27,233 INFO L225 Difference]: With dead ends: 484 [2021-05-02 12:21:27,233 INFO L226 Difference]: Without dead ends: 479 [2021-05-02 12:21:27,234 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 527 GetRequests, 452 SyntacticMatches, 1 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 2560.5ms TimeCoverageRelationStatistics Valid=289, Invalid=5411, Unknown=0, NotChecked=0, Total=5700 [2021-05-02 12:21:27,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2021-05-02 12:21:27,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 467. [2021-05-02 12:21:27,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 462 states have (on average 1.0303030303030303) internal successors, (476), 462 states have internal predecessors, (476), 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 12:21:27,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 480 transitions. [2021-05-02 12:21:27,405 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 480 transitions. Word has length 453 [2021-05-02 12:21:27,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 12:21:27,406 INFO L480 AbstractCegarLoop]: Abstraction has 467 states and 480 transitions. [2021-05-02 12:21:27,406 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 41 states, 41 states have (on average 3.6097560975609757) internal successors, (148), 39 states have internal predecessors, (148), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 12:21:27,406 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 480 transitions. [2021-05-02 12:21:27,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 467 [2021-05-02 12:21:27,408 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 12:21:27,408 INFO L523 BasicCegarLoop]: trace histogram [350, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 12:21:27,629 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:21:27,630 INFO L428 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 12:21:27,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 12:21:27,630 INFO L82 PathProgramCache]: Analyzing trace with hash -844776221, now seen corresponding path program 41 times [2021-05-02 12:21:27,630 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 12:21:27,630 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1657348696] [2021-05-02 12:21:27,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 12:21:27,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:28,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 12:21:28,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 12:21:28,920 INFO L134 CoverageAnalysis]: Checked inductivity of 75145 backedges. 0 proven. 73220 refuted. 0 times theorem prover too weak. 1925 trivial. 0 not checked. [2021-05-02 12:21:28,920 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 12:21:28,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1657348696] [2021-05-02 12:21:28,920 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1657348696] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:21:28,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1002638171] [2021-05-02 12:21:28,920 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 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 12:24:39,338 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 156 check-sat command(s) [2021-05-02 12:24:39,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 12:24:39,372 WARN L261 TraceCheckSpWp]: Trace formula consists of 1347 conjuncts, 877 conjunts are in the unsatisfiable core [2021-05-02 12:24:39,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 12:24:39,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:39,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:40,080 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:40,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:40,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:40,111 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:40,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:40,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:41,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:43,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:45,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:47,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:47,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:47,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:47,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:47,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:47,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:24:48,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:11,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:11,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:11,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:11,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:11,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:11,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:11,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:13,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,892 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,908 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,969 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,974 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,987 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:14,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:15,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:15,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:15,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:15,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:15,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:15,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:15,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:15,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:15,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:16,444 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:16,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:16,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:16,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:16,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:16,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:16,461 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:16,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:19,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:19,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:19,307 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:19,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 12:25:19,935 INFO L134 CoverageAnalysis]: Checked inductivity of 75145 backedges. 297 proven. 74310 refuted. 0 times theorem prover too weak. 538 trivial. 0 not checked. [2021-05-02 12:25:19,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1002638171] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 12:25:19,935 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 12:25:19,935 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 292] total 294 [2021-05-02 12:25:19,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079310421] [2021-05-02 12:25:19,936 INFO L460 AbstractCegarLoop]: Interpolant automaton has 294 states [2021-05-02 12:25:19,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 12:25:19,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 294 interpolants. [2021-05-02 12:25:19,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1319, Invalid=84823, Unknown=0, NotChecked=0, Total=86142 [2021-05-02 12:25:19,939 INFO L87 Difference]: Start difference. First operand 467 states and 480 transitions. Second operand has 294 states, 294 states have (on average 1.469387755102041) internal successors, (432), 293 states have internal predecessors, (432), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)