/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/recursive-simple/id_o100.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:37:58,730 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:37:58,733 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:37:58,753 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 21:37:58,782 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:37:58,786 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:37:58,791 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:37:58,793 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:37:58,795 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:37:58,796 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:37:58,798 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:37:58,803 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:37:58,808 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:37:58,813 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:37:58,815 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:37:58,815 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:37:58,818 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:37:58,828 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:37:58,829 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:37:58,830 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:37:58,831 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 21:37:58,850 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:37:58,851 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:37:58,852 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:37:58,852 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:37:58,852 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:37:58,853 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:37:58,853 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:37:58,853 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:37:58,853 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:37:58,853 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:37:58,854 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:37:58,854 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:37:58,854 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:37:58,854 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:37:58,854 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:37:58,855 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:37:58,855 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:37:58,855 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:37:58,855 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:37:58,855 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:37:58,856 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:37:58,856 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:37:58,856 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:37:58,856 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:37:58,856 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:37:58,857 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:37:58,857 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:37:58,857 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:37:58,857 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:37:58,858 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 21:37:59,168 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:37:59,182 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:37:59,185 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:37:59,187 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:37:59,188 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:37:59,188 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-20 21:37:59,269 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62ba1b4d4/4480c694db524c0fb017d612e2c78220/FLAG96fc4a875 [2020-07-20 21:37:59,718 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:37:59,719 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o100.c [2020-07-20 21:37:59,725 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62ba1b4d4/4480c694db524c0fb017d612e2c78220/FLAG96fc4a875 [2020-07-20 21:38:00,092 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/62ba1b4d4/4480c694db524c0fb017d612e2c78220 [2020-07-20 21:38:00,103 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:38:00,105 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:38:00,106 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:38:00,107 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:38:00,111 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:38:00,112 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:38:00" (1/1) ... [2020-07-20 21:38:00,115 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@755de7c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:38:00, skipping insertion in model container [2020-07-20 21:38:00,116 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:38:00" (1/1) ... [2020-07-20 21:38:00,124 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:38:00,139 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:38:00,315 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:38:00,321 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:38:00,344 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:38:00,366 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:38:00,367 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:38:00 WrapperNode [2020-07-20 21:38:00,367 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:38:00,368 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:38:00,368 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:38:00,368 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:38:00,388 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:38:00" (1/1) ... [2020-07-20 21:38:00,390 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:38:00" (1/1) ... [2020-07-20 21:38:00,397 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:38:00" (1/1) ... [2020-07-20 21:38:00,397 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:38:00" (1/1) ... [2020-07-20 21:38:00,402 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:38:00" (1/1) ... [2020-07-20 21:38:00,406 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:38:00" (1/1) ... [2020-07-20 21:38:00,407 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:38:00" (1/1) ... [2020-07-20 21:38:00,409 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:38:00,411 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:38:00,411 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:38:00,411 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:38:00,412 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:38:00" (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 21:38:00,580 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:38:00,581 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:38:00,581 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 21:38:00,581 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:38:00,581 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 21:38:00,582 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:38:00,582 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 21:38:00,583 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:38:00,583 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:38:00,583 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:38:00,745 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:38:00,746 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:38:00,750 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:38:00 BoogieIcfgContainer [2020-07-20 21:38:00,750 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:38:00,752 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:38:00,752 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:38:00,755 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:38:00,756 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:38:00" (1/3) ... [2020-07-20 21:38:00,757 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@578ca516 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:38:00, skipping insertion in model container [2020-07-20 21:38:00,757 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:38:00" (2/3) ... [2020-07-20 21:38:00,757 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@578ca516 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:38:00, skipping insertion in model container [2020-07-20 21:38:00,758 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:38:00" (3/3) ... [2020-07-20 21:38:00,759 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o100.c [2020-07-20 21:38:00,771 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:38:00,778 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:38:00,794 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:38:00,819 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:38:00,819 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:38:00,819 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:38:00,820 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:38:00,820 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:38:00,820 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:38:00,820 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:38:00,820 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:38:00,843 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 21:38:00,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:38:00,851 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:38:00,852 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:38:00,853 