/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 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 13:43:03,694 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 13:43:03,698 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 13:43:03,725 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 13:43:03,726 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 13:43:03,727 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 13:43:03,729 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 13:43:03,731 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 13:43:03,733 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 13:43:03,734 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 13:43:03,735 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 13:43:03,736 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 13:43:03,736 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 13:43:03,738 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 13:43:03,739 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 13:43:03,740 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 13:43:03,741 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 13:43:03,742 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 13:43:03,744 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 13:43:03,746 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 13:43:03,750 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 13:43:03,751 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 13:43:03,755 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 13:43:03,756 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 13:43:03,761 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 13:43:03,773 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 13:43:03,775 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 13:43:03,777 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 13:43:03,777 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 [2020-09-04 13:43:03,841 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 13:43:03,841 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 13:43:03,843 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-04 13:43:03,844 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-04 13:43:03,844 INFO L138 SettingsManager]: * Use SBE=true [2020-09-04 13:43:03,844 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 13:43:03,844 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 13:43:03,845 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 13:43:03,845 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 13:43:03,845 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 13:43:03,845 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 13:43:03,845 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 13:43:03,845 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 13:43:03,846 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 13:43:03,847 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 13:43:03,847 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 13:43:03,847 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 13:43:03,847 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 13:43:03,847 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-04 13:43:03,848 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 13:43:03,848 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 13:43:03,848 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 13:43:03,848 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 13:43:03,849 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-04 13:43:03,849 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-04 13:43:03,849 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-04 13:43:03,849 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-04 13:43:03,849 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 13:43:03,850 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-04 13:43:03,850 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-09-04 13:43:04,341 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 13:43:04,358 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 13:43:04,365 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 13:43:04,366 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 13:43:04,367 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 13:43:04,368 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-09-04 13:43:04,461 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6d3a3ac18/f15ea8468d73453088071a8f2556d95e/FLAGa5405a35b [2020-09-04 13:43:05,013 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 13:43:05,014 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-09-04 13:43:05,021 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6d3a3ac18/f15ea8468d73453088071a8f2556d95e/FLAGa5405a35b [2020-09-04 13:43:05,353 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6d3a3ac18/f15ea8468d73453088071a8f2556d95e [2020-09-04 13:43:05,368 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 13:43:05,371 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 13:43:05,372 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 13:43:05,372 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 13:43:05,377 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 13:43:05,378 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:43:05" (1/1) ... [2020-09-04 13:43:05,382 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@260ceee4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:05, skipping insertion in model container [2020-09-04 13:43:05,383 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:43:05" (1/1) ... [2020-09-04 13:43:05,392 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 13:43:05,419 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 13:43:05,641 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:43:05,646 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 13:43:05,672 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:43:05,694 INFO L208 MainTranslator]: Completed translation [2020-09-04 13:43:05,694 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:05 WrapperNode [2020-09-04 13:43:05,695 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 13:43:05,696 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 13:43:05,696 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 13:43:05,696 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 13:43:05,801 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:05" (1/1) ... [2020-09-04 13:43:05,801 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:05" (1/1) ... [2020-09-04 13:43:05,812 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:05" (1/1) ... [2020-09-04 13:43:05,812 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:05" (1/1) ... [2020-09-04 13:43:05,820 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:05" (1/1) ... [2020-09-04 13:43:05,826 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:05" (1/1) ... [2020-09-04 13:43:05,828 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:05" (1/1) ... [2020-09-04 13:43:05,830 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 13:43:05,831 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 13:43:05,831 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 13:43:05,831 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 13:43:05,832 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:05" (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 [2020-09-04 13:43:05,914 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 13:43:05,914 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 13:43:05,915 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 13:43:05,915 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 13:43:05,916 