/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum01_bug02.i -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 18:43:09,443 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 18:43:09,448 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 18:43:09,490 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 18:43:09,503 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 18:43:09,504 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 18:43:09,505 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 18:43:09,506 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 18:43:09,507 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 18:43:09,509 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 18:43:09,530 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 18:43:09,532 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 18:43:09,534 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 18:43:09,536 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 18:43:09,537 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 18:43:09,538 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 18:43:09,541 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 18:43:09,551 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 18:43:09,552 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 18:43:09,553 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 18:43:09,554 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 [2020-10-23 18:43:09,586 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 18:43:09,587 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 18:43:09,590 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-23 18:43:09,590 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-23 18:43:09,590 INFO L138 SettingsManager]: * Use SBE=true [2020-10-23 18:43:09,591 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 18:43:09,592 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 18:43:09,592 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 18:43:09,593 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 18:43:09,593 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 18:43:09,593 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 18:43:09,593 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 18:43:09,594 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 18:43:09,594 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 18:43:09,595 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 18:43:09,595 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 18:43:09,595 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 18:43:09,596 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 18:43:09,596 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-23 18:43:09,596 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 18:43:09,596 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 18:43:09,596 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 18:43:09,597 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 18:43:09,597 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-23 18:43:09,597 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-23 18:43:09,597 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-23 18:43:09,597 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-23 18:43:09,598 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 18:43:09,598 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-23 18:43:09,598 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 18:43:09,965 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 18:43:09,992 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 18:43:09,995 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 18:43:09,996 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 18:43:09,997 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 18:43:09,998 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02.i [2020-10-23 18:43:10,093 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3760e18e9/6ccd5d0145d94ed2b0f4ab6051dc783e/FLAG0523bbfe5 [2020-10-23 18:43:10,792 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 18:43:10,793 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02.i [2020-10-23 18:43:10,801 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3760e18e9/6ccd5d0145d94ed2b0f4ab6051dc783e/FLAG0523bbfe5 [2020-10-23 18:43:11,173 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3760e18e9/6ccd5d0145d94ed2b0f4ab6051dc783e [2020-10-23 18:43:11,177 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 18:43:11,186 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 18:43:11,189 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 18:43:11,190 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 18:43:11,194 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 18:43:11,195 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:43:11" (1/1) ... [2020-10-23 18:43:11,200 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35a71c63 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:11, skipping insertion in model container [2020-10-23 18:43:11,200 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:43:11" (1/1) ... [2020-10-23 18:43:11,208 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 18:43:11,231 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 18:43:11,402 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:43:11,412 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 18:43:11,428 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:43:11,444 INFO L208 MainTranslator]: Completed translation [2020-10-23 18:43:11,445 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:11 WrapperNode [2020-10-23 18:43:11,445 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 18:43:11,446 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 18:43:11,447 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 18:43:11,447 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 18:43:11,460 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:11" (1/1) ... [2020-10-23 18:43:11,460 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:11" (1/1) ... [2020-10-23 18:43:11,468 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:11" (1/1) ... [2020-10-23 18:43:11,468 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:11" (1/1) ... [2020-10-23 18:43:11,474 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:11" (1/1) ... [2020-10-23 18:43:11,479 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:11" (1/1) ... [2020-10-23 18:43:11,481 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:11" (1/1) ... [2020-10-23 18:43:11,483 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 18:43:11,484 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 18:43:11,484 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 18:43:11,484 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 18:43:11,485 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:11" (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 [2020-10-23 18:43:11,560 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 18:43:11,560 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 18:43:11,561 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 18:43:11,561 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-23 18:43:11,561 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 18:43:11,561 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 18:43:11,561 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 