/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 --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-24 02:25:21,860 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-24 02:25:21,864 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-24 02:25:21,914 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-24 02:25:21,915 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-24 02:25:21,919 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-24 02:25:21,922 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-24 02:25:21,929 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-24 02:25:21,942 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-24 02:25:21,950 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-24 02:25:21,951 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-24 02:25:21,953 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-24 02:25:21,953 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-24 02:25:21,956 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-24 02:25:21,958 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-24 02:25:21,960 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-24 02:25:21,961 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-24 02:25:21,964 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-24 02:25:21,969 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-24 02:25:21,973 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-24 02:25:21,974 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-24 02:25:21,976 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-24 02:25:21,977 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-24 02:25:21,979 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-24 02:25:21,989 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-24 02:25:21,989 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-24 02:25:21,989 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-24 02:25:21,993 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-24 02:25:21,993 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-24 02:25:21,994 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-24 02:25:21,995 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-24 02:25:21,996 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-24 02:25:21,998 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-24 02:25:21,999 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-24 02:25:22,000 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-24 02:25:22,000 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-24 02:25:22,001 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-24 02:25:22,001 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-24 02:25:22,001 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-24 02:25:22,002 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-24 02:25:22,003 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-24 02:25:22,004 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-24 02:25:22,025 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-24 02:25:22,026 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-24 02:25:22,030 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-24 02:25:22,030 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-24 02:25:22,031 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-24 02:25:22,031 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-24 02:25:22,031 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-24 02:25:22,031 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-24 02:25:22,031 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-24 02:25:22,032 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-24 02:25:22,032 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-24 02:25:22,033 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-24 02:25:22,033 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-24 02:25:22,033 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-24 02:25:22,034 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-24 02:25:22,034 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-24 02:25:22,034 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-24 02:25:22,034 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-24 02:25:22,034 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-24 02:25:22,035 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-24 02:25:22,035 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-24 02:25:22,035 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-24 02:25:22,035 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-10-24 02:25:22,460 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-24 02:25:22,493 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-24 02:25:22,497 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-24 02:25:22,499 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-24 02:25:22,500 INFO L275 PluginConnector]: CDTParser initialized [2020-10-24 02:25:22,501 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-10-24 02:25:22,582 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23e02e7d8/6324fedc5dd24cada57ca4c412e5a8c3/FLAG463cb6f8e [2020-10-24 02:25:23,218 INFO L306 CDTParser]: Found 1 translation units. [2020-10-24 02:25:23,219 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-10-24 02:25:23,225 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23e02e7d8/6324fedc5dd24cada57ca4c412e5a8c3/FLAG463cb6f8e [2020-10-24 02:25:23,597 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23e02e7d8/6324fedc5dd24cada57ca4c412e5a8c3 [2020-10-24 02:25:23,599 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-24 02:25:23,607 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-24 02:25:23,612 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-24 02:25:23,612 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-24 02:25:23,616 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-24 02:25:23,616 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 02:25:23" (1/1) ... [2020-10-24 02:25:23,620 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ff699de and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:25:23, skipping insertion in model container [2020-10-24 02:25:23,621 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.10 02:25:23" (1/1) ... [2020-10-24 02:25:23,630 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-24 02:25:23,648 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-24 02:25:23,886 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-24 02:25:23,903 INFO L203 MainTranslator]: Completed pre-run [2020-10-24 02:25:23,920 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-24 02:25:23,937 INFO L208 MainTranslator]: Completed translation [2020-10-24 02:25:23,938 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:25:23 WrapperNode [2020-10-24 02:25:23,938 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-24 02:25:23,940 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-24 02:25:23,940 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-24 02:25:23,940 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-24 02:25:23,954 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:25:23" (1/1) ... [2020-10-24 02:25:23,954 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:25:23" (1/1) ... [2020-10-24 02:25:23,963 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:25:23" (1/1) ... [2020-10-24 02:25:23,963 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:25:23" (1/1) ... [2020-10-24 02:25:23,970 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:25:23" (1/1) ... [2020-10-24 02:25:23,978 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:25:23" (1/1) ... [2020-10-24 02:25:23,985 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:25:23" (1/1) ... [2020-10-24 