/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/sum04-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 11:52:00,366 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 11:52:00,368 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 11:52:00,399 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 11:52:00,416 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 11:52:00,417 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 11:52:00,418 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 11:52:00,419 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 11:52:00,421 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 11:52:00,422 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 11:52:00,423 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 11:52:00,428 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 11:52:00,429 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 11:52:00,429 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 11:52:00,431 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 11:52:00,433 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 11:52:00,438 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 11:52:00,452 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 11:52:00,453 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 11:52:00,453 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 11:52:00,456 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 11:52:00,486 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 11:52:00,486 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 11:52:00,488 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 11:52:00,488 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 11:52:00,488 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 11:52:00,488 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 11:52:00,489 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 11:52:00,489 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 11:52:00,489 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 11:52:00,489 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 11:52:00,490 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 11:52:00,490 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 11:52:00,490 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 11:52:00,490 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 11:52:00,490 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 11:52:00,490 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 11:52:00,490 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 11:52:00,491 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 11:52:00,491 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 11:52:00,491 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 11:52:00,491 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 11:52:00,491 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 11:52:00,491 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 11:52:00,491 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 11:52:00,492 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 11:52:00,492 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 11:52:00,492 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 11:52:00,492 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 11:52:00,492 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 11:52:00,736 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 11:52:00,749 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 11:52:00,751 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 11:52:00,751 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 11:52:00,752 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 11:52:00,752 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum04-2.i [2021-05-02 11:52:00,792 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cf1b692c1/873f0f0c96764cf69335bce2fd819216/FLAG1a7558992 [2021-05-02 11:52:01,147 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 11:52:01,148 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum04-2.i [2021-05-02 11:52:01,153 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cf1b692c1/873f0f0c96764cf69335bce2fd819216/FLAG1a7558992 [2021-05-02 11:52:01,170 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cf1b692c1/873f0f0c96764cf69335bce2fd819216 [2021-05-02 11:52:01,172 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 11:52:01,174 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 11:52:01,177 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 11:52:01,177 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 11:52:01,179 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 11:52:01,180 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:52:01" (1/1) ... [2021-05-02 11:52:01,181 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d62a514 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:52:01, skipping insertion in model container [2021-05-02 11:52:01,181 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:52:01" (1/1) ... [2021-05-02 11:52:01,185 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 11:52:01,194 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 11:52:01,314 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/sum04-2.i[808,821] [2021-05-02 11:52:01,321 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:52:01,328 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 11:52:01,336 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/sum04-2.i[808,821] [2021-05-02 11:52:01,339 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 11:52:01,349 INFO L208 MainTranslator]: Completed translation [2021-05-02 11:52:01,350 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:52:01 WrapperNode [2021-05-02 11:52:01,350 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 11:52:01,351 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 11:52:01,351 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 11:52:01,352 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 11:52:01,364 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:52:01" (1/1) ... [2021-05-02 11:52:01,382 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:52:01" (1/1) ... [2021-05-02 11:52:01,386 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:52:01" (1/1) ... [2021-05-02 11:52:01,387 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:52:01" (1/1) ... [2021-05-02 11:52:01,390 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:52:01" (1/1) ... [2021-05-02 11:52:01,392 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:52:01" (1/1) ... [2021-05-02 11:52:01,395 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:52:01" (1/1) ... [2021-05-02 11:52:01,396 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 11:52:01,397 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 11:52:01,398 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 11:52:01,398 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 11:52:01,399 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:52:01" (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 11:52:01,461 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 11:52:01,461 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 11:52:01,462 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 11:52:01,462 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 11:52:01,462 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 11:52:01,462 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 11:52:01,462 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 11:52:01,462 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 11:52:01,462 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 11:52:01,462 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 11:52:01,463 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 11:52:01,463 