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 13:43:05,916 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-04 13:43:05,916 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 13:43:05,917 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-04 13:43:05,917 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-09-04 13:43:05,917 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 13:43:05,917 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-04 13:43:05,918 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-04 13:43:05,918 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-04 13:43:05,919 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-04 13:43:05,919 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 13:43:05,921 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 13:43:06,262 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 13:43:06,262 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-09-04 13:43:06,272 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:43:06 BoogieIcfgContainer [2020-09-04 13:43:06,272 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 13:43:06,274 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 13:43:06,280 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 13:43:06,285 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 13:43:06,285 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 01:43:05" (1/3) ... [2020-09-04 13:43:06,286 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a11b09d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:43:06, skipping insertion in model container [2020-09-04 13:43:06,286 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:43:05" (2/3) ... [2020-09-04 13:43:06,286 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a11b09d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:43:06, skipping insertion in model container [2020-09-04 13:43:06,287 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:43:06" (3/3) ... [2020-09-04 13:43:06,289 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-09-04 13:43:06,299 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-09-04 13:43:06,307 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 13:43:06,330 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 13:43:06,355 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 13:43:06,355 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 13:43:06,355 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-09-04 13:43:06,356 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 13:43:06,356 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 13:43:06,356 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 13:43:06,356 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 13:43:06,356 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 13:43:06,379 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-09-04 13:43:06,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-04 13:43:06,386 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:06,387 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:06,387 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:06,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:06,394 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-09-04 13:43:06,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:06,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1504216528] [2020-09-04 13:43:06,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:06,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:06,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:06,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:06,627 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:06,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1504216528] [2020-09-04 13:43:06,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:43:06,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-04 13:43:06,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467415820] [2020-09-04 13:43:06,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-04 13:43:06,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:06,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-04 13:43:06,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 13:43:06,661 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-09-04 13:43:06,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:06,779 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-09-04 13:43:06,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-04 13:43:06,782 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-09-04 13:43:06,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:06,798 INFO L225 Difference]: With dead ends: 51 [2020-09-04 13:43:06,798 INFO L226 Difference]: Without dead ends: 24 [2020-09-04 13:43:06,803 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 [2020-09-04 13:43:06,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-09-04 13:43:06,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-09-04 13:43:06,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-09-04 13:43:06,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-09-04 13:43:06,867 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-09-04 13:43:06,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:06,867 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-09-04 13:43:06,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-04 13:43:06,868 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-09-04 13:43:06,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-09-04 13:43:06,869 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:06,870 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:06,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 13:43:06,871 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:06,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:06,872 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-09-04 13:43:06,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:06,873 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027141327] [2020-09-04 13:43:06,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:06,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:07,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:07,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:07,024 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:07,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027141327] [2020-09-04 13:43:07,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:43:07,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 13:43:07,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125131212] [2020-09-04 13:43:07,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 13:43:07,031 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:07,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 13:43:07,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-04 13:43:07,034 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-09-04 13:43:07,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:07,167 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-09-04 13:43:07,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 13:43:07,168 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-09-04 13:43:07,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:07,172 INFO L225 Difference]: With dead ends: 44 [2020-09-04 13:43:07,172 INFO L226 Difference]: Without dead ends: 30 [2020-09-04 13:43:07,174 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 [2020-09-04 13:43:07,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-04 13:43:07,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-09-04 13:43:07,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-09-04 13:43:07,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-09-04 13:43:07,188 