18:43:11,562 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2020-10-23 18:43:11,562 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2020-10-23 18:43:11,562 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 18:43:11,562 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 18:43:11,562 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-23 18:43:11,562 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-10-23 18:43:11,563 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 18:43:11,563 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 18:43:11,563 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 18:43:11,563 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 18:43:11,563 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 18:43:11,563 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 18:43:11,564 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 18:43:11,814 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 18:43:11,815 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-23 18:43:11,817 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:43:11 BoogieIcfgContainer [2020-10-23 18:43:11,817 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 18:43:11,840 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 18:43:11,841 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 18:43:11,845 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 18:43:11,845 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 06:43:11" (1/3) ... [2020-10-23 18:43:11,849 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54b5af33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:43:11, skipping insertion in model container [2020-10-23 18:43:11,849 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:43:11" (2/3) ... [2020-10-23 18:43:11,850 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54b5af33 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:43:11, skipping insertion in model container [2020-10-23 18:43:11,850 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:43:11" (3/3) ... [2020-10-23 18:43:11,851 INFO L111 eAbstractionObserver]: Analyzing ICFG sum01_bug02.i [2020-10-23 18:43:11,864 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-23 18:43:11,869 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 18:43:11,885 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 18:43:11,929 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 18:43:11,929 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 18:43:11,930 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-23 18:43:11,930 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 18:43:11,930 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 18:43:11,930 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 18:43:11,930 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 18:43:11,930 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 18:43:11,950 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-10-23 18:43:11,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-10-23 18:43:11,956 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:11,957 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:11,958 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:11,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:11,966 INFO L82 PathProgramCache]: Analyzing trace with hash 734717802, now seen corresponding path program 1 times [2020-10-23 18:43:11,978 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:11,978 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1743989340] [2020-10-23 18:43:11,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:12,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:12,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:12,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:12,337 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:12,338 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1743989340] [2020-10-23 18:43:12,339 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:43:12,339 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-23 18:43:12,340 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423040636] [2020-10-23 18:43:12,345 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-23 18:43:12,345 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:12,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-23 18:43:12,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 18:43:12,363 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 3 states. [2020-10-23 18:43:12,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:12,444 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2020-10-23 18:43:12,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-23 18:43:12,446 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-10-23 18:43:12,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:12,454 INFO L225 Difference]: With dead ends: 39 [2020-10-23 18:43:12,454 INFO L226 Difference]: Without dead ends: 17 [2020-10-23 18:43:12,457 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-23 18:43:12,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-10-23 18:43:12,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-10-23 18:43:12,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-10-23 18:43:12,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-10-23 18:43:12,503 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-10-23 18:43:12,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:12,504 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-10-23 18:43:12,504 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-23 18:43:12,504 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-10-23 18:43:12,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-10-23 18:43:12,505 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:12,505 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:12,506 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 18:43:12,506 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:12,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:12,507 INFO L82 PathProgramCache]: Analyzing trace with hash 2082071837, now seen corresponding path program 1 times [2020-10-23 18:43:12,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:12,508 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247445916] [2020-10-23 18:43:12,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:12,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:12,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:12,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:12,642 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:12,643 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [247445916] [2020-10-23 18:43:12,643 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:43:12,643 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 18:43:12,644 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516093280] [2020-10-23 18:43:12,645 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 18:43:12,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:12,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 18:43:12,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 18:43:12,647 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 6 states. [2020-10-23 18:43:12,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:12,822 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2020-10-23 18:43:12,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:43:12,823 