/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:43:49,449 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:43:49,452 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:43:49,465 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:43:49,465 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:43:49,467 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:43:49,468 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:43:49,470 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:43:49,472 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:43:49,473 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:43:49,474 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:43:49,475 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:43:49,475 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:43:49,476 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:43:49,478 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:43:49,479 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:43:49,480 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:43:49,481 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:43:49,482 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:43:49,485 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:43:49,486 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:43:49,487 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:43:49,489 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:43:49,489 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:43:49,492 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:43:49,500 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:43:49,501 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:43:49,502 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:43:49,503 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 17:43:49,518 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:43:49,519 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:43:49,520 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:43:49,520 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:43:49,521 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:43:49,521 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:43:49,521 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:43:49,521 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:43:49,521 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:43:49,522 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:43:49,522 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:43:49,522 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:43:49,522 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:43:49,522 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:43:49,523 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:43:49,523 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:43:49,523 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:43:49,523 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:43:49,523 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:43:49,524 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:43:49,524 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:43:49,524 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:43:49,524 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:43:49,524 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:43:49,524 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:43:49,525 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:43:49,525 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:49,525 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:43:49,525 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:43:49,525 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:43:49,868 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:43:49,882 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:43:49,885 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:43:49,887 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:43:49,887 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:43:49,888 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-07-20 17:43:49,971 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7ac5649ee/cc46551e7de744a6b57b1f4b739dcbc4/FLAG644797cb3 [2020-07-20 17:43:50,504 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:43:50,505 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-07-20 17:43:50,514 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7ac5649ee/cc46551e7de744a6b57b1f4b739dcbc4/FLAG644797cb3 [2020-07-20 17:43:50,837 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7ac5649ee/cc46551e7de744a6b57b1f4b739dcbc4 [2020-07-20 17:43:50,846 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:43:50,849 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:43:50,850 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:43:50,850 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:43:50,854 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:43:50,855 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:43:50" (1/1) ... [2020-07-20 17:43:50,858 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5957ebad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:50, skipping insertion in model container [2020-07-20 17:43:50,859 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:43:50" (1/1) ... [2020-07-20 17:43:50,867 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:43:50,886 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:43:51,096 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:43:51,101 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:43:51,122 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:43:51,145 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:43:51,146 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51 WrapperNode [2020-07-20 17:43:51,146 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:43:51,147 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:43:51,147 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:43:51,147 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:43:51,163 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,163 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,265 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,266 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,274 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,280 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,281 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... [2020-07-20 17:43:51,283 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:43:51,288 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:43:51,289 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:43:51,289 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:43:51,290 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:43:51,359 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:43:51,359 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:43:51,359 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:43:51,359 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:43:51,359 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:43:51,360 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:43:51,360 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:43:51,360 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 17:43:51,360 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 17:43:51,360 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 17:43:51,360 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 17:43:51,361 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:43:51,361 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:43:51,593 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:43:51,594 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:43:51,604 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:43:51 BoogieIcfgContainer [2020-07-20 17:43:51,605 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:43:51,606 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:43:51,606 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:43:51,611 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:43:51,615 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:43:50" (1/3) ... [2020-07-20 17:43:51,616 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17b31c15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:43:51, skipping insertion in model container [2020-07-20 17:43:51,616 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:43:51" (2/3) ... [2020-07-20 17:43:51,616 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@17b31c15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:43:51, skipping insertion in model container [2020-07-20 17:43:51,616 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:43:51" (3/3) ... [2020-07-20 17:43:51,621 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-07-20 17:43:51,652 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:43:51,667 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:43:51,701 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:43:51,752 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:43:51,752 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:43:51,752 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:43:51,753 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:43:51,753 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:43:51,753 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:43:51,754 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:43:51,754 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:43:51,782 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-20 17:43:51,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 17:43:51,790 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:51,792 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:51,792 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:51,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:51,799 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-07-20 17:43:51,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:51,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [506358728] [2020-07-20 