/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/nested3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:15:34,125 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:15:34,127 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:15:34,148 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 13:15:34,155 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:15:34,155 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:15:34,156 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:15:34,157 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:15:34,157 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:15:34,158 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:15:34,159 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:15:34,160 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:15:34,161 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:15:34,162 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:15:34,174 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:15:34,174 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:15:34,176 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 13:15:34,181 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:15:34,182 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:15:34,182 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:15:34,183 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 13:15:34,218 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:15:34,219 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:15:34,221 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:15:34,222 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:15:34,222 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:15:34,222 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:15:34,222 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:15:34,222 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:15:34,222 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:15:34,222 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:15:34,222 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:15:34,222 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:15:34,223 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:15:34,223 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:15:34,223 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:15:34,223 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:15:34,223 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:15:34,223 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:15:34,223 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:15:34,223 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:15:34,224 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:15:34,224 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:15:34,224 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:15:34,224 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:15:34,224 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:15:34,224 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:15:34,224 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:15:34,224 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:15:34,225 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:15:34,457 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:15:34,483 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:15:34,486 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:15:34,486 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:15:34,487 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:15:34,488 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested3-1.c [2021-05-02 13:15:34,564 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5b9a17b09/cfdecbcbc00547eeb071703f06e0b655/FLAG2e100e8e8 [2021-05-02 13:15:35,182 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:15:35,183 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested3-1.c [2021-05-02 13:15:35,187 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5b9a17b09/cfdecbcbc00547eeb071703f06e0b655/FLAG2e100e8e8 [2021-05-02 13:15:35,532 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5b9a17b09/cfdecbcbc00547eeb071703f06e0b655 [2021-05-02 13:15:35,534 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:15:35,535 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:15:35,536 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:15:35,536 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:15:35,541 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:15:35,541 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:15:35" (1/1) ... [2021-05-02 13:15:35,542 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@682bac1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:35, skipping insertion in model container [2021-05-02 13:15:35,542 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:15:35" (1/1) ... [2021-05-02 13:15:35,547 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:15:35,556 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:15:35,632 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/nested3-1.c[321,334] [2021-05-02 13:15:35,640 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:15:35,645 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:15:35,658 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/nested3-1.c[321,334] [2021-05-02 13:15:35,670 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:15:35,681 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:15:35,682 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:35 WrapperNode [2021-05-02 13:15:35,682 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:15:35,684 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:15:35,684 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:15:35,685 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:15:35,723 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:35" (1/1) ... [2021-05-02 13:15:35,724 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:35" (1/1) ... [2021-05-02 13:15:35,735 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:35" (1/1) ... [2021-05-02 13:15:35,735 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:35" (1/1) ... [2021-05-02 13:15:35,748 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:35" (1/1) ... [2021-05-02 13:15:35,752 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:35" (1/1) ... [2021-05-02 13:15:35,753 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:35" (1/1) ... [2021-05-02 13:15:35,757 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:15:35,758 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:15:35,758 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:15:35,758 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:15:35,758 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:35" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:15:35,832 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:15:35,832 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:15:35,832 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:15:35,832 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:15:35,832 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:15:35,832 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:15:35,833 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:15:35,833 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:15:35,833 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:15:35,834 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:15:35,834 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:15:35,834 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:15:35,834 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:15:35,834 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:15:35,835 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:15:35,835 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:15:35,835 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:15:36,055 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:15:36,056 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-02 13:15:36,057 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:15:36 BoogieIcfgContainer [2021-05-02 13:15:36,057 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:15:36,058 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:15:36,058 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:15:36,060 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:15:36,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:15:35" (1/3) ... [2021-05-02 13:15:36,061 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b36b812 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:15:36, skipping insertion in model container [2021-05-02 13:15:36,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:15:35" (2/3) ... [2021-05-02 13:15:36,061 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b36b812 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:15:36, skipping insertion in model container [2021-05-02 13:15:36,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:15:36" (3/3) ... [2021-05-02 13:15:36,062 INFO L111 eAbstractionObserver]: Analyzing ICFG nested3-1.c [2021-05-02 13:15:36,066 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:15:36,069 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:15:36,081 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:15:36,097 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:15:36,097 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:15:36,097 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:15:36,097 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:15:36,097 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:15:36,098 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:15:36,098 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:15:36,098 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:15:36,108 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:15:36,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:15:36,111 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:36,112 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:36,112 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:36,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:36,115 INFO L82 PathProgramCache]: Analyzing trace with hash -1794590667, now seen corresponding path program 1 times [2021-05-02 13:15:36,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:36,126 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [19948818] [2021-05-02 13:15:36,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:36,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:36,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:36,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:36,373 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:36,373 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:36,374 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [19948818] [2021-05-02 13:15:36,375 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [19948818] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:15:36,375 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:15:36,375 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:15:36,376 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809799055] [2021-05-02 13:15:36,379 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:15:36,379 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:36,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:15:36,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:15:36,392 INFO L87 Difference]: Start difference. First operand has 25 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:36,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:36,481 INFO L93 Difference]: Finished difference Result 44 states and 63 transitions. [2021-05-02 13:15:36,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:15:36,483 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:15:36,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:36,488 INFO L225 Difference]: With dead ends: 44 [2021-05-02 13:15:36,488 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 13:15:36,491 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 60.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:15:36,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 13:15:36,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-02 13:15:36,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:36,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-05-02 13:15:36,526 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 11 [2021-05-02 13:15:36,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:36,526 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-05-02 13:15:36,526 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:36,526 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-05-02 13:15:36,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:15:36,527 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:36,527 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:36,527 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:15:36,528 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:36,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:36,529 INFO L82 PathProgramCache]: Analyzing trace with hash -1824143339, now seen corresponding path program 1 times [2021-05-02 13:15:36,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:36,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2078148291] [2021-05-02 13:15:36,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:36,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:36,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:36,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:36,631 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:36,631 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:36,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2078148291] [2021-05-02 13:15:36,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2078148291] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:15:36,632 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:15:36,632 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:15:36,632 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [548683131] [2021-05-02 13:15:36,633 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:15:36,633 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:36,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:15:36,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:15:36,634 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:36,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:36,756 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2021-05-02 13:15:36,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:15:36,757 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:15:36,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:36,763 INFO L225 Difference]: With dead ends: 34 [2021-05-02 13:15:36,763 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 13:15:36,764 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 52.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:15:36,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 13:15:36,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 21. [2021-05-02 13:15:36,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:36,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-05-02 13:15:36,773 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 11 [2021-05-02 13:15:36,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:36,773 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-05-02 13:15:36,776 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:36,777 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-05-02 13:15:36,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 13:15:36,777 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:36,778 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:36,778 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:15:36,778 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:36,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:36,779 INFO L82 PathProgramCache]: Analyzing trace with hash -699512288, now seen corresponding path program 1 times [2021-05-02 13:15:36,779 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:36,779 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [598606119] [2021-05-02 13:15:36,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:36,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:36,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:36,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:36,856 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:36,856 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:36,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [598606119] [2021-05-02 13:15:36,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [598606119] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:15:36,856 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:15:36,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:15:36,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624416547] [2021-05-02 13:15:36,857 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:15:36,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:36,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:15:36,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:15:36,858 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:37,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:37,066 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-05-02 13:15:37,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:15:37,067 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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 12 [2021-05-02 13:15:37,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:37,068 INFO L225 Difference]: With dead ends: 39 [2021-05-02 13:15:37,068 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 13:15:37,068 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 72.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:15:37,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 13:15:37,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2021-05-02 13:15:37,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 15 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:37,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-05-02 13:15:37,075 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 12 [2021-05-02 13:15:37,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:37,075 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-05-02 13:15:37,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:37,076 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-05-02 13:15:37,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 13:15:37,076 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:37,076 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:37,076 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 13:15:37,076 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:37,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:37,086 INFO L82 PathProgramCache]: Analyzing trace with hash -185588926, now seen corresponding path program 1 times [2021-05-02 13:15:37,086 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:37,086 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588431986] [2021-05-02 13:15:37,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:37,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:37,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:37,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:37,208 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:37,208 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:37,208 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588431986] [2021-05-02 13:15:37,208 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588431986] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:15:37,208 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:15:37,209 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 13:15:37,209 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950403703] [2021-05-02 13:15:37,209 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 13:15:37,209 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:37,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 13:15:37,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 13:15:37,210 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:37,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:37,319 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2021-05-02 13:15:37,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 13:15:37,321 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 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 13 [2021-05-02 13:15:37,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:37,322 INFO L225 Difference]: With dead ends: 39 [2021-05-02 13:15:37,322 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 13:15:37,322 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 53.