/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/bitvector-loops/diamond_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:28:12,986 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:28:12,988 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:28:13,006 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:28:13,007 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:28:13,009 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:28:13,010 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:28:13,014 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:28:13,018 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:28:13,019 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:28:13,028 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:28:13,029 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:28:13,030 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:28:13,030 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:28:13,033 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:28:13,034 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:28:13,035 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:28:13,036 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:28:13,039 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:28:13,041 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:28:13,045 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:28:13,046 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:28:13,049 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:28:13,049 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:28:13,052 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:28:13,066 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:28:13,067 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:28:13,069 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:28:13,069 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 16:28:13,092 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:28:13,093 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:28:13,094 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:28:13,095 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:28:13,095 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:28:13,095 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:28:13,095 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:28:13,095 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:28:13,096 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:28:13,096 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:28:13,097 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:28:13,097 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:28:13,097 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:28:13,098 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:28:13,098 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:28:13,098 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:28:13,098 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:28:13,099 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:28:13,099 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:28:13,099 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:28:13,099 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:28:13,099 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:28:13,100 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:28:13,100 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:28:13,100 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:28:13,100 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:28:13,100 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:13,101 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:28:13,101 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:28:13,101 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:28:13,396 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:28:13,409 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:28:13,412 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:28:13,413 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:28:13,413 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:28:13,414 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector-loops/diamond_2-1.c [2020-07-20 16:28:13,472 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf3245b04/d4737af6c37a428a904366b5490ff2e0/FLAGad1222a81 [2020-07-20 16:28:13,911 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:28:13,912 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector-loops/diamond_2-1.c [2020-07-20 16:28:13,925 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf3245b04/d4737af6c37a428a904366b5490ff2e0/FLAGad1222a81 [2020-07-20 16:28:14,267 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bf3245b04/d4737af6c37a428a904366b5490ff2e0 [2020-07-20 16:28:14,278 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:28:14,282 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:28:14,283 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:28:14,283 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:28:14,287 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:28:14,288 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:28:14" (1/1) ... [2020-07-20 16:28:14,291 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a5e6636 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:14, skipping insertion in model container [2020-07-20 16:28:14,291 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:28:14" (1/1) ... [2020-07-20 16:28:14,300 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:28:14,318 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:28:14,501 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:28:14,506 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:28:14,530 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:28:14,545 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:28:14,545 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:14 WrapperNode [2020-07-20 16:28:14,545 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:28:14,546 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:28:14,546 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:28:14,546 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:28:14,648 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:14" (1/1) ... [2020-07-20 16:28:14,649 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:14" (1/1) ... [2020-07-20 16:28:14,659 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:14" (1/1) ... [2020-07-20 16:28:14,659 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:14" (1/1) ... [2020-07-20 16:28:14,665 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:14" (1/1) ... [2020-07-20 16:28:14,671 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:14" (1/1) ... [2020-07-20 16:28:14,672 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:14" (1/1) ... [2020-07-20 16:28:14,674 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:28:14,675 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:28:14,675 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:28:14,675 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:28:14,676 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:14" (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 16:28:14,745 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:28:14,745 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:28:14,745 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 16:28:14,745 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:28:14,746 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:28:14,746 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 16:28:14,746 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 16:28:14,746 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:28:14,747 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:28:14,747 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:28:15,022 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:28:15,023 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 