/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/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 23:02:12,641 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 23:02:12,643 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 23:02:12,671 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 23:02:12,690 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 23:02:12,691 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 23:02:12,692 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 23:02:12,693 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 23:02:12,694 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 23:02:12,695 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 23:02:12,696 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 23:02:12,708 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 23:02:12,713 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 23:02:12,721 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 23:02:12,722 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 23:02:12,723 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 23:02:12,725 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 23:02:12,736 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 23:02:12,739 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 23:02:12,740 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 23:02:12,744 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-02 23:02:12,758 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 23:02:12,758 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 23:02:12,761 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 23:02:12,761 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 23:02:12,762 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 23:02:12,762 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 23:02:12,762 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 23:02:12,762 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 23:02:12,762 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 23:02:12,762 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 23:02:12,763 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 23:02:12,763 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 23:02:12,763 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 23:02:12,764 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 23:02:12,764 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 23:02:12,764 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 23:02:12,764 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-02 23:02:12,764 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 23:02:12,764 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 23:02:12,764 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 23:02:12,765 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-02 23:02:12,765 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 23:02:12,765 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-02 23:02:12,765 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 23:02:13,044 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 23:02:13,062 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 23:02:13,065 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 23:02:13,065 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 23:02:13,066 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 23:02:13,067 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2021-05-02 23:02:13,117 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c4fa71f3a/22288f495eb94cb28f901d9566f16b8c/FLAG6126b05af [2021-05-02 23:02:13,548 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 23:02:13,549 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2021-05-02 23:02:13,555 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c4fa71f3a/22288f495eb94cb28f901d9566f16b8c/FLAG6126b05af [2021-05-02 23:02:13,565 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c4fa71f3a/22288f495eb94cb28f901d9566f16b8c [2021-05-02 23:02:13,568 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 23:02:13,569 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 23:02:13,570 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 23:02:13,571 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 23:02:13,574 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 23:02:13,575 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:02:13" (1/1) ... [2021-05-02 23:02:13,576 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ae55fa5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:02:13, skipping insertion in model container [2021-05-02 23:02:13,576 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 11:02:13" (1/1) ... [2021-05-02 23:02:13,594 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 23:02:13,607 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 23:02:13,742 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i[896,909] [2021-05-02 23:02:13,791 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:02:13,798 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 23:02:13,812 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i[896,909] [2021-05-02 23:02:13,850 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 23:02:13,868 INFO L208 MainTranslator]: Completed translation [2021-05-02 23:02:13,869 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:02:13 WrapperNode [2021-05-02 23:02:13,869 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 23:02:13,870 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 23:02:13,870 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 23:02:13,870 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 23:02:13,881 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:02:13" (1/1) ... [2021-05-02 23:02:13,882 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:02:13" (1/1) ... [2021-05-02 23:02:13,894 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:02:13" (1/1) ... [2021-05-02 23:02:13,895 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:02:13" (1/1) ... [2021-05-02 23:02:13,913 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:02:13" (1/1) ... [2021-05-02 23:02:13,917 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:02:13" (1/1) ... [2021-05-02 23:02:13,918 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:02:13" (1/1) ... [2021-05-02 23:02:13,920 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 23:02:13,921 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 23:02:13,921 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 23:02:13,921 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 23:02:13,921 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:02:13" (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 23:02:13,998 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 23:02:13,998 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 23:02:13,999 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 23:02:13,999 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 23:02:13,999 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 23:02:13,999 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 23:02:13,999 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 23:02:13,999 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 23:02:14,000 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 23:02:14,000 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 23:02:14,000 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 23:02:14,001 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 23:02:14,001 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 23:02:14,002 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 23:02:14,002 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2021-05-02 23:02:14,002 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 23:02:14,002 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 23:02:14,003 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 23:02:14,003 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 23:02:14,004 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 23:02:14,004 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 23:02:14,004 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 23:02:14,375 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 23:02:14,376 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-02 23:02:14,377 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:02:14 BoogieIcfgContainer [2021-05-02 23:02:14,377 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 23:02:14,378 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 23:02:14,379 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 23:02:14,381 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 23:02:14,381 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 11:02:13" (1/3) ... [2021-05-02 23:02:14,382 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b8e923 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:02:14, skipping insertion in model container [2021-05-02 23:02:14,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 11:02:13" (2/3) ... [2021-05-02 23:02:14,382 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b8e923 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 11:02:14, skipping insertion in model container [2021-05-02 23:02:14,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 11:02:14" (3/3) ... [2021-05-02 23:02:14,386 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2021-05-02 23:02:14,390 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-02 23:02:14,393 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 23:02:14,405 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 23:02:14,425 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 23:02:14,425 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 23:02:14,425 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-02 23:02:14,425 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 23:02:14,426 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 23:02:14,426 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 23:02:14,426 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 23:02:14,426 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 23:02:14,438 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 28 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 23:02:14,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 23:02:14,444 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:14,445 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:14,445 