/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 11:49:51,235 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 11:49:51,237 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 11:49:51,266 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 11:49:51,281 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 11:49:51,283 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 11:49:51,284 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 11:49:51,285 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 11:49:51,287 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 11:49:51,287 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 11:49:51,289 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 11:49:51,293 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 11:49:51,294 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 11:49:51,295 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 11:49:51,295 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 11:49:51,297 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 11:49:51,301 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 11:49:51,309 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 11:49:51,309 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 11:49:51,310 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 11:49:51,311 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 [2021-05-02 11:49:51,352 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 11:49:51,352 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 11:49:51,354 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 11:49:51,354 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 11:49:51,355 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 11:49:51,355 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 11:49:51,355 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 11:49:51,355 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 11:49:51,355 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 11:49:51,355 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 11:49:51,356 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 11:49:51,356 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 11:49:51,356 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 11:49:51,356 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 11:49:51,356 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 11:49:51,356 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 11:49:51,356 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 11:49:51,356 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 11:49:51,356 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 11:49:51,357 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 11:49:51,357 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:49:51,357 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 11:49:51,357 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 11:49:51,357 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 11:49:51,357 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 11:49:51,357 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 11:49:51,357 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 11:49:51,357 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 11:49:51,358 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 11:49:51,617 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 11:49:51,639 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 11:49:51,641 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 11:49:51,642 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 11:49:51,643 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 11:49:51,643 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2021-05-02 11:49:51,689 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/caf473690/f7ebaea7376a45c69830b2f883e050f4/FLAGe6588206c [2021-05-02 11:49:52,066 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 11:49:52,066 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c [2021-05-02 11:49:52,070 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/caf473690/f7ebaea7376a45c69830b2f883e050f4/FLAGe6588206c [2021-05-02 11:49:52,088 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/caf473690/f7ebaea7376a45c69830b2f883e050f4 [2021-05-02 11:49:52,090 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 11:49:52,091 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 11:49:52,093 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 11:49:52,093 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 11:49:52,096 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 11:49:52,097 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:49:52" (1/1) ... [2021-05-02 11:49:52,097 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3241dd6f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:52, skipping insertion in model container [2021-05-02 11:49:52,097 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:49:52" (1/1) ... [2021-05-02 11:49:52,102 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 11:49:52,111 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 11:49:52,214 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c[352,365] [2021-05-02 11:49:52,231 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:49:52,235 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 11:49:52,253 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/invert_string-1.c[352,365] [2021-05-02 11:49:52,274 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:49:52,285 INFO L208 MainTranslator]: Completed translation [2021-05-02 11:49:52,286 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:52 WrapperNode [2021-05-02 11:49:52,286 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 11:49:52,287 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 11:49:52,287 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 11:49:52,288 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 11:49:52,295 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:52" (1/1) ... [2021-05-02 11:49:52,296 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:52" (1/1) ... [2021-05-02 11:49:52,300 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:52" (1/1) ... [2021-05-02 11:49:52,301 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:52" (1/1) ... [2021-05-02 11:49:52,312 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:52" (1/1) ... [2021-05-02 11:49:52,315 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:52" (1/1) ... [2021-05-02 11:49:52,320 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:52" (1/1) ... [2021-05-02 11:49:52,322 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 11:49:52,323 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 11:49:52,324 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 11:49:52,324 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 11:49:52,324 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:52" (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 [2021-05-02 11:49:52,417 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 11:49:52,418 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 11:49:52,418 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 11:49:52,418 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 11:49:52,418 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 11:49:52,418 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 11:49:52,418 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 11:49:52,419 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 11:49:52,419 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 11:49:52,419 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 11:49:52,419 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-05-02 11:49:52,419 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-02 11:49:52,420 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 11:49:52,420 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 11:49:52,420 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 11:49:52,420 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 11:49:52,420 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 11:49:52,420 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 11:49:52,421 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 11:49:52,680 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 11:49:52,681 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-02 11:49:52,682 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:49:52 BoogieIcfgContainer [2021-05-02 11:49:52,682 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 11:49:52,683 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 11:49:52,683 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 11:49:52,684 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 11:49:52,685 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:49:52" (1/3) ... [2021-05-02 11:49:52,685 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78613d45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:49:52, skipping