/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 BIGGEST_EQUIVALENCE_CLASS --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/locks/test_locks_7.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 01:05:47,196 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 01:05:47,200 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 01:05:47,228 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 01:05:47,229 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 01:05:47,231 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 01:05:47,233 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 01:05:47,237 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 01:05:47,240 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 01:05:47,241 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 01:05:47,243 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 01:05:47,245 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 01:05:47,246 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 01:05:47,248 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 01:05:47,250 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 01:05:47,252 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 01:05:47,254 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 01:05:47,255 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 01:05:47,257 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 01:05:47,260 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 01:05:47,263 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 01:05:47,265 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 01:05:47,267 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 01:05:47,268 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 01:05:47,273 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 01:05:47,285 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 01:05:47,287 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 01:05:47,288 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 01:05:47,290 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 01:05:47,310 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 01:05:47,311 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 01:05:47,312 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 01:05:47,313 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 01:05:47,313 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 01:05:47,313 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 01:05:47,314 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 01:05:47,314 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 01:05:47,314 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 01:05:47,314 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 01:05:47,315 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 01:05:47,315 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 01:05:47,315 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 01:05:47,315 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 01:05:47,316 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 01:05:47,316 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 01:05:47,316 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 01:05:47,316 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 01:05:47,317 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 01:05:47,317 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 01:05:47,317 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 01:05:47,317 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:05:47,318 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 01:05:47,318 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 01:05:47,318 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 01:05:47,318 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 01:05:47,319 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:47,319 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 01:05:47,319 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 01:05:47,319 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 01:05:47,721 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:05:47,757 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:05:47,767 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:05:47,770 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:05:47,774 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:05:47,776 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_7.c [2020-07-21 01:05:47,900 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/835240808/3f21cb3c983645a0a1f72ad3c44adb6c/FLAGcef8882bd [2020-07-21 01:05:48,689 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:05:48,691 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_7.c [2020-07-21 01:05:48,704 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/835240808/3f21cb3c983645a0a1f72ad3c44adb6c/FLAGcef8882bd [2020-07-21 01:05:49,006 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/835240808/3f21cb3c983645a0a1f72ad3c44adb6c [2020-07-21 01:05:49,022 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:05:49,027 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:05:49,028 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:05:49,029 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:05:49,035 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:05:49,036 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:05:49" (1/1) ... [2020-07-21 01:05:49,042 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@77ac54e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:49, skipping insertion in model container [2020-07-21 01:05:49,042 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:05:49" (1/1) ... [2020-07-21 01:05:49,054 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:05:49,085 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:05:49,517 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:05:49,531 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:05:49,609 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:05:49,664 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:05:49,665 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:49 WrapperNode [2020-07-21 01:05:49,665 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:05:49,666 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:05:49,667 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:05:49,667 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:05:49,829 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:49" (1/1) ... [2020-07-21 01:05:49,834 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:49" (1/1) ... [2020-07-21 01:05:49,856 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:49" (1/1) ... [2020-07-21 01:05:49,857 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:49" (1/1) ... [2020-07-21 01:05:49,878 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:49" (1/1) ... [2020-07-21 01:05:49,897 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:49" (1/1) ... [2020-07-21 01:05:49,902 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:49" (1/1) ... [2020-07-21 01:05:49,911 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:05:49,913 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:05:49,914 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:05:49,914 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:05:49,916 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:49" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:05:49,993 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:05:49,993 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:05:49,993 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:05:49,994 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:05:49,994 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 01:05:49,995 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:05:49,995 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:05:49,995 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:05:50,453 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:05:50,454 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 01:05:50,460 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:05:50 BoogieIcfgContainer [2020-07-21 01:05:50,460 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:05:50,462 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:05:50,463 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:05:50,467 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:05:50,468 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:05:49" (1/3) ... [2020-07-21 01:05:50,469 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@488c867 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:05:50, skipping insertion in model container [2020-07-21 01:05:50,469 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:49" (2/3) ... [2020-07-21 01:05:50,470 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@488c867 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:05:50, skipping insertion in model container [2020-07-21 01:05:50,470 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:05:50" (3/3) ... [2020-07-21 01:05:50,472 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_7.c [2020-07-21 01:05:50,483 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:05:50,491 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:05:50,509 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:05:50,547 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:05:50,547 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:05:50,548 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:05:50,548 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:05:50,548 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:05:50,550 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:05:50,550 