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-09-04 13:43:07,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:07,188 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-09-04 13:43:07,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 13:43:07,189 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-09-04 13:43:07,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-04 13:43:07,190 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:07,190 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:43:07,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 13:43:07,190 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:07,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:07,191 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-09-04 13:43:07,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:07,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306708694] [2020-09-04 13:43:07,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:07,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:07,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:07,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:07,285 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-04 13:43:07,286 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306708694] [2020-09-04 13:43:07,286 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:43:07,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 13:43:07,287 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196233554] [2020-09-04 13:43:07,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 13:43:07,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:07,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 13:43:07,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 13:43:07,288 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-09-04 13:43:07,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:07,401 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-09-04 13:43:07,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 13:43:07,402 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-09-04 13:43:07,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:07,403 INFO L225 Difference]: With dead ends: 37 [2020-09-04 13:43:07,403 INFO L226 Difference]: Without dead ends: 26 [2020-09-04 13:43:07,404 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 [2020-09-04 13:43:07,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-09-04 13:43:07,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-09-04 13:43:07,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-09-04 13:43:07,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-09-04 13:43:07,412 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-09-04 13:43:07,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:07,413 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-09-04 13:43:07,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 13:43:07,413 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-09-04 13:43:07,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-09-04 13:43:07,414 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:07,415 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] [2020-09-04 13:43:07,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 13:43:07,415 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:07,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:07,416 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-09-04 13:43:07,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:07,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622889247] [2020-09-04 13:43:07,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:07,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:07,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:07,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:07,911 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:07,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622889247] [2020-09-04 13:43:07,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469645558] [2020-09-04 13:43:07,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:43:07,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:07,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 22 conjunts are in the unsatisfiable core [2020-09-04 13:43:07,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:08,111 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-09-04 13:43:08,114 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:08,125 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:08,126 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:08,127 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2020-09-04 13:43:08,299 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 15 [2020-09-04 13:43:08,300 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:08,315 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:08,315 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:08,316 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:22 [2020-09-04 13:43:08,437 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:08,437 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 20 [2020-09-04 13:43:08,439 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-09-04 13:43:08,456 INFO L625 ElimStorePlain]: treesize reduction 7, result has 66.7 percent of original size [2020-09-04 13:43:08,460 INFO L545 ElimStorePlain]: Start of recursive call 1: 5 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:08,461 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 6 variables, input treesize:38, output treesize:3 [2020-09-04 13:43:08,503 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:08,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:08,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 21 [2020-09-04 13:43:08,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55304002] [2020-09-04 13:43:08,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-04 13:43:08,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:08,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-04 13:43:08,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=358, Unknown=0, NotChecked=0, Total=420 [2020-09-04 13:43:08,507 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 21 states. [2020-09-04 13:43:09,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:09,177 INFO L93 Difference]: Finished difference Result 48 states and 53 transitions. [2020-09-04 13:43:09,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-09-04 13:43:09,177 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 21 [2020-09-04 13:43:09,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:09,178 INFO L225 Difference]: With dead ends: 48 [2020-09-04 13:43:09,179 INFO L226 Difference]: Without dead ends: 46 [2020-09-04 13:43:09,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 199 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=181, Invalid=811, Unknown=0, NotChecked=0, Total=992 [2020-09-04 13:43:09,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-09-04 13:43:09,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 39. [2020-09-04 13:43:09,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-09-04 13:43:09,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-09-04 13:43:09,194 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-09-04 13:43:09,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:09,194 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-09-04 13:43:09,194 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-04 13:43:09,194 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-09-04 13:43:09,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-09-04 13:43:09,198 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:09,198 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] [2020-09-04 