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 11:52:01,463 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 11:52:01,463 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 11:52:01,464 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 11:52:01,464 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 11:52:01,464 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 11:52:01,464 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 11:52:01,464 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 11:52:01,642 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 11:52:01,642 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 11:52:01,643 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:52:01 BoogieIcfgContainer [2021-05-02 11:52:01,643 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 11:52:01,644 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 11:52:01,644 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 11:52:01,646 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 11:52:01,646 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:52:01" (1/3) ... [2021-05-02 11:52:01,647 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a7aa101 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:52:01, skipping insertion in model container [2021-05-02 11:52:01,647 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:52:01" (2/3) ... [2021-05-02 11:52:01,648 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1a7aa101 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:52:01, skipping insertion in model container [2021-05-02 11:52:01,648 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:52:01" (3/3) ... [2021-05-02 11:52:01,649 INFO L111 eAbstractionObserver]: Analyzing ICFG sum04-2.i [2021-05-02 11:52:01,653 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 11:52:01,655 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 11:52:01,666 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 11:52:01,683 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 11:52:01,684 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 11:52:01,684 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 11:52:01,684 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 11:52:01,684 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 11:52:01,684 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 11:52:01,684 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 11:52:01,684 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 11:52:01,696 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 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 11:52:01,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 11:52:01,698 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:52:01,699 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:52:01,699 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:52:01,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:52:01,705 INFO L82 PathProgramCache]: Analyzing trace with hash -1274873075, now seen corresponding path program 1 times [2021-05-02 11:52:01,710 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:52:01,710 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238422324] [2021-05-02 11:52:01,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:52:01,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:01,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:52:01,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:01,832 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 11:52:01,832 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:52:01,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238422324] [2021-05-02 11:52:01,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1238422324] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:52:01,833 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:52:01,833 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 11:52:01,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978457997] [2021-05-02 11:52:01,836 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 11:52:01,836 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:52:01,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 11:52:01,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:52:01,845 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 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 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11:52:01,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:52:01,911 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2021-05-02 11:52:01,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 11:52:01,912 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11 [2021-05-02 11:52:01,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:52:01,916 INFO L225 Difference]: With dead ends: 30 [2021-05-02 11:52:01,916 INFO L226 Difference]: Without dead ends: 13 [2021-05-02 11:52:01,918 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 32.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 11:52:01,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-02 11:52:01,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-02 11:52:01,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 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 11:52:01,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2021-05-02 11:52:01,941 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2021-05-02 11:52:01,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:52:01,942 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2021-05-02 11:52:01,942 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11:52:01,942 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2021-05-02 11:52:01,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 11:52:01,942 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:52:01,942 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:52:01,943 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 11:52:01,943 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:52:01,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:52:01,943 INFO L82 PathProgramCache]: Analyzing trace with hash -1280414201, now seen corresponding path program 1 times [2021-05-02 11:52:01,944 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:52:01,944 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329864707] [2021-05-02 11:52:01,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:52:01,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:02,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:52:02,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:02,013 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 11:52:02,014 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:52:02,014 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329864707] [2021-05-02 11:52:02,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [329864707] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:52:02,014 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 11:52:02,014 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 11:52:02,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117883014] [2021-05-02 11:52:02,015 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 11:52:02,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:52:02,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 11:52:02,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 11:52:02,016 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 11:52:02,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:52:02,053 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2021-05-02 11:52:02,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 11:52:02,053 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 11 [2021-05-02 11:52:02,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:52:02,054 INFO L225 Difference]: With dead ends: 20 [2021-05-02 11:52:02,054 INFO L226 Difference]: Without dead ends: 15 [2021-05-02 11:52:02,055 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 47.