/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.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 10:28:46,502 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 10:28:46,507 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 10:28:46,551 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 10:28:46,551 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 10:28:46,562 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 10:28:46,564 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 10:28:46,569 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 10:28:46,572 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 10:28:46,575 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 10:28:46,577 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 10:28:46,578 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 10:28:46,578 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 10:28:46,581 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 10:28:46,584 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 10:28:46,586 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 10:28:46,588 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 10:28:46,589 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 10:28:46,591 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 10:28:46,600 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 10:28:46,603 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 10:28:46,604 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 10:28:46,605 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 10:28:46,606 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 10:28:46,609 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-21 10:28:46,615 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-21 10:28:46,616 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-21 10:28:46,616 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-21 10:28:46,617 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-21 10:28:46,619 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-21 10:28:46,619 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-21 10:28:46,620 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-21 10:28:46,620 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-21 10:28:46,620 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 10:28:46,621 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 10:28:46,623 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 10:28:46,624 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-21 10:28:46,673 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 10:28:46,674 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 10:28:46,676 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 10:28:46,677 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 10:28:46,677 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 10:28:46,677 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 10:28:46,678 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 10:28:46,678 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 10:28:46,678 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 10:28:46,678 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 10:28:46,679 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 10:28:46,680 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 10:28:46,680 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 10:28:46,680 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 10:28:46,680 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 10:28:46,681 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 10:28:46,681 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 10:28:46,681 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 10:28:46,681 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 10:28:46,682 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 10:28:46,682 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 10:28:46,682 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 10:28:46,682 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 10:28:46,682 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 10:28:46,683 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 10:28:46,683 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 10:28:46,683 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 10:28:46,683 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 10:28:46,683 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 10:28:46,684 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false [2020-09-21 10:28:47,192 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 10:28:47,211 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 10:28:47,215 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 10:28:47,217 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 10:28:47,219 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 10:28:47,220 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-09-21 10:28:47,306 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/171f1b050/d88c3aff9df14921a02c4f3ff855b98f/FLAG9d7b2e294 [2020-09-21 10:28:47,878 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 10:28:47,879 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-09-21 10:28:47,886 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/171f1b050/d88c3aff9df14921a02c4f3ff855b98f/FLAG9d7b2e294 [2020-09-21 10:28:48,217 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/171f1b050/d88c3aff9df14921a02c4f3ff855b98f [2020-09-21 10:28:48,233 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 10:28:48,240 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 10:28:48,246 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 10:28:48,246 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 10:28:48,251 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 10:28:48,252 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,257 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@713e8a30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48, skipping insertion in model container [2020-09-21 10:28:48,257 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,267 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 10:28:48,296 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 10:28:48,626 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:28:48,632 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 10:28:48,677 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 10:28:48,706 INFO L208 MainTranslator]: Completed translation [2020-09-21 10:28:48,708 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48 WrapperNode [2020-09-21 10:28:48,708 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 10:28:48,709 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 10:28:48,709 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 10:28:48,709 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 10:28:48,808 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,810 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,824 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,825 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,834 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,841 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,842 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... [2020-09-21 10:28:48,845 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 10:28:48,845 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 10:28:48,846 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 10:28:48,846 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 10:28:48,847 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-21 10:28:48,934 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 10:28:48,935 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 10:28:48,935 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-21 10:28:48,935 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 10:28:48,935 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 10:28:48,936 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-21 10:28:48,936 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-21 10:28:48,936 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-21 10:28:48,937 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-09-21 