13:43:09,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:09,400 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:09,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:09,400 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-09-04 13:43:09,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:09,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009975765] [2020-09-04 13:43:09,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:09,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:09,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:09,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:09,484 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:09,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009975765] [2020-09-04 13:43:09,485 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070832449] [2020-09-04 13:43:09,485 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:43:09,535 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-09-04 13:43:09,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:09,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 6 conjunts are in the unsatisfiable core [2020-09-04 13:43:09,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:09,553 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:09,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:09,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 7 [2020-09-04 13:43:09,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314509839] [2020-09-04 13:43:09,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-04 13:43:09,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:09,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-04 13:43:09,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-09-04 13:43:09,555 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-09-04 13:43:09,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:09,759 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-09-04 13:43:09,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-04 13:43:09,760 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-09-04 13:43:09,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:09,762 INFO L225 Difference]: With dead ends: 59 [2020-09-04 13:43:09,762 INFO L226 Difference]: Without dead ends: 48 [2020-09-04 13:43:09,763 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-09-04 13:43:09,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-09-04 13:43:09,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-09-04 13:43:09,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-04 13:43:09,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-09-04 13:43:09,780 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-09-04 13:43:09,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:09,780 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-09-04 13:43:09,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-04 13:43:09,780 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-09-04 13:43:09,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-09-04 13:43:09,786 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:09,786 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] [2020-09-04 13:43:09,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:09,988 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:09,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:09,989 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-09-04 13:43:09,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:09,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254118969] [2020-09-04 13:43:09,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:10,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:10,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:10,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:10,455 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:10,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254118969] [2020-09-04 13:43:10,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [822585524] [2020-09-04 13:43:10,456 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:43:10,506 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-09-04 13:43:10,506 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:10,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 27 conjunts are in the unsatisfiable core [2020-09-04 13:43:10,511 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:10,520 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-09-04 13:43:10,522 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:10,528 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:10,528 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:10,529 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2020-09-04 13:43:10,719 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2020-09-04 13:43:10,721 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:10,729 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:10,730 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:10,730 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:24 [2020-09-04 13:43:10,831 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:10,832 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 22 [2020-09-04 13:43:10,833 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-09-04 13:43:10,849 INFO L625 ElimStorePlain]: treesize reduction 9, result has 60.9 percent of original size [2020-09-04 13:43:10,851 INFO L545 ElimStorePlain]: Start of recursive call 1: 5 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:10,852 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 6 variables, input treesize:40, output treesize:3 [2020-09-04 13:43:10,909 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:10,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:10,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 26 [2020-09-04 13:43:10,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678449787] [2020-09-04 13:43:10,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-09-04 13:43:10,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:10,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-09-04 13:43:10,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=581, Unknown=0, NotChecked=0, Total=650 [2020-09-04 13:43:10,912 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 26 states. [2020-09-04 13:43:12,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:12,169 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-09-04 13:43:12,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-04 13:43:12,169 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 25 [2020-09-04 13:43:12,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:12,173 INFO L225 Difference]: With dead ends: 70 [2020-09-04 13:43:12,173 INFO L226 Difference]: Without dead ends: 68 [2020-09-04 13:43:12,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 285 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=270, Invalid=1452, Unknown=0, NotChecked=0, Total=1722 [2020-09-04 13:43:12,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-09-04 13:43:12,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-09-04 13:43:12,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-09-04 13:43:12,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-09-04 13:43:12,187 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-09-04 13:43:12,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:12,188 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-09-04 13:43:12,188 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-09-04 13:43:12,188 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-09-04 13:43:12,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-09-04 13:43:12,189 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:12,189 