/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test24-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:53:57,292 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:53:57,295 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:53:57,310 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:53:57,311 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:53:57,314 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:53:57,316 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:53:57,319 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:53:57,329 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:53:57,330 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:53:57,334 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:53:57,335 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:53:57,336 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:53:57,340 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:53:57,342 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:53:57,345 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:53:57,346 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:53:57,351 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:53:57,354 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:53:57,359 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:53:57,361 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:53:57,370 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:53:57,371 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:53:57,374 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:53:57,380 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:53:57,397 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:53:57,398 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:53:57,400 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:53:57,402 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 13:53:57,434 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:53:57,434 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:53:57,437 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:53:57,438 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:53:57,438 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:53:57,438 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:53:57,438 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:53:57,439 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:53:57,439 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:53:57,439 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:53:57,440 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:53:57,441 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:53:57,441 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:53:57,442 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:53:57,442 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:53:57,442 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:53:57,442 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:53:57,442 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:53:57,443 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:53:57,443 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:53:57,443 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:53:57,443 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:53:57,443 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:53:57,444 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:53:57,444 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:53:57,444 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:53:57,444 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:53:57,444 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:53:57,445 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:53:57,445 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 -> 4 [2020-07-20 13:53:57,749 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:53:57,767 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:53:57,773 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:53:57,775 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:53:57,775 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:53:57,776 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test24-2.c [2020-07-20 13:53:57,875 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b92f444ae/e7f162a2022c4b5eadece66dfe37ebb9/FLAG5547547b1 [2020-07-20 13:53:58,467 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:53:58,468 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test24-2.c [2020-07-20 13:53:58,475 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b92f444ae/e7f162a2022c4b5eadece66dfe37ebb9/FLAG5547547b1 [2020-07-20 13:53:58,783 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b92f444ae/e7f162a2022c4b5eadece66dfe37ebb9 [2020-07-20 13:53:58,794 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:53:58,798 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:53:58,800 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:53:58,800 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:53:58,804 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:53:58,806 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:53:58" (1/1) ... [2020-07-20 13:53:58,810 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48c7b11b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:53:58, skipping insertion in model container [2020-07-20 13:53:58,810 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:53:58" (1/1) ... [2020-07-20 13:53:58,819 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:53:58,843 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:53:59,069 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:53:59,082 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:53:59,106 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:53:59,126 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:53:59,126 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:53:59 WrapperNode [2020-07-20 13:53:59,127 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:53:59,128 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:53:59,128 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:53:59,128 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:53:59,232 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:53:59" (1/1) ... [2020-07-20 13:53:59,233 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:53:59" (1/1) ... [2020-07-20 13:53:59,244 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:53:59" (1/1) ... [2020-07-20 13:53:59,245 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:53:59" (1/1) ... [2020-07-20 13:53:59,254 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:53:59" (1/1) ... [2020-07-20 13:53:59,260 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:53:59" (1/1) ... [2020-07-20 13:53:59,262 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:53:59" (1/1) ... [2020-07-20 13:53:59,265 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:53:59,265 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:53:59,266 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:53:59,266 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:53:59,267 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:53:59" (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 13:53:59,336 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:53:59,337 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:53:59,337 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-07-20 13:53:59,337 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:53:59,337 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:53:59,337 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:53:59,337 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-07-20 13:53:59,338 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 13:53:59,338 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:53:59,338 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 13:53:59,338 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 13:53:59,338 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 13:53:59,338 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:53:59,339 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:53:59,644 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:53:59,645 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-07-20 13:53:59,651 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:53:59 BoogieIcfgContainer [2020-07-20 13:53:59,651 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:53:59,653 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:53:59,653 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:53:59,657 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:53:59,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:53:58" (1/3) ... [2020-07-20 13:53:59,659 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dc670b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:53:59, skipping insertion in model container [2020-07-20 13:53:59,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:53:59" (2/3) ... [2020-07-20 13:53:59,659 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1dc670b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:53:59, skipping insertion in model container [2020-07-20 13:53:59,660 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:53:59" (3/3) ... [2020-07-20 13:53:59,662 INFO L109 eAbstractionObserver]: Analyzing ICFG test24-2.c [2020-07-20 13:53:59,676 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:53:59,686 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:53:59,704 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:53:59,741 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:53:59,741 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:53:59,741 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:53:59,741 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:53:59,742 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:53:59,742 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:53:59,742 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:53:59,742 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:53:59,765 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-20 13:53:59,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 13:53:59,773 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:53:59,774 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:53:59,775 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:53:59,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:53:59,783 INFO L82 PathProgramCache]: Analyzing trace with hash 855240046, now seen corresponding path program 1 times [2020-07-20 13:53:59,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:53:59,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [499345336] [2020-07-20 13:53:59,793 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 13:53:59,904 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:53:59,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:53:59,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 13:53:59,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:53:59,939 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 13:53:59,940 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:53:59,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [499345336] [2020-07-20 13:53:59,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:53:59,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 13:53:59,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076482332] [2020-07-20 13:53:59,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 13:53:59,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:53:59,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 13:53:59,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 13:53:59,967 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 2 states. [2020-07-20 13:53:59,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:53:59,994 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-07-20 13:53:59,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 13:53:59,996 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2020-07-20 13:53:59,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:54:00,008 INFO L225 Difference]: With dead ends: 42 [2020-07-20 13:54:00,008 INFO L226 Difference]: Without dead ends: 20 [2020-07-20 13:54:00,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 16 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 13:54:00,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-20 13:54:00,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-20 13:54:00,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-20 13:54:00,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-07-20 13:54:00,059 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-07-20 13:54:00,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:54:00,059 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-07-20 