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:05:50,550 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:05:50,583 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-07-21 01:05:50,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 01:05:50,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:50,594 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:50,595 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:50,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:50,605 INFO L82 PathProgramCache]: Analyzing trace with hash 1819770524, now seen corresponding path program 1 times [2020-07-21 01:05:50,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:50,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1927340780] [2020-07-21 01:05:50,615 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 [2020-07-21 01:05:50,744 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:50,745 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:50,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:50,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:50,817 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:50,818 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:50,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1927340780] [2020-07-21 01:05:50,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:50,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:50,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22717654] [2020-07-21 01:05:50,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:50,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:50,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:50,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:50,862 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 3 states. [2020-07-21 01:05:50,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:50,951 INFO L93 Difference]: Finished difference Result 69 states and 114 transitions. [2020-07-21 01:05:50,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:50,955 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 01:05:50,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:50,975 INFO L225 Difference]: With dead ends: 69 [2020-07-21 01:05:50,975 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 01:05:50,981 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:51,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 01:05:51,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 38. [2020-07-21 01:05:51,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 01:05:51,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 65 transitions. [2020-07-21 01:05:51,039 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 65 transitions. Word has length 17 [2020-07-21 01:05:51,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:51,039 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 65 transitions. [2020-07-21 01:05:51,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:51,040 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 65 transitions. [2020-07-21 01:05:51,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 01:05:51,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:51,042 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:51,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:51,249 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:51,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:51,250 INFO L82 PathProgramCache]: Analyzing trace with hash 1426743514, now seen corresponding path program 1 times [2020-07-21 01:05:51,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:51,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [854210657] [2020-07-21 01:05:51,251 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 [2020-07-21 01:05:51,320 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:05:51,320 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:51,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:51,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:51,346 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:51,347 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:51,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [854210657] [2020-07-21 01:05:51,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:51,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:51,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374025023] [2020-07-21 01:05:51,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:51,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:51,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:51,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:51,353 INFO L87 Difference]: Start difference. First operand 38 states and 65 transitions. Second operand 3 states. [2020-07-21 01:05:51,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:51,399 INFO L93 Difference]: Finished difference Result 87 states and 152 transitions. [2020-07-21 01:05:51,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:51,400 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-07-21 01:05:51,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:51,403 INFO L225 Difference]: With dead ends: 87 [2020-07-21 01:05:51,403 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 01:05:51,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:51,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 01:05:51,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2020-07-21 01:05:51,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-21 01:05:51,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 89 transitions. [2020-07-21 01:05:51,427 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 89 transitions. Word has length 17 [2020-07-21 01:05:51,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:51,428 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 89 transitions. [2020-07-21 01:05:51,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:51,429 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 89 transitions. [2020-07-21 01:05:51,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 01:05:51,433 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:51,433 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:51,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:51,648 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:51,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:51,650 INFO L82 PathProgramCache]: Analyzing trace with hash 578525748, now seen corresponding path program 1 times [2020-07-21 01:05:51,651 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:51,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [656826986] [2020-07-21 01:05:51,651 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 [2020-07-21 01:05:51,754 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:05:51,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:51,756 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:51,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:51,788 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:51,789 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:51,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [656826986] [2020-07-21 01:05:51,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:51,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:51,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606292518] [2020-07-21 01:05:51,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:51,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:51,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:51,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:51,796 INFO L87 Difference]: Start difference. First operand 52 states and 89 transitions. Second operand 3 states. [2020-07-21 01:05:51,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:51,852 INFO L93 Difference]: Finished difference Result 81 states and 135 transitions. [2020-07-21 01:05:51,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:51,856 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 01:05:51,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:51,860 INFO L225 Difference]: With dead ends: 81 [2020-07-21 01:05:51,860 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 01:05:51,861 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 [2020-07-21 01:05:51,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 01:05:51,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2020-07-21 01:05:51,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 01:05:51,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 91 transitions. [2020-07-21 01:05:51,892 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 91 transitions. Word has length 18 [2020-07-21 01:05:51,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:51,896 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 91 transitions. [2020-07-21 01:05:51,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:51,896 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 91 transitions. [2020-07-21 01:05:51,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 01:05:51,898 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:51,898 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:52,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:52,116 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:52,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:52,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1279590326, now seen corresponding path program 1 times [2020-07-21 01:05:52,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:52,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [354527721] [2020-07-21 01:05:52,118 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 [2020-07-21 01:05:52,190 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:52,191 