/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/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 11:50:58,552 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 11:50:58,554 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 11:50:58,573 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 11:50:58,580 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 11:50:58,580 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 11:50:58,581 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 11:50:58,582 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 11:50:58,582 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 11:50:58,583 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 11:50:58,584 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 11:50:58,589 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 11:50:58,590 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 11:50:58,593 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 11:50:58,593 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 11:50:58,594 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 11:50:58,596 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 11:50:58,601 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 11:50:58,601 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 11:50:58,602 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 11:50:58,608 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 11:50:58,639 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 11:50:58,639 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 11:50:58,640 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 11:50:58,640 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 11:50:58,640 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 11:50:58,640 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 11:50:58,640 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 11:50:58,641 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 11:50:58,641 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 11:50:58,641 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 11:50:58,641 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 11:50:58,641 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 11:50:58,641 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 11:50:58,641 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 11:50:58,641 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 11:50:58,641 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 11:50:58,641 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 11:50:58,642 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 11:50:58,642 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 11:50:58,642 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 11:50:58,642 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:50:58,642 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 11:50:58,642 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 11:50:58,642 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 11:50:58,642 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 11:50:58,642 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 11:50:58,643 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 11:50:58,643 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 11:50:58,643 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 11:50:58,863 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 11:50:58,875 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 11:50:58,877 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 11:50:58,877 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 11:50:58,878 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 11:50:58,878 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2021-05-02 11:50:58,924 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a80637b9c/a8941175b99240b39947ce096f0d77f2/FLAG311c0e41f [2021-05-02 11:50:59,272 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 11:50:59,272 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2021-05-02 11:50:59,277 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a80637b9c/a8941175b99240b39947ce096f0d77f2/FLAG311c0e41f [2021-05-02 11:50:59,692 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a80637b9c/a8941175b99240b39947ce096f0d77f2 [2021-05-02 11:50:59,693 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 11:50:59,694 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 11:50:59,695 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 11:50:59,695 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 11:50:59,699 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 11:50:59,699 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:50:59" (1/1) ... [2021-05-02 11:50:59,701 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@61e2990b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:59, skipping insertion in model container [2021-05-02 11:50:59,701 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:50:59" (1/1) ... [2021-05-02 11:50:59,705 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 11:50:59,716 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 11:50:59,791 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/string-2.i[896,909] [2021-05-02 11:50:59,803 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:50:59,807 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 11:50:59,814 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/string-2.i[896,909] [2021-05-02 11:50:59,838 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:50:59,864 INFO L208 MainTranslator]: Completed translation [2021-05-02 11:50:59,864 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:59 WrapperNode [2021-05-02 11:50:59,864 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 11:50:59,865 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 11:50:59,865 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 11:50:59,865 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 11:50:59,871 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:59" (1/1) ... [2021-05-02 11:50:59,871 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:59" (1/1) ... [2021-05-02 11:50:59,876 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:59" (1/1) ... [2021-05-02 11:50:59,876 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:59" (1/1) ... [2021-05-02 11:50:59,881 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:59" (1/1) ... [2021-05-02 11:50:59,884 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:59" (1/1) ... [2021-05-02 11:50:59,893 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:59" (1/1) ... [2021-05-02 11:50:59,894 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 11:50:59,895 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 11:50:59,895 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 11:50:59,895 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 11:50:59,895 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:59" (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 11:50:59,951 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 11:50:59,952 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 11:50:59,952 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 11:50:59,952 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 11:50:59,952 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 11:50:59,952 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 11:50:59,952 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 11:50:59,953 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 11:50:59,953 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 11:50:59,953 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 11:50:59,953 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 11:50:59,953 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 11:50:59,954 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 11:50:59,954 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 11:50:59,954 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-05-02 11:50:59,954 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 11:50:59,954 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 11:50:59,955 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 11:50:59,955 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 11:50:59,955 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 11:50:59,955 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 11:50:59,955 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 11:51:00,194 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 11:51:00,195 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-02 11:51:00,195 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:51:00 BoogieIcfgContainer [2021-05-02 11:51:00,196 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 11:51:00,197 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 11:51:00,197 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 11:51:00,198 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 11:51:00,199 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:50:59" (1/3) ... [2021-05-02 11:51:00,199 