13:54:00,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 13:54:00,060 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-07-20 13:54:00,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 13:54:00,061 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:54:00,061 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:54:00,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:54:00,275 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:54:00,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:54:00,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1631497781, now seen corresponding path program 1 times [2020-07-20 13:54:00,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:54:00,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534079185] [2020-07-20 13:54:00,278 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 13:54:00,350 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:54:00,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:54:00,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 13:54:00,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:54:00,393 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 13:54:00,394 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:54:00,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534079185] [2020-07-20 13:54:00,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:54:00,395 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 13:54:00,395 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700276044] [2020-07-20 13:54:00,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 13:54:00,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:54:00,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 13:54:00,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 13:54:00,399 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 3 states. [2020-07-20 13:54:00,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:54:00,428 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-07-20 13:54:00,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 13:54:00,429 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 13:54:00,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:54:00,431 INFO L225 Difference]: With dead ends: 34 [2020-07-20 13:54:00,431 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 13:54:00,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 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 13:54:00,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 13:54:00,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-07-20 13:54:00,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:54:00,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-20 13:54:00,440 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-07-20 13:54:00,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:54:00,440 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-20 13:54:00,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 13:54:00,441 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-20 13:54:00,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 13:54:00,442 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:54:00,442 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:54:00,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:54:00,652 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:54:00,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:54:00,653 INFO L82 PathProgramCache]: Analyzing trace with hash 1934775405, now seen corresponding path program 1 times [2020-07-20 13:54:00,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:54:00,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [709404274] [2020-07-20 13:54:00,655 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 13:54:00,755 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:54:00,756 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:54:00,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:54:00,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:54:00,798 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 13:54:00,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:54:00,855 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 13:54:00,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [709404274] [2020-07-20 13:54:00,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:54:00,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 13:54:00,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449720674] [2020-07-20 13:54:00,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 13:54:00,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:54:00,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 13:54:00,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:54:00,858 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2020-07-20 13:54:00,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:54:00,900 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2020-07-20 13:54:00,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:54:00,901 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-07-20 13:54:00,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:54:00,902 INFO L225 Difference]: With dead ends: 39 [2020-07-20 13:54:00,902 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 13:54:00,903 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 35 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 13:54:00,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 13:54:00,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-20 13:54:00,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 13:54:00,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-20 13:54:00,910 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 20 [2020-07-20 13:54:00,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:54:00,911 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-20 13:54:00,911 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 13:54:00,911 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-20 13:54:00,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:54:00,912 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:54:00,912 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:54:01,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:54:01,127 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:54:01,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:54:01,128 INFO L82 PathProgramCache]: Analyzing trace with hash 1523652947, now seen corresponding path program 2 times [2020-07-20 13:54:01,128 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:54:01,129 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1709365919] [2020-07-20 13:54:01,129 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 13:54:01,300 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:54:01,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:54:01,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:54:01,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:54:01,357 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 13:54:01,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:54:01,455 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 13:54:01,456 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1709365919] [2020-07-20 13:54:01,456 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:54:01,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 13:54:01,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936962776] [2020-07-20 13:54:01,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:54:01,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:54:01,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:54:01,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:54:01,459 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 12 states. [2020-07-20 13:54:01,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:54:01,531 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2020-07-20 13:54:01,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:54:01,532 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 26 [2020-07-20 13:54:01,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:54:01,533 INFO L225 Difference]: With dead ends: 51 [2020-07-20 13:54:01,533 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 13:54:01,534 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 41 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 13:54:01,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 13:54:01,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-20 13:54:01,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 13:54:01,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-20 13:54:01,542 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 26 [2020-07-20 13:54:01,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:54:01,543 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-20 13:54:01,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:54:01,543 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-20 13:54:01,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-20 13:54:01,544 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:54:01,545 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:54:01,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:54:01,759 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:54:01,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:54:01,760 INFO L82 PathProgramCache]: Analyzing trace with hash 758560159, now seen corresponding path program 3 times [2020-07-20 13:54:01,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:54:01,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812629353] [2020-07-20 13:54:01,761 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 13:54:03,325 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:54:03,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:54:03,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:54:03,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:54:03,483 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 13:54:03,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:54:03,743 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 13:54:03,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812629353] [2020-07-20 13:54:03,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:54:03,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-20 13:54:03,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311981085] [2020-07-20 13:54:03,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:54:03,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:54:03,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:54:03,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:54:03,747 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 22 states. [2020-07-20 13:54:03,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:54:03,906 INFO L93 Difference]: Finished difference Result 71 states and 82 transitions. [2020-07-20 13:54:03,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 13:54:03,908 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 38 [2020-07-20 13:54:03,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:54:03,909 INFO L225 Difference]: With dead ends: 71 [2020-07-20 13:54:03,910 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 13:54:03,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:54:03,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 13:54:03,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-07-20 13:54:03,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-20 13:54:03,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 60 transitions. [2020-07-20 13:54:03,938 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 60 transitions. Word has length 38 [2020-07-20 13:54:03,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:54:03,943 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 60 transitions. [2020-07-20 13:54:03,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:54:03,943 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 60 transitions. [2020-07-20 13:54:03,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-20 13:54:03,949 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:54:03,949 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:54:04,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:54:04,161 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:54:04,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:54:04,162 INFO L82 PathProgramCache]: Analyzing trace with hash -2067273869, now seen corresponding path program 4 times [2020-07-20 13:54:04,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:54:04,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1526745076] [2020-07-20 13:54:04,163 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 14:08:22,577 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 14:08:22,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 14:08:22,577 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.