insertion in model container [2021-05-02 11:49:52,685 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:49:52" (2/3) ... [2021-05-02 11:49:52,685 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78613d45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:49:52, skipping insertion in model container [2021-05-02 11:49:52,686 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:49:52" (3/3) ... [2021-05-02 11:49:52,686 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2021-05-02 11:49:52,704 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 11:49:52,707 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 11:49:52,735 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 11:49:52,765 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 11:49:52,766 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 11:49:52,766 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 11:49:52,766 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 11:49:52,766 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 11:49:52,766 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 11:49:52,766 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 11:49:52,766 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 11:49:52,786 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 22 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 11:49:52,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 11:49:52,789 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:52,790 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:52,790 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:52,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:52,793 INFO L82 PathProgramCache]: Analyzing trace with hash -1739069180, now seen corresponding path program 1 times [2021-05-02 11:49:52,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:52,813 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716425836] [2021-05-02 11:49:52,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:52,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:53,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,040 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:53,040 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:53,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716425836] [2021-05-02 11:49:53,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1716425836] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:53,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:53,042 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 11:49:53,043 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410208310] [2021-05-02 11:49:53,048 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 11:49:53,048 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:53,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 11:49:53,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:49:53,061 INFO L87 Difference]: Start difference. First operand has 29 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 22 states have internal predecessors, (30), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:53,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:53,137 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2021-05-02 11:49:53,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 11:49:53,139 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 11:49:53,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:53,145 INFO L225 Difference]: With dead ends: 51 [2021-05-02 11:49:53,145 INFO L226 Difference]: Without dead ends: 24 [2021-05-02 11:49:53,150 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 45.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:49:53,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-05-02 11:49:53,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-05-02 11:49:53,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:53,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-05-02 11:49:53,180 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2021-05-02 11:49:53,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:53,180 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-05-02 11:49:53,180 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:53,180 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-05-02 11:49:53,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 11:49:53,181 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:53,182 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:53,182 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 11:49:53,182 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:53,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:53,183 INFO L82 PathProgramCache]: Analyzing trace with hash 186732794, now seen corresponding path program 1 times [2021-05-02 11:49:53,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:53,183 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256381002] [2021-05-02 11:49:53,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:53,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:53,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,314 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:53,314 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:53,314 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256381002] [2021-05-02 11:49:53,314 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256381002] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:53,314 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:53,315 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 11:49:53,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402990240] [2021-05-02 11:49:53,316 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 11:49:53,316 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:53,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 11:49:53,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:49:53,317 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:53,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:53,437 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-05-02 11:49:53,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 11:49:53,438 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-02 11:49:53,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:53,440 INFO L225 Difference]: With dead ends: 44 [2021-05-02 11:49:53,440 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 11:49:53,442 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 89.9ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 11:49:53,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 11:49:53,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2021-05-02 11:49:53,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:53,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2021-05-02 11:49:53,456 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2021-05-02 11:49:53,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:53,457 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2021-05-02 11:49:53,457 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:53,457 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2021-05-02 11:49:53,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 11:49:53,458 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:53,458 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:53,459 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 11:49:53,459 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:53,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:53,459 INFO L82 PathProgramCache]: Analyzing trace with hash -848440424, now seen corresponding path program 1 times [2021-05-02 11:49:53,460 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:53,460 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897694279] [2021-05-02 11:49:53,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:53,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:53,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,572 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 11:49:53,572 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:53,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897694279] [2021-05-02 11:49:53,574 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897694279] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:49:53,574 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:49:53,574 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 11:49:53,574 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403310079] [2021-05-02 11:49:53,575 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 11:49:53,575 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:53,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 11:49:53,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:49:53,576 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:53,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:53,673 