/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/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/standard_copy2_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-23 20:22:01,212 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-23 20:22:01,214 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-23 20:22:01,234 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-23 20:22:01,235 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-23 20:22:01,237 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-23 20:22:01,239 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-23 20:22:01,249 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-23 20:22:01,253 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-23 20:22:01,256 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-23 20:22:01,258 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-23 20:22:01,260 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-23 20:22:01,261 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-23 20:22:01,262 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-23 20:22:01,265 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-23 20:22:01,266 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-23 20:22:01,268 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-23 20:22:01,269 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-23 20:22:01,270 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-23 20:22:01,274 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-23 20:22:01,276 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-23 20:22:01,277 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-23 20:22:01,278 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-23 20:22:01,278 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-23 20:22:01,280 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-23 20:22:01,287 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-23 20:22:01,288 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-23 20:22:01,289 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-23 20:22:01,289 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-23 20:22:01,303 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-23 20:22:01,304 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-23 20:22:01,305 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-23 20:22:01,305 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-23 20:22:01,305 INFO L138 SettingsManager]: * Use SBE=true [2019-11-23 20:22:01,306 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-23 20:22:01,306 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-23 20:22:01,306 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-23 20:22:01,306 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-23 20:22:01,306 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-23 20:22:01,307 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-23 20:22:01,307 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-23 20:22:01,307 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-23 20:22:01,307 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-11-23 20:22:01,307 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-23 20:22:01,307 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-23 20:22:01,308 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-23 20:22:01,308 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-23 20:22:01,308 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-23 20:22:01,308 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-23 20:22:01,308 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-23 20:22:01,309 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-23 20:22:01,309 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 20:22:01,309 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-23 20:22:01,309 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-23 20:22:01,309 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-23 20:22:01,310 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-23 20:22:01,310 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-23 20:22:01,310 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-23 20:22:01,310 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-23 20:22:01,632 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-23 20:22:01,657 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-23 20:22:01,662 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-23 20:22:01,663 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-23 20:22:01,664 INFO L275 PluginConnector]: CDTParser initialized [2019-11-23 20:22:01,665 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copy2_ground-2.i [2019-11-23 20:22:01,725 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d1b75b74c/98bcd4a6a4874f319e9d1cbc943284fb/FLAGc9b83aa78 [2019-11-23 20:22:02,153 INFO L306 CDTParser]: Found 1 translation units. [2019-11-23 20:22:02,153 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copy2_ground-2.i [2019-11-23 20:22:02,160 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d1b75b74c/98bcd4a6a4874f319e9d1cbc943284fb/FLAGc9b83aa78 [2019-11-23 20:22:02,578 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d1b75b74c/98bcd4a6a4874f319e9d1cbc943284fb [2019-11-23 20:22:02,589 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-23 20:22:02,591 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-23 20:22:02,592 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-23 20:22:02,592 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-23 20:22:02,598 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-23 20:22:02,599 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:22:02" (1/1) ... [2019-11-23 20:22:02,603 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1905c6a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:02, skipping insertion in model container [2019-11-23 20:22:02,603 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:22:02" (1/1) ... [2019-11-23 20:22:02,612 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-23 20:22:02,632 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-23 20:22:02,844 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 20:22:02,848 INFO L203 MainTranslator]: Completed pre-run [2019-11-23 20:22:02,871 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 20:22:02,892 INFO L208 MainTranslator]: Completed translation [2019-11-23 20:22:02,893 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:02 WrapperNode [2019-11-23 20:22:02,893 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-23 20:22:02,894 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-23 20:22:02,894 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-23 20:22:02,894 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-23 20:22:02,902 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:02" (1/1) ... [2019-11-23 20:22:02,997 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:02" (1/1) ... [2019-11-23 20:22:03,034 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-23 20:22:03,034 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-23 20:22:03,034 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-23 20:22:03,034 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-23 20:22:03,044 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:02" (1/1) ... [2019-11-23 20:22:03,044 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:02" (1/1) ... [2019-11-23 20:22:03,058 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:02" (1/1) ... [2019-11-23 20:22:03,058 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:02" (1/1) ... [2019-11-23 20:22:03,071 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:02" (1/1) ... [2019-11-23 20:22:03,078 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:02" (1/1) ... [2019-11-23 20:22:03,079 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:02" (1/1) ... [2019-11-23 20:22:03,081 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-23 20:22:03,082 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-23 20:22:03,082 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-23 20:22:03,082 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-23 20:22:03,083 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 20:22:03,136 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-23 20:22:03,138 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-23 20:22:03,138 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-23 20:22:03,138 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-23 20:22:03,139 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-23 20:22:03,139 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-23 20:22:03,373 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-23 20:22:03,374 INFO L284 CfgBuilder]: Removed 10 assume(true) statements. [2019-11-23 20:22:03,375 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:22:03 BoogieIcfgContainer [2019-11-23 20:22:03,376 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-23 20:22:03,377 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-23 20:22:03,377 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-23 20:22:03,380 