/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_10.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:04:04,514 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:04:04,517 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:04:04,551 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:04:04,570 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:04:04,572 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:04:04,573 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:04:04,574 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:04:04,576 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:04:04,577 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:04:04,578 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:04:04,583 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:04:04,584 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:04:04,585 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:04:04,586 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:04:04,588 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:04:04,593 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:04:04,611 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:04:04,611 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:04:04,612 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:04:04,613 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 13:04:04,643 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:04:04,643 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:04:04,645 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:04:04,645 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:04:04,645 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:04:04,646 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:04:04,646 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:04:04,646 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:04:04,646 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:04:04,646 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:04:04,647 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:04:04,647 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:04:04,647 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:04:04,647 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:04:04,647 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:04:04,647 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:04:04,647 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:04:04,647 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:04:04,648 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:04:04,648 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:04:04,648 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:04:04,648 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:04:04,648 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:04:04,648 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:04:04,648 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:04:04,648 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:04:04,649 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:04:04,649 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:04:04,649 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:04:04,904 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:04:04,918 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:04:04,919 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:04:04,920 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:04:04,925 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:04:04,925 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/mono-crafted_10.c [2021-05-02 13:04:04,989 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/79bced47d/f0caf43589a9412d968b5d34d185a021/FLAG50a1ee9ca [2021-05-02 13:04:05,343 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:04:05,344 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_10.c [2021-05-02 13:04:05,351 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/79bced47d/f0caf43589a9412d968b5d34d185a021/FLAG50a1ee9ca [2021-05-02 13:04:05,772 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/79bced47d/f0caf43589a9412d968b5d34d185a021 [2021-05-02 13:04:05,775 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:04:05,776 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:04:05,779 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:04:05,779 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:04:05,782 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:04:05,783 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:04:05" (1/1) ... [2021-05-02 13:04:05,784 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17d55373 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:05, skipping insertion in model container [2021-05-02 13:04:05,784 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:04:05" (1/1) ... [2021-05-02 13:04:05,789 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:04:05,799 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:04:05,883 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_10.c[319,332] [2021-05-02 13:04:05,890 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:04:05,898 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:04:05,932 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/mono-crafted_10.c[319,332] [2021-05-02 13:04:05,934 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:04:05,946 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:04:05,946 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:05 WrapperNode [2021-05-02 13:04:05,947 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:04:05,948 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:04:05,948 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:04:05,949 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:04:05,956 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:05" (1/1) ... [2021-05-02 13:04:05,956 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:05" (1/1) ... [2021-05-02 13:04:05,964 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:05" (1/1) ... [2021-05-02 13:04:05,965 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:05" (1/1) ... [2021-05-02 13:04:05,972 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:05" (1/1) ... [2021-05-02 13:04:05,977 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:05" (1/1) ... [2021-05-02 13:04:05,981 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:05" (1/1) ... [2021-05-02 13:04:05,984 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:04:05,985 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:04:05,985 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:04:05,986 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:04:05,986 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:05" (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 13:04:06,053 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:04:06,053 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:04:06,053 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:04:06,053 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:04:06,053 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:04:06,053 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:04:06,054 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:04:06,054 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:04:06,054 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:04:06,054 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:04:06,054 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:04:06,054 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:04:06,055 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:04:06,055 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:04:06,055 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:04:06,055 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:04:06,056 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:04:06,263 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:04:06,263 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 13:04:06,277 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:04:06 BoogieIcfgContainer [2021-05-02 13:04:06,277 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:04:06,278 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:04:06,278 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:04:06,280 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:04:06,280 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:04:05" (1/3) ... [2021-05-02 13:04:06,281 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25e57326 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:04:06, skipping insertion in model container [2021-05-02 13:04:06,281 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:04:05" (2/3) ... [2021-05-02 13:04:06,281 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25e57326 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:04:06, skipping insertion in model container [2021-05-02 13:04:06,281 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:04:06" (3/3) ... [2021-05-02 13:04:06,282 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_10.c [2021-05-02 13:04:06,286 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:04:06,288 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:04:06,299 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:04:06,316 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:04:06,316 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:04:06,316 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:04:06,316 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:04:06,316 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:04:06,316 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:04:06,316 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:04:06,316 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:04:06,326 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:04:06,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:04:06,329 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:06,330 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:06,330 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:06,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:06,334 INFO L82 PathProgramCache]: Analyzing trace with hash -2135496849, now seen corresponding path program 1 times [2021-05-02 13:04:06,340 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:06,340 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997070309] [2021-05-02 13:04:06,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:06,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:06,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:06,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:06,507 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:06,507 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:06,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997070309] [2021-05-02 13:04:06,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997070309] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:04:06,508 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:04:06,508 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:04:06,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043577544] [2021-05-02 13:04:06,511 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:04:06,512 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:06,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:04:06,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:04:06,521 INFO L87 Difference]: Start difference. First operand has 21 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:06,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:06,554 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-05-02 13:04:06,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:04:06,555 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:04:06,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:06,560 INFO L225 Difference]: With dead ends: 33 [2021-05-02 13:04:06,560 INFO L226 Difference]: Without dead ends: 14 [2021-05-02 13:04:06,563 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:04:06,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-02 13:04:06,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-02 13:04:06,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:06,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-05-02 13:04:06,587 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2021-05-02 13:04:06,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:06,587 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-05-02 13:04:06,587 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:06,588 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-05-02 13:04:06,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:04:06,588 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:06,588 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:06,588 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:04:06,588 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:06,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:06,589 INFO L82 PathProgramCache]: Analyzing trace with hash -2145655580, now seen corresponding path program 1 times [2021-05-02 13:04:06,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:06,589 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611222753] [2021-05-02 13:04:06,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:06,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:06,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:06,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:06,715 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:06,715 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:06,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611222753] [2021-05-02 13:04:06,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611222753] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:04:06,716 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:04:06,716 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:04:06,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492796429] [2021-05-02 13:04:06,717 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:04:06,717 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:06,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:04:06,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:04:06,718 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:06,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:06,830 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2021-05-02 13:04:06,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:04:06,831 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:04:06,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:06,831 INFO L225 Difference]: With dead ends: 25 [2021-05-02 13:04:06,831 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 13:04:06,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 87.3ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:04:06,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 13:04:06,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 13:04:06,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:06,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-05-02 13:04:06,837 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-05-02 13:04:06,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:06,837 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-05-02 13:04:06,837 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:06,837 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-05-02 13:04:06,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 13:04:06,838 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:06,838 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:06,838 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:04:06,838 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:06,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:06,839 INFO L82 PathProgramCache]: Analyzing trace with hash -79339060, now seen corresponding path program 1 times [2021-05-02 13:04:06,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:06,839 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [458475851] [2021-05-02 13:04:06,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:06,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:06,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:06,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:06,999 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:07,000 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:07,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [458475851] [2021-05-02 13:04:07,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [458475851] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:07,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500934398] [2021-05-02 13:04:07,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:07,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:07,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 13:04:07,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:07,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:07,190 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:07,191 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1500934398] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:07,191 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:07,191 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 7 [2021-05-02 13:04:07,191 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692959267] [2021-05-02 13:04:07,191 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:04:07,191 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:07,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:04:07,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:04:07,192 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:07,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:07,287 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-02 13:04:07,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:04:07,287 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 13:04:07,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:07,288 INFO L225 Difference]: With dead ends: 28 [2021-05-02 13:04:07,288 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 13:04:07,288 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 137.8ms TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:04:07,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 13:04:07,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-05-02 13:04:07,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:07,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-05-02 13:04:07,292 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2021-05-02 13:04:07,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:07,292 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-05-02 13:04:07,292 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:07,292 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-05-02 13:04:07,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 13:04:07,293 