/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 --traceabstraction.trace.refinement.strategy CAMEL_SMT_AM -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-79ed534 [2020-07-20 06:06:48,294 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 06:06:48,297 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 06:06:48,317 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 06:06:48,317 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 06:06:48,320 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 06:06:48,322 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 06:06:48,332 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 06:06:48,336 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 06:06:48,341 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 06:06:48,342 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 06:06:48,344 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 06:06:48,344 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 06:06:48,346 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 06:06:48,347 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 06:06:48,348 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 06:06:48,352 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 06:06:48,353 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 06:06:48,355 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 06:06:48,361 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 06:06:48,365 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 06:06:48,366 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 06:06:48,368 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 06:06:48,369 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 06:06:48,372 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 06:06:48,390 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 06:06:48,391 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 06:06:48,391 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 06:06:48,392 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 06:06:48,409 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 06:06:48,410 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 06:06:48,411 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 06:06:48,411 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 06:06:48,412 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 06:06:48,412 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 06:06:48,412 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 06:06:48,412 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 06:06:48,413 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 06:06:48,413 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 06:06:48,413 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 06:06:48,413 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 06:06:48,414 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 06:06:48,414 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 06:06:48,414 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 06:06:48,414 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 06:06:48,414 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 06:06:48,415 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 06:06:48,415 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 06:06:48,415 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 06:06:48,415 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 06:06:48,415 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 06:06:48,416 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 06:06:48,416 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 06:06:48,416 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 06:06:48,416 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 06:06:48,417 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 06:06:48,417 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 06:06:48,417 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 06:06:48,417 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> CAMEL_SMT_AM [2020-07-20 06:06:48,735 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 06:06:48,750 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 06:06:48,754 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 06:06:48,755 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 06:06:48,756 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 06:06:48,756 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2020-07-20 06:06:48,840 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c12b6ffda/c9188f77678d4c99bf4e4c083d6b2c0b/FLAG3053dd920 [2020-07-20 06:06:49,598 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 06:06:49,599 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2020-07-20 06:06:49,612 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c12b6ffda/c9188f77678d4c99bf4e4c083d6b2c0b/FLAG3053dd920 [2020-07-20 06:06:49,920 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c12b6ffda/c9188f77678d4c99bf4e4c083d6b2c0b [2020-07-20 06:06:49,938 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 06:06:49,944 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 06:06:49,948 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 06:06:49,949 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 06:06:49,956 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 06:06:49,959 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:06:49" (1/1) ... [2020-07-20 06:06:49,964 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20a602aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:06:49, skipping insertion in model container [2020-07-20 06:06:49,965 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 06:06:49" (1/1) ... [2020-07-20 06:06:49,979 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 06:06:50,009 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 06:06:50,291 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 06:06:50,297 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 06:06:50,327 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 06:06:50,355 INFO L208 MainTranslator]: Completed translation [2020-07-20 06:06:50,357 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:06:50 WrapperNode [2020-07-20 06:06:50,357 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 06:06:50,360 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 06:06:50,360 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 06:06:50,361 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 06:06:50,503 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:06:50" (1/1) ... [2020-07-20 06:06:50,504 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:06:50" (1/1) ... [2020-07-20 06:06:50,519 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:06:50" (1/1) ... [2020-07-20 06:06:50,520 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:06:50" (1/1) ... [2020-07-20 06:06:50,534 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:06:50" (1/1) ... [2020-07-20 06:06:50,542 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:06:50" (1/1) ... [2020-07-20 06:06:50,544 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:06:50" (1/1) ... [2020-07-20 06:06:50,548 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 06:06:50,550 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 06:06:50,550 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 06:06:50,550 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 06:06:50,554 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:06:50" (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 06:06:50,644 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 06:06:50,645 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 06:06:50,645 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 06:06:50,645 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 06:06:50,645 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 06:06:50,646 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 06:06:50,646 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 06:06:50,646 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 06:06:50,646 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 06:06:50,647 