/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 NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:43:49,569 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:43:49,572 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:43:49,585 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:43:49,585 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:43:49,587 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:43:49,588 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:43:49,590 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:43:49,592 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:43:49,593 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:43:49,594 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:43:49,595 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:43:49,595 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:43:49,596 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:43:49,597 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:43:49,599 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:43:49,600 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:43:49,600 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:43:49,602 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:43:49,604 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:43:49,606 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:43:49,607 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:43:49,608 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:43:49,609 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:43:49,612 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:43:49,620 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:43:49,621 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:43:49,621 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:43:49,622 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 17:43:49,646 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:43:49,647 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:43:49,649 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:43:49,649 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:43:49,650 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:43:49,650 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:43:49,650 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:43:49,650 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:43:49,650 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:43:49,651 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:43:49,652 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:43:49,652 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:43:49,652 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:43:49,653 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:43:49,653 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:43:49,653 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:43:49,653 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:43:49,654 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:43:49,654 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:43:49,654 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:43:49,654 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:43:49,655 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:43:49,655 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:43:49,655 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:43:49,655 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:43:49,656 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:43:49,656 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:49,656 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:43:49,656 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:43:49,656 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 -> NUM_VARIABLES 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 -> 4 [2020-07-20 17:43:49,960 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:43:49,975 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:43:49,983 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:43:49,985 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:43:49,985 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:43:49,986 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-20 17:43:50,072 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ebd82a477/57d517060b3a4231879bcfc76df588d2/FLAG868226587 [2020-07-20 17:43:50,612 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:43:50,612 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-20 17:43:50,618 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ebd82a477/57d517060b3a4231879bcfc76df588d2/FLAG868226587 [2020-07-20 17:43:50,973 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ebd82a477/57d517060b3a4231879bcfc76df588d2 [2020-07-20 17:43:50,985 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:43:50,989 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:43:50,990 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:43:50,990 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:43:50,994 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:43:50,995 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:43:50" (1/1) ... [2020-07-20 17:43:50,998 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60f97625 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:50, skipping insertion in model container [2020-07-20 17:43:50,998 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:43:50" (1/1) ... [2020-07-20 17:43:51,007 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:43:51,025 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:43:51,220 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:43:51,225 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:43:51,248 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:43:51,274 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:43:51,274 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51 WrapperNode [2020-07-20 17:43:51,275 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:43:51,276 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:43:51,276 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:43:51,276 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:43:51,391 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,391 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,405 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,406 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,421 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,427 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,434 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,443 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:43:51,445 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:43:51,445 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:43:51,446 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:43:51,447 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (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 17:43:51,524 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:43:51,525 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:43:51,525 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:43:51,525 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:43:51,525 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:43:51,525 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:43:51,526 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:43:51,526 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:43:51,526 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 17:43:51,526 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 17:43:51,526 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 17:43:51,527 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 17:43:51,527 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:43:51,527 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:43:51,852 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:43:51,856 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-20 17:43:51,866 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:43:51 BoogieIcfgContainer [2020-07-20 17:43:51,866 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:43:51,867 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:43:51,867 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:43:51,872 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:43:51,872 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:43:50" (1/3) ... [2020-07-20 17:43:51,873 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@260232c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:43:51, skipping insertion in model container [2020-07-20 17:43:51,874 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (2/3) ... [2020-07-20 17:43:51,874 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@260232c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:43:51, skipping insertion in model container [2020-07-20 17:43:51,874 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:43:51" (3/3) ... [2020-07-20 17:43:51,876 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-1.i [2020-07-20 17:43:51,890 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:43:51,896 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:43:51,910 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:43:51,935 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:43:51,935 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:43:51,935 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:43:51,935 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:43:51,936 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:43:51,936 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:43:51,936 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:43:51,936 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:43:51,954 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-20 17:43:51,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 17:43:51,960 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:51,961 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:51,961 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:51,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:51,968 INFO L82 PathProgramCache]: Analyzing trace with hash -413900697, now seen corresponding path program 1 times [2020-07-20 17:43:51,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:51,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1289611173] [2020-07-20 17:43:51,976 