/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SingleStatement --traceabstraction.use.minimal.unsat.core.enumeration false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-c90d42b [2020-09-24 15:07:23,250 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-09-24 15:07:23,294 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-24 15:07:23,295 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-24 15:07:23,296 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-24 15:07:23,297 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-24 15:07:23,298 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-24 15:07:23,299 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-24 15:07:23,301 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-24 15:07:23,304 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-24 15:07:23,306 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-24 15:07:23,307 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-24 15:07:23,309 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-24 15:07:23,310 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-24 15:07:23,313 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-24 15:07:23,324 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-24 15:07:23,325 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-24 15:07:23,326 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-24 15:07:23,327 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 [2020-09-24 15:07:23,367 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-24 15:07:23,367 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-24 15:07:23,369 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-24 15:07:23,369 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-24 15:07:23,369 INFO L138 SettingsManager]: * Use SBE=true [2020-09-24 15:07:23,370 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-24 15:07:23,370 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-24 15:07:23,371 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-24 15:07:23,371 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-24 15:07:23,371 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-24 15:07:23,371 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-24 15:07:23,371 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-24 15:07:23,372 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-24 15:07:23,372 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-24 15:07:23,372 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-24 15:07:23,372 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-24 15:07:23,372 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-24 15:07:23,373 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-24 15:07:23,373 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-24 15:07:23,373 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-24 15:07:23,373 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-24 15:07:23,374 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-24 15:07:23,375 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-24 15:07:23,375 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-24 15:07:23,375 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-24 15:07:23,376 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-24 15:07:23,376 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-24 15:07:23,376 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-24 15:07:23,376 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-24 15:07:23,376 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SingleStatement Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> false [2020-09-24 15:07:23,888 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-24 15:07:23,916 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-24 15:07:23,920 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-24 15:07:23,923 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-24 15:07:23,924 INFO L275 PluginConnector]: CDTParser initialized [2020-09-24 15:07:23,925 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-09-24 15:07:24,018 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/28b5f6ff7/e7ce4830709b406897780e4b0c0976cb/FLAG33713c93a [2020-09-24 15:07:24,563 INFO L306 CDTParser]: Found 1 translation units. [2020-09-24 15:07:24,564 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-09-24 15:07:24,573 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/28b5f6ff7/e7ce4830709b406897780e4b0c0976cb/FLAG33713c93a [2020-09-24 15:07:24,917 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/28b5f6ff7/e7ce4830709b406897780e4b0c0976cb [2020-09-24 15:07:24,933 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-24 15:07:24,939 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-24 15:07:24,941 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-24 15:07:24,941 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-24 15:07:24,945 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-24 15:07:24,946 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 03:07:24" (1/1) ... [2020-09-24 15:07:24,952 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@79d9afb7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:07:24, skipping insertion in model container [2020-09-24 15:07:24,952 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 03:07:24" (1/1) ... [2020-09-24 15:07:24,962 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-24 15:07:24,994 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-24 15:07:25,211 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 15:07:25,216 INFO L203 MainTranslator]: Completed pre-run [2020-09-24 15:07:25,242 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 15:07:25,263 INFO L208 MainTranslator]: Completed translation [2020-09-24 15:07:25,264 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:07:25 WrapperNode [2020-09-24 15:07:25,264 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-24 15:07:25,265 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-24 15:07:25,265 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-24 15:07:25,266 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-24 15:07:25,355 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:07:25" (1/1) ... [2020-09-24 15:07:25,356 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:07:25" (1/1) ... [2020-09-24 15:07:25,366 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:07:25" (1/1) ... [2020-09-24 15:07:25,366 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:07:25" (1/1) ... [2020-09-24 15:07:25,374 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:07:25" (1/1) ... [2020-09-24 15:07:25,381 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:07:25" (1/1) ... [2020-09-24 15:07:25,382 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:07:25" (1/1) ... [2020-09-24 15:07:25,385 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-24 15:07:25,385 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-24 15:07:25,385 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-24 15:07:25,385 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-24 15:07:25,387 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:07:25" (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 [2020-09-24 15:07:25,455 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-24 15:07:25,455 