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 13:15:37,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 13:15:37,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2021-05-02 13:15:37,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:37,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-05-02 13:15:37,330 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 13 [2021-05-02 13:15:37,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:37,330 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-05-02 13:15:37,330 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:37,330 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-05-02 13:15:37,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-02 13:15:37,331 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:37,331 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:37,331 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 13:15:37,331 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:37,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:37,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1431986846, now seen corresponding path program 1 times [2021-05-02 13:15:37,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:37,332 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622095175] [2021-05-02 13:15:37,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:37,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:37,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:37,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:37,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:37,454 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:37,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622095175] [2021-05-02 13:15:37,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622095175] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:37,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1357848163] [2021-05-02 13:15:37,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:37,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:37,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 13:15:37,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:37,588 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:37,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1357848163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:37,589 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:37,589 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 13:15:37,589 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585569140] [2021-05-02 13:15:37,590 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:15:37,590 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:37,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:15:37,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:15:37,591 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:37,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:37,703 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2021-05-02 13:15:37,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:15:37,704 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-02 13:15:37,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:37,705 INFO L225 Difference]: With dead ends: 41 [2021-05-02 13:15:37,705 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 13:15:37,705 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 88.1ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:15:37,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 13:15:37,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-02 13:15:37,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:37,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-05-02 13:15:37,711 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 14 [2021-05-02 13:15:37,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:37,712 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-05-02 13:15:37,712 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:37,712 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-05-02 13:15:37,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 13:15:37,712 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:37,712 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:37,929 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:37,930 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:37,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:37,931 INFO L82 PathProgramCache]: Analyzing trace with hash -1415616702, now seen corresponding path program 2 times [2021-05-02 13:15:37,931 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:37,931 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [519938223] [2021-05-02 13:15:37,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:37,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:38,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:38,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:38,034 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:38,034 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:38,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [519938223] [2021-05-02 13:15:38,035 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [519938223] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:38,035 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1898781363] [2021-05-02 13:15:38,035 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:38,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:15:38,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:38,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 13:15:38,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:38,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:38,254 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:38,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1898781363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:38,255 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:38,255 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 13:15:38,255 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645956152] [2021-05-02 13:15:38,256 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:15:38,256 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:38,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:15:38,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:15:38,257 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:38,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:38,455 INFO L93 Difference]: Finished difference Result 43 states and 52 transitions. [2021-05-02 13:15:38,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:15:38,455 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-02 13:15:38,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:38,457 INFO L225 Difference]: With dead ends: 43 [2021-05-02 13:15:38,457 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 13:15:38,459 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 125.8ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:15:38,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 13:15:38,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-02 13:15:38,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:38,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2021-05-02 13:15:38,472 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 15 [2021-05-02 13:15:38,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:38,473 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2021-05-02 13:15:38,473 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:38,473 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2021-05-02 13:15:38,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 13:15:38,474 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:38,474 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:38,681 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:38,681 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:38,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:38,682 INFO L82 PathProgramCache]: Analyzing trace with hash -908142238, now seen corresponding path program 3 times [2021-05-02 13:15:38,682 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:38,682 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834897904] [2021-05-02 13:15:38,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:38,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:38,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:38,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:38,813 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:38,814 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:38,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834897904] [2021-05-02 13:15:38,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834897904] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:38,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108014517] [2021-05-02 13:15:38,814 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:38,896 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 13:15:38,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:38,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:15:38,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:39,019 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:39,032 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:39,206 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-05-02 13:15:39,206 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108014517] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:15:39,207 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:15:39,207 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 11 [2021-05-02 13:15:39,207 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190534145] [2021-05-02 13:15:39,207 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:15:39,207 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:39,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:15:39,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:15:39,208 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:39,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:39,520 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2021-05-02 13:15:39,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:15:39,521 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-02 13:15:39,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:39,523 INFO L225 Difference]: With dead ends: 32 [2021-05-02 13:15:39,523 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 13:15:39,524 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 503.2ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:15:39,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 13:15:39,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-05-02 13:15:39,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.2) internal successors, (24), 21 states have internal predecessors, (24), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:39,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2021-05-02 13:15:39,539 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 16 [2021-05-02 13:15:39,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:39,539 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2021-05-02 13:15:39,539 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:15:39,539 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2021-05-02 13:15:39,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 13:15:39,540 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:39,540 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:39,741 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:39,741 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:39,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:39,742 INFO L82 PathProgramCache]: Analyzing trace with hash -1400074750, now seen corresponding path program 1 times [2021-05-02 13:15:39,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:39,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281625206] [2021-05-02 13:15:39,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:39,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:39,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:39,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:39,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-05-02 13:15:39,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:39,880 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:15:39,881 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:39,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281625206] [2021-05-02 13:15:39,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1281625206] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:39,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560186317] [2021-05-02 13:15:39,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:39,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:39,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 13:15:39,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:40,040 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 13:15:40,040 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560186317] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:40,040 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:40,041 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2021-05-02 13:15:40,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829392287] [2021-05-02 13:15:40,041 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:15:40,041 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:40,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:15:40,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:15:40,042 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:40,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:40,555 INFO L93 Difference]: Finished difference Result 68 states and 82 transitions. [2021-05-02 13:15:40,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:15:40,555 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 23 [2021-05-02 13:15:40,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:40,556 INFO L225 Difference]: With dead ends: 68 [2021-05-02 13:15:40,556 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 13:15:40,557 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 453.5ms TimeCoverageRelationStatistics Valid=134, Invalid=466, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:15:40,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 13:15:40,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 38. [2021-05-02 13:15:40,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 28 states have (on average 1.1785714285714286) internal successors, (33), 29 states have internal predecessors, (33), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 13:15:40,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-05-02 13:15:40,564 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 23 [2021-05-02 13:15:40,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:40,564 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-05-02 13:15:40,565 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.3636363636363638) internal successors, (26), 10 states have internal predecessors, (26), 3 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 13:15:40,565 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-05-02 13:15:40,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 13:15:40,565 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:40,565 INFO L523 BasicCegarLoop]: trace histogram [8, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:40,781 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:40,781 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:40,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:40,782 INFO L82 PathProgramCache]: Analyzing trace with hash -1701412060, now seen corresponding path program 2 times [2021-05-02 13:15:40,782 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:40,782 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866501344] [2021-05-02 13:15:40,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:40,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:40,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:40,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:40,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2021-05-02 13:15:40,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:40,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-02 13:15:40,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:40,948 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 31 proven. 10 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-05-02 13:15:40,949 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:40,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866501344] [2021-05-02 13:15:40,949 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [866501344] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:40,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160565270] [2021-05-02 13:15:40,949 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:41,002 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:15:41,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:41,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:15:41,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:41,132 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 4 proven. 39 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 13:15:41,132 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [160565270] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:41,132 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:41,133 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-05-02 13:15:41,133 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781459284] [2021-05-02 13:15:41,133 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:15:41,133 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:41,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:15:41,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:15:41,134 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 14 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 4 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 13:15:41,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:41,953 INFO L93 Difference]: Finished difference Result 89 states and 108 transitions. [2021-05-02 13:15:41,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-02 13:15:41,954 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 4 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 36 [2021-05-02 13:15:41,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:41,954 INFO L225 Difference]: With dead ends: 89 [2021-05-02 13:15:41,954 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 13:15:41,955 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 684.6ms TimeCoverageRelationStatistics Valid=222, Invalid=1110, Unknown=0, NotChecked=0, Total=1332 [2021-05-02 13:15:41,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 13:15:41,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 49. [2021-05-02 13:15:41,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 39 states have internal predecessors, (44), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:15:41,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 56 transitions. [2021-05-02 13:15:41,964 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 56 transitions. Word has length 36 [2021-05-02 13:15:41,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:41,965 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 56 transitions. [2021-05-02 13:15:41,965 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.5) internal successors, (35), 13 states have internal predecessors, (35), 4 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 13:15:41,965 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 56 transitions. [2021-05-02 13:15:41,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 13:15:41,966 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:41,966 INFO L523 BasicCegarLoop]: trace histogram [15, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:42,180 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:42,181 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:42,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:42,181 INFO L82 PathProgramCache]: Analyzing trace with hash -1216595262, now seen corresponding path program 3 times [2021-05-02 13:15:42,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:42,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942716290] [2021-05-02 13:15:42,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:42,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:42,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:42,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:42,291 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-02 13:15:42,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:42,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 13:15:42,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:42,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-02 13:15:42,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:42,315 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 81 proven. 15 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2021-05-02 13:15:42,316 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:42,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942716290] [2021-05-02 13:15:42,316 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942716290] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:42,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [276280876] [2021-05-02 13:15:42,316 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:42,440 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-05-02 13:15:42,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:42,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:15:42,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:42,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:42,568 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 91 proven. 15 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2021-05-02 13:15:42,569 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [276280876] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:42,569 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:42,569 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 13:15:42,572 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553938321] [2021-05-02 13:15:42,573 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:15:42,574 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:42,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:15:42,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:15:42,576 INFO L87 Difference]: Start difference. First operand 49 states and 56 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:15:42,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:42,788 INFO L93 Difference]: Finished difference Result 95 states and 112 transitions. [2021-05-02 13:15:42,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 13:15:42,789 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 51 [2021-05-02 13:15:42,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:42,793 INFO L225 Difference]: With dead ends: 95 [2021-05-02 13:15:42,793 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 13:15:42,796 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 58 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 189.9ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:15:42,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 13:15:42,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-05-02 13:15:42,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 41 states have (on average 1.146341463414634) internal successors, (47), 42 states have internal predecessors, (47), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:15:42,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 59 transitions. [2021-05-02 13:15:42,815 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 59 transitions. Word has length 51 [2021-05-02 13:15:42,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:42,815 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 59 transitions. [2021-05-02 13:15:42,816 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 9 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:15:42,816 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 59 transitions. [2021-05-02 13:15:42,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 13:15:42,817 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:42,817 INFO L523 BasicCegarLoop]: trace histogram [18, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:43,024 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:43,025 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:43,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:43,025 INFO L82 PathProgramCache]: Analyzing trace with hash 243654054, now seen corresponding path program 4 times [2021-05-02 13:15:43,025 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:43,025 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588881397] [2021-05-02 13:15:43,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:43,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:43,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:43,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:43,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-05-02 13:15:43,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:43,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-02 13:15:43,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:43,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-02 13:15:43,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:43,159 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 107 proven. 21 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-02 13:15:43,159 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:43,159 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588881397] [2021-05-02 13:15:43,160 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588881397] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:43,160 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1800888891] [2021-05-02 13:15:43,160 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:43,214 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:15:43,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:43,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 13:15:43,218 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:43,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:43,305 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 101 proven. 