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:07,293 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:07,511 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 13:04:07,512 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:07,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:07,512 INFO L82 PathProgramCache]: Analyzing trace with hash 2084821988, now seen corresponding path program 2 times [2021-05-02 13:04:07,512 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:07,513 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330147473] [2021-05-02 13:04:07,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:07,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:07,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:07,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:07,678 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:07,678 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:07,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330147473] [2021-05-02 13:04:07,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330147473] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:07,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478803756] [2021-05-02 13:04:07,679 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:07,717 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:04:07,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:07,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:04:07,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:07,817 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:07,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478803756] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:07,818 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:07,818 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 10 [2021-05-02 13:04:07,818 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574225723] [2021-05-02 13:04:07,819 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:04:07,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:07,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:04:07,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:04:07,820 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:07,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:07,960 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-02 13:04:07,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:04:07,961 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 13:04:07,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:07,962 INFO L225 Difference]: With dead ends: 31 [2021-05-02 13:04:07,962 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 13:04:07,963 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 173.0ms TimeCoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:04:07,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 13:04:07,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 13:04:07,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:07,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-05-02 13:04:07,972 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-05-02 13:04:07,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:07,972 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-05-02 13:04:07,972 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.2) internal successors, (22), 9 states have internal predecessors, (22), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:07,972 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-05-02 13:04:07,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 13:04:07,973 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:07,973 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:08,180 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:08,181 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:08,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:08,181 INFO L82 PathProgramCache]: Analyzing trace with hash -1442444596, now seen corresponding path program 3 times [2021-05-02 13:04:08,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:08,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988582779] [2021-05-02 13:04:08,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:08,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:08,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:08,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:08,352 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:08,353 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:08,354 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988582779] [2021-05-02 13:04:08,354 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988582779] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:08,354 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748493299] [2021-05-02 13:04:08,354 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:08,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:04:08,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:08,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 13:04:08,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:08,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:08,549 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-02 13:04:08,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748493299] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:08,550 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:08,550 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 11 [2021-05-02 13:04:08,550 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113935272] [2021-05-02 13:04:08,552 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:04:08,552 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:08,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:04:08,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:04:08,553 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:08,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:08,994 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2021-05-02 13:04:08,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:04:08,997 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2021-05-02 13:04:08,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:08,999 INFO L225 Difference]: With dead ends: 41 [2021-05-02 13:04:08,999 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 13:04:09,000 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 442.8ms TimeCoverageRelationStatistics Valid=100, Invalid=242, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:04:09,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 13:04:09,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2021-05-02 13:04:09,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:09,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-05-02 13:04:09,005 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 20 [2021-05-02 13:04:09,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:09,006 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-05-02 13:04:09,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.1818181818181817) internal successors, (24), 10 states have internal predecessors, (24), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:09,006 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-05-02 13:04:09,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 13:04:09,006 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:09,006 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:09,215 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:09,215 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:09,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:09,216 INFO L82 PathProgramCache]: Analyzing trace with hash -1653107870, now seen corresponding path program 1 times [2021-05-02 13:04:09,216 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:09,216 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936789269] [2021-05-02 13:04:09,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:09,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:09,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:09,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:09,309 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:09,309 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:09,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936789269] [2021-05-02 13:04:09,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936789269] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:09,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329617825] [2021-05-02 13:04:09,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:09,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:09,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 13:04:09,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:09,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:09,417 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 11 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:09,418 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1329617825] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:09,418 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:09,418 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:04:09,418 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372043557] [2021-05-02 13:04:09,418 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:04:09,418 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:09,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:04:09,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:04:09,419 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:09,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:09,626 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2021-05-02 13:04:09,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:04:09,627 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 13:04:09,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:09,628 INFO L225 Difference]: With dead ends: 44 [2021-05-02 13:04:09,628 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 13:04:09,629 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 186.1ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:04:09,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 13:04:09,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 13:04:09,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 28 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:09,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2021-05-02 13:04:09,639 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 29 [2021-05-02 13:04:09,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:09,639 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2021-05-02 13:04:09,640 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:09,640 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2021-05-02 13:04:09,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 13:04:09,642 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:09,642 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:09,858 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:09,858 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:09,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:09,859 INFO L82 PathProgramCache]: Analyzing trace with hash -366827958, now seen corresponding path program 2 times [2021-05-02 13:04:09,859 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:09,859 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973367678] [2021-05-02 13:04:09,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:09,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:09,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:09,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:09,984 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:09,984 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:09,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973367678] [2021-05-02 13:04:09,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973367678] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:09,985 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206176420] [2021-05-02 13:04:09,985 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:10,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:04:10,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:10,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 13:04:10,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:10,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:10,098 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 13 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:10,098 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1206176420] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:10,098 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:10,098 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 13:04:10,098 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811993564] [2021-05-02 13:04:10,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:04:10,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:10,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:04:10,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:04:10,100 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:10,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:10,345 INFO L93 Difference]: Finished difference Result 47 states and 50 transitions. [2021-05-02 13:04:10,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:04:10,346 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 32 [2021-05-02 13:04:10,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:10,346 INFO L225 Difference]: With dead ends: 47 [2021-05-02 13:04:10,346 INFO L226 Difference]: Without dead ends: 37 [2021-05-02 13:04:10,347 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 206.7ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:04:10,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-05-02 13:04:10,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2021-05-02 13:04:10,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 31 states have (on average 1.064516129032258) internal successors, (33), 31 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:10,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-05-02 13:04:10,351 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 32 [2021-05-02 13:04:10,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:10,351 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-05-02 13:04:10,351 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 10 states have internal predecessors, (32), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:10,351 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-05-02 13:04:10,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 13:04:10,352 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:10,352 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:10,568 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 13:04:10,568 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:10,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:10,568 INFO L82 PathProgramCache]: Analyzing trace with hash -500184478, now seen corresponding path program 3 times [2021-05-02 13:04:10,569 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:10,569 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936367124] [2021-05-02 13:04:10,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:10,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:10,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:10,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:10,693 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 15 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:04:10,693 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:10,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936367124] [2021-05-02 13:04:10,693 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1936367124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:10,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2008890742] [2021-05-02 13:04:10,693 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:10,773 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 13:04:10,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:10,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 13:04:10,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:10,873 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:10,880 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 33 proven. 2 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:04:10,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2008890742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:10,880 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:10,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 15 [2021-05-02 13:04:10,880 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855200141] [2021-05-02 13:04:10,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 13:04:10,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:10,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 13:04:10,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-05-02 13:04:10,882 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 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 13:04:11,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:11,723 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2021-05-02 13:04:11,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 13:04:11,724 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 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 35 [2021-05-02 13:04:11,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:11,724 INFO L225 Difference]: With dead ends: 61 [2021-05-02 13:04:11,724 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 13:04:11,725 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 752.6ms TimeCoverageRelationStatistics Valid=211, Invalid=659, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:04:11,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 13:04:11,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 45. [2021-05-02 13:04:11,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 40 states have (on average 1.075) internal successors, (43), 40 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:11,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-05-02 13:04:11,729 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 35 [2021-05-02 13:04:11,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:11,729 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-05-02 13:04:11,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.8) internal successors, (42), 14 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 13:04:11,730 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-05-02 13:04:11,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 13:04:11,730 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:11,730 INFO L523 BasicCegarLoop]: trace histogram [11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:11,944 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:11,945 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:11,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:11,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1282266636, now seen corresponding path program 4 times [2021-05-02 13:04:11,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:11,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108321555] [2021-05-02 13:04:11,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:11,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:12,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:12,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:12,079 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 48 proven. 