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:14,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:14,449 INFO L82 PathProgramCache]: Analyzing trace with hash 739829093, now seen corresponding path program 1 times [2021-05-02 23:02:14,456 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:14,456 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563751202] [2021-05-02 23:02:14,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:14,502 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:14,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:14,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:14,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:14,683 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 23:02:14,684 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:14,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563751202] [2021-05-02 23:02:14,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [563751202] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:14,686 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:14,686 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 23:02:14,687 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232883741] [2021-05-02 23:02:14,690 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 23:02:14,690 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:14,728 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 23:02:14,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 23:02:14,731 INFO L87 Difference]: Start difference. First operand has 35 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 28 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:02:14,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:14,917 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2021-05-02 23:02:14,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 23:02:14,919 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2021-05-02 23:02:14,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:14,925 INFO L225 Difference]: With dead ends: 73 [2021-05-02 23:02:14,926 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 23:02:14,928 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 38.4ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 23:02:14,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 23:02:14,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2021-05-02 23:02:14,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 25 states have (on average 1.24) internal successors, (31), 25 states have internal predecessors, (31), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:02:14,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2021-05-02 23:02:14,974 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2021-05-02 23:02:14,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:14,974 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2021-05-02 23:02:14,975 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:02:14,975 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2021-05-02 23:02:14,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 23:02:14,975 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:14,976 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:14,976 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 23:02:14,976 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:14,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:14,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1075962823, now seen corresponding path program 1 times [2021-05-02 23:02:14,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:14,977 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [815593275] [2021-05-02 23:02:14,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:15,021 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:15,042 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:15,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:15,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:15,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:15,130 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 23:02:15,130 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:15,130 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [815593275] [2021-05-02 23:02:15,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [815593275] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:15,131 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:15,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 23:02:15,131 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138860209] [2021-05-02 23:02:15,132 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 23:02:15,132 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:15,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 23:02:15,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 23:02:15,133 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 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 23:02:15,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:15,223 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2021-05-02 23:02:15,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 23:02:15,224 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 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 28 [2021-05-02 23:02:15,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:15,225 INFO L225 Difference]: With dead ends: 65 [2021-05-02 23:02:15,225 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 23:02:15,226 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 25.6ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 23:02:15,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 23:02:15,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2021-05-02 23:02:15,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 29 states have (on average 1.206896551724138) internal successors, (35), 29 states have internal predecessors, (35), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:02:15,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2021-05-02 23:02:15,233 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2021-05-02 23:02:15,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:15,233 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2021-05-02 23:02:15,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.8) internal successors, (24), 4 states have internal predecessors, (24), 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 23:02:15,234 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2021-05-02 23:02:15,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 23:02:15,235 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:15,235 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:15,235 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 23:02:15,235 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:15,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:15,236 INFO L82 PathProgramCache]: Analyzing trace with hash 875420793, now seen corresponding path program 2 times [2021-05-02 23:02:15,236 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:15,236 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [136292] [2021-05-02 23:02:15,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:15,241 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:15,243 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:15,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:15,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:15,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:15,328 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 23:02:15,328 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:15,328 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [136292] [2021-05-02 23:02:15,328 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [136292] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:15,329 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:15,329 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 23:02:15,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1894187474] [2021-05-02 23:02:15,329 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 23:02:15,329 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:15,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 23:02:15,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 23:02:15,331 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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 23:02:15,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:15,451 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2021-05-02 23:02:15,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 23:02:15,452 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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 32 [2021-05-02 23:02:15,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:15,453 INFO L225 Difference]: With dead ends: 75 [2021-05-02 23:02:15,453 INFO L226 Difference]: Without dead ends: 52 [2021-05-02 23:02:15,454 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 31.4ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 23:02:15,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-05-02 23:02:15,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2021-05-02 23:02:15,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 33 states have (on average 1.1818181818181819) internal successors, (39), 33 states have internal predecessors, (39), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:02:15,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2021-05-02 23:02:15,463 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2021-05-02 23:02:15,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:15,463 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2021-05-02 23:02:15,463 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 5 states have internal predecessors, (26), 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 23:02:15,464 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2021-05-02 23:02:15,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 23:02:15,464 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:15,465 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:15,465 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-02 23:02:15,465 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:15,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:15,465 INFO L82 PathProgramCache]: Analyzing trace with hash 133934009, now seen corresponding path program 3 times [2021-05-02 23:02:15,466 