/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_FUNCTIONS --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/array_3-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 14:02:09,170 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 14:02:09,173 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 14:02:09,193 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 14:02:09,193 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 14:02:09,195 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 14:02:09,197 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 14:02:09,208 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 14:02:09,211 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 14:02:09,212 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 14:02:09,213 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 14:02:09,216 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 14:02:09,216 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 14:02:09,218 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 14:02:09,219 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 14:02:09,223 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 14:02:09,224 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 14:02:09,226 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 14:02:09,228 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 14:02:09,232 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 14:02:09,235 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 14:02:09,239 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 14:02:09,241 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 14:02:09,242 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 14:02:09,246 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 14:02:09,261 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 14:02:09,262 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 14:02:09,263 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 14:02:09,264 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 14:02:09,292 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 14:02:09,292 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 14:02:09,293 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 14:02:09,294 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 14:02:09,294 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 14:02:09,294 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 14:02:09,294 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 14:02:09,294 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 14:02:09,295 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 14:02:09,295 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 14:02:09,295 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 14:02:09,295 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 14:02:09,295 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 14:02:09,296 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 14:02:09,296 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 14:02:09,296 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 14:02:09,296 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 14:02:09,296 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 14:02:09,296 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 14:02:09,297 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 14:02:09,297 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 14:02:09,297 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:02:09,297 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 14:02:09,297 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 14:02:09,298 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 14:02:09,298 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 14:02:09,298 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:09,298 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 14:02:09,298 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 14:02:09,299 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_FUNCTIONS 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 14:02:09,592 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 14:02:09,607 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 14:02:09,611 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 14:02:09,612 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 14:02:09,613 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 14:02:09,614 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-21 14:02:09,683 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7d870d91a/b82f3c4f2fb94314af75d28330aaeae7/FLAG962c8b7b9 [2020-07-21 14:02:10,159 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 14:02:10,160 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-1.i [2020-07-21 14:02:10,169 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7d870d91a/b82f3c4f2fb94314af75d28330aaeae7/FLAG962c8b7b9 [2020-07-21 14:02:10,508 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7d870d91a/b82f3c4f2fb94314af75d28330aaeae7 [2020-07-21 14:02:10,520 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 14:02:10,524 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 14:02:10,526 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 14:02:10,526 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 14:02:10,530 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 14:02:10,531 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:02:10" (1/1) ... [2020-07-21 14:02:10,535 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7bfafbe4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:10, skipping insertion in model container [2020-07-21 14:02:10,535 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:02:10" (1/1) ... [2020-07-21 14:02:10,543 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 14:02:10,560 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 14:02:10,821 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:02:10,829 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 14:02:10,858 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:02:10,883 INFO L208 MainTranslator]: Completed translation [2020-07-21 14:02:10,883 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:10 WrapperNode [2020-07-21 14:02:10,884 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 14:02:10,884 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 14:02:10,885 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 14:02:10,885 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 14:02:10,900 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:10" (1/1) ... [2020-07-21 14:02:10,902 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:10" (1/1) ... [2020-07-21 14:02:11,008 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:10" (1/1) ... [2020-07-21 14:02:11,009 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:10" (1/1) ... [2020-07-21 14:02:11,023 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:10" (1/1) ... [2020-07-21 14:02:11,028 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:10" (1/1) ... [2020-07-21 14:02:11,030 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:10" (1/1) ... [2020-07-21 14:02:11,031 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 14:02:11,032 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 14:02:11,032 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 14:02:11,032 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 14:02:11,033 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:10" (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 14:02:11,102 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 14:02:11,102 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 14:02:11,102 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 14:02:11,102 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 14:02:11,103 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 14:02:11,103 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 14:02:11,103 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 14:02:11,103 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 14:02:11,103 