126 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:04:12,079 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:12,079 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108321555] [2021-05-02 13:04:12,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2108321555] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:12,079 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722917727] [2021-05-02 13:04:12,079 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:12,117 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:04:12,117 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:12,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 13:04:12,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:12,193 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:12,203 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 48 proven. 126 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:04:12,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [722917727] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:12,203 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:12,203 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 13:04:12,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484004994] [2021-05-02 13:04:12,204 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:04:12,204 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:12,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:04:12,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:04:12,204 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:12,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:12,590 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-05-02 13:04:12,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:04:12,591 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 44 [2021-05-02 13:04:12,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:12,594 INFO L225 Difference]: With dead ends: 62 [2021-05-02 13:04:12,594 INFO L226 Difference]: Without dead ends: 49 [2021-05-02 13:04:12,594 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 316.9ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:04:12,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-05-02 13:04:12,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-05-02 13:04:12,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:12,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2021-05-02 13:04:12,612 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 44 [2021-05-02 13:04:12,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:12,612 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2021-05-02 13:04:12,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 13 states have internal predecessors, (43), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:12,613 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2021-05-02 13:04:12,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 13:04:12,613 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:12,613 INFO L523 BasicCegarLoop]: trace histogram [12, 12, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:12,828 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:12,829 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:12,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:12,829 INFO L82 PathProgramCache]: Analyzing trace with hash 1647154724, now seen corresponding path program 5 times [2021-05-02 13:04:12,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:12,829 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559983540] [2021-05-02 13:04:12,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:12,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:12,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:12,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:12,976 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 53 proven. 155 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:04:12,977 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:12,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559983540] [2021-05-02 13:04:12,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559983540] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:12,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785890560] [2021-05-02 13:04:12,977 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:13,201 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-05-02 13:04:13,201 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:13,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 13:04:13,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:13,367 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 53 proven. 155 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:04:13,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785890560] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:13,367 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:13,367 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 16 [2021-05-02 13:04:13,367 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764291743] [2021-05-02 13:04:13,368 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:04:13,368 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:13,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:04:13,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:04:13,368 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:13,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:13,903 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2021-05-02 13:04:13,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:04:13,903 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 47 [2021-05-02 13:04:13,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:13,904 INFO L225 Difference]: With dead ends: 65 [2021-05-02 13:04:13,904 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 13:04:13,904 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 37 SyntacticMatches, 12 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 476.2ms TimeCoverageRelationStatistics Valid=104, Invalid=652, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:04:13,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 13:04:13,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2021-05-02 13:04:13,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:13,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2021-05-02 13:04:13,909 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 47 [2021-05-02 13:04:13,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:13,911 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2021-05-02 13:04:13,911 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.875) internal successors, (46), 15 states have internal predecessors, (46), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:13,912 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2021-05-02 13:04:13,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:04:13,913 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:13,913 INFO L523 BasicCegarLoop]: trace histogram [13, 13, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:14,114 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 13:04:14,116 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:14,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:14,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1465958156, now seen corresponding path program 6 times [2021-05-02 13:04:14,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:14,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411809336] [2021-05-02 13:04:14,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:14,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:14,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:14,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:14,292 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 58 proven. 187 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:04:14,292 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:14,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411809336] [2021-05-02 13:04:14,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1411809336] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:14,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456850725] [2021-05-02 13:04:14,292 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:14,438 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2021-05-02 13:04:14,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:14,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 13:04:14,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:14,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:14,721 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 85 proven. 7 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2021-05-02 13:04:14,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456850725] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:14,722 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:14,722 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 21 [2021-05-02 13:04:14,722 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968373913] [2021-05-02 13:04:14,722 INFO L460 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-05-02 13:04:14,722 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:14,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-05-02 13:04:14,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2021-05-02 13:04:14,723 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand has 21 states, 21 states have (on average 2.8095238095238093) internal successors, (59), 20 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:15,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:15,964 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2021-05-02 13:04:15,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 13:04:15,964 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.8095238095238093) internal successors, (59), 20 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 50 [2021-05-02 13:04:15,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:15,965 INFO L225 Difference]: With dead ends: 76 [2021-05-02 13:04:15,965 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 13:04:15,966 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 1145.4ms TimeCoverageRelationStatistics Valid=251, Invalid=1309, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:04:15,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 13:04:15,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 61. [2021-05-02 13:04:15,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:15,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-05-02 13:04:15,970 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 50 [2021-05-02 13:04:15,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:15,970 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-05-02 13:04:15,971 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 21 states, 21 states have (on average 2.8095238095238093) internal successors, (59), 20 states have internal predecessors, (59), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:15,971 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-05-02 13:04:15,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 13:04:15,971 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:15,971 INFO L523 BasicCegarLoop]: trace histogram [16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:16,177 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:16,177 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:16,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:16,178 INFO L82 PathProgramCache]: Analyzing trace with hash -1541195998, now seen corresponding path program 7 times [2021-05-02 13:04:16,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:16,178 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857117024] [2021-05-02 13:04:16,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:16,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:16,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:16,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:16,389 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 109 proven. 260 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:04:16,389 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:16,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857117024] [2021-05-02 13:04:16,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857117024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:16,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962053533] [2021-05-02 13:04:16,390 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:16,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:16,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 13:04:16,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:16,567 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:16,592 INFO L134 CoverageAnalysis]: Checked inductivity of 376 backedges. 109 proven. 260 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:04:16,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962053533] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:16,592 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:16,592 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 13:04:16,592 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535897456] [2021-05-02 13:04:16,593 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:04:16,593 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:16,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:04:16,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:04:16,594 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:17,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:17,225 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2021-05-02 13:04:17,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:04:17,225 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 59 [2021-05-02 13:04:17,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:17,226 INFO L225 Difference]: With dead ends: 82 [2021-05-02 13:04:17,226 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 13:04:17,227 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 61 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 458.4ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:04:17,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 13:04:17,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-05-02 13:04:17,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 59 states have (on average 1.0508474576271187) internal successors, (62), 59 states have internal predecessors, (62), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:17,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2021-05-02 13:04:17,231 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 59 [2021-05-02 13:04:17,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:17,232 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2021-05-02 13:04:17,232 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 3.0555555555555554) internal successors, (55), 17 states have internal predecessors, (55), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:17,232 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2021-05-02 13:04:17,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 13:04:17,232 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:17,232 INFO L523 BasicCegarLoop]: trace histogram [17, 17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:17,448 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:17,449 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:17,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:17,449 INFO L82 PathProgramCache]: Analyzing trace with hash 77087754, now seen corresponding path program 8 times [2021-05-02 13:04:17,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:17,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1060688409] [2021-05-02 13:04:17,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:17,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:17,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:17,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:17,662 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 117 proven. 301 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:04:17,662 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:17,662 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1060688409] [2021-05-02 13:04:17,663 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1060688409] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:17,663 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [564820880] [2021-05-02 13:04:17,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:17,715 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:04:17,716 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:17,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 13:04:17,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:17,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:17,819 INFO L134 CoverageAnalysis]: Checked inductivity of 425 backedges. 117 proven. 