/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 SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 20:20:46,996 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 20:20:46,999 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 20:20:47,011 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 20:20:47,011 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 20:20:47,013 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 20:20:47,014 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 20:20:47,016 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 20:20:47,017 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 20:20:47,018 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 20:20:47,019 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 20:20:47,020 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 20:20:47,021 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 20:20:47,022 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 20:20:47,023 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 20:20:47,024 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 20:20:47,024 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 20:20:47,025 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 20:20:47,027 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 20:20:47,029 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 20:20:47,030 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 20:20:47,031 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 20:20:47,032 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 20:20:47,033 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 20:20:47,035 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 20:20:47,045 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 20:20:47,046 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 20:20:47,047 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 20:20:47,050 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 [2020-07-21 20:20:47,072 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 20:20:47,073 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 20:20:47,075 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 20:20:47,075 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 20:20:47,075 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 20:20:47,075 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 20:20:47,076 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 20:20:47,076 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 20:20:47,076 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 20:20:47,076 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 20:20:47,077 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 20:20:47,077 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 20:20:47,078 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 20:20:47,078 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 20:20:47,078 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 20:20:47,078 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 20:20:47,079 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 20:20:47,079 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 20:20:47,079 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 20:20:47,079 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 20:20:47,079 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 20:20:47,080 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 20:20:47,080 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 20:20:47,080 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 20:20:47,080 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 20:20:47,080 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 20:20:47,080 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:47,081 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 20:20:47,081 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 20:20:47,081 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 -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 20:20:47,399 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 20:20:47,412 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 20:20:47,415 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 20:20:47,417 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 20:20:47,417 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 20:20:47,418 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-07-21 20:20:47,479 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b60daaa54/5594315b45d849bcae23c9b92984e59d/FLAG31ccb0512 [2020-07-21 20:20:47,885 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 20:20:47,886 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-07-21 20:20:47,895 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b60daaa54/5594315b45d849bcae23c9b92984e59d/FLAG31ccb0512 [2020-07-21 20:20:48,232 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b60daaa54/5594315b45d849bcae23c9b92984e59d [2020-07-21 20:20:48,243 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 20:20:48,247 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 20:20:48,248 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 20:20:48,248 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 20:20:48,252 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 20:20:48,253 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:20:48" (1/1) ... [2020-07-21 20:20:48,256 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ca7a6e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:48, skipping insertion in model container [2020-07-21 20:20:48,257 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:20:48" (1/1) ... [2020-07-21 20:20:48,265 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 20:20:48,282 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 20:20:48,534 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:20:48,540 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 20:20:48,558 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:20:48,576 INFO L208 MainTranslator]: Completed translation [2020-07-21 20:20:48,577 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:48 WrapperNode [2020-07-21 20:20:48,578 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 20:20:48,579 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 20:20:48,579 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 20:20:48,579 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 20:20:48,594 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:48" (1/1) ... [2020-07-21 20:20:48,595 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:48" (1/1) ... [2020-07-21 20:20:48,603 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:48" (1/1) ... [2020-07-21 20:20:48,603 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:48" (1/1) ... [2020-07-21 20:20:48,607 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:48" (1/1) ... [2020-07-21 20:20:48,612 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:48" (1/1) ... [2020-07-21 20:20:48,613 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:48" (1/1) ... [2020-07-21 20:20:48,614 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 20:20:48,616 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 20:20:48,616 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 20:20:48,616 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 20:20:48,617 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:48" (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 [2020-07-21 20:20:48,795 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 20:20:48,795 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 20:20:48,796 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 20:20:48,796 