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:52,064 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:43:52,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:52,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 17:43:52,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:52,093 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 17:43:52,094 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:43:52,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1289611173] [2020-07-20 17:43:52,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:43:52,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 17:43:52,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071293537] [2020-07-20 17:43:52,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 17:43:52,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:52,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 17:43:52,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:43:52,123 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2020-07-20 17:43:52,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:52,149 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-07-20 17:43:52,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 17:43:52,151 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2020-07-20 17:43:52,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:52,160 INFO L225 Difference]: With dead ends: 42 [2020-07-20 17:43:52,161 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 17:43:52,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 12 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 17:43:52,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 17:43:52,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 17:43:52,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 17:43:52,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-07-20 17:43:52,209 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-07-20 17:43:52,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:52,209 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-07-20 17:43:52,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 17:43:52,210 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-07-20 17:43:52,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 17:43:52,211 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:52,211 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:52,426 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:52,426 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:52,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:52,427 INFO L82 PathProgramCache]: Analyzing trace with hash 2053026861, now seen corresponding path program 1 times [2020-07-20 17:43:52,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:52,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1892337805] [2020-07-20 17:43:52,428 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:52,482 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:43:52,482 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:52,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 17:43:52,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:52,513 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 17:43:52,513 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:43:52,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1892337805] [2020-07-20 17:43:52,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:43:52,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:43:52,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867052397] [2020-07-20 17:43:52,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:43:52,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:52,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:43:52,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:43:52,518 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 3 states. [2020-07-20 17:43:52,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:52,566 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 17:43:52,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:43:52,571 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-07-20 17:43:52,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:52,574 INFO L225 Difference]: With dead ends: 35 [2020-07-20 17:43:52,574 INFO L226 Difference]: Without dead ends: 25 [2020-07-20 17:43:52,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 12 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 17:43:52,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-20 17:43:52,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-07-20 17:43:52,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 17:43:52,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-20 17:43:52,585 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2020-07-20 17:43:52,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:52,585 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-20 17:43:52,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:43:52,585 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-20 17:43:52,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 17:43:52,586 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:52,587 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:52,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:52,788 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:52,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:52,790 INFO L82 PathProgramCache]: Analyzing trace with hash 1766388751, now seen corresponding path program 1 times [2020-07-20 17:43:52,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:52,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1192088751] [2020-07-20 17:43:52,791 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:52,836 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:43:52,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:52,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:43:52,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:52,872 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:52,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:52,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:52,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1192088751] [2020-07-20 17:43:52,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:52,942 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 17:43:52,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276062120] [2020-07-20 17:43:52,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:43:52,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:52,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:43:52,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:43:52,945 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 6 states. [2020-07-20 17:43:53,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:53,031 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2020-07-20 17:43:53,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:43:53,031 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-07-20 17:43:53,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:53,033 INFO L225 Difference]: With dead ends: 52 [2020-07-20 17:43:53,033 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 17:43:53,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:43:53,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 17:43:53,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-07-20 17:43:53,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 17:43:53,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-07-20 17:43:53,044 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 16 [2020-07-20 17:43:53,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:53,045 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-07-20 17:43:53,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:43:53,045 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-07-20 17:43:53,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:43:53,046 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:53,046 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:53,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:53,260 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:53,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:53,260 INFO L82 PathProgramCache]: Analyzing trace with hash 671453365, now seen corresponding path program 2 times [2020-07-20 17:43:53,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:53,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1030268880] [2020-07-20 17:43:53,261 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:53,330 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:43:53,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:53,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 17:43:53,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:53,381 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:53,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:53,492 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:53,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1030268880] [2020-07-20 17:43:53,493 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:53,493 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 17:43:53,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908058587] [2020-07-20 17:43:53,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 17:43:53,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:53,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 17:43:53,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:43:53,495 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 12 states. [2020-07-20 17:43:53,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:53,660 INFO L93 Difference]: Finished difference Result 102 states and 129 transitions. [2020-07-20 17:43:53,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 17:43:53,660 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-07-20 17:43:53,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:53,662 INFO L225 Difference]: With dead ends: 102 [2020-07-20 17:43:53,662 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 17:43:53,663 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:43:53,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 17:43:53,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 72. [2020-07-20 17:43:53,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 17:43:53,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 83 transitions. [2020-07-20 17:43:53,677 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 