/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/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 17:44:41,543 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 17:44:41,547 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 17:44:41,574 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-09-04 17:44:41,585 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 17:44:41,586 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 17:44:41,588 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 17:44:41,589 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 17:44:41,590 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 17:44:41,591 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 17:44:41,593 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 17:44:41,595 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 17:44:41,597 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 17:44:41,599 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 17:44:41,603 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 17:44:41,604 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 17:44:41,611 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 17:44:41,632 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 17:44:41,636 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 17:44:41,637 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 17:44:41,638 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 17:44:41,656 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 17:44:41,657 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 17:44:41,659 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 17:44:41,660 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 17:44:41,660 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 17:44:41,660 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 17:44:41,660 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 17:44:41,660 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 17:44:41,661 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 17:44:41,661 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 17:44:41,662 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 17:44:41,662 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 17:44:41,662 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 17:44:41,663 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 17:44:41,663 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 17:44:41,663 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 17:44:41,664 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 17:44:41,664 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 17:44:41,664 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 17:44:41,664 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 17:44:41,664 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 17:44:41,667 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 17:44:41,667 INFO L138 SettingsManager]: * Use separate solver for trace checks=false [2020-09-04 17:44:42,135 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 17:44:42,161 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 17:44:42,165 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 17:44:42,168 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 17:44:42,169 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 17:44:42,170 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-09-04 17:44:42,256 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4a7c4a6d3/ca32b5473c6c4868bfebebbb2974891f/FLAG2116bccc3 [2020-09-04 17:44:42,790 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 17:44:42,791 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-09-04 17:44:42,799 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4a7c4a6d3/ca32b5473c6c4868bfebebbb2974891f/FLAG2116bccc3 [2020-09-04 17:44:43,138 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4a7c4a6d3/ca32b5473c6c4868bfebebbb2974891f [2020-09-04 17:44:43,152 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 17:44:43,155 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 17:44:43,157 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 17:44:43,158 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 17:44:43,162 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 17:44:43,163 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 05:44:43" (1/1) ... [2020-09-04 17:44:43,168 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@9be6589 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:44:43, skipping insertion in model container [2020-09-04 17:44:43,169 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 05:44:43" (1/1) ... [2020-09-04 17:44:43,179 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 17:44:43,208 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 17:44:43,518 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 17:44:43,525 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 17:44:43,575 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 17:44:43,608 INFO L208 MainTranslator]: Completed translation [2020-09-04 17:44:43,609 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:44:43 WrapperNode [2020-09-04 17:44:43,609 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 17:44:43,610 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 17:44:43,611 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 17:44:43,611 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 17:44:43,729 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:44:43" (1/1) ... [2020-09-04 17:44:43,729 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:44:43" (1/1) ... [2020-09-04 17:44:43,743 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:44:43" (1/1) ... [2020-09-04 17:44:43,744 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:44:43" (1/1) ... [2020-09-04 17:44:43,767 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:44:43" (1/1) ... [2020-09-04 17:44:43,774 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:44:43" (1/1) ... [2020-09-04 17:44:43,780 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:44:43" (1/1) ... [2020-09-04 17:44:43,784 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 17:44:43,784 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 17:44:43,784 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 17:44:43,784 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 17:44:43,786 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:44:43" (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 17:44:43,865 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 17:44:43,865 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 17:44:43,865 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 17:44:43,866 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 17:44:43,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 17:44:43,866 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-04 17:44:43,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 17:44:43,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-04 17:44:43,867 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-09-04 17:44:43,867 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 17:44:43,867 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-04 17:44:43,867 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-04 