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:52,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:52,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:52,214 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:52,215 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:52,215 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [354527721] [2020-07-21 01:05:52,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:52,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:52,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920137539] [2020-07-21 01:05:52,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:52,218 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:52,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:52,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:52,220 INFO L87 Difference]: Start difference. First operand 55 states and 91 transitions. Second operand 3 states. [2020-07-21 01:05:52,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:52,250 INFO L93 Difference]: Finished difference Result 100 states and 168 transitions. [2020-07-21 01:05:52,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:52,251 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 01:05:52,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:52,253 INFO L225 Difference]: With dead ends: 100 [2020-07-21 01:05:52,254 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 01:05:52,255 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 [2020-07-21 01:05:52,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 01:05:52,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 72. [2020-07-21 01:05:52,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 01:05:52,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 120 transitions. [2020-07-21 01:05:52,270 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 120 transitions. Word has length 18 [2020-07-21 01:05:52,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:52,271 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 120 transitions. [2020-07-21 01:05:52,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:52,271 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 120 transitions. [2020-07-21 01:05:52,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 01:05:52,272 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:52,273 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:52,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:52,488 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:52,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:52,489 INFO L82 PathProgramCache]: Analyzing trace with hash 886563316, now seen corresponding path program 1 times [2020-07-21 01:05:52,490 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:52,490 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527877843] [2020-07-21 01:05:52,490 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 [2020-07-21 01:05:52,542 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:52,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:52,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:52,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:52,557 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:52,558 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:52,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527877843] [2020-07-21 01:05:52,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:52,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:52,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156517264] [2020-07-21 01:05:52,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:52,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:52,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:52,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:52,562 INFO L87 Difference]: Start difference. First operand 72 states and 120 transitions. Second operand 3 states. [2020-07-21 01:05:52,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:52,601 INFO L93 Difference]: Finished difference Result 164 states and 278 transitions. [2020-07-21 01:05:52,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:52,602 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-21 01:05:52,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:52,604 INFO L225 Difference]: With dead ends: 164 [2020-07-21 01:05:52,605 INFO L226 Difference]: Without dead ends: 100 [2020-07-21 01:05:52,607 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 [2020-07-21 01:05:52,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-21 01:05:52,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 98. [2020-07-21 01:05:52,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-07-21 01:05:52,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 162 transitions. [2020-07-21 01:05:52,622 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 162 transitions. Word has length 18 [2020-07-21 01:05:52,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:52,623 INFO L479 AbstractCegarLoop]: Abstraction has 98 states and 162 transitions. [2020-07-21 01:05:52,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:52,623 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 162 transitions. [2020-07-21 01:05:52,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 01:05:52,625 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:52,625 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:52,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:52,838 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:52,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:52,840 INFO L82 PathProgramCache]: Analyzing trace with hash 1012809135, now seen corresponding path program 1 times [2020-07-21 01:05:52,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:52,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2019190665] [2020-07-21 01:05:52,841 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 [2020-07-21 01:05:52,924 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:52,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:52,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:52,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:52,940 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:52,941 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:52,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2019190665] [2020-07-21 01:05:52,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:52,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:52,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125983531] [2020-07-21 01:05:52,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:52,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:52,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:52,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:52,945 INFO L87 Difference]: Start difference. First operand 98 states and 162 transitions. Second operand 3 states. [2020-07-21 01:05:52,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:52,996 INFO L93 Difference]: Finished difference Result 147 states and 241 transitions. [2020-07-21 01:05:52,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:52,997 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 01:05:52,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:52,999 INFO L225 Difference]: With dead ends: 147 [2020-07-21 01:05:52,999 INFO L226 Difference]: Without dead ends: 102 [2020-07-21 01:05:53,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:53,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-21 01:05:53,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2020-07-21 01:05:53,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-07-21 01:05:53,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 162 transitions. [2020-07-21 01:05:53,027 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 162 transitions. Word has length 19 [2020-07-21 01:05:53,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:53,028 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 162 transitions. [2020-07-21 01:05:53,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:53,028 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 162 transitions. [2020-07-21 01:05:53,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 01:05:53,030 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:53,030 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:53,245 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:53,246 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:53,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:53,247 INFO L82 PathProgramCache]: Analyzing trace with hash 1713873713, now seen corresponding path program 1 times [2020-07-21 01:05:53,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:53,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [224254297] [2020-07-21 01:05:53,249 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 [2020-07-21 01:05:53,306 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:53,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:53,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:53,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:53,321 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:53,322 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:53,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [224254297] [2020-07-21 01:05:53,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:53,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:53,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581374522] [2020-07-21 01:05:53,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:53,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:53,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:53,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:53,328 