21 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2021-05-02 13:15:43,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1800888891] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:43,306 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:43,306 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 13:15:43,306 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441244073] [2021-05-02 13:15:43,306 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 13:15:43,306 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:43,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 13:15:43,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 13:15:43,307 INFO L87 Difference]: Start difference. First operand 52 states and 59 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:15:43,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:43,611 INFO L93 Difference]: Finished difference Result 101 states and 118 transitions. [2021-05-02 13:15:43,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 13:15:43,612 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 54 [2021-05-02 13:15:43,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:43,613 INFO L225 Difference]: With dead ends: 101 [2021-05-02 13:15:43,613 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 13:15:43,613 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 239.6ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:15:43,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 13:15:43,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-02 13:15:43,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 44 states have (on average 1.1363636363636365) internal successors, (50), 45 states have internal predecessors, (50), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:15:43,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 62 transitions. [2021-05-02 13:15:43,622 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 62 transitions. Word has length 54 [2021-05-02 13:15:43,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:43,622 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 62 transitions. [2021-05-02 13:15:43,623 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:15:43,623 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 62 transitions. [2021-05-02 13:15:43,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 13:15:43,624 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:43,624 INFO L523 BasicCegarLoop]: trace histogram [21, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:43,837 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:43,837 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:43,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:43,838 INFO L82 PathProgramCache]: Analyzing trace with hash 469900866, now seen corresponding path program 5 times [2021-05-02 13:15:43,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:43,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438278376] [2021-05-02 13:15:43,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:43,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:43,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:43,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:43,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 13:15:43,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:43,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-02 13:15:43,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:44,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-02 13:15:44,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:44,004 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 137 proven. 28 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2021-05-02 13:15:44,005 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:44,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438278376] [2021-05-02 13:15:44,005 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438278376] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:44,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059331219] [2021-05-02 13:15:44,005 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:44,049 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 13:15:44,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:44,051 WARN L261 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:15:44,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:44,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:44,190 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 210 proven. 28 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-05-02 13:15:44,190 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059331219] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:44,191 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:44,191 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 13:15:44,191 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790716604] [2021-05-02 13:15:44,191 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 13:15:44,191 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:44,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 13:15:44,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 13:15:44,192 INFO L87 Difference]: Start difference. First operand 55 states and 62 transitions. Second operand has 12 states, 12 states have (on average 2.75) internal successors, (33), 11 states have internal predecessors, (33), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:15:44,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:44,518 INFO L93 Difference]: Finished difference Result 107 states and 124 transitions. [2021-05-02 13:15:44,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 13:15:44,519 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 11 states have internal predecessors, (33), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 57 [2021-05-02 13:15:44,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:44,520 INFO L225 Difference]: With dead ends: 107 [2021-05-02 13:15:44,520 INFO L226 Difference]: Without dead ends: 59 [2021-05-02 13:15:44,522 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 59 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 303.6ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:15:44,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-05-02 13:15:44,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-05-02 13:15:44,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 47 states have (on average 1.127659574468085) internal successors, (53), 48 states have internal predecessors, (53), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:15:44,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 65 transitions. [2021-05-02 13:15:44,539 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 65 transitions. Word has length 57 [2021-05-02 13:15:44,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:44,539 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 65 transitions. [2021-05-02 13:15:44,540 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.75) internal successors, (33), 11 states have internal predecessors, (33), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:15:44,540 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 65 transitions. [2021-05-02 13:15:44,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 13:15:44,540 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:44,541 INFO L523 BasicCegarLoop]: trace histogram [24, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:44,756 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 13:15:44,757 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:44,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:44,757 INFO L82 PathProgramCache]: Analyzing trace with hash -578639834, now seen corresponding path program 6 times [2021-05-02 13:15:44,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:44,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815003521] [2021-05-02 13:15:44,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:44,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:44,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:44,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:44,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 13:15:44,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:44,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-05-02 13:15:44,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:44,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-05-02 13:15:44,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:44,945 INFO L134 CoverageAnalysis]: Checked inductivity of 381 backedges. 171 proven. 36 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2021-05-02 13:15:44,945 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:44,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815003521] [2021-05-02 13:15:44,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1815003521] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:44,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828416358] [2021-05-02 13:15:44,945 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:45,137 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-05-02 13:15:45,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:45,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 13:15:45,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:45,257 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:45,284 INFO L134 CoverageAnalysis]: Checked inductivity of 381 backedges. 261 proven. 36 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2021-05-02 13:15:45,284 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828416358] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:45,284 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:45,284 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2021-05-02 13:15:45,284 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178319030] [2021-05-02 13:15:45,285 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 13:15:45,285 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:45,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 13:15:45,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:15:45,286 INFO L87 Difference]: Start difference. First operand 58 states and 65 transitions. Second operand has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:15:45,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:45,632 INFO L93 Difference]: Finished difference Result 113 states and 130 transitions. [2021-05-02 13:15:45,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 13:15:45,633 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 60 [2021-05-02 13:15:45,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:45,634 INFO L225 Difference]: With dead ends: 113 [2021-05-02 13:15:45,634 INFO L226 Difference]: Without dead ends: 62 [2021-05-02 13:15:45,635 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 61 SyntacticMatches, 7 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 341.3ms TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:15:45,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-05-02 13:15:45,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2021-05-02 13:15:45,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 50 states have (on average 1.12) internal successors, (56), 51 states have internal predecessors, (56), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:15:45,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 68 transitions. [2021-05-02 13:15:45,643 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 68 transitions. Word has length 60 [2021-05-02 13:15:45,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:45,643 INFO L480 AbstractCegarLoop]: Abstraction has 61 states and 68 transitions. [2021-05-02 13:15:45,643 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.6153846153846154) internal successors, (34), 12 states have internal predecessors, (34), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:15:45,643 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 68 transitions. [2021-05-02 13:15:45,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-02 13:15:45,644 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:45,644 INFO L523 BasicCegarLoop]: trace histogram [27, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:45,850 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:45,851 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:45,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:45,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1427676734, now seen corresponding path program 7 times [2021-05-02 13:15:45,852 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:45,852 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942502845] [2021-05-02 13:15:45,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:45,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:46,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:46,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:46,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-02 13:15:46,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:46,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-05-02 13:15:46,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:46,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-05-02 13:15:46,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:46,042 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 209 proven. 45 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2021-05-02 13:15:46,043 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:46,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942502845] [2021-05-02 13:15:46,043 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942502845] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:46,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714717084] [2021-05-02 13:15:46,043 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:46,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:46,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 13:15:46,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:46,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:46,219 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 203 proven. 45 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2021-05-02 13:15:46,220 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714717084] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:46,220 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:46,220 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2021-05-02 13:15:46,221 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095605804] [2021-05-02 13:15:46,223 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 13:15:46,223 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:46,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 13:15:46,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-02 13:15:46,225 INFO L87 Difference]: Start difference. First operand 61 states and 68 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:15:46,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:46,595 INFO L93 Difference]: Finished difference Result 119 states and 136 transitions. [2021-05-02 13:15:46,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 13:15:46,595 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 63 [2021-05-02 13:15:46,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:46,596 INFO L225 Difference]: With dead ends: 119 [2021-05-02 13:15:46,596 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 13:15:46,597 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 366.1ms TimeCoverageRelationStatistics Valid=85, Invalid=467, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:15:46,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 13:15:46,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-05-02 13:15:46,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 54 states have internal predecessors, (59), 7 states have call successors, (7), 4 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:15:46,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 71 transitions. [2021-05-02 13:15:46,605 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 71 transitions. Word has length 63 [2021-05-02 13:15:46,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:46,605 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 71 transitions. [2021-05-02 13:15:46,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 13 states have internal predecessors, (31), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:15:46,605 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 71 transitions. [2021-05-02 13:15:46,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-02 13:15:46,608 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:46,608 INFO L523 BasicCegarLoop]: trace histogram [30, 4, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:46,828 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:46,828 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:46,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:46,829 INFO L82 PathProgramCache]: Analyzing trace with hash 402461350, now seen corresponding path program 8 times [2021-05-02 13:15:46,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:46,829 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472828550] [2021-05-02 13:15:46,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:46,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:46,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:46,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:46,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-05-02 13:15:46,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:46,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-02 13:15:46,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:46,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-05-02 13:15:46,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:46,977 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 251 proven. 55 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-05-02 13:15:46,978 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:46,978 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472828550] [2021-05-02 13:15:46,978 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472828550] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:46,978 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073397908] [2021-05-02 13:15:46,978 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:47,035 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:15:47,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:47,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 13:15:47,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:47,172 INFO L134 CoverageAnalysis]: Checked inductivity of 558 backedges. 6 proven. 375 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2021-05-02 13:15:47,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1073397908] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:47,173 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:47,173 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 6] total 18 [2021-05-02 13:15:47,173 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [703391513] [2021-05-02 13:15:47,173 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:15:47,173 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:47,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:15:47,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=263, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:15:47,174 INFO L87 Difference]: Start difference. First operand 64 states and 71 transitions. Second operand has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:15:49,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:49,398 INFO L93 Difference]: Finished difference Result 154 states and 178 transitions. [2021-05-02 13:15:49,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2021-05-02 13:15:49,399 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 66 [2021-05-02 13:15:49,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:49,400 INFO L225 Difference]: With dead ends: 154 [2021-05-02 13:15:49,400 INFO L226 Difference]: Without dead ends: 97 [2021-05-02 13:15:49,403 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1683 ImplicationChecksByTransitivity, 1760.8ms TimeCoverageRelationStatistics Valid=551, Invalid=5301, Unknown=0, NotChecked=0, Total=5852 [2021-05-02 13:15:49,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-05-02 13:15:49,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 82. [2021-05-02 13:15:49,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 70 states have (on average 1.1) internal successors, (77), 71 states have internal predecessors, (77), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 13:15:49,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 91 transitions. [2021-05-02 13:15:49,415 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 91 transitions. Word has length 66 [2021-05-02 13:15:49,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:49,416 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 91 transitions. [2021-05-02 13:15:49,416 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.3333333333333335) internal successors, (42), 17 states have internal predecessors, (42), 5 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 13:15:49,416 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 91 transitions. [2021-05-02 13:15:49,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-05-02 13:15:49,418 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:49,418 INFO L523 BasicCegarLoop]: trace histogram [44, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:49,633 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 13:15:49,633 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:49,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:49,634 INFO L82 PathProgramCache]: Analyzing trace with hash 591428512, now seen corresponding path program 9 times [2021-05-02 13:15:49,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:49,634 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079263657] [2021-05-02 13:15:49,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:49,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:49,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:49,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:49,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-05-02 13:15:49,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:49,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-02 13:15:49,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:49,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-05-02 13:15:49,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:49,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2021-05-02 13:15:49,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:49,832 INFO L134 CoverageAnalysis]: Checked inductivity of 1182 backedges. 444 proven. 66 refuted. 0 times theorem prover too weak. 672 trivial. 