/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/phases_2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 22:20:22,501 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 22:20:22,504 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 22:20:22,519 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 22:20:22,519 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 22:20:22,520 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 22:20:22,522 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 22:20:22,524 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 22:20:22,525 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 22:20:22,526 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 22:20:22,527 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 22:20:22,528 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 22:20:22,529 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 22:20:22,530 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 22:20:22,531 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 22:20:22,532 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 22:20:22,533 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 22:20:22,534 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 22:20:22,536 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 22:20:22,538 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 22:20:22,540 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 22:20:22,541 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 22:20:22,542 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 22:20:22,543 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 22:20:22,546 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 22:20:22,554 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 22:20:22,555 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 22:20:22,555 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 22:20:22,556 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 22:20:22,572 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 22:20:22,572 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 22:20:22,574 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 22:20:22,574 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 22:20:22,574 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 22:20:22,574 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 22:20:22,574 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 22:20:22,575 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 22:20:22,575 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 22:20:22,575 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 22:20:22,575 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 22:20:22,575 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 22:20:22,576 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 22:20:22,576 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 22:20:22,576 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 22:20:22,576 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 22:20:22,576 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 22:20:22,577 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 22:20:22,577 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 22:20:22,577 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 22:20:22,577 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 22:20:22,578 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:20:22,578 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 22:20:22,578 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 22:20:22,578 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 22:20:22,578 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 22:20:22,579 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:20:22,579 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 22:20:22,579 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 22:20:22,579 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 -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 22:20:22,882 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 22:20:22,897 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 22:20:22,901 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 22:20:22,903 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 22:20:22,903 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 22:20:22,904 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_2-2.c [2020-07-20 22:20:22,976 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2dbe7680/cce0d3acefac4e6b9b30541a29b78ff2/FLAGa6d21fa4b [2020-07-20 22:20:23,479 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 22:20:23,480 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_2-2.c [2020-07-20 22:20:23,488 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2dbe7680/cce0d3acefac4e6b9b30541a29b78ff2/FLAGa6d21fa4b [2020-07-20 22:20:23,882 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f2dbe7680/cce0d3acefac4e6b9b30541a29b78ff2 [2020-07-20 22:20:23,892 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 22:20:23,895 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 22:20:23,896 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 22:20:23,897 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 22:20:23,900 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 22:20:23,902 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:20:23" (1/1) ... [2020-07-20 22:20:23,905 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5e6d448f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:20:23, skipping insertion in model container [2020-07-20 22:20:23,905 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:20:23" (1/1) ... [2020-07-20 22:20:23,913 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 22:20:23,932 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 22:20:24,115 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:20:24,120 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 22:20:24,137 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:20:24,153 INFO L208 MainTranslator]: Completed translation [2020-07-20 22:20:24,153 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:20:24 WrapperNode [2020-07-20 22:20:24,154 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 22:20:24,155 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 22:20:24,155 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 22:20:24,155 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 22:20:24,170 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:20:24" (1/1) ... [2020-07-20 22:20:24,170 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:20:24" (1/1) ... [2020-07-20 22:20:24,176 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:20:24" (1/1) ... [2020-07-20 22:20:24,177 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:20:24" (1/1) ... [2020-07-20 22:20:24,181 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:20:24" (1/1) ... [2020-07-20 22:20:24,187 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:20:24" (1/1) ... [2020-07-20 22:20:24,188 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:20:24" (1/1) ... [2020-07-20 22:20:24,275 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 22:20:24,279 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 22:20:24,279 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 22:20:24,279 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 22:20:24,280 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:20:24" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:20:24,355 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 22:20:24,355 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 22:20:24,355 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 22:20:24,355 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 22:20:24,356 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 22:20:24,356 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 22:20:24,356 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 22:20:24,356 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 22:20:24,356 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 22:20:24,356 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 22:20:24,357 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 22:20:24,357 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 22:20:24,357 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 22:20:24,587 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 22:20:24,587 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 22:20:24,591 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:20:24 BoogieIcfgContainer [2020-07-20 22:20:24,591 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 22:20:24,592 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 22:20:24,592 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 22:20:24,596 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 22:20:24,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:20:23" (1/3) ... [2020-07-20 22:20:24,597 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@696909f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:20:24, skipping insertion in model container [2020-07-20 22:20:24,597 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:20:24" (2/3) ... [2020-07-20 22:20:24,598 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@696909f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:20:24, skipping insertion in model container [2020-07-20 22:20:24,598 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:20:24" (3/3) ... [2020-07-20 22:20:24,600 INFO L109 eAbstractionObserver]: Analyzing ICFG phases_2-2.c [2020-07-20 22:20:24,612 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 22:20:24,620 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 22:20:24,636 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 22:20:24,663 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 22:20:24,663 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 22:20:24,664 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 22:20:24,664 