10:28:48,937 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 10:28:48,937 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-21 10:28:48,938 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-21 10:28:48,939 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-21 10:28:48,939 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-21 10:28:48,939 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 10:28:48,940 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 10:28:49,306 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 10:28:49,306 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-09-21 10:28:49,310 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:28:49 BoogieIcfgContainer [2020-09-21 10:28:49,311 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 10:28:49,312 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 10:28:49,313 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 10:28:49,316 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 10:28:49,316 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 10:28:48" (1/3) ... [2020-09-21 10:28:49,317 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4204fbe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:28:49, skipping insertion in model container [2020-09-21 10:28:49,318 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 10:28:48" (2/3) ... [2020-09-21 10:28:49,318 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4204fbe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 10:28:49, skipping insertion in model container [2020-09-21 10:28:49,318 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 10:28:49" (3/3) ... [2020-09-21 10:28:49,320 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-09-21 10:28:49,330 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 10:28:49,340 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 10:28:49,363 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 10:28:49,388 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 10:28:49,388 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 10:28:49,388 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 10:28:49,388 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 10:28:49,388 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 10:28:49,389 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 10:28:49,389 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 10:28:49,389 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 10:28:49,411 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-09-21 10:28:49,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-21 10:28:49,418 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:49,419 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:49,419 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:49,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:49,427 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-09-21 10:28:49,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:49,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [608303730] [2020-09-21 10:28:49,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:49,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:49,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,668 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:49,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [608303730] [2020-09-21 10:28:49,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:49,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-21 10:28:49,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617671250] [2020-09-21 10:28:49,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-21 10:28:49,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:49,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-21 10:28:49,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:28:49,703 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-09-21 10:28:49,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:49,815 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-09-21 10:28:49,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-21 10:28:49,817 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-09-21 10:28:49,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:49,828 INFO L225 Difference]: With dead ends: 51 [2020-09-21 10:28:49,829 INFO L226 Difference]: Without dead ends: 24 [2020-09-21 10:28:49,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-21 10:28:49,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-09-21 10:28:49,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-09-21 10:28:49,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-09-21 10:28:49,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-09-21 10:28:49,875 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-09-21 10:28:49,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:49,875 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-09-21 10:28:49,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-21 10:28:49,876 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-09-21 10:28:49,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-21 10:28:49,877 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:49,877 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:49,877 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 10:28:49,877 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:49,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:49,878 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-09-21 10:28:49,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:49,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [756834862] [2020-09-21 10:28:49,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:49,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:49,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:49,994 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:49,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [756834862] [2020-09-21 10:28:49,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:49,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 10:28:49,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347255931] [2020-09-21 10:28:49,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:28:49,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:49,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:28:49,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:28:49,999 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-09-21 10:28:50,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:50,116 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-09-21 10:28:50,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:28:50,117 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-09-21 10:28:50,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:50,121 INFO L225 Difference]: With dead ends: 44 [2020-09-21 10:28:50,121 INFO L226 Difference]: Without dead ends: 30 [2020-09-21 10:28:50,122 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-09-21 10:28:50,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-21 10:28:50,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-09-21 10:28:50,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-09-21 10:28:50,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-09-21 10:28:50,136 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-09-21 10:28:50,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:50,137 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-09-21 10:28:50,137 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:28:50,137 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-09-21 10:28:50,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-21 10:28:50,138 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:50,138 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:50,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 10:28:50,139 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:50,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:50,139 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-09-21 10:28:50,139 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:50,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1589844121] [2020-09-21 