/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-36cd7be [2021-02-23 18:48:15,214 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-23 18:48:15,218 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-23 18:48:15,259 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-23 18:48:15,271 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-23 18:48:15,272 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-23 18:48:15,274 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-23 18:48:15,275 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-23 18:48:15,276 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-23 18:48:15,277 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-23 18:48:15,279 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-23 18:48:15,281 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-23 18:48:15,283 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-23 18:48:15,286 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-23 18:48:15,302 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-23 18:48:15,306 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-23 18:48:15,314 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-23 18:48:15,324 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-23 18:48:15,326 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-23 18:48:15,326 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-23 18:48:15,331 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2021-02-23 18:48:15,343 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-23 18:48:15,344 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-23 18:48:15,345 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-23 18:48:15,346 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-23 18:48:15,346 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-23 18:48:15,346 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-23 18:48:15,346 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-23 18:48:15,347 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-23 18:48:15,347 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-23 18:48:15,347 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-23 18:48:15,348 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-23 18:48:15,348 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-23 18:48:15,348 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-23 18:48:15,348 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-23 18:48:15,349 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-23 18:48:15,349 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-23 18:48:15,349 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-23 18:48:15,349 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-23 18:48:15,350 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-23 18:48:15,350 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-23 18:48:15,350 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-23 18:48:15,350 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-23 18:48:15,351 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-23 18:48:15,693 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-23 18:48:15,728 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-23 18:48:15,732 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-23 18:48:15,733 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-23 18:48:15,734 INFO L275 PluginConnector]: CDTParser initialized [2021-02-23 18:48:15,735 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i [2021-02-23 18:48:15,831 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a257c740/585b50a5966e4e8899daf5d48a12fae0/FLAG864af7691 [2021-02-23 18:48:16,435 INFO L306 CDTParser]: Found 1 translation units. [2021-02-23 18:48:16,435 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i [2021-02-23 18:48:16,442 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a257c740/585b50a5966e4e8899daf5d48a12fae0/FLAG864af7691 [2021-02-23 18:48:16,812 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9a257c740/585b50a5966e4e8899daf5d48a12fae0 [2021-02-23 18:48:16,815 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-23 18:48:16,829 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-23 18:48:16,833 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-23 18:48:16,833 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-23 18:48:16,837 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-23 18:48:16,838 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 06:48:16" (1/1) ... [2021-02-23 18:48:16,839 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@14227f20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:16, skipping insertion in model container [2021-02-23 18:48:16,839 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 06:48:16" (1/1) ... [2021-02-23 18:48:16,848 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-23 18:48:16,864 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-23 18:48:17,008 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i[834,847] [2021-02-23 18:48:17,019 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 18:48:17,029 INFO L203 MainTranslator]: Completed pre-run [2021-02-23 18:48:17,043 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i[834,847] [2021-02-23 18:48:17,047 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 18:48:17,064 INFO L208 MainTranslator]: Completed translation [2021-02-23 18:48:17,065 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:17 WrapperNode [2021-02-23 18:48:17,065 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-23 18:48:17,066 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-23 18:48:17,066 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-23 18:48:17,066 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-23 18:48:17,080 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:17" (1/1) ... [2021-02-23 18:48:17,080 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:17" (1/1) ... [2021-02-23 18:48:17,088 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:17" (1/1) ... [2021-02-23 18:48:17,089 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:17" (1/1) ... [2021-02-23 18:48:17,094 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:17" (1/1) ... [2021-02-23 18:48:17,099 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:17" (1/1) ... [2021-02-23 18:48:17,100 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:17" (1/1) ... [2021-02-23 18:48:17,103 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-23 