0 not checked. [2021-05-02 13:15:49,833 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:49,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079263657] [2021-05-02 13:15:49,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079263657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:49,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557569713] [2021-05-02 13:15:49,833 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:50,142 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-05-02 13:15:50,142 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:50,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 13:15:50,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:50,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:50,279 INFO L134 CoverageAnalysis]: Checked inductivity of 1182 backedges. 460 proven. 66 refuted. 0 times theorem prover too weak. 656 trivial. 0 not checked. [2021-05-02 13:15:50,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1557569713] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:50,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:50,280 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2021-05-02 13:15:50,280 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885661315] [2021-05-02 13:15:50,280 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 13:15:50,280 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:50,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 13:15:50,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 13:15:50,281 INFO L87 Difference]: Start difference. First operand 82 states and 91 transitions. Second operand has 16 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:15:50,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:50,735 INFO L93 Difference]: Finished difference Result 162 states and 184 transitions. [2021-05-02 13:15:50,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 13:15:50,735 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 88 [2021-05-02 13:15:50,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:50,737 INFO L225 Difference]: With dead ends: 162 [2021-05-02 13:15:50,737 INFO L226 Difference]: Without dead ends: 87 [2021-05-02 13:15:50,738 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 97 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 383.5ms TimeCoverageRelationStatistics Valid=101, Invalid=655, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:15:50,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2021-05-02 13:15:50,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2021-05-02 13:15:50,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 75 states have internal predecessors, (81), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 13:15:50,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 95 transitions. [2021-05-02 13:15:50,751 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 95 transitions. Word has length 88 [2021-05-02 13:15:50,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:50,752 INFO L480 AbstractCegarLoop]: Abstraction has 86 states and 95 transitions. [2021-05-02 13:15:50,752 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.3125) internal successors, (37), 15 states have internal predecessors, (37), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:15:50,752 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 95 transitions. [2021-05-02 13:15:50,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-05-02 13:15:50,753 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:50,753 INFO L523 BasicCegarLoop]: trace histogram [48, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:50,960 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 13:15:50,960 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:50,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:50,961 INFO L82 PathProgramCache]: Analyzing trace with hash -946609112, now seen corresponding path program 10 times [2021-05-02 13:15:50,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:50,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127711776] [2021-05-02 13:15:50,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:50,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:51,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:51,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:51,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-05-02 13:15:51,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:51,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-02 13:15:51,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:51,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-05-02 13:15:51,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:51,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2021-05-02 13:15:51,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:51,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1380 backedges. 519 proven. 78 refuted. 0 times theorem prover too weak. 783 trivial. 0 not checked. [2021-05-02 13:15:51,183 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:51,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1127711776] [2021-05-02 13:15:51,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1127711776] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:51,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102670653] [2021-05-02 13:15:51,183 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:51,254 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:15:51,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:51,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 13:15:51,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:51,517 INFO L134 CoverageAnalysis]: Checked inductivity of 1380 backedges. 8 proven. 1086 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2021-05-02 13:15:51,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102670653] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:51,517 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:51,518 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 12] total 26 [2021-05-02 13:15:51,518 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177094184] [2021-05-02 13:15:51,518 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:15:51,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:51,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:15:51,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=574, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:15:51,519 INFO L87 Difference]: Start difference. First operand 86 states and 95 transitions. Second operand has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 6 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 13:15:54,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:54,538 INFO L93 Difference]: Finished difference Result 203 states and 232 transitions. [2021-05-02 13:15:54,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-05-02 13:15:54,539 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 6 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 92 [2021-05-02 13:15:54,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:54,540 INFO L225 Difference]: With dead ends: 203 [2021-05-02 13:15:54,540 INFO L226 Difference]: Without dead ends: 124 [2021-05-02 13:15:54,543 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3807 ImplicationChecksByTransitivity, 2550.6ms TimeCoverageRelationStatistics Valid=812, Invalid=10960, Unknown=0, NotChecked=0, Total=11772 [2021-05-02 13:15:54,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-05-02 13:15:54,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 107. [2021-05-02 13:15:54,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 94 states have (on average 1.0851063829787233) internal successors, (102), 95 states have internal predecessors, (102), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:15:54,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 118 transitions. [2021-05-02 13:15:54,554 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 118 transitions. Word has length 92 [2021-05-02 13:15:54,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:54,554 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 118 transitions. [2021-05-02 13:15:54,554 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.0384615384615383) internal successors, (53), 25 states have internal predecessors, (53), 6 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 13:15:54,554 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 118 transitions. [2021-05-02 13:15:54,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-05-02 13:15:54,555 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:54,555 INFO L523 BasicCegarLoop]: trace histogram [65, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:54,755 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 13:15:54,756 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:54,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:54,756 INFO L82 PathProgramCache]: Analyzing trace with hash -707936382, now seen corresponding path program 11 times [2021-05-02 13:15:54,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:54,756 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842291391] [2021-05-02 13:15:54,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:54,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:54,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:54,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:54,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 13:15:54,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:54,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-02 13:15:54,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:54,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-05-02 13:15:54,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:54,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85 [2021-05-02 13:15:54,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:54,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 106 [2021-05-02 13:15:54,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:54,982 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 799 proven. 91 refuted. 0 times theorem prover too weak. 1610 trivial. 0 not checked. [2021-05-02 13:15:54,982 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:54,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842291391] [2021-05-02 13:15:54,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [842291391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:54,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178238478] [2021-05-02 13:15:54,983 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:56,644 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 8 check-sat command(s) [2021-05-02 13:15:56,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:15:56,647 WARN L261 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 98 conjunts are in the unsatisfiable core [2021-05-02 13:15:56,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:15:56,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:15:56,923 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 1406 proven. 91 refuted. 0 times theorem prover too weak. 1003 trivial. 0 not checked. [2021-05-02 13:15:56,923 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178238478] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:56,923 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:15:56,924 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2021-05-02 13:15:56,924 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901964732] [2021-05-02 13:15:56,924 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 13:15:56,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:15:56,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 13:15:56,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2021-05-02 13:15:56,925 INFO L87 Difference]: Start difference. First operand 107 states and 118 transitions. Second operand has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:15:57,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:15:57,417 INFO L93 Difference]: Finished difference Result 213 states and 240 transitions. [2021-05-02 13:15:57,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 13:15:57,418 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 117 [2021-05-02 13:15:57,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:15:57,418 INFO L225 Difference]: With dead ends: 213 [2021-05-02 13:15:57,419 INFO L226 Difference]: Without dead ends: 113 [2021-05-02 13:15:57,419 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 117 SyntacticMatches, 12 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 579.0ms TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:15:57,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-05-02 13:15:57,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 112. [2021-05-02 13:15:57,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 99 states have (on average 1.0808080808080809) internal successors, (107), 100 states have internal predecessors, (107), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:15:57,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 123 transitions. [2021-05-02 13:15:57,431 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 123 transitions. Word has length 117 [2021-05-02 13:15:57,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:15:57,431 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 123 transitions. [2021-05-02 13:15:57,431 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.1666666666666665) internal successors, (39), 17 states have internal predecessors, (39), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:15:57,431 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 123 transitions. [2021-05-02 13:15:57,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-05-02 13:15:57,432 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:15:57,432 INFO L523 BasicCegarLoop]: trace histogram [70, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:15:57,636 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:15:57,637 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:15:57,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:15:57,637 INFO L82 PathProgramCache]: Analyzing trace with hash 329534762, now seen corresponding path program 12 times [2021-05-02 13:15:57,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:15:57,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538703739] [2021-05-02 13:15:57,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:15:57,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:57,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:15:57,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:57,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2021-05-02 13:15:57,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:57,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45 [2021-05-02 13:15:57,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:57,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2021-05-02 13:15:57,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:57,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 89 [2021-05-02 13:15:57,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:57,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 111 [2021-05-02 13:15:57,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:15:57,875 INFO L134 CoverageAnalysis]: Checked inductivity of 2860 backedges. 915 proven. 105 refuted. 0 times theorem prover too weak. 1840 trivial. 0 not checked. [2021-05-02 13:15:57,875 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:15:57,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538703739] [2021-05-02 13:15:57,875 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538703739] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:15:57,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318548384] [2021-05-02 13:15:57,875 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 13:16:03,325 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 16 check-sat command(s) [2021-05-02 13:16:03,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:03,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 13:16:03,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:03,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:03,516 INFO L134 CoverageAnalysis]: Checked inductivity of 2860 backedges. 1609 proven. 105 refuted. 0 times theorem prover too weak. 1146 trivial. 0 not checked. [2021-05-02 13:16:03,516 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318548384] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:03,516 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:03,516 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2021-05-02 13:16:03,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055517910] [2021-05-02 13:16:03,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 13:16:03,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:03,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 13:16:03,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 13:16:03,517 INFO L87 Difference]: Start difference. First operand 112 states and 123 transitions. Second operand has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:16:04,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:04,120 INFO L93 Difference]: Finished difference Result 223 states and 250 transitions. [2021-05-02 13:16:04,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 13:16:04,121 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 122 [2021-05-02 13:16:04,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:04,122 INFO L225 Difference]: With dead ends: 223 [2021-05-02 13:16:04,122 INFO L226 Difference]: Without dead ends: 118 [2021-05-02 13:16:04,122 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 131 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 572.9ms TimeCoverageRelationStatistics Valid=125, Invalid=997, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:16:04,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-02 13:16:04,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2021-05-02 13:16:04,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 104 states have (on average 1.0769230769230769) internal successors, (112), 105 states have internal predecessors, (112), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:16:04,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 128 transitions. [2021-05-02 13:16:04,137 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 128 transitions. Word has length 122 [2021-05-02 13:16:04,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:04,137 INFO L480 AbstractCegarLoop]: Abstraction has 117 states and 128 transitions. [2021-05-02 13:16:04,137 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.1052631578947367) internal successors, (40), 18 states have internal predecessors, (40), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:16:04,137 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 128 transitions. [2021-05-02 13:16:04,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-05-02 13:16:04,138 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:04,138 INFO L523 BasicCegarLoop]: trace histogram [75, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:04,344 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:04,344 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:04,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:04,345 INFO L82 PathProgramCache]: Analyzing trace with hash 1607123586, now seen corresponding path program 13 times [2021-05-02 13:16:04,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:04,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594362426] [2021-05-02 13:16:04,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:04,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:04,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:04,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:04,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-02 13:16:04,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:04,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 47 [2021-05-02 13:16:04,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:04,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 70 [2021-05-02 13:16:04,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:04,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 93 [2021-05-02 13:16:04,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:04,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 116 [2021-05-02 13:16:04,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:04,614 INFO L134 CoverageAnalysis]: Checked inductivity of 3245 backedges. 1039 proven. 120 refuted. 0 times theorem prover too weak. 2086 trivial. 0 not checked. [2021-05-02 13:16:04,615 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:04,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594362426] [2021-05-02 13:16:04,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594362426] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:04,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86998585] [2021-05-02 13:16:04,615 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 13:16:04,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:04,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 13:16:04,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:04,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:04,845 INFO L134 CoverageAnalysis]: Checked inductivity of 3245 backedges. 1029 proven. 120 refuted. 0 times theorem prover too weak. 2096 trivial. 0 not checked. [2021-05-02 13:16:04,845 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [86998585] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:04,845 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:04,845 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2021-05-02 13:16:04,845 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023330245] [2021-05-02 13:16:04,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 13:16:04,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:04,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 13:16:04,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2021-05-02 13:16:04,846 INFO L87 Difference]: Start difference. First operand 117 states and 128 transitions. Second operand has 20 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:05,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:05,543 INFO L93 Difference]: Finished difference Result 233 states and 260 transitions. [2021-05-02 13:16:05,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 13:16:05,544 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 127 [2021-05-02 13:16:05,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:05,544 INFO L225 Difference]: With dead ends: 233 [2021-05-02 13:16:05,545 INFO L226 Difference]: Without dead ends: 123 [2021-05-02 13:16:05,546 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 174 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 633.5ms TimeCoverageRelationStatistics Valid=133, Invalid=1127, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:16:05,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-05-02 13:16:05,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2021-05-02 13:16:05,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 109 states have (on average 1.073394495412844) internal successors, (117), 110 states have internal predecessors, (117), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:16:05,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 133 transitions. [2021-05-02 13:16:05,561 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 133 transitions. Word has length 127 [2021-05-02 13:16:05,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:05,561 INFO L480 AbstractCegarLoop]: Abstraction has 122 states and 133 transitions. [2021-05-02 13:16:05,561 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.85) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:05,561 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 133 transitions. [2021-05-02 13:16:05,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-05-02 13:16:05,562 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:05,562 INFO L523 BasicCegarLoop]: trace histogram [80, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:05,776 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:05,777 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:05,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:05,777 INFO L82 PathProgramCache]: Analyzing trace with hash 1360675882, now seen corresponding path program 14 times [2021-05-02 13:16:05,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:05,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [106018852] [2021-05-02 13:16:05,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:05,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:06,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:06,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:06,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-02 13:16:06,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:06,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-05-02 13:16:06,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:06,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2021-05-02 13:16:06,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:06,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97 [2021-05-02 13:16:06,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:06,079 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121 [2021-05-02 13:16:06,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:06,081 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 1171 proven. 