INFO L87 Difference]: Start difference. First operand 100 states and 162 transitions. Second operand 3 states. [2020-07-21 01:05:53,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:53,362 INFO L93 Difference]: Finished difference Result 180 states and 296 transitions. [2020-07-21 01:05:53,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:53,363 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 01:05:53,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:53,367 INFO L225 Difference]: With dead ends: 180 [2020-07-21 01:05:53,367 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 01:05:53,368 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:53,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 01:05:53,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 136. [2020-07-21 01:05:53,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-21 01:05:53,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 218 transitions. [2020-07-21 01:05:53,408 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 218 transitions. Word has length 19 [2020-07-21 01:05:53,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:53,408 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 218 transitions. [2020-07-21 01:05:53,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:53,410 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 218 transitions. [2020-07-21 01:05:53,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 01:05:53,415 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:53,416 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:53,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:53,622 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:53,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:53,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1320846703, now seen corresponding path program 1 times [2020-07-21 01:05:53,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:53,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1962616880] [2020-07-21 01:05:53,625 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 [2020-07-21 01:05:53,668 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:53,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:53,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:53,672 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:53,689 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:53,690 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:53,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1962616880] [2020-07-21 01:05:53,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:53,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:53,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535098130] [2020-07-21 01:05:53,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:53,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:53,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:53,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:53,693 INFO L87 Difference]: Start difference. First operand 136 states and 218 transitions. Second operand 3 states. [2020-07-21 01:05:53,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:53,720 INFO L93 Difference]: Finished difference Result 312 states and 504 transitions. [2020-07-21 01:05:53,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:53,722 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-21 01:05:53,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:53,724 INFO L225 Difference]: With dead ends: 312 [2020-07-21 01:05:53,724 INFO L226 Difference]: Without dead ends: 186 [2020-07-21 01:05:53,726 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:53,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2020-07-21 01:05:53,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2020-07-21 01:05:53,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-21 01:05:53,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 290 transitions. [2020-07-21 01:05:53,754 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 290 transitions. Word has length 19 [2020-07-21 01:05:53,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:53,755 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 290 transitions. [2020-07-21 01:05:53,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:53,756 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 290 transitions. [2020-07-21 01:05:53,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 01:05:53,757 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:53,758 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] [2020-07-21 01:05:53,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:53,972 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:53,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:53,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1590692585, now seen corresponding path program 1 times [2020-07-21 01:05:53,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:53,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1908856182] [2020-07-21 01:05:53,975 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:54,022 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:54,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:54,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:54,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:54,038 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:54,038 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:54,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1908856182] [2020-07-21 01:05:54,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:54,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:54,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519448810] [2020-07-21 01:05:54,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:54,042 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:54,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:54,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:54,043 INFO L87 Difference]: Start difference. First operand 184 states and 290 transitions. Second operand 3 states. [2020-07-21 01:05:54,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:54,107 INFO L93 Difference]: Finished difference Result 276 states and 432 transitions. [2020-07-21 01:05:54,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:54,108 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 01:05:54,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:54,112 INFO L225 Difference]: With dead ends: 276 [2020-07-21 01:05:54,113 INFO L226 Difference]: Without dead ends: 190 [2020-07-21 01:05:54,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:54,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 190 states. [2020-07-21 01:05:54,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 190 to 188. [2020-07-21 01:05:54,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-21 01:05:54,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 290 transitions. [2020-07-21 01:05:54,162 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 290 transitions. Word has length 20 [2020-07-21 01:05:54,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:54,166 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 290 transitions. [2020-07-21 01:05:54,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:54,166 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 290 transitions. [2020-07-21 01:05:54,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 01:05:54,168 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:54,171 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] [2020-07-21 01:05:54,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:54,374 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:54,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:54,375 INFO L82 PathProgramCache]: Analyzing trace with hash -2003210133, now seen corresponding path program 1 times [2020-07-21 01:05:54,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:54,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1508631255] [2020-07-21 01:05:54,377 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:54,439 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:54,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:54,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:54,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:54,454 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:54,455 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:54,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1508631255] [2020-07-21 01:05:54,455 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:54,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:54,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062138008] [2020-07-21 01:05:54,457 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:54,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:54,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:54,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:54,458 INFO L87 Difference]: Start difference. First operand 188 states and 290 transitions. Second operand 3 states. [2020-07-21 01:05:54,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:54,489 INFO L93 Difference]: Finished difference Result 332 states and 520 transitions. [2020-07-21 01:05:54,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:54,491 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 01:05:54,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:54,494 INFO L225 Difference]: With dead ends: 332 [2020-07-21 01:05:54,494 INFO L226 Difference]: Without dead ends: 330 [2020-07-21 01:05:54,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:54,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2020-07-21 01:05:54,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 