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-02 11:52:02,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-02 11:52:02,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-05-02 11:52:02,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 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 11:52:02,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2021-05-02 11:52:02,059 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2021-05-02 11:52:02,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:52:02,059 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2021-05-02 11:52:02,059 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 11:52:02,059 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2021-05-02 11:52:02,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-02 11:52:02,059 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:52:02,060 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:52:02,060 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 11:52:02,060 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:52:02,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:52:02,061 INFO L82 PathProgramCache]: Analyzing trace with hash -985852763, now seen corresponding path program 1 times [2021-05-02 11:52:02,061 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:52:02,061 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041971553] [2021-05-02 11:52:02,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:52:02,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:02,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:52:02,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:02,110 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:02,110 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:52:02,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041971553] [2021-05-02 11:52:02,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041971553] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:02,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1173869888] [2021-05-02 11:52:02,111 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 11:52:02,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:02,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 11:52:02,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:52:02,215 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:02,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:02,251 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:02,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1173869888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:02,252 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:52:02,252 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-02 11:52:02,252 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030444577] [2021-05-02 11:52:02,253 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 11:52:02,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:52:02,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 11:52:02,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 11:52:02,256 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 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 11:52:02,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:52:02,345 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2021-05-02 11:52:02,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 11:52:02,347 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 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 13 [2021-05-02 11:52:02,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:52:02,349 INFO L225 Difference]: With dead ends: 22 [2021-05-02 11:52:02,349 INFO L226 Difference]: Without dead ends: 17 [2021-05-02 11:52:02,350 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 76.8ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 11:52:02,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-02 11:52:02,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-05-02 11:52:02,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 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 11:52:02,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2021-05-02 11:52:02,353 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2021-05-02 11:52:02,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:52:02,354 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2021-05-02 11:52:02,354 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 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 11:52:02,354 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2021-05-02 11:52:02,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-02 11:52:02,354 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:52:02,354 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:52:02,555 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 11:52:02,555 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:52:02,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:52:02,556 INFO L82 PathProgramCache]: Analyzing trace with hash -1380152381, now seen corresponding path program 2 times [2021-05-02 11:52:02,556 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:52:02,556 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1100874356] [2021-05-02 11:52:02,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:52:02,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:02,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:52:02,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:02,626 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:02,626 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:52:02,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1100874356] [2021-05-02 11:52:02,627 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1100874356] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:02,627 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805769670] [2021-05-02 11:52:02,627 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 11:52:02,660 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:52:02,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:52:02,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 11:52:02,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:52:02,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:02,680 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:02,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:02,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:02,695 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:02,695 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805769670] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:02,695 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:52:02,695 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-02 11:52:02,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302178835] [2021-05-02 11:52:02,695 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 11:52:02,696 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:52:02,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 11:52:02,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 11:52:02,696 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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 11:52:02,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:52:02,779 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2021-05-02 11:52:02,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 11:52:02,780 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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 15 [2021-05-02 11:52:02,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:52:02,781 