301 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:04:17,820 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [564820880] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:17,820 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:17,820 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 13:04:17,820 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593916529] [2021-05-02 13:04:17,820 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:04:17,820 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:17,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:04:17,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:04:17,821 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:18,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:18,496 INFO L93 Difference]: Finished difference Result 85 states and 90 transitions. [2021-05-02 13:04:18,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 13:04:18,496 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 62 [2021-05-02 13:04:18,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:18,497 INFO L225 Difference]: With dead ends: 85 [2021-05-02 13:04:18,497 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 13:04:18,497 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 64 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 515.6ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:04:18,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 13:04:18,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2021-05-02 13:04:18,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:18,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 69 transitions. [2021-05-02 13:04:18,502 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 69 transitions. Word has length 62 [2021-05-02 13:04:18,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:18,502 INFO L480 AbstractCegarLoop]: Abstraction has 67 states and 69 transitions. [2021-05-02 13:04:18,502 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 18 states have internal predecessors, (58), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:18,502 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 69 transitions. [2021-05-02 13:04:18,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-02 13:04:18,503 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:18,503 INFO L523 BasicCegarLoop]: trace histogram [18, 18, 15, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:18,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 13:04:18,717 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:18,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:18,717 INFO L82 PathProgramCache]: Analyzing trace with hash -639554014, now seen corresponding path program 9 times [2021-05-02 13:04:18,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:18,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378502495] [2021-05-02 13:04:18,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:18,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:18,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:18,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:18,930 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 125 proven. 345 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-02 13:04:18,931 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:18,931 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1378502495] [2021-05-02 13:04:18,931 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1378502495] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:18,931 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474185607] [2021-05-02 13:04:18,931 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:19,070 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-05-02 13:04:19,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:19,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 13:04:19,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:19,123 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:19,540 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:19,547 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 161 proven. 15 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2021-05-02 13:04:19,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474185607] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:19,547 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:19,547 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 9] total 26 [2021-05-02 13:04:19,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967812100] [2021-05-02 13:04:19,547 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:04:19,548 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:19,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:04:19,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:04:19,548 INFO L87 Difference]: Start difference. First operand 67 states and 69 transitions. Second operand has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 25 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:21,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:21,365 INFO L93 Difference]: Finished difference Result 95 states and 103 transitions. [2021-05-02 13:04:21,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:04:21,365 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 25 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 65 [2021-05-02 13:04:21,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:21,366 INFO L225 Difference]: With dead ends: 95 [2021-05-02 13:04:21,366 INFO L226 Difference]: Without dead ends: 78 [2021-05-02 13:04:21,367 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 57 SyntacticMatches, 5 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 1681.8ms TimeCoverageRelationStatistics Valid=324, Invalid=2126, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 13:04:21,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-05-02 13:04:21,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2021-05-02 13:04:21,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 71 states have (on average 1.0422535211267605) internal successors, (74), 71 states have internal predecessors, (74), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:21,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2021-05-02 13:04:21,371 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 65 [2021-05-02 13:04:21,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:21,371 INFO L480 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2021-05-02 13:04:21,371 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 25 states have internal predecessors, (74), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:21,371 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2021-05-02 13:04:21,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-02 13:04:21,372 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:21,372 INFO L523 BasicCegarLoop]: trace histogram [21, 21, 17, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:21,575 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 13:04:21,575 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:21,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:21,575 INFO L82 PathProgramCache]: Analyzing trace with hash 300358220, now seen corresponding path program 10 times [2021-05-02 13:04:21,575 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:21,576 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150226402] [2021-05-02 13:04:21,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:21,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:21,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:21,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:21,865 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 194 proven. 442 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:04:21,865 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:21,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150226402] [2021-05-02 13:04:21,865 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150226402] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:21,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689636478] [2021-05-02 13:04:21,865 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:21,908 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:04:21,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:21,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 41 conjunts are in the unsatisfiable core [2021-05-02 13:04:21,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:22,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:22,096 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 98 proven. 551 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:04:22,097 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1689636478] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:22,097 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:22,097 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 22] total 24 [2021-05-02 13:04:22,097 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562608686] [2021-05-02 13:04:22,097 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 13:04:22,097 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:22,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 13:04:22,098 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=489, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:04:22,098 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:23,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:23,165 INFO L93 Difference]: Finished difference Result 106 states and 113 transitions. [2021-05-02 13:04:23,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 13:04:23,166 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 74 [2021-05-02 13:04:23,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:23,166 INFO L225 Difference]: With dead ends: 106 [2021-05-02 13:04:23,166 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 13:04:23,167 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 809.4ms TimeCoverageRelationStatistics Valid=161, Invalid=1731, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 13:04:23,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 13:04:23,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-02 13:04:23,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:23,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-05-02 13:04:23,171 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 74 [2021-05-02 13:04:23,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:23,172 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-05-02 13:04:23,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 3.0416666666666665) internal successors, (73), 23 states have internal predecessors, (73), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:23,172 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-05-02 13:04:23,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 13:04:23,172 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:23,172 INFO L523 BasicCegarLoop]: trace histogram [24, 24, 20, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:23,385 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 13:04:23,385 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:23,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:23,386 INFO L82 PathProgramCache]: Analyzing trace with hash -533211292, now seen corresponding path program 11 times [2021-05-02 13:04:23,386 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:23,386 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172755531] [2021-05-02 13:04:23,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:23,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:23,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:23,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:23,703 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 227 proven. 610 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:04:23,704 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:23,704 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172755531] [2021-05-02 13:04:23,704 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [172755531] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:23,704 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577691724] [2021-05-02 13:04:23,704 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:30,675 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 25 check-sat command(s) [2021-05-02 13:04:30,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:30,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 58 conjunts are in the unsatisfiable core [2021-05-02 13:04:30,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:30,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:31,000 INFO L134 CoverageAnalysis]: Checked inductivity of 852 backedges. 113 proven. 737 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 13:04:31,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1577691724] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:31,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:31,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25] total 27 [2021-05-02 13:04:31,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442949185] [2021-05-02 13:04:31,001 INFO L460 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-05-02 13:04:31,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:31,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-05-02 13:04:31,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=630, Unknown=0, NotChecked=0, Total=702 [2021-05-02 13:04:31,002 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 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 13:04:32,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:32,227 INFO L93 Difference]: Finished difference Result 115 states and 122 transitions. [2021-05-02 13:04:32,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:04:32,227 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 states have internal predecessors, (82), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 83 [2021-05-02 13:04:32,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:32,228 INFO L225 Difference]: With dead ends: 115 [2021-05-02 13:04:32,228 INFO L226 Difference]: Without dead ends: 95 [2021-05-02 13:04:32,229 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 72 SyntacticMatches, 12 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 1022.0ms TimeCoverageRelationStatistics Valid=185, Invalid=2265, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 13:04:32,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-02 13:04:32,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2021-05-02 13:04:32,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 89 states have (on average 1.0337078651685394) internal successors, (92), 89 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 13:04:32,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2021-05-02 13:04:32,233 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 83 [2021-05-02 13:04:32,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:32,233 INFO L480 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2021-05-02 13:04:32,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 27 states, 27 states have (on average 3.037037037037037) internal successors, (82), 26 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 13:04:32,234 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2021-05-02 13:04:32,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 13:04:32,234 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:32,234 INFO L523 BasicCegarLoop]: trace histogram [27, 27, 23, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:32,439 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:32,439 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:32,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:32,439 INFO L82 PathProgramCache]: Analyzing trace with hash 1263424844, now seen corresponding path program 12 times [2021-05-02 13:04:32,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:32,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [967974191] [2021-05-02 13:04:32,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:32,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:32,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:32,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:32,858 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 260 proven. 805 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:04:32,859 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:32,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [967974191] [2021-05-02 13:04:32,859 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [967974191] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:32,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982127302] [2021-05-02 13:04:32,859 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:33,077 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 15 check-sat command(s) [2021-05-02 13:04:33,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:33,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 13:04:33,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:33,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:33,635 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:33,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:33,834 INFO L134 CoverageAnalysis]: Checked inductivity of 1080 backedges. 392 proven. 243 refuted. 0 times theorem prover too weak. 445 trivial. 0 not checked. [2021-05-02 13:04:33,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982127302] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:33,834 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:33,834 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 17] total 42 [2021-05-02 13:04:33,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031734285] [2021-05-02 13:04:33,834 INFO L460 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-05-02 13:04:33,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:33,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-05-02 13:04:33,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1558, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:04:33,835 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand has 42 states, 42 states have (on average 2.7142857142857144) internal successors, (114), 41 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 13:04:37,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:37,378 INFO L93 Difference]: Finished difference Result 137 states and 149 transitions. [2021-05-02 13:04:37,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2021-05-02 13:04:37,378 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.7142857142857144) internal successors, (114), 41 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 92 [2021-05-02 13:04:37,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:37,380 INFO L225 Difference]: With dead ends: 137 [2021-05-02 13:04:37,380 INFO L226 Difference]: Without dead ends: 117 [2021-05-02 13:04:37,382 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 927 ImplicationChecksByTransitivity, 3641.0ms TimeCoverageRelationStatistics Valid=1169, Invalid=5473, Unknown=0, NotChecked=0, Total=6642 [2021-05-02 13:04:37,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-05-02 13:04:37,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 102. [2021-05-02 13:04:37,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 97 states have internal predecessors, (100), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:37,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 104 transitions. [2021-05-02 13:04:37,388 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 104 transitions. Word has length 92 [2021-05-02 13:04:37,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:37,388 INFO L480 AbstractCegarLoop]: Abstraction has 102 states and 104 transitions. [2021-05-02 13:04:37,388 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 42 states, 42 states have (on average 2.7142857142857144) internal successors, (114), 41 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 13:04:37,388 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 104 transitions. [2021-05-02 13:04:37,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 13:04:37,389 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:37,389 INFO L523 BasicCegarLoop]: trace histogram [30, 30, 25, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:37,592 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 13:04:37,592 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:37,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:37,592 INFO L82 PathProgramCache]: Analyzing trace with hash -1670498078, now seen corresponding path program 13 times [2021-05-02 13:04:37,592 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:37,592 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448915521] [2021-05-02 13:04:37,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:37,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:38,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:38,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:38,094 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 359 proven. 