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 14:02:11,103 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 14:02:11,104 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 14:02:11,104 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 14:02:11,104 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 14:02:11,104 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 14:02:11,343 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 14:02:11,344 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-21 14:02:11,348 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:02:11 BoogieIcfgContainer [2020-07-21 14:02:11,348 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 14:02:11,350 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 14:02:11,350 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 14:02:11,354 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 14:02:11,354 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:02:10" (1/3) ... [2020-07-21 14:02:11,355 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55ad6cde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:02:11, skipping insertion in model container [2020-07-21 14:02:11,355 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:10" (2/3) ... [2020-07-21 14:02:11,356 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@55ad6cde and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:02:11, skipping insertion in model container [2020-07-21 14:02:11,356 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:02:11" (3/3) ... [2020-07-21 14:02:11,358 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-1.i [2020-07-21 14:02:11,369 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 14:02:11,376 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 14:02:11,391 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 14:02:11,414 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 14:02:11,414 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 14:02:11,415 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 14:02:11,415 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 14:02:11,415 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 14:02:11,415 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 14:02:11,415 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 14:02:11,416 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 14:02:11,434 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-21 14:02:11,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 14:02:11,439 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:11,440 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:11,441 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:11,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:11,446 INFO L82 PathProgramCache]: Analyzing trace with hash -413900697, now seen corresponding path program 1 times [2020-07-21 14:02:11,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:11,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689578242] [2020-07-21 14:02:11,455 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 14:02:11,563 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:02:11,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:11,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 14:02:11,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:11,617 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 14:02:11,618 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:02:11,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689578242] [2020-07-21 14:02:11,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:02:11,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 14:02:11,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097098218] [2020-07-21 14:02:11,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 14:02:11,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:11,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 14:02:11,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 14:02:11,651 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2020-07-21 14:02:11,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:11,679 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-07-21 14:02:11,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 14:02:11,681 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 13 [2020-07-21 14:02:11,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:11,691 INFO L225 Difference]: With dead ends: 42 [2020-07-21 14:02:11,692 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 14:02:11,696 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 [2020-07-21 14:02:11,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 14:02:11,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 14:02:11,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 14:02:11,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-07-21 14:02:11,743 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-07-21 14:02:11,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:11,743 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-07-21 14:02:11,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 14:02:11,744 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-07-21 14:02:11,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 14:02:11,745 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:11,745 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:11,959 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:11,959 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:11,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:11,960 INFO L82 PathProgramCache]: Analyzing trace with hash 2053026861, now seen corresponding path program 1 times [2020-07-21 14:02:11,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:11,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1596514643] [2020-07-21 14:02:11,961 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 14:02:12,017 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:02:12,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:12,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 14:02:12,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:12,050 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 14:02:12,050 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:02:12,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1596514643] [2020-07-21 14:02:12,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:02:12,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:02:12,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900507579] [2020-07-21 14:02:12,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:02:12,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:12,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:02:12,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:02:12,055 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 3 states. [2020-07-21 14:02:12,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:12,110 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 14:02:12,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:02:12,111 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-07-21 14:02:12,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:12,114 INFO L225 Difference]: With dead ends: 35 [2020-07-21 14:02:12,114 INFO L226 Difference]: Without dead ends: 25 [2020-07-21 14:02:12,116 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 [2020-07-21 14:02:12,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-07-21 14:02:12,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-07-21 14:02:12,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 14:02:12,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-21 14:02:12,125 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 14 [2020-07-21 14:02:12,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:12,125 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-21 14:02:12,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:02:12,126 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-21 14:02:12,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 14:02:12,127 