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 20:20:48,796 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 20:20:48,796 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 20:20:48,796 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 20:20:48,796 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 20:20:48,796 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 20:20:48,973 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 20:20:48,974 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 20:20:48,977 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:20:48 BoogieIcfgContainer [2020-07-21 20:20:48,977 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 20:20:48,979 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 20:20:48,979 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 20:20:48,982 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 20:20:48,982 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 08:20:48" (1/3) ... [2020-07-21 20:20:48,983 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@da81add and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:20:48, skipping insertion in model container [2020-07-21 20:20:48,983 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:20:48" (2/3) ... [2020-07-21 20:20:48,984 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@da81add and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:20:48, skipping insertion in model container [2020-07-21 20:20:48,984 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:20:48" (3/3) ... [2020-07-21 20:20:48,986 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-07-21 20:20:48,996 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 20:20:49,004 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 20:20:49,017 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 20:20:49,041 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 20:20:49,042 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 20:20:49,042 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 20:20:49,042 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 20:20:49,042 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 20:20:49,042 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 20:20:49,043 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 20:20:49,043 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 20:20:49,062 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-07-21 20:20:49,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 20:20:49,068 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:49,069 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:49,070 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:49,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:49,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-07-21 20:20:49,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:49,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [47079973] [2020-07-21 20:20:49,083 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 [2020-07-21 20:20:49,137 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:20:49,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:20:49,140 INFO L263 TraceCheckSpWp]: Trace formula consists of 15 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 20:20:49,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:49,185 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:20:49,185 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:20:49,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [47079973] [2020-07-21 20:20:49,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:20:49,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 20:20:49,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315067638] [2020-07-21 20:20:49,192 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 20:20:49,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:49,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 20:20:49,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 20:20:49,208 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-07-21 20:20:49,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:20:49,247 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-21 20:20:49,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 20:20:49,249 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-21 20:20:49,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:20:49,258 INFO L225 Difference]: With dead ends: 29 [2020-07-21 20:20:49,259 INFO L226 Difference]: Without dead ends: 12 [2020-07-21 20:20:49,262 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 20:20:49,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-07-21 20:20:49,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-07-21 20:20:49,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-07-21 20:20:49,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-07-21 20:20:49,303 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-07-21 20:20:49,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:20:49,303 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-07-21 20:20:49,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 20:20:49,304 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-07-21 20:20:49,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-21 20:20:49,305 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:49,305 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:49,519 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:49,519 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:49,520 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:49,521 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-07-21 20:20:49,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:49,522 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [881328981] [2020-07-21 20:20:49,522 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 [2020-07-21 20:20:49,548 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:20:49,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:20:49,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 20:20:49,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:49,574 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:20:49,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:20:49,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:20:49,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [881328981] [2020-07-21 20:20:49,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:20:49,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 20:20:49,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384214642] [2020-07-21 20:20:49,627 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 20:20:49,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:49,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 20:20:49,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:20:49,631 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 6 states. [2020-07-21 20:20:49,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:20:49,706 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-07-21 20:20:49,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 20:20:49,706 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-07-21 20:20:49,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:20:49,707 INFO L225 Difference]: With dead ends: 20 [2020-07-21 20:20:49,708 INFO L226 Difference]: Without dead ends: 15 [2020-07-21 20:20:49,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-07-21 20:20:49,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-21 20:20:49,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-21 20:20:49,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 20:20:49,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-21 