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2021-05-02 11:49:53,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 11:49:53,673 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-02 11:49:53,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:53,675 INFO L225 Difference]: With dead ends: 37 [2021-05-02 11:49:53,675 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 11:49:53,677 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 67.3ms TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:49:53,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 11:49:53,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-02 11:49:53,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:53,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2021-05-02 11:49:53,683 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2021-05-02 11:49:53,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:53,683 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2021-05-02 11:49:53,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:53,683 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2021-05-02 11:49:53,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 11:49:53,684 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:53,684 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:53,684 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 11:49:53,684 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:53,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:53,685 INFO L82 PathProgramCache]: Analyzing trace with hash 689124982, now seen corresponding path program 1 times [2021-05-02 11:49:53,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:53,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028304240] [2021-05-02 11:49:53,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:53,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:53,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:53,969 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:53,969 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:53,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1028304240] [2021-05-02 11:49:53,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1028304240] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:53,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878672714] [2021-05-02 11:49:53,970 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 [2021-05-02 11:49:54,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:54,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 11:49:54,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:54,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-05-02 11:49:54,191 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:49:54,199 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 11:49:54,200 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:49:54,201 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:26 [2021-05-02 11:49:54,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,267 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-02 11:49:54,279 INFO L354 Elim1Store]: treesize reduction 45, result has 19.6 percent of original size [2021-05-02 11:49:54,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 21 [2021-05-02 11:49:54,282 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:49:54,305 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 11:49:54,309 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:49:54,309 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:38, output treesize:31 [2021-05-02 11:49:54,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,395 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:54,403 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-02 11:49:54,408 INFO L354 Elim1Store]: treesize reduction 17, result has 15.0 percent of original size [2021-05-02 11:49:54,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 16 [2021-05-02 11:49:54,410 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:49:54,415 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 11:49:54,418 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:49:54,418 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:39, output treesize:7 [2021-05-02 11:49:54,468 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:54,469 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878672714] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:54,469 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:54,469 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 22 [2021-05-02 11:49:54,469 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63352165] [2021-05-02 11:49:54,469 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-02 11:49:54,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:54,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-02 11:49:54,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2021-05-02 11:49:54,470 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 22 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:54,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:54,929 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2021-05-02 11:49:54,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 11:49:54,930 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 21 [2021-05-02 11:49:54,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:54,930 INFO L225 Difference]: With dead ends: 54 [2021-05-02 11:49:54,931 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 11:49:54,931 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 610.2ms TimeCoverageRelationStatistics Valid=176, Invalid=946, Unknown=0, NotChecked=0, Total=1122 [2021-05-02 11:49:54,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 11:49:54,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-05-02 11:49:54,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:54,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-02 11:49:54,934 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2021-05-02 11:49:54,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:54,934 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-02 11:49:54,934 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:54,935 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-02 11:49:54,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 11:49:54,935 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:54,935 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:55,151 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:55,154 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:55,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:55,155 INFO L82 PathProgramCache]: Analyzing trace with hash 369179156, now seen corresponding path program 2 times [2021-05-02 11:49:55,155 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:55,155 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406620410] [2021-05-02 11:49:55,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:55,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:55,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:55,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:55,276 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:55,276 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:55,276 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406620410] [2021-05-02 11:49:55,276 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406620410] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:55,276 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323340693] [2021-05-02 11:49:55,277 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 [2021-05-02 11:49:55,317 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:49:55,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:55,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 11:49:55,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:55,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:55,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:55,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:55,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:55,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:55,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:55,362 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:55,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323340693] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:55,362 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:55,362 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 7 [2021-05-02 11:49:55,362 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133986931] [2021-05-02 11:49:55,363 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 11:49:55,363 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:55,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 11:49:55,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:49:55,363 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:55,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:55,446 