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-23 20:22:03,381 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:22:02" (1/3) ... [2019-11-23 20:22:03,382 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c19c509 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:22:03, skipping insertion in model container [2019-11-23 20:22:03,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:22:02" (2/3) ... [2019-11-23 20:22:03,382 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6c19c509 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:22:03, skipping insertion in model container [2019-11-23 20:22:03,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:22:03" (3/3) ... [2019-11-23 20:22:03,387 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copy2_ground-2.i [2019-11-23 20:22:03,404 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-23 20:22:03,414 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-23 20:22:03,449 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-23 20:22:03,480 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-23 20:22:03,480 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-23 20:22:03,480 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-23 20:22:03,480 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-23 20:22:03,480 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-23 20:22:03,480 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-23 20:22:03,481 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-23 20:22:03,481 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-23 20:22:03,498 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-11-23 20:22:03,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-23 20:22:03,506 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:03,506 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:03,507 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:03,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:03,512 INFO L82 PathProgramCache]: Analyzing trace with hash -779788197, now seen corresponding path program 1 times [2019-11-23 20:22:03,520 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:03,521 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1554008385] [2019-11-23 20:22:03,521 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:03,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:03,680 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 20:22:03,681 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1554008385] [2019-11-23 20:22:03,683 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 20:22:03,683 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 20:22:03,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491993870] [2019-11-23 20:22:03,690 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 20:22:03,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:03,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 20:22:03,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:22:03,710 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2019-11-23 20:22:03,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:03,763 INFO L93 Difference]: Finished difference Result 40 states and 56 transitions. [2019-11-23 20:22:03,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 20:22:03,765 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-11-23 20:22:03,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:03,773 INFO L225 Difference]: With dead ends: 40 [2019-11-23 20:22:03,773 INFO L226 Difference]: Without dead ends: 19 [2019-11-23 20:22:03,776 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:22:03,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-23 20:22:03,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2019-11-23 20:22:03,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-11-23 20:22:03,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2019-11-23 20:22:03,810 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 11 [2019-11-23 20:22:03,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:03,811 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2019-11-23 20:22:03,811 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 20:22:03,811 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2019-11-23 20:22:03,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-23 20:22:03,812 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:03,812 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:03,813 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:03,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:03,813 INFO L82 PathProgramCache]: Analyzing trace with hash 383923737, now seen corresponding path program 1 times [2019-11-23 20:22:03,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:03,814 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639634090] [2019-11-23 20:22:03,814 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:03,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:03,867 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 20:22:03,868 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639634090] [2019-11-23 20:22:03,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 20:22:03,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 20:22:03,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826017574] [2019-11-23 20:22:03,871 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 20:22:03,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:03,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 20:22:03,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:22:03,872 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand 3 states. [2019-11-23 20:22:03,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:03,923 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2019-11-23 20:22:03,924 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 20:22:03,924 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-11-23 20:22:03,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:03,925 INFO L225 Difference]: With dead ends: 32 [2019-11-23 20:22:03,925 INFO L226 Difference]: Without dead ends: 22 [2019-11-23 20:22:03,927 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 20:22:03,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-23 20:22:03,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2019-11-23 20:22:03,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-23 20:22:03,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2019-11-23 20:22:03,932 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 13 [2019-11-23 20:22:03,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:03,933 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2019-11-23 20:22:03,933 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 20:22:03,933 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2019-11-23 20:22:03,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-23 20:22:03,934 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:03,934 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:03,935 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:03,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:03,935 INFO L82 PathProgramCache]: Analyzing trace with hash 1602849365, now seen corresponding path program 1 times [2019-11-23 20:22:03,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:03,936 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1102421545] [2019-11-23 20:22:03,936 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:03,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:04,015 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-23 20:22:04,016 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1102421545] [2019-11-23 20:22:04,016 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581611169] [2019-11-23 20:22:04,017 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:04,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:04,087 INFO L255 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 20:22:04,093 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:04,127 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-23 20:22:04,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:04,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2019-11-23 20:22:04,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442696970] [2019-11-23 20:22:04,129 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-23 20:22:04,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:04,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-23 20:22:04,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 20:22:04,130 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand 5 states. [2019-11-23 20:22:04,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:04,163 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2019-11-23 20:22:04,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 20:22:04,165 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2019-11-23 20:22:04,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:04,165 INFO L225 Difference]: With dead ends: 38 [2019-11-23 20:22:04,167 INFO L226 Difference]: Without dead ends: 23 [2019-11-23 