02:25:23,988 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-24 02:25:23,990 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-24 02:25:23,990 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-24 02:25:23,990 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-24 02:25:23,993 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:25:23" (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 [2020-10-24 02:25:24,069 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-24 02:25:24,069 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-24 02:25:24,069 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-24 02:25:24,070 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-24 02:25:24,070 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-24 02:25:24,070 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-24 02:25:24,070 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-24 02:25:24,070 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-24 02:25:24,071 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-24 02:25:24,071 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-24 02:25:24,071 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-24 02:25:24,071 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-24 02:25:24,071 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-24 02:25:24,071 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-24 02:25:24,072 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-24 02:25:24,072 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-24 02:25:24,072 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-24 02:25:24,307 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-24 02:25:24,307 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-24 02:25:24,309 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 02:25:24 BoogieIcfgContainer [2020-10-24 02:25:24,309 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-24 02:25:24,311 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-24 02:25:24,311 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-24 02:25:24,320 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-24 02:25:24,320 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.10 02:25:23" (1/3) ... [2020-10-24 02:25:24,325 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f047126 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 02:25:24, skipping insertion in model container [2020-10-24 02:25:24,325 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.10 02:25:23" (2/3) ... [2020-10-24 02:25:24,326 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f047126 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.10 02:25:24, skipping insertion in model container [2020-10-24 02:25:24,329 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.10 02:25:24" (3/3) ... [2020-10-24 02:25:24,334 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-10-24 02:25:24,371 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-24 02:25:24,381 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-24 02:25:24,413 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-24 02:25:24,465 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-24 02:25:24,465 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-24 02:25:24,465 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-24 02:25:24,465 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-24 02:25:24,465 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-24 02:25:24,465 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-24 02:25:24,466 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-24 02:25:24,466 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-24 02:25:24,499 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states. [2020-10-24 02:25:24,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-24 02:25:24,508 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:25:24,508 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] [2020-10-24 02:25:24,509 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:25:24,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:25:24,516 INFO L82 PathProgramCache]: Analyzing trace with hash -772490682, now seen corresponding path program 1 times [2020-10-24 02:25:24,527 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:25:24,528 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1685548877] [2020-10-24 02:25:24,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:25:24,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:25:24,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:25:24,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:25:24,825 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 02:25:24,826 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1685548877] [2020-10-24 02:25:24,828 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-24 02:25:24,829 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-24 02:25:24,829 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313752435] [2020-10-24 02:25:24,834 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-24 02:25:24,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:25:24,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-24 02:25:24,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-24 02:25:24,853 INFO L87 Difference]: Start difference. First operand 34 states. Second operand 4 states. [2020-10-24 02:25:25,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:25:25,007 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2020-10-24 02:25:25,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-24 02:25:25,009 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-10-24 02:25:25,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:25:25,017 INFO L225 Difference]: With dead ends: 49 [2020-10-24 02:25:25,017 INFO L226 Difference]: Without dead ends: 28 [2020-10-24 02:25:25,020 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-10-24 02:25:25,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-10-24 02:25:25,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-10-24 02:25:25,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-24 02:25:25,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-10-24 02:25:25,078 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 20 [2020-10-24 02:25:25,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:25:25,078 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-10-24 02:25:25,078 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-24 02:25:25,079 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-10-24 02:25:25,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-24 02:25:25,080 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:25:25,080 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] [2020-10-24 02:25:25,080 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-24 02:25:25,081 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:25:25,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:25:25,082 INFO L82 PathProgramCache]: Analyzing trace with hash 515607529, now seen corresponding path program 1 times [2020-10-24 02:25:25,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:25:25,082 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049576975] [2020-10-24 02:25:25,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:25:25,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:25:25,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:25:25,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:25:25,273 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 02:25:25,274 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049576975] [2020-10-24 02:25:25,278 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 02:25:25,278 