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 22:20:24,664 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 22:20:24,664 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 22:20:24,665 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 22:20:24,665 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 22:20:24,693 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-07-20 22:20:24,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-20 22:20:24,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:20:24,702 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:20:24,703 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:20:24,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:20:24,717 INFO L82 PathProgramCache]: Analyzing trace with hash 900249630, now seen corresponding path program 1 times [2020-07-20 22:20:24,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:20:24,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [821641793] [2020-07-20 22:20:24,740 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:20:24,852 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:20:24,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:20:24,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 25 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 22:20:24,871 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:20:24,900 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:20:24,901 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:20:24,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [821641793] [2020-07-20 22:20:24,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:20:24,904 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 22:20:24,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533398342] [2020-07-20 22:20:24,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 22:20:24,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:20:24,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 22:20:24,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 22:20:24,929 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2020-07-20 22:20:24,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:20:24,957 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-07-20 22:20:24,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 22:20:24,958 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-07-20 22:20:24,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:20:24,969 INFO L225 Difference]: With dead ends: 30 [2020-07-20 22:20:24,970 INFO L226 Difference]: Without dead ends: 13 [2020-07-20 22:20:24,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 22:20:24,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-07-20 22:20:25,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-07-20 22:20:25,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-07-20 22:20:25,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-07-20 22:20:25,020 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2020-07-20 22:20:25,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:20:25,021 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-07-20 22:20:25,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 22:20:25,021 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-07-20 22:20:25,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-20 22:20:25,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:20:25,022 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:20:25,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:20:25,238 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:20:25,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:20:25,239 INFO L82 PathProgramCache]: Analyzing trace with hash 891014420, now seen corresponding path program 1 times [2020-07-20 22:20:25,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:20:25,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2113563280] [2020-07-20 22:20:25,241 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:20:25,272 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:20:25,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:20:25,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 16 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 22:20:25,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:20:25,363 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 22:20:25,416 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:20:25,416 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:20:25,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2113563280] [2020-07-20 22:20:25,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:20:25,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 22:20:25,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [362256139] [2020-07-20 22:20:25,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 22:20:25,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:20:25,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 22:20:25,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-20 22:20:25,421 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 7 states. [2020-07-20 22:20:25,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:20:25,507 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-07-20 22:20:25,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 22:20:25,508 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 11 [2020-07-20 22:20:25,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:20:25,509 INFO L225 Difference]: With dead ends: 20 [2020-07-20 22:20:25,509 INFO L226 Difference]: Without dead ends: 15 [2020-07-20 22:20:25,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-07-20 22:20:25,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-20 22:20:25,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-20 22:20:25,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-20 22:20:25,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-07-20 22:20:25,516 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 11 [2020-07-20 22:20:25,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:20:25,516 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-07-20 22:20:25,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 22:20:25,517 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-07-20 22:20:25,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 22:20:25,518 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:20:25,518 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:20:25,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:20:25,726 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:20:25,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:20:25,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1596010865, now seen corresponding path program 1 times [2020-07-20 22:20:25,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:20:25,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1075038564] [2020-07-20 22:20:25,730 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:20:25,764 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:20:25,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:20:25,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 22:20:25,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:20:25,848 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 22:20:25,893 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:20:25,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:20:25,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:20:26,056 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:20:26,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1075038564] [2020-07-20 22:20:26,061 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-07-20 22:20:26,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 11 [2020-07-20 22:20:26,065 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306384409] [2020-07-20 22:20:26,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 22:20:26,066 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:20:26,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 22:20:26,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 22:20:26,067 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 7 states. [2020-07-20 22:20:32,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:20:32,386 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-07-20 22:20:32,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 22:20:32,387 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-07-20 22:20:32,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:20:32,388 INFO L225 Difference]: With dead ends: 21 [2020-07-20 22:20:32,388 INFO L226 Difference]: Without dead ends: 16 [2020-07-20 22:20:32,389 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2020-07-20 22:20:32,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-20 22:20:32,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-07-20 22:20:32,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-20 22:20:32,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-07-20 22:20:32,394 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 13 [2020-07-20 22:20:32,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:20:32,395 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-07-20 22:20:32,395 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 22:20:32,395 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-07-20 22:20:32,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 22:20:32,396 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:20:32,396 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:20:32,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:20:32,598 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:20:32,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:20:32,598 INFO L82 PathProgramCache]: Analyzing trace with hash 612215820, now seen corresponding path program 1 times [2020-07-20 22:20:32,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:20:32,600 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [575048007] [2020-07-20 22:20:32,600 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