83 transitions. Word has length 22 [2020-07-20 17:43:53,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:53,677 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 83 transitions. [2020-07-20 17:43:53,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 17:43:53,677 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 83 transitions. [2020-07-20 17:43:53,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-20 17:43:53,678 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:53,679 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:53,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:53,892 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:53,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:53,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1999606655, now seen corresponding path program 3 times [2020-07-20 17:43:53,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:53,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [787187662] [2020-07-20 17:43:53,895 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:54,041 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:54,041 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:54,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 17:43:54,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:54,189 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:54,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:54,454 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:54,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [787187662] [2020-07-20 17:43:54,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:54,455 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 17:43:54,455 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739575033] [2020-07-20 17:43:54,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 17:43:54,456 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:54,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 17:43:54,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 17:43:54,457 INFO L87 Difference]: Start difference. First operand 72 states and 83 transitions. Second operand 24 states. [2020-07-20 17:43:54,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:54,871 INFO L93 Difference]: Finished difference Result 210 states and 267 transitions. [2020-07-20 17:43:54,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 17:43:54,872 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 34 [2020-07-20 17:43:54,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:54,874 INFO L225 Difference]: With dead ends: 210 [2020-07-20 17:43:54,874 INFO L226 Difference]: Without dead ends: 165 [2020-07-20 17:43:54,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 17:43:54,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2020-07-20 17:43:54,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 144. [2020-07-20 17:43:54,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-20 17:43:54,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 167 transitions. [2020-07-20 17:43:54,906 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 167 transitions. Word has length 34 [2020-07-20 17:43:54,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:54,907 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 167 transitions. [2020-07-20 17:43:54,907 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 17:43:54,907 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 167 transitions. [2020-07-20 17:43:54,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-20 17:43:54,911 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:54,911 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:55,119 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:55,120 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:55,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:55,121 INFO L82 PathProgramCache]: Analyzing trace with hash -54841831, now seen corresponding path program 4 times [2020-07-20 17:43:55,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:55,122 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [124942609] [2020-07-20 17:43:55,123 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 17:43:56,448 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:56,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:56,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 17:43:56,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:56,840 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:56,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:57,841 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:57,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [124942609] [2020-07-20 17:43:57,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:57,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-20 17:43:57,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037715130] [2020-07-20 17:43:57,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 17:43:57,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:57,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 17:43:57,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 17:43:57,845 INFO L87 Difference]: Start difference. First operand 144 states and 167 transitions. Second operand 48 states. [2020-07-20 17:43:58,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:58,578 INFO L93 Difference]: Finished difference Result 426 states and 543 transitions. [2020-07-20 17:43:58,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 17:43:58,578 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 58 [2020-07-20 17:43:58,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:58,581 INFO L225 Difference]: With dead ends: 426 [2020-07-20 17:43:58,581 INFO L226 Difference]: Without dead ends: 333 [2020-07-20 17:43:58,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 17:43:58,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-20 17:43:58,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 288. [2020-07-20 17:43:58,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-20 17:43:58,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 335 transitions. [2020-07-20 17:43:58,610 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 335 transitions. Word has length 58 [2020-07-20 17:43:58,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:58,611 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 335 transitions. [2020-07-20 17:43:58,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 17:43:58,611 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 335 transitions. [2020-07-20 17:43:58,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-20 17:43:58,614 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:58,615 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:58,829 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:58,830 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:58,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:58,831 INFO L82 PathProgramCache]: Analyzing trace with hash 1746458953, now seen corresponding path program 5 times [2020-07-20 17:43:58,831 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:58,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1858942184] [2020-07-20 17:43:58,832 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:46:35,850 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:46:35,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:46:37,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-20 17:46:37,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:46:38,793 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:46:38,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:46:42,504 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:46:42,505 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1858942184] [2020-07-20 17:46:42,505 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:46:42,505 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-20 17:46:42,505 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754305058] [2020-07-20 17:46:42,506 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-20 17:46:42,506 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:46:42,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-20 17:46:42,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 17:46:42,511 INFO L87 Difference]: Start difference. First operand 288 states and 335 transitions. Second operand 96 states. [2020-07-20 17:46:45,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:46:45,450 INFO L93 Difference]: Finished difference Result 858 states and 1095 transitions. [2020-07-20 17:46:45,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-20 17:46:45,450 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 106 [2020-07-20 17:46:45,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:46:45,455 INFO L225 Difference]: With dead ends: 858 [2020-07-20 17:46:45,455 INFO L226 Difference]: Without dead ends: 669 [2020-07-20 17:46:45,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 17:46:45,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 669 states. [2020-07-20 17:46:45,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 669 to 576. [2020-07-20 17:46:45,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 576 states. [2020-07-20 17:46:45,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 671 transitions. [2020-07-20 17:46:45,492 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 671 transitions. Word has length 106 [2020-07-20 17:46:45,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:46:45,493 INFO L479 AbstractCegarLoop]: Abstraction has 576 states and 671 transitions. [2020-07-20 17:46:45,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-20 17:46:45,493 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 671 transitions. [2020-07-20 17:46:45,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2020-07-20 17:46:45,496 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:46:45,496 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:46:45,697 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:46:45,697 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:46:45,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:46:45,698 INFO L82 PathProgramCache]: Analyzing trace with hash 982831017, now seen corresponding path program 6 times [2020-07-20 17:46:45,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:46:45,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1273337987] [2020-07-20 17:46:45,699 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in