18:48:17,104 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-23 18:48:17,104 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-23 18:48:17,104 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-23 18:48:17,105 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:17" (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 [2021-02-23 18:48:17,210 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-23 18:48:17,210 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-23 18:48:17,211 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-23 18:48:17,211 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-02-23 18:48:17,211 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-23 18:48:17,211 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-23 18:48:17,211 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-23 18:48:17,212 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-02-23 18:48:17,212 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-02-23 18:48:17,212 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-23 18:48:17,212 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-23 18:48:17,212 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-02-23 18:48:17,213 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-02-23 18:48:17,213 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-23 18:48:17,213 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-23 18:48:17,213 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-23 18:48:17,213 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-23 18:48:17,213 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-23 18:48:17,214 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-23 18:48:17,214 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-23 18:48:17,642 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-23 18:48:17,643 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-02-23 18:48:17,644 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 06:48:17 BoogieIcfgContainer [2021-02-23 18:48:17,645 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-23 18:48:17,647 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-23 18:48:17,647 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-23 18:48:17,651 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-23 18:48:17,651 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.02 06:48:16" (1/3) ... [2021-02-23 18:48:17,652 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1448ca50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 06:48:17, skipping insertion in model container [2021-02-23 18:48:17,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:48:17" (2/3) ... [2021-02-23 18:48:17,653 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1448ca50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 06:48:17, skipping insertion in model container [2021-02-23 18:48:17,653 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 06:48:17" (3/3) ... [2021-02-23 18:48:17,655 INFO L111 eAbstractionObserver]: Analyzing ICFG sum01_bug02_sum01_bug02_base.case.i [2021-02-23 18:48:17,662 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-23 18:48:17,667 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-23 18:48:17,687 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-23 18:48:17,711 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-23 18:48:17,711 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-23 18:48:17,711 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-23 18:48:17,712 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-23 18:48:17,712 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-23 18:48:17,712 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-23 18:48:17,712 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-23 18:48:17,712 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-23 18:48:17,731 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2021-02-23 18:48:17,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-02-23 18:48:17,740 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:17,740 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:48:17,741 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:17,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:17,747 INFO L82 PathProgramCache]: Analyzing trace with hash -143449552, now seen corresponding path program 1 times [2021-02-23 18:48:17,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:17,757 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176886642] [2021-02-23 18:48:17,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:17,837 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:48:17,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:17,946 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:17,948 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:17,949 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:17,950 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:18,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:48:18,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:18,026 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:18,027 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:18,033 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:48:18,035 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176886642] [2021-02-23 18:48:18,036 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:48:18,037 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-02-23 18:48:18,037 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980193451] [2021-02-23 18:48:18,042 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-02-23 18:48:18,043 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:48:18,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-02-23 18:48:18,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-23 18:48:18,068 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 3 states. [2021-02-23 18:48:18,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:48:18,234 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2021-02-23 18:48:18,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-02-23 18:48:18,237 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2021-02-23 18:48:18,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:48:18,248 INFO L225 Difference]: With dead ends: 46 [2021-02-23 18:48:18,248 INFO L226 Difference]: Without dead ends: 28 [2021-02-23 18:48:18,253 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-02-23 