950 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 13:04:38,094 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:38,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448915521] [2021-05-02 13:04:38,094 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448915521] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:38,094 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845668217] [2021-05-02 13:04:38,094 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:38,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:38,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 13:04:38,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:38,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:38,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1335 backedges. 359 proven. 950 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 13:04:38,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [845668217] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:38,313 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:38,313 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 13:04:38,313 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067835482] [2021-05-02 13:04:38,313 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 13:04:38,314 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:38,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 13:04:38,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:04:38,314 INFO L87 Difference]: Start difference. First operand 102 states and 104 transitions. Second operand has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:39,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:39,843 INFO L93 Difference]: Finished difference Result 128 states and 133 transitions. [2021-05-02 13:04:39,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 13:04:39,844 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 101 [2021-05-02 13:04:39,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:39,844 INFO L225 Difference]: With dead ends: 128 [2021-05-02 13:04:39,844 INFO L226 Difference]: Without dead ends: 106 [2021-05-02 13:04:39,845 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 103 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1163.2ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:04:39,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2021-05-02 13:04:39,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2021-05-02 13:04:39,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 100 states have (on average 1.03) internal successors, (103), 100 states have internal predecessors, (103), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:39,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2021-05-02 13:04:39,850 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 101 [2021-05-02 13:04:39,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:39,850 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2021-05-02 13:04:39,850 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 3.033333333333333) internal successors, (91), 29 states have internal predecessors, (91), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:39,850 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2021-05-02 13:04:39,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-05-02 13:04:39,851 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:39,851 INFO L523 BasicCegarLoop]: trace histogram [31, 31, 26, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:40,064 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 13:04:40,065 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:40,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:40,065 INFO L82 PathProgramCache]: Analyzing trace with hash 1864410058, now seen corresponding path program 14 times [2021-05-02 13:04:40,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:40,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714209838] [2021-05-02 13:04:40,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:40,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:40,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:40,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:40,589 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 373 proven. 1027 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 13:04:40,589 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:40,589 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714209838] [2021-05-02 13:04:40,590 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [714209838] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:40,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [877122569] [2021-05-02 13:04:40,590 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:40,640 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:04:40,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:40,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 13:04:40,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:40,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:40,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1426 backedges. 373 proven. 1027 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 13:04:40,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [877122569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:40,811 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:40,811 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 13:04:40,811 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615315367] [2021-05-02 13:04:40,812 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:04:40,812 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:40,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:04:40,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:04:40,812 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:42,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:42,416 INFO L93 Difference]: Finished difference Result 131 states and 136 transitions. [2021-05-02 13:04:42,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:04:42,417 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 104 [2021-05-02 13:04:42,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:42,418 INFO L225 Difference]: With dead ends: 131 [2021-05-02 13:04:42,418 INFO L226 Difference]: Without dead ends: 109 [2021-05-02 13:04:42,419 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 106 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1227.3ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:04:42,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2021-05-02 13:04:42,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2021-05-02 13:04:42,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 103 states have (on average 1.029126213592233) internal successors, (106), 103 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 13:04:42,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2021-05-02 13:04:42,424 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 104 [2021-05-02 13:04:42,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:42,424 INFO L480 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2021-05-02 13:04:42,424 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 3.032258064516129) internal successors, (94), 30 states have internal predecessors, (94), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:42,425 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2021-05-02 13:04:42,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 13:04:42,425 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:42,425 INFO L523 BasicCegarLoop]: trace histogram [32, 32, 27, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:42,628 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:42,629 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:42,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:42,629 INFO L82 PathProgramCache]: Analyzing trace with hash 2009559010, now seen corresponding path program 15 times [2021-05-02 13:04:42,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:42,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581626255] [2021-05-02 13:04:42,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:42,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:43,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:43,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:43,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 387 proven. 1107 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 13:04:43,169 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:43,170 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581626255] [2021-05-02 13:04:43,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1581626255] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:43,170 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672247747] [2021-05-02 13:04:43,170 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:43,308 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 13:04:43,308 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:43,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:04:43,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:43,895 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:43,902 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 453 proven. 40 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2021-05-02 13:04:43,902 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [672247747] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:43,902 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:43,903 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 11] total 40 [2021-05-02 13:04:43,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [951327538] [2021-05-02 13:04:43,903 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 13:04:43,903 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:43,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 13:04:43,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:04:43,904 INFO L87 Difference]: Start difference. First operand 108 states and 110 transitions. Second operand has 40 states, 40 states have (on average 2.9) internal successors, (116), 39 states have internal predecessors, (116), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:47,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:47,997 INFO L93 Difference]: Finished difference Result 142 states and 151 transitions. [2021-05-02 13:04:47,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-05-02 13:04:47,997 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.9) internal successors, (116), 39 states have internal predecessors, (116), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 107 [2021-05-02 13:04:47,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:47,998 INFO L225 Difference]: With dead ends: 142 [2021-05-02 13:04:47,998 INFO L226 Difference]: Without dead ends: 120 [2021-05-02 13:04:47,999 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 725 ImplicationChecksByTransitivity, 3253.3ms TimeCoverageRelationStatistics Valid=534, Invalid=5472, Unknown=0, NotChecked=0, Total=6006 [2021-05-02 13:04:47,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-02 13:04:48,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2021-05-02 13:04:48,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 113 states have (on average 1.0265486725663717) internal successors, (116), 113 states have internal predecessors, (116), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:48,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2021-05-02 13:04:48,005 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 107 [2021-05-02 13:04:48,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:48,005 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2021-05-02 13:04:48,005 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 2.9) internal successors, (116), 39 states have internal predecessors, (116), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:48,005 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2021-05-02 13:04:48,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-02 13:04:48,006 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:48,006 INFO L523 BasicCegarLoop]: trace histogram [35, 35, 29, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:48,206 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:48,206 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:48,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:48,207 INFO L82 PathProgramCache]: Analyzing trace with hash -718192500, now seen corresponding path program 16 times [2021-05-02 13:04:48,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:48,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627171521] [2021-05-02 13:04:48,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:48,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:48,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:48,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:48,793 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 504 proven. 1276 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:04:48,793 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:48,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627171521] [2021-05-02 13:04:48,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1627171521] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:48,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317850715] [2021-05-02 13:04:48,793 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:48,853 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:04:48,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:04:48,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 61 conjunts are in the unsatisfiable core [2021-05-02 13:04:48,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:04:49,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:04:49,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1820 backedges. 504 proven. 1276 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:04:49,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317850715] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:49,047 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:04:49,047 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 13:04:49,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275902474] [2021-05-02 13:04:49,050 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:04:49,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:04:49,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:04:49,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:04:49,051 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:51,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:04:51,118 INFO L93 Difference]: Finished difference Result 148 states and 153 transitions. [2021-05-02 13:04:51,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 13:04:51,118 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 116 [2021-05-02 13:04:51,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:04:51,119 INFO L225 Difference]: With dead ends: 148 [2021-05-02 13:04:51,119 INFO L226 Difference]: Without dead ends: 122 [2021-05-02 13:04:51,120 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 118 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 1451.2ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 13:04:51,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-05-02 13:04:51,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2021-05-02 13:04:51,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:51,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2021-05-02 13:04:51,125 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 116 [2021-05-02 13:04:51,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:04:51,125 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2021-05-02 13:04:51,125 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 3.0294117647058822) internal successors, (103), 33 states have internal predecessors, (103), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:04:51,125 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2021-05-02 13:04:51,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-05-02 13:04:51,126 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:04:51,126 INFO L523 BasicCegarLoop]: trace histogram [36, 36, 30, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:04:51,343 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:04:51,343 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:04:51,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:04:51,343 INFO L82 PathProgramCache]: Analyzing trace with hash -632379228, now seen corresponding path program 17 times [2021-05-02 13:04:51,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:04:51,344 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598515100] [2021-05-02 13:04:51,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:04:51,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:51,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:04:51,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:04:51,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 521 proven. 1365 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:04:51,965 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:04:51,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598515100] [2021-05-02 13:04:51,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1598515100] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:04:51,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768890941] [2021-05-02 13:04:51,965 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:12,372 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 37 check-sat command(s) [2021-05-02 13:05:12,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:12,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 96 conjunts are in the unsatisfiable core [2021-05-02 13:05:12,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:13,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:13,059 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 521 proven. 