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-10-23 18:43:12,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:12,824 INFO L225 Difference]: With dead ends: 28 [2020-10-23 18:43:12,825 INFO L226 Difference]: Without dead ends: 21 [2020-10-23 18:43:12,826 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:43:12,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-10-23 18:43:12,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-10-23 18:43:12,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-10-23 18:43:12,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-10-23 18:43:12,836 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 13 [2020-10-23 18:43:12,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:12,836 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-10-23 18:43:12,836 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 18:43:12,837 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-10-23 18:43:12,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-23 18:43:12,837 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:12,838 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:12,838 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 18:43:12,838 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:12,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:12,839 INFO L82 PathProgramCache]: Analyzing trace with hash -569959400, now seen corresponding path program 1 times [2020-10-23 18:43:12,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:12,840 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465507073] [2020-10-23 18:43:12,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:12,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:13,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:13,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:13,095 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:13,095 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465507073] [2020-10-23 18:43:13,096 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [317857267] [2020-10-23 18:43:13,096 INFO L95 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 [2020-10-23 18:43:13,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:13,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 12 conjunts are in the unsatisfiable core [2020-10-23 18:43:13,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:43:13,332 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-10-23 18:43:13,389 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:13,390 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:43:13,390 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 15 [2020-10-23 18:43:13,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129896340] [2020-10-23 18:43:13,391 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-23 18:43:13,391 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:13,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-23 18:43:13,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-10-23 18:43:13,393 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 15 states. [2020-10-23 18:43:13,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:13,752 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2020-10-23 18:43:13,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-23 18:43:13,752 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 17 [2020-10-23 18:43:13,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:13,755 INFO L225 Difference]: With dead ends: 38 [2020-10-23 18:43:13,755 INFO L226 Difference]: Without dead ends: 31 [2020-10-23 18:43:13,757 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2020-10-23 18:43:13,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-10-23 18:43:13,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2020-10-23 18:43:13,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-23 18:43:13,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2020-10-23 18:43:13,766 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 17 [2020-10-23 18:43:13,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:13,766 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2020-10-23 18:43:13,766 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-23 18:43:13,766 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2020-10-23 18:43:13,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-23 18:43:13,767 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:13,767 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:13,982 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-10-23 18:43:13,983 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:13,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:13,984 INFO L82 PathProgramCache]: Analyzing trace with hash -2009440877, now seen corresponding path program 2 times [2020-10-23 18:43:13,985 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:13,986 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36745061] [2020-10-23 18:43:13,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:14,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:14,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:14,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:14,316 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:14,317 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36745061] [2020-10-23 18:43:14,317 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [12389856] [2020-10-23 18:43:14,317 INFO L93 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 [2020-10-23 18:43:14,368 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-23 18:43:14,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:43:14,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-23 18:43:14,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:43:14,542 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-10-23 18:43:14,547 INFO L375 QuantifierPusher]: Applying distributivity to a CONJUNCTION[3, 2, 1] term [2020-10-23 18:43:14,548 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-10-23 18:43:14,551 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-10-23 18:43:14,603 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:14,604 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:43:14,604 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 19 [2020-10-23 18:43:14,604 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34306557] [2020-10-23 18:43:14,605 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-10-23 18:43:14,605 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:14,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-10-23 18:43:14,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=288, Unknown=0, NotChecked=0, Total=342 [2020-10-23 18:43:14,607 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 19 states. [2020-10-23 18:43:15,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:15,682 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2020-10-23 18:43:15,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-10-23 18:43:15,686 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 21 [2020-10-23 18:43:15,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:15,687 INFO L225 Difference]: With dead ends: 51 [2020-10-23 18:43:15,687 INFO L226 Difference]: Without dead ends: 43 [2020-10-23 18:43:15,690 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=162, Invalid=894, Unknown=0, NotChecked=0, Total=1056 [2020-10-23 