18:48:18,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-02-23 18:48:18,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-02-23 18:48:18,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2021-02-23 18:48:18,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2021-02-23 18:48:18,325 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 21 [2021-02-23 18:48:18,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:48:18,325 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2021-02-23 18:48:18,325 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-02-23 18:48:18,326 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2021-02-23 18:48:18,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-02-23 18:48:18,328 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:18,328 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:48:18,328 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-23 18:48:18,328 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:18,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:18,330 INFO L82 PathProgramCache]: Analyzing trace with hash -157302367, now seen corresponding path program 1 times [2021-02-23 18:48:18,330 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:18,332 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1749669965] [2021-02-23 18:48:18,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:18,348 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:48:18,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:18,480 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:18,482 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:18,493 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:18,496 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-02-23 18:48:18,513 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:18,515 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-23 18:48:18,529 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:18,530 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-23 18:48:18,546 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:18,547 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:18,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:48:18,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:18,642 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:18,643 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:18,649 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:48:18,649 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1749669965] [2021-02-23 18:48:18,650 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:48:18,650 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-02-23 18:48:18,650 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303534765] [2021-02-23 18:48:18,651 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-23 18:48:18,652 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:48:18,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-23 18:48:18,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-02-23 18:48:18,653 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 6 states. [2021-02-23 18:48:19,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:48:19,029 INFO L93 Difference]: Finished difference Result 35 states and 36 transitions. [2021-02-23 18:48:19,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-02-23 18:48:19,031 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2021-02-23 18:48:19,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:48:19,032 INFO L225 Difference]: With dead ends: 35 [2021-02-23 18:48:19,032 INFO L226 Difference]: Without dead ends: 30 [2021-02-23 18:48:19,034 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-02-23 18:48:19,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-02-23 18:48:19,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2021-02-23 18:48:19,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2021-02-23 18:48:19,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2021-02-23 18:48:19,044 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 21 [2021-02-23 18:48:19,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:48:19,045 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2021-02-23 18:48:19,045 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-02-23 18:48:19,045 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2021-02-23 18:48:19,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-02-23 18:48:19,046 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:19,046 INFO L422 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] [2021-02-23 18:48:19,047 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-23 18:48:19,047 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:19,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:19,048 INFO L82 PathProgramCache]: Analyzing trace with hash 1837920541, now seen corresponding path program 1 times [2021-02-23 18:48:19,048 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:19,048 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [319345357] [2021-02-23 18:48:19,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:21,215 WARN L141 QuantifierPusher]: treesize reduction 67, result has 59.9 percent of original size [2021-02-23 18:48:21,246 WARN L147 QuantifierPusher]: treesize reduction 67, result has 59.9 percent of original size 100 [2021-02-23 18:48:23,332 WARN L141 QuantifierPusher]: treesize reduction 58, result has 64.4 percent of original size [2021-02-23 18:48:23,341 WARN L147 QuantifierPusher]: treesize reduction 58, result has 64.4 percent of original size 105 [2021-02-23 18:48:23,343 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-02-23 18:48:23,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:23,520 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:23,521 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:23,523 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:23,526 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 18:48:23,532 WARN L141 QuantifierPusher]: treesize reduction 5, result has 58.3 percent of original size [2021-02-23 18:48:23,534 WARN L147 QuantifierPusher]: treesize reduction 5, result has 58.3 percent of original size 7 [2021-02-23 18:48:23,560 WARN L141 QuantifierPusher]: treesize reduction 18, result has 53.8 percent of original size [2021-02-23 18:48:23,563 WARN L147 QuantifierPusher]: treesize reduction 18, result has 53.8 percent of original size 21 [2021-02-23 18:48:23,612 