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-24 15:07:25,455 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-24 15:07:25,455 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-24 15:07:25,456 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-24 15:07:25,456 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-24 15:07:25,456 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-24 15:07:25,456 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-24 15:07:25,456 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-09-24 15:07:25,457 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-24 15:07:25,457 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-24 15:07:25,457 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-24 15:07:25,457 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-24 15:07:25,457 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-24 15:07:25,457 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-24 15:07:25,458 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-24 15:07:25,855 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-24 15:07:25,856 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-09-24 15:07:25,861 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 03:07:25 BoogieIcfgContainer [2020-09-24 15:07:25,862 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-24 15:07:25,863 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-24 15:07:25,863 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-24 15:07:25,867 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-24 15:07:25,867 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.09 03:07:24" (1/3) ... [2020-09-24 15:07:25,868 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c5892fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 03:07:25, skipping insertion in model container [2020-09-24 15:07:25,868 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:07:25" (2/3) ... [2020-09-24 15:07:25,869 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c5892fd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 03:07:25, skipping insertion in model container [2020-09-24 15:07:25,869 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 03:07:25" (3/3) ... [2020-09-24 15:07:25,871 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-09-24 15:07:25,883 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-24 15:07:25,893 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-24 15:07:25,915 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-24 15:07:25,945 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-24 15:07:25,945 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-24 15:07:25,945 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-24 15:07:25,946 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-24 15:07:25,946 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-24 15:07:25,946 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-24 15:07:25,946 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-24 15:07:25,946 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-24 15:07:25,968 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states. [2020-09-24 15:07:25,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-24 15:07:25,977 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:25,978 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] [2020-09-24 15:07:25,978 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:25,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:25,985 INFO L82 PathProgramCache]: Analyzing trace with hash -1584943199, now seen corresponding path program 1 times [2020-09-24 15:07:25,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:25,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [682818148] [2020-09-24 15:07:25,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:26,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:26,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:26,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:26,236 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 15:07:26,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [682818148] [2020-09-24 15:07:26,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 15:07:26,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-09-24 15:07:26,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910654857] [2020-09-24 15:07:26,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-09-24 15:07:26,247 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:26,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-09-24 15:07:26,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-09-24 15:07:26,265 INFO L87 Difference]: Start difference. First operand 66 states. Second operand 3 states. [2020-09-24 15:07:26,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:26,450 INFO L93 Difference]: Finished difference Result 121 states and 135 transitions. [2020-09-24 15:07:26,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-09-24 15:07:26,452 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-09-24 15:07:26,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:26,462 INFO L225 Difference]: With dead ends: 121 [2020-09-24 15:07:26,463 INFO L226 Difference]: Without dead ends: 57 [2020-09-24 15:07:26,468 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 [2020-09-24 15:07:26,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-09-24 15:07:26,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-09-24 15:07:26,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-09-24 15:07:26,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2020-09-24 15:07:26,520 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 31 [2020-09-24 15:07:26,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:26,521 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2020-09-24 15:07:26,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-09-24 15:07:26,522 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2020-09-24 15:07:26,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-24 15:07:26,523 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:26,523 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] [2020-09-24 15:07:26,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-24 15:07:26,524 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:26,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:26,525 INFO L82 PathProgramCache]: Analyzing trace with hash -318765620, now seen corresponding path program 1 times [2020-09-24 15:07:26,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:26,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [941369688] [2020-09-24 15:07:26,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:26,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:26,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:26,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:26,680 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 15:07:26,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [941369688] [2020-09-24 15:07:26,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 15:07:26,681 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-24 15:07:26,682 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974725165] [2020-09-24 15:07:26,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-24 