/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_4.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:49:22,988 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:49:22,991 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:49:23,004 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:49:23,005 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:49:23,006 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:49:23,007 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:49:23,009 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:49:23,011 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:49:23,011 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:49:23,012 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:49:23,013 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:49:23,014 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:49:23,015 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:49:23,016 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:49:23,017 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:49:23,018 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:49:23,018 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:49:23,020 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:49:23,022 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:49:23,024 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:49:23,025 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:49:23,026 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:49:23,027 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:49:23,029 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:49:23,040 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:49:23,040 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:49:23,041 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:49:23,042 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 [2020-07-20 11:49:23,057 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:49:23,058 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:49:23,059 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:49:23,059 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:49:23,059 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:49:23,060 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:49:23,060 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:49:23,060 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:49:23,060 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:49:23,061 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:49:23,061 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:49:23,061 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:49:23,061 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:49:23,061 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:49:23,062 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:49:23,062 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:49:23,062 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:49:23,062 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:49:23,062 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:49:23,063 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:49:23,063 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:49:23,063 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:49:23,063 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:49:23,063 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:49:23,064 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:49:23,064 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:49:23,064 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:23,064 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:49:23,064 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:49:23,065 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY [2020-07-20 11:49:23,348 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:49:23,362 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:49:23,366 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:49:23,367 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:49:23,368 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:49:23,369 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-crafted/simple_array_index_value_4.i [2020-07-20 11:49:23,451 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8c0267dc0/bd6a144d41a84013a27ad5951c7e9638/FLAG88d9ea1fc [2020-07-20 11:49:23,909 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:49:23,909 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-crafted/simple_array_index_value_4.i [2020-07-20 11:49:23,917 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8c0267dc0/bd6a144d41a84013a27ad5951c7e9638/FLAG88d9ea1fc [2020-07-20 11:49:24,289 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8c0267dc0/bd6a144d41a84013a27ad5951c7e9638 [2020-07-20 11:49:24,301 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:49:24,304 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:49:24,309 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:49:24,309 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:49:24,313 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:49:24,314 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:49:24" (1/1) ... [2020-07-20 11:49:24,317 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@423f00c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:24, skipping insertion in model container [2020-07-20 11:49:24,317 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:49:24" (1/1) ... [2020-07-20 11:49:24,326 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:49:24,347 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:49:24,567 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:49:24,572 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:49:24,594 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:49:24,612 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:49:24,613 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:24 WrapperNode [2020-07-20 11:49:24,613 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:49:24,613 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:49:24,614 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:49:24,614 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:49:24,712 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:24" (1/1) ... [2020-07-20 11:49:24,712 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:24" (1/1) ... [2020-07-20 11:49:24,720 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:24" (1/1) ... [2020-07-20 11:49:24,720 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:24" (1/1) ... [2020-07-20 11:49:24,727 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:24" (1/1) ... [2020-07-20 11:49:24,737 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:24" (1/1) ... [2020-07-20 11:49:24,739 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:24" (1/1) ... [2020-07-20 11:49:24,742 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:49:24,746 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:49:24,746 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:49:24,746 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:49:24,749 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:24" (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 [2020-07-20 11:49:24,810 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:49:24,811 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:49:24,811 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 11:49:24,811 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 11:49:24,811 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:49:24,811 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:49:24,811 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 11:49:24,811 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 11:49:24,812 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 11:49:24,812 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 11:49:24,812 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:49:24,812 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 11:49:24,812 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 11:49:24,812 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 11:49:24,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:49:24,813 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:49:24,813 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 11:49:25,081 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:49:25,082 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-20 11:49:25,086 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:49:25 BoogieIcfgContainer [2020-07-20 11:49:25,087 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:49:25,088 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:49:25,089 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:49:25,092 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:49:25,092 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:49:24" (1/3) ... [2020-07-20 11:49:25,093 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b7b1661 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:49:25, skipping insertion in model container [2020-07-20 11:49:25,093 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:49:24" (2/3) ... [2020-07-20 11:49:25,094 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b7b1661 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:49:25, skipping insertion in model container [2020-07-20 11:49:25,094 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:49:25" (3/3) ... [2020-07-20 11:49:25,096 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_4.i [2020-07-20 11:49:25,108 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:49:25,116 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:49:25,133 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:49:25,175 