10:28:50,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:50,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:50,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:50,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:50,309 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-21 10:28:50,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1589844121] [2020-09-21 10:28:50,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 10:28:50,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 10:28:50,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765072242] [2020-09-21 10:28:50,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 10:28:50,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:50,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 10:28:50,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-21 10:28:50,315 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-09-21 10:28:50,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:50,458 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-09-21 10:28:50,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-21 10:28:50,459 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-09-21 10:28:50,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:50,461 INFO L225 Difference]: With dead ends: 37 [2020-09-21 10:28:50,461 INFO L226 Difference]: Without dead ends: 26 [2020-09-21 10:28:50,462 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:28:50,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-09-21 10:28:50,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-09-21 10:28:50,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-09-21 10:28:50,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-09-21 10:28:50,474 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-09-21 10:28:50,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:50,475 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-09-21 10:28:50,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 10:28:50,475 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-09-21 10:28:50,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-09-21 10:28:50,476 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:50,477 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] [2020-09-21 10:28:50,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 10:28:50,477 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:50,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:50,478 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-09-21 10:28:50,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:50,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698198586] [2020-09-21 10:28:50,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:50,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:50,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:50,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:50,959 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:50,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698198586] [2020-09-21 10:28:50,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:50,960 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-21 10:28:50,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993375571] [2020-09-21 10:28:50,961 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-21 10:28:50,961 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:50,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-21 10:28:50,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-09-21 10:28:50,963 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 13 states. [2020-09-21 10:28:51,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:51,490 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-09-21 10:28:51,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-09-21 10:28:51,491 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-09-21 10:28:51,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:51,493 INFO L225 Difference]: With dead ends: 50 [2020-09-21 10:28:51,493 INFO L226 Difference]: Without dead ends: 48 [2020-09-21 10:28:51,494 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2020-09-21 10:28:51,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-09-21 10:28:51,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2020-09-21 10:28:51,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-09-21 10:28:51,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-09-21 10:28:51,511 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-09-21 10:28:51,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:51,513 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-09-21 10:28:51,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-21 10:28:51,513 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-09-21 10:28:51,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-09-21 10:28:51,514 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:51,515 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:51,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 10:28:51,515 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:51,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:51,516 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-09-21 10:28:51,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:51,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894506089] [2020-09-21 10:28:51,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:51,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:51,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:51,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:51,692 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:51,692 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [894506089] [2020-09-21 10:28:51,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:51,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 10:28:51,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314993186] [2020-09-21 10:28:51,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 10:28:51,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:51,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 10:28:51,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-09-21 10:28:51,696 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-09-21 10:28:51,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:51,897 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-09-21 10:28:51,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-21 10:28:51,898 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-09-21 10:28:51,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:51,899 INFO L225 Difference]: With dead ends: 59 [2020-09-21 10:28:51,899 INFO L226 Difference]: Without dead ends: 48 [2020-09-21 10:28:51,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:28:51,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-09-21 10:28:51,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-09-21 10:28:51,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-21 10:28:51,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-09-21 10:28:51,909 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-09-21 10:28:51,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:51,910 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-09-21 10:28:51,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 10:28:51,910 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-09-21 10:28:51,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-09-21 10:28:51,911 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:51,911 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] [2020-09-21 10:28:51,912 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-21 10:28:51,912 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:51,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:51,912 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-09-21 10:28:51,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:51,913 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1889558863] [2020-09-21 10:28:51,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:51,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:52,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:52,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:52,322 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:52,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1889558863] [2020-09-21 