20:22:04,167 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 20:22:04,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-23 20:22:04,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2019-11-23 20:22:04,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-23 20:22:04,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2019-11-23 20:22:04,178 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 17 [2019-11-23 20:22:04,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:04,180 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2019-11-23 20:22:04,180 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-23 20:22:04,180 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2019-11-23 20:22:04,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-23 20:22:04,182 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:04,182 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:04,387 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:04,389 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:04,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:04,389 INFO L82 PathProgramCache]: Analyzing trace with hash 34773395, now seen corresponding path program 2 times [2019-11-23 20:22:04,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:04,390 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439691249] [2019-11-23 20:22:04,390 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:04,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:04,462 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-23 20:22:04,463 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439691249] [2019-11-23 20:22:04,463 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1011256059] [2019-11-23 20:22:04,463 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:04,517 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:22:04,517 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:04,518 INFO L255 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-23 20:22:04,520 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:04,533 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-23 20:22:04,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:04,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2019-11-23 20:22:04,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086129308] [2019-11-23 20:22:04,535 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-23 20:22:04,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:04,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-23 20:22:04,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-23 20:22:04,537 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 6 states. [2019-11-23 20:22:04,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:04,577 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2019-11-23 20:22:04,577 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-23 20:22:04,577 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2019-11-23 20:22:04,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:04,578 INFO L225 Difference]: With dead ends: 40 [2019-11-23 20:22:04,579 INFO L226 Difference]: Without dead ends: 25 [2019-11-23 20:22:04,579 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-23 20:22:04,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-23 20:22:04,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2019-11-23 20:22:04,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-23 20:22:04,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2019-11-23 20:22:04,585 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 19 [2019-11-23 20:22:04,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:04,586 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2019-11-23 20:22:04,586 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-23 20:22:04,586 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2019-11-23 20:22:04,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-23 20:22:04,587 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:04,587 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:04,791 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:04,792 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:04,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:04,792 INFO L82 PathProgramCache]: Analyzing trace with hash 647287121, now seen corresponding path program 3 times [2019-11-23 20:22:04,793 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:04,793 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074696194] [2019-11-23 20:22:04,793 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:04,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:04,921 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-23 20:22:04,922 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074696194] [2019-11-23 20:22:04,922 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120491148] [2019-11-23 20:22:04,922 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:04,999 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-23 20:22:05,000 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:05,001 INFO L255 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 20:22:05,004 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:05,038 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-23 20:22:05,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:05,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 8 [2019-11-23 20:22:05,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515616503] [2019-11-23 20:22:05,040 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-23 20:22:05,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:05,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-23 20:22:05,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2019-11-23 20:22:05,041 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 8 states. [2019-11-23 20:22:05,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:05,134 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2019-11-23 20:22:05,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-23 20:22:05,136 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2019-11-23 20:22:05,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:05,137 INFO L225 Difference]: With dead ends: 48 [2019-11-23 20:22:05,137 INFO L226 Difference]: Without dead ends: 33 [2019-11-23 20:22:05,139 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2019-11-23 20:22:05,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-11-23 20:22:05,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2019-11-23 20:22:05,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-23 20:22:05,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2019-11-23 20:22:05,151 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 21 [2019-11-23 20:22:05,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:05,151 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2019-11-23 20:22:05,151 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-23 20:22:05,152 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2019-11-23 20:22:05,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-23 20:22:05,154 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:05,154 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:05,358 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:05,358 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:05,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:05,359 INFO L82 PathProgramCache]: Analyzing trace with hash -1515345205, now seen corresponding path program 4 times [2019-11-23 20:22:05,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:05,360 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774245269] [2019-11-23 20:22:05,360 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:05,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:05,451 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-23 20:22:05,451 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774245269] [2019-11-23 20:22:05,452 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1207859741] [2019-11-23 20:22:05,452 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:05,501 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 20:22:05,501 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:05,502 INFO L255 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-23 20:22:05,504 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:05,527 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-23 20:22:05,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:05,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2019-11-23 20:22:05,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664413472] [2019-11-23 20:22:05,530 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-23 20:22:05,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:05,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-23 20:22:05,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-23 20:22:05,538 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2019-11-23 20:22:05,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:05,573 INFO L93 Difference]: Finished difference Result 52 