INFO L225 Difference]: With dead ends: 24 [2021-05-02 11:52:02,781 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 11:52:02,781 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 72.1ms TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2021-05-02 11:52:02,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 11:52:02,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-05-02 11:52:02,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 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 11:52:02,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2021-05-02 11:52:02,787 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2021-05-02 11:52:02,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:52:02,787 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2021-05-02 11:52:02,787 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 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 11:52:02,787 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2021-05-02 11:52:02,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 11:52:02,788 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:52:02,788 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:52:03,000 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:52:03,001 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:52:03,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:52:03,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1950004065, now seen corresponding path program 3 times [2021-05-02 11:52:03,002 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:52:03,002 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164499017] [2021-05-02 11:52:03,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:52:03,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:03,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:52:03,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:03,090 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:03,090 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:52:03,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164499017] [2021-05-02 11:52:03,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164499017] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:03,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [339990661] [2021-05-02 11:52:03,090 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 11:52:03,124 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 11:52:03,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:52:03,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 11:52:03,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:52:03,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,180 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:03,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [339990661] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:03,180 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:52:03,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2021-05-02 11:52:03,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928247197] [2021-05-02 11:52:03,181 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 11:52:03,181 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:52:03,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 11:52:03,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 11:52:03,181 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 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 11:52:03,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:52:03,293 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2021-05-02 11:52:03,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 11:52:03,294 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 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 17 [2021-05-02 11:52:03,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:52:03,295 INFO L225 Difference]: With dead ends: 26 [2021-05-02 11:52:03,295 INFO L226 Difference]: Without dead ends: 21 [2021-05-02 11:52:03,296 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 109.3ms TimeCoverageRelationStatistics Valid=52, Invalid=80, Unknown=0, NotChecked=0, Total=132 [2021-05-02 11:52:03,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-02 11:52:03,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-05-02 11:52:03,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 15 states have internal predecessors, (16), 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 11:52:03,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2021-05-02 11:52:03,301 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2021-05-02 11:52:03,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:52:03,301 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2021-05-02 11:52:03,301 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 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 11:52:03,301 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2021-05-02 11:52:03,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 11:52:03,302 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:52:03,302 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:52:03,517 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:52:03,518 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:52:03,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:52:03,518 INFO L82 PathProgramCache]: Analyzing trace with hash -1815254145, now seen corresponding path program 4 times [2021-05-02 11:52:03,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:52:03,518 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711717579] [2021-05-02 11:52:03,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:52:03,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:03,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:52:03,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:03,601 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:03,601 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:52:03,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1711717579] [2021-05-02 11:52:03,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1711717579] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:03,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2004304466] [2021-05-02 11:52:03,601 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 11:52:03,662 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 11:52:03,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:52:03,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2021-05-02 11:52:03,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:52:03,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,692 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:03,717 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:03,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2004304466] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:03,718 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:52:03,718 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2021-05-02 11:52:03,718 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135037897] [2021-05-02 11:52:03,718 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 11:52:03,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:52:03,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 11:52:03,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 11:52:03,719 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 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 11:52:03,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:52:03,838 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2021-05-02 11:52:03,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 11:52:03,839 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 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 19 [2021-05-02 