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 06:06:50,647 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 06:06:50,647 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 06:06:50,647 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 06:06:50,647 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 06:06:50,647 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 06:06:50,648 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 06:06:50,648 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 06:06:51,121 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 06:06:51,122 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-07-20 06:06:51,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:06:51 BoogieIcfgContainer [2020-07-20 06:06:51,134 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 06:06:51,138 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 06:06:51,139 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 06:06:51,149 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 06:06:51,151 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 06:06:49" (1/3) ... [2020-07-20 06:06:51,154 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7cda9ad0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:06:51, skipping insertion in model container [2020-07-20 06:06:51,154 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 06:06:50" (2/3) ... [2020-07-20 06:06:51,157 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7cda9ad0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 06:06:51, skipping insertion in model container [2020-07-20 06:06:51,157 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 06:06:51" (3/3) ... [2020-07-20 06:06:51,163 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-07-20 06:06:51,193 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-20 06:06:51,213 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 06:06:51,242 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 06:06:51,303 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 06:06:51,304 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 06:06:51,304 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-20 06:06:51,305 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 06:06:51,305 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 06:06:51,305 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 06:06:51,305 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 06:06:51,305 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 06:06:51,339 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-07-20 06:06:51,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 06:06:51,350 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 06:06:51,352 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 06:06:51,354 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 06:06:51,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 06:06:51,363 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-07-20 06:06:51,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 06:06:51,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82101093] [2020-07-20 06:06:51,377 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5b540b01 [2020-07-20 06:06:51,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 06:06:51,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 06:06:51,693 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 06:06:51,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82101093] [2020-07-20 06:06:51,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 06:06:51,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 06:06:51,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333708692] [2020-07-20 06:06:51,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 06:06:51,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 06:06:51,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 06:06:51,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 06:06:51,735 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 4 states. [2020-07-20 06:06:52,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 06:06:52,110 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2020-07-20 06:06:52,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 06:06:52,114 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-07-20 06:06:52,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 06:06:52,135 INFO L225 Difference]: With dead ends: 73 [2020-07-20 06:06:52,135 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 06:06:52,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 06:06:52,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 06:06:52,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-07-20 06:06:52,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 06:06:52,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-07-20 06:06:52,234 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2020-07-20 06:06:52,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 06:06:52,235 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-07-20 06:06:52,235 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 06:06:52,236 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-07-20 06:06:52,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 06:06:52,238 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 06:06:52,238 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 06:06:52,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-20 06:06:52,239 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 06:06:52,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 06:06:52,240 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-07-20 06:06:52,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 06:06:52,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977329921] [2020-07-20 06:06:52,242 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5b540b01 [2020-07-20 06:06:52,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 06:06:52,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 06:06:52,365 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 06:06:52,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977329921] [2020-07-20 06:06:52,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1196516329] [2020-07-20 06:06:52,368 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@51739071 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 06:06:52,490 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@51739071 issued 3 check-sat command(s) [2020-07-20 06:06:52,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 06:06:52,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 06:06:52,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 06:06:52,565 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 06:06:52,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 06:06:52,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2020-07-20 06:06:52,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596425247] [2020-07-20 06:06:52,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 06:06:52,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 06:06:52,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 06:06:52,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-07-20 06:06:52,572 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 6 states. [2020-07-20 06:06:52,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 06:06:52,834 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-07-20 06:06:52,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 06:06:52,836 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-07-20 06:06:52,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 06:06:52,838 INFO L225 Difference]: With dead ends: 65 [2020-07-20 06:06:52,839 INFO L226 Difference]: Without dead ends: 44 [2020-07-20 06:06:52,843 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-07-20 06:06:52,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-20 06:06:52,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2020-07-20 06:06:52,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 06:06:52,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-07-20 06:06:52,858 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2020-07-20 06:06:52,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 