/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-industry-pattern/mod3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 12:12:21,959 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 12:12:21,964 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 12:12:21,984 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 12:12:21,985 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 12:12:21,987 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 12:12:21,989 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 12:12:21,995 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 12:12:22,003 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 12:12:22,007 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 12:12:22,011 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 12:12:22,022 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 12:12:22,023 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 12:12:22,029 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 12:12:22,037 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 12:12:22,040 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 12:12:22,044 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 12:12:22,051 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 12:12:22,057 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 12:12:22,066 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 12:12:22,073 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 12:12:22,082 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 12:12:22,086 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 12:12:22,088 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 12:12:22,097 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 12:12:22,126 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 12:12:22,128 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 12:12:22,132 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 12:12:22,134 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 12:12:22,201 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 12:12:22,202 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 12:12:22,205 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 12:12:22,205 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 12:12:22,205 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 12:12:22,206 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 12:12:22,206 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 12:12:22,208 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 12:12:22,208 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 12:12:22,209 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 12:12:22,211 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 12:12:22,212 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 12:12:22,212 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 12:12:22,213 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 12:12:22,214 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 12:12:22,214 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 12:12:22,214 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 12:12:22,215 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 12:12:22,215 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 12:12:22,215 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 12:12:22,216 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 12:12:22,216 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 12:12:22,216 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 12:12:22,216 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 12:12:22,217 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 12:12:22,217 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 12:12:22,217 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:12:22,217 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 12:12:22,217 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 12:12:22,218 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 12:12:22,726 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 12:12:22,746 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 12:12:22,755 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 12:12:22,758 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 12:12:22,762 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 12:12:22,764 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-industry-pattern/mod3.c [2020-07-20 12:12:22,877 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4a855ae64/25f7d1db2e5b48af961e2e9f000ba9e4/FLAG499d3a7cb [2020-07-20 12:12:23,656 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 12:12:23,658 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-industry-pattern/mod3.c [2020-07-20 12:12:23,677 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4a855ae64/25f7d1db2e5b48af961e2e9f000ba9e4/FLAG499d3a7cb [2020-07-20 12:12:23,913 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4a855ae64/25f7d1db2e5b48af961e2e9f000ba9e4 [2020-07-20 12:12:23,943 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 12:12:23,950 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 12:12:23,958 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 12:12:23,959 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 12:12:23,968 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 12:12:23,972 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:12:23" (1/1) ... [2020-07-20 12:12:23,979 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@51a9a2c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:12:23, skipping insertion in model container [2020-07-20 12:12:23,980 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 12:12:23" (1/1) ... [2020-07-20 12:12:24,000 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 12:12:24,046 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 12:12:24,293 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:12:24,302 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 12:12:24,327 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 12:12:24,354 INFO L208 MainTranslator]: Completed translation [2020-07-20 12:12:24,355 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:12:24 WrapperNode [2020-07-20 12:12:24,356 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 12:12:24,358 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 12:12:24,358 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 12:12:24,359 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 12:12:24,377 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:12:24" (1/1) ... [2020-07-20 12:12:24,377 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:12:24" (1/1) ... [2020-07-20 12:12:24,385 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:12:24" (1/1) ... [2020-07-20 12:12:24,386 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:12:24" (1/1) ... [2020-07-20 12:12:24,394 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:12:24" (1/1) ... [2020-07-20 12:12:24,406 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:12:24" (1/1) ... [2020-07-20 12:12:24,409 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:12:24" (1/1) ... [2020-07-20 12:12:24,412 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 12:12:24,414 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 12:12:24,414 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 12:12:24,415 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 12:12:24,417 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:12:24" (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 12:12:24,670 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 12:12:24,671 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 12:12:24,671 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 12:12:24,672 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 12:12:24,672 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 12:12:24,673 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 12:12:24,673 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 12:12:24,673 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 12:12:24,673 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 12:12:24,673 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 12:12:25,049 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 12:12:25,049 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 12:12:25,057 