10:28:52,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:52,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-21 10:28:52,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767729445] [2020-09-21 10:28:52,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-21 10:28:52,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:52,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-21 10:28:52,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2020-09-21 10:28:52,325 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 15 states. [2020-09-21 10:28:53,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:53,277 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-09-21 10:28:53,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-21 10:28:53,277 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2020-09-21 10:28:53,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:53,280 INFO L225 Difference]: With dead ends: 70 [2020-09-21 10:28:53,281 INFO L226 Difference]: Without dead ends: 68 [2020-09-21 10:28:53,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2020-09-21 10:28:53,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-09-21 10:28:53,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-09-21 10:28:53,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-09-21 10:28:53,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-09-21 10:28:53,301 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-09-21 10:28:53,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:53,302 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-09-21 10:28:53,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-21 10:28:53,303 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-09-21 10:28:53,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-09-21 10:28:53,304 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:53,304 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:53,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-21 10:28:53,304 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:53,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:53,305 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-09-21 10:28:53,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:53,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998749427] [2020-09-21 10:28:53,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:53,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:53,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:53,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:53,415 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:53,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998749427] [2020-09-21 10:28:53,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:53,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:28:53,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664239880] [2020-09-21 10:28:53,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:28:53,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:53,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:28:53,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:28:53,418 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-09-21 10:28:53,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:53,673 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-09-21 10:28:53,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-21 10:28:53,673 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-09-21 10:28:53,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:53,674 INFO L225 Difference]: With dead ends: 74 [2020-09-21 10:28:53,675 INFO L226 Difference]: Without dead ends: 63 [2020-09-21 10:28:53,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-09-21 10:28:53,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-09-21 10:28:53,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-09-21 10:28:53,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-09-21 10:28:53,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-09-21 10:28:53,684 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-09-21 10:28:53,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:53,685 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-09-21 10:28:53,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:28:53,685 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-09-21 10:28:53,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-21 10:28:53,686 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:53,686 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-09-21 10:28:53,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-21 10:28:53,687 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:53,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:53,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-09-21 10:28:53,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:53,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1055055514] [2020-09-21 10:28:53,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:53,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:53,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:53,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:53,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-09-21 10:28:53,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:53,797 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-21 10:28:53,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1055055514] [2020-09-21 10:28:53,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:53,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-21 10:28:53,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176256394] [2020-09-21 10:28:53,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-21 10:28:53,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:53,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-21 10:28:53,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-21 10:28:53,800 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-09-21 10:28:53,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:53,971 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-09-21 10:28:53,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-21 10:28:53,972 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-09-21 10:28:53,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:53,973 INFO L225 Difference]: With dead ends: 75 [2020-09-21 10:28:53,973 INFO L226 Difference]: Without dead ends: 55 [2020-09-21 10:28:53,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-09-21 10:28:53,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-09-21 10:28:53,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-09-21 10:28:53,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-09-21 10:28:53,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-09-21 10:28:53,982 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2020-09-21 10:28:53,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:53,983 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-09-21 10:28:53,983 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-21 10:28:53,983 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-09-21 10:28:53,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-21 10:28:53,984 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:53,984 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] [2020-09-21 10:28:53,985 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-21 10:28:53,985 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:53,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:53,985 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-09-21 10:28:53,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:53,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702854692] [2020-09-21 10:28:53,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:54,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:54,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:54,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:54,443 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:54,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702854692] [2020-09-21 10:28:54,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:54,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-21 