136 refuted. 0 times theorem prover too weak. 2348 trivial. 0 not checked. [2021-05-02 13:16:06,081 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:06,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [106018852] [2021-05-02 13:16:06,081 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [106018852] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:06,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17158590] [2021-05-02 13:16:06,081 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 13:16:06,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:16:06,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:06,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 13:16:06,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:06,398 INFO L134 CoverageAnalysis]: Checked inductivity of 3655 backedges. 10 proven. 2925 refuted. 0 times theorem prover too weak. 720 trivial. 0 not checked. [2021-05-02 13:16:06,399 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17158590] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:06,399 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:06,399 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 8] total 26 [2021-05-02 13:16:06,399 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623490347] [2021-05-02 13:16:06,401 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:16:06,401 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:06,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:16:06,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=585, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:16:06,402 INFO L87 Difference]: Start difference. First operand 122 states and 133 transitions. Second operand has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 7 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:16:11,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:11,481 INFO L93 Difference]: Finished difference Result 284 states and 318 transitions. [2021-05-02 13:16:11,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-05-02 13:16:11,482 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 7 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 132 [2021-05-02 13:16:11,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:11,483 INFO L225 Difference]: With dead ends: 284 [2021-05-02 13:16:11,483 INFO L226 Difference]: Without dead ends: 169 [2021-05-02 13:16:11,487 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7672 ImplicationChecksByTransitivity, 4089.0ms TimeCoverageRelationStatistics Valid=1191, Invalid=21459, Unknown=0, NotChecked=0, Total=22650 [2021-05-02 13:16:11,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-02 13:16:11,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 148. [2021-05-02 13:16:11,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 134 states have (on average 1.0671641791044777) internal successors, (143), 135 states have internal predecessors, (143), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 13:16:11,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 161 transitions. [2021-05-02 13:16:11,510 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 161 transitions. Word has length 132 [2021-05-02 13:16:11,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:11,510 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 161 transitions. [2021-05-02 13:16:11,510 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 25 states have internal predecessors, (56), 7 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 13:16:11,510 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 161 transitions. [2021-05-02 13:16:11,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-05-02 13:16:11,511 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:11,511 INFO L523 BasicCegarLoop]: trace histogram [102, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:11,730 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-05-02 13:16:11,730 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:11,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:11,731 INFO L82 PathProgramCache]: Analyzing trace with hash 305127648, now seen corresponding path program 15 times [2021-05-02 13:16:11,731 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:11,731 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802075955] [2021-05-02 13:16:11,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:11,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:12,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:12,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:12,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 26 [2021-05-02 13:16:12,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:12,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-02 13:16:12,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:12,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 76 [2021-05-02 13:16:12,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:12,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 101 [2021-05-02 13:16:12,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:12,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 126 [2021-05-02 13:16:12,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:12,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 151 [2021-05-02 13:16:12,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:12,031 INFO L134 CoverageAnalysis]: Checked inductivity of 5901 backedges. 1638 proven. 153 refuted. 0 times theorem prover too weak. 4110 trivial. 0 not checked. [2021-05-02 13:16:12,032 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:12,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802075955] [2021-05-02 13:16:12,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802075955] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:12,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293507988] [2021-05-02 13:16:12,032 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 13:16:14,199 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2021-05-02 13:16:14,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:14,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 13:16:14,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:14,452 INFO L134 CoverageAnalysis]: Checked inductivity of 5901 backedges. 1666 proven. 153 refuted. 0 times theorem prover too weak. 4082 trivial. 0 not checked. [2021-05-02 13:16:14,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293507988] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:14,452 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:14,452 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2021-05-02 13:16:14,452 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88147371] [2021-05-02 13:16:14,453 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 13:16:14,453 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:14,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 13:16:14,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2021-05-02 13:16:14,453 INFO L87 Difference]: Start difference. First operand 148 states and 161 transitions. Second operand has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:16:15,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:15,241 INFO L93 Difference]: Finished difference Result 296 states and 328 transitions. [2021-05-02 13:16:15,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-02 13:16:15,243 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 162 [2021-05-02 13:16:15,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:15,244 INFO L225 Difference]: With dead ends: 296 [2021-05-02 13:16:15,244 INFO L226 Difference]: Without dead ends: 155 [2021-05-02 13:16:15,245 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 172 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 736.2ms TimeCoverageRelationStatistics Valid=149, Invalid=1411, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:16:15,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2021-05-02 13:16:15,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2021-05-02 13:16:15,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 140 states have (on average 1.0642857142857143) internal successors, (149), 141 states have internal predecessors, (149), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 13:16:15,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 167 transitions. [2021-05-02 13:16:15,273 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 167 transitions. Word has length 162 [2021-05-02 13:16:15,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:15,273 INFO L480 AbstractCegarLoop]: Abstraction has 154 states and 167 transitions. [2021-05-02 13:16:15,273 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 22 states have (on average 1.9545454545454546) internal successors, (43), 21 states have internal predecessors, (43), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:16:15,273 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 167 transitions. [2021-05-02 13:16:15,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-05-02 13:16:15,275 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:15,275 INFO L523 BasicCegarLoop]: trace histogram [108, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:15,479 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-05-02 13:16:15,480 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:15,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:15,480 INFO L82 PathProgramCache]: Analyzing trace with hash -423191380, now seen corresponding path program 16 times [2021-05-02 13:16:15,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:15,480 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202655221] [2021-05-02 13:16:15,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:15,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:15,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:15,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:15,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2021-05-02 13:16:15,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:15,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-05-02 13:16:15,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:15,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79 [2021-05-02 13:16:15,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:15,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 105 [2021-05-02 13:16:15,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:15,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 131 [2021-05-02 13:16:15,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:15,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157 [2021-05-02 13:16:15,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:15,805 INFO L134 CoverageAnalysis]: Checked inductivity of 6564 backedges. 1823 proven. 171 refuted. 0 times theorem prover too weak. 4570 trivial. 0 not checked. [2021-05-02 13:16:15,806 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:15,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202655221] [2021-05-02 13:16:15,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1202655221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:15,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [679433171] [2021-05-02 13:16:15,806 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 13:16:15,900 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:16:15,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:15,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 13:16:15,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:15,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:16,090 INFO L134 CoverageAnalysis]: Checked inductivity of 6564 backedges. 1811 proven. 171 refuted. 0 times theorem prover too weak. 4582 trivial. 0 not checked. [2021-05-02 13:16:16,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [679433171] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:16,090 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:16,090 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2021-05-02 13:16:16,091 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837934555] [2021-05-02 13:16:16,091 INFO L460 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-05-02 13:16:16,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:16,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-05-02 13:16:16,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2021-05-02 13:16:16,092 INFO L87 Difference]: Start difference. First operand 154 states and 167 transitions. Second operand has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 22 states have internal predecessors, (40), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:16,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:16,884 INFO L93 Difference]: Finished difference Result 308 states and 340 transitions. [2021-05-02 13:16:16,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 13:16:16,884 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 22 states have internal predecessors, (40), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 168 [2021-05-02 13:16:16,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:16,885 INFO L225 Difference]: With dead ends: 308 [2021-05-02 13:16:16,885 INFO L226 Difference]: Without dead ends: 161 [2021-05-02 13:16:16,886 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 182 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 801.1ms TimeCoverageRelationStatistics Valid=157, Invalid=1565, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 13:16:16,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2021-05-02 13:16:16,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 160. [2021-05-02 13:16:16,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 146 states have (on average 1.0616438356164384) internal successors, (155), 147 states have internal predecessors, (155), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 13:16:16,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 173 transitions. [2021-05-02 13:16:16,904 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 173 transitions. Word has length 168 [2021-05-02 13:16:16,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:16,905 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 173 transitions. [2021-05-02 13:16:16,905 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 23 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 22 states have internal predecessors, (40), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:16:16,905 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 173 transitions. [2021-05-02 13:16:16,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-05-02 13:16:16,906 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:16,906 INFO L523 BasicCegarLoop]: trace histogram [114, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:17,116 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-02 13:16:17,117 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:17,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:17,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1389986400, now seen corresponding path program 17 times [2021-05-02 13:16:17,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:17,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652581508] [2021-05-02 13:16:17,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:17,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:17,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:17,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:17,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2021-05-02 13:16:17,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:17,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 55 [2021-05-02 13:16:17,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:17,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 82 [2021-05-02 13:16:17,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:17,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109 [2021-05-02 13:16:17,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:17,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 136 [2021-05-02 13:16:17,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:17,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 163 [2021-05-02 13:16:17,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:17,487 INFO L134 CoverageAnalysis]: Checked inductivity of 7263 backedges. 2018 proven. 190 refuted. 0 times theorem prover too weak. 5055 trivial. 0 not checked. [2021-05-02 13:16:17,487 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:17,487 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652581508] [2021-05-02 13:16:17,487 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652581508] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:17,487 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62334765] [2021-05-02 13:16:17,487 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:16:35,265 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2021-05-02 13:16:35,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:16:35,276 WARN L261 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 130 conjunts are in the unsatisfiable core [2021-05-02 13:16:35,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:16:35,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:16:35,684 INFO L134 CoverageAnalysis]: Checked inductivity of 7263 backedges. 3642 proven. 190 refuted. 0 times theorem prover too weak. 3431 trivial. 0 not checked. [2021-05-02 13:16:35,684 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [62334765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:35,684 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:16:35,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2021-05-02 13:16:35,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214312870] [2021-05-02 13:16:35,685 INFO L460 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-05-02 13:16:35,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:16:35,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-05-02 13:16:35,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2021-05-02 13:16:35,686 INFO L87 Difference]: Start difference. First operand 160 states and 173 transitions. Second operand has 24 states, 24 states have (on average 1.875) internal successors, (45), 23 states have internal predecessors, (45), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:16:36,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:16:36,482 INFO L93 Difference]: Finished difference Result 320 states and 352 transitions. [2021-05-02 13:16:36,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-02 13:16:36,483 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 23 states have internal predecessors, (45), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 174 [2021-05-02 13:16:36,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:16:36,483 INFO L225 Difference]: With dead ends: 320 [2021-05-02 13:16:36,484 INFO L226 Difference]: Without dead ends: 167 [2021-05-02 13:16:36,484 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 171 SyntacticMatches, 17 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 969.6ms TimeCoverageRelationStatistics Valid=165, Invalid=1727, Unknown=0, NotChecked=0, Total=1892 [2021-05-02 13:16:36,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2021-05-02 13:16:36,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2021-05-02 13:16:36,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 152 states have (on average 1.0592105263157894) internal successors, (161), 153 states have internal predecessors, (161), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 13:16:36,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 179 transitions. [2021-05-02 13:16:36,500 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 179 transitions. Word has length 174 [2021-05-02 13:16:36,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:16:36,500 INFO L480 AbstractCegarLoop]: Abstraction has 166 states and 179 transitions. [2021-05-02 13:16:36,500 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 24 states, 24 states have (on average 1.875) internal successors, (45), 23 states have internal predecessors, (45), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:16:36,500 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 179 transitions. [2021-05-02 13:16:36,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-05-02 13:16:36,501 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:16:36,501 INFO L523 BasicCegarLoop]: trace histogram [120, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:16:36,706 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 13:16:36,707 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:16:36,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:16:36,707 INFO L82 PathProgramCache]: Analyzing trace with hash 606000428, now seen corresponding path program 18 times [2021-05-02 13:16:36,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:16:36,707 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [153848407] [2021-05-02 13:16:36,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:16:36,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:37,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:16:37,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:37,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-02 13:16:37,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:37,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-02 13:16:37,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:37,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 85 [2021-05-02 13:16:37,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:37,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 113 [2021-05-02 13:16:37,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:37,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 141 [2021-05-02 13:16:37,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:37,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 169 [2021-05-02 13:16:37,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:16:37,124 INFO L134 CoverageAnalysis]: Checked inductivity of 7998 backedges. 