states and 58 transitions. [2019-11-23 20:22:05,573 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-23 20:22:05,574 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2019-11-23 20:22:05,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:05,574 INFO L225 Difference]: With dead ends: 52 [2019-11-23 20:22:05,575 INFO L226 Difference]: Without dead ends: 33 [2019-11-23 20:22:05,575 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-23 20:22:05,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-11-23 20:22:05,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2019-11-23 20:22:05,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-23 20:22:05,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2019-11-23 20:22:05,580 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2019-11-23 20:22:05,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:05,580 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2019-11-23 20:22:05,580 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-23 20:22:05,581 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2019-11-23 20:22:05,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-23 20:22:05,581 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:05,582 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:05,782 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:05,783 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:05,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:05,784 INFO L82 PathProgramCache]: Analyzing trace with hash -422361975, now seen corresponding path program 5 times [2019-11-23 20:22:05,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:05,785 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840927478] [2019-11-23 20:22:05,785 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:05,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:05,881 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-11-23 20:22:05,882 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840927478] [2019-11-23 20:22:05,882 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1586807645] [2019-11-23 20:22:05,882 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:05,980 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-23 20:22:05,980 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:05,981 INFO L255 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-23 20:22:05,983 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:06,023 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2019-11-23 20:22:06,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:06,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 11 [2019-11-23 20:22:06,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006316468] [2019-11-23 20:22:06,026 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-23 20:22:06,027 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:06,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-23 20:22:06,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2019-11-23 20:22:06,027 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 11 states. [2019-11-23 20:22:06,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:06,125 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2019-11-23 20:22:06,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-23 20:22:06,126 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2019-11-23 20:22:06,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:06,126 INFO L225 Difference]: With dead ends: 60 [2019-11-23 20:22:06,127 INFO L226 Difference]: Without dead ends: 41 [2019-11-23 20:22:06,127 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2019-11-23 20:22:06,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-11-23 20:22:06,137 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2019-11-23 20:22:06,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-23 20:22:06,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2019-11-23 20:22:06,142 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 29 [2019-11-23 20:22:06,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:06,142 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2019-11-23 20:22:06,142 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-23 20:22:06,142 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2019-11-23 20:22:06,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-23 20:22:06,143 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:06,143 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:06,348 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:06,348 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:06,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:06,349 INFO L82 PathProgramCache]: Analyzing trace with hash 2041222147, now seen corresponding path program 6 times [2019-11-23 20:22:06,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:06,350 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065169389] [2019-11-23 20:22:06,350 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:06,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:06,456 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-11-23 20:22:06,457 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065169389] [2019-11-23 20:22:06,457 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941883521] [2019-11-23 20:22:06,457 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:06,548 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-23 20:22:06,548 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:06,549 INFO L255 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-23 20:22:06,551 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:06,602 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-11-23 20:22:06,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:06,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 13 [2019-11-23 20:22:06,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189360601] [2019-11-23 20:22:06,604 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-23 20:22:06,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:06,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-23 20:22:06,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2019-11-23 20:22:06,605 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand 13 states. [2019-11-23 20:22:06,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:06,749 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2019-11-23 20:22:06,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-23 20:22:06,750 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2019-11-23 20:22:06,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:06,751 INFO L225 Difference]: With dead ends: 70 [2019-11-23 20:22:06,751 INFO L226 Difference]: Without dead ends: 47 [2019-11-23 20:22:06,753 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2019-11-23 20:22:06,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-23 20:22:06,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2019-11-23 20:22:06,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-11-23 20:22:06,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2019-11-23 20:22:06,766 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 35 [2019-11-23 20:22:06,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:06,766 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2019-11-23 20:22:06,766 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-23 20:22:06,767 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2019-11-23 20:22:06,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-11-23 20:22:06,768 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:06,769 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:06,974 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:06,975 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:06,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:06,975 INFO L82 PathProgramCache]: Analyzing trace with hash -190930947, now seen corresponding path program 7 times [2019-11-23 20:22:06,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:06,976 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652363260] [2019-11-23 20:22:06,976 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:07,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:07,128 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-11-23 20:22:07,129 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652363260] [2019-11-23 20:22:07,129 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1989718596] [2019-11-23 20:22:07,129 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:07,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:07,181 INFO L255 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-23 20:22:07,183 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:07,201 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-11-23 20:22:07,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:07,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2019-11-23 20:22:07,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715554377] [2019-11-23 20:22:07,203 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-23 