17:43:51,812 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:51,897 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:51,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:51,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 17:43:51,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:51,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:51,929 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:43:51,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [506358728] [2020-07-20 17:43:51,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:43:51,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 17:43:51,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162673480] [2020-07-20 17:43:51,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 17:43:51,939 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:51,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 17:43:51,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:43:51,958 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-07-20 17:43:51,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:51,985 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-07-20 17:43:51,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 17:43:51,987 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-07-20 17:43:51,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:51,996 INFO L225 Difference]: With dead ends: 34 [2020-07-20 17:43:51,997 INFO L226 Difference]: Without dead ends: 14 [2020-07-20 17:43:52,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:43:52,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-20 17:43:52,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-20 17:43:52,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-20 17:43:52,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-20 17:43:52,040 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-20 17:43:52,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:52,041 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-20 17:43:52,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 17:43:52,041 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-20 17:43:52,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 17:43:52,042 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:52,042 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:52,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:52,257 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:52,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:52,258 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-07-20 17:43:52,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:52,259 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1620388431] [2020-07-20 17:43:52,259 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:52,327 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:52,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:52,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 17:43:52,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:52,367 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:52,368 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:43:52,368 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1620388431] [2020-07-20 17:43:52,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:43:52,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:43:52,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1773186807] [2020-07-20 17:43:52,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:43:52,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:52,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:43:52,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:43:52,373 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 3 states. [2020-07-20 17:43:52,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:52,395 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-07-20 17:43:52,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:43:52,396 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-07-20 17:43:52,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:52,397 INFO L225 Difference]: With dead ends: 22 [2020-07-20 17:43:52,397 INFO L226 Difference]: Without dead ends: 16 [2020-07-20 17:43:52,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:43:52,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-20 17:43:52,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-07-20 17:43:52,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-20 17:43:52,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-20 17:43:52,405 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-07-20 17:43:52,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:52,405 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-20 17:43:52,405 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:43:52,405 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-20 17:43:52,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 17:43:52,406 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:52,407 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:52,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:52,621 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:52,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:52,622 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-07-20 17:43:52,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:52,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1392896142] [2020-07-20 17:43:52,624 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:52,683 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:43:52,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:52,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:43:52,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:52,716 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:52,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:52,765 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:52,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1392896142] [2020-07-20 17:43:52,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:52,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 17:43:52,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081228085] [2020-07-20 17:43:52,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:43:52,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:52,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:43:52,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:43:52,769 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 6 states. [2020-07-20 17:43:52,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:52,822 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2020-07-20 17:43:52,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:43:52,823 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 14 [2020-07-20 17:43:52,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:52,824 INFO L225 Difference]: With dead ends: 27 [2020-07-20 17:43:52,824 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 17:43:52,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:43:52,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 17:43:52,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 17:43:52,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 17:43:52,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-07-20 17:43:52,831 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2020-07-20 17:43:52,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:52,831 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-07-20 17:43:52,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:43:52,832 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-20 17:43:52,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 17:43:52,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:52,833 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:53,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:53,046 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:53,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:53,047 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 2 times [2020-07-20 17:43:53,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:53,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [935408122] [2020-07-20 17:43:53,048 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:53,111 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:53,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:53,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 17:43:53,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:53,171 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:53,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:53,265 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:53,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [935408122] [2020-07-20 17:43:53,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:53,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 17:43:53,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468142960] [2020-07-20 17:43:53,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 17:43:53,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:53,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 17:43:53,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:43:53,269 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 12 states. [2020-07-20 17:43:53,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:53,340 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-07-20 17:43:53,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 17:43:53,341 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 20 [2020-07-20 17:43:53,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:53,342 INFO L225 Difference]: With dead ends: 39 [2020-07-20 17:43:53,342 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 17:43:53,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:43:53,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 17:43:53,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 17:43:53,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 