2223 proven. 210 refuted. 0 times theorem prover too weak. 5565 trivial. 0 not checked. [2021-05-02 13:16:37,125 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:16:37,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [153848407] [2021-05-02 13:16:37,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [153848407] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:16:37,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [677788759] [2021-05-02 13:16:37,125 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 13:17:10,593 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 22 check-sat command(s) [2021-05-02 13:17:10,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:10,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 400 conjuncts, 123 conjunts are in the unsatisfiable core [2021-05-02 13:17:10,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:10,877 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:10,987 INFO L134 CoverageAnalysis]: Checked inductivity of 7998 backedges. 4011 proven. 210 refuted. 0 times theorem prover too weak. 3777 trivial. 0 not checked. [2021-05-02 13:17:10,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [677788759] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:10,988 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:10,988 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2021-05-02 13:17:10,988 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653158191] [2021-05-02 13:17:10,988 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-02 13:17:10,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:10,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-02 13:17:10,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2021-05-02 13:17:10,989 INFO L87 Difference]: Start difference. First operand 166 states and 179 transitions. Second operand has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:17:11,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:11,830 INFO L93 Difference]: Finished difference Result 332 states and 364 transitions. [2021-05-02 13:17:11,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-02 13:17:11,830 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 180 [2021-05-02 13:17:11,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:11,831 INFO L225 Difference]: With dead ends: 332 [2021-05-02 13:17:11,831 INFO L226 Difference]: Without dead ends: 173 [2021-05-02 13:17:11,832 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 181 SyntacticMatches, 13 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 1012.3ms TimeCoverageRelationStatistics Valid=173, Invalid=1897, Unknown=0, NotChecked=0, Total=2070 [2021-05-02 13:17:11,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-05-02 13:17:11,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 172. [2021-05-02 13:17:11,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 158 states have (on average 1.0569620253164558) internal successors, (167), 159 states have internal predecessors, (167), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 13:17:11,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 185 transitions. [2021-05-02 13:17:11,851 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 185 transitions. Word has length 180 [2021-05-02 13:17:11,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:11,851 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 185 transitions. [2021-05-02 13:17:11,851 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 25 states have (on average 1.84) internal successors, (46), 24 states have internal predecessors, (46), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:17:11,851 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 185 transitions. [2021-05-02 13:17:11,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2021-05-02 13:17:11,852 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:11,852 INFO L523 BasicCegarLoop]: trace histogram [126, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:12,059 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 13:17:12,059 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:12,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:12,060 INFO L82 PathProgramCache]: Analyzing trace with hash -1340783648, now seen corresponding path program 19 times [2021-05-02 13:17:12,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:12,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681783093] [2021-05-02 13:17:12,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:12,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:12,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:12,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:12,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-02 13:17:12,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:12,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-02 13:17:12,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:12,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 88 [2021-05-02 13:17:12,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:12,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 117 [2021-05-02 13:17:12,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:12,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 146 [2021-05-02 13:17:12,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:12,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 175 [2021-05-02 13:17:12,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:12,476 INFO L134 CoverageAnalysis]: Checked inductivity of 8769 backedges. 2438 proven. 231 refuted. 0 times theorem prover too weak. 6100 trivial. 0 not checked. [2021-05-02 13:17:12,477 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:12,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681783093] [2021-05-02 13:17:12,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [681783093] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:12,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [598701247] [2021-05-02 13:17:12,477 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 13:17:12,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:12,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 13:17:12,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:12,665 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:12,783 INFO L134 CoverageAnalysis]: Checked inductivity of 8769 backedges. 2426 proven. 231 refuted. 0 times theorem prover too weak. 6112 trivial. 0 not checked. [2021-05-02 13:17:12,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [598701247] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:12,784 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:12,784 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2021-05-02 13:17:12,784 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934000741] [2021-05-02 13:17:12,784 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 13:17:12,784 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:12,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 13:17:12,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2021-05-02 13:17:12,785 INFO L87 Difference]: Start difference. First operand 172 states and 185 transitions. Second operand has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:17:13,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:13,642 INFO L93 Difference]: Finished difference Result 344 states and 376 transitions. [2021-05-02 13:17:13,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-02 13:17:13,642 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 186 [2021-05-02 13:17:13,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:13,643 INFO L225 Difference]: With dead ends: 344 [2021-05-02 13:17:13,643 INFO L226 Difference]: Without dead ends: 179 [2021-05-02 13:17:13,644 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 200 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 235 ImplicationChecksByTransitivity, 916.9ms TimeCoverageRelationStatistics Valid=181, Invalid=2075, Unknown=0, NotChecked=0, Total=2256 [2021-05-02 13:17:13,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-05-02 13:17:13,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 178. [2021-05-02 13:17:13,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 164 states have (on average 1.0548780487804879) internal successors, (173), 165 states have internal predecessors, (173), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 13:17:13,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 191 transitions. [2021-05-02 13:17:13,666 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 191 transitions. Word has length 186 [2021-05-02 13:17:13,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:13,666 INFO L480 AbstractCegarLoop]: Abstraction has 178 states and 191 transitions. [2021-05-02 13:17:13,666 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 26 states have (on average 1.6538461538461537) internal successors, (43), 25 states have internal predecessors, (43), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:17:13,666 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 191 transitions. [2021-05-02 13:17:13,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-05-02 13:17:13,668 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:13,668 INFO L523 BasicCegarLoop]: trace histogram [132, 7, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:13,877 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:13,877 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:13,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:13,877 INFO L82 PathProgramCache]: Analyzing trace with hash -1978798676, now seen corresponding path program 20 times [2021-05-02 13:17:13,877 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:13,877 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785190146] [2021-05-02 13:17:13,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:13,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:14,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:14,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:14,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2021-05-02 13:17:14,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:14,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-05-02 13:17:14,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:14,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 91 [2021-05-02 13:17:14,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:14,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121 [2021-05-02 13:17:14,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:14,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 151 [2021-05-02 13:17:14,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:14,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 181 [2021-05-02 13:17:14,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:14,314 INFO L134 CoverageAnalysis]: Checked inductivity of 9576 backedges. 2663 proven. 253 refuted. 0 times theorem prover too weak. 6660 trivial. 0 not checked. [2021-05-02 13:17:14,315 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:14,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785190146] [2021-05-02 13:17:14,316 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [785190146] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:14,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634661183] [2021-05-02 13:17:14,316 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 13:17:14,435 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:17:14,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:14,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 580 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 13:17:14,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:14,800 INFO L134 CoverageAnalysis]: Checked inductivity of 9576 backedges. 12 proven. 7986 refuted. 0 times theorem prover too weak. 1578 trivial. 0 not checked. [2021-05-02 13:17:14,800 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [634661183] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:14,801 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:14,801 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 9] total 33 [2021-05-02 13:17:14,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129702743] [2021-05-02 13:17:14,801 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-02 13:17:14,801 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:14,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-02 13:17:14,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=971, Unknown=0, NotChecked=0, Total=1056 [2021-05-02 13:17:14,802 INFO L87 Difference]: Start difference. First operand 178 states and 191 transitions. Second operand has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 8 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 13:17:23,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:23,085 INFO L93 Difference]: Finished difference Result 409 states and 448 transitions. [2021-05-02 13:17:23,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 194 states. [2021-05-02 13:17:23,085 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 8 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Word has length 192 [2021-05-02 13:17:23,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:23,086 INFO L225 Difference]: With dead ends: 409 [2021-05-02 13:17:23,086 INFO L226 Difference]: Without dead ends: 238 [2021-05-02 13:17:23,089 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 202 SyntacticMatches, 0 SemanticMatches, 222 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18015 ImplicationChecksByTransitivity, 6609.1ms TimeCoverageRelationStatistics Valid=1838, Invalid=48114, Unknown=0, NotChecked=0, Total=49952 [2021-05-02 13:17:23,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-05-02 13:17:23,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 211. [2021-05-02 13:17:23,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 196 states have (on average 1.0510204081632653) internal successors, (206), 197 states have internal predecessors, (206), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 13:17:23,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 226 transitions. [2021-05-02 13:17:23,110 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 226 transitions. Word has length 192 [2021-05-02 13:17:23,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:23,110 INFO L480 AbstractCegarLoop]: Abstraction has 211 states and 226 transitions. [2021-05-02 13:17:23,110 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 33 states have (on average 2.0) internal successors, (66), 32 states have internal predecessors, (66), 8 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 13:17:23,111 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 226 transitions. [2021-05-02 13:17:23,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-05-02 13:17:23,111 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:23,111 INFO L523 BasicCegarLoop]: trace histogram [161, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:23,324 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 13:17:23,325 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:23,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:23,325 INFO L82 PathProgramCache]: Analyzing trace with hash -627182910, now seen corresponding path program 21 times [2021-05-02 13:17:23,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:23,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451642437] [2021-05-02 13:17:23,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:23,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:23,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:23,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:23,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2021-05-02 13:17:23,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:23,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-05-02 13:17:23,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:23,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 94 [2021-05-02 13:17:23,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:23,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 125 [2021-05-02 13:17:23,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:23,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 156 [2021-05-02 13:17:23,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:23,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 187 [2021-05-02 13:17:23,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:23,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 218 [2021-05-02 13:17:23,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:23,797 INFO L134 CoverageAnalysis]: Checked inductivity of 14196 backedges. 3477 proven. 276 refuted. 0 times theorem prover too weak. 10443 trivial. 0 not checked. [2021-05-02 13:17:23,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:23,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451642437] [2021-05-02 13:17:23,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1451642437] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:23,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [388189560] [2021-05-02 13:17:23,797 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 13:17:25,690 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2021-05-02 13:17:25,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:25,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 13:17:25,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:25,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:25,972 INFO L134 CoverageAnalysis]: Checked inductivity of 14196 backedges. 3511 proven. 276 refuted. 0 times theorem prover too weak. 10409 trivial. 0 not checked. [2021-05-02 13:17:25,972 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [388189560] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:25,972 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:25,972 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26] total 28 [2021-05-02 13:17:25,972 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443368009] [2021-05-02 13:17:25,972 INFO L460 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-05-02 13:17:25,972 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:25,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-05-02 13:17:25,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2021-05-02 13:17:25,973 INFO L87 Difference]: Start difference. First operand 211 states and 226 transitions. Second operand has 28 states, 28 states have (on average 1.75) internal successors, (49), 27 states have internal predecessors, (49), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:17:27,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:27,005 INFO L93 Difference]: Finished difference Result 423 states and 460 transitions. [2021-05-02 13:17:27,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 13:17:27,005 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 27 states have internal predecessors, (49), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 229 [2021-05-02 13:17:27,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:27,006 INFO L225 Difference]: With dead ends: 423 [2021-05-02 13:17:27,006 INFO L226 Difference]: Without dead ends: 219 [2021-05-02 13:17:27,006 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 244 SyntacticMatches, 1 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 1029.9ms TimeCoverageRelationStatistics Valid=197, Invalid=2455, Unknown=0, NotChecked=0, Total=2652 [2021-05-02 13:17:27,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2021-05-02 13:17:27,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 218. [2021-05-02 13:17:27,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 203 states have (on average 1.0492610837438423) internal successors, (213), 204 states have internal predecessors, (213), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 13:17:27,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 233 transitions. [2021-05-02 13:17:27,030 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 233 transitions. Word has length 229 [2021-05-02 13:17:27,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:27,030 INFO L480 AbstractCegarLoop]: Abstraction has 218 states and 233 transitions. [2021-05-02 13:17:27,030 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 28 states, 28 states have (on average 1.75) internal successors, (49), 27 states have internal predecessors, (49), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:17:27,030 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 233 transitions. [2021-05-02 13:17:27,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2021-05-02 13:17:27,031 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:27,031 INFO L523 BasicCegarLoop]: trace histogram [168, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:27,231 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:17:27,231 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:27,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:27,232 INFO L82 PathProgramCache]: Analyzing trace with hash 200123438, now seen corresponding path program 22 times [2021-05-02 13:17:27,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:27,232 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626687286] [2021-05-02 13:17:27,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:27,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:27,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:27,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:27,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2021-05-02 13:17:27,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:27,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 65 [2021-05-02 13:17:27,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:27,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 97 [2021-05-02 13:17:27,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:27,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 129 [2021-05-02 13:17:27,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:27,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 161 [2021-05-02 13:17:27,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:27,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 193 [2021-05-02 13:17:27,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:27,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 225 [2021-05-02 13:17:27,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:27,741 INFO L134 CoverageAnalysis]: Checked inductivity of 15393 backedges. 3771 proven. 300 refuted. 0 times theorem prover too weak. 11322 trivial. 0 not checked. [2021-05-02 13:17:27,741 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:27,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626687286] [2021-05-02 13:17:27,741 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626687286] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:27,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [164064922] [2021-05-02 13:17:27,741 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 13:17:27,849 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:17:27,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:17:27,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 13:17:27,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:17:27,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:17:28,098 INFO L134 CoverageAnalysis]: Checked inductivity of 15393 backedges. 3757 proven. 300 refuted. 0 times theorem prover too weak. 11336 trivial. 