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d7547bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:51:00, skipping insertion in model container [2021-05-02 11:51:00,199 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:50:59" (2/3) ... [2021-05-02 11:51:00,199 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d7547bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:51:00, skipping insertion in model container [2021-05-02 11:51:00,199 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:51:00" (3/3) ... [2021-05-02 11:51:00,200 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2021-05-02 11:51:00,204 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 11:51:00,206 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 11:51:00,216 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 11:51:00,231 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 11:51:00,231 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 11:51:00,231 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 11:51:00,231 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 11:51:00,231 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 11:51:00,232 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 11:51:00,232 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 11:51:00,232 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 11:51:00,242 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 28 states have internal predecessors, (43), 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 11:51:00,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 11:51:00,245 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:00,245 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, 1] [2021-05-02 11:51:00,245 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:00,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:00,249 INFO L82 PathProgramCache]: Analyzing trace with hash 739829093, now seen corresponding path program 1 times [2021-05-02 11:51:00,254 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:00,254 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826515072] [2021-05-02 11:51:00,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:00,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:00,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:00,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:00,438 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 11:51:00,438 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:00,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826515072] [2021-05-02 11:51:00,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1826515072] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:51:00,439 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:51:00,439 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 11:51:00,440 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269074314] [2021-05-02 11:51:00,442 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 11:51:00,443 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:00,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 11:51:00,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 11:51:00,464 INFO L87 Difference]: Start difference. First operand has 35 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 28 states have internal predecessors, (43), 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 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 11:51:00,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:00,601 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2021-05-02 11:51:00,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 11:51:00,603 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 22 [2021-05-02 11:51:00,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:00,608 INFO L225 Difference]: With dead ends: 73 [2021-05-02 11:51:00,608 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 11:51:00,610 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 28.4ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 11:51:00,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 11:51:00,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2021-05-02 11:51:00,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 3 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 11:51:00,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2021-05-02 11:51:00,641 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2021-05-02 11:51:00,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:00,641 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2021-05-02 11:51:00,642 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 11:51:00,642 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2021-05-02 11:51:00,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 11:51:00,643 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:00,643 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, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:00,643 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 11:51:00,644 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:00,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:00,645 INFO L82 PathProgramCache]: Analyzing trace with hash -1075962823, now seen corresponding path program 1 times [2021-05-02 11:51:00,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:00,645 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143416416] [2021-05-02 11:51:00,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:00,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:00,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:00,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:00,740 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 11:51:00,741 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:00,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143416416] [2021-05-02 11:51:00,742 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143416416] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:00,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [864601400] [2021-05-02 11:51:00,742 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 11:51:00,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:00,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 11:51:00,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:00,842 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:00,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:00,895 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 11:51:00,895 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [864601400] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:00,895 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:00,895 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 11:51:00,896 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1703680908] [2021-05-02 11:51:00,898 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 11:51:00,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:00,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 11:51:00,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 11:51:00,900 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 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 11:51:00,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:00,975 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2021-05-02 11:51:00,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:51:00,975 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 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 28 [2021-05-02 11:51:00,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:00,976 INFO L225 Difference]: With dead ends: 65 [2021-05-02 11:51:00,976 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 11:51:00,976 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 27.1ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 11:51:00,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 11:51:01,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2021-05-02 11:51:01,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 3 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 11:51:01,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2021-05-02 11:51:01,006 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2021-05-02 11:51:01,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:01,006 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2021-05-02 11:51:01,006 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 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 11:51:01,006 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2021-05-02 11:51:01,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 11:51:01,007 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:01,007 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, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:01,207 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 11:51:01,208 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:01,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:01,209 INFO L82 PathProgramCache]: Analyzing trace with hash 875420793, now seen corresponding path program 2 times [2021-05-02 11:51:01,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:01,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [504182985] [2021-05-02 