20:22:07,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:07,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-23 20:22:07,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-23 20:22:07,204 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 11 states. [2019-11-23 20:22:07,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:07,238 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2019-11-23 20:22:07,239 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-23 20:22:07,239 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2019-11-23 20:22:07,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:07,240 INFO L225 Difference]: With dead ends: 74 [2019-11-23 20:22:07,240 INFO L226 Difference]: Without dead ends: 47 [2019-11-23 20:22:07,241 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2019-11-23 20:22:07,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-11-23 20:22:07,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-11-23 20:22:07,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-23 20:22:07,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2019-11-23 20:22:07,248 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 41 [2019-11-23 20:22:07,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:07,248 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2019-11-23 20:22:07,249 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-23 20:22:07,249 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2019-11-23 20:22:07,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-11-23 20:22:07,250 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:07,250 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:07,457 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:07,457 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:07,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:07,458 INFO L82 PathProgramCache]: Analyzing trace with hash -1537387205, now seen corresponding path program 8 times [2019-11-23 20:22:07,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:07,458 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [225040465] [2019-11-23 20:22:07,459 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:07,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:07,563 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-11-23 20:22:07,563 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [225040465] [2019-11-23 20:22:07,564 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208382989] [2019-11-23 20:22:07,564 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:07,620 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:22:07,621 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:07,622 INFO L255 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-23 20:22:07,631 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:07,656 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-11-23 20:22:07,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:07,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2019-11-23 20:22:07,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979479582] [2019-11-23 20:22:07,657 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-23 20:22:07,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:07,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-23 20:22:07,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-11-23 20:22:07,658 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 12 states. [2019-11-23 20:22:07,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:07,709 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2019-11-23 20:22:07,711 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-23 20:22:07,712 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 43 [2019-11-23 20:22:07,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:07,713 INFO L225 Difference]: With dead ends: 76 [2019-11-23 20:22:07,713 INFO L226 Difference]: Without dead ends: 49 [2019-11-23 20:22:07,714 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2019-11-23 20:22:07,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-23 20:22:07,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2019-11-23 20:22:07,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-23 20:22:07,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2019-11-23 20:22:07,723 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 43 [2019-11-23 20:22:07,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:07,723 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2019-11-23 20:22:07,723 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-23 20:22:07,724 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2019-11-23 20:22:07,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-23 20:22:07,724 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:07,725 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:07,931 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:07,932 INFO L410 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:07,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:07,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1598272249, now seen corresponding path program 9 times [2019-11-23 20:22:07,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:07,936 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067380706] [2019-11-23 20:22:07,936 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:07,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:08,088 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-11-23 20:22:08,088 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067380706] [2019-11-23 20:22:08,088 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [121045713] [2019-11-23 20:22:08,089 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:08,147 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-11-23 20:22:08,147 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:08,148 INFO L255 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-23 20:22:08,151 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:08,208 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2019-11-23 20:22:08,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:08,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 17 [2019-11-23 20:22:08,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [735462531] [2019-11-23 20:22:08,210 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-23 20:22:08,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:08,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-23 20:22:08,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=186, Unknown=0, NotChecked=0, Total=272 [2019-11-23 20:22:08,211 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 17 states. [2019-11-23 20:22:08,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:08,357 INFO L93 Difference]: Finished difference Result 84 states and 92 transitions. [2019-11-23 20:22:08,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-23 20:22:08,357 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 45 [2019-11-23 20:22:08,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:08,358 INFO L225 Difference]: With dead ends: 84 [2019-11-23 20:22:08,358 INFO L226 Difference]: Without dead ends: 57 [2019-11-23 20:22:08,359 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=186, Unknown=0, NotChecked=0, Total=272 [2019-11-23 20:22:08,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-11-23 20:22:08,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2019-11-23 20:22:08,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-11-23 20:22:08,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2019-11-23 20:22:08,364 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 45 [2019-11-23 20:22:08,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:08,365 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2019-11-23 20:22:08,365 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-23 20:22:08,365 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2019-11-23 20:22:08,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-23 20:22:08,366 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:08,366 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:08,575 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:08,576 INFO L410 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:08,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:08,576 INFO L82 PathProgramCache]: Analyzing trace with hash 1964633715, now seen corresponding path program 10 times [2019-11-23 20:22:08,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:08,576 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927305075] [2019-11-23 20:22:08,577 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:08,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:08,727 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-11-23 20:22:08,728 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927305075] [2019-11-23 20:22:08,728 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992865884] [2019-11-23 20:22:08,728 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:08,797 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 20:22:08,797 