15:07:26,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:26,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-24 15:07:26,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-09-24 15:07:26,685 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand 5 states. [2020-09-24 15:07:26,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:26,879 INFO L93 Difference]: Finished difference Result 107 states and 112 transitions. [2020-09-24 15:07:26,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-24 15:07:26,880 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2020-09-24 15:07:26,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:26,884 INFO L225 Difference]: With dead ends: 107 [2020-09-24 15:07:26,884 INFO L226 Difference]: Without dead ends: 74 [2020-09-24 15:07:26,886 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 [2020-09-24 15:07:26,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-09-24 15:07:26,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 58. [2020-09-24 15:07:26,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-09-24 15:07:26,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-09-24 15:07:26,904 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 31 [2020-09-24 15:07:26,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:26,904 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-09-24 15:07:26,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-24 15:07:26,905 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-09-24 15:07:26,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-09-24 15:07:26,907 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:26,907 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] [2020-09-24 15:07:26,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-24 15:07:26,908 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:26,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:26,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1837873718, now seen corresponding path program 1 times [2020-09-24 15:07:26,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:26,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022713845] [2020-09-24 15:07:26,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:26,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:26,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:27,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:27,010 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-24 15:07:27,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022713845] [2020-09-24 15:07:27,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 15:07:27,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-24 15:07:27,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090396595] [2020-09-24 15:07:27,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-24 15:07:27,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:27,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-24 15:07:27,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-24 15:07:27,014 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 5 states. [2020-09-24 15:07:27,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:27,201 INFO L93 Difference]: Finished difference Result 95 states and 99 transitions. [2020-09-24 15:07:27,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-24 15:07:27,202 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-09-24 15:07:27,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:27,204 INFO L225 Difference]: With dead ends: 95 [2020-09-24 15:07:27,204 INFO L226 Difference]: Without dead ends: 75 [2020-09-24 15:07:27,205 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 [2020-09-24 15:07:27,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-09-24 15:07:27,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 59. [2020-09-24 15:07:27,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-09-24 15:07:27,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2020-09-24 15:07:27,214 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 38 [2020-09-24 15:07:27,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:27,215 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2020-09-24 15:07:27,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-24 15:07:27,215 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2020-09-24 15:07:27,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-09-24 15:07:27,217 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:27,217 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] [2020-09-24 15:07:27,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-24 15:07:27,217 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:27,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:27,218 INFO L82 PathProgramCache]: Analyzing trace with hash -2141827952, now seen corresponding path program 1 times [2020-09-24 15:07:27,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:27,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997018363] [2020-09-24 15:07:27,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:27,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:28,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:28,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:28,421 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 15:07:28,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997018363] [2020-09-24 15:07:28,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:28,422 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-24 15:07:28,422 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110414067] [2020-09-24 15:07:28,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-24 15:07:28,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:28,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-24 15:07:28,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2020-09-24 15:07:28,424 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 19 states. [2020-09-24 15:07:30,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:30,270 INFO L93 Difference]: Finished difference Result 164 states and 173 transitions. [2020-09-24 15:07:30,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-09-24 15:07:30,272 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2020-09-24 15:07:30,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:30,275 INFO L225 Difference]: With dead ends: 164 [2020-09-24 15:07:30,275 INFO L226 Difference]: Without dead ends: 162 [2020-09-24 15:07:30,278 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 [2020-09-24 15:07:30,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-09-24 15:07:30,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 90. [2020-09-24 15:07:30,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-09-24 15:07:30,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 94 transitions. [2020-09-24 15:07:30,314 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 94 transitions. Word has length 48 [2020-09-24 15:07:30,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:30,314 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 94 transitions. [2020-09-24 15:07:30,314 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-24 15:07:30,314 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 94 transitions. [2020-09-24 15:07:30,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-09-24 