11:52:03,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:52:03,840 INFO L225 Difference]: With dead ends: 28 [2021-05-02 11:52:03,840 INFO L226 Difference]: Without dead ends: 23 [2021-05-02 11:52:03,841 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 112.4ms TimeCoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182 [2021-05-02 11:52:03,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-02 11:52:03,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-02 11:52:03,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 17 states have internal predecessors, (18), 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 11:52:03,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2021-05-02 11:52:03,846 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2021-05-02 11:52:03,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:52:03,846 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2021-05-02 11:52:03,846 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 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 11:52:03,846 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2021-05-02 11:52:03,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 11:52:03,846 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:52:03,847 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:52:04,049 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:52:04,049 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:52:04,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:52:04,050 INFO L82 PathProgramCache]: Analyzing trace with hash 429036573, now seen corresponding path program 5 times [2021-05-02 11:52:04,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:52:04,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112447127] [2021-05-02 11:52:04,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:52:04,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:04,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:52:04,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:04,122 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:04,122 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:52:04,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112447127] [2021-05-02 11:52:04,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112447127] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:04,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236098850] [2021-05-02 11:52:04,123 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 11:52:04,164 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 11:52:04,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:52:04,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 11:52:04,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:52:04,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,203 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,205 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,211 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:04,211 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1236098850] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:04,211 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:52:04,211 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2021-05-02 11:52:04,212 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342152961] [2021-05-02 11:52:04,212 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 11:52:04,212 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:52:04,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 11:52:04,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 11:52:04,213 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 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 11:52:04,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:52:04,342 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2021-05-02 11:52:04,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 11:52:04,342 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 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 21 [2021-05-02 11:52:04,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:52:04,343 INFO L225 Difference]: With dead ends: 30 [2021-05-02 11:52:04,343 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 11:52:04,343 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 126.8ms TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2021-05-02 11:52:04,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 11:52:04,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-05-02 11:52:04,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 19 states have internal predecessors, (20), 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 11:52:04,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2021-05-02 11:52:04,346 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2021-05-02 11:52:04,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:52:04,346 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2021-05-02 11:52:04,346 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 9 states have internal predecessors, (21), 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 11:52:04,346 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2021-05-02 11:52:04,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 11:52:04,347 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:52:04,347 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:52:04,560 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 11:52:04,561 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:52:04,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:52:04,561 INFO L82 PathProgramCache]: Analyzing trace with hash 1118833979, now seen corresponding path program 6 times [2021-05-02 11:52:04,561 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:52:04,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085681120] [2021-05-02 11:52:04,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:52:04,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:04,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:52:04,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:04,621 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:04,621 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:52:04,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085681120] [2021-05-02 11:52:04,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2085681120] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:04,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161472908] [2021-05-02 11:52:04,621 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 11:52:04,665 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 11:52:04,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:52:04,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2021-05-02 11:52:04,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:52:04,681 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,690 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,698 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,702 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:04,724 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:04,724 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1161472908] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:04,724 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:52:04,724 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2021-05-02 11:52:04,724 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594515799] [2021-05-02 11:52:04,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 11:52:04,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:52:04,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 11:52:04,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2021-05-02 11:52:04,725 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 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 