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:15,466 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [813235486] [2021-05-02 23:02:15,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:15,478 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:15,480 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:15,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:15,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:15,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:15,623 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 23:02:15,623 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:15,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [813235486] [2021-05-02 23:02:15,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [813235486] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:15,624 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:15,624 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 23:02:15,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1551199078] [2021-05-02 23:02:15,625 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 23:02:15,625 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:15,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 23:02:15,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 23:02:15,626 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 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 23:02:15,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:15,749 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2021-05-02 23:02:15,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 23:02:15,750 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 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 36 [2021-05-02 23:02:15,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:15,751 INFO L225 Difference]: With dead ends: 85 [2021-05-02 23:02:15,751 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 23:02:15,752 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 41.2ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 23:02:15,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 23:02:15,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2021-05-02 23:02:15,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 37 states have (on average 1.162162162162162) internal successors, (43), 37 states have internal predecessors, (43), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:02:15,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2021-05-02 23:02:15,758 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2021-05-02 23:02:15,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:15,758 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2021-05-02 23:02:15,758 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 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 23:02:15,759 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2021-05-02 23:02:15,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 23:02:15,759 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:15,759 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:15,760 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 23:02:15,760 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:15,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:15,760 INFO L82 PathProgramCache]: Analyzing trace with hash 173558265, now seen corresponding path program 4 times [2021-05-02 23:02:15,761 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:15,761 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [79464274] [2021-05-02 23:02:15,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:15,766 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:15,767 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:15,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:15,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 23:02:15,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 23:02:15,847 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 23:02:15,847 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-02 23:02:15,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [79464274] [2021-05-02 23:02:15,847 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [79464274] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 23:02:15,848 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 23:02:15,848 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-02 23:02:15,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489966767] [2021-05-02 23:02:15,848 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 23:02:15,848 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-02 23:02:15,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 23:02:15,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:02:15,849 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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 23:02:15,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 23:02:15,978 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2021-05-02 23:02:15,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 23:02:15,979 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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 40 [2021-05-02 23:02:15,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 23:02:15,982 INFO L225 Difference]: With dead ends: 93 [2021-05-02 23:02:15,982 INFO L226 Difference]: Without dead ends: 66 [2021-05-02 23:02:15,983 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 38.7ms TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 23:02:15,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-05-02 23:02:15,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2021-05-02 23:02:15,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.146341463414634) internal successors, (47), 41 states have internal predecessors, (47), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 23:02:16,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2021-05-02 23:02:16,002 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2021-05-02 23:02:16,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 23:02:16,002 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2021-05-02 23:02:16,002 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 7 states have internal predecessors, (30), 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 23:02:16,003 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2021-05-02 23:02:16,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 23:02:16,005 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 23:02:16,005 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 23:02:16,005 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-02 23:02:16,006 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 23:02:16,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 23:02:16,007 INFO L82 PathProgramCache]: Analyzing trace with hash -1461422279, now seen corresponding path program 5 times [2021-05-02 23:02:16,007 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-02 23:02:16,008 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1678358695] [2021-05-02 23:02:16,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 23:02:16,014 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONINTEGER_UPDATE [2021-05-02 23:02:16,016 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-02 23:02:16,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 23:02:16,073 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 23:02:16,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 23:02:16,112 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 23:02:16,146 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-05-02 23:02:16,146 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 23:02:16,147 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-02 23:02:16,164 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 11:02:16 BoogieIcfgContainer [2021-05-02 23:02:16,164 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 23:02:16,165 INFO L168 Benchmark]: Toolchain (without parser) took 2595.88 ms. Allocated memory is still 211.8 MB. Free memory was 176.3 MB in the beginning and 113.4 MB in the end (delta: 62.9 MB). Peak memory consumption was 63.9 MB. Max. memory is 8.0 GB. [2021-05-02 23:02:16,166 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 211.8 MB. Free memory is still 193.0 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 23:02:16,166 INFO L168 Benchmark]: CACSL2BoogieTranslator took 298.52 ms. Allocated memory is still 211.8 MB. Free memory was 176.1 MB in the beginning and 194.0 MB in the end (delta: -17.9 MB). Peak memory consumption was 12.0 MB. Max. memory is 8.0 GB. [2021-05-02 23:02:16,170 INFO L168 Benchmark]: Boogie Preprocessor took 50.48 ms. Allocated memory is still 211.8 MB. Free memory was 194.0 MB in the beginning and 192.2 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 23:02:16,171 INFO L168 Benchmark]: RCFGBuilder took 456.30 ms. Allocated memory is still 211.8 MB. Free memory was 192.2 MB in the beginning and 172.7 MB in the end (delta: 19.5 MB). Peak memory consumption was 18.9 MB. Max. memory is 8.0 GB. [2021-05-02 23:02:16,172 INFO L168 Benchmark]: TraceAbstraction took 1785.75 ms. Allocated memory is still 211.8 MB. Free memory was 172.2 MB in the beginning and 113.4 MB in the end (delta: 58.9 MB). Peak memory consumption was 59.2 MB. Max. memory is 8.0 GB. [2021-05-02 23:02:16,177 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 211.8 MB. Free memory is still 193.0 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 298.52 ms. Allocated memory is still 211.8 MB. Free memory was 176.1 MB in the beginning and 194.0 MB in the end (delta: -17.9 MB). Peak memory consumption was 12.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 50.48 ms. Allocated memory is still 211.8 MB. Free memory was 194.0 MB in the beginning and 192.2 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 456.30 ms. Allocated memory is still 211.8 MB. Free memory was 192.2 MB in the beginning and 172.7 MB in the end (delta: 19.5 MB). Peak memory consumption was 18.9 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1785.75 ms. Allocated memory is still 211.8 MB. Free memory was 172.2 MB in the beginning and 113.4 MB in the end (delta: 58.9 MB). Peak memory consumption was 59.2 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 20]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of shiftLeft at line 69. Possible FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] COND FALSE !((inc_B-1)<