18:43:15,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-10-23 18:43:15,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 34. [2020-10-23 18:43:15,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-10-23 18:43:15,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-10-23 18:43:15,706 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 21 [2020-10-23 18:43:15,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:15,706 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-10-23 18:43:15,706 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-10-23 18:43:15,707 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-10-23 18:43:15,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-23 18:43:15,708 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:15,708 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:15,909 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:43:15,910 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:15,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:15,912 INFO L82 PathProgramCache]: Analyzing trace with hash 1892499409, now seen corresponding path program 1 times [2020-10-23 18:43:15,912 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:15,913 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1587103668] [2020-10-23 18:43:15,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:15,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:16,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:16,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:16,045 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:16,045 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1587103668] [2020-10-23 18:43:16,045 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101602198] [2020-10-23 18:43:16,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-10-23 18:43:16,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:16,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 5 conjunts are in the unsatisfiable core [2020-10-23 18:43:16,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:43:16,161 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:16,161 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:43:16,161 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2020-10-23 18:43:16,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749902176] [2020-10-23 18:43:16,162 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-23 18:43:16,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:16,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-23 18:43:16,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=43, Unknown=0, NotChecked=0, Total=72 [2020-10-23 18:43:16,163 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 9 states. [2020-10-23 18:43:16,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:16,364 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2020-10-23 18:43:16,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:43:16,364 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 21 [2020-10-23 18:43:16,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:16,365 INFO L225 Difference]: With dead ends: 45 [2020-10-23 18:43:16,366 INFO L226 Difference]: Without dead ends: 30 [2020-10-23 18:43:16,366 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=79, Unknown=0, NotChecked=0, Total=132 [2020-10-23 18:43:16,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-10-23 18:43:16,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-10-23 18:43:16,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-23 18:43:16,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-10-23 18:43:16,374 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 21 [2020-10-23 18:43:16,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:16,374 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-10-23 18:43:16,374 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-23 18:43:16,374 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-10-23 18:43:16,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-23 18:43:16,375 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:16,376 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:16,589 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:43:16,590 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:16,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:16,592 INFO L82 PathProgramCache]: Analyzing trace with hash 1681738700, now seen corresponding path program 2 times [2020-10-23 18:43:16,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:16,593 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786908522] [2020-10-23 18:43:16,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:16,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:16,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:16,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:16,737 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:16,741 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786908522] [2020-10-23 18:43:16,741 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236318847] [2020-10-23 18:43:16,742 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2020-10-23 18:43:16,803 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-23 18:43:16,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:43:16,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 7 conjunts are in the unsatisfiable core [2020-10-23 18:43:16,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:43:16,928 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 7 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:16,928 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:43:16,928 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2020-10-23 18:43:16,929 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844309699] [2020-10-23 18:43:16,929 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-23 18:43:16,929 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:16,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-23 18:43:16,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=92, Unknown=0, NotChecked=0, Total=156 [2020-10-23 18:43:16,930 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 13 states. [2020-10-23 18:43:17,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:17,186 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2020-10-23 18:43:17,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-23 18:43:17,187 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-10-23 18:43:17,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:17,188 INFO L225 Difference]: With dead ends: 41 [2020-10-23 18:43:17,188 INFO L226 Difference]: Without dead ends: 30 [2020-10-23 18:43:17,189 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=187, Unknown=0, NotChecked=0, Total=306 [2020-10-23 18:43:17,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-10-23 18:43:17,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-10-23 18:43:17,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-23 18:43:17,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-10-23 18:43:17,196 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 25 [2020-10-23 18:43:17,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:17,196 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-10-23 18:43:17,196 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-23 18:43:17,196 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-10-23 18:43:17,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-23 