10:28:54,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [659482260] [2020-09-21 10:28:54,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-21 10:28:54,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:54,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-21 10:28:54,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2020-09-21 10:28:54,446 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 17 states. [2020-09-21 10:28:56,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:56,302 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2020-09-21 10:28:56,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-09-21 10:28:56,303 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2020-09-21 10:28:56,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:56,304 INFO L225 Difference]: With dead ends: 97 [2020-09-21 10:28:56,304 INFO L226 Difference]: Without dead ends: 95 [2020-09-21 10:28:56,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=250, Invalid=1556, Unknown=0, NotChecked=0, Total=1806 [2020-09-21 10:28:56,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-09-21 10:28:56,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 52. [2020-09-21 10:28:56,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-09-21 10:28:56,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-09-21 10:28:56,316 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2020-09-21 10:28:56,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:56,317 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-09-21 10:28:56,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-21 10:28:56,317 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-09-21 10:28:56,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-21 10:28:56,318 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:56,318 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:56,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-21 10:28:56,319 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:56,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:56,319 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-09-21 10:28:56,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:56,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692015130] [2020-09-21 10:28:56,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:56,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:56,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 10:28:56,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 10:28:56,437 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 10:28:56,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692015130] [2020-09-21 10:28:56,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 10:28:56,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-21 10:28:56,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652113857] [2020-09-21 10:28:56,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-21 10:28:56,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 10:28:56,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-21 10:28:56,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-09-21 10:28:56,442 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-09-21 10:28:56,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 10:28:56,798 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-09-21 10:28:56,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-21 10:28:56,799 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-09-21 10:28:56,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 10:28:56,800 INFO L225 Difference]: With dead ends: 88 [2020-09-21 10:28:56,800 INFO L226 Difference]: Without dead ends: 77 [2020-09-21 10:28:56,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-09-21 10:28:56,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-09-21 10:28:56,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-09-21 10:28:56,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-09-21 10:28:56,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-09-21 10:28:56,811 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-09-21 10:28:56,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 10:28:56,812 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-09-21 10:28:56,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-21 10:28:56,812 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-09-21 10:28:56,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-21 10:28:56,813 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 10:28:56,813 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 10:28:56,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-21 10:28:56,814 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 10:28:56,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 10:28:56,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-09-21 10:28:56,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 10:28:56,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450336302] [2020-09-21 10:28:56,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 10:28:56,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-21 10:28:56,843 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-21 10:28:56,844 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-21 10:28:56,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-21 10:28:56,870 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.09 10:28:56 BoogieIcfgContainer [2020-09-21 10:28:56,871 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-21 10:28:56,874 INFO L168 Benchmark]: Toolchain (without parser) took 8637.65 ms. Allocated memory was 138.9 MB in the beginning and 305.7 MB in the end (delta: 166.7 MB). Free memory was 100.8 MB in the beginning and 247.4 MB in the end (delta: -146.6 MB). Peak memory consumption was 20.1 MB. Max. memory is 7.1 GB. [2020-09-21 10:28:56,875 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 138.9 MB. Free memory was 119.2 MB in the beginning and 118.8 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. [2020-09-21 10:28:56,876 INFO L168 Benchmark]: CACSL2BoogieTranslator took 462.39 ms. Allocated memory is still 138.9 MB. Free memory was 100.0 MB in the beginning and 89.8 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-09-21 10:28:56,877 INFO L168 Benchmark]: Boogie Preprocessor took 136.19 ms. Allocated memory was 138.9 MB in the beginning and 200.3 MB in the end (delta: 61.3 MB). Free memory was 89.8 MB in the beginning and 177.7 MB in the end (delta: -87.9 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-09-21 10:28:56,878 INFO L168 Benchmark]: RCFGBuilder took 465.73 ms. Allocated memory is still 200.3 MB. Free memory was 177.7 MB in the beginning and 160.6 MB in the end (delta: 17.1 MB). Peak memory consumption was 17.1 MB. Max. memory is 7.1 GB. [2020-09-21 10:28:56,878 INFO L168 Benchmark]: TraceAbstraction took 7558.49 ms. Allocated memory was 200.3 MB in the beginning and 305.7 MB in the end (delta: 105.4 MB). Free memory was 160.6 MB in the beginning and 247.4 MB in the end (delta: -86.8 MB). Peak memory consumption was 18.6 MB. Max. memory is 7.1 GB. [2020-09-21 10:28:56,882 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 138.9 MB. Free memory was 119.2 MB in the beginning and 118.8 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 462.39 ms. Allocated memory is still 138.9 MB. Free memory was 100.0 MB in the beginning and 89.8 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 136.19 ms. Allocated memory was 138.9 MB in the beginning and 200.3 MB in the end (delta: 61.3 MB). Free memory was 89.8 MB in the beginning and 177.7 MB in the end (delta: -87.9 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 465.73 ms. Allocated memory is still 200.3 MB. Free memory was 177.7 MB in the beginning and 160.6 MB in the end (delta: 17.1 MB). Peak memory consumption was 17.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7558.49 ms. Allocated memory was 200.3 MB in the beginning and 305.7 MB in the end (delta: 105.4 MB). Free memory was 160.6 MB in the beginning and 247.4 MB in the end (delta: -86.8 MB). Peak memory consumption was 18.6 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: [L14] int MAX = __VERIFIER_nondet_uint(); [L15] COND FALSE !(!(MAX > 0)) [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i