17:44:43,867 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-04 17:44:43,868 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-04 17:44:43,868 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 17:44:43,868 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 17:44:44,258 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 17:44:44,258 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-09-04 17:44:44,264 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 05:44:44 BoogieIcfgContainer [2020-09-04 17:44:44,265 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 17:44:44,266 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 17:44:44,267 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 17:44:44,270 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 17:44:44,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 05:44:43" (1/3) ... [2020-09-04 17:44:44,272 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@de894d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 05:44:44, skipping insertion in model container [2020-09-04 17:44:44,272 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 05:44:43" (2/3) ... [2020-09-04 17:44:44,272 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@de894d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 05:44:44, skipping insertion in model container [2020-09-04 17:44:44,273 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 05:44:44" (3/3) ... [2020-09-04 17:44:44,275 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-09-04 17:44:44,287 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 17:44:44,297 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 17:44:44,319 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 17:44:44,349 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 17:44:44,349 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 17:44:44,349 INFO L377 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-09-04 17:44:44,351 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 17:44:44,351 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 17:44:44,351 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 17:44:44,352 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 17:44:44,352 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 17:44:44,383 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states. [2020-09-04 17:44:44,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-04 17:44:44,402 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:44:44,404 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:44:44,405 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:44:44,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:44:44,414 INFO L82 PathProgramCache]: Analyzing trace with hash -1584943199, now seen corresponding path program 1 times [2020-09-04 17:44:44,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:44:44,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1465893458] [2020-09-04 17:44:44,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:44:44,514 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:44:44,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:44,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:44:44,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:44,699 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 17:44:44,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1465893458] [2020-09-04 17:44:44,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:44:44,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-04 17:44:44,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118142879] [2020-09-04 17:44:44,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-04 17:44:44,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:44:44,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-04 17:44:44,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-04 17:44:44,734 INFO L87 Difference]: Start difference. First operand 66 states. Second operand 3 states. [2020-09-04 17:44:44,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:44:44,954 INFO L93 Difference]: Finished difference Result 121 states and 135 transitions. [2020-09-04 17:44:44,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-04 17:44:44,956 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-09-04 17:44:44,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:44:44,969 INFO L225 Difference]: With dead ends: 121 [2020-09-04 17:44:44,969 INFO L226 Difference]: Without dead ends: 57 [2020-09-04 17:44:44,974 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 17:44:44,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-09-04 17:44:45,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-09-04 17:44:45,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-09-04 17:44:45,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2020-09-04 17:44:45,036 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 31 [2020-09-04 17:44:45,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:44:45,037 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2020-09-04 17:44:45,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-04 17:44:45,038 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2020-09-04 17:44:45,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-04 17:44:45,039 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:44:45,039 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:44:45,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 17:44:45,040 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:44:45,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:44:45,041 INFO L82 PathProgramCache]: Analyzing trace with hash -318765620, now seen corresponding path program 1 times [2020-09-04 17:44:45,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:44:45,042 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [80479405] [2020-09-04 17:44:45,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:44:45,045 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:44:45,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:45,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:44:45,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:45,181 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 17:44:45,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [80479405] [2020-09-04 17:44:45,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:44:45,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 17:44:45,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840685750] [2020-09-04 17:44:45,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 17:44:45,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:44:45,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 17:44:45,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-04 17:44:45,185 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand 5 states. [2020-09-04 17:44:45,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:44:45,386 INFO L93 Difference]: Finished difference Result 107 states and 112 transitions. [2020-09-04 17:44:45,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 17:44:45,387 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2020-09-04 17:44:45,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:44:45,391 INFO L225 Difference]: With dead ends: 107 [2020-09-04 17:44:45,391 