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:08,798 INFO L255 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-23 20:22:08,800 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:08,832 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-11-23 20:22:08,832 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:08,832 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2019-11-23 20:22:08,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778618969] [2019-11-23 20:22:08,833 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-23 20:22:08,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:08,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-23 20:22:08,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2019-11-23 20:22:08,834 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand 14 states. [2019-11-23 20:22:08,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:08,878 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2019-11-23 20:22:08,878 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-23 20:22:08,878 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 51 [2019-11-23 20:22:08,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:08,879 INFO L225 Difference]: With dead ends: 88 [2019-11-23 20:22:08,879 INFO L226 Difference]: Without dead ends: 57 [2019-11-23 20:22:08,879 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2019-11-23 20:22:08,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-11-23 20:22:08,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2019-11-23 20:22:08,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-11-23 20:22:08,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2019-11-23 20:22:08,885 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 51 [2019-11-23 20:22:08,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:08,886 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2019-11-23 20:22:08,886 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-23 20:22:08,886 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2019-11-23 20:22:08,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-11-23 20:22:08,887 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:08,887 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:09,097 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:09,098 INFO L410 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:09,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:09,099 INFO L82 PathProgramCache]: Analyzing trace with hash -786584015, now seen corresponding path program 11 times [2019-11-23 20:22:09,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:09,100 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566747506] [2019-11-23 20:22:09,100 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:09,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:09,258 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-11-23 20:22:09,259 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566747506] [2019-11-23 20:22:09,259 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579120678] [2019-11-23 20:22:09,259 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:10,802 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-23 20:22:10,802 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:10,807 INFO L255 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-23 20:22:10,809 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:10,906 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-11-23 20:22:10,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:10,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 20 [2019-11-23 20:22:10,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019802771] [2019-11-23 20:22:10,908 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-23 20:22:10,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:10,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-23 20:22:10,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2019-11-23 20:22:10,909 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand 20 states. [2019-11-23 20:22:11,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:11,087 INFO L93 Difference]: Finished difference Result 96 states and 104 transitions. [2019-11-23 20:22:11,087 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-23 20:22:11,087 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 53 [2019-11-23 20:22:11,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:11,089 INFO L225 Difference]: With dead ends: 96 [2019-11-23 20:22:11,089 INFO L226 Difference]: Without dead ends: 65 [2019-11-23 20:22:11,090 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2019-11-23 20:22:11,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-11-23 20:22:11,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2019-11-23 20:22:11,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-11-23 20:22:11,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 65 transitions. [2019-11-23 20:22:11,097 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 65 transitions. Word has length 53 [2019-11-23 20:22:11,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:11,097 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 65 transitions. [2019-11-23 20:22:11,097 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-23 20:22:11,097 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 65 transitions. [2019-11-23 20:22:11,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-11-23 20:22:11,098 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:11,098 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:11,305 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:11,306 INFO L410 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:11,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:11,306 INFO L82 PathProgramCache]: Analyzing trace with hash 607412139, now seen corresponding path program 12 times [2019-11-23 20:22:11,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:11,307 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201975791] [2019-11-23 20:22:11,307 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:11,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:11,486 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2019-11-23 20:22:11,487 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201975791] [2019-11-23 20:22:11,487 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853295473] [2019-11-23 20:22:11,487 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:13,506 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-23 20:22:13,506 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:13,511 INFO L255 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-23 20:22:13,513 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:13,627 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2019-11-23 20:22:13,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:13,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 9] total 22 [2019-11-23 20:22:13,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769993525] [2019-11-23 20:22:13,629 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-23 20:22:13,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:13,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-23 20:22:13,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=322, Unknown=0, NotChecked=0, Total=462 [2019-11-23 20:22:13,630 INFO L87 Difference]: Start difference. First operand 62 states and 65 transitions. Second operand 22 states. [2019-11-23 20:22:13,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:13,775 INFO L93 Difference]: Finished difference Result 106 states and 114 transitions. [2019-11-23 20:22:13,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-23 20:22:13,775 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 59 [2019-11-23 20:22:13,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:13,776 INFO L225 Difference]: With dead ends: 106 [2019-11-23 20:22:13,776 INFO L226 Difference]: Without dead ends: 71 [2019-11-23 20:22:13,777 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=140, Invalid=322, Unknown=0, NotChecked=0, Total=462 [2019-11-23 20:22:13,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-11-23 20:22:13,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2019-11-23 20:22:13,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-11-23 20:22:13,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 71 transitions. [2019-11-23 20:22:13,783 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 71 transitions. Word has length 59 [2019-11-23 20:22:13,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:13,783 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 71 transitions. [2019-11-23 20:22:13,783 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-23 20:22:13,784 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 71 transitions. [2019-11-23 20:22:13,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-11-23 20:22:13,784 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:13,785 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:13,991 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:13,991 INFO L410 