11:51:01,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:01,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:01,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:01,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:01,263 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 11:51:01,263 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:01,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [504182985] [2021-05-02 11:51:01,264 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [504182985] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:01,264 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825052276] [2021-05-02 11:51:01,264 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 11:51:01,304 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:51:01,304 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:01,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 11:51:01,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:01,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:01,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:01,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:01,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:01,351 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 11:51:01,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1825052276] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:01,351 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:01,351 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 11:51:01,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464778185] [2021-05-02 11:51:01,352 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 11:51:01,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:01,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 11:51:01,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:51:01,352 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 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 11:51:01,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:01,416 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2021-05-02 11:51:01,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 11:51:01,417 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 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 32 [2021-05-02 11:51:01,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:01,417 INFO L225 Difference]: With dead ends: 75 [2021-05-02 11:51:01,417 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 11:51:01,418 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 22.7ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:51:01,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 11:51:01,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2021-05-02 11:51:01,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 33 states have internal predecessors, (39), 3 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 11:51:01,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-05-02 11:51:01,421 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2021-05-02 11:51:01,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:01,421 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-05-02 11:51:01,422 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.285714285714286) internal successors, (30), 6 states have internal predecessors, (30), 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 11:51:01,422 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-05-02 11:51:01,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 11:51:01,422 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:01,422 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, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:01,634 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:01,634 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:01,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:01,635 INFO L82 PathProgramCache]: Analyzing trace with hash 133934009, now seen corresponding path program 3 times [2021-05-02 11:51:01,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:01,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355440720] [2021-05-02 11:51:01,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:01,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:01,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:01,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:01,709 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 11:51:01,709 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:01,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355440720] [2021-05-02 11:51:01,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355440720] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:01,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1146850760] [2021-05-02 11:51:01,710 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 11:51:01,763 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 11:51:01,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:01,765 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 11:51:01,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:01,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:01,804 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:01,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:01,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:01,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:01,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:01,843 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-05-02 11:51:01,843 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1146850760] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:01,843 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:01,843 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 11:51:01,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872753172] [2021-05-02 11:51:01,844 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 11:51:01,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:01,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 11:51:01,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 11:51:01,845 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 8 states, 8 states have (on average 5.25) internal successors, (42), 7 states have internal predecessors, (42), 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 11:51:01,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:01,955 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2021-05-02 11:51:01,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 11:51:01,956 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.25) internal successors, (42), 7 states have internal predecessors, (42), 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 36 [2021-05-02 11:51:01,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:01,956 INFO L225 Difference]: With dead ends: 85 [2021-05-02 11:51:01,956 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 11:51:01,957 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 26.2ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 11:51:01,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 11:51:01,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2021-05-02 11:51:01,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.162162162162162) internal successors, (43), 37 states have internal predecessors, (43), 3 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 11:51:01,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2021-05-02 11:51:01,961 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2021-05-02 11:51:01,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:01,961 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2021-05-02 11:51:01,961 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 5.25) internal successors, (42), 7 states have internal predecessors, (42), 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 11:51:01,961 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2021-05-02 11:51:01,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 11:51:01,962 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:01,962 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:02,177 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:02,178 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:02,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:02,178 INFO L82 PathProgramCache]: Analyzing trace with hash 173558265, now seen corresponding path program 4 times [2021-05-02 11:51:02,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:02,178 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457228764] [2021-05-02 11:51:02,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:02,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:02,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:51:02,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:51:02,246 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 11:51:02,246 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:51:02,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457228764] [2021-05-02 