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2021-05-02 11:49:55,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 11:49:55,447 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-02 11:49:55,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:55,448 INFO L225 Difference]: With dead ends: 45 [2021-05-02 11:49:55,448 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 11:49:55,448 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 43.6ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-02 11:49:55,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 11:49:55,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2021-05-02 11:49:55,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 11:49:55,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-05-02 11:49:55,451 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2021-05-02 11:49:55,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:55,452 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-05-02 11:49:55,452 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 6 states have internal predecessors, (23), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:55,452 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-05-02 11:49:55,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 11:49:55,452 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:55,452 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:55,668 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:55,668 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:55,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:55,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1704530446, now seen corresponding path program 3 times [2021-05-02 11:49:55,670 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:55,670 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353435626] [2021-05-02 11:49:55,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:55,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:55,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:55,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:55,992 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:55,993 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:55,993 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353435626] [2021-05-02 11:49:55,993 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1353435626] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:55,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [630740706] [2021-05-02 11:49:55,995 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 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 [2021-05-02 11:49:56,069 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 11:49:56,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:56,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 11:49:56,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:56,084 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-02 11:49:56,092 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:49:56,096 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 11:49:56,097 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:49:56,097 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2021-05-02 11:49:56,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2021-05-02 11:49:56,257 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:49:56,263 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 11:49:56,264 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:49:56,264 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:31, output treesize:27 [2021-05-02 11:49:56,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:56,356 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-05-02 11:49:56,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 13 [2021-05-02 11:49:56,358 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:49:56,363 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 11:49:56,365 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:49:56,365 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:40, output treesize:3 [2021-05-02 11:49:56,394 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:56,394 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [630740706] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:56,395 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:56,395 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 26 [2021-05-02 11:49:56,395 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995473620] [2021-05-02 11:49:56,395 INFO L460 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-05-02 11:49:56,395 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:56,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-05-02 11:49:56,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=575, Unknown=0, NotChecked=0, Total=650 [2021-05-02 11:49:56,396 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 26 states, 25 states have (on average 1.52) internal successors, (38), 23 states have internal predecessors, (38), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:57,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:57,053 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2021-05-02 11:49:57,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-02 11:49:57,054 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 1.52) internal successors, (38), 23 states have internal predecessors, (38), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2021-05-02 11:49:57,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:57,054 INFO L225 Difference]: With dead ends: 59 [2021-05-02 11:49:57,054 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 11:49:57,055 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 337 ImplicationChecksByTransitivity, 809.0ms TimeCoverageRelationStatistics Valid=276, Invalid=1446, Unknown=0, NotChecked=0, Total=1722 [2021-05-02 11:49:57,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 11:49:57,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2021-05-02 11:49:57,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 37 states have (on average 1.135135135135135) internal successors, (42), 38 states have internal predecessors, (42), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 11:49:57,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2021-05-02 11:49:57,060 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 25 [2021-05-02 11:49:57,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:57,060 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2021-05-02 11:49:57,060 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 26 states, 25 states have (on average 1.52) internal successors, (38), 23 states have internal predecessors, (38), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:57,061 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2021-05-02 11:49:57,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 11:49:57,061 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:57,061 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:57,277 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:57,278 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:57,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:57,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1823608176, now seen corresponding path program 4 times [2021-05-02 11:49:57,278 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:57,278 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372729861] [2021-05-02 11:49:57,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:57,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:57,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:57,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:57,332 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:57,332 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:57,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372729861] [2021-05-02 11:49:57,332 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372729861] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:57,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542034150] [2021-05-02 11:49:57,332 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 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 [2021-05-02 11:49:57,365 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 11:49:57,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:57,366 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 31 conjunts are in the unsatisfiable core [2021-05-02 11:49:57,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:57,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,383 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-02 11:49:57,384 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:49:57,387 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 11:49:57,388 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:49:57,388 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2021-05-02 