11:52:04,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:52:04,896 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2021-05-02 11:52:04,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 11:52:04,896 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 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 11:52:04,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:52:04,897 INFO L225 Difference]: With dead ends: 32 [2021-05-02 11:52:04,897 INFO L226 Difference]: Without dead ends: 27 [2021-05-02 11:52:04,897 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 150.1ms TimeCoverageRelationStatistics Valid=118, Invalid=188, Unknown=0, NotChecked=0, Total=306 [2021-05-02 11:52:04,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-02 11:52:04,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-02 11:52:04,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 21 states have internal predecessors, (22), 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 11:52:04,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2021-05-02 11:52:04,900 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2021-05-02 11:52:04,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:52:04,901 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2021-05-02 11:52:04,901 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 10 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 11:52:04,901 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2021-05-02 11:52:04,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 11:52:04,901 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:52:04,901 INFO L523 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:52:05,117 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:52:05,117 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:52:05,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:52:05,118 INFO L82 PathProgramCache]: Analyzing trace with hash -1705789735, now seen corresponding path program 7 times [2021-05-02 11:52:05,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:52:05,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1194842858] [2021-05-02 11:52:05,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:52:05,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:05,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:52:05,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:05,242 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:05,242 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:52:05,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1194842858] [2021-05-02 11:52:05,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1194842858] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:05,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489759740] [2021-05-02 11:52:05,243 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:52:05,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:05,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 11:52:05,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:52:05,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,371 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,383 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,412 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:05,418 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:05,418 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489759740] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:05,418 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:52:05,418 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2021-05-02 11:52:05,419 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928381135] [2021-05-02 11:52:05,419 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 11:52:05,419 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:52:05,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 11:52:05,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2021-05-02 11:52:05,419 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 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 11:52:05,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:52:05,677 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2021-05-02 11:52:05,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 11:52:05,677 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 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 25 [2021-05-02 11:52:05,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:52:05,678 INFO L225 Difference]: With dead ends: 33 [2021-05-02 11:52:05,678 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 11:52:05,678 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 237.2ms TimeCoverageRelationStatistics Valid=146, Invalid=234, Unknown=0, NotChecked=0, Total=380 [2021-05-02 11:52:05,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 11:52:05,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 11:52:05,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 23 states have internal predecessors, (24), 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 11:52:05,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2021-05-02 11:52:05,681 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2021-05-02 11:52:05,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:52:05,681 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2021-05-02 11:52:05,681 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 11 states have internal predecessors, (25), 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 11:52:05,681 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2021-05-02 11:52:05,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 11:52:05,682 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:52:05,682 INFO L523 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:52:05,897 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:52:05,897 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:52:05,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:52:05,897 INFO L82 PathProgramCache]: Analyzing trace with hash -1749847817, now seen corresponding path program 8 times [2021-05-02 11:52:05,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:52:05,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522047346] [2021-05-02 11:52:05,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:52:05,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:06,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:52:06,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:06,041 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:06,041 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:52:06,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522047346] [2021-05-02 11:52:06,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1522047346] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:06,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321591281] [2021-05-02 11:52:06,041 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:52:06,079 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 11:52:06,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:52:06,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 11:52:06,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:52:06,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:06,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:06,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:06,178 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:06,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1321591281] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:06,178 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-02 11:52:06,178 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 16 [2021-05-02 11:52:06,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1606919273] [2021-05-02 11:52:06,178 