17:43:53,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-20 17:43:53,352 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2020-07-20 17:43:53,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:53,352 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-20 17:43:53,353 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 17:43:53,353 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-20 17:43:53,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-20 17:43:53,354 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:53,354 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:53,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:53,569 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:53,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:53,570 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 3 times [2020-07-20 17:43:53,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:53,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [603408516] [2020-07-20 17:43:53,572 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:53,793 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:53,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:53,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 17:43:53,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:53,932 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:53,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:54,223 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:54,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [603408516] [2020-07-20 17:43:54,224 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:54,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 17:43:54,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822151242] [2020-07-20 17:43:54,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 17:43:54,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:54,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 17:43:54,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 17:43:54,227 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 24 states. [2020-07-20 17:43:54,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:54,339 INFO L93 Difference]: Finished difference Result 63 states and 74 transitions. [2020-07-20 17:43:54,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 17:43:54,340 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 32 [2020-07-20 17:43:54,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:54,341 INFO L225 Difference]: With dead ends: 63 [2020-07-20 17:43:54,342 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 17:43:54,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-07-20 17:43:54,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 17:43:54,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-20 17:43:54,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-20 17:43:54,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-07-20 17:43:54,352 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 32 [2020-07-20 17:43:54,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:54,353 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-07-20 17:43:54,353 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 17:43:54,353 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-07-20 17:43:54,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-20 17:43:54,355 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:54,355 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:54,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:54,569 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:54,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:54,569 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 4 times [2020-07-20 17:43:54,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:54,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [525594034] [2020-07-20 17:43:54,571 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:55,903 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:43:55,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:43:55,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 17:43:55,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:43:56,343 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:56,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:43:57,335 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:43:57,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [525594034] [2020-07-20 17:43:57,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:43:57,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-20 17:43:57,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647532127] [2020-07-20 17:43:57,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-20 17:43:57,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:43:57,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-20 17:43:57,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 17:43:57,340 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 48 states. [2020-07-20 17:43:57,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:43:57,611 INFO L93 Difference]: Finished difference Result 111 states and 134 transitions. [2020-07-20 17:43:57,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 17:43:57,614 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 56 [2020-07-20 17:43:57,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:43:57,618 INFO L225 Difference]: With dead ends: 111 [2020-07-20 17:43:57,619 INFO L226 Difference]: Without dead ends: 105 [2020-07-20 17:43:57,621 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 17:43:57,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-20 17:43:57,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2020-07-20 17:43:57,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-07-20 17:43:57,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-07-20 17:43:57,650 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 56 [2020-07-20 17:43:57,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:43:57,651 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-07-20 17:43:57,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-20 17:43:57,652 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-07-20 17:43:57,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-07-20 17:43:57,661 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:43:57,661 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:43:57,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:43:57,876 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:43:57,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:43:57,877 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 5 times [2020-07-20 17:43:57,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:43:57,878 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [306322071] [2020-07-20 17:43:57,878 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:46:08,140 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:46:08,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:46:08,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-20 17:46:08,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:46:10,379 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:46:10,380 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:46:14,233 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:46:14,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [306322071] [2020-07-20 17:46:14,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:46:14,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-20 17:46:14,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929820514] [2020-07-20 17:46:14,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-20 17:46:14,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:46:14,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-20 17:46:14,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 17:46:14,245 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 96 states. [2020-07-20 17:46:14,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:46:14,731 INFO L93 Difference]: Finished difference Result 207 states and 254 transitions. [2020-07-20 17:46:14,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-20 17:46:14,732 INFO L78 Accepts]: Start accepts. Automaton has 96 states. Word has length 104 [2020-07-20 17:46:14,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:46:14,737 INFO L225 Difference]: With dead ends: 207 [2020-07-20 17:46:14,738 INFO L226 Difference]: Without dead ends: 201 [2020-07-20 17:46:14,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=4560, Invalid=4560, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 17:46:14,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2020-07-20 17:46:14,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 201. [2020-07-20 17:46:14,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2020-07-20 17:46:14,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 201 transitions. [2020-07-20 17:46:14,781 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 201 transitions. Word has length 104 [2020-07-20 17:46:14,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:46:14,782 INFO L479 AbstractCegarLoop]: Abstraction has 201 states and 201 transitions. [2020-07-20 17:46:14,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 96 states. [2020-07-20 17:46:14,782 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 201 transitions. [2020-07-20 17:46:14,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2020-07-20 17:46:14,795 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:46:14,795 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:46:14,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:46:14,996 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:46:14,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:46:14,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1695638553, now seen corresponding path program 6 times [2020-07-20 17:46:14,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:46:14,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [949393391] [2020-07-20 17:46:14,998 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in