/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/nla-digbench-scaling/cohencu-ll_unwindbound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 12:23:00,946 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 12:23:00,948 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 12:23:00,978 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 12:23:01,001 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 12:23:01,002 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 12:23:01,003 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 12:23:01,004 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 12:23:01,006 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 12:23:01,006 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 12:23:01,007 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 12:23:01,008 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 12:23:01,009 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 12:23:01,010 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 12:23:01,010 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 12:23:01,011 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 12:23:01,012 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 12:23:01,017 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 12:23:01,017 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 12:23:01,018 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 12:23:01,019 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 12:23:01,025 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 12:23:01,025 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 12:23:01,026 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 12:23:01,026 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 12:23:01,026 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 12:23:01,026 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 12:23:01,026 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 12:23:01,026 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 12:23:01,027 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 12:23:01,027 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 12:23:01,027 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 12:23:01,027 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 12:23:01,027 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 12:23:01,027 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 12:23:01,027 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 12:23:01,027 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 12:23:01,027 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 12:23:01,028 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 12:23:01,028 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 12:23:01,028 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 12:23:01,028 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 12:23:01,028 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 12:23:01,028 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 12:23:01,028 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 12:23:01,240 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 12:23:01,256 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 12:23:01,258 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 12:23:01,259 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 12:23:01,260 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 12:23:01,261 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound5.c [2021-05-06 12:23:01,310 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9fb9d2312/8e2f80ada79242b98232d9e036718401/FLAG16f735971 [2021-05-06 12:23:01,854 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 12:23:01,855 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound5.c [2021-05-06 12:23:01,859 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9fb9d2312/8e2f80ada79242b98232d9e036718401/FLAG16f735971 [2021-05-06 12:23:02,335 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9fb9d2312/8e2f80ada79242b98232d9e036718401 [2021-05-06 12:23:02,337 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 12:23:02,338 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 12:23:02,341 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 12:23:02,341 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 12:23:02,343 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 12:23:02,343 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:23:02" (1/1) ... [2021-05-06 12:23:02,344 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@67ae69a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:23:02, skipping insertion in model container [2021-05-06 12:23:02,344 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 12:23:02" (1/1) ... [2021-05-06 12:23:02,348 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 12:23:02,359 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 12:23:02,434 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound5.c[596,609] [2021-05-06 12:23:02,445 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:23:02,450 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 12:23:02,457 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohencu-ll_unwindbound5.c[596,609] [2021-05-06 12:23:02,463 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 12:23:02,471 INFO L208 MainTranslator]: Completed translation [2021-05-06 12:23:02,471 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:23:02 WrapperNode [2021-05-06 12:23:02,471 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 12:23:02,472 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 12:23:02,472 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 12:23:02,472 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 12:23:02,509 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:23:02" (1/1) ... [2021-05-06 12:23:02,510 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:23:02" (1/1) ... [2021-05-06 12:23:02,514 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:23:02" (1/1) ... [2021-05-06 12:23:02,514 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:23:02" (1/1) ... [2021-05-06 12:23:02,517 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:23:02" (1/1) ... [2021-05-06 12:23:02,520 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:23:02" (1/1) ... [2021-05-06 12:23:02,520 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:23:02" (1/1) ... [2021-05-06 12:23:02,521 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 12:23:02,522 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 12:23:02,522 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 12:23:02,522 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 12:23:02,523 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:23:02" (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 [2021-05-06 12:23:02,572 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 12:23:02,572 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 12:23:02,572 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 12:23:02,572 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 12:23:02,572 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 12:23:02,572 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 12:23:02,572 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 12:23:02,572 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 12:23:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 12:23:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 12:23:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_short [2021-05-06 12:23:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 12:23:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 12:23:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 12:23:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 12:23:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 12:23:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 12:23:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 12:23:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 12:23:02,573 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 12:23:02,780 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 12:23:02,780 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 12:23:02,781 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:23:02 BoogieIcfgContainer [2021-05-06 12:23:02,781 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 