11:49:57,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2021-05-02 11:49:57,461 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:49:57,468 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 11:49:57,469 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:49:57,469 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:36, output treesize:32 [2021-05-02 11:49:57,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,575 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,579 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:57,589 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-02 11:49:57,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2021-05-02 11:49:57,591 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:49:57,596 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 11:49:57,598 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:49:57,598 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:36, output treesize:3 [2021-05-02 11:49:57,632 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 11:49:57,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542034150] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:57,633 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:57,633 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13] total 19 [2021-05-02 11:49:57,633 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116519935] [2021-05-02 11:49:57,633 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 11:49:57,633 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:57,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 11:49:57,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2021-05-02 11:49:57,634 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:58,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:49:58,478 INFO L93 Difference]: Finished difference Result 91 states and 101 transitions. [2021-05-02 11:49:58,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-02 11:49:58,479 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 27 [2021-05-02 11:49:58,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:49:58,479 INFO L225 Difference]: With dead ends: 91 [2021-05-02 11:49:58,479 INFO L226 Difference]: Without dead ends: 77 [2021-05-02 11:49:58,480 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 642.9ms TimeCoverageRelationStatistics Valid=286, Invalid=1520, Unknown=0, NotChecked=0, Total=1806 [2021-05-02 11:49:58,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-05-02 11:49:58,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 60. [2021-05-02 11:49:58,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 49 states have (on average 1.1224489795918366) internal successors, (55), 51 states have internal predecessors, (55), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 11:49:58,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2021-05-02 11:49:58,487 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 27 [2021-05-02 11:49:58,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:49:58,487 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2021-05-02 11:49:58,487 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 2.111111111111111) internal successors, (38), 17 states have internal predecessors, (38), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:49:58,487 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2021-05-02 11:49:58,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 11:49:58,488 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:49:58,488 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:49:58,703 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:49:58,704 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:49:58,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:49:58,704 INFO L82 PathProgramCache]: Analyzing trace with hash -144214162, now seen corresponding path program 5 times [2021-05-02 11:49:58,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:49:58,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349192602] [2021-05-02 11:49:58,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:49:58,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:58,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:49:58,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:49:58,951 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:58,951 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:49:58,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349192602] [2021-05-02 11:49:58,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349192602] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:58,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1322697419] [2021-05-02 11:49:58,952 INFO L93 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 [2021-05-02 11:49:58,997 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-02 11:49:58,997 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:49:58,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 11:49:58,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:49:59,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-02 11:49:59,014 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:49:59,018 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 11:49:59,018 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:49:59,019 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2021-05-02 11:49:59,120 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,206 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2021-05-02 11:49:59,219 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:49:59,226 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 11:49:59,226 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:49:59,226 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:31, output treesize:27 [2021-05-02 11:49:59,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,295 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,297 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:49:59,310 INFO L354 Elim1Store]: treesize reduction 9, result has 25.0 percent of original size [2021-05-02 11:49:59,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 13 [2021-05-02 11:49:59,311 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-02 11:49:59,316 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-02 11:49:59,323 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-05-02 11:49:59,323 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 5 variables, input treesize:40, output treesize:3 [2021-05-02 11:49:59,357 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:49:59,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1322697419] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:49:59,357 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:49:59,357 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 30 [2021-05-02 11:49:59,357 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271974732] [2021-05-02 11:49:59,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-05-02 11:49:59,358 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:49:59,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-05-02 11:49:59,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=782, Unknown=0, NotChecked=0, Total=870 [2021-05-02 11:49:59,359 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand has 30 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 27 states have internal predecessors, (46), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:00,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:50:00,374 INFO L93 Difference]: Finished difference Result 95 states and 105 transitions. [2021-05-02 11:50:00,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-02 11:50:00,375 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 27 states have internal predecessors, (46), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 29 [2021-05-02 11:50:00,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:50:00,377 INFO L225 Difference]: With dead ends: 95 [2021-05-02 11:50:00,377 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 11:50:00,378 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 1034.4ms TimeCoverageRelationStatistics Valid=346, Invalid=2104, Unknown=0, NotChecked=0, Total=2450 [2021-05-02 11:50:00,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 11:50:00,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 68. [2021-05-02 11:50:00,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 57 states have (on average 1.1228070175438596) internal successors, (64), 59 states have internal predecessors, (64), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 11:50:00,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2021-05-02 11:50:00,385 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 29 [2021-05-02 11:50:00,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:50:00,385 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2021-05-02 11:50:00,385 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 30 states, 29 states