0 not checked. [2021-05-02 13:17:28,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [164064922] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:28,099 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:17:28,099 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2021-05-02 13:17:28,099 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107179580] [2021-05-02 13:17:28,099 INFO L460 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-05-02 13:17:28,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:17:28,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-05-02 13:17:28,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2021-05-02 13:17:28,100 INFO L87 Difference]: Start difference. First operand 218 states and 233 transitions. Second operand has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 28 states have internal predecessors, (46), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:17:29,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:17:29,172 INFO L93 Difference]: Finished difference Result 437 states and 474 transitions. [2021-05-02 13:17:29,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-02 13:17:29,172 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 28 states have internal predecessors, (46), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 236 [2021-05-02 13:17:29,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:17:29,173 INFO L225 Difference]: With dead ends: 437 [2021-05-02 13:17:29,173 INFO L226 Difference]: Without dead ends: 226 [2021-05-02 13:17:29,174 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 305 GetRequests, 252 SyntacticMatches, 1 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 1096.5ms TimeCoverageRelationStatistics Valid=205, Invalid=2657, Unknown=0, NotChecked=0, Total=2862 [2021-05-02 13:17:29,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-05-02 13:17:29,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 225. [2021-05-02 13:17:29,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 210 states have (on average 1.0476190476190477) internal successors, (220), 211 states have internal predecessors, (220), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 13:17:29,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 240 transitions. [2021-05-02 13:17:29,197 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 240 transitions. Word has length 236 [2021-05-02 13:17:29,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:17:29,197 INFO L480 AbstractCegarLoop]: Abstraction has 225 states and 240 transitions. [2021-05-02 13:17:29,197 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 29 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 28 states have internal predecessors, (46), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:17:29,197 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 240 transitions. [2021-05-02 13:17:29,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 244 [2021-05-02 13:17:29,198 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:17:29,198 INFO L523 BasicCegarLoop]: trace histogram [175, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:17:29,412 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-05-02 13:17:29,412 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:17:29,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:17:29,412 INFO L82 PathProgramCache]: Analyzing trace with hash -76532414, now seen corresponding path program 23 times [2021-05-02 13:17:29,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:17:29,412 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889853719] [2021-05-02 13:17:29,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:17:29,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:29,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:17:29,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:29,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2021-05-02 13:17:29,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:29,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 67 [2021-05-02 13:17:29,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:29,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 100 [2021-05-02 13:17:29,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:29,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 133 [2021-05-02 13:17:29,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:29,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 166 [2021-05-02 13:17:29,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:29,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 199 [2021-05-02 13:17:29,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:29,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 232 [2021-05-02 13:17:29,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:17:29,879 INFO L134 CoverageAnalysis]: Checked inductivity of 16639 backedges. 4077 proven. 325 refuted. 0 times theorem prover too weak. 12237 trivial. 0 not checked. [2021-05-02 13:17:29,880 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:17:29,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889853719] [2021-05-02 13:17:29,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889853719] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:17:29,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1103645800] [2021-05-02 13:17:29,880 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:18:24,547 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 14 check-sat command(s) [2021-05-02 13:18:24,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:18:24,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 141 conjunts are in the unsatisfiable core [2021-05-02 13:18:24,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:18:24,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:18:25,003 INFO L134 CoverageAnalysis]: Checked inductivity of 16639 backedges. 7486 proven. 325 refuted. 0 times theorem prover too weak. 8828 trivial. 0 not checked. [2021-05-02 13:18:25,003 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1103645800] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:25,003 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:18:25,004 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2021-05-02 13:18:25,004 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628757855] [2021-05-02 13:18:25,004 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 13:18:25,004 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:18:25,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 13:18:25,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2021-05-02 13:18:25,008 INFO L87 Difference]: Start difference. First operand 225 states and 240 transitions. Second operand has 30 states, 30 states have (on average 1.7) internal successors, (51), 29 states have internal predecessors, (51), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:18:26,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:18:26,207 INFO L93 Difference]: Finished difference Result 451 states and 488 transitions. [2021-05-02 13:18:26,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-05-02 13:18:26,207 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.7) internal successors, (51), 29 states have internal predecessors, (51), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 243 [2021-05-02 13:18:26,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:18:26,208 INFO L225 Difference]: With dead ends: 451 [2021-05-02 13:18:26,208 INFO L226 Difference]: Without dead ends: 233 [2021-05-02 13:18:26,209 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 313 GetRequests, 245 SyntacticMatches, 14 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1281.8ms TimeCoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-05-02 13:18:26,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2021-05-02 13:18:26,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 232. [2021-05-02 13:18:26,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 217 states have (on average 1.0460829493087558) internal successors, (227), 218 states have internal predecessors, (227), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 13:18:26,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 247 transitions. [2021-05-02 13:18:26,233 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 247 transitions. Word has length 243 [2021-05-02 13:18:26,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:18:26,233 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 247 transitions. [2021-05-02 13:18:26,233 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 30 states have (on average 1.7) internal successors, (51), 29 states have internal predecessors, (51), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:18:26,233 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 247 transitions. [2021-05-02 13:18:26,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2021-05-02 13:18:26,234 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:18:26,234 INFO L523 BasicCegarLoop]: trace histogram [182, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:18:26,434 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:18:26,434 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:18:26,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:18:26,435 INFO L82 PathProgramCache]: Analyzing trace with hash -1558592082, now seen corresponding path program 24 times [2021-05-02 13:18:26,435 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:18:26,435 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456822771] [2021-05-02 13:18:26,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:18:26,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:26,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:18:26,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:26,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-05-02 13:18:26,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:26,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69 [2021-05-02 13:18:26,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:26,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 103 [2021-05-02 13:18:26,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:26,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 137 [2021-05-02 13:18:26,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:26,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 171 [2021-05-02 13:18:26,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:26,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 205 [2021-05-02 13:18:26,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:26,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 239 [2021-05-02 13:18:26,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:18:26,937 INFO L134 CoverageAnalysis]: Checked inductivity of 17934 backedges. 4395 proven. 351 refuted. 0 times theorem prover too weak. 13188 trivial. 0 not checked. [2021-05-02 13:18:26,937 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:18:26,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456822771] [2021-05-02 13:18:26,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456822771] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:18:26,937 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391496344] [2021-05-02 13:18:26,937 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 13:20:49,782 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2021-05-02 13:20:49,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:20:49,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 550 conjuncts, 55 conjunts are in the unsatisfiable core [2021-05-02 13:20:49,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:20:49,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:20:50,088 INFO L134 CoverageAnalysis]: Checked inductivity of 17934 backedges. 8069 proven. 351 refuted. 0 times theorem prover too weak. 9514 trivial. 0 not checked. [2021-05-02 13:20:50,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1391496344] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:50,088 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:20:50,088 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2021-05-02 13:20:50,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024417426] [2021-05-02 13:20:50,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 31 states [2021-05-02 13:20:50,089 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:20:50,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-05-02 13:20:50,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2021-05-02 13:20:50,089 INFO L87 Difference]: Start difference. First operand 232 states and 247 transitions. Second operand has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 30 states have internal predecessors, (52), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:20:51,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:20:51,329 INFO L93 Difference]: Finished difference Result 465 states and 502 transitions. [2021-05-02 13:20:51,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-02 13:20:51,329 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 30 states have internal predecessors, (52), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 250 [2021-05-02 13:20:51,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:20:51,330 INFO L225 Difference]: With dead ends: 465 [2021-05-02 13:20:51,330 INFO L226 Difference]: Without dead ends: 240 [2021-05-02 13:20:51,331 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 265 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 1174.5ms TimeCoverageRelationStatistics Valid=221, Invalid=3085, Unknown=0, NotChecked=0, Total=3306 [2021-05-02 13:20:51,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2021-05-02 13:20:51,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 239. [2021-05-02 13:20:51,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 224 states have (on average 1.0446428571428572) internal successors, (234), 225 states have internal predecessors, (234), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 13:20:51,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 254 transitions. [2021-05-02 13:20:51,356 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 254 transitions. Word has length 250 [2021-05-02 13:20:51,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:20:51,356 INFO L480 AbstractCegarLoop]: Abstraction has 239 states and 254 transitions. [2021-05-02 13:20:51,356 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 30 states have internal predecessors, (52), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:20:51,356 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 254 transitions. [2021-05-02 13:20:51,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 258 [2021-05-02 13:20:51,357 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:20:51,357 INFO L523 BasicCegarLoop]: trace histogram [189, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:20:51,570 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable30 [2021-05-02 13:20:51,571 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:20:51,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:20:51,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1410078658, now seen corresponding path program 25 times [2021-05-02 13:20:51,571 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:20:51,571 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138474751] [2021-05-02 13:20:51,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:20:51,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:52,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:20:52,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:52,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2021-05-02 13:20:52,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:52,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 71 [2021-05-02 13:20:52,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:52,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 106 [2021-05-02 13:20:52,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:52,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 141 [2021-05-02 13:20:52,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:52,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 176 [2021-05-02 13:20:52,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:52,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 211 [2021-05-02 13:20:52,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:52,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 246 [2021-05-02 13:20:52,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:52,102 INFO L134 CoverageAnalysis]: Checked inductivity of 19278 backedges. 4725 proven. 378 refuted. 0 times theorem prover too weak. 14175 trivial. 0 not checked. [2021-05-02 13:20:52,102 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:20:52,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138474751] [2021-05-02 13:20:52,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138474751] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:52,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [740864077] [2021-05-02 13:20:52,102 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 13:20:52,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:52,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 766 conjuncts, 57 conjunts are in the unsatisfiable core [2021-05-02 13:20:52,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:20:52,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:20:52,465 INFO L134 CoverageAnalysis]: Checked inductivity of 19278 backedges. 4711 proven. 378 refuted. 0 times theorem prover too weak. 14189 trivial. 0 not checked. [2021-05-02 13:20:52,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [740864077] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:52,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:20:52,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30] total 32 [2021-05-02 13:20:52,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150094664] [2021-05-02 13:20:52,466 INFO L460 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-05-02 13:20:52,466 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:20:52,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-05-02 13:20:52,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2021-05-02 13:20:52,466 INFO L87 Difference]: Start difference. First operand 239 states and 254 transitions. Second operand has 32 states, 32 states have (on average 1.53125) internal successors, (49), 31 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:20:53,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:20:53,716 INFO L93 Difference]: Finished difference Result 479 states and 516 transitions. [2021-05-02 13:20:53,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-05-02 13:20:53,716 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.53125) internal successors, (49), 31 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 257 [2021-05-02 13:20:53,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:20:53,717 INFO L225 Difference]: With dead ends: 479 [2021-05-02 13:20:53,717 INFO L226 Difference]: Without dead ends: 247 [2021-05-02 13:20:53,718 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 273 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 382 ImplicationChecksByTransitivity, 1239.8ms TimeCoverageRelationStatistics Valid=229, Invalid=3311, Unknown=0, NotChecked=0, Total=3540 [2021-05-02 13:20:53,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2021-05-02 13:20:53,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 246. [2021-05-02 13:20:53,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 231 states have (on average 1.0432900432900434) internal successors, (241), 232 states have internal predecessors, (241), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 13:20:53,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 261 transitions. [2021-05-02 13:20:53,742 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 261 transitions. Word has length 257 [2021-05-02 13:20:53,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:20:53,742 INFO L480 AbstractCegarLoop]: Abstraction has 246 states and 261 transitions. [2021-05-02 13:20:53,742 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 32 states, 32 states have (on average 1.53125) internal successors, (49), 31 states have internal predecessors, (49), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:20:53,742 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 261 transitions. [2021-05-02 13:20:53,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2021-05-02 13:20:53,743 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:20:53,743 INFO L523 BasicCegarLoop]: trace histogram [196, 8, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:20:53,954 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:20:53,954 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:20:53,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:20:53,954 INFO L82 PathProgramCache]: Analyzing trace with hash 1963345710, now seen corresponding path program 26 times [2021-05-02 13:20:53,954 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:20:53,954 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298545164] [2021-05-02 13:20:53,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:20:54,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:54,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:20:54,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:54,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-02 13:20:54,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:54,528 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 73 [2021-05-02 13:20:54,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:54,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 109 [2021-05-02 13:20:54,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:54,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 145 [2021-05-02 13:20:54,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:54,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 181 [2021-05-02 13:20:54,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:54,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 217 [2021-05-02 13:20:54,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:54,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 253 [2021-05-02 13:20:54,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:20:54,533 INFO L134 CoverageAnalysis]: Checked inductivity of 20671 backedges. 5067 proven. 406 refuted. 0 times theorem prover too weak. 15198 trivial. 0 not checked. [2021-05-02 13:20:54,534 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:20:54,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298545164] [2021-05-02 13:20:54,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298545164] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:54,534 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435001783] [2021-05-02 13:20:54,534 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 13:20:54,656 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:20:54,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:20:54,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 787 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:20:54,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:20:55,142 INFO L134 CoverageAnalysis]: Checked inductivity of 20671 backedges. 14 proven. 17731 refuted. 0 times theorem prover too weak. 2926 trivial. 