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 11:52:06,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:52:06,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 11:52:06,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2021-05-02 11:52:06,179 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand has 16 states, 16 states have (on average 1.625) internal successors, (26), 13 states have internal predecessors, (26), 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 11:52:06,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:52:06,562 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2021-05-02 11:52:06,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 11:52:06,563 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.625) internal successors, (26), 13 states have internal predecessors, (26), 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 27 [2021-05-02 11:52:06,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:52:06,563 INFO L225 Difference]: With dead ends: 35 [2021-05-02 11:52:06,563 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 11:52:06,564 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 308.7ms TimeCoverageRelationStatistics Valid=80, Invalid=622, Unknown=0, NotChecked=0, Total=702 [2021-05-02 11:52:06,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 11:52:06,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 11:52:06,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.04) internal successors, (26), 25 states have internal predecessors, (26), 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 11:52:06,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2021-05-02 11:52:06,567 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2021-05-02 11:52:06,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:52:06,567 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2021-05-02 11:52:06,567 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.625) internal successors, (26), 13 states have internal predecessors, (26), 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 11:52:06,567 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2021-05-02 11:52:06,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 11:52:06,568 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 11:52:06,568 INFO L523 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 11:52:06,781 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 11:52:06,781 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 11:52:06,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 11:52:06,782 INFO L82 PathProgramCache]: Analyzing trace with hash -1139991659, now seen corresponding path program 9 times [2021-05-02 11:52:06,782 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 11:52:06,782 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921905498] [2021-05-02 11:52:06,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 11:52:06,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:06,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 11:52:06,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 11:52:06,909 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 66 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:06,909 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 11:52:06,909 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921905498] [2021-05-02 11:52:06,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1921905498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 11:52:06,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671621169] [2021-05-02 11:52:06,910 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:52:06,954 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-05-02 11:52:06,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 11:52:06,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 11:52:06,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 11:52:06,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:06,972 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:06,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:06,977 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:06,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:06,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:06,996 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:06,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:07,002 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:07,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:07,010 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:07,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:07,014 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:07,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:07,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:07,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 11:52:07,034 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 81 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 11:52:07,034 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1671621169] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 11:52:07,034 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-02 11:52:07,034 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [12] total 13 [2021-05-02 11:52:07,034 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601022481] [2021-05-02 11:52:07,035 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 11:52:07,035 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 11:52:07,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 11:52:07,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2021-05-02 11:52:07,036 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 2 states have call successors, (3), 2 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 11:52:07,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 11:52:07,063 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2021-05-02 11:52:07,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 11:52:07,064 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 2 states have call successors, (3), 2 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 29 [2021-05-02 11:52:07,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 11:52:07,065 INFO L225 Difference]: With dead ends: 30 [2021-05-02 11:52:07,065 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 11:52:07,065 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 92.5ms TimeCoverageRelationStatistics Valid=60, Invalid=96, Unknown=0, NotChecked=0, Total=156 [2021-05-02 11:52:07,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 11:52:07,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 11:52:07,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 11:52:07,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 11:52:07,066 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 29 [2021-05-02 11:52:07,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 11:52:07,066 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 11:52:07,066 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 states have internal predecessors, (25), 2 states have call successors, (3), 2 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 11:52:07,066 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 11:52:07,066 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 11:52:07,267 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 11:52:07,268 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 11:52:07,453 WARN L205 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 60 [2021-05-02 11:52:07,456 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 12) no Hoare annotation was computed. [2021-05-02 11:52:07,456 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 12) no Hoare annotation was computed. [2021-05-02 11:52:07,456 INFO L198 CegarLoopUtils]: For program point L12-1(line 12) no Hoare annotation was computed. [2021-05-02 11:52:07,456 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-02 11:52:07,457 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string0.offset| |old(#t~string0.offset)|) (= |old(#length)| |#length|) (= |#t~string1.base| |old(#t~string1.