1365 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:05:13,059 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [768890941] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:13,059 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:13,059 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 13:05:13,060 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102553832] [2021-05-02 13:05:13,060 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:05:13,060 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:13,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:05:13,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:05:13,061 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:15,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:15,290 INFO L93 Difference]: Finished difference Result 151 states and 156 transitions. [2021-05-02 13:05:15,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 13:05:15,293 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 119 [2021-05-02 13:05:15,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:15,293 INFO L225 Difference]: With dead ends: 151 [2021-05-02 13:05:15,293 INFO L226 Difference]: Without dead ends: 125 [2021-05-02 13:05:15,294 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 92 SyntacticMatches, 30 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 524 ImplicationChecksByTransitivity, 2026.2ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:05:15,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2021-05-02 13:05:15,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 124. [2021-05-02 13:05:15,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 119 states have (on average 1.0252100840336134) internal successors, (122), 119 states have internal predecessors, (122), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:15,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2021-05-02 13:05:15,301 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 119 [2021-05-02 13:05:15,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:15,301 INFO L480 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2021-05-02 13:05:15,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 3.0285714285714285) internal successors, (106), 34 states have internal predecessors, (106), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:15,301 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2021-05-02 13:05:15,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-02 13:05:15,305 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:15,305 INFO L523 BasicCegarLoop]: trace histogram [37, 37, 31, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:15,505 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 13:05:15,506 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:15,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:15,506 INFO L82 PathProgramCache]: Analyzing trace with hash 325265804, now seen corresponding path program 18 times [2021-05-02 13:05:15,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:15,506 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266452094] [2021-05-02 13:05:15,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:15,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:16,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:16,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:16,167 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 538 proven. 1457 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 13:05:16,167 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:16,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266452094] [2021-05-02 13:05:16,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266452094] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:16,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389365562] [2021-05-02 13:05:16,167 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:17,026 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 21 check-sat command(s) [2021-05-02 13:05:17,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:17,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:05:17,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:17,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:17,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:18,003 INFO L134 CoverageAnalysis]: Checked inductivity of 2035 backedges. 613 proven. 57 refuted. 0 times theorem prover too weak. 1365 trivial. 0 not checked. [2021-05-02 13:05:18,004 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1389365562] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:18,004 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:18,004 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 12] total 45 [2021-05-02 13:05:18,004 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949351049] [2021-05-02 13:05:18,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 45 states [2021-05-02 13:05:18,004 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:18,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-05-02 13:05:18,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1852, Unknown=0, NotChecked=0, Total=1980 [2021-05-02 13:05:18,005 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 44 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:23,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:23,242 INFO L93 Difference]: Finished difference Result 161 states and 169 transitions. [2021-05-02 13:05:23,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 13:05:23,242 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 44 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 122 [2021-05-02 13:05:23,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:23,243 INFO L225 Difference]: With dead ends: 161 [2021-05-02 13:05:23,243 INFO L226 Difference]: Without dead ends: 135 [2021-05-02 13:05:23,245 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 113 SyntacticMatches, 3 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 933 ImplicationChecksByTransitivity, 4354.6ms TimeCoverageRelationStatistics Valid=607, Invalid=7049, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 13:05:23,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-05-02 13:05:23,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 133. [2021-05-02 13:05:23,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:23,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-05-02 13:05:23,251 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 122 [2021-05-02 13:05:23,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:23,251 INFO L480 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-05-02 13:05:23,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 45 states, 45 states have (on average 2.911111111111111) internal successors, (131), 44 states have internal predecessors, (131), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:23,252 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-05-02 13:05:23,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-05-02 13:05:23,252 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:23,252 INFO L523 BasicCegarLoop]: trace histogram [40, 40, 33, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:23,453 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 13:05:23,453 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:23,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:23,453 INFO L82 PathProgramCache]: Analyzing trace with hash -2064925534, now seen corresponding path program 19 times [2021-05-02 13:05:23,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:23,454 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [361720514] [2021-05-02 13:05:23,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:23,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:24,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:24,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:24,204 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 673 proven. 1650 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:05:24,204 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:24,204 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [361720514] [2021-05-02 13:05:24,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [361720514] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:24,205 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511533806] [2021-05-02 13:05:24,205 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:24,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:24,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 69 conjunts are in the unsatisfiable core [2021-05-02 13:05:24,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:24,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:24,496 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 673 proven. 1650 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:05:24,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1511533806] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:24,496 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:24,496 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36] total 38 [2021-05-02 13:05:24,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144644005] [2021-05-02 13:05:24,497 INFO L460 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-05-02 13:05:24,497 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:24,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-05-02 13:05:24,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2021-05-02 13:05:24,498 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:27,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:27,195 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2021-05-02 13:05:27,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2021-05-02 13:05:27,196 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 131 [2021-05-02 13:05:27,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:27,196 INFO L225 Difference]: With dead ends: 166 [2021-05-02 13:05:27,196 INFO L226 Difference]: Without dead ends: 137 [2021-05-02 13:05:27,199 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 565 ImplicationChecksByTransitivity, 1867.4ms TimeCoverageRelationStatistics Valid=277, Invalid=4835, Unknown=0, NotChecked=0, Total=5112 [2021-05-02 13:05:27,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-05-02 13:05:27,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 136. [2021-05-02 13:05:27,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 131 states have (on average 1.0229007633587786) internal successors, (134), 131 states have internal predecessors, (134), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:27,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2021-05-02 13:05:27,206 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 131 [2021-05-02 13:05:27,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:27,206 INFO L480 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2021-05-02 13:05:27,206 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 38 states, 38 states have (on average 3.026315789473684) internal successors, (115), 37 states have internal predecessors, (115), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:27,206 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2021-05-02 13:05:27,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 135 [2021-05-02 13:05:27,207 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:27,207 INFO L523 BasicCegarLoop]: trace histogram [41, 41, 34, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:27,412 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:27,413 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:27,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:27,413 INFO L82 PathProgramCache]: Analyzing trace with hash 1778262410, now seen corresponding path program 20 times [2021-05-02 13:05:27,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:27,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803369831] [2021-05-02 13:05:27,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:27,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:28,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:28,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:28,221 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 693 proven. 1751 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:05:28,222 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:28,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803369831] [2021-05-02 13:05:28,222 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803369831] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:28,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359236188] [2021-05-02 13:05:28,222 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:28,280 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:05:28,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:28,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 71 conjunts are in the unsatisfiable core [2021-05-02 13:05:28,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:28,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:28,512 INFO L134 CoverageAnalysis]: Checked inductivity of 2501 backedges. 693 proven. 1751 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:05:28,512 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [359236188] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:28,512 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:28,512 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2021-05-02 13:05:28,512 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860314439] [2021-05-02 13:05:28,513 INFO L460 AbstractCegarLoop]: Interpolant automaton has 39 states [2021-05-02 13:05:28,513 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:28,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-05-02 13:05:28,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2021-05-02 13:05:28,513 INFO L87 Difference]: Start difference. First operand 136 states and 138 transitions. Second operand has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:31,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:31,387 INFO L93 Difference]: Finished difference Result 169 states and 174 transitions. [2021-05-02 13:05:31,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-02 13:05:31,388 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 134 [2021-05-02 13:05:31,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:31,389 INFO L225 Difference]: With dead ends: 169 [2021-05-02 13:05:31,389 INFO L226 Difference]: Without dead ends: 140 [2021-05-02 13:05:31,389 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 599 ImplicationChecksByTransitivity, 2014.0ms TimeCoverageRelationStatistics Valid=285, Invalid=5117, Unknown=0, NotChecked=0, Total=5402 [2021-05-02 13:05:31,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2021-05-02 13:05:31,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 139. [2021-05-02 13:05:31,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139 states, 134 states have (on average 1.0223880597014925) internal successors, (137), 134 states have internal predecessors, (137), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:31,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 141 transitions. [2021-05-02 13:05:31,396 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 141 transitions. Word has length 134 [2021-05-02 13:05:31,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:31,396 INFO L480 AbstractCegarLoop]: Abstraction has 139 states and 141 transitions. [2021-05-02 13:05:31,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 39 states, 39 states have (on average 3.0256410256410255) internal successors, (118), 38 states have internal predecessors, (118), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:31,396 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 141 transitions. [2021-05-02 13:05:31,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-05-02 13:05:31,397 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:31,397 INFO L523 BasicCegarLoop]: trace histogram [42, 42, 35, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:31,597 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 13:05:31,598 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:31,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:31,598 INFO L82 PathProgramCache]: Analyzing trace with hash -1047874654, now seen corresponding path program 21 times [2021-05-02 13:05:31,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:31,598 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104572662] [2021-05-02 13:05:31,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:31,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:32,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:32,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:32,371 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 713 proven. 1855 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-05-02 13:05:32,371 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:32,372 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104572662] [2021-05-02 13:05:32,372 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104572662] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:32,372 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [241782426] [2021-05-02 13:05:32,372 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:32,572 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-05-02 13:05:32,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:32,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 13:05:32,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:34,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:34,129 INFO L134 CoverageAnalysis]: Checked inductivity of 2625 backedges. 713 proven. 517 refuted. 0 times theorem prover too weak. 1395 trivial. 