264. [2020-07-21 01:05:54,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2020-07-21 01:05:54,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 398 transitions. [2020-07-21 01:05:54,517 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 398 transitions. Word has length 20 [2020-07-21 01:05:54,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:54,518 INFO L479 AbstractCegarLoop]: Abstraction has 264 states and 398 transitions. [2020-07-21 01:05:54,518 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:54,518 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 398 transitions. [2020-07-21 01:05:54,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 01:05:54,520 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:54,521 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] [2020-07-21 01:05:54,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:54,735 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:54,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:54,736 INFO L82 PathProgramCache]: Analyzing trace with hash 1898730153, now seen corresponding path program 1 times [2020-07-21 01:05:54,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:54,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [849290566] [2020-07-21 01:05:54,737 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:54,788 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:54,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:54,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:54,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:54,801 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:54,802 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:54,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [849290566] [2020-07-21 01:05:54,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:54,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:54,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895705455] [2020-07-21 01:05:54,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:54,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:54,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:54,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:54,805 INFO L87 Difference]: Start difference. First operand 264 states and 398 transitions. Second operand 3 states. [2020-07-21 01:05:54,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:54,849 INFO L93 Difference]: Finished difference Result 604 states and 912 transitions. [2020-07-21 01:05:54,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:54,850 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 01:05:54,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:54,853 INFO L225 Difference]: With dead ends: 604 [2020-07-21 01:05:54,853 INFO L226 Difference]: Without dead ends: 354 [2020-07-21 01:05:54,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:54,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2020-07-21 01:05:54,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 352. [2020-07-21 01:05:54,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-21 01:05:54,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 518 transitions. [2020-07-21 01:05:54,876 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 518 transitions. Word has length 20 [2020-07-21 01:05:54,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:54,876 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 518 transitions. [2020-07-21 01:05:54,877 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:54,877 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 518 transitions. [2020-07-21 01:05:54,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 01:05:54,879 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:54,879 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, 1] [2020-07-21 01:05:55,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:55,094 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:55,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:55,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1969756604, now seen corresponding path program 1 times [2020-07-21 01:05:55,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:55,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1322086459] [2020-07-21 01:05:55,097 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 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:55,143 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:05:55,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:55,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:55,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:55,167 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:55,168 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:55,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1322086459] [2020-07-21 01:05:55,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:55,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:55,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847558255] [2020-07-21 01:05:55,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:55,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:55,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:55,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,170 INFO L87 Difference]: Start difference. First operand 352 states and 518 transitions. Second operand 3 states. [2020-07-21 01:05:55,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:55,199 INFO L93 Difference]: Finished difference Result 528 states and 772 transitions. [2020-07-21 01:05:55,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:55,200 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 01:05:55,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:55,204 INFO L225 Difference]: With dead ends: 528 [2020-07-21 01:05:55,205 INFO L226 Difference]: Without dead ends: 362 [2020-07-21 01:05:55,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 362 states. [2020-07-21 01:05:55,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 362 to 360. [2020-07-21 01:05:55,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 360 states. [2020-07-21 01:05:55,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 360 states to 360 states and 518 transitions. [2020-07-21 01:05:55,230 INFO L78 Accepts]: Start accepts. Automaton has 360 states and 518 transitions. Word has length 21 [2020-07-21 01:05:55,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:55,230 INFO L479 AbstractCegarLoop]: Abstraction has 360 states and 518 transitions. [2020-07-21 01:05:55,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:55,231 INFO L276 IsEmpty]: Start isEmpty. Operand 360 states and 518 transitions. [2020-07-21 01:05:55,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 01:05:55,233 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:55,233 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, 1] [2020-07-21 01:05:55,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:55,444 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:55,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:55,445 INFO L82 PathProgramCache]: Analyzing trace with hash -1268692026, now seen corresponding path program 1 times [2020-07-21 01:05:55,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:55,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1855764073] [2020-07-21 01:05:55,446 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 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:55,497 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:55,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:55,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:55,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:55,518 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:55,519 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:55,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1855764073] [2020-07-21 01:05:55,520 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:55,520 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:55,520 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849977834] [2020-07-21 01:05:55,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:55,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:55,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:55,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,523 INFO L87 Difference]: Start difference. First operand 360 states and 518 transitions. Second operand 3 states. [2020-07-21 01:05:55,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:55,557 INFO L93 Difference]: Finished difference Result 620 states and 904 transitions. [2020-07-21 01:05:55,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:55,558 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 01:05:55,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:55,564 INFO L225 Difference]: With dead ends: 620 [2020-07-21 01:05:55,564 INFO L226 Difference]: Without dead ends: 618 [2020-07-21 01:05:55,566 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 618 states. [2020-07-21 01:05:55,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 618 to 520. [2020-07-21 01:05:55,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 520 states. [2020-07-21 01:05:55,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 520 states to 520 states and 726 transitions. [2020-07-21 01:05:55,597 INFO L78 Accepts]: Start accepts. Automaton has 520 states and 726 transitions. Word has length 21 [2020-07-21 01:05:55,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:55,598 INFO L479 AbstractCegarLoop]: Abstraction has 520 states and 726 transitions. [2020-07-21 01:05:55,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:55,598 INFO L276 IsEmpty]: Start isEmpty. Operand 520 states and 726 transitions. [2020-07-21 