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string0.base| |old(#t~string0.base)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|) (= |#t~string1.offset| |old(#t~string1.offset)|)) [2021-05-02 11:52:07,457 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-02 11:52:07,457 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-02 11:52:07,457 INFO L201 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: true [2021-05-02 11:52:07,457 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-02 11:52:07,457 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-02 11:52:07,457 INFO L201 CegarLoopUtils]: At program point mainENTRY(lines 22 28) the Hoare annotation is: true [2021-05-02 11:52:07,457 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 22 28) no Hoare annotation was computed. [2021-05-02 11:52:07,457 INFO L198 CegarLoopUtils]: For program point L24-2(lines 24 26) no Hoare annotation was computed. [2021-05-02 11:52:07,468 INFO L194 CegarLoopUtils]: At program point L24-3(lines 24 26) the Hoare annotation is: (or (and (<= main_~i~0 4) (<= 6 main_~sn~0) (<= 4 main_~i~0) (<= main_~sn~0 6)) (and (<= 7 main_~i~0) (<= main_~i~0 7) (<= 12 main_~sn~0) (<= main_~sn~0 12)) (and (<= main_~sn~0 4) (<= 3 main_~i~0) (<= main_~i~0 3) (<= 4 main_~sn~0)) (and (<= 9 main_~i~0) (<= main_~sn~0 16) (< 15 main_~sn~0)) (and (<= main_~i~0 6) (<= 10 main_~sn~0) (<= main_~sn~0 10) (<= 6 main_~i~0)) (and (<= 2 main_~i~0) (<= main_~sn~0 2) (<= 2 main_~sn~0) (<= main_~i~0 2)) (and (<= main_~sn~0 8) (<= 5 main_~i~0) (<= main_~i~0 5) (<= 8 main_~sn~0)) (and (<= main_~i~0 8) (<= 8 main_~i~0) (<= main_~sn~0 14) (<= 14 main_~sn~0)) (and (= main_~sn~0 0) (= main_~i~0 1))) [2021-05-02 11:52:07,468 INFO L194 CegarLoopUtils]: At program point L24-4(lines 24 26) the Hoare annotation is: (and (<= main_~sn~0 16) (< 15 main_~sn~0)) [2021-05-02 11:52:07,468 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 22 28) no Hoare annotation was computed. [2021-05-02 11:52:07,468 INFO L198 CegarLoopUtils]: For program point L16(line 16) no Hoare annotation was computed. [2021-05-02 11:52:07,468 INFO L198 CegarLoopUtils]: For program point L15(lines 15 17) no Hoare annotation was computed. [2021-05-02 11:52:07,468 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 14 19) the Hoare annotation is: true [2021-05-02 11:52:07,468 INFO L198 CegarLoopUtils]: For program point L15-2(lines 14 19) no Hoare annotation was computed. [2021-05-02 11:52:07,468 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertEXIT(lines 14 19) no Hoare annotation was computed. [2021-05-02 11:52:07,469 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 16) no Hoare annotation was computed. [2021-05-02 11:52:07,480 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 11:52:07 BoogieIcfgContainer [2021-05-02 11:52:07,480 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 11:52:07,481 INFO L168 Benchmark]: Toolchain (without parser) took 6307.40 ms. Allocated memory was 217.1 MB in the beginning and 261.1 MB in the end (delta: 44.0 MB). Free memory was 181.9 MB in the beginning and 242.7 MB in the end (delta: -60.8 MB). Peak memory consumption was 134.7 MB. Max. memory is 8.0 GB. [2021-05-02 11:52:07,481 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 217.1 MB. Free memory is still 198.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 11:52:07,481 INFO L168 Benchmark]: CACSL2BoogieTranslator took 173.44 ms. Allocated memory is still 217.1 MB. Free memory was 181.7 MB in the beginning and 172.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2021-05-02 11:52:07,481 INFO L168 Benchmark]: Boogie Preprocessor took 45.97 ms. Allocated memory is still 217.1 MB. Free memory was 172.4 MB in the beginning and 200.2 MB in the end (delta: -27.8 MB). Peak memory consumption was 3.6 MB. Max. memory is 8.0 GB. [2021-05-02 11:52:07,481 INFO L168 Benchmark]: RCFGBuilder took 245.67 ms. Allocated memory is still 217.1 MB. Free memory was 200.2 MB in the beginning and 186.6 MB in the end (delta: 13.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2021-05-02 11:52:07,481 INFO L168 Benchmark]: TraceAbstraction took 5835.98 ms. Allocated memory was 217.1 MB in the beginning and 261.1 MB in the end (delta: 44.0 MB). Free memory was 186.0 MB in the beginning and 242.7 MB in the end (delta: -56.6 MB). Peak memory consumption was 138.4 MB. Max. memory is 8.0 GB. [2021-05-02 11:52:07,482 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 217.1 MB. Free memory is still 198.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 173.44 ms. Allocated memory is still 217.1 MB. Free memory was 181.7 MB in the beginning and 172.4 MB in the end (delta: 9.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 45.97 ms. Allocated memory is still 217.1 MB. Free memory was 172.4 MB in the beginning and 200.2 MB in the end (delta: -27.8 MB). Peak memory consumption was 3.6 MB. Max. memory is 8.0 GB. * RCFGBuilder took 245.67 ms. Allocated memory is still 217.1 MB. Free memory was 200.2 MB in the beginning and 186.6 MB in the end (delta: 13.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 5835.98 ms. Allocated memory was 217.1 MB in the beginning and 261.1 MB in the end (delta: 44.0 MB). Free memory was 186.0 MB in the beginning and 242.7 MB in the end (delta: -56.6 MB). Peak memory consumption was 138.4 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 16]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 22 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 5585.4ms, OverallIterations: 11, TraceHistogramMax: 9, EmptinessCheckTime: 8.7ms, AutomataDifference: 1517.1ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 188.5ms, InitialAbstractionConstructionTime: 9.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 120 SDtfs, 156 SDslu, 245 SDs, 0 SdLazy, 562 SolverSat, 76 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 417.8ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 327 GetRequests, 201 SyntacticMatches, 2 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 1366.2ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=30occurred in iteration=10, InterpolantAutomatonStates: 88, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 46.7ms AutomataMinimizationTime, 11 MinimizatonAttempts, 7 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 7 LocationsWithAnnotation, 17 PreInvPairs, 27 NumberOfFragments, 145 HoareAnnotationTreeSize, 17 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 21.9ms HoareSimplificationTime, 7 FomulaSimplificationsInter, 299 FormulaSimplificationTreeSizeReductionInter, 159.3ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 86.9ms SsaConstructionTime, 194.8ms SatisfiabilityAnalysisTime, 1479.7ms InterpolantComputationTime, 400 NumberOfCodeBlocks, 398 NumberOfCodeBlocksAsserted, 45 NumberOfCheckSat, 380 ConstructedInterpolants, 0 QuantifiedInterpolants, 1184 SizeOfPredicates, 1 NumberOfNonLiveVariables, 855 ConjunctsInSsa, 76 ConjunctsInUnsatCore, 20 InterpolantComputations, 3 PerfectInterpolantSequences, 147/570 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: ((((((((((i <= 4 && 6 <= sn) && 4 <= i) && sn <= 6) || (((7 <= i && i <= 7) && 12 <= sn) && sn <= 12)) || (((sn <= 4 && 3 <= i) && i <= 3) && 4 <= sn)) || ((9 <= i && sn <= 16) && 15 < sn)) || (((i <= 6 && 10 <= sn) && sn <= 10) && 6 <= i)) || (((2 <= i && sn <= 2) && 2 <= sn) && i <= 2)) || (((sn <= 8 && 5 <= i) && i <= 5) && 8 <= sn)) || (((i <= 8 && 8 <= i) && sn <= 14) && 14 <= sn)) || (sn == 0 && i == 1) RESULT: Ultimate proved your program to be correct! Received shutdown request...