0 not checked. [2021-05-02 13:05:34,129 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [241782426] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:34,129 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:34,129 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 17] total 54 [2021-05-02 13:05:34,129 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942933043] [2021-05-02 13:05:34,130 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 13:05:34,130 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:34,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 13:05:34,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=2690, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 13:05:34,131 INFO L87 Difference]: Start difference. First operand 139 states and 141 transitions. Second operand has 54 states, 54 states have (on average 2.9074074074074074) internal successors, (157), 53 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:42,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:42,497 INFO L93 Difference]: Finished difference Result 182 states and 191 transitions. [2021-05-02 13:05:42,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 13:05:42,498 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 2.9074074074074074) internal successors, (157), 53 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 137 [2021-05-02 13:05:42,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:42,499 INFO L225 Difference]: With dead ends: 182 [2021-05-02 13:05:42,499 INFO L226 Difference]: Without dead ends: 153 [2021-05-02 13:05:42,500 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 121 SyntacticMatches, 5 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1580 ImplicationChecksByTransitivity, 7048.2ms TimeCoverageRelationStatistics Valid=844, Invalid=9868, Unknown=0, NotChecked=0, Total=10712 [2021-05-02 13:05:42,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2021-05-02 13:05:42,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 148. [2021-05-02 13:05:42,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 143 states have (on average 1.020979020979021) internal successors, (146), 143 states have internal predecessors, (146), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:42,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2021-05-02 13:05:42,507 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 137 [2021-05-02 13:05:42,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:42,507 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2021-05-02 13:05:42,507 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 2.9074074074074074) internal successors, (157), 53 states have internal predecessors, (157), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:42,507 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2021-05-02 13:05:42,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-05-02 13:05:42,508 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:42,508 INFO L523 BasicCegarLoop]: trace histogram [45, 45, 37, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:42,712 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:42,712 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:42,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:42,713 INFO L82 PathProgramCache]: Analyzing trace with hash 9217228, now seen corresponding path program 22 times [2021-05-02 13:05:42,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:42,713 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014351650] [2021-05-02 13:05:42,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:42,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:43,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:43,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:43,679 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 866 proven. 2072 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:05:43,679 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:43,679 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014351650] [2021-05-02 13:05:43,680 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014351650] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:43,680 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1710493322] [2021-05-02 13:05:43,680 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:05:43,748 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:05:43,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:05:43,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 85 conjunts are in the unsatisfiable core [2021-05-02 13:05:43,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:05:44,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:05:44,184 INFO L134 CoverageAnalysis]: Checked inductivity of 3015 backedges. 458 proven. 2542 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:05:44,184 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1710493322] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:44,184 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:05:44,184 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 44] total 46 [2021-05-02 13:05:44,184 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145228118] [2021-05-02 13:05:44,185 INFO L460 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-05-02 13:05:44,185 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:05:44,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-05-02 13:05:44,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=1943, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 13:05:44,185 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:48,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:05:48,497 INFO L93 Difference]: Finished difference Result 196 states and 205 transitions. [2021-05-02 13:05:48,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-05-02 13:05:48,499 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 146 [2021-05-02 13:05:48,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:05:48,500 INFO L225 Difference]: With dead ends: 196 [2021-05-02 13:05:48,500 INFO L226 Difference]: Without dead ends: 164 [2021-05-02 13:05:48,501 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 144 SyntacticMatches, 1 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 877 ImplicationChecksByTransitivity, 2848.5ms TimeCoverageRelationStatistics Valid=333, Invalid=7323, Unknown=0, NotChecked=0, Total=7656 [2021-05-02 13:05:48,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-05-02 13:05:48,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 163. [2021-05-02 13:05:48,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 158 states have (on average 1.018987341772152) internal successors, (161), 158 states have internal predecessors, (161), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:48,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 165 transitions. [2021-05-02 13:05:48,509 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 165 transitions. Word has length 146 [2021-05-02 13:05:48,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:05:48,509 INFO L480 AbstractCegarLoop]: Abstraction has 163 states and 165 transitions. [2021-05-02 13:05:48,509 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:05:48,509 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 165 transitions. [2021-05-02 13:05:48,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-05-02 13:05:48,510 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:05:48,510 INFO L523 BasicCegarLoop]: trace histogram [50, 50, 42, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:05:48,721 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 13:05:48,721 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:05:48,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:05:48,721 INFO L82 PathProgramCache]: Analyzing trace with hash -831520540, now seen corresponding path program 23 times [2021-05-02 13:05:48,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:05:48,721 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682701815] [2021-05-02 13:05:48,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:05:48,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:49,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:05:49,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:05:49,904 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 981 proven. 2667 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:05:49,904 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:05:49,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682701815] [2021-05-02 13:05:49,904 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682701815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:05:49,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1907028404] [2021-05-02 13:05:49,905 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:13:52,972 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 51 check-sat command(s) [2021-05-02 13:13:52,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:13:53,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 137 conjunts are in the unsatisfiable core [2021-05-02 13:13:53,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:13:54,686 INFO L134 CoverageAnalysis]: Checked inductivity of 3725 backedges. 981 proven. 2667 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:13:54,687 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1907028404] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:13:54,687 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:13:54,687 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 45] total 47 [2021-05-02 13:13:54,687 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492994421] [2021-05-02 13:13:54,688 INFO L460 AbstractCegarLoop]: Interpolant automaton has 47 states [2021-05-02 13:13:54,688 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:13:54,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2021-05-02 13:13:54,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=2028, Unknown=0, NotChecked=0, Total=2162 [2021-05-02 13:13:54,689 INFO L87 Difference]: Start difference. First operand 163 states and 165 transitions. Second operand has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:13:59,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:13:59,829 INFO L93 Difference]: Finished difference Result 199 states and 204 transitions. [2021-05-02 13:13:59,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-05-02 13:13:59,831 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 161 [2021-05-02 13:13:59,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:13:59,832 INFO L225 Difference]: With dead ends: 199 [2021-05-02 13:13:59,832 INFO L226 Difference]: Without dead ends: 167 [2021-05-02 13:13:59,833 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 121 SyntacticMatches, 43 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 989 ImplicationChecksByTransitivity, 4550.6ms TimeCoverageRelationStatistics Valid=349, Invalid=7661, Unknown=0, NotChecked=0, Total=8010 [2021-05-02 13:13:59,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-02 13:13:59,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2021-05-02 13:13:59,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 161 states have (on average 1.0186335403726707) internal successors, (164), 161 states have internal predecessors, (164), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:13:59,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 168 transitions. [2021-05-02 13:13:59,845 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 168 transitions. Word has length 161 [2021-05-02 13:13:59,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:13:59,845 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 168 transitions. [2021-05-02 13:13:59,846 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 47 states, 47 states have (on average 3.021276595744681) internal successors, (142), 46 states have internal predecessors, (142), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:13:59,846 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 168 transitions. [2021-05-02 13:13:59,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-05-02 13:13:59,847 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:13:59,847 INFO L523 BasicCegarLoop]: trace histogram [51, 51, 43, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:14:00,057 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 13:14:00,057 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:14:00,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:14:00,058 INFO L82 PathProgramCache]: Analyzing trace with hash -382672948, now seen corresponding path program 24 times [2021-05-02 13:14:00,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:14:00,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [646442856] [2021-05-02 13:14:00,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:14:00,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:14:01,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:14:01,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:14:01,551 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1004 proven. 2795 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:14:01,552 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:14:01,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [646442856] [2021-05-02 13:14:01,552 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [646442856] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:14:01,552 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460171893] [2021-05-02 13:14:01,552 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:14:03,202 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 27 check-sat command(s) [2021-05-02 13:14:03,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:14:03,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:14:03,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:14:04,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:14:04,257 INFO L134 CoverageAnalysis]: Checked inductivity of 3876 backedges. 1109 proven. 100 refuted. 0 times theorem prover too weak. 2667 trivial. 0 not checked. [2021-05-02 13:14:04,257 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460171893] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:14:04,258 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:14:04,258 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 13] total 58 [2021-05-02 13:14:04,258 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118863542] [2021-05-02 13:14:04,258 INFO L460 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-05-02 13:14:04,258 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:14:04,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-05-02 13:14:04,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=3140, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:14:04,260 INFO L87 Difference]: Start difference. First operand 166 states and 168 transitions. Second operand has 58 states, 58 states have (on average 2.9827586206896552) internal successors, (173), 57 states have internal predecessors, (173), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:14:17,057 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 38 [2021-05-02 13:14:18,602 WARN L205 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 38 [2021-05-02 13:14:20,183 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 48 [2021-05-02 13:14:21,145 WARN L205 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 43 [2021-05-02 13:14:22,268 WARN L205 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 45 [2021-05-02 13:14:23,283 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2021-05-02 13:14:24,088 WARN L205 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 45 [2021-05-02 13:14:24,672 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2021-05-02 13:14:25,194 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 45 [2021-05-02 13:14:28,446 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 43 [2021-05-02 13:14:29,316 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 43 [2021-05-02 13:14:29,780 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 45 [2021-05-02 13:14:30,414 WARN L205 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 43 [2021-05-02 13:14:31,043 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2021-05-02 13:14:31,697 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 43 [2021-05-02 13:14:32,391 WARN L205 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 45 [2021-05-02 13:14:33,166 WARN L205 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 43 [2021-05-02 13:14:33,916 WARN L205 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2021-05-02 13:14:35,087 WARN L205 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 43 [2021-05-02 13:14:35,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:14:35,089 INFO L93 Difference]: Finished difference Result 233 states and 249 transitions. [2021-05-02 13:14:35,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2021-05-02 13:14:35,090 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 2.9827586206896552) internal successors, (173), 57 states have internal predecessors, (173), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 164 [2021-05-02 13:14:35,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:14:35,091 INFO L225 Difference]: With dead ends: 233 [2021-05-02 13:14:35,091 INFO L226 Difference]: Without dead ends: 201 [2021-05-02 13:14:35,093 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2451 ImplicationChecksByTransitivity, 29188.6ms TimeCoverageRelationStatistics Valid=2373, Invalid=14397, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 13:14:35,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-05-02 13:14:35,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 174. [2021-05-02 13:14:35,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 169 states have (on average 1.017751479289941) internal successors, (172), 169 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 13:14:35,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 176 transitions. [2021-05-02 13:14:35,105 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 176 transitions. Word has length 164 [2021-05-02 13:14:35,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:14:35,106 INFO L480 AbstractCegarLoop]: Abstraction has 174 states and 176 transitions. [2021-05-02 13:14:35,106 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 58 states, 58 states have (on average 2.9827586206896552) internal successors, (173), 57 states have internal predecessors, (173), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:14:35,106 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 176 transitions. [2021-05-02 13:14:35,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-05-02 13:14:35,107 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:14:35,107 INFO L523 BasicCegarLoop]: trace histogram [54, 54, 45, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:14:35,317 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 13:14:35,317 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:14:35,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:14:35,318 INFO L82 PathProgramCache]: Analyzing trace with hash -995975582, now seen corresponding path program 25 times [2021-05-02 13:14:35,318 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:14:35,318 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329860316] [2021-05-02 13:14:35,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:14:35,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:14:37,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:14:37,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:14:37,672 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1187 proven. 3060 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:14:37,672 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:14:37,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329860316] [2021-05-02 13:14:37,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329860316] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:14:37,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [756962089] [2021-05-02 13:14:37,673 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:14:37,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:14:37,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 93 conjunts are in the unsatisfiable core [2021-05-02 13:14:37,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:14:38,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:14:38,223 INFO L134 CoverageAnalysis]: Checked inductivity of 4347 backedges. 1187 proven. 