0 not checked. [2021-05-02 13:20:55,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435001783] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:20:55,142 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:20:55,143 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 10] total 40 [2021-05-02 13:20:55,143 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737408392] [2021-05-02 13:20:55,143 INFO L460 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-05-02 13:20:55,143 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:20:55,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-05-02 13:20:55,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1455, Unknown=0, NotChecked=0, Total=1560 [2021-05-02 13:20:55,153 INFO L87 Difference]: Start difference. First operand 246 states and 261 transitions. Second operand has 40 states, 40 states have (on average 1.9) internal successors, (76), 39 states have internal predecessors, (76), 9 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 13:21:07,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:21:07,694 INFO L93 Difference]: Finished difference Result 558 states and 602 transitions. [2021-05-02 13:21:07,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 272 states. [2021-05-02 13:21:07,694 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.9) internal successors, (76), 39 states have internal predecessors, (76), 9 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 264 [2021-05-02 13:21:07,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:21:07,695 INFO L225 Difference]: With dead ends: 558 [2021-05-02 13:21:07,695 INFO L226 Difference]: Without dead ends: 319 [2021-05-02 13:21:07,699 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 582 GetRequests, 275 SyntacticMatches, 0 SemanticMatches, 307 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35852 ImplicationChecksByTransitivity, 9937.0ms TimeCoverageRelationStatistics Valid=2605, Invalid=92567, Unknown=0, NotChecked=0, Total=95172 [2021-05-02 13:21:07,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2021-05-02 13:21:07,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 286. [2021-05-02 13:21:07,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 270 states have (on average 1.0407407407407407) internal successors, (281), 271 states have internal predecessors, (281), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 13:21:07,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 303 transitions. [2021-05-02 13:21:07,729 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 303 transitions. Word has length 264 [2021-05-02 13:21:07,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:21:07,729 INFO L480 AbstractCegarLoop]: Abstraction has 286 states and 303 transitions. [2021-05-02 13:21:07,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 40 states, 40 states have (on average 1.9) internal successors, (76), 39 states have internal predecessors, (76), 9 states have call successors, (12), 3 states have call predecessors, (12), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 13:21:07,729 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 303 transitions. [2021-05-02 13:21:07,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 309 [2021-05-02 13:21:07,730 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:21:07,730 INFO L523 BasicCegarLoop]: trace histogram [232, 9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:21:07,930 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 13:21:07,931 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:21:07,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:21:07,931 INFO L82 PathProgramCache]: Analyzing trace with hash -255623392, now seen corresponding path program 27 times [2021-05-02 13:21:07,931 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:21:07,931 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398081287] [2021-05-02 13:21:07,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:21:07,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:08,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:21:08,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:08,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 38 [2021-05-02 13:21:08,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:08,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 75 [2021-05-02 13:21:08,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:08,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 112 [2021-05-02 13:21:08,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:08,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 149 [2021-05-02 13:21:08,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:08,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 186 [2021-05-02 13:21:08,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:08,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 223 [2021-05-02 13:21:08,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:08,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 260 [2021-05-02 13:21:08,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:08,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 297 [2021-05-02 13:21:08,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:08,517 INFO L134 CoverageAnalysis]: Checked inductivity of 28900 backedges. 6324 proven. 435 refuted. 0 times theorem prover too weak. 22141 trivial. 0 not checked. [2021-05-02 13:21:08,517 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:21:08,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398081287] [2021-05-02 13:21:08,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398081287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:21:08,517 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293293245] [2021-05-02 13:21:08,518 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 13:21:10,651 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2021-05-02 13:21:10,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:21:10,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 61 conjunts are in the unsatisfiable core [2021-05-02 13:21:10,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:21:11,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:21:11,048 INFO L134 CoverageAnalysis]: Checked inductivity of 28900 backedges. 6364 proven. 435 refuted. 0 times theorem prover too weak. 22101 trivial. 0 not checked. [2021-05-02 13:21:11,048 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293293245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:21:11,049 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:21:11,049 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32] total 34 [2021-05-02 13:21:11,049 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417546762] [2021-05-02 13:21:11,049 INFO L460 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-05-02 13:21:11,049 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:21:11,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-05-02 13:21:11,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 13:21:11,050 INFO L87 Difference]: Start difference. First operand 286 states and 303 transitions. Second operand has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 33 states have internal predecessors, (55), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:21:12,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:21:12,519 INFO L93 Difference]: Finished difference Result 574 states and 616 transitions. [2021-05-02 13:21:12,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-05-02 13:21:12,521 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 33 states have internal predecessors, (55), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 308 [2021-05-02 13:21:12,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:21:12,522 INFO L225 Difference]: With dead ends: 574 [2021-05-02 13:21:12,522 INFO L226 Difference]: Without dead ends: 295 [2021-05-02 13:21:12,522 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 325 SyntacticMatches, 1 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 1372.7ms TimeCoverageRelationStatistics Valid=245, Invalid=3787, Unknown=0, NotChecked=0, Total=4032 [2021-05-02 13:21:12,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2021-05-02 13:21:12,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 294. [2021-05-02 13:21:12,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 294 states, 278 states have (on average 1.039568345323741) internal successors, (289), 279 states have internal predecessors, (289), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 13:21:12,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 311 transitions. [2021-05-02 13:21:12,564 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 311 transitions. Word has length 308 [2021-05-02 13:21:12,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:21:12,564 INFO L480 AbstractCegarLoop]: Abstraction has 294 states and 311 transitions. [2021-05-02 13:21:12,564 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 33 states have internal predecessors, (55), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:21:12,564 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 311 transitions. [2021-05-02 13:21:12,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2021-05-02 13:21:12,565 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:21:12,565 INFO L523 BasicCegarLoop]: trace histogram [240, 9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:21:12,769 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:21:12,769 INFO L428 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:21:12,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:21:12,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1164865584, now seen corresponding path program 28 times [2021-05-02 13:21:12,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:21:12,769 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1097680605] [2021-05-02 13:21:12,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:21:12,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:13,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:21:13,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:13,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-02 13:21:13,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:13,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 77 [2021-05-02 13:21:13,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:13,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 115 [2021-05-02 13:21:13,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:13,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 153 [2021-05-02 13:21:13,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:13,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 191 [2021-05-02 13:21:13,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:13,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 229 [2021-05-02 13:21:13,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:13,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 267 [2021-05-02 13:21:13,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:13,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 305 [2021-05-02 13:21:13,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:13,384 INFO L134 CoverageAnalysis]: Checked inductivity of 30848 backedges. 6751 proven. 465 refuted. 0 times theorem prover too weak. 23632 trivial. 0 not checked. [2021-05-02 13:21:13,384 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:21:13,384 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1097680605] [2021-05-02 13:21:13,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1097680605] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:21:13,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309517949] [2021-05-02 13:21:13,385 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 13:21:13,551 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:21:13,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:21:13,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-02 13:21:13,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:21:13,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:21:13,866 INFO L134 CoverageAnalysis]: Checked inductivity of 30848 backedges. 6735 proven. 465 refuted. 0 times theorem prover too weak. 23648 trivial. 0 not checked. [2021-05-02 13:21:13,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309517949] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:21:13,866 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:21:13,866 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2021-05-02 13:21:13,867 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89150374] [2021-05-02 13:21:13,867 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-02 13:21:13,867 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:21:13,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-02 13:21:13,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2021-05-02 13:21:13,867 INFO L87 Difference]: Start difference. First operand 294 states and 311 transitions. Second operand has 35 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 34 states have internal predecessors, (52), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:21:15,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:21:15,271 INFO L93 Difference]: Finished difference Result 590 states and 632 transitions. [2021-05-02 13:21:15,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-02 13:21:15,272 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 34 states have internal predecessors, (52), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 316 [2021-05-02 13:21:15,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:21:15,273 INFO L225 Difference]: With dead ends: 590 [2021-05-02 13:21:15,273 INFO L226 Difference]: Without dead ends: 303 [2021-05-02 13:21:15,274 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 334 SyntacticMatches, 1 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 469 ImplicationChecksByTransitivity, 1434.2ms TimeCoverageRelationStatistics Valid=253, Invalid=4037, Unknown=0, NotChecked=0, Total=4290 [2021-05-02 13:21:15,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2021-05-02 13:21:15,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 302. [2021-05-02 13:21:15,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 302 states, 286 states have (on average 1.0384615384615385) internal successors, (297), 287 states have internal predecessors, (297), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 13:21:15,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 319 transitions. [2021-05-02 13:21:15,305 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 319 transitions. Word has length 316 [2021-05-02 13:21:15,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:21:15,305 INFO L480 AbstractCegarLoop]: Abstraction has 302 states and 319 transitions. [2021-05-02 13:21:15,306 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 35 states have (on average 1.4857142857142858) internal successors, (52), 34 states have internal predecessors, (52), 2 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 13:21:15,306 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 319 transitions. [2021-05-02 13:21:15,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2021-05-02 13:21:15,307 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:21:15,307 INFO L523 BasicCegarLoop]: trace histogram [248, 9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:21:15,512 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 13:21:15,513 INFO L428 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:21:15,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:21:15,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1140522720, now seen corresponding path program 29 times [2021-05-02 13:21:15,513 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:21:15,513 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020440117] [2021-05-02 13:21:15,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:21:15,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:16,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:21:16,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:16,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-02 13:21:16,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:16,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 79 [2021-05-02 13:21:16,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:16,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 118 [2021-05-02 13:21:16,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:16,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 157 [2021-05-02 13:21:16,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:16,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 196 [2021-05-02 13:21:16,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:16,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 235 [2021-05-02 13:21:16,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:16,208 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 274 [2021-05-02 13:21:16,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:16,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 313 [2021-05-02 13:21:16,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:21:16,211 INFO L134 CoverageAnalysis]: Checked inductivity of 32860 backedges. 7192 proven. 496 refuted. 0 times theorem prover too weak. 25172 trivial. 0 not checked. [2021-05-02 13:21:16,211 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:21:16,211 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020440117] [2021-05-02 13:21:16,211 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1020440117] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:21:16,211 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [445456366] [2021-05-02 13:21:16,211 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:24:41,816 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2021-05-02 13:24:41,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:24:41,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 515 conjuncts, 67 conjunts are in the unsatisfiable core [2021-05-02 13:24:41,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:24:42,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:24:42,229 INFO L134 CoverageAnalysis]: Checked inductivity of 32860 backedges. 13370 proven. 496 refuted. 0 times theorem prover too weak. 18994 trivial. 0 not checked. [2021-05-02 13:24:42,230 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [445456366] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:24:42,230 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 13:24:42,230 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2021-05-02 13:24:42,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [463039055] [2021-05-02 13:24:42,240 INFO L460 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-05-02 13:24:42,240 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:24:42,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-05-02 13:24:42,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2021-05-02 13:24:42,241 INFO L87 Difference]: Start difference. First operand 302 states and 319 transitions. Second operand has 36 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 35 states have internal predecessors, (57), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:24:43,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:24:43,694 INFO L93 Difference]: Finished difference Result 606 states and 648 transitions. [2021-05-02 13:24:43,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-02 13:24:43,694 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 35 states have internal predecessors, (57), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 324 [2021-05-02 13:24:43,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:24:43,695 INFO L225 Difference]: With dead ends: 606 [2021-05-02 13:24:43,695 INFO L226 Difference]: Without dead ends: 311 [2021-05-02 13:24:43,696 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 339 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 504 ImplicationChecksByTransitivity, 1599.7ms TimeCoverageRelationStatistics Valid=261, Invalid=4295, Unknown=0, NotChecked=0, Total=4556 [2021-05-02 13:24:43,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2021-05-02 13:24:43,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 310. [2021-05-02 13:24:43,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 294 states have (on average 1.0374149659863945) internal successors, (305), 295 states have internal predecessors, (305), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 13:24:43,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 327 transitions. [2021-05-02 13:24:43,729 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 327 transitions. Word has length 324 [2021-05-02 13:24:43,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:24:43,729 INFO L480 AbstractCegarLoop]: Abstraction has 310 states and 327 transitions. [2021-05-02 13:24:43,729 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 36 states, 36 states have (on average 1.5833333333333333) internal successors, (57), 35 states have internal predecessors, (57), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:24:43,729 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 327 transitions. [2021-05-02 13:24:43,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2021-05-02 13:24:43,730 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:24:43,731 INFO L523 BasicCegarLoop]: trace histogram [256, 9, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:24:43,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 13:24:43,944 INFO L428 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:24:43,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:24:43,944 INFO L82 PathProgramCache]: Analyzing trace with hash 658416176, now seen corresponding path program 30 times [2021-05-02 13:24:43,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:24:43,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064042778] [2021-05-02 13:24:43,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:24:44,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:44,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:24:44,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:44,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-02 13:24:44,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:44,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2021-05-02 13:24:44,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:44,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 121 [2021-05-02 13:24:44,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:44,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 161 [2021-05-02 13:24:44,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:44,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 201 [2021-05-02 13:24:44,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:44,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 241 [2021-05-02 13:24:44,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:44,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 281 [2021-05-02 13:24:44,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:44,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 321 [2021-05-02 13:24:44,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:24:44,694 INFO L134 CoverageAnalysis]: Checked inductivity of 34936 backedges. 7647 proven. 528 refuted. 0 times theorem prover too weak. 26761 trivial. 0 not checked. [2021-05-02 13:24:44,694 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:24:44,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064042778] [2021-05-02 13:24:44,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064042778] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:24:44,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295426221] [2021-05-02 13:24:44,694 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true