INFO L226 Difference]: Without dead ends: 74 [2020-09-04 17:44:45,393 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 17:44:45,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-09-04 17:44:45,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 58. [2020-09-04 17:44:45,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-09-04 17:44:45,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-09-04 17:44:45,415 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 31 [2020-09-04 17:44:45,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:44:45,416 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-09-04 17:44:45,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 17:44:45,416 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-09-04 17:44:45,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-09-04 17:44:45,418 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:44:45,418 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:44:45,418 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 17:44:45,418 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:44:45,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:44:45,419 INFO L82 PathProgramCache]: Analyzing trace with hash -1837873718, now seen corresponding path program 1 times [2020-09-04 17:44:45,419 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:44:45,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [556124291] [2020-09-04 17:44:45,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:44:45,456 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:44:45,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:45,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:44:45,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:45,569 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 17:44:45,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [556124291] [2020-09-04 17:44:45,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:44:45,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 17:44:45,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432301254] [2020-09-04 17:44:45,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 17:44:45,572 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:44:45,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 17:44:45,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 17:44:45,572 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 5 states. [2020-09-04 17:44:45,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:44:45,745 INFO L93 Difference]: Finished difference Result 95 states and 99 transitions. [2020-09-04 17:44:45,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 17:44:45,746 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-09-04 17:44:45,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:44:45,748 INFO L225 Difference]: With dead ends: 95 [2020-09-04 17:44:45,748 INFO L226 Difference]: Without dead ends: 75 [2020-09-04 17:44:45,749 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 17:44:45,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-09-04 17:44:45,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 59. [2020-09-04 17:44:45,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-09-04 17:44:45,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2020-09-04 17:44:45,762 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 38 [2020-09-04 17:44:45,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:44:45,762 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2020-09-04 17:44:45,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 17:44:45,763 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2020-09-04 17:44:45,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-04 17:44:45,764 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:44:45,764 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:44:45,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 17:44:45,765 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:44:45,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:44:45,765 INFO L82 PathProgramCache]: Analyzing trace with hash -2141827952, now seen corresponding path program 1 times [2020-09-04 17:44:45,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:44:45,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1736473355] [2020-09-04 17:44:45,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:44:45,774 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:44:45,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:46,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:44:46,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:46,998 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 17:44:46,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1736473355] [2020-09-04 17:44:46,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:44:46,999 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2020-09-04 17:44:46,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578518481] [2020-09-04 17:44:47,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-04 17:44:47,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:44:47,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-04 17:44:47,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2020-09-04 17:44:47,001 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 19 states. [2020-09-04 17:44:48,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:44:48,840 INFO L93 Difference]: Finished difference Result 164 states and 173 transitions. [2020-09-04 17:44:48,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-09-04 17:44:48,841 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2020-09-04 17:44:48,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:44:48,844 INFO L225 Difference]: With dead ends: 164 [2020-09-04 17:44:48,844 INFO L226 Difference]: Without dead ends: 162 [2020-09-04 17:44:48,845 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=353, Invalid=1369, Unknown=0, NotChecked=0, Total=1722 [2020-09-04 17:44:48,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-09-04 17:44:48,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 90. [2020-09-04 17:44:48,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-09-04 17:44:48,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2020-09-04 17:44:48,871 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 48 [2020-09-04 17:44:48,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:44:48,871 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2020-09-04 17:44:48,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-04 17:44:48,872 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2020-09-04 17:44:48,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-09-04 17:44:48,874 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:44:48,874 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, 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 17:44:48,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 17:44:48,874 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:44:48,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:44:48,875 INFO L82 PathProgramCache]: Analyzing trace with hash -523876270, now seen corresponding path program 2 times [2020-09-04 17:44:48,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:44:48,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1072599920] [2020-09-04 