11:51:02,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [457228764] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:02,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712049522] [2021-05-02 11:51:02,247 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 11:51:02,305 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 11:51:02,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:51:02,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 11:51:02,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:51:02,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:02,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:02,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:02,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:02,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:02,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:02,358 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:02,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:51:02,384 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 11:51:02,384 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1712049522] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:51:02,384 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:51:02,385 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 11:51:02,385 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513667189] [2021-05-02 11:51:02,385 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 11:51:02,385 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:51:02,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 11:51:02,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:51:02,386 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 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 11:51:02,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:51:02,479 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2021-05-02 11:51:02,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 11:51:02,480 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 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 40 [2021-05-02 11:51:02,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:51:02,481 INFO L225 Difference]: With dead ends: 93 [2021-05-02 11:51:02,481 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 11:51:02,481 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 35.1ms TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:51:02,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 11:51:02,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2021-05-02 11:51:02,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.146341463414634) internal successors, (47), 41 states have internal predecessors, (47), 3 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 11:51:02,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2021-05-02 11:51:02,485 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2021-05-02 11:51:02,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:51:02,485 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2021-05-02 11:51:02,485 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 3.7777777777777777) internal successors, (34), 8 states have internal predecessors, (34), 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 11:51:02,485 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2021-05-02 11:51:02,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 11:51:02,486 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:51:02,486 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:51:02,700 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:51:02,701 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:51:02,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:51:02,701 INFO L82 PathProgramCache]: Analyzing trace with hash -1461422279, now seen corresponding path program 5 times [2021-05-02 11:51:02,701 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:51:02,701 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104142070] [2021-05-02 11:51:02,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:51:02,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:51:02,724 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:51:02,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 11:51:02,742 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 11:51:02,758 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 11:51:02,758 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 11:51:02,758 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 11:51:02,787 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 11:51:02 BoogieIcfgContainer [2021-05-02 11:51:02,787 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 11:51:02,787 INFO L168 Benchmark]: Toolchain (without parser) took 3093.02 ms. Allocated memory was 176.2 MB in the beginning and 228.6 MB in the end (delta: 52.4 MB). Free memory was 140.2 MB in the beginning and 122.2 MB in the end (delta: 18.0 MB). Peak memory consumption was 70.5 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:02,787 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 176.2 MB. Free memory is still 156.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 11:51:02,787 INFO L168 Benchmark]: CACSL2BoogieTranslator took 169.21 ms. Allocated memory is still 176.2 MB. Free memory was 140.0 MB in the beginning and 158.5 MB in the end (delta: -18.5 MB). Peak memory consumption was 13.3 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:02,788 INFO L168 Benchmark]: Boogie Preprocessor took 29.40 ms. Allocated memory is still 176.2 MB. Free memory was 158.1 MB in the beginning and 156.3 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:02,788 INFO L168 Benchmark]: RCFGBuilder took 300.80 ms. Allocated memory is still 176.2 MB. Free memory was 156.3 MB in the beginning and 137.1 MB in the end (delta: 19.2 MB). Peak memory consumption was 18.9 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:02,788 INFO L168 Benchmark]: TraceAbstraction took 2590.16 ms. Allocated memory was 176.2 MB in the beginning and 228.6 MB in the end (delta: 52.4 MB). Free memory was 136.5 MB in the beginning and 122.2 MB in the end (delta: 14.3 MB). Peak memory consumption was 67.7 MB. Max. memory is 8.0 GB. [2021-05-02 11:51:02,788 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09 ms. Allocated memory is still 176.2 MB. Free memory is still 156.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 169.21 ms. Allocated memory is still 176.2 MB. Free memory was 140.0 MB in the beginning and 158.5 MB in the end (delta: -18.5 MB). Peak memory consumption was 13.3 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 29.40 ms. Allocated memory is still 176.2 MB. Free memory was 158.1 MB in the beginning and 156.3 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 300.80 ms. Allocated memory is still 176.2 MB. Free memory was 156.3 MB in the beginning and 137.1 MB in the end (delta: 19.2 MB). Peak memory consumption was 18.9 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2590.16 ms. Allocated memory was 176.2 MB in the beginning and 228.6 MB in the end (delta: 52.4 MB). Free memory was 136.5 MB in the beginning and 122.2 MB in the end (delta: 14.3 MB). Peak memory consumption was 67.7 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 20]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of shiftLeft at line 69. Possible FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 VAL [found=0, i=0, string_A={6:0}, string_B={9:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=1, string_A={6:0}, string_B={9:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=2, string_A={6:0}, string_B={9:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=3, string_A={6:0}, string_B={9:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=4, string_A={6:0}, string_B={9:0}] [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ VAL [found=0, i=5, string_A={6:0}, string_B={9:0}] [L35] COND FALSE !(i<5) VAL [found=0, i=5, string_A={6:0}, string_B={9:0}] [L37] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={6:0}, string_A[5 -1]=0, string_B={9:0}] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 VAL [found=0, i=0, string_A={6:0}, string_B={9:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=1, string_A={6:0}, string_B={9:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=2, string_A={6:0}, string_B={9:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=3, string_A={6:0}, string_B={9:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=4, string_A={6:0}, string_B={9:0}] [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ VAL [found=0, i=5, string_A={6:0}, string_B={9:0}] [L39] COND FALSE !(i<5) VAL [found=0, i=5, string_A={6:0}, string_B={9:0}] [L41] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={6:0}, string_B={9:0}, string_B[5 -1]=0] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={6:0}, string_B={9:0}] [L44] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={6:0}, string_A[nc_A]=0, string_B={9:0}] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={6:0}, string_B={9:0}] [L48] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={6:0}, string_B={9:0}, string_B[nc_B]=0] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={6:0}, string_B={9:0}] [L55] COND FALSE !((inc_B-1)<