12:23:02,782 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 12:23:02,782 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 12:23:02,784 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 12:23:02,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 12:23:02" (1/3) ... [2021-05-06 12:23:02,785 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14b22c6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:23:02, skipping insertion in model container [2021-05-06 12:23:02,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 12:23:02" (2/3) ... [2021-05-06 12:23:02,785 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@14b22c6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 12:23:02, skipping insertion in model container [2021-05-06 12:23:02,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 12:23:02" (3/3) ... [2021-05-06 12:23:02,786 INFO L111 eAbstractionObserver]: Analyzing ICFG cohencu-ll_unwindbound5.c [2021-05-06 12:23:02,789 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 12:23:02,791 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 12:23:02,817 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 12:23:02,829 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 12:23:02,829 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 12:23:02,829 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 12:23:02,829 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 12:23:02,830 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 12:23:02,830 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 12:23:02,830 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 12:23:02,830 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 12:23:02,844 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 12:23:02,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 12:23:02,854 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:23:02,854 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:23:02,854 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:23:02,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:23:02,858 INFO L82 PathProgramCache]: Analyzing trace with hash 1839589780, now seen corresponding path program 1 times [2021-05-06 12:23:02,866 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:23:02,866 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244626007] [2021-05-06 12:23:02,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:23:02,903 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:23:02,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:03,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:23:03,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:03,100 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:23:03,101 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:23:03,101 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244626007] [2021-05-06 12:23:03,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [244626007] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:23:03,102 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:23:03,102 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 12:23:03,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618046184] [2021-05-06 12:23:03,105 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 12:23:03,105 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:23:03,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 12:23:03,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:23:03,114 INFO L87 Difference]: Start difference. First operand has 31 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) 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) [2021-05-06 12:23:03,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:23:03,303 INFO L93 Difference]: Finished difference Result 57 states and 95 transitions. [2021-05-06 12:23:03,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 12:23:03,305 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 [2021-05-06 12:23:03,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:23:03,310 INFO L225 Difference]: With dead ends: 57 [2021-05-06 12:23:03,310 INFO L226 Difference]: Without dead ends: 27 [2021-05-06 12:23:03,315 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 62.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 12:23:03,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-05-06 12:23:03,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-05-06 12:23:03,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 12:23:03,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 37 transitions. [2021-05-06 12:23:03,358 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 37 transitions. Word has length 11 [2021-05-06 12:23:03,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:23:03,358 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 37 transitions. [2021-05-06 12:23:03,358 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) [2021-05-06 12:23:03,358 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 37 transitions. [2021-05-06 12:23:03,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 12:23:03,359 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:23:03,359 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:23:03,359 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 12:23:03,360 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:23:03,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:23:03,360 INFO L82 PathProgramCache]: Analyzing trace with hash 660459433, now seen corresponding path program 1 times [2021-05-06 12:23:03,360 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:23:03,361 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739679019] [2021-05-06 12:23:03,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:23:03,365 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:23:03,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:03,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:23:03,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:03,495 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:23:03,495 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:23:03,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739679019] [2021-05-06 12:23:03,495 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [739679019] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:23:03,495 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:23:03,495 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 12:23:03,495 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608656353] [2021-05-06 12:23:03,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 12:23:03,496 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:23:03,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 12:23:03,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 12:23:03,497 INFO L87 Difference]: Start difference. First operand 26 states and 37 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) [2021-05-06 12:23:03,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:23:03,752 INFO L93 Difference]: Finished difference Result 40 states and 56 transitions. [2021-05-06 12:23:03,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 12:23:03,753 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) Word has length 12 [2021-05-06 12:23:03,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:23:03,754 INFO L225 Difference]: With dead ends: 40 [2021-05-06 12:23:03,754 INFO L226 Difference]: Without dead ends: 28 [2021-05-06 12:23:03,755 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 104.0ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 12:23:03,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-06 12:23:03,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-06 12:23:03,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 12:23:03,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 39 transitions. [2021-05-06 12:23:03,760 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 39 transitions. Word has length 12 [2021-05-06 12:23:03,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:23:03,760 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 39 transitions. [2021-05-06 12:23:03,760 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 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) [2021-05-06 12:23:03,760 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 39 transitions. [2021-05-06 12:23:03,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 