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:38:00,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:38:00,859 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 21:38:00,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:38:00,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [823115620] [2020-07-20 21:38:00,870 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 21:38:00,947 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:38:00,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:38:00,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:38:00,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:38:01,047 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 21:38:01,048 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:38:01,049 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [823115620] [2020-07-20 21:38:01,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:38:01,050 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:38:01,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522607712] [2020-07-20 21:38:01,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:38:01,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:38:01,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:38:01,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:38:01,076 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 21:38:01,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:38:01,126 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-20 21:38:01,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:38:01,129 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:38:01,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:38:01,141 INFO L225 Difference]: With dead ends: 32 [2020-07-20 21:38:01,141 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 21:38:01,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:38:01,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 21:38:01,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 21:38:01,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 21:38:01,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 21:38:01,190 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 21:38:01,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:38:01,191 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 21:38:01,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:38:01,191 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 21:38:01,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 21:38:01,193 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:38:01,194 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:38:01,408 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:38:01,409 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:38:01,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:38:01,411 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 21:38:01,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:38:01,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [84964098] [2020-07-20 21:38:01,412 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 21:38:01,462 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:38:01,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:38:01,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 21:38:01,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:38:01,553 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 21:38:01,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:38:01,745 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 21:38:01,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [84964098] [2020-07-20 21:38:01,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:38:01,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 21:38:01,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704087863] [2020-07-20 21:38:01,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:38:01,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:38:01,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:38:01,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:38:01,751 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-20 21:38:01,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:38:01,842 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-20 21:38:01,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:38:01,843 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-20 21:38:01,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:38:01,845 INFO L225 Difference]: With dead ends: 30 [2020-07-20 21:38:01,845 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 21:38:01,846 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:38:01,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 21:38:01,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 21:38:01,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 21:38:01,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 21:38:01,854 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-20 21:38:01,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:38:01,854 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 21:38:01,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:38:01,854 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 21:38:01,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 21:38:01,856 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:38:01,856 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:38:02,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:38:02,071 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:38:02,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:38:02,073 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-20 21:38:02,073 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:38:02,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1808209239] [2020-07-20 21:38:02,075 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 21:38:02,136 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:38:02,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:38:02,138 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 21:38:02,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:38:02,240 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 21:38:02,241 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:38:02,714 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 21:38:02,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1808209239] [2020-07-20 21:38:02,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:38:02,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-20 21:38:02,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435751146] [2020-07-20 21:38:02,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 21:38:02,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:38:02,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 21:38:02,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:38:02,718 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-20 21:38:03,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:38:03,063 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-20 21:38:03,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 21:38:03,063 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-20 21:38:03,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:38:03,065 INFO L225 Difference]: With dead ends: 42 [2020-07-20 21:38:03,065 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 21:38:03,066 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2020-07-20 21:38:03,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 21:38:03,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 21:38:03,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:38:03,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-20 21:38:03,075 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-20 21:38:03,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:38:03,076 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-20 21:38:03,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 21:38:03,076 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-20 21:38:03,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 21:38:03,078 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:38:03,078 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:38:03,292 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:38:03,293 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:38:03,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:38:03,295 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-20 21:38:03,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:38:03,296 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [615998477] [2020-07-20 21:38:03,296 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:38:03,344 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:38:03,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:38:03,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 21:38:03,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:38:03,607 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 21:38:03,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:38:11,397 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 72 refuted. 