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] [2020-09-04 13:43:12,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:12,393 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:12,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:12,394 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-09-04 13:43:12,394 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:12,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377030562] [2020-09-04 13:43:12,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:12,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:12,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:12,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:12,488 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:12,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377030562] [2020-09-04 13:43:12,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1653279378] [2020-09-04 13:43:12,489 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:43:12,540 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-09-04 13:43:12,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:12,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 29 conjunts are in the unsatisfiable core [2020-09-04 13:43:12,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:12,550 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-09-04 13:43:12,551 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:12,556 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:12,556 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:12,557 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2020-09-04 13:43:12,645 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2020-09-04 13:43:12,646 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:12,656 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:12,657 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:12,657 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:29 [2020-09-04 13:43:12,828 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:12,829 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 22 [2020-09-04 13:43:12,830 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-09-04 13:43:12,845 INFO L625 ElimStorePlain]: treesize reduction 9, result has 60.9 percent of original size [2020-09-04 13:43:12,849 INFO L545 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:12,849 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:40, output treesize:3 [2020-09-04 13:43:12,897 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-04 13:43:12,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:12,898 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13] total 19 [2020-09-04 13:43:12,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548389893] [2020-09-04 13:43:12,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-04 13:43:12,899 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:12,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-04 13:43:12,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-09-04 13:43:12,900 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 19 states. [2020-09-04 13:43:14,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:14,371 INFO L93 Difference]: Finished difference Result 96 states and 108 transitions. [2020-09-04 13:43:14,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-09-04 13:43:14,372 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 27 [2020-09-04 13:43:14,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:14,373 INFO L225 Difference]: With dead ends: 96 [2020-09-04 13:43:14,374 INFO L226 Difference]: Without dead ends: 82 [2020-09-04 13:43:14,375 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=286, Invalid=1520, Unknown=0, NotChecked=0, Total=1806 [2020-09-04 13:43:14,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-09-04 13:43:14,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 64. [2020-09-04 13:43:14,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-09-04 13:43:14,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 71 transitions. [2020-09-04 13:43:14,387 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 71 transitions. Word has length 27 [2020-09-04 13:43:14,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:14,388 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 71 transitions. [2020-09-04 13:43:14,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-04 13:43:14,388 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 71 transitions. [2020-09-04 13:43:14,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-04 13:43:14,389 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:14,389 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] [2020-09-04 13:43:14,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:14,605 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:14,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:14,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-09-04 13:43:14,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:14,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [963593720] [2020-09-04 13:43:14,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:14,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:14,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:14,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:14,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-09-04 13:43:14,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:14,707 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-04 13:43:14,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [963593720] [2020-09-04 13:43:14,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [399831997] [2020-09-04 13:43:14,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:14,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:14,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 6 conjunts are in the unsatisfiable core [2020-09-04 13:43:14,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:14,803 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-04 13:43:14,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:14,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 11 [2020-09-04 13:43:14,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917773425] [2020-09-04 13:43:14,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-04 13:43:14,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:14,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-04 13:43:14,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2020-09-04 13:43:14,806 INFO L87 Difference]: Start difference. First operand 64 states and 71 transitions. Second operand 11 states. [2020-09-04 13:43:15,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:15,022 INFO L93 Difference]: Finished difference Result 99 states and 112 transitions. [2020-09-04 13:43:15,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-04 13:43:15,023 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-09-04 13:43:15,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:15,025 INFO L225 Difference]: With dead ends: 99 [2020-09-04 13:43:15,025 INFO L226 Difference]: Without dead ends: 68 [2020-09-04 13:43:15,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2020-09-04 13:43:15,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-09-04 13:43:15,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 60. [2020-09-04 13:43:15,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-09-04 13:43:15,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2020-09-04 13:43:15,039 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 29 [2020-09-04 13:43:15,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:15,039 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2020-09-04 13:43:15,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-04 13:43:15,040 