WARN L141 QuantifierPusher]: treesize reduction 24, result has 56.4 percent of original size [2021-02-23 18:48:23,615 WARN L147 QuantifierPusher]: treesize reduction 24, result has 56.4 percent of original size 31 [2021-02-23 18:48:23,656 WARN L141 QuantifierPusher]: treesize reduction 24, result has 48.9 percent of original size [2021-02-23 18:48:23,658 WARN L147 QuantifierPusher]: treesize reduction 24, result has 48.9 percent of original size 23 [2021-02-23 18:48:23,691 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:23,692 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-23 18:48:23,704 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:23,705 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-23 18:48:23,718 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:23,719 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:23,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:48:23,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:48:23,784 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:23,785 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:23,788 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:48:23,801 WARN L141 QuantifierPusher]: treesize reduction 3, result has 98.1 percent of original size [2021-02-23 18:48:23,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-02-23 18:48:23,808 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:23,809 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 10 [2021-02-23 18:48:23,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-02-23 18:48:23,818 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:23,824 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 26 [2021-02-23 18:48:23,837 WARN L147 QuantifierPusher]: treesize reduction 3, result has 98.1 percent of original size 157 [2021-02-23 18:48:23,842 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:23,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-02-23 18:48:23,846 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:23,849 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 189 [2021-02-23 18:48:23,852 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 190 [2021-02-23 18:48:24,009 WARN L202 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 93 [2021-02-23 18:48:24,168 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:24,169 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-02-23 18:48:24,172 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:24,176 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 189 [2021-02-23 18:48:24,181 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 248 [2021-02-23 18:48:24,407 WARN L202 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 34 [2021-02-23 18:48:24,412 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:24,416 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 64 [2021-02-23 18:48:24,638 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:24,640 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 62 [2021-02-23 18:48:24,860 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:24,862 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 65 [2021-02-23 18:48:25,070 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:25,074 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 71 [2021-02-23 18:48:27,520 WARN L202 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2021-02-23 18:48:27,523 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:27,526 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 68 [2021-02-23 18:48:27,944 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:27,945 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:48:27,945 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [319345357] [2021-02-23 18:48:27,946 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:48:27,946 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-02-23 18:48:27,946 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595240413] [2021-02-23 18:48:27,947 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-02-23 18:48:27,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:48:27,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-02-23 18:48:27,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=211, Unknown=1, NotChecked=0, Total=272 [2021-02-23 18:48:27,948 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 14 states. [2021-02-23 18:48:28,488 WARN L202 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 31 [2021-02-23 18:48:28,688 WARN L202 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 33 [2021-02-23 18:48:29,009 WARN L202 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2021-02-23 18:48:29,271 WARN L202 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-02-23 18:48:29,550 WARN L202 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-02-23 18:48:29,748 WARN L202 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2021-02-23 18:48:30,223 WARN L202 SmtUtils]: Spent 401.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 57 [2021-02-23 18:48:30,658 WARN L202 SmtUtils]: Spent 369.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 50 [2021-02-23 18:48:31,106 WARN L202 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2021-02-23 18:48:31,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:48:31,364 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2021-02-23 18:48:31,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-02-23 18:48:31,365 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2021-02-23 18:48:31,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:48:31,367 INFO L225 Difference]: With dead ends: 53 [2021-02-23 18:48:31,368 INFO L226 Difference]: Without dead ends: 38 [2021-02-23 18:48:31,370 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=156, Invalid=655, Unknown=1, NotChecked=0, Total=812 [2021-02-23 18:48:31,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-02-23 18:48:31,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2021-02-23 18:48:31,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2021-02-23 18:48:31,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-02-23 18:48:31,393 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 27 [2021-02-23 18:48:31,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:48:31,393 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-02-23 18:48:31,393 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2021-02-23 18:48:31,393 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-02-23 