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-24 02:25:25,278 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564930476] [2020-10-24 02:25:25,280 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-24 02:25:25,280 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:25:25,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-24 02:25:25,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-10-24 02:25:25,282 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 6 states. [2020-10-24 02:25:25,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:25:25,523 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-10-24 02:25:25,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-24 02:25:25,523 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2020-10-24 02:25:25,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:25:25,525 INFO L225 Difference]: With dead ends: 39 [2020-10-24 02:25:25,525 INFO L226 Difference]: Without dead ends: 33 [2020-10-24 02:25:25,526 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2020-10-24 02:25:25,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-10-24 02:25:25,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2020-10-24 02:25:25,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-10-24 02:25:25,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-10-24 02:25:25,538 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 25 [2020-10-24 02:25:25,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:25:25,539 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-10-24 02:25:25,539 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-24 02:25:25,539 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-10-24 02:25:25,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-10-24 02:25:25,540 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:25:25,540 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] [2020-10-24 02:25:25,541 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-24 02:25:25,541 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:25:25,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:25:25,542 INFO L82 PathProgramCache]: Analyzing trace with hash -1732949978, now seen corresponding path program 2 times [2020-10-24 02:25:25,544 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:25:25,545 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596116376] [2020-10-24 02:25:25,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:25:25,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:25:25,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:25:25,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:25:25,819 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 02:25:25,820 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596116376] [2020-10-24 02:25:25,820 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 02:25:25,821 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-24 02:25:25,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251666901] [2020-10-24 02:25:25,822 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-24 02:25:25,822 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:25:25,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-24 02:25:25,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-10-24 02:25:25,823 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 8 states. [2020-10-24 02:25:26,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:25:26,193 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-10-24 02:25:26,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-24 02:25:26,194 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 30 [2020-10-24 02:25:26,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:25:26,196 INFO L225 Difference]: With dead ends: 44 [2020-10-24 02:25:26,196 INFO L226 Difference]: Without dead ends: 38 [2020-10-24 02:25:26,197 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=62, Invalid=148, Unknown=0, NotChecked=0, Total=210 [2020-10-24 02:25:26,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-10-24 02:25:26,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2020-10-24 02:25:26,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-10-24 02:25:26,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-10-24 02:25:26,209 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 30 [2020-10-24 02:25:26,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:25:26,210 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-10-24 02:25:26,210 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-24 02:25:26,210 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-10-24 02:25:26,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-10-24 02:25:26,211 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:25:26,212 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 02:25:26,212 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-24 02:25:26,212 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:25:26,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:25:26,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1450661367, now seen corresponding path program 3 times [2020-10-24 02:25:26,213 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:25:26,213 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1351430105] [2020-10-24 02:25:26,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:25:26,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:25:26,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:25:26,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:25:26,448 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 02:25:26,449 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1351430105] [2020-10-24 02:25:26,449 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 02:25:26,449 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-10-24 02:25:26,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [82449310] [2020-10-24 02:25:26,450 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-10-24 02:25:26,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:25:26,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-10-24 02:25:26,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2020-10-24 02:25:26,452 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 10 states. [2020-10-24 02:25:26,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:25:26,922 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-10-24 02:25:26,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-24 02:25:26,922 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 35 [2020-10-24 02:25:26,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:25:26,924 INFO L225 Difference]: With dead ends: 49 [2020-10-24 02:25:26,924 INFO L226 Difference]: Without dead ends: 43 [2020-10-24 02:25:26,925 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2020-10-24 02:25:26,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-10-24 02:25:26,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 41. [2020-10-24 02:25:26,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-24 02:25:26,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-10-24 02:25:26,938 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 35 [2020-10-24 02:25:26,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:25:26,938 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-10-24 02:25:26,938 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-10-24 02:25:26,938 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-10-24 02:25:26,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-10-24 02:25:26,940 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:25:26,940 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 02:25:26,940 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-24 02:25:26,940 