12:23:03,761 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:23:03,761 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:23:03,761 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 12:23:03,761 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:23:03,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:23:03,761 INFO L82 PathProgramCache]: Analyzing trace with hash 662008565, now seen corresponding path program 1 times [2021-05-06 12:23:03,761 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:23:03,762 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1133942081] [2021-05-06 12:23:03,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:23:03,763 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:23:03,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:03,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 12:23:03,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 12:23:03,929 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 12:23:03,929 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 12:23:03,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1133942081] [2021-05-06 12:23:03,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1133942081] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 12:23:03,930 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 12:23:03,930 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 12:23:03,930 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708469869] [2021-05-06 12:23:03,930 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 12:23:03,930 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 12:23:03,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 12:23:03,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 12:23:03,931 INFO L87 Difference]: Start difference. First operand 28 states and 39 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-05-06 12:23:04,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 12:23:04,294 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2021-05-06 12:23:04,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 12:23:04,295 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 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 12 [2021-05-06 12:23:04,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 12:23:04,295 INFO L225 Difference]: With dead ends: 34 [2021-05-06 12:23:04,295 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 12:23:04,296 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 245.1ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 12:23:04,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 12:23:04,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-06 12:23:04,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-06 12:23:04,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-06 12:23:04,318 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 12 [2021-05-06 12:23:04,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 12:23:04,318 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-06 12:23:04,318 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 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) [2021-05-06 12:23:04,318 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-06 12:23:04,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 12:23:04,319 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 12:23:04,319 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 12:23:04,319 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 12:23:04,319 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 12:23:04,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 12:23:04,320 INFO L82 PathProgramCache]: Analyzing trace with hash 2023221563, now seen corresponding path program 1 times [2021-05-06 12:23:04,320 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 12:23:04,320 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [940510048] [2021-05-06 12:23:04,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 12:23:04,322 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 12:23:04,335 WARN L167 FreeRefinementEngine]: Strategy FIXED_PREFERENCES was unsuccessful and could not determine trace feasibility [2021-05-06 12:23:04,336 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-06 12:23:04,338 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 12:23:04,346 WARN L227 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2021-05-06 12:23:04,346 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 12:23:04 BoogieIcfgContainer [2021-05-06 12:23:04,346 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 12:23:04,347 INFO L168 Benchmark]: Toolchain (without parser) took 2009.01 ms. Allocated memory is still 192.9 MB. Free memory was 158.8 MB in the beginning and 137.3 MB in the end (delta: 21.5 MB). Peak memory consumption was 20.8 MB. Max. memory is 8.0 GB. [2021-05-06 12:23:04,347 INFO L168 Benchmark]: CDTParser took 0.13 ms. Allocated memory is still 192.9 MB. Free memory is still 175.4 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 12:23:04,348 INFO L168 Benchmark]: CACSL2BoogieTranslator took 130.84 ms. Allocated memory is still 192.9 MB. Free memory was 158.5 MB in the beginning and 148.4 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-05-06 12:23:04,353 INFO L168 Benchmark]: Boogie Preprocessor took 49.44 ms. Allocated memory is still 192.9 MB. Free memory was 148.3 MB in the beginning and 176.0 MB in the end (delta: -27.6 MB). Peak memory consumption was 4.1 MB. Max. memory is 8.0 GB. [2021-05-06 12:23:04,354 INFO L168 Benchmark]: RCFGBuilder took 259.52 ms. Allocated memory is still 192.9 MB. Free memory was 176.0 MB in the beginning and 159.7 MB in the end (delta: 16.3 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. [2021-05-06 12:23:04,354 INFO L168 Benchmark]: TraceAbstraction took 1564.14 ms. Allocated memory is still 192.9 MB. Free memory was 159.2 MB in the beginning and 137.3 MB in the end (delta: 21.9 MB). Peak memory consumption was 21.9 MB. Max. memory is 8.0 GB. [2021-05-06 12:23:04,355 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13 ms. Allocated memory is still 192.9 MB. Free memory is still 175.4 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 130.84 ms. Allocated memory is still 192.9 MB. Free memory was 158.5 MB in the beginning and 148.4 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 49.44 ms. Allocated memory is still 192.9 MB. Free memory was 148.3 MB in the beginning and 176.0 MB in the end (delta: -27.6 MB). Peak memory consumption was 4.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 259.52 ms. Allocated memory is still 192.9 MB. Free memory was 176.0 MB in the beginning and 159.7 MB in the end (delta: 16.3 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1564.14 ms. Allocated memory is still 192.9 MB. Free memory was 159.2 MB in the beginning and 137.3 MB in the end (delta: 21.9 MB). Peak memory consumption was 21.9 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 17]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L22] int counter = 0; [L24] short a; [L25] long long n, x, y, z; [L26] a = __VERIFIER_nondet_unsigned_short() [L28] n = 0 [L29] x = 0 [L30] y = 1 [L31] z = 6 [L33] EXPR counter++ [L33] COND TRUE counter++<5 [L34] CALL __VERIFIER_assert(z == 6 * n + 6) [L15] COND FALSE !(!(cond)) [L34] RET __VERIFIER_assert(z == 6 * n + 6) [L35] CALL __VERIFIER_assert(y == 3 * n * n + 3 * n + 1) [L15] COND TRUE !(cond) [L17] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 38 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNKNOWN, OverallTime: 1510.9ms, OverallIterations: 4, TraceHistogramMax: 2, EmptinessCheckTime: 14.9ms, AutomataDifference: 832.2ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 10.3ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 103 SDtfs, 29 SDslu, 103 SDs, 0 SdLazy, 129 SolverSat, 39 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 409.4ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 22 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 411.5ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=32occurred in iteration=3, InterpolantAutomatonStates: 17, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 60.1ms AutomataMinimizationTime, 3 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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 RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...