17:44:48,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:44:48,882 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:44:48,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:48,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:44:48,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:48,997 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 17:44:48,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1072599920] [2020-09-04 17:44:48,998 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:44:48,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-09-04 17:44:48,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [664101407] [2020-09-04 17:44:48,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 17:44:49,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:44:49,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 17:44:49,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-09-04 17:44:49,001 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand 9 states. [2020-09-04 17:44:49,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:44:49,397 INFO L93 Difference]: Finished difference Result 171 states and 180 transitions. [2020-09-04 17:44:49,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-04 17:44:49,397 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 55 [2020-09-04 17:44:49,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:44:49,404 INFO L225 Difference]: With dead ends: 171 [2020-09-04 17:44:49,404 INFO L226 Difference]: Without dead ends: 151 [2020-09-04 17:44:49,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2020-09-04 17:44:49,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-09-04 17:44:49,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 100. [2020-09-04 17:44:49,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-09-04 17:44:49,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2020-09-04 17:44:49,450 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 55 [2020-09-04 17:44:49,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:44:49,453 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2020-09-04 17:44:49,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 17:44:49,453 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2020-09-04 17:44:49,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-09-04 17:44:49,457 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:44:49,458 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:44:49,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 17:44:49,458 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:44:49,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:44:49,459 INFO L82 PathProgramCache]: Analyzing trace with hash -2134174762, now seen corresponding path program 3 times [2020-09-04 17:44:49,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:44:49,459 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [27255169] [2020-09-04 17:44:49,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:44:49,468 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:44:49,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:49,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:44:49,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:49,651 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 17:44:49,651 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [27255169] [2020-09-04 17:44:49,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:44:49,653 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-09-04 17:44:49,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238436356] [2020-09-04 17:44:49,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 17:44:49,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:44:49,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 17:44:49,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-09-04 17:44:49,657 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand 10 states. [2020-09-04 17:44:49,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:44:49,989 INFO L93 Difference]: Finished difference Result 165 states and 172 transitions. [2020-09-04 17:44:49,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-04 17:44:49,990 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 58 [2020-09-04 17:44:49,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:44:49,991 INFO L225 Difference]: With dead ends: 165 [2020-09-04 17:44:49,992 INFO L226 Difference]: Without dead ends: 135 [2020-09-04 17:44:49,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=79, Invalid=227, Unknown=0, NotChecked=0, Total=306 [2020-09-04 17:44:49,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-09-04 17:44:50,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 100. [2020-09-04 17:44:50,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-09-04 17:44:50,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 103 transitions. [2020-09-04 17:44:50,034 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 103 transitions. Word has length 58 [2020-09-04 17:44:50,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:44:50,034 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 103 transitions. [2020-09-04 17:44:50,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 17:44:50,034 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 103 transitions. [2020-09-04 17:44:50,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-09-04 17:44:50,036 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:44:50,036 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:44:50,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 17:44:50,036 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:44:50,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:44:50,037 INFO L82 PathProgramCache]: Analyzing trace with hash -280271430, now seen corresponding path program 1 times [2020-09-04 17:44:50,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:44:50,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1690372967] [2020-09-04 17:44:50,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:44:50,043 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:44:50,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:50,149 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:44:50,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:50,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2020-09-04 17:44:50,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:50,161 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 17:44:50,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1690372967] [2020-09-04 17:44:50,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:44:50,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-09-04 17:44:50,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468638355] [2020-09-04 17:44:50,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 17:44:50,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:44:50,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 17:44:50,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-09-04 17:44:50,164 INFO L87 Difference]: Start difference. First operand 100 states and 103 transitions. Second operand 10 states. [2020-09-04 17:44:50,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:44:50,445 INFO L93 Difference]: Finished difference Result 143 states