18:43:17,197 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:17,197 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:17,398 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:43:17,398 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:17,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:17,400 INFO L82 PathProgramCache]: Analyzing trace with hash -538050551, now seen corresponding path program 3 times [2020-10-23 18:43:17,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:17,401 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978401937] [2020-10-23 18:43:17,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:17,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:17,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:17,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:17,741 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-10-23 18:43:17,741 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978401937] [2020-10-23 18:43:17,741 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [481642362] [2020-10-23 18:43:17,741 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2020-10-23 18:43:17,814 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-10-23 18:43:17,814 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:43:17,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 24 conjunts are in the unsatisfiable core [2020-10-23 18:43:17,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:43:18,118 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-10-23 18:43:18,127 INFO L375 QuantifierPusher]: Applying distributivity to a CONJUNCTION[3, 2, 1] term [2020-10-23 18:43:18,127 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-10-23 18:43:18,132 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-10-23 18:43:18,187 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:18,187 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:43:18,187 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 24 [2020-10-23 18:43:18,188 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131443697] [2020-10-23 18:43:18,188 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-10-23 18:43:18,188 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:18,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-10-23 18:43:18,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=482, Unknown=0, NotChecked=0, Total=552 [2020-10-23 18:43:18,190 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 24 states. [2020-10-23 18:43:19,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:19,923 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2020-10-23 18:43:19,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-10-23 18:43:19,923 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 29 [2020-10-23 18:43:19,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:19,925 INFO L225 Difference]: With dead ends: 53 [2020-10-23 18:43:19,926 INFO L226 Difference]: Without dead ends: 45 [2020-10-23 18:43:19,928 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 488 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=238, Invalid=1742, Unknown=0, NotChecked=0, Total=1980 [2020-10-23 18:43:19,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-10-23 18:43:19,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 31. [2020-10-23 18:43:19,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-10-23 18:43:19,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 33 transitions. [2020-10-23 18:43:19,936 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 33 transitions. Word has length 29 [2020-10-23 18:43:19,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:19,936 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 33 transitions. [2020-10-23 18:43:19,936 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-10-23 18:43:19,936 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 33 transitions. [2020-10-23 18:43:19,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-10-23 18:43:19,937 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:19,937 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:20,151 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-10-23 18:43:20,152 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:20,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:20,153 INFO L82 PathProgramCache]: Analyzing trace with hash -931077561, now seen corresponding path program 3 times [2020-10-23 18:43:20,154 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:20,154 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411581394] [2020-10-23 18:43:20,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:20,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:20,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:20,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:20,290 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:20,290 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411581394] [2020-10-23 18:43:20,290 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1429161702] [2020-10-23 18:43:20,291 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2020-10-23 18:43:20,352 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-10-23 18:43:20,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:43:20,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 9 conjunts are in the unsatisfiable core [2020-10-23 18:43:20,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:43:20,492 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:20,493 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:43:20,493 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 17 [2020-10-23 18:43:20,493 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097497922] [2020-10-23 18:43:20,494 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-10-23 18:43:20,494 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:20,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-10-23 18:43:20,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=161, Unknown=0, NotChecked=0, Total=272 [2020-10-23 18:43:20,495 INFO L87 Difference]: Start difference. First operand 31 states and 33 transitions. Second operand 17 states. [2020-10-23 18:43:20,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:20,862 INFO L93 Difference]: Finished difference Result 47 states and 51 transitions. [2020-10-23 18:43:20,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-23 18:43:20,863 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2020-10-23 18:43:20,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:20,863 INFO L225 Difference]: With dead ends: 47 [2020-10-23 18:43:20,864 INFO L226 Difference]: Without dead ends: 36 [2020-10-23 18:43:20,864 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=209, Invalid=343, Unknown=0, NotChecked=0, Total=552 [2020-10-23 18:43:20,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-10-23 18:43:20,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-10-23 18:43:20,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-10-23 18:43:20,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2020-10-23 18:43:20,881 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 29 [2020-10-23 18:43:20,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:20,881 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2020-10-23 18:43:20,881 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-10-23 18:43:20,881 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2020-10-23 