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2020-09-04 13:43:15,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-04 13:43:15,041 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:15,041 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] [2020-09-04 13:43:15,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:15,243 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:15,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:15,243 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-09-04 13:43:15,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:15,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250181386] [2020-09-04 13:43:15,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:15,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:15,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:15,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:15,731 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:15,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250181386] [2020-09-04 13:43:15,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [546080062] [2020-09-04 13:43:15,731 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:15,789 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-09-04 13:43:15,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:15,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 34 conjunts are in the unsatisfiable core [2020-09-04 13:43:15,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:15,805 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-09-04 13:43:15,809 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:15,814 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:15,814 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:15,815 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:12, output treesize:8 [2020-09-04 13:43:15,848 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-09-04 13:43:15,848 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:15,854 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:15,855 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:15,856 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:21, output treesize:8 [2020-09-04 13:43:15,893 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-09-04 13:43:15,893 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:15,899 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:15,900 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:15,900 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:21, output treesize:8 [2020-09-04 13:43:15,938 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2020-09-04 13:43:15,939 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:15,949 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:15,956 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:15,956 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:11 [2020-09-04 13:43:16,069 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2020-09-04 13:43:16,070 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:16,080 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:16,080 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:16,081 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:24 [2020-09-04 13:43:16,139 INFO L350 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2020-09-04 13:43:16,140 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 42 [2020-09-04 13:43:16,141 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:16,173 INFO L625 ElimStorePlain]: treesize reduction 22, result has 64.5 percent of original size [2020-09-04 13:43:16,174 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:16,175 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:44, output treesize:40 [2020-09-04 13:43:16,261 INFO L350 Elim1Store]: treesize reduction 20, result has 48.7 percent of original size [2020-09-04 13:43:16,262 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 39 treesize of output 51 [2020-09-04 13:43:16,263 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:16,298 INFO L625 ElimStorePlain]: treesize reduction 17, result has 74.6 percent of original size [2020-09-04 13:43:16,299 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:16,300 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:52, output treesize:50 [2020-09-04 13:43:16,409 INFO L350 Elim1Store]: treesize reduction 56, result has 33.3 percent of original size [2020-09-04 13:43:16,410 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 54 treesize of output 63 [2020-09-04 13:43:16,412 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:16,452 INFO L625 ElimStorePlain]: treesize reduction 15, result has 80.0 percent of original size [2020-09-04 13:43:16,453 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:16,454 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:64, output treesize:60 [2020-09-04 13:43:16,675 INFO L350 Elim1Store]: treesize reduction 32, result has 58.4 percent of original size [2020-09-04 13:43:16,676 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 1 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 65 treesize of output 63 [2020-09-04 13:43:16,678 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-09-04 13:43:16,703 INFO L625 ElimStorePlain]: treesize reduction 41, result has 25.5 percent of original size [2020-09-04 13:43:16,706 INFO L545 ElimStorePlain]: Start of recursive call 1: 5 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-09-04 13:43:16,706 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 6 variables, input treesize:75, output treesize:3 [2020-09-04 13:43:16,770 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:16,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:16,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 30 [2020-09-04 13:43:16,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113290194] [2020-09-04 13:43:16,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-09-04 13:43:16,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:16,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-09-04 13:43:16,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=791, Unknown=0, NotChecked=0, Total=870 [2020-09-04 13:43:16,774 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 30 states. [2020-09-04 13:43:19,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:19,353 INFO L93 Difference]: Finished difference Result 110 states and 123 transitions. [2020-09-04 13:43:19,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-09-04 13:43:19,354 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 29 [2020-09-04 13:43:19,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:19,356 INFO L225 Difference]: With dead ends: 110 [2020-09-04 13:43:19,357 INFO L226 Difference]: Without dead ends: 108 [2020-09-04 13:43:19,359 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 649 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=396, Invalid=2796, Unknown=0, NotChecked=0, Total=3192 [2020-09-04 13:43:19,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-09-04 13:43:19,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 68. [2020-09-04 13:43:19,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-09-04 13:43:19,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2020-09-04 13:43:19,371 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 29 [2020-09-04 13:43:19,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:19,372 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2020-09-04 13:43:19,372 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-09-04 13:43:19,372 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2020-09-04 13:43:19,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-04 13:43:19,373 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:19,373 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] [2020-09-04 