16:28:15,026 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:28:15 BoogieIcfgContainer [2020-07-20 16:28:15,027 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:28:15,028 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:28:15,028 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:28:15,031 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:28:15,032 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:28:14" (1/3) ... [2020-07-20 16:28:15,032 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50ecda00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:28:15, skipping insertion in model container [2020-07-20 16:28:15,033 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:28:14" (2/3) ... [2020-07-20 16:28:15,033 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50ecda00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:28:15, skipping insertion in model container [2020-07-20 16:28:15,033 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:28:15" (3/3) ... [2020-07-20 16:28:15,035 INFO L109 eAbstractionObserver]: Analyzing ICFG diamond_2-1.c [2020-07-20 16:28:15,045 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:28:15,053 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:28:15,067 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:28:15,088 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:28:15,088 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:28:15,088 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:28:15,088 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:28:15,088 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:28:15,089 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:28:15,089 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:28:15,089 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:28:15,105 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-20 16:28:15,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 16:28:15,111 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:15,112 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:15,112 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:15,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:15,119 INFO L82 PathProgramCache]: Analyzing trace with hash 1906239810, now seen corresponding path program 1 times [2020-07-20 16:28:15,128 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:15,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1409288005] [2020-07-20 16:28:15,128 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 16:28:15,248 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:28:15,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:15,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 16:28:15,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:15,282 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 16:28:15,283 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:28:15,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1409288005] [2020-07-20 16:28:15,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:28:15,285 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 16:28:15,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870381609] [2020-07-20 16:28:15,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 16:28:15,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:15,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 16:28:15,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 16:28:15,305 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-20 16:28:15,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:15,330 INFO L93 Difference]: Finished difference Result 38 states and 51 transitions. [2020-07-20 16:28:15,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 16:28:15,332 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-20 16:28:15,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:15,340 INFO L225 Difference]: With dead ends: 38 [2020-07-20 16:28:15,340 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 16:28:15,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 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 16:28:15,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 16:28:15,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 16:28:15,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 16:28:15,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 31 transitions. [2020-07-20 16:28:15,384 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 31 transitions. Word has length 10 [2020-07-20 16:28:15,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:15,385 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 31 transitions. [2020-07-20 16:28:15,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 16:28:15,385 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 31 transitions. [2020-07-20 16:28:15,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 16:28:15,386 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:15,386 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:28:15,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:15,602 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:15,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:15,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1847134466, now seen corresponding path program 1 times [2020-07-20 16:28:15,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:15,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [251470293] [2020-07-20 16:28:15,605 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 16:28:15,655 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:28:15,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:15,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 16:28:15,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:15,681 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 16:28:15,681 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:28:15,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [251470293] [2020-07-20 16:28:15,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:28:15,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 16:28:15,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001665702] [2020-07-20 16:28:15,684 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 16:28:15,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:15,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 16:28:15,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 16:28:15,686 INFO L87 Difference]: Start difference. First operand 21 states and 31 transitions. Second operand 3 states. [2020-07-20 16:28:15,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:15,785 INFO L93 Difference]: Finished difference Result 28 states and 39 transitions. [2020-07-20 16:28:15,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 16:28:15,786 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-20 16:28:15,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:15,789 INFO L225 Difference]: With dead ends: 28 [2020-07-20 16:28:15,789 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 16:28:15,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 16:28:15,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 16:28:15,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2020-07-20 16:28:15,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 16:28:15,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 32 transitions. [2020-07-20 16:28:15,798 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 32 transitions. Word has length 10 [2020-07-20 16:28:15,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:15,799 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 32 transitions. [2020-07-20 16:28:15,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 16:28:15,799 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 32 transitions. [2020-07-20 16:28:15,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 16:28:15,800 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:15,800 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] [2020-07-20 