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:49:25,176 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:49:25,176 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:49:25,176 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:49:25,176 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:49:25,176 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:49:25,176 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:49:25,177 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:49:25,214 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 11:49:25,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 11:49:25,221 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:25,222 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:25,223 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:25,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:25,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1561713717, now seen corresponding path program 1 times [2020-07-20 11:49:25,238 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:25,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [661751755] [2020-07-20 11:49:25,239 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:25,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:25,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 11:49:25,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:25,355 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 11:49:25,355 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:49:25,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [661751755] [2020-07-20 11:49:25,357 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:49:25,357 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 11:49:25,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937532355] [2020-07-20 11:49:25,365 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 11:49:25,365 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:25,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 11:49:25,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:49:25,382 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 2 states. [2020-07-20 11:49:25,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:25,408 INFO L93 Difference]: Finished difference Result 59 states and 81 transitions. [2020-07-20 11:49:25,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 11:49:25,410 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2020-07-20 11:49:25,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:25,421 INFO L225 Difference]: With dead ends: 59 [2020-07-20 11:49:25,421 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 11:49:25,425 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:49:25,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 11:49:25,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 11:49:25,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 11:49:25,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-07-20 11:49:25,472 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 22 [2020-07-20 11:49:25,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:25,473 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-07-20 11:49:25,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 11:49:25,473 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-07-20 11:49:25,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 11:49:25,475 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:25,475 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:25,690 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:25,690 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:25,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:25,691 INFO L82 PathProgramCache]: Analyzing trace with hash -258750159, now seen corresponding path program 1 times [2020-07-20 11:49:25,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:25,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [646701512] [2020-07-20 11:49:25,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:25,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:25,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 11:49:25,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:25,874 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:25,879 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 11:49:25,953 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 11:49:25,953 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:49:25,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [646701512] [2020-07-20 11:49:25,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:49:25,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 11:49:25,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648030117] [2020-07-20 11:49:25,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 11:49:25,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:25,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 11:49:25,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-20 11:49:25,958 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 8 states. [2020-07-20 11:49:26,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:26,126 INFO L93 Difference]: Finished difference Result 37 states and 41 transitions. [2020-07-20 11:49:26,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:49:26,127 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-20 11:49:26,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:26,129 INFO L225 Difference]: With dead ends: 37 [2020-07-20 11:49:26,129 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 11:49:26,130 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 11:49:26,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 11:49:26,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-07-20 11:49:26,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 11:49:26,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-20 11:49:26,141 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 22 [2020-07-20 11:49:26,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:26,142 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-20 11:49:26,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 11:49:26,142 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-20 11:49:26,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 11:49:26,143 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:26,144 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:26,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:26,359 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:26,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:26,361 INFO L82 PathProgramCache]: Analyzing trace with hash 1843057556, now seen corresponding path program 1 times [2020-07-20 11:49:26,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:26,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851237655] [2020-07-20 11:49:26,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:26,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:49:26,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 11:49:26,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:49:26,432 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 11:49:26,432 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:49:26,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851237655] [2020-07-20 11:49:26,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:49:26,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:49:26,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181975284] [2020-07-20 11:49:26,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:49:26,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:49:26,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:49:26,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:49:26,435 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 3 states. [2020-07-20 11:49:26,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:49:26,447 INFO L93 Difference]: Finished difference Result 47 states and 53 transitions. [2020-07-20 11:49:26,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:49:26,448 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 11:49:26,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:49:26,449 INFO L225 Difference]: With dead ends: 47 [2020-07-20 11:49:26,449 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 11:49:26,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:49:26,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 11:49:26,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2020-07-20 11:49:26,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 11:49:26,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2020-07-20 11:49:26,459 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 24 [2020-07-20 11:49:26,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:49:26,459 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2020-07-20 11:49:26,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:49:26,460 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2020-07-20 11:49:26,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 11:49:26,461 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:49:26,461 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:49:26,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:49:26,676 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:49:26,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:49:26,677 INFO L82 PathProgramCache]: Analyzing trace with hash -506278145, now seen corresponding path program 1 times [2020-07-20 11:49:26,678 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:49:26,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1351240285] [2020-07-20 11:49:26,679 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 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in