06:06:52,859 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-07-20 06:06:52,859 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 06:06:52,859 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-07-20 06:06:52,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-20 06:06:52,861 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 06:06:52,861 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 06:06:53,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-07-20 06:06:53,077 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 06:06:53,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 06:06:53,078 INFO L82 PathProgramCache]: Analyzing trace with hash 1067646812, now seen corresponding path program 2 times [2020-07-20 06:06:53,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 06:06:53,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978860825] [2020-07-20 06:06:53,080 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5b540b01 [2020-07-20 06:06:53,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 06:06:53,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 06:06:53,315 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 06:06:53,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978860825] [2020-07-20 06:06:53,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266104780] [2020-07-20 06:06:53,318 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@4cf1fc94 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 06:06:53,406 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@4cf1fc94 issued 3 check-sat command(s) [2020-07-20 06:06:53,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 06:06:53,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 06:06:53,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 06:06:53,444 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 06:06:53,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 06:06:53,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2020-07-20 06:06:53,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443174700] [2020-07-20 06:06:53,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 06:06:53,448 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 06:06:53,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 06:06:53,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-20 06:06:53,451 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 7 states. [2020-07-20 06:06:53,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 06:06:53,699 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2020-07-20 06:06:53,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 06:06:53,701 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 32 [2020-07-20 06:06:53,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 06:06:53,704 INFO L225 Difference]: With dead ends: 75 [2020-07-20 06:06:53,705 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 06:06:53,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-07-20 06:06:53,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 06:06:53,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2020-07-20 06:06:53,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-20 06:06:53,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-07-20 06:06:53,718 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2020-07-20 06:06:53,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 06:06:53,719 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-07-20 06:06:53,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 06:06:53,719 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-07-20 06:06:53,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-07-20 06:06:53,721 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 06:06:53,721 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 06:06:53,935 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 06:06:53,936 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 06:06:53,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 06:06:53,937 INFO L82 PathProgramCache]: Analyzing trace with hash -1245957476, now seen corresponding path program 3 times [2020-07-20 06:06:53,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 06:06:53,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [991272060] [2020-07-20 06:06:53,939 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5b540b01 [2020-07-20 06:06:53,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 06:06:54,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 06:06:54,049 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-07-20 06:06:54,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [991272060] [2020-07-20 06:06:54,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [862361910] [2020-07-20 06:06:54,052 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3ed573b0 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 06:06:54,144 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@3ed573b0 issued 3 check-sat command(s) [2020-07-20 06:06:54,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 06:06:54,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 06:06:54,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 06:06:54,170 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-07-20 06:06:54,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 06:06:54,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2020-07-20 06:06:54,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838457521] [2020-07-20 06:06:54,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 06:06:54,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 06:06:54,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 06:06:54,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-07-20 06:06:54,173 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 8 states. [2020-07-20 06:06:54,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 06:06:54,320 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2020-07-20 06:06:54,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 06:06:54,320 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2020-07-20 06:06:54,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 06:06:54,322 INFO L225 Difference]: With dead ends: 85 [2020-07-20 06:06:54,322 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 06:06:54,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-07-20 06:06:54,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 06:06:54,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-07-20 06:06:54,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 06:06:54,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-07-20 06:06:54,331 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2020-07-20 06:06:54,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 06:06:54,332 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-07-20 06:06:54,332 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 06:06:54,332 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-07-20 06:06:54,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 06:06:54,334 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 06:06:54,334 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 06:06:54,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 06:06:54,550 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 06:06:54,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 06:06:54,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1106103076, now seen corresponding path program 4 times [2020-07-20 06:06:54,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 06:06:54,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673019666] [2020-07-20 06:06:54,552 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5b540b01 [2020-07-20 06:06:54,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 06:06:54,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 06:06:54,665 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 06:06:54,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673019666] [2020-07-20 06:06:54,666 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1428279193] [2020-07-20 06:06:54,666 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7b3d1fec No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 