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:12,127 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:12,341 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:12,342 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:12,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:12,343 INFO L82 PathProgramCache]: Analyzing trace with hash 1766388751, now seen corresponding path program 1 times [2020-07-21 14:02:12,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:12,345 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1254352910] [2020-07-21 14:02:12,345 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 14:02:12,398 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:02:12,398 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:12,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 14:02:12,402 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:12,432 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 14:02:12,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:02:12,480 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 14:02:12,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1254352910] [2020-07-21 14:02:12,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:02:12,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 14:02:12,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627307047] [2020-07-21 14:02:12,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 14:02:12,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:12,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 14:02:12,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-21 14:02:12,483 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 6 states. [2020-07-21 14:02:12,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:12,566 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2020-07-21 14:02:12,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 14:02:12,566 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-07-21 14:02:12,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:12,568 INFO L225 Difference]: With dead ends: 52 [2020-07-21 14:02:12,568 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 14:02:12,569 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 [2020-07-21 14:02:12,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 14:02:12,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-07-21 14:02:12,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 14:02:12,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-07-21 14:02:12,578 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 16 [2020-07-21 14:02:12,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:12,578 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-07-21 14:02:12,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 14:02:12,579 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-07-21 14:02:12,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 14:02:12,579 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:12,580 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:12,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:12,794 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:12,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:12,796 INFO L82 PathProgramCache]: Analyzing trace with hash 671453365, now seen corresponding path program 2 times [2020-07-21 14:02:12,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:12,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698473162] [2020-07-21 14:02:12,797 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 14:02:12,885 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:02:12,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:12,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 14:02:12,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:12,962 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:02:12,963 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:02:13,077 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:02:13,077 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698473162] [2020-07-21 14:02:13,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:02:13,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 14:02:13,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746523003] [2020-07-21 14:02:13,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 14:02:13,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:13,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 14:02:13,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-21 14:02:13,085 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 12 states. [2020-07-21 14:02:13,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:13,261 INFO L93 Difference]: Finished difference Result 102 states and 129 transitions. [2020-07-21 14:02:13,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 14:02:13,262 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2020-07-21 14:02:13,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:13,263 INFO L225 Difference]: With dead ends: 102 [2020-07-21 14:02:13,263 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 14:02:13,264 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 [2020-07-21 14:02:13,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 14:02:13,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 72. [2020-07-21 14:02:13,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 14:02:13,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 83 transitions. [2020-07-21 14:02:13,278 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 83 transitions. Word has length 22 [2020-07-21 14:02:13,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:13,279 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 83 transitions. [2020-07-21 14:02:13,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 14:02:13,279 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 83 transitions. [2020-07-21 14:02:13,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 14:02:13,280 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:13,280 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:13,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:13,495 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:13,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:13,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1999606655, now seen corresponding path program 3 times [2020-07-21 14:02:13,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:13,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2106364840] [2020-07-21 14:02:13,498 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 14:02:13,570 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:02:13,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:13,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 14:02:13,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:13,719 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:02:13,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:02:13,974 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:02:13,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2106364840] [2020-07-21 14:02:13,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:02:13,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 14:02:13,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258742275] [2020-07-21 14:02:13,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 14:02:13,976 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:13,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 14:02:13,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-21 14:02:13,977 INFO L87 Difference]: Start difference. First operand 72 states and 83 transitions. Second operand 24 states. [2020-07-21 14:02:14,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:14,349 INFO L93 Difference]: Finished difference Result 210 states and 267 transitions. [2020-07-21 14:02:14,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 14:02:14,349 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 34 [2020-07-21 14:02:14,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:14,351 INFO L225 Difference]: With dead ends: 