15:07:30,316 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:30,317 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] [2020-09-24 15:07:30,317 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-24 15:07:30,317 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:30,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:30,318 INFO L82 PathProgramCache]: Analyzing trace with hash -523876270, now seen corresponding path program 2 times [2020-09-24 15:07:30,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:30,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [884157117] [2020-09-24 15:07:30,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:30,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:30,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:30,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:30,438 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 15:07:30,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [884157117] [2020-09-24 15:07:30,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:30,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-24 15:07:30,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240734764] [2020-09-24 15:07:30,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-24 15:07:30,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:30,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-24 15:07:30,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-09-24 15:07:30,441 INFO L87 Difference]: Start difference. First operand 90 states and 94 transitions. Second operand 9 states. [2020-09-24 15:07:30,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:30,801 INFO L93 Difference]: Finished difference Result 171 states and 180 transitions. [2020-09-24 15:07:30,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-24 15:07:30,801 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 55 [2020-09-24 15:07:30,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:30,805 INFO L225 Difference]: With dead ends: 171 [2020-09-24 15:07:30,806 INFO L226 Difference]: Without dead ends: 151 [2020-09-24 15:07:30,807 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 [2020-09-24 15:07:30,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2020-09-24 15:07:30,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 100. [2020-09-24 15:07:30,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-09-24 15:07:30,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 104 transitions. [2020-09-24 15:07:30,819 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 104 transitions. Word has length 55 [2020-09-24 15:07:30,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:30,820 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 104 transitions. [2020-09-24 15:07:30,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-24 15:07:30,820 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 104 transitions. [2020-09-24 15:07:30,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-09-24 15:07:30,822 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:30,822 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] [2020-09-24 15:07:30,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-24 15:07:30,822 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:30,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:30,823 INFO L82 PathProgramCache]: Analyzing trace with hash -2134174762, now seen corresponding path program 3 times [2020-09-24 15:07:30,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:30,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1928461025] [2020-09-24 15:07:30,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:30,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:30,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:30,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:30,967 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 15:07:30,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1928461025] [2020-09-24 15:07:30,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:30,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-24 15:07:30,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376976746] [2020-09-24 15:07:30,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-24 15:07:30,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:30,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-24 15:07:30,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-09-24 15:07:30,970 INFO L87 Difference]: Start difference. First operand 100 states and 104 transitions. Second operand 10 states. [2020-09-24 15:07:31,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:31,301 INFO L93 Difference]: Finished difference Result 165 states and 172 transitions. [2020-09-24 15:07:31,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-24 15:07:31,302 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 58 [2020-09-24 15:07:31,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:31,303 INFO L225 Difference]: With dead ends: 165 [2020-09-24 15:07:31,303 INFO L226 Difference]: Without dead ends: 135 [2020-09-24 15:07:31,306 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 [2020-09-24 15:07:31,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-09-24 15:07:31,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 100. [2020-09-24 15:07:31,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-09-24 15:07:31,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 103 transitions. [2020-09-24 15:07:31,331 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 103 transitions. Word has length 58 [2020-09-24 15:07:31,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:31,333 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 103 transitions. [2020-09-24 15:07:31,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-24 15:07:31,333 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 103 transitions. [2020-09-24 15:07:31,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-09-24 15:07:31,334 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:31,335 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] [2020-09-24 15:07:31,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-24 15:07:31,340 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:31,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:31,341 INFO L82 PathProgramCache]: Analyzing trace with hash -280271430, now seen corresponding path program 1 times [2020-09-24 15:07:31,341 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:31,341 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2044543751] [2020-09-24 15:07:31,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:31,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:31,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:31,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:31,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2020-09-24 15:07:31,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:31,499 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-24 15:07:31,500 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2044543751] [2020-09-24 15:07:31,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:31,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-24 15:07:31,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4690639] [2020-09-24 