01:05:55,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 01:05:55,601 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:55,601 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, 1] [2020-07-21 01:05:55,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:55,817 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:55,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:55,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1661719036, now seen corresponding path program 1 times [2020-07-21 01:05:55,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:55,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1305706039] [2020-07-21 01:05:55,819 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 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:55,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:55,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:55,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:55,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:55,935 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:55,936 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:55,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1305706039] [2020-07-21 01:05:55,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:55,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:55,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443951034] [2020-07-21 01:05:55,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:55,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:55,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:55,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,938 INFO L87 Difference]: Start difference. First operand 520 states and 726 transitions. Second operand 3 states. [2020-07-21 01:05:55,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:55,973 INFO L93 Difference]: Finished difference Result 1180 states and 1640 transitions. [2020-07-21 01:05:55,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:55,974 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 01:05:55,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:55,979 INFO L225 Difference]: With dead ends: 1180 [2020-07-21 01:05:55,980 INFO L226 Difference]: Without dead ends: 682 [2020-07-21 01:05:55,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:55,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2020-07-21 01:05:56,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 680. [2020-07-21 01:05:56,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 680 states. [2020-07-21 01:05:56,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 680 states to 680 states and 918 transitions. [2020-07-21 01:05:56,015 INFO L78 Accepts]: Start accepts. Automaton has 680 states and 918 transitions. Word has length 21 [2020-07-21 01:05:56,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:56,015 INFO L479 AbstractCegarLoop]: Abstraction has 680 states and 918 transitions. [2020-07-21 01:05:56,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:56,016 INFO L276 IsEmpty]: Start isEmpty. Operand 680 states and 918 transitions. [2020-07-21 01:05:56,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:05:56,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:56,018 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, 1, 1] [2020-07-21 01:05:56,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:56,233 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:56,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:56,235 INFO L82 PathProgramCache]: Analyzing trace with hash -674531426, now seen corresponding path program 1 times [2020-07-21 01:05:56,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:56,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1288375088] [2020-07-21 01:05:56,236 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:56,291 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:56,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:56,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:56,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:56,322 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:56,322 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:56,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1288375088] [2020-07-21 01:05:56,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:56,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:56,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252875039] [2020-07-21 01:05:56,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:56,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:56,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:56,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:56,328 INFO L87 Difference]: Start difference. First operand 680 states and 918 transitions. Second operand 3 states. [2020-07-21 01:05:56,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:56,374 INFO L93 Difference]: Finished difference Result 1020 states and 1368 transitions. [2020-07-21 01:05:56,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:56,376 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 01:05:56,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:56,385 INFO L225 Difference]: With dead ends: 1020 [2020-07-21 01:05:56,385 INFO L226 Difference]: Without dead ends: 698 [2020-07-21 01:05:56,391 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:56,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 698 states. [2020-07-21 01:05:56,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 698 to 696. [2020-07-21 01:05:56,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 696 states. [2020-07-21 01:05:56,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 696 states to 696 states and 918 transitions. [2020-07-21 01:05:56,439 INFO L78 Accepts]: Start accepts. Automaton has 696 states and 918 transitions. Word has length 22 [2020-07-21 01:05:56,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:56,440 INFO L479 AbstractCegarLoop]: Abstraction has 696 states and 918 transitions. [2020-07-21 01:05:56,440 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:56,441 INFO L276 IsEmpty]: Start isEmpty. Operand 696 states and 918 transitions. [2020-07-21 01:05:56,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:05:56,444 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:56,444 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, 1, 1] [2020-07-21 01:05:56,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:56,660 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:56,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:56,660 INFO L82 PathProgramCache]: Analyzing trace with hash 26533152, now seen corresponding path program 1 times [2020-07-21 01:05:56,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:56,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1752015188] [2020-07-21 01:05:56,662 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:56,731 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:56,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:56,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:56,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:56,743 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:56,744 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:56,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1752015188] [2020-07-21 01:05:56,745 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:56,745 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:56,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966758838] [2020-07-21 01:05:56,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:56,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:56,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:56,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:56,747 INFO L87 Difference]: Start difference. First operand 696 states and 918 transitions. Second operand 3 states. [2020-07-21 01:05:56,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:56,796 INFO L93 Difference]: Finished difference Result 1164 states and 1544 transitions. [2020-07-21 01:05:56,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:56,797 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 01:05:56,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:56,807 INFO L225 Difference]: With dead ends: 1164 [2020-07-21 01:05:56,808 INFO L226 Difference]: Without dead ends: 1162 [2020-07-21 01:05:56,809 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:56,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1162 states. [2020-07-21 01:05:56,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1162 to 1032. [2020-07-21 01:05:56,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1032 states. [2020-07-21 01:05:56,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1032 states to 1032 states and 1318 transitions. [2020-07-21 01:05:56,870 INFO L78 Accepts]: Start accepts. Automaton has 1032 states and 1318 transitions. Word has length 22 [2020-07-21 01:05:56,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:56,870 INFO L479 AbstractCegarLoop]: Abstraction has 1032 states and 1318 transitions. [2020-07-21 01:05:56,870 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:56,870 INFO L276 IsEmpty]: Start isEmpty. Operand 1032 states and 1318 transitions. [2020-07-21 01:05:56,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:05:56,874 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:56,874 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, 1, 1] [2020-07-21 01:05:57,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:57,088 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:57,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:57,089 INFO L82 PathProgramCache]: Analyzing trace with hash -366493858, now seen corresponding path program 1 times [2020-07-21 