18:43:20,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-23 18:43:20,882 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:20,882 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:21,097 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:43:21,097 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:21,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:21,098 INFO L82 PathProgramCache]: Analyzing trace with hash -1680948414, now seen corresponding path program 4 times [2020-10-23 18:43:21,098 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:21,099 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956853329] [2020-10-23 18:43:21,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:21,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:21,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:43:21,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:43:21,284 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:21,284 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956853329] [2020-10-23 18:43:21,284 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1013752451] [2020-10-23 18:43:21,284 INFO L93 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:43:21,338 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-10-23 18:43:21,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:43:21,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 11 conjunts are in the unsatisfiable core [2020-10-23 18:43:21,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:43:21,564 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 13 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:43:21,565 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:43:21,565 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2020-10-23 18:43:21,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852432955] [2020-10-23 18:43:21,566 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-10-23 18:43:21,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:43:21,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-10-23 18:43:21,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=250, Unknown=0, NotChecked=0, Total=420 [2020-10-23 18:43:21,567 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 21 states. [2020-10-23 18:43:22,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:43:22,132 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2020-10-23 18:43:22,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-23 18:43:22,133 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 33 [2020-10-23 18:43:22,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:43:22,134 INFO L225 Difference]: With dead ends: 52 [2020-10-23 18:43:22,134 INFO L226 Difference]: Without dead ends: 41 [2020-10-23 18:43:22,135 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 215 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=336, Invalid=594, Unknown=0, NotChecked=0, Total=930 [2020-10-23 18:43:22,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-10-23 18:43:22,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2020-10-23 18:43:22,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-10-23 18:43:22,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2020-10-23 18:43:22,149 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 33 [2020-10-23 18:43:22,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:43:22,149 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2020-10-23 18:43:22,149 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-10-23 18:43:22,150 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2020-10-23 18:43:22,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-10-23 18:43:22,151 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:43:22,151 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:43:22,366 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:43:22,367 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:43:22,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:43:22,368 INFO L82 PathProgramCache]: Analyzing trace with hash 1660792509, now seen corresponding path program 5 times [2020-10-23 18:43:22,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:43:22,369 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370119893] [2020-10-23 18:43:22,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:43:22,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:43:22,389 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:43:22,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:43:22,409 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:43:22,447 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-23 18:43:22,447 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 18:43:22,447 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-10-23 18:43:22,499 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 06:43:22 BoogieIcfgContainer [2020-10-23 18:43:22,500 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 18:43:22,502 INFO L168 Benchmark]: Toolchain (without parser) took 11321.94 ms. Allocated memory was 151.0 MB in the beginning and 244.3 MB in the end (delta: 93.3 MB). Free memory was 126.6 MB in the beginning and 131.3 MB in the end (delta: -4.7 MB). Peak memory consumption was 89.7 MB. Max. memory is 8.0 GB. [2020-10-23 18:43:22,502 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 151.0 MB. Free memory is still 123.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 18:43:22,503 INFO L168 Benchmark]: CACSL2BoogieTranslator took 256.56 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 116.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-23 18:43:22,504 INFO L168 Benchmark]: Boogie Preprocessor took 36.40 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 115.3 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-23 18:43:22,504 INFO L168 Benchmark]: RCFGBuilder took 333.14 ms. Allocated memory is still 151.0 MB. Free memory was 115.3 MB in the beginning and 102.3 MB in the end (delta: 13.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-10-23 18:43:22,505 INFO L168 Benchmark]: TraceAbstraction took 10659.12 ms. Allocated memory was 151.0 MB in the beginning and 244.3 MB in the end (delta: 93.3 MB). Free memory was 134.6 MB in the beginning and 131.3 MB in the end (delta: 3.3 MB). Peak memory consumption was 96.6 MB. Max. memory is 8.0 GB. [2020-10-23 18:43:22,509 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 151.0 MB. Free memory is still 123.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 256.56 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 116.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 36.40 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 115.3 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 333.14 ms. Allocated memory is still 151.0 MB. Free memory was 115.3 MB in the beginning and 102.3 MB in the end (delta: 13.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 10659.12 ms. Allocated memory was 151.0 MB in the beginning and 244.3 MB in the end (delta: 93.3 MB). Free memory was 134.6 MB in the beginning and 131.3 MB in the end (delta: 3.3 MB). Peak memory consumption was 96.6 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 12]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L23] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L23] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L24] i=1 VAL [i=1, j=10, n=0, n=6] [L24] COND TRUE i<=n VAL [i=1, j=10, n=0, n=6] [L25] COND TRUE i