16:28:16,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:16,015 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:16,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:16,016 INFO L82 PathProgramCache]: Analyzing trace with hash -129940435, now seen corresponding path program 1 times [2020-07-20 16:28:16,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:16,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1020134806] [2020-07-20 16:28:16,018 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 16:28:16,067 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:28:16,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:16,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 16:28:16,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:16,125 INFO L501 QuantifierPusher]: Distributing 3 conjuncts over 3 disjuncts [2020-07-20 16:28:16,128 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 16:28:16,132 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 16:28:16,138 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 16:28:16,156 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 16:28:16,156 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:28:16,157 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1020134806] [2020-07-20 16:28:16,157 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:28:16,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 16:28:16,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428306109] [2020-07-20 16:28:16,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 16:28:16,158 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:16,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 16:28:16,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 16:28:16,159 INFO L87 Difference]: Start difference. First operand 22 states and 32 transitions. Second operand 3 states. [2020-07-20 16:28:16,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:28:16,248 INFO L93 Difference]: Finished difference Result 50 states and 81 transitions. [2020-07-20 16:28:16,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 16:28:16,249 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 16:28:16,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:28:16,251 INFO L225 Difference]: With dead ends: 50 [2020-07-20 16:28:16,251 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 16:28:16,252 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 [2020-07-20 16:28:16,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 16:28:16,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-07-20 16:28:16,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 16:28:16,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2020-07-20 16:28:16,259 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 21 [2020-07-20 16:28:16,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:28:16,260 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2020-07-20 16:28:16,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 16:28:16,260 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2020-07-20 16:28:16,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 16:28:16,261 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:28:16,261 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] [2020-07-20 16:28:16,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:28:16,477 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:28:16,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:28:16,478 INFO L82 PathProgramCache]: Analyzing trace with hash 263086575, now seen corresponding path program 1 times [2020-07-20 16:28:16,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:28:16,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1942577544] [2020-07-20 16:28:16,480 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 16:28:16,529 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:28:16,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:28:16,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 16:28:16,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:28:16,689 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 16:28:16,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:28:21,942 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 16:28:21,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1942577544] [2020-07-20 16:28:21,943 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:28:21,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 16:28:21,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632270485] [2020-07-20 16:28:21,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 16:28:21,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:28:21,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 16:28:21,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=384, Unknown=2, NotChecked=0, Total=552 [2020-07-20 16:28:21,952 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand 24 states. [2020-07-20 16:28:22,486 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-20 16:28:33,948 WARN L193 SmtUtils]: Spent 2.31 s on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-20 16:28:45,344 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-20 16:28:48,670 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-20 16:28:56,698 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-20 16:29:16,734 WARN L193 SmtUtils]: Spent 670.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-20 16:29:30,613 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-20 16:29:40,818 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-20 16:29:54,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:29:54,263 INFO L93 Difference]: Finished difference Result 119 states and 140 transitions. [2020-07-20 16:29:54,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 16:29:54,263 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 21 [2020-07-20 16:29:54,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:29:54,265 INFO L225 Difference]: With dead ends: 119 [2020-07-20 16:29:54,265 INFO L226 Difference]: Without dead ends: 114 [2020-07-20 16:29:54,267 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 19 SyntacticMatches, 8 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 35.6s TimeCoverageRelationStatistics Valid=614, Invalid=1102, Unknown=6, NotChecked=0, Total=1722 [2020-07-20 16:29:54,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-20 16:29:54,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 56. [2020-07-20 16:29:54,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 16:29:54,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 69 transitions. [2020-07-20 16:29:54,277 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 69 transitions. Word has length 21 [2020-07-20 16:29:54,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:29:54,277 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 69 transitions. [2020-07-20 16:29:54,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 16:29:54,278 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 69 transitions. [2020-07-20 16:29:54,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 16:29:54,279 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:29:54,279 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] [2020-07-20 16:29:54,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:29:54,493 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:29:54,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:29:54,494 INFO L82 PathProgramCache]: Analyzing trace with hash -402778255, now seen corresponding path program 1 times [2020-07-20 16:29:54,494 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:29:54,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1744387060] [2020-07-20 16:29:54,496 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 16:29:54,521 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:29:54,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:29:54,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 16:29:54,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:29:54,548 