3060 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:14:38,223 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [756962089] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:14:38,224 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:14:38,224 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48] total 50 [2021-05-02 13:14:38,224 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701929278] [2021-05-02 13:14:38,225 INFO L460 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-05-02 13:14:38,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:14:38,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-05-02 13:14:38,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=2307, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 13:14:38,227 INFO L87 Difference]: Start difference. First operand 174 states and 176 transitions. Second operand has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:14:47,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:14:47,722 INFO L93 Difference]: Finished difference Result 212 states and 217 transitions. [2021-05-02 13:14:47,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-05-02 13:14:47,724 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 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 173 [2021-05-02 13:14:47,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:14:47,725 INFO L225 Difference]: With dead ends: 212 [2021-05-02 13:14:47,725 INFO L226 Difference]: Without dead ends: 178 [2021-05-02 13:14:47,726 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 175 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1039 ImplicationChecksByTransitivity, 6395.2ms TimeCoverageRelationStatistics Valid=373, Invalid=8747, Unknown=0, NotChecked=0, Total=9120 [2021-05-02 13:14:47,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-05-02 13:14:47,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 177. [2021-05-02 13:14:47,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 172 states have (on average 1.0174418604651163) internal successors, (175), 172 states have internal predecessors, (175), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:14:47,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 179 transitions. [2021-05-02 13:14:47,739 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 179 transitions. Word has length 173 [2021-05-02 13:14:47,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:14:47,739 INFO L480 AbstractCegarLoop]: Abstraction has 177 states and 179 transitions. [2021-05-02 13:14:47,739 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 50 states, 50 states have (on average 3.02) internal successors, (151), 49 states have internal predecessors, (151), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:14:47,740 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 179 transitions. [2021-05-02 13:14:47,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-05-02 13:14:47,741 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:14:47,741 INFO L523 BasicCegarLoop]: trace histogram [55, 55, 46, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:14:47,957 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:14:47,957 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:14:47,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:14:47,958 INFO L82 PathProgramCache]: Analyzing trace with hash -2050727606, now seen corresponding path program 26 times [2021-05-02 13:14:47,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:14:47,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1568420298] [2021-05-02 13:14:47,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:14:48,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:14:49,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:14:49,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:14:49,672 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1213 proven. 3197 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:14:49,673 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:14:49,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1568420298] [2021-05-02 13:14:49,673 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1568420298] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:14:49,673 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [356713790] [2021-05-02 13:14:49,673 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:14:49,755 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:14:49,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:14:49,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 95 conjunts are in the unsatisfiable core [2021-05-02 13:14:49,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:14:50,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:14:50,322 INFO L134 CoverageAnalysis]: Checked inductivity of 4510 backedges. 1213 proven. 3197 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:14:50,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [356713790] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:14:50,323 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:14:50,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 49] total 51 [2021-05-02 13:14:50,324 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564723393] [2021-05-02 13:14:50,324 INFO L460 AbstractCegarLoop]: Interpolant automaton has 51 states [2021-05-02 13:14:50,324 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:14:50,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-05-02 13:14:50,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2404, Unknown=0, NotChecked=0, Total=2550 [2021-05-02 13:14:50,325 INFO L87 Difference]: Start difference. First operand 177 states and 179 transitions. Second operand has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:14:58,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:14:58,273 INFO L93 Difference]: Finished difference Result 215 states and 220 transitions. [2021-05-02 13:14:58,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-05-02 13:14:58,275 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 176 [2021-05-02 13:14:58,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:14:58,276 INFO L225 Difference]: With dead ends: 215 [2021-05-02 13:14:58,276 INFO L226 Difference]: Without dead ends: 181 [2021-05-02 13:14:58,278 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 178 SyntacticMatches, 1 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1085 ImplicationChecksByTransitivity, 4996.0ms TimeCoverageRelationStatistics Valid=381, Invalid=9125, Unknown=0, NotChecked=0, Total=9506 [2021-05-02 13:14:58,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2021-05-02 13:14:58,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 180. [2021-05-02 13:14:58,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 175 states have (on average 1.0171428571428571) internal successors, (178), 175 states have internal predecessors, (178), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:14:58,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 182 transitions. [2021-05-02 13:14:58,303 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 182 transitions. Word has length 176 [2021-05-02 13:14:58,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:14:58,304 INFO L480 AbstractCegarLoop]: Abstraction has 180 states and 182 transitions. [2021-05-02 13:14:58,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 51 states, 51 states have (on average 3.019607843137255) internal successors, (154), 50 states have internal predecessors, (154), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:14:58,304 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 182 transitions. [2021-05-02 13:14:58,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2021-05-02 13:14:58,305 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:14:58,305 INFO L523 BasicCegarLoop]: trace histogram [56, 56, 47, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:14:58,513 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 13:14:58,514 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:14:58,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:14:58,514 INFO L82 PathProgramCache]: Analyzing trace with hash 2107430242, now seen corresponding path program 27 times [2021-05-02 13:14:58,514 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:14:58,514 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007621661] [2021-05-02 13:14:58,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:14:58,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:00,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:00,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:00,775 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1239 proven. 3337 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-05-02 13:15:00,775 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:00,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007621661] [2021-05-02 13:15:00,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007621661] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:00,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [277949303] [2021-05-02 13:15:00,776 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:01,095 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-05-02 13:15:01,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:01,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 13:15:01,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:04,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:04,456 INFO L134 CoverageAnalysis]: Checked inductivity of 4676 backedges. 1353 proven. 126 refuted. 0 times theorem prover too weak. 3197 trivial. 0 not checked. [2021-05-02 13:15:04,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [277949303] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:04,457 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:04,457 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 15] total 64 [2021-05-02 13:15:04,457 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279509074] [2021-05-02 13:15:04,457 INFO L460 AbstractCegarLoop]: Interpolant automaton has 64 states [2021-05-02 13:15:04,458 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:04,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-05-02 13:15:04,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=3847, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 13:15:04,459 INFO L87 Difference]: Start difference. First operand 180 states and 182 transitions. Second operand has 64 states, 64 states have (on average 2.9375) internal successors, (188), 63 states have internal predecessors, (188), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:08,083 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 38 [2021-05-02 13:15:09,064 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 38 [2021-05-02 13:15:21,840 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 45 [2021-05-02 13:15:23,216 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 45 [2021-05-02 13:15:24,186 WARN L205 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2021-05-02 13:15:25,233 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2021-05-02 13:15:26,411 WARN L205 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2021-05-02 13:15:27,808 WARN L205 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2021-05-02 13:15:28,984 WARN L205 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 45 [2021-05-02 13:15:30,006 WARN L205 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 45 [2021-05-02 13:15:32,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:32,279 INFO L93 Difference]: Finished difference Result 232 states and 243 transitions. [2021-05-02 13:15:32,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2021-05-02 13:15:32,280 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.9375) internal successors, (188), 63 states have internal predecessors, (188), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 179 [2021-05-02 13:15:32,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:32,280 INFO L225 Difference]: With dead ends: 232 [2021-05-02 13:15:32,281 INFO L226 Difference]: Without dead ends: 198 [2021-05-02 13:15:32,282 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 169 SyntacticMatches, 1 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2174 ImplicationChecksByTransitivity, 24246.1ms TimeCoverageRelationStatistics Valid=1230, Invalid=15540, Unknown=0, NotChecked=0, Total=16770 [2021-05-02 13:15:32,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-05-02 13:15:32,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 190. [2021-05-02 13:15:32,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 185 states have (on average 1.0162162162162163) internal successors, (188), 185 states have internal predecessors, (188), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:32,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 192 transitions. [2021-05-02 13:15:32,306 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 192 transitions. Word has length 179 [2021-05-02 13:15:32,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:32,306 INFO L480 AbstractCegarLoop]: Abstraction has 190 states and 192 transitions. [2021-05-02 13:15:32,307 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 64 states, 64 states have (on average 2.9375) internal successors, (188), 63 states have internal predecessors, (188), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:32,307 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 192 transitions. [2021-05-02 13:15:32,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-05-02 13:15:32,308 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:32,308 INFO L523 BasicCegarLoop]: trace histogram [59, 59, 49, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:32,514 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:32,514 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:32,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:32,515 INFO L82 PathProgramCache]: Analyzing trace with hash -1730221300, now seen corresponding path program 28 times [2021-05-02 13:15:32,515 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:32,515 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401131539] [2021-05-02 13:15:32,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:32,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:35,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:35,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:35,800 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1440 proven. 3626 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 13:15:35,800 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:35,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401131539] [2021-05-02 13:15:35,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401131539] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:35,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79172590] [2021-05-02 13:15:35,801 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:35,906 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:15:35,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:35,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 101 conjunts are in the unsatisfiable core [2021-05-02 13:15:35,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:36,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:36,712 INFO L134 CoverageAnalysis]: Checked inductivity of 5192 backedges. 1440 proven. 3626 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 13:15:36,712 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [79172590] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:36,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:36,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 52] total 54 [2021-05-02 13:15:36,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132220024] [2021-05-02 13:15:36,713 INFO L460 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-05-02 13:15:36,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:36,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-05-02 13:15:36,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2707, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 13:15:36,714 INFO L87 Difference]: Start difference. First operand 190 states and 192 transitions. Second operand has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:51,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:51,471 INFO L93 Difference]: Finished difference Result 232 states and 237 transitions. [2021-05-02 13:15:51,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-05-02 13:15:51,474 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 2 states have call successors, (4), 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 188 [2021-05-02 13:15:51,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:51,475 INFO L225 Difference]: With dead ends: 232 [2021-05-02 13:15:51,475 INFO L226 Difference]: Without dead ends: 194 [2021-05-02 13:15:51,476 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 190 SyntacticMatches, 1 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1229 ImplicationChecksByTransitivity, 8416.1ms TimeCoverageRelationStatistics Valid=405, Invalid=10307, Unknown=0, NotChecked=0, Total=10712 [2021-05-02 13:15:51,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-05-02 13:15:51,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 193. [2021-05-02 13:15:51,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:51,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2021-05-02 13:15:51,486 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 188 [2021-05-02 13:15:51,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:51,486 INFO L480 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2021-05-02 13:15:51,486 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 54 states, 54 states have (on average 3.0185185185185186) internal successors, (163), 53 states have internal predecessors, (163), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:51,487 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2021-05-02 13:15:51,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-05-02 13:15:51,487 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:51,487 INFO L523 BasicCegarLoop]: trace histogram [60, 60, 50, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:51,708 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 13:15:51,709 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:51,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:51,709 INFO L82 PathProgramCache]: Analyzing trace with hash 1207040804, now seen corresponding path program 29 times [2021-05-02 13:15:51,709 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:51,709 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35222100] [2021-05-02 13:15:51,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:51,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:54,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:54,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:54,234 INFO L134 CoverageAnalysis]: Checked inductivity of 5370 backedges. 1469 proven. 3775 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2021-05-02 13:15:54,234 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:54,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35222100] [2021-05-02 13:15:54,235 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35222100] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:54,235 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853447021] [2021-05-02 13:15:54,235 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true