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:13,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:13,992 INFO L82 PathProgramCache]: Analyzing trace with hash -1826730587, now seen corresponding path program 13 times [2019-11-23 20:22:13,992 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:13,992 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863416383] [2019-11-23 20:22:13,992 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:14,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:14,169 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-11-23 20:22:14,169 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1863416383] [2019-11-23 20:22:14,169 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [480716677] [2019-11-23 20:22:14,170 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:14,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:14,231 INFO L255 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-23 20:22:14,232 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:14,254 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-11-23 20:22:14,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:14,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2019-11-23 20:22:14,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589473529] [2019-11-23 20:22:14,256 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-23 20:22:14,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:14,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-23 20:22:14,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2019-11-23 20:22:14,257 INFO L87 Difference]: Start difference. First operand 68 states and 71 transitions. Second operand 17 states. [2019-11-23 20:22:14,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:14,325 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2019-11-23 20:22:14,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-23 20:22:14,325 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2019-11-23 20:22:14,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:14,326 INFO L225 Difference]: With dead ends: 110 [2019-11-23 20:22:14,326 INFO L226 Difference]: Without dead ends: 71 [2019-11-23 20:22:14,327 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2019-11-23 20:22:14,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-11-23 20:22:14,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2019-11-23 20:22:14,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-11-23 20:22:14,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 73 transitions. [2019-11-23 20:22:14,332 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 73 transitions. Word has length 65 [2019-11-23 20:22:14,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:14,332 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 73 transitions. [2019-11-23 20:22:14,332 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-23 20:22:14,333 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 73 transitions. [2019-11-23 20:22:14,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-11-23 20:22:14,333 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:14,334 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:14,539 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:14,539 INFO L410 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:14,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:14,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1828673309, now seen corresponding path program 14 times [2019-11-23 20:22:14,540 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:14,540 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941527229] [2019-11-23 20:22:14,540 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:14,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:14,706 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-11-23 20:22:14,707 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941527229] [2019-11-23 20:22:14,707 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355155524] [2019-11-23 20:22:14,707 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:14,764 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 20:22:14,764 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:14,765 INFO L255 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-23 20:22:14,767 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:14,783 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-11-23 20:22:14,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:14,784 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2019-11-23 20:22:14,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264810461] [2019-11-23 20:22:14,784 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-23 20:22:14,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:14,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-23 20:22:14,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2019-11-23 20:22:14,785 INFO L87 Difference]: Start difference. First operand 70 states and 73 transitions. Second operand 18 states. [2019-11-23 20:22:14,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:14,849 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2019-11-23 20:22:14,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-23 20:22:14,850 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 67 [2019-11-23 20:22:14,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:14,851 INFO L225 Difference]: With dead ends: 112 [2019-11-23 20:22:14,851 INFO L226 Difference]: Without dead ends: 73 [2019-11-23 20:22:14,852 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2019-11-23 20:22:14,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-11-23 20:22:14,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 72. [2019-11-23 20:22:14,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-11-23 20:22:14,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 75 transitions. [2019-11-23 20:22:14,857 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 75 transitions. Word has length 67 [2019-11-23 20:22:14,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:14,857 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 75 transitions. [2019-11-23 20:22:14,857 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-23 20:22:14,857 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 75 transitions. [2019-11-23 20:22:14,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-11-23 20:22:14,858 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:14,858 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:15,061 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:15,061 INFO L410 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:15,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:15,062 INFO L82 PathProgramCache]: Analyzing trace with hash 599338145, now seen corresponding path program 15 times [2019-11-23 20:22:15,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:15,063 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [158971499] [2019-11-23 20:22:15,063 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:15,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:15,267 INFO L134 CoverageAnalysis]: Checked inductivity of 323 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-11-23 20:22:15,267 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [158971499] [2019-11-23 20:22:15,268 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35199655] [2019-11-23 20:22:15,268 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:15,791 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2019-11-23 20:22:15,792 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:15,793 INFO L255 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-23 20:22:15,794 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:15,924 INFO L134 CoverageAnalysis]: Checked inductivity of 323 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 274 trivial. 