5 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 21:38:11,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [615998477] [2020-07-20 21:38:11,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:38:11,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-20 21:38:11,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479389643] [2020-07-20 21:38:11,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 21:38:11,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:38:11,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 21:38:11,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1073, Unknown=3, NotChecked=0, Total=1260 [2020-07-20 21:38:11,401 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-20 21:38:14,635 WARN L193 SmtUtils]: Spent 2.19 s on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-20 21:38:15,423 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-20 21:38:18,144 WARN L193 SmtUtils]: Spent 2.14 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-20 21:38:31,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:38:31,648 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-20 21:38:31,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 21:38:31,650 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-20 21:38:31,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:38:31,653 INFO L225 Difference]: With dead ends: 66 [2020-07-20 21:38:31,653 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 21:38:31,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 23.1s TimeCoverageRelationStatistics Valid=382, Invalid=1871, Unknown=3, NotChecked=0, Total=2256 [2020-07-20 21:38:31,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 21:38:31,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-20 21:38:31,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 21:38:31,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-20 21:38:31,667 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-20 21:38:31,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:38:31,668 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-20 21:38:31,668 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 21:38:31,668 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-20 21:38:31,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-20 21:38:31,672 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:38:31,672 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:38:31,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:38:31,876 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:38:31,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:38:31,877 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-20 21:38:31,878 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:38:31,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1544858397] [2020-07-20 21:38:31,879 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:38:32,388 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:38:32,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:38:32,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-20 21:38:32,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:38:33,104 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 21:38:33,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:38:38,470 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 21:38:38,471 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1544858397] [2020-07-20 21:38:38,471 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:38:38,471 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-20 21:38:38,471 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174133664] [2020-07-20 21:38:38,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-20 21:38:38,473 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:38:38,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-20 21:38:38,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3940, Unknown=0, NotChecked=0, Total=4556 [2020-07-20 21:38:38,476 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-20 21:38:55,990 WARN L193 SmtUtils]: Spent 13.09 s on a formula simplification that was a NOOP. DAG size: 93 [2020-07-20 21:39:21,612 WARN L193 SmtUtils]: Spent 17.69 s on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 21:39:43,266 WARN L193 SmtUtils]: Spent 14.30 s on a formula simplification that was a NOOP. DAG size: 87 [2020-07-20 21:40:04,652 WARN L193 SmtUtils]: Spent 15.44 s on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 21:40:17,562 WARN L193 SmtUtils]: Spent 8.11 s on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 21:40:30,546 WARN L193 SmtUtils]: Spent 9.59 s on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 21:40:35,853 WARN L193 SmtUtils]: Spent 2.84 s on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 21:40:44,139 WARN L193 SmtUtils]: Spent 5.63 s on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 21:40:54,128 WARN L193 SmtUtils]: Spent 7.71 s on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 21:40:58,045 WARN L193 SmtUtils]: Spent 1.66 s on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 21:41:01,276 WARN L193 SmtUtils]: Spent 1.13 s on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 21:41:04,127 WARN L193 SmtUtils]: Spent 892.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:41:06,719 WARN L193 SmtUtils]: Spent 795.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 21:41:15,006 WARN L193 SmtUtils]: Spent 6.62 s on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 21:41:16,611 WARN L193 SmtUtils]: Spent 351.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:41:18,469 WARN L193 SmtUtils]: Spent 751.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:41:19,593 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:41:21,490 WARN L193 SmtUtils]: Spent 989.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 21:41:22,361 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 21:41:23,583 WARN L193 SmtUtils]: Spent 341.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:41:28,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:41:28,905 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-20 21:41:28,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-20 21:41:28,907 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-20 21:41:28,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:41:28,912 INFO L225 Difference]: With dead ends: 114 [2020-07-20 21:41:28,912 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 21:41:28,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 683 ImplicationChecksByTransitivity, 171.7s TimeCoverageRelationStatistics Valid=1526, Invalid=7592, Unknown=2, NotChecked=0, Total=9120 [2020-07-20 21:41:28,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 21:41:28,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-20 21:41:28,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 21:41:28,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-20 21:41:28,933 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-20 21:41:28,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:41:28,934 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-20 21:41:28,934 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-20 21:41:28,934 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-20 21:41:28,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-20 21:41:28,938 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:41:28,938 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:41:29,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:41:29,144 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:41:29,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:41:29,145 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-20 21:41:29,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:41:29,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1626750729] [2020-07-20 21:41:29,147 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:41:42,261 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:41:42,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:41:42,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-20 21:41:42,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:41:46,446 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-20 21:41:46,447 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:44:06,411 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1419 refuted. 38 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-20 21:44:06,412 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1626750729] [2020-07-20 21:44:06,412 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:44:06,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-20 21:44:06,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132787659] [2020-07-20 21:44:06,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-20 21:44:06,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:44:06,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-20 21:44:06,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=14994, Unknown=50, NotChecked=0, Total=17292 [2020-07-20 21:44:06,422 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-20 21:45:06,369 WARN L193 SmtUtils]: Spent 4.49 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-20 21:46:04,136 WARN L193 SmtUtils]: Spent 8.54 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-20 21:47:05,433 WARN L193 SmtUtils]: Spent 5.85 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-20 21:48:04,951 WARN L193 SmtUtils]: Spent 7.03 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-20 21:49:00,186 WARN L193 SmtUtils]: Spent 5.06 s on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-20 21:49:56,131 WARN L193 SmtUtils]: Spent 6.42 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-20 21:51:00,671 WARN L193 SmtUtils]: Spent 6.21 s on a formula simplification. DAG size of input: 143 DAG size of output: 13 [2020-07-20 21:51:51,222 WARN L193 SmtUtils]: Spent 3.81 s on a formula simplification. DAG size of input: 141 DAG size of output: 11 [2020-07-20 21:52:39,270 WARN L193 SmtUtils]: Spent 7.55 s on a formula simplification. DAG size of input: 138 DAG size of output: 13