01:05:57,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:57,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [841305570] [2020-07-21 01:05:57,091 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:57,149 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:57,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:57,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:57,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:57,166 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:57,166 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:57,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [841305570] [2020-07-21 01:05:57,167 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:57,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:57,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [453090888] [2020-07-21 01:05:57,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:57,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:57,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:57,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:57,179 INFO L87 Difference]: Start difference. First operand 1032 states and 1318 transitions. Second operand 3 states. [2020-07-21 01:05:57,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:57,240 INFO L93 Difference]: Finished difference Result 2316 states and 2920 transitions. [2020-07-21 01:05:57,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:57,241 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 01:05:57,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:57,251 INFO L225 Difference]: With dead ends: 2316 [2020-07-21 01:05:57,251 INFO L226 Difference]: Without dead ends: 1322 [2020-07-21 01:05:57,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:57,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1322 states. [2020-07-21 01:05:57,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1322 to 1320. [2020-07-21 01:05:57,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1320 states. [2020-07-21 01:05:57,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1320 states to 1320 states and 1606 transitions. [2020-07-21 01:05:57,340 INFO L78 Accepts]: Start accepts. Automaton has 1320 states and 1606 transitions. Word has length 22 [2020-07-21 01:05:57,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:57,341 INFO L479 AbstractCegarLoop]: Abstraction has 1320 states and 1606 transitions. [2020-07-21 01:05:57,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:57,341 INFO L276 IsEmpty]: Start isEmpty. Operand 1320 states and 1606 transitions. [2020-07-21 01:05:57,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 01:05:57,346 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:57,346 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, 1, 1, 1] [2020-07-21 01:05:57,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:57,562 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:57,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:57,562 INFO L82 PathProgramCache]: Analyzing trace with hash 822743769, now seen corresponding path program 1 times [2020-07-21 01:05:57,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:57,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1587096501] [2020-07-21 01:05:57,567 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:57,621 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:57,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:57,624 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:57,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:57,640 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:57,641 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:57,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1587096501] [2020-07-21 01:05:57,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:57,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:57,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577270708] [2020-07-21 01:05:57,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:57,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:57,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:57,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:57,648 INFO L87 Difference]: Start difference. First operand 1320 states and 1606 transitions. Second operand 3 states. [2020-07-21 01:05:57,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:57,699 INFO L93 Difference]: Finished difference Result 1980 states and 2392 transitions. [2020-07-21 01:05:57,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:57,699 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 01:05:57,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:57,709 INFO L225 Difference]: With dead ends: 1980 [2020-07-21 01:05:57,709 INFO L226 Difference]: Without dead ends: 1354 [2020-07-21 01:05:57,712 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:57,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1354 states. [2020-07-21 01:05:57,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1354 to 1352. [2020-07-21 01:05:57,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1352 states. [2020-07-21 01:05:57,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1352 states to 1352 states and 1606 transitions. [2020-07-21 01:05:57,779 INFO L78 Accepts]: Start accepts. Automaton has 1352 states and 1606 transitions. Word has length 23 [2020-07-21 01:05:57,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:57,780 INFO L479 AbstractCegarLoop]: Abstraction has 1352 states and 1606 transitions. [2020-07-21 01:05:57,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:57,780 INFO L276 IsEmpty]: Start isEmpty. Operand 1352 states and 1606 transitions. [2020-07-21 01:05:57,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 01:05:57,784 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:57,784 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, 1, 1, 1] [2020-07-21 01:05:57,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:57,999 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:58,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:58,000 INFO L82 PathProgramCache]: Analyzing trace with hash 1523808347, now seen corresponding path program 1 times [2020-07-21 01:05:58,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:58,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1773451336] [2020-07-21 01:05:58,001 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:58,074 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:58,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:58,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:58,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:58,100 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:58,101 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:58,101 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1773451336] [2020-07-21 01:05:58,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:58,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:58,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952713474] [2020-07-21 01:05:58,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:58,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:58,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:58,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:58,108 INFO L87 Difference]: Start difference. First operand 1352 states and 1606 transitions. Second operand 3 states. [2020-07-21 01:05:58,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:58,180 INFO L93 Difference]: Finished difference Result 2186 states and 2567 transitions. [2020-07-21 01:05:58,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:58,181 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 01:05:58,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:58,196 INFO L225 Difference]: With dead ends: 2186 [2020-07-21 01:05:58,197 INFO L226 Difference]: Without dead ends: 2184 [2020-07-21 01:05:58,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:58,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2184 states. [2020-07-21 01:05:58,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2184 to 2056. [2020-07-21 01:05:58,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2056 states. [2020-07-21 01:05:58,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2056 states to 2056 states and 2374 transitions. [2020-07-21 01:05:58,301 INFO L78 Accepts]: Start accepts. Automaton has 2056 states and 2374 transitions. Word has length 23 [2020-07-21 01:05:58,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:58,302 INFO L479 AbstractCegarLoop]: Abstraction has 2056 states and 2374 transitions. [2020-07-21 01:05:58,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:58,302 INFO L276 IsEmpty]: Start isEmpty. Operand 2056 states and 2374 transitions. [2020-07-21 01:05:58,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 01:05:58,309 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:58,309 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, 1, 1, 1] [2020-07-21 01:05:58,525 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:58,525 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:58,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:58,526 INFO L82 PathProgramCache]: Analyzing trace with hash 1130781337, now seen corresponding path program 1 times [2020-07-21 01:05:58,526 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:58,527 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2568197] [2020-07-21 01:05:58,527 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:58,578 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:58,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:58,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:58,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:58,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:05:58,598 