15:07:31,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-24 15:07:31,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:31,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-24 15:07:31,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-09-24 15:07:31,503 INFO L87 Difference]: Start difference. First operand 100 states and 103 transitions. Second operand 10 states. [2020-09-24 15:07:31,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:31,882 INFO L93 Difference]: Finished difference Result 143 states and 147 transitions. [2020-09-24 15:07:31,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-24 15:07:31,882 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 64 [2020-09-24 15:07:31,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:31,884 INFO L225 Difference]: With dead ends: 143 [2020-09-24 15:07:31,884 INFO L226 Difference]: Without dead ends: 92 [2020-09-24 15:07:31,885 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 [2020-09-24 15:07:31,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-09-24 15:07:31,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 76. [2020-09-24 15:07:31,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-09-24 15:07:31,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-09-24 15:07:31,898 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 64 [2020-09-24 15:07:31,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:31,898 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-09-24 15:07:31,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-24 15:07:31,899 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-09-24 15:07:31,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-09-24 15:07:31,900 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:31,900 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] [2020-09-24 15:07:31,901 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-24 15:07:31,901 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:31,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:31,901 INFO L82 PathProgramCache]: Analyzing trace with hash 1930216728, now seen corresponding path program 4 times [2020-09-24 15:07:31,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:31,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1674606877] [2020-09-24 15:07:31,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:31,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:32,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:32,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:32,789 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 15:07:32,789 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1674606877] [2020-09-24 15:07:32,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:32,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-09-24 15:07:32,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922229240] [2020-09-24 15:07:32,790 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-24 15:07:32,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:32,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-24 15:07:32,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=440, Unknown=0, NotChecked=0, Total=506 [2020-09-24 15:07:32,791 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 23 states. [2020-09-24 15:07:34,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:34,978 INFO L93 Difference]: Finished difference Result 191 states and 200 transitions. [2020-09-24 15:07:34,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-09-24 15:07:34,984 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 65 [2020-09-24 15:07:34,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:34,986 INFO L225 Difference]: With dead ends: 191 [2020-09-24 15:07:34,988 INFO L226 Difference]: Without dead ends: 189 [2020-09-24 15:07:34,990 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 696 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=499, Invalid=2693, Unknown=0, NotChecked=0, Total=3192 [2020-09-24 15:07:34,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2020-09-24 15:07:35,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 117. [2020-09-24 15:07:35,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-09-24 15:07:35,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 121 transitions. [2020-09-24 15:07:35,012 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 121 transitions. Word has length 65 [2020-09-24 15:07:35,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:35,013 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 121 transitions. [2020-09-24 15:07:35,013 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-24 15:07:35,014 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 121 transitions. [2020-09-24 15:07:35,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-09-24 15:07:35,016 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:35,017 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] [2020-09-24 15:07:35,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-24 15:07:35,017 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:35,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:35,018 INFO L82 PathProgramCache]: Analyzing trace with hash 499090838, now seen corresponding path program 5 times [2020-09-24 15:07:35,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:35,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [730658306] [2020-09-24 15:07:35,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:35,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:35,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:35,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:35,192 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 2 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 15:07:35,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [730658306] [2020-09-24 15:07:35,193 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:35,193 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-24 15:07:35,198 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342238636] [2020-09-24 15:07:35,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-24 15:07:35,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:35,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-24 15:07:35,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-09-24 15:07:35,202 INFO L87 Difference]: Start difference. First operand 117 states and 121 transitions. Second operand 12 states. [2020-09-24 15:07:35,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:35,697 INFO L93 Difference]: Finished difference Result 193 states and 202 transitions. [2020-09-24 15:07:35,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-24 15:07:35,697 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 72 [2020-09-24 15:07:35,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:35,699 INFO L225 Difference]: With dead ends: 193 [2020-09-24 15:07:35,699 INFO L226 Difference]: Without dead ends: 173 [2020-09-24 15:07:35,700 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 [2020-09-24 15:07:35,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2020-09-24 15:07:35,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 127. [2020-09-24 15:07:35,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-09-24 15:07:35,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 131 