0 not checked. [2019-11-23 20:22:15,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:15,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 10] total 26 [2019-11-23 20:22:15,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1226382776] [2019-11-23 20:22:15,926 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-23 20:22:15,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:15,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-23 20:22:15,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=453, Unknown=0, NotChecked=0, Total=650 [2019-11-23 20:22:15,927 INFO L87 Difference]: Start difference. First operand 72 states and 75 transitions. Second operand 26 states. [2019-11-23 20:22:16,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:16,105 INFO L93 Difference]: Finished difference Result 120 states and 128 transitions. [2019-11-23 20:22:16,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-23 20:22:16,106 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 69 [2019-11-23 20:22:16,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:16,107 INFO L225 Difference]: With dead ends: 120 [2019-11-23 20:22:16,107 INFO L226 Difference]: Without dead ends: 81 [2019-11-23 20:22:16,108 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=197, Invalid=453, Unknown=0, NotChecked=0, Total=650 [2019-11-23 20:22:16,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2019-11-23 20:22:16,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2019-11-23 20:22:16,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2019-11-23 20:22:16,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 81 transitions. [2019-11-23 20:22:16,113 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 81 transitions. Word has length 69 [2019-11-23 20:22:16,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:16,114 INFO L462 AbstractCegarLoop]: Abstraction has 78 states and 81 transitions. [2019-11-23 20:22:16,114 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-23 20:22:16,114 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 81 transitions. [2019-11-23 20:22:16,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-11-23 20:22:16,114 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:16,115 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:16,318 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:16,319 INFO L410 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:16,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:16,320 INFO L82 PathProgramCache]: Analyzing trace with hash 198363675, now seen corresponding path program 16 times [2019-11-23 20:22:16,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:16,321 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991273060] [2019-11-23 20:22:16,321 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:16,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:16,565 INFO L134 CoverageAnalysis]: Checked inductivity of 384 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2019-11-23 20:22:16,566 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991273060] [2019-11-23 20:22:16,566 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1921525572] [2019-11-23 20:22:16,566 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:16,640 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 20:22:16,640 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:22:16,641 INFO L255 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-23 20:22:16,643 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:22:16,820 INFO L134 CoverageAnalysis]: Checked inductivity of 384 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2019-11-23 20:22:16,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:22:16,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 11] total 28 [2019-11-23 20:22:16,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114811640] [2019-11-23 20:22:16,821 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-23 20:22:16,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:22:16,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-23 20:22:16,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=531, Unknown=0, NotChecked=0, Total=756 [2019-11-23 20:22:16,822 INFO L87 Difference]: Start difference. First operand 78 states and 81 transitions. Second operand 28 states. [2019-11-23 20:22:17,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:22:17,011 INFO L93 Difference]: Finished difference Result 130 states and 138 transitions. [2019-11-23 20:22:17,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-23 20:22:17,012 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 75 [2019-11-23 20:22:17,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:22:17,013 INFO L225 Difference]: With dead ends: 130 [2019-11-23 20:22:17,013 INFO L226 Difference]: Without dead ends: 87 [2019-11-23 20:22:17,013 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=225, Invalid=531, Unknown=0, NotChecked=0, Total=756 [2019-11-23 20:22:17,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2019-11-23 20:22:17,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2019-11-23 20:22:17,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-11-23 20:22:17,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 87 transitions. [2019-11-23 20:22:17,019 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 87 transitions. Word has length 75 [2019-11-23 20:22:17,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:22:17,019 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 87 transitions. [2019-11-23 20:22:17,020 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-23 20:22:17,020 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 87 transitions. [2019-11-23 20:22:17,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-11-23 20:22:17,020 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:22:17,021 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:22:17,221 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:22:17,221 INFO L410 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:22:17,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:22:17,222 INFO L82 PathProgramCache]: Analyzing trace with hash 453944341, now seen corresponding path program 17 times [2019-11-23 20:22:17,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:22:17,223 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131836394] [2019-11-23 20:22:17,223 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:22:17,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:22:17,468 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-11-23 20:22:17,468 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131836394] [2019-11-23 20:22:17,469 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2142171108] [2019-11-23 20:22:17,469 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:23:38,136 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-11-23 20:23:38,137 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 20:23:38,170 INFO L255 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-23 20:23:38,171 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 20:23:38,188 INFO L134 CoverageAnalysis]: Checked inductivity of 451 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-11-23 20:23:38,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 20:23:38,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2019-11-23 20:23:38,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434672557] [2019-11-23 20:23:38,190 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-23 20:23:38,190 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 20:23:38,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-23 20:23:38,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2019-11-23 20:23:38,191 INFO L87 Difference]: Start difference. First operand 84 states and 87 transitions. Second operand 21 states. [2019-11-23 20:23:38,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 20:23:38,264 INFO L93 Difference]: Finished difference Result 134 states and 140 transitions. [2019-11-23 20:23:38,267 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-23 20:23:38,267 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 81 [2019-11-23 20:23:38,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 20:23:38,268 INFO L225 Difference]: With dead ends: 134 [2019-11-23 20:23:38,268 INFO L226 Difference]: Without dead ends: 87 [2019-11-23 20:23:38,269 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2019-11-23 20:23:38,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2019-11-23 20:23:38,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2019-11-23 20:23:38,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2019-11-23 20:23:38,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 89 transitions. [2019-11-23 20:23:38,273 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 89 transitions. Word has length 81 [2019-11-23 20:23:38,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 20:23:38,273 INFO L462 AbstractCegarLoop]: Abstraction has 86 states and 89 transitions. [2019-11-23 20:23:38,274 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-23 20:23:38,274 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 89 transitions. [2019-11-23 20:23:38,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-11-23 20:23:38,274 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 20:23:38,275 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 20:23:38,488 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 20:23:38,488 INFO L410 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 20:23:38,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 20:23:38,489 INFO L82 PathProgramCache]: Analyzing trace with hash 33473363, now seen corresponding path program 18 times [2019-11-23 20:23:38,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 20:23:38,490 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1749238250] [2019-11-23 20:23:38,490 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 20:23:38,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 20:23:38,731 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-11-23 20:23:38,732 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1749238250] [2019-11-23 20:23:38,732 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96350136] [2019-11-23 20:23:38,732 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true