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:58,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2568197] [2020-07-21 01:05:58,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:58,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:58,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518398123] [2020-07-21 01:05:58,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:58,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:58,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:58,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:58,606 INFO L87 Difference]: Start difference. First operand 2056 states and 2374 transitions. Second operand 3 states. [2020-07-21 01:05:58,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:58,706 INFO L93 Difference]: Finished difference Result 4552 states and 5126 transitions. [2020-07-21 01:05:58,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:58,707 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 01:05:58,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:58,708 INFO L225 Difference]: With dead ends: 4552 [2020-07-21 01:05:58,708 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 01:05:58,719 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:58,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 01:05:58,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 01:05:58,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 01:05:58,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 01:05:58,720 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 23 [2020-07-21 01:05:58,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:58,721 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 01:05:58,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:58,721 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 01:05:58,721 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 01:05:58,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:58,937 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 01:05:59,017 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 01:05:59,017 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 01:05:59,018 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 01:05:59,018 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 01:05:59,018 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 01:05:59,018 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 01:05:59,018 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 121) no Hoare annotation was computed. [2020-07-21 01:05:59,018 INFO L268 CegarLoopResult]: For program point L102(line 102) no Hoare annotation was computed. [2020-07-21 01:05:59,018 INFO L268 CegarLoopResult]: For program point L86-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 01:05:59,019 INFO L271 CegarLoopResult]: At program point L111-1(lines 30 116) the Hoare annotation is: true [2020-07-21 01:05:59,019 INFO L268 CegarLoopResult]: For program point L87(line 87) no Hoare annotation was computed. [2020-07-21 01:05:59,019 INFO L268 CegarLoopResult]: For program point L112(line 112) no Hoare annotation was computed. [2020-07-21 01:05:59,019 INFO L264 CegarLoopResult]: At program point L112-1(lines 5 121) the Hoare annotation is: false [2020-07-21 01:05:59,019 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 121) no Hoare annotation was computed. [2020-07-21 01:05:59,019 INFO L268 CegarLoopResult]: For program point L71-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 01:05:59,020 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 119) no Hoare annotation was computed. [2020-07-21 01:05:59,020 INFO L268 CegarLoopResult]: For program point L96-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 01:05:59,020 INFO L268 CegarLoopResult]: For program point L63-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 01:05:59,020 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 121) the Hoare annotation is: true [2020-07-21 01:05:59,020 INFO L268 CegarLoopResult]: For program point L55-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 01:05:59,020 INFO L268 CegarLoopResult]: For program point L97(line 97) no Hoare annotation was computed. [2020-07-21 01:05:59,021 INFO L268 CegarLoopResult]: For program point L81-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 01:05:59,021 INFO L268 CegarLoopResult]: For program point L106-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 01:05:59,021 INFO L268 CegarLoopResult]: For program point L32(lines 32 34) no Hoare annotation was computed. [2020-07-21 01:05:59,021 INFO L268 CegarLoopResult]: For program point L82(line 82) no Hoare annotation was computed. [2020-07-21 01:05:59,023 INFO L268 CegarLoopResult]: For program point L107(line 107) no Hoare annotation was computed. [2020-07-21 01:05:59,023 INFO L268 CegarLoopResult]: For program point L91-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 01:05:59,023 INFO L268 CegarLoopResult]: For program point L75-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 01:05:59,023 INFO L268 CegarLoopResult]: For program point L67-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 01:05:59,023 INFO L268 CegarLoopResult]: For program point L92(line 92) no Hoare annotation was computed. [2020-07-21 01:05:59,024 INFO L268 CegarLoopResult]: For program point L59-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 01:05:59,024 INFO L271 CegarLoopResult]: At program point L117(lines 5 121) the Hoare annotation is: true [2020-07-21 01:05:59,024 INFO L268 CegarLoopResult]: For program point L51(lines 51 53) no Hoare annotation was computed. [2020-07-21 01:05:59,024 INFO L268 CegarLoopResult]: For program point L51-2(lines 30 116) no Hoare annotation was computed. [2020-07-21 01:05:59,024 INFO L268 CegarLoopResult]: For program point L101-1(lines 30 116) no Hoare annotation was computed. [2020-07-21 01:05:59,047 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:05:59 BoogieIcfgContainer [2020-07-21 01:05:59,047 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 01:05:59,051 INFO L168 Benchmark]: Toolchain (without parser) took 10024.97 ms. Allocated memory was 143.1 MB in the beginning and 253.2 MB in the end (delta: 110.1 MB). Free memory was 99.7 MB in the beginning and 150.8 MB in the end (delta: -51.1 MB). Peak memory consumption was 59.0 MB. Max. memory is 7.1 GB. [2020-07-21 01:05:59,052 INFO L168 Benchmark]: CDTParser took 1.46 ms. Allocated memory is still 143.1 MB. Free memory was 118.1 MB in the beginning and 117.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-21 01:05:59,053 INFO L168 Benchmark]: CACSL2BoogieTranslator took 637.66 ms. Allocated memory is still 143.1 MB. Free memory was 99.3 MB in the beginning and 89.0 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-07-21 01:05:59,053 INFO L168 Benchmark]: Boogie Preprocessor took 244.55 ms. Allocated memory was 143.1 MB in the beginning and 201.3 MB in the end (delta: 58.2 MB). Free memory was 89.0 MB in the beginning and 179.5 MB in the end (delta: -90.4 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-21 01:05:59,054 INFO L168 Benchmark]: RCFGBuilder took 547.19 ms. Allocated memory is still 201.3 MB. Free memory was 179.5 MB in the beginning and 162.8 MB in the end (delta: 16.7 MB). Peak memory consumption was 16.7 MB. Max. memory is 7.1 GB. [2020-07-21 01:05:59,054 INFO L168 Benchmark]: TraceAbstraction took 8584.64 ms. Allocated memory was 201.3 MB in the beginning and 253.2 MB in the end (delta: 51.9 MB). Free memory was 162.8 MB in the beginning and 150.8 MB in the end (delta: 12.0 MB). Peak memory consumption was 63.9 MB. Max. memory is 7.1 GB. [2020-07-21 01:05:59,057 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.46 ms. Allocated memory is still 143.1 MB. Free memory was 118.1 MB in the beginning and 117.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 637.66 ms. Allocated memory is still 143.1 MB. Free memory was 99.3 MB in the beginning and 89.0 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 244.55 ms. Allocated memory was 143.1 MB in the beginning and 201.3 MB in the end (delta: 58.2 MB). Free memory was 89.0 MB in the beginning and 179.5 MB in the end (delta: -90.4 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 547.19 ms. Allocated memory is still 201.3 MB. Free memory was 179.5 MB in the beginning and 162.8 MB in the end (delta: 16.7 MB). Peak memory consumption was 16.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8584.64 ms. Allocated memory was 201.3 MB in the beginning and 253.2 MB in the end (delta: 51.9 MB). Free memory was 162.8 MB in the beginning and 150.8 MB in the end (delta: 12.0 MB). Peak memory consumption was 63.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 119]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 30]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 35 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 8.3s, OverallIterations: 20, TraceHistogramMax: 1, AutomataDifference: 1.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1238 SDtfs, 574 SDslu, 829 SDs, 0 SdLazy, 107 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 383 GetRequests, 363 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=2056occurred in iteration=19, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.7s AutomataMinimizationTime, 20 MinimizatonAttempts, 530 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 138 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 403 NumberOfCodeBlocks, 395 NumberOfCodeBlocksAsserted, 77 NumberOfCheckSat, 383 ConstructedInterpolants, 0 QuantifiedInterpolants, 13856 SizeOfPredicates, 0 NumberOfNonLiveVariables, 1674 ConjunctsInSsa, 60 ConjunctsInUnsatCore, 20 InterpolantComputations, 20 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...