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:29:54,549 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 16:29:54,564 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 16:29:54,565 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:29:54,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1744387060] [2020-07-20 16:29:54,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:29:54,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 16:29:54,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118222774] [2020-07-20 16:29:54,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 16:29:54,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:29:54,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 16:29:54,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 16:29:54,567 INFO L87 Difference]: Start difference. First operand 56 states and 69 transitions. Second operand 3 states. [2020-07-20 16:29:54,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:29:54,644 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-20 16:29:54,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 16:29:54,645 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-20 16:29:54,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:29:54,646 INFO L225 Difference]: With dead ends: 83 [2020-07-20 16:29:54,646 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 16:29:54,647 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 [2020-07-20 16:29:54,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 16:29:54,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2020-07-20 16:29:54,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 16:29:54,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2020-07-20 16:29:54,654 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 21 [2020-07-20 16:29:54,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:29:54,654 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2020-07-20 16:29:54,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 16:29:54,655 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2020-07-20 16:29:54,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 16:29:54,655 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:29:54,656 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] [2020-07-20 16:29:54,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:29:54,870 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:29:54,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:29:54,871 INFO L82 PathProgramCache]: Analyzing trace with hash -345519953, now seen corresponding path program 1 times [2020-07-20 16:29:54,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:29:54,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2028000021] [2020-07-20 16:29:54,871 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 16:29:54,898 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:29:54,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 16:29:54,899 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:29:54,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 16:29:54,908 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:29:54,919 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 16:29:54,920 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 16:29:55,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:29:55,151 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:29:55 BoogieIcfgContainer [2020-07-20 16:29:55,151 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:29:55,152 INFO L168 Benchmark]: Toolchain (without parser) took 100872.52 ms. Allocated memory was 143.7 MB in the beginning and 251.7 MB in the end (delta: 108.0 MB). Free memory was 101.7 MB in the beginning and 165.6 MB in the end (delta: -63.9 MB). Peak memory consumption was 43.9 MB. Max. memory is 7.1 GB. [2020-07-20 16:29:55,153 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 143.7 MB. Free memory was 119.9 MB in the beginning and 119.6 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-20 16:29:55,155 INFO L168 Benchmark]: CACSL2BoogieTranslator took 262.97 ms. Allocated memory is still 143.7 MB. Free memory was 101.3 MB in the beginning and 91.1 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-07-20 16:29:55,155 INFO L168 Benchmark]: Boogie Preprocessor took 128.51 ms. Allocated memory was 143.7 MB in the beginning and 201.3 MB in the end (delta: 57.7 MB). Free memory was 91.1 MB in the beginning and 179.4 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-07-20 16:29:55,156 INFO L168 Benchmark]: RCFGBuilder took 351.83 ms. Allocated memory is still 201.3 MB. Free memory was 179.4 MB in the beginning and 163.2 MB in the end (delta: 16.1 MB). Peak memory consumption was 16.1 MB. Max. memory is 7.1 GB. [2020-07-20 16:29:55,157 INFO L168 Benchmark]: TraceAbstraction took 100122.83 ms. Allocated memory was 201.3 MB in the beginning and 251.7 MB in the end (delta: 50.3 MB). Free memory was 162.5 MB in the beginning and 165.6 MB in the end (delta: -3.1 MB). Peak memory consumption was 47.2 MB. Max. memory is 7.1 GB. [2020-07-20 16:29:55,161 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 143.7 MB. Free memory was 119.9 MB in the beginning and 119.6 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 262.97 ms. Allocated memory is still 143.7 MB. Free memory was 101.3 MB in the beginning and 91.1 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 128.51 ms. Allocated memory was 143.7 MB in the beginning and 201.3 MB in the end (delta: 57.7 MB). Free memory was 91.1 MB in the beginning and 179.4 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 351.83 ms. Allocated memory is still 201.3 MB. Free memory was 179.4 MB in the beginning and 163.2 MB in the end (delta: 16.1 MB). Peak memory consumption was 16.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 100122.83 ms. Allocated memory was 201.3 MB in the beginning and 251.7 MB in the end (delta: 50.3 MB). Free memory was 162.5 MB in the beginning and 165.6 MB in the end (delta: -3.1 MB). Peak memory consumption was 47.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] unsigned int x = 0; [L13] unsigned int y = __VERIFIER_nondet_uint(); [L15] COND TRUE x < 99 VAL [x=0, y=3] [L16] COND FALSE !(y % 2 == 0) [L17] x += 2 VAL [x=2, y=3] [L19] COND FALSE !(y % 2 == 0) [L20] x -= 2 VAL [x=0, y=3] [L22] COND FALSE !(y % 2 == 0) [L23] x += 2 VAL [x=2, y=3] [L25] COND FALSE !(y % 2 == 0) [L26] x -= 2 VAL [x=0, y=3] [L28] COND FALSE !(y % 2 == 0) [L29] x += 2 VAL [x=2, y=3] [L31] COND FALSE !(y % 2 == 0) [L32] x -= 4 VAL [x=4294967294, y=3] [L34] COND FALSE !(y % 2 == 0) [L35] x += 4 VAL [x=2, y=3] [L37] COND FALSE !(y % 2 == 0) [L38] x += 2 VAL [x=4, y=3] [L40] COND FALSE !(y % 2 == 0) [L41] x -= 4 VAL [x=0, y=3] [L43] COND FALSE !(y % 2 == 0) [L44] x -= 4 VAL [x=4294967292, y=3] [L15] COND FALSE !(x < 99) VAL [x=4294967292, y=3] [L47] CALL __VERIFIER_assert((x % 2) == (y % 2)) VAL [\old(cond)=0] [L5] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L6] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 100.0s, OverallIterations: 6, TraceHistogramMax: 1, AutomataDifference: 92.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 121 SDtfs, 53 SDslu, 136 SDs, 0 SdLazy, 700 SolverSat, 421 SolverUnsat, 29 SolverUnknown, 0 SolverNotchecked, 60.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 125 GetRequests, 74 SyntacticMatches, 8 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 35.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=4, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 62 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 5.6s InterpolantComputationTime, 104 NumberOfCodeBlocks, 84 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 98 ConstructedInterpolants, 0 QuantifiedInterpolants, 4960 SizeOfPredicates, 4 NumberOfNonLiveVariables, 201 ConjunctsInSsa, 31 ConjunctsInUnsatCore, 6 InterpolantComputations, 4 PerfectInterpolantSequences, 2/4 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 incorrect! Received shutdown request...