13:43:19,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:19,589 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:19,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:19,590 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-09-04 13:43:19,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:19,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959714350] [2020-09-04 13:43:19,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:19,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:19,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:43:19,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:43:19,694 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:19,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959714350] [2020-09-04 13:43:19,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170303740] [2020-09-04 13:43:19,698 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:43:19,779 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2020-09-04 13:43:19,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:43:19,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 10 conjunts are in the unsatisfiable core [2020-09-04 13:43:19,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:43:19,795 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:43:19,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:43:19,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 9 [2020-09-04 13:43:19,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714925159] [2020-09-04 13:43:19,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 13:43:19,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:43:19,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 13:43:19,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-09-04 13:43:19,797 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand 9 states. [2020-09-04 13:43:20,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:43:20,044 INFO L93 Difference]: Finished difference Result 104 states and 116 transitions. [2020-09-04 13:43:20,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-04 13:43:20,044 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-09-04 13:43:20,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:43:20,046 INFO L225 Difference]: With dead ends: 104 [2020-09-04 13:43:20,046 INFO L226 Difference]: Without dead ends: 93 [2020-09-04 13:43:20,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-09-04 13:43:20,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-09-04 13:43:20,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 70. [2020-09-04 13:43:20,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-09-04 13:43:20,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 76 transitions. [2020-09-04 13:43:20,059 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 76 transitions. Word has length 31 [2020-09-04 13:43:20,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:43:20,059 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 76 transitions. [2020-09-04 13:43:20,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 13:43:20,060 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 76 transitions. [2020-09-04 13:43:20,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-09-04 13:43:20,061 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:43:20,061 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] [2020-09-04 13:43:20,274 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2020-09-04 13:43:20,275 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:43:20,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:43:20,275 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-09-04 13:43:20,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:43:20,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25830352] [2020-09-04 13:43:20,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:43:20,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:43:20,303 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:43:20,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:43:20,333 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:43:20,358 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-09-04 13:43:20,359 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 13:43:20,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-04 13:43:20,408 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 01:43:20 BoogieIcfgContainer [2020-09-04 13:43:20,408 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 13:43:20,410 INFO L168 Benchmark]: Toolchain (without parser) took 15040.42 ms. Allocated memory was 147.8 MB in the beginning and 337.1 MB in the end (delta: 189.3 MB). Free memory was 104.5 MB in the beginning and 238.5 MB in the end (delta: -134.0 MB). Peak memory consumption was 55.3 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:20,413 INFO L168 Benchmark]: CDTParser took 1.46 ms. Allocated memory is still 147.8 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-04 13:43:20,413 INFO L168 Benchmark]: CACSL2BoogieTranslator took 323.24 ms. Allocated memory is still 147.8 MB. Free memory was 104.3 MB in the beginning and 93.9 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:20,414 INFO L168 Benchmark]: Boogie Preprocessor took 134.92 ms. Allocated memory was 147.8 MB in the beginning and 202.9 MB in the end (delta: 55.1 MB). Free memory was 93.9 MB in the beginning and 181.2 MB in the end (delta: -87.3 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:20,414 INFO L168 Benchmark]: RCFGBuilder took 441.19 ms. Allocated memory is still 202.9 MB. Free memory was 181.2 MB in the beginning and 164.2 MB in the end (delta: 16.9 MB). Peak memory consumption was 16.9 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:20,415 INFO L168 Benchmark]: TraceAbstraction took 14134.73 ms. Allocated memory was 202.9 MB in the beginning and 337.1 MB in the end (delta: 134.2 MB). Free memory was 163.6 MB in the beginning and 238.5 MB in the end (delta: -74.9 MB). Peak memory consumption was 59.3 MB. Max. memory is 7.1 GB. [2020-09-04 13:43:20,417 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.46 ms. Allocated memory is still 147.8 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 323.24 ms. Allocated memory is still 147.8 MB. Free memory was 104.3 MB in the beginning and 93.9 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 134.92 ms. Allocated memory was 147.8 MB in the beginning and 202.9 MB in the end (delta: 55.1 MB). Free memory was 93.9 MB in the beginning and 181.2 MB in the end (delta: -87.3 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 441.19 ms. Allocated memory is still 202.9 MB. Free memory was 181.2 MB in the beginning and 164.2 MB in the end (delta: 16.9 MB). Peak memory consumption was 16.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 14134.73 ms. Allocated memory was 202.9 MB in the beginning and 337.1 MB in the end (delta: 134.2 MB). Free memory was 163.6 MB in the beginning and 238.5 MB in the end (delta: -74.9 MB). Peak memory consumption was 59.3 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)) VAL [MAX=2] [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 VAL [cont=0, i=0, MAX=2, str1={3:0}, str2={4:0}] [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ VAL [cont=0, i=1, j=1, MAX=2, str1={3:0}, str2={4:0}] [L27] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={3:0}, str2={4:0}] [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ VAL [cont=0, i=0, j=2, MAX=2, str1={3:0}, str2={4:0}] [L27] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={3:0}, str2={4:0}] [L27] COND FALSE !(i >= 0) VAL [cont=0, i=-1, j=2, MAX=2, str1={3:0}, str2={4:0}] [L32] j = MAX-1 [L33] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={3:0}, str2={4:0}] [L33] COND TRUE i