transitions. [2020-09-24 15:07:35,710 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 131 transitions. Word has length 72 [2020-09-24 15:07:35,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:35,710 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 131 transitions. [2020-09-24 15:07:35,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-24 15:07:35,711 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 131 transitions. [2020-09-24 15:07:35,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-09-24 15:07:35,712 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:35,712 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] [2020-09-24 15:07:35,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-24 15:07:35,713 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:35,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:35,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1430946398, now seen corresponding path program 6 times [2020-09-24 15:07:35,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:35,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029229930] [2020-09-24 15:07:35,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:35,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:35,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:07:35,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:07:35,854 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 33 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 15:07:35,854 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029229930] [2020-09-24 15:07:35,855 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:07:35,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-24 15:07:35,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114421074] [2020-09-24 15:07:35,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-24 15:07:35,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:07:35,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-24 15:07:35,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-09-24 15:07:35,857 INFO L87 Difference]: Start difference. First operand 127 states and 131 transitions. Second operand 13 states. [2020-09-24 15:07:36,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:07:36,373 INFO L93 Difference]: Finished difference Result 192 states and 199 transitions. [2020-09-24 15:07:36,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-09-24 15:07:36,374 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 75 [2020-09-24 15:07:36,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:07:36,375 INFO L225 Difference]: With dead ends: 192 [2020-09-24 15:07:36,375 INFO L226 Difference]: Without dead ends: 162 [2020-09-24 15:07:36,377 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 [2020-09-24 15:07:36,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-09-24 15:07:36,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 127. [2020-09-24 15:07:36,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-09-24 15:07:36,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 130 transitions. [2020-09-24 15:07:36,386 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 130 transitions. Word has length 75 [2020-09-24 15:07:36,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:07:36,386 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 130 transitions. [2020-09-24 15:07:36,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-24 15:07:36,386 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 130 transitions. [2020-09-24 15:07:36,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-09-24 15:07:36,387 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:07:36,388 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] [2020-09-24 15:07:36,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-24 15:07:36,388 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:07:36,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:07:36,388 INFO L82 PathProgramCache]: Analyzing trace with hash 810536514, now seen corresponding path program 2 times [2020-09-24 15:07:36,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:07:36,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [132665556] [2020-09-24 15:07:36,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:07:36,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-24 15:07:36,414 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-24 15:07:36,414 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-24 15:07:36,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-24 15:07:36,441 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.09 03:07:36 BoogieIcfgContainer [2020-09-24 15:07:36,441 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-24 15:07:36,445 INFO L168 Benchmark]: Toolchain (without parser) took 11509.06 ms. Allocated memory was 137.9 MB in the beginning and 348.7 MB in the end (delta: 210.8 MB). Free memory was 100.4 MB in the beginning and 290.9 MB in the end (delta: -190.5 MB). Peak memory consumption was 20.2 MB. Max. memory is 7.1 GB. [2020-09-24 15:07:36,445 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 137.9 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-09-24 15:07:36,446 INFO L168 Benchmark]: CACSL2BoogieTranslator took 324.27 ms. Allocated memory is still 137.9 MB. Free memory was 99.7 MB in the beginning and 89.3 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-09-24 15:07:36,447 INFO L168 Benchmark]: Boogie Preprocessor took 119.62 ms. Allocated memory was 137.9 MB in the beginning and 200.3 MB in the end (delta: 62.4 MB). Free memory was 89.3 MB in the beginning and 177.4 MB in the end (delta: -88.1 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. [2020-09-24 15:07:36,448 INFO L168 Benchmark]: RCFGBuilder took 476.80 ms. Allocated memory is still 200.3 MB. Free memory was 177.4 MB in the beginning and 158.9 MB in the end (delta: 18.5 MB). Peak memory consumption was 18.5 MB. Max. memory is 7.1 GB. [2020-09-24 15:07:36,449 INFO L168 Benchmark]: TraceAbstraction took 10578.33 ms. Allocated memory was 200.3 MB in the beginning and 348.7 MB in the end (delta: 148.4 MB). Free memory was 158.9 MB in the beginning and 290.9 MB in the end (delta: -132.0 MB). Peak memory consumption was 16.4 MB. Max. memory is 7.1 GB. [2020-09-24 15:07:36,452 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 137.9 MB. Free memory was 119.4 MB in the beginning and 119.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 324.27 ms. Allocated memory is still 137.9 MB. Free memory was 99.7 MB in the beginning and 89.3 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 119.62 ms. Allocated memory was 137.9 MB in the beginning and 200.3 MB in the end (delta: 62.4 MB). Free memory was 89.3 MB in the beginning and 177.4 MB in the end (delta: -88.1 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 476.80 ms. Allocated memory is still 200.3 MB. Free memory was 177.4 MB in the beginning and 158.9 MB in the end (delta: 18.5 MB). Peak memory consumption was 18.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 10578.33 ms. Allocated memory was 200.3 MB in the beginning and 348.7 MB in the end (delta: 148.4 MB). Free memory was 158.9 MB in the beginning and 290.9 MB in the end (delta: -132.0 MB). Peak memory consumption was 16.4 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