and 147 transitions. [2020-09-04 17:44:50,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-04 17:44:50,446 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 64 [2020-09-04 17:44:50,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:44:50,447 INFO L225 Difference]: With dead ends: 143 [2020-09-04 17:44:50,447 INFO L226 Difference]: Without dead ends: 92 [2020-09-04 17:44:50,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2020-09-04 17:44:50,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-09-04 17:44:50,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 76. [2020-09-04 17:44:50,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-09-04 17:44:50,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-09-04 17:44:50,464 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 64 [2020-09-04 17:44:50,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:44:50,465 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-09-04 17:44:50,465 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 17:44:50,465 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-09-04 17:44:50,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-09-04 17:44:50,466 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:44:50,467 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:44:50,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-04 17:44:50,467 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:44:50,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:44:50,468 INFO L82 PathProgramCache]: Analyzing trace with hash 1930216728, now seen corresponding path program 4 times [2020-09-04 17:44:50,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:44:50,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [692436854] [2020-09-04 17:44:50,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:44:50,473 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:44:50,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:51,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:44:51,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:51,282 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 17:44:51,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [692436854] [2020-09-04 17:44:51,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:44:51,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [] total 23 [2020-09-04 17:44:51,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117597435] [2020-09-04 17:44:51,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-04 17:44:51,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:44:51,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-04 17:44:51,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=440, Unknown=0, NotChecked=0, Total=506 [2020-09-04 17:44:51,285 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 23 states. [2020-09-04 17:44:53,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:44:53,381 INFO L93 Difference]: Finished difference Result 191 states and 200 transitions. [2020-09-04 17:44:53,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-09-04 17:44:53,381 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 65 [2020-09-04 17:44:53,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:44:53,383 INFO L225 Difference]: With dead ends: 191 [2020-09-04 17:44:53,383 INFO L226 Difference]: Without dead ends: 189 [2020-09-04 17:44:53,385 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=499, Invalid=2693, Unknown=0, NotChecked=0, Total=3192 [2020-09-04 17:44:53,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-09-04 17:44:53,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 117. [2020-09-04 17:44:53,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-09-04 17:44:53,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 121 transitions. [2020-09-04 17:44:53,406 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 121 transitions. Word has length 65 [2020-09-04 17:44:53,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:44:53,406 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 121 transitions. [2020-09-04 17:44:53,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-04 17:44:53,407 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 121 transitions. [2020-09-04 17:44:53,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-09-04 17:44:53,408 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:44:53,408 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:44:53,408 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-04 17:44:53,408 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:44:53,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:44:53,409 INFO L82 PathProgramCache]: Analyzing trace with hash 499090838, now seen corresponding path program 5 times [2020-09-04 17:44:53,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:44:53,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [216617397] [2020-09-04 17:44:53,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:44:53,419 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:44:53,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:53,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:44:53,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:53,564 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 17:44:53,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [216617397] [2020-09-04 17:44:53,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:44:53,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-09-04 17:44:53,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555322867] [2020-09-04 17:44:53,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-04 17:44:53,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:44:53,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-04 17:44:53,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-09-04 17:44:53,571 INFO L87 Difference]: Start difference. First operand 117 states and 121 transitions. Second operand 12 states. [2020-09-04 17:44:54,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:44:54,177 INFO L93 Difference]: Finished difference Result 193 states and 202 transitions. [2020-09-04 17:44:54,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-04 17:44:54,177 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 72 [2020-09-04 17:44:54,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:44:54,180 INFO L225 Difference]: With dead ends: 193 [2020-09-04 17:44:54,180 INFO L226 Difference]: Without dead ends: 173 [2020-09-04 17:44:54,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=124, Invalid=476, Unknown=0, NotChecked=0, Total=600 [2020-09-04 17:44:54,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2020-09-04 17:44:54,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 127. [2020-09-04 17:44:54,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-09-04 17:44:54,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 131 transitions. [2020-09-04 17:44:54,218 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 131 transitions. Word has length 72 [2020-09-04 17:44:54,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:44:54,218 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 131 transitions. [2020-09-04 17:44:54,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-04 17:44:54,218 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 131 