20:20:49,714 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2020-07-21 20:20:49,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:20:49,715 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-21 20:20:49,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 20:20:49,715 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-21 20:20:49,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 20:20:49,716 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:49,717 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:49,929 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:49,931 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:49,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:49,932 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 2 times [2020-07-21 20:20:49,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:49,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1679658282] [2020-07-21 20:20:49,933 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 [2020-07-21 20:20:49,963 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 20:20:49,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:20:49,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 20:20:49,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:50,013 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:20:50,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:20:50,127 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:20:50,128 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1679658282] [2020-07-21 20:20:50,128 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:20:50,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 20:20:50,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430736503] [2020-07-21 20:20:50,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 20:20:50,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:50,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 20:20:50,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2020-07-21 20:20:50,130 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-07-21 20:20:52,366 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 20:20:52,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:20:52,648 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-07-21 20:20:52,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 20:20:52,650 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-07-21 20:20:52,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:20:52,651 INFO L225 Difference]: With dead ends: 26 [2020-07-21 20:20:52,651 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 20:20:52,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=94, Invalid=146, Unknown=0, NotChecked=0, Total=240 [2020-07-21 20:20:52,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 20:20:52,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 20:20:52,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 20:20:52,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-07-21 20:20:52,659 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2020-07-21 20:20:52,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:20:52,659 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-07-21 20:20:52,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 20:20:52,660 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-21 20:20:52,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 20:20:52,660 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:20:52,661 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:20:52,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:20:52,863 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:20:52,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:20:52,864 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 3 times [2020-07-21 20:20:52,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:20:52,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1914993441] [2020-07-21 20:20:52,864 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) 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 [2020-07-21 20:20:52,953 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:20:52,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:20:52,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 20:20:52,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:20:53,128 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:20:53,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:20:59,853 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 54 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:20:59,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1914993441] [2020-07-21 20:20:59,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:20:59,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 20:20:59,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372112395] [2020-07-21 20:20:59,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 20:20:59,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:20:59,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 20:20:59,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=383, Unknown=3, NotChecked=0, Total=552 [2020-07-21 20:20:59,856 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 24 states. [2020-07-21 20:21:00,810 WARN L193 SmtUtils]: Spent 640.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 20:21:01,675 WARN L193 SmtUtils]: Spent 418.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 20:21:07,862 WARN L193 SmtUtils]: Spent 4.67 s on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 20:21:14,553 WARN L193 SmtUtils]: Spent 2.24 s on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 20:21:15,153 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 20:21:37,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:21:37,338 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-07-21 20:21:37,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 20:21:37,340 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 20 [2020-07-21 20:21:37,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:21:37,341 INFO L225 Difference]: With dead ends: 38 [2020-07-21 20:21:37,341 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 20:21:37,342 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 44.1s TimeCoverageRelationStatistics Valid=406, Invalid=708, Unknown=8, NotChecked=0, Total=1122 [2020-07-21 20:21:37,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 20:21:37,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 20:21:37,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 20:21:37,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-21 20:21:37,350 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2020-07-21 20:21:37,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:21:37,350 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-21 20:21:37,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 20:21:37,351 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-21 20:21:37,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-21 20:21:37,352 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:21:37,352 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:21:37,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:21:37,555 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:21:37,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:21:37,556 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 4 times [2020-07-21 20:21:37,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:21:37,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1660964335] [2020-07-21 20:21:37,557 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:21:37,697 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:21:37,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:21:37,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-21 20:21:37,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:21:38,049 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:21:38,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:22:06,573 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 242 refuted. 