210 [2020-07-21 14:02:14,352 INFO L226 Difference]: Without dead ends: 165 [2020-07-21 14:02:14,353 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 [2020-07-21 14:02:14,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2020-07-21 14:02:14,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 144. [2020-07-21 14:02:14,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 14:02:14,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 167 transitions. [2020-07-21 14:02:14,375 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 167 transitions. Word has length 34 [2020-07-21 14:02:14,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:14,375 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 167 transitions. [2020-07-21 14:02:14,375 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 14:02:14,376 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 167 transitions. [2020-07-21 14:02:14,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-21 14:02:14,381 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:14,381 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:14,595 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:14,596 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:14,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:14,596 INFO L82 PathProgramCache]: Analyzing trace with hash -54841831, now seen corresponding path program 4 times [2020-07-21 14:02:14,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:14,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771923635] [2020-07-21 14:02:14,597 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 14:02:15,298 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:02:15,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:15,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 14:02:15,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:15,700 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:02:15,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:02:16,666 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:02:16,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771923635] [2020-07-21 14:02:16,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:02:16,667 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-21 14:02:16,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085668168] [2020-07-21 14:02:16,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 14:02:16,668 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:16,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 14:02:16,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 14:02:16,671 INFO L87 Difference]: Start difference. First operand 144 states and 167 transitions. Second operand 48 states. [2020-07-21 14:02:17,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:17,425 INFO L93 Difference]: Finished difference Result 426 states and 543 transitions. [2020-07-21 14:02:17,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 14:02:17,427 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 58 [2020-07-21 14:02:17,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:17,430 INFO L225 Difference]: With dead ends: 426 [2020-07-21 14:02:17,430 INFO L226 Difference]: Without dead ends: 333 [2020-07-21 14:02:17,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 14:02:17,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2020-07-21 14:02:17,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 288. [2020-07-21 14:02:17,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 14:02:17,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 335 transitions. [2020-07-21 14:02:17,490 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 335 transitions. Word has length 58 [2020-07-21 14:02:17,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:17,491 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 335 transitions. [2020-07-21 14:02:17,491 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 14:02:17,491 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 335 transitions. [2020-07-21 14:02:17,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 14:02:17,497 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:17,498 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:17,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:17,699 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:17,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:17,700 INFO L82 PathProgramCache]: Analyzing trace with hash 1746458953, now seen corresponding path program 5 times [2020-07-21 14:02:17,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:17,701 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [971425298] [2020-07-21 14:02:17,701 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 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 [2020-07-21 14:08:21,053 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:08:21,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:08:27,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 14:08:27,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:08:28,450 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:08:28,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:08:32,317 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:08:32,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [971425298] [2020-07-21 14:08:32,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:08:32,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-21 14:08:32,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934366062] [2020-07-21 14:08:32,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-21 14:08:32,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:08:32,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-21 14:08:32,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 14:08:32,325 INFO L87 Difference]: Start difference. First operand 288 states and 335 transitions. Second operand 96 states. [2020-07-21 14:08:35,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:08:35,364 INFO L93 Difference]: Finished difference Result 858 states and 1095 transitions. [2020-07-21 14:08:35,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 14:08:35,366 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 106 [2020-07-21 14:08:35,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:08:35,371 INFO L225 Difference]: With dead ends: 858 [2020-07-21 14:08:35,371 INFO L226 Difference]: Without dead ends: 669 [2020-07-21 14:08:35,376 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-21 14:08:35,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 669 states. [2020-07-21 14:08:35,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 669 to 576. [2020-07-21 14:08:35,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 576 states. [2020-07-21 14:08:35,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 576 states to 576 states and 671 transitions. [2020-07-21 14:08:35,410 INFO L78 Accepts]: Start accepts. Automaton has 576 states and 671 transitions. Word has length 106 [2020-07-21 14:08:35,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:08:35,411 INFO L479 AbstractCegarLoop]: Abstraction has 576 states and 671 transitions. [2020-07-21 14:08:35,411 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-21 14:08:35,411 INFO L276 IsEmpty]: Start isEmpty. Operand 576 states and 671 transitions. [2020-07-21 14:08:35,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2020-07-21 14:08:35,418 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:08:35,418 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:08:35,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:08:35,626 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:08:35,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:08:35,627 INFO L82 PathProgramCache]: Analyzing trace with hash 982831017, now seen corresponding path program 6 times [2020-07-21 14:08:35,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:08:35,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [403819881] [2020-07-21 14:08:35,629 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 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