transitions. [2020-09-04 17:44:54,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-09-04 17:44:54,219 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:44:54,220 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:44:54,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-04 17:44:54,220 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:44:54,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:44:54,220 INFO L82 PathProgramCache]: Analyzing trace with hash 1430946398, now seen corresponding path program 6 times [2020-09-04 17:44:54,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:44:54,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1140770647] [2020-09-04 17:44:54,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:44:54,226 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:44:54,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:54,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 17:44:54,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 17:44:54,351 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 17:44:54,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1140770647] [2020-09-04 17:44:54,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 17:44:54,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-09-04 17:44:54,353 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175511679] [2020-09-04 17:44:54,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-04 17:44:54,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 17:44:54,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-04 17:44:54,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-09-04 17:44:54,354 INFO L87 Difference]: Start difference. First operand 127 states and 131 transitions. Second operand 13 states. [2020-09-04 17:44:54,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 17:44:54,858 INFO L93 Difference]: Finished difference Result 192 states and 199 transitions. [2020-09-04 17:44:54,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-04 17:44:54,858 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 75 [2020-09-04 17:44:54,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 17:44:54,859 INFO L225 Difference]: With dead ends: 192 [2020-09-04 17:44:54,859 INFO L226 Difference]: Without dead ends: 162 [2020-09-04 17:44:54,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=150, Invalid=500, Unknown=0, NotChecked=0, Total=650 [2020-09-04 17:44:54,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-09-04 17:44:54,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 127. [2020-09-04 17:44:54,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-09-04 17:44:54,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 130 transitions. [2020-09-04 17:44:54,878 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 130 transitions. Word has length 75 [2020-09-04 17:44:54,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 17:44:54,879 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 130 transitions. [2020-09-04 17:44:54,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-04 17:44:54,879 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 130 transitions. [2020-09-04 17:44:54,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-09-04 17:44:54,880 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 17:44:54,880 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 17:44:54,880 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-04 17:44:54,880 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 17:44:54,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 17:44:54,881 INFO L82 PathProgramCache]: Analyzing trace with hash 810536514, now seen corresponding path program 2 times [2020-09-04 17:44:54,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 17:44:54,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2021223106] [2020-09-04 17:44:54,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 17:44:54,888 INFO L283 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-09-04 17:44:54,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 17:44:54,910 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 17:44:54,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 17:44:54,937 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 17:44:54,974 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-04 17:44:54,974 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 17:44:54,975 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-04 17:44:55,000 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 05:44:55 BoogieIcfgContainer [2020-09-04 17:44:55,000 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 17:44:55,004 INFO L168 Benchmark]: Toolchain (without parser) took 11848.33 ms. Allocated memory was 140.0 MB in the beginning and 315.6 MB in the end (delta: 175.6 MB). Free memory was 103.9 MB in the beginning and 164.7 MB in the end (delta: -60.9 MB). Peak memory consumption was 114.8 MB. Max. memory is 7.1 GB. [2020-09-04 17:44:55,005 INFO L168 Benchmark]: CDTParser took 0.31 ms. Allocated memory is still 140.0 MB. Free memory was 122.4 MB in the beginning and 122.0 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. [2020-09-04 17:44:55,006 INFO L168 Benchmark]: CACSL2BoogieTranslator took 452.73 ms. Allocated memory is still 140.0 MB. Free memory was 103.9 MB in the beginning and 93.5 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-09-04 17:44:55,007 INFO L168 Benchmark]: Boogie Preprocessor took 173.41 ms. Allocated memory was 140.0 MB in the beginning and 205.0 MB in the end (delta: 65.0 MB). Free memory was 93.5 MB in the beginning and 182.4 MB in the end (delta: -88.9 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-09-04 17:44:55,007 INFO L168 Benchmark]: RCFGBuilder took 480.97 ms. Allocated memory is still 205.0 MB. Free memory was 182.4 MB in the beginning and 163.3 MB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 7.1 GB. [2020-09-04 17:44:55,008 INFO L168 Benchmark]: TraceAbstraction took 10734.06 ms. Allocated memory was 205.0 MB in the beginning and 315.6 MB in the end (delta: 110.6 MB). Free memory was 162.4 MB in the beginning and 164.7 MB in the end (delta: -2.4 MB). Peak memory consumption was 108.3 MB. Max. memory is 7.1 GB. [2020-09-04 17:44:55,011 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.31 ms. Allocated memory is still 140.0 MB. Free memory was 122.4 MB in the beginning and 122.0 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 452.73 ms. Allocated memory is still 140.0 MB. Free memory was 103.9 MB in the beginning and 93.5 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 173.41 ms. Allocated memory was 140.0 MB in the beginning and 205.0 MB in the end (delta: 65.0 MB). Free memory was 93.5 MB in the beginning and 182.4 MB in the end (delta: -88.9 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 480.97 ms. Allocated memory is still 205.0 MB. Free memory was 182.4 MB in the beginning and 163.3 MB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 10734.06 ms. Allocated memory was 205.0 MB in the beginning and 315.6 MB in the end (delta: 110.6 MB). Free memory was 162.4 MB in the beginning and 164.7 MB in the end (delta: -2.4 MB). Peak memory consumption was 108.3 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)) [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i