11 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:22:06,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1660964335] [2020-07-21 20:22:06,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:22:06,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-21 20:22:06,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728990669] [2020-07-21 20:22:06,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 20:22:06,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:22:06,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 20:22:06,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1621, Unknown=13, NotChecked=0, Total=2256 [2020-07-21 20:22:06,577 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 48 states. [2020-07-21 20:22:09,233 WARN L193 SmtUtils]: Spent 1.36 s on a formula simplification. DAG size of input: 116 DAG size of output: 11 [2020-07-21 20:22:14,021 WARN L193 SmtUtils]: Spent 3.37 s on a formula simplification. DAG size of input: 111 DAG size of output: 11 [2020-07-21 20:22:17,541 WARN L193 SmtUtils]: Spent 983.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 11 [2020-07-21 20:22:25,471 WARN L193 SmtUtils]: Spent 2.05 s on a formula simplification. DAG size of input: 101 DAG size of output: 11 [2020-07-21 20:22:34,166 WARN L193 SmtUtils]: Spent 923.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 11 [2020-07-21 20:22:38,888 WARN L193 SmtUtils]: Spent 941.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 11 [2020-07-21 20:22:44,764 WARN L193 SmtUtils]: Spent 386.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 11 [2020-07-21 20:22:57,810 WARN L193 SmtUtils]: Spent 3.45 s on a formula simplification. DAG size of input: 81 DAG size of output: 11 [2020-07-21 20:23:06,796 WARN L193 SmtUtils]: Spent 526.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-21 20:23:14,680 WARN L193 SmtUtils]: Spent 869.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-21 20:23:22,935 WARN L193 SmtUtils]: Spent 360.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-21 20:23:30,085 WARN L193 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-21 20:23:39,744 WARN L193 SmtUtils]: Spent 746.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 20:23:48,640 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 20:23:57,675 WARN L193 SmtUtils]: Spent 825.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 20:24:07,286 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 20:24:17,027 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 20:25:10,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:25:10,992 INFO L93 Difference]: Finished difference Result 62 states and 85 transitions. [2020-07-21 20:25:10,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 20:25:10,993 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 32 [2020-07-21 20:25:10,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:25:10,994 INFO L225 Difference]: With dead ends: 62 [2020-07-21 20:25:10,994 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 20:25:10,997 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 210.6s TimeCoverageRelationStatistics Valid=1675, Invalid=3129, Unknown=26, NotChecked=0, Total=4830 [2020-07-21 20:25:10,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 20:25:11,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-21 20:25:11,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 20:25:11,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-07-21 20:25:11,008 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 32 [2020-07-21 20:25:11,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:25:11,008 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-07-21 20:25:11,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 20:25:11,008 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-07-21 20:25:11,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 20:25:11,010 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:25:11,010 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:25:11,214 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:25:11,214 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:25:11,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:25:11,215 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 5 times [2020-07-21 20:25:11,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:25:11,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [869741760] [2020-07-21 20:25:11,216 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:25:12,150 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:25:12,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:25:12,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-21 20:25:12,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:25:13,665 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:25:13,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:27:00,119 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1043 refuted. 38 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:27:00,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [869741760] [2020-07-21 20:27:00,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:27:00,120 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-21 20:27:00,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747128718] [2020-07-21 20:27:00,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-21 20:27:00,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:27:00,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-21 20:27:00,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2398, Invalid=6675, Unknown=47, NotChecked=0, Total=9120 [2020-07-21 20:27:00,126 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 96 states. [2020-07-21 20:27:21,946 WARN L193 SmtUtils]: Spent 11.42 s on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2020-07-21 20:27:53,447 WARN L193 SmtUtils]: Spent 19.29 s on a formula simplification. DAG size of input: 231 DAG size of output: 11 [2020-07-21 20:28:25,869 WARN L193 SmtUtils]: Spent 14.73 s on a formula simplification. DAG size of input: 226 DAG size of output: 11 [2020-07-21 20:28:57,930 WARN L193 SmtUtils]: Spent 11.23 s on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2020-07-21 20:29:30,182 WARN L193 SmtUtils]: Spent 8.78 s on a formula simplification. DAG size of input: 216 DAG size of output: 11 [2020-07-21 20:29:57,802 WARN L193 SmtUtils]: Spent 7.31 s on a formula simplification. DAG size of input: 211 DAG size of output: 11 [2020-07-21 20:30:38,522 WARN L193 SmtUtils]: Spent 5.81 s on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2020-07-21 20:31:25,616 WARN L193 SmtUtils]: Spent 9.63 s on a formula simplification. DAG size of input: 201 DAG size of output: 11 [2020-07-21 20:32:14,075 WARN L193 SmtUtils]: Spent 10.32 s on a formula simplification. DAG size of input: 196 DAG size of output: 11 [2020-07-21 20:32:56,334 WARN L193 SmtUtils]: Spent 9.58 s on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2020-07-21 20:33:44,861 WARN L193 SmtUtils]: Spent 5.06 s on a formula simplification. DAG size of input: 186 DAG size of output: 11 [2020-07-21 20:34:38,862 WARN L193 SmtUtils]: Spent 7.72 s on a formula simplification. DAG size of input: 181 DAG size of output: 11 [2020-07-21 20:35:31,758 WARN L193 SmtUtils]: Spent 10.17 s on a formula simplification. DAG size of input: 176 DAG size of output: 11