18:48:31,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-02-23 18:48:31,394 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:48:31,395 INFO L422 BasicCegarLoop]: trace histogram [2, 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] [2021-02-23 18:48:31,395 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-23 18:48:31,395 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:48:31,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:48:31,396 INFO L82 PathProgramCache]: Analyzing trace with hash -209521128, now seen corresponding path program 1 times [2021-02-23 18:48:31,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:48:31,396 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [146702015] [2021-02-23 18:48:31,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:48:31,535 WARN L202 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 37 [2021-02-23 18:48:31,539 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:48:31,542 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 52 [2021-02-23 18:48:33,658 WARN L141 QuantifierPusher]: treesize reduction 58, result has 64.4 percent of original size [2021-02-23 18:48:33,666 WARN L147 QuantifierPusher]: treesize reduction 58, result has 64.4 percent of original size 105 [2021-02-23 18:48:35,786 WARN L141 QuantifierPusher]: treesize reduction 67, result has 59.9 percent of original size [2021-02-23 18:48:35,792 WARN L147 QuantifierPusher]: treesize reduction 67, result has 59.9 percent of original size 100 [2021-02-23 18:48:35,793 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-02-23 18:48:37,997 WARN L202 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 72 [2021-02-23 18:48:38,001 WARN L141 QuantifierPusher]: treesize reduction 69, result has 60.8 percent of original size [2021-02-23 18:48:38,007 WARN L147 QuantifierPusher]: treesize reduction 69, result has 60.8 percent of original size 107 [2021-02-23 18:48:40,111 WARN L141 QuantifierPusher]: treesize reduction 64, result has 60.2 percent of original size [2021-02-23 18:48:40,118 WARN L147 QuantifierPusher]: treesize reduction 64, result has 60.2 percent of original size 97 [2021-02-23 18:48:40,119 INFO L206 tedInterpolationCore]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2021-02-23 18:48:40,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 18:48:40,145 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 18:48:40,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 18:48:40,180 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 18:48:40,204 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-23 18:48:40,204 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-23 18:48:40,205 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-02-23 18:48:40,220 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.02 06:48:40 BoogieIcfgContainer [2021-02-23 18:48:40,220 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-23 18:48:40,221 INFO L168 Benchmark]: Toolchain (without parser) took 23403.74 ms. Allocated memory was 152.0 MB in the beginning and 185.6 MB in the end (delta: 33.6 MB). Free memory was 128.2 MB in the beginning and 121.2 MB in the end (delta: 7.1 MB). Peak memory consumption was 42.0 MB. Max. memory is 8.0 GB. [2021-02-23 18:48:40,222 INFO L168 Benchmark]: CDTParser took 0.92 ms. Allocated memory is still 152.0 MB. Free memory is still 126.7 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-23 18:48:40,222 INFO L168 Benchmark]: CACSL2BoogieTranslator took 232.43 ms. Allocated memory is still 152.0 MB. Free memory was 127.1 MB in the beginning and 117.4 MB in the end (delta: 9.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-02-23 18:48:40,223 INFO L168 Benchmark]: Boogie Preprocessor took 36.68 ms. Allocated memory is still 152.0 MB. Free memory was 117.4 MB in the beginning and 115.9 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-02-23 18:48:40,224 INFO L168 Benchmark]: RCFGBuilder took 541.03 ms. Allocated memory is still 152.0 MB. Free memory was 115.9 MB in the beginning and 133.1 MB in the end (delta: -17.2 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2021-02-23 18:48:40,225 INFO L168 Benchmark]: TraceAbstraction took 22573.12 ms. Allocated memory was 152.0 MB in the beginning and 185.6 MB in the end (delta: 33.6 MB). Free memory was 132.6 MB in the beginning and 121.2 MB in the end (delta: 11.4 MB). Peak memory consumption was 46.5 MB. Max. memory is 8.0 GB. [2021-02-23 18:48:40,228 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.92 ms. Allocated memory is still 152.0 MB. Free memory is still 126.7 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 232.43 ms. Allocated memory is still 152.0 MB. Free memory was 127.1 MB in the beginning and 117.4 MB in the end (delta: 9.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 36.68 ms. Allocated memory is still 152.0 MB. Free memory was 117.4 MB in the beginning and 115.9 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 541.03 ms. Allocated memory is still 152.0 MB. Free memory was 115.9 MB in the beginning and 133.1 MB in the end (delta: -17.2 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 22573.12 ms. Allocated memory was 152.0 MB in the beginning and 185.6 MB in the end (delta: 33.6 MB). Free memory was 132.6 MB in the beginning and 121.2 MB in the end (delta: 11.4 MB). Peak memory consumption was 46.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L23] int i, n=__VERIFIER_nondet_uint(), sn=0; [L23] int i, n=__VERIFIER_nondet_uint(), sn=0; [L24] i=1 [L24] COND TRUE i<=n [L25] sn = sn + (2) [L26] COND FALSE !(i==4) [L24] i++ [L24] COND TRUE i<=n [L25] sn = sn + (2) [L26] COND TRUE i==4 [L26] sn=-10 [L24] i++ [L24] COND FALSE !(i<=n) [L28] CALL __VERIFIER_assert(sn==n*(2) || sn == 0) [L15] COND TRUE !(cond) [L16] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 40 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 22.4s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 4.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 80 SDtfs, 81 SDslu, 140 SDs, 0 SdLazy, 235 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 45 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 181 ImplicationChecksByTransitivity, 7.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=37occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 2 StatesRemovedByMinimization, 2 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 proved your program to be incorrect! Received shutdown request...