06:06:54,794 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@7b3d1fec issued 3 check-sat command(s) [2020-07-20 06:06:54,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 06:06:54,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 06:06:54,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 06:06:54,819 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 06:06:54,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 06:06:54,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2020-07-20 06:06:54,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258437705] [2020-07-20 06:06:54,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 06:06:54,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 06:06:54,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 06:06:54,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-07-20 06:06:54,822 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 9 states. [2020-07-20 06:06:55,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 06:06:55,043 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2020-07-20 06:06:55,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 06:06:55,044 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 40 [2020-07-20 06:06:55,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 06:06:55,046 INFO L225 Difference]: With dead ends: 93 [2020-07-20 06:06:55,046 INFO L226 Difference]: Without dead ends: 66 [2020-07-20 06:06:55,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-07-20 06:06:55,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-20 06:06:55,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-07-20 06:06:55,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 06:06:55,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-07-20 06:06:55,059 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2020-07-20 06:06:55,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 06:06:55,061 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-07-20 06:06:55,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 06:06:55,062 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-07-20 06:06:55,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-20 06:06:55,064 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 06:06:55,064 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 06:06:55,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 06:06:55,278 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 06:06:55,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 06:06:55,279 INFO L82 PathProgramCache]: Analyzing trace with hash 1061537308, now seen corresponding path program 5 times [2020-07-20 06:06:55,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 06:06:55,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2116711237] [2020-07-20 06:06:55,281 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5b540b01 [2020-07-20 06:06:55,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 06:06:55,367 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 06:06:55,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 06:06:55,416 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 06:06:55,475 INFO L174 FreeRefinementEngine]: Strategy CAMEL_SMT_AM found a feasible trace [2020-07-20 06:06:55,475 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 06:06:55,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-07-20 06:06:55,582 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 06:06:55 BoogieIcfgContainer [2020-07-20 06:06:55,583 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 06:06:55,592 INFO L168 Benchmark]: Toolchain (without parser) took 5646.67 ms. Allocated memory was 137.4 MB in the beginning and 248.0 MB in the end (delta: 110.6 MB). Free memory was 102.1 MB in the beginning and 212.0 MB in the end (delta: -109.9 MB). Peak memory consumption was 727.4 kB. Max. memory is 7.1 GB. [2020-07-20 06:06:55,600 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 137.4 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-20 06:06:55,601 INFO L168 Benchmark]: CACSL2BoogieTranslator took 410.39 ms. Allocated memory is still 137.4 MB. Free memory was 101.7 MB in the beginning and 91.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. [2020-07-20 06:06:55,602 INFO L168 Benchmark]: Boogie Preprocessor took 188.95 ms. Allocated memory was 137.4 MB in the beginning and 202.9 MB in the end (delta: 65.5 MB). Free memory was 91.0 MB in the beginning and 179.9 MB in the end (delta: -88.9 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-20 06:06:55,606 INFO L168 Benchmark]: RCFGBuilder took 584.69 ms. Allocated memory is still 202.9 MB. Free memory was 179.9 MB in the beginning and 161.0 MB in the end (delta: 18.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 7.1 GB. [2020-07-20 06:06:55,608 INFO L168 Benchmark]: TraceAbstraction took 4445.23 ms. Allocated memory was 202.9 MB in the beginning and 248.0 MB in the end (delta: 45.1 MB). Free memory was 160.3 MB in the beginning and 212.0 MB in the end (delta: -51.7 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 06:06:55,622 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 137.4 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 410.39 ms. Allocated memory is still 137.4 MB. Free memory was 101.7 MB in the beginning and 91.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 188.95 ms. Allocated memory was 137.4 MB in the beginning and 202.9 MB in the end (delta: 65.5 MB). Free memory was 91.0 MB in the beginning and 179.9 MB in the end (delta: -88.9 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 584.69 ms. Allocated memory is still 202.9 MB. Free memory was 179.9 MB in the beginning and 161.0 MB in the end (delta: 18.9 MB). Peak memory consumption was 18.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4445.23 ms. Allocated memory was 202.9 MB in the beginning and 248.0 MB in the end (delta: 45.1 MB). Free memory was 160.3 MB in the beginning and 212.0 MB in the end (delta: -51.7 MB). There was no memory consumed. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 9]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 58. Possible FailurePath: [L20] char string_A[5], string_B[5]; [L21] int i, j, nc_A, nc_B, found=0; [L24] i=0 VAL [found=0, i=0, string_A={7:0}, string_B={6:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=1, string_A={7:0}, string_B={6:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=2, string_A={7:0}, string_B={6:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=3, string_A={7:0}, string_B={6:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=4, string_A={7:0}, string_B={6:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=5, string_A={7:0}, string_B={6:0}] [L24] COND FALSE !(i<5) VAL [found=0, i=5, string_A={7:0}, string_B={6:0}] [L26] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={7:0}, string_A[5 -1]=0, string_B={6:0}] [L26] COND FALSE !(!(string_A[5 -1]=='\0')) [L28] i=0 VAL [found=0, i=0, string_A={7:0}, string_B={6:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=1, string_A={7:0}, string_B={6:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=2, string_A={7:0}, string_B={6:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=3, string_A={7:0}, string_B={6:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=4, string_A={7:0}, string_B={6:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=5, string_A={7:0}, string_B={6:0}] [L28] COND FALSE !(i<5) VAL [found=0, i=5, string_A={7:0}, string_B={6:0}] [L30] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={7:0}, string_B={6:0}, string_B[5 -1]=0] [L30] COND FALSE !(!(string_B[5 -1]=='\0')) [L32] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={7:0}, string_B={6:0}] [L33] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={7:0}, string_A[nc_A]=0, string_B={6:0}] [L33] COND FALSE !(string_A[nc_A]!='\0') [L36] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={7:0}, string_B={6:0}] [L37] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={7:0}, string_B={6:0}, string_B[nc_B]=0] [L37] COND FALSE !(string_B[nc_B]!='\0') [L40] COND FALSE !(!(nc_B >= nc_A)) [L43] EXPR j=0 [L43] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={7:0}, string_B={6:0}] [L44] COND FALSE !((inc_B-1)<