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:12:25 BoogieIcfgContainer [2020-07-20 12:12:25,058 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 12:12:25,060 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 12:12:25,061 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 12:12:25,068 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 12:12:25,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 12:12:23" (1/3) ... [2020-07-20 12:12:25,072 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@774f7157 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:12:25, skipping insertion in model container [2020-07-20 12:12:25,072 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 12:12:24" (2/3) ... [2020-07-20 12:12:25,073 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@774f7157 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 12:12:25, skipping insertion in model container [2020-07-20 12:12:25,073 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 12:12:25" (3/3) ... [2020-07-20 12:12:25,078 INFO L109 eAbstractionObserver]: Analyzing ICFG mod3.c [2020-07-20 12:12:25,100 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 12:12:25,119 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 12:12:25,148 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 12:12:25,197 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 12:12:25,197 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 12:12:25,198 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 12:12:25,198 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 12:12:25,198 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 12:12:25,199 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 12:12:25,199 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 12:12:25,199 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 12:12:25,240 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-20 12:12:25,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-20 12:12:25,254 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:12:25,256 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:12:25,258 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:12:25,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:12:25,270 INFO L82 PathProgramCache]: Analyzing trace with hash 271538127, now seen corresponding path program 1 times [2020-07-20 12:12:25,286 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:12:25,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [748814477] [2020-07-20 12:12:25,288 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 12:12:25,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:12:25,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 12:12:25,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:12:25,410 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:12:25,411 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:12:25,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [748814477] [2020-07-20 12:12:25,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:12:25,416 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 12:12:25,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360433616] [2020-07-20 12:12:25,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 12:12:25,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:12:25,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 12:12:25,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 12:12:25,445 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 2 states. [2020-07-20 12:12:25,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:12:25,483 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 12:12:25,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 12:12:25,485 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-07-20 12:12:25,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:12:25,504 INFO L225 Difference]: With dead ends: 36 [2020-07-20 12:12:25,504 INFO L226 Difference]: Without dead ends: 16 [2020-07-20 12:12:25,514 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 10 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 12:12:25,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-20 12:12:25,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-07-20 12:12:25,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-20 12:12:25,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2020-07-20 12:12:25,574 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 11 [2020-07-20 12:12:25,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:12:25,575 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2020-07-20 12:12:25,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 12:12:25,576 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2020-07-20 12:12:25,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 12:12:25,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:12:25,577 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:12:25,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:12:25,786 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:12:25,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:12:25,788 INFO L82 PathProgramCache]: Analyzing trace with hash 183026044, now seen corresponding path program 1 times [2020-07-20 12:12:25,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:12:25,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [414499975] [2020-07-20 12:12:25,789 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 12:12:25,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 12:12:25,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 12:12:25,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 12:12:26,009 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 12:12:26,010 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 12:12:26,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [414499975] [2020-07-20 12:12:26,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 12:12:26,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 12:12:26,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958692489] [2020-07-20 12:12:26,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 12:12:26,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 12:12:26,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 12:12:26,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 12:12:26,030 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand 3 states. [2020-07-20 12:12:26,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 12:12:26,196 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2020-07-20 12:12:26,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 12:12:26,198 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-07-20 12:12:26,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 12:12:26,199 INFO L225 Difference]: With dead ends: 27 [2020-07-20 12:12:26,200 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 12:12:26,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 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 12:12:26,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 12:12:26,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-07-20 12:12:26,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 12:12:26,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2020-07-20 12:12:26,212 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 12 [2020-07-20 12:12:26,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 12:12:26,213 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2020-07-20 12:12:26,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 12:12:26,213 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2020-07-20 12:12:26,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 12:12:26,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 12:12:26,215 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 12:12:26,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 12:12:26,431 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 12:12:26,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 12:12:26,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1587594336, now seen corresponding path program 1 times [2020-07-20 12:12:26,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 12:12:26,435 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1521681447] [2020-07-20 12:12:26,435 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