have (on average 1.5862068965517242) internal successors, (46), 27 states have internal predecessors, (46), 2 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:00,385 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2021-05-02 11:50:00,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 11:50:00,386 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:50:00,386 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:50:00,602 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:50:00,602 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:50:00,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:50:00,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1709112588, now seen corresponding path program 6 times [2021-05-02 11:50:00,603 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:50:00,603 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140717898] [2021-05-02 11:50:00,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:50:00,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:00,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:50:00,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:50:00,674 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:00,674 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:50:00,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140717898] [2021-05-02 11:50:00,674 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [140717898] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:00,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367689206] [2021-05-02 11:50:00,675 INFO L93 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 [2021-05-02 11:50:00,776 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 11:50:00,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:50:00,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 11:50:00,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:50:00,790 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,839 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,840 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:50:00,848 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:50:00,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367689206] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:50:00,848 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:50:00,848 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 9 [2021-05-02 11:50:00,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484983465] [2021-05-02 11:50:00,849 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 11:50:00,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:50:00,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 11:50:00,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:50:00,849 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:01,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:50:01,039 INFO L93 Difference]: Finished difference Result 104 states and 116 transitions. [2021-05-02 11:50:01,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 11:50:01,039 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2021-05-02 11:50:01,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:50:01,040 INFO L225 Difference]: With dead ends: 104 [2021-05-02 11:50:01,040 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 11:50:01,041 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 70.8ms TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2021-05-02 11:50:01,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 11:50:01,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 70. [2021-05-02 11:50:01,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 59 states have (on average 1.11864406779661) internal successors, (66), 61 states have internal predecessors, (66), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 11:50:01,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 76 transitions. [2021-05-02 11:50:01,048 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 76 transitions. Word has length 31 [2021-05-02 11:50:01,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:50:01,048 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 76 transitions. [2021-05-02 11:50:01,048 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.4444444444444446) internal successors, (31), 8 states have internal predecessors, (31), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 11:50:01,048 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 76 transitions. [2021-05-02 11:50:01,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 11:50:01,049 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:50:01,049 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:50:01,265 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:50:01,265 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:50:01,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:50:01,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1181909964, now seen corresponding path program 1 times [2021-05-02 11:50:01,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:50:01,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1946777419] [2021-05-02 11:50:01,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:50:01,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:50:01,280 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:50:01,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:50:01,293 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:50:01,307 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 11:50:01,307 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 11:50:01,307 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-02 11:50:01,332 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 11:50:01 BoogieIcfgContainer [2021-05-02 11:50:01,332 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 11:50:01,333 INFO L168 Benchmark]: Toolchain (without parser) took 9241.62 ms. Allocated memory was 187.7 MB in the beginning and 338.7 MB in the end (delta: 151.0 MB). Free memory was 152.2 MB in the beginning and 239.5 MB in the end (delta: -87.3 MB). Peak memory consumption was 64.4 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:01,333 INFO L168 Benchmark]: CDTParser took 0.10 ms. Allocated memory is still 187.7 MB. Free memory is still 168.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 11:50:01,333 INFO L168 Benchmark]: CACSL2BoogieTranslator took 192.83 ms. Allocated memory is still 187.7 MB. Free memory was 152.0 MB in the beginning and 170.9 MB in the end (delta: -18.9 MB). Peak memory consumption was 10.8 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:01,333 INFO L168 Benchmark]: Boogie Preprocessor took 35.48 ms. Allocated memory is still 187.7 MB. Free memory was 170.4 MB in the beginning and 169.3 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:01,333 INFO L168 Benchmark]: RCFGBuilder took 358.19 ms. Allocated memory is still 187.7 MB. Free memory was 168.8 MB in the beginning and 152.5 MB in the end (delta: 16.3 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:01,333 INFO L168 Benchmark]: TraceAbstraction took 8649.52 ms. Allocated memory was 187.7 MB in the beginning and 338.7 MB in the end (delta: 151.0 MB). Free memory was 152.0 MB in the beginning and 239.5 MB in the end (delta: -87.5 MB). Peak memory consumption was 65.1 MB. Max. memory is 8.0 GB. [2021-05-02 11:50:01,333 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.10 ms. Allocated memory is still 187.7 MB. Free memory is still 168.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 192.83 ms. Allocated memory is still 187.7 MB. Free memory was 152.0 MB in the beginning and 170.9 MB in the end (delta: -18.9 MB). Peak memory consumption was 10.8 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.48 ms. Allocated memory is still 187.7 MB. Free memory was 170.4 MB in the beginning and 169.3 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 358.19 ms. Allocated memory is still 187.7 MB. Free memory was 168.8 MB in the beginning and 152.5 MB in the end (delta: 16.3 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 8649.52 ms. Allocated memory was 187.7 MB in the beginning and 338.7 MB in the end (delta: 151.0 MB). Free memory was 152.0 MB in the beginning and 239.5 MB in the end (delta: -87.5 MB). Peak memory consumption was 65.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) VAL [MAX=2] [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 VAL [cont=0, i=0, MAX=2, str1={3:0}, str2={7:0}] [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ VAL [cont=0, i=1, j=1, MAX=2, str1={3:0}, str2={7:0}] [L29] i-- VAL [cont=0, i=0, j=1, MAX=2, str1={3:0}, str2={7:0}] [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ VAL [cont=0, i=0, j=2, MAX=2, str1={3:0}, str2={7:0}] [L29] i-- VAL [cont=0, i=-1, j=2, MAX=2, str1={3:0}, str2={7:0}] [L29] COND FALSE !(i >= 0) VAL [cont=0, i=-1, j=2, MAX=2, str1={3:0}, str2={7:0}] [L34] j = MAX-1 [L35] i=0 VAL [cont=0, i=0, j=1, MAX=2, str1={3:0}, str2={7:0}] [L35] COND TRUE i