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:25:26,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:25:26,941 INFO L82 PathProgramCache]: Analyzing trace with hash 772144646, now seen corresponding path program 4 times [2020-10-24 02:25:26,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:25:26,941 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [277793658] [2020-10-24 02:25:26,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:25:26,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:25:27,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:25:27,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:25:27,157 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 02:25:27,157 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [277793658] [2020-10-24 02:25:27,157 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 02:25:27,158 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-10-24 02:25:27,158 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243220970] [2020-10-24 02:25:27,158 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-24 02:25:27,159 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:25:27,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-24 02:25:27,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2020-10-24 02:25:27,160 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 12 states. [2020-10-24 02:25:27,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:25:27,979 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-10-24 02:25:27,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-10-24 02:25:27,984 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-10-24 02:25:27,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:25:27,985 INFO L225 Difference]: With dead ends: 54 [2020-10-24 02:25:27,985 INFO L226 Difference]: Without dead ends: 48 [2020-10-24 02:25:27,989 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=116, Invalid=484, Unknown=0, NotChecked=0, Total=600 [2020-10-24 02:25:27,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-24 02:25:28,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-10-24 02:25:28,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-10-24 02:25:28,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-10-24 02:25:28,012 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 40 [2020-10-24 02:25:28,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:25:28,015 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-10-24 02:25:28,015 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-24 02:25:28,015 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-10-24 02:25:28,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-10-24 02:25:28,016 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:25:28,017 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 02:25:28,017 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-24 02:25:28,018 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:25:28,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:25:28,018 INFO L82 PathProgramCache]: Analyzing trace with hash 1100914729, now seen corresponding path program 5 times [2020-10-24 02:25:28,019 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:25:28,020 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [160427949] [2020-10-24 02:25:28,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:25:28,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:25:28,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-24 02:25:28,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-24 02:25:28,306 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-24 02:25:28,307 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [160427949] [2020-10-24 02:25:28,307 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-24 02:25:28,307 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-10-24 02:25:28,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159431884] [2020-10-24 02:25:28,308 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-24 02:25:28,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-24 02:25:28,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-24 02:25:28,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2020-10-24 02:25:28,309 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 14 states. [2020-10-24 02:25:29,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-24 02:25:29,406 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-10-24 02:25:29,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-10-24 02:25:29,406 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 45 [2020-10-24 02:25:29,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-24 02:25:29,407 INFO L225 Difference]: With dead ends: 59 [2020-10-24 02:25:29,408 INFO L226 Difference]: Without dead ends: 53 [2020-10-24 02:25:29,408 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2020-10-24 02:25:29,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-10-24 02:25:29,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 51. [2020-10-24 02:25:29,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-10-24 02:25:29,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-10-24 02:25:29,424 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 45 [2020-10-24 02:25:29,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-24 02:25:29,424 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-10-24 02:25:29,424 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-24 02:25:29,424 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-10-24 02:25:29,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-10-24 02:25:29,425 INFO L414 BasicCegarLoop]: Found error trace [2020-10-24 02:25:29,426 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-24 02:25:29,426 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-24 02:25:29,426 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-24 02:25:29,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-24 02:25:29,426 INFO L82 PathProgramCache]: Analyzing trace with hash 1507122150, now seen corresponding path program 6 times [2020-10-24 02:25:29,427 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-24 02:25:29,427 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [815276495] [2020-10-24 02:25:29,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-24 02:25:29,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-24 02:25:29,472 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-24 02:25:29,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-24 02:25:29,501 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-24 02:25:29,535 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-24 02:25:29,536 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-24 02:25:29,536 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-24 02:25:29,608 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.10 02:25:29 BoogieIcfgContainer [2020-10-24 02:25:29,609 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-24 02:25:29,611 INFO L168 Benchmark]: Toolchain (without parser) took 6008.72 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 128.4 MB in the beginning and 193.8 MB in the end (delta: -65.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-24 02:25:29,612 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 125.8 MB. Free memory was 98.9 MB in the beginning and 98.9 MB in the end (delta: 70.8 kB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-24 02:25:29,613 INFO L168 Benchmark]: CACSL2BoogieTranslator took 327.04 ms. Allocated memory is still 151.0 MB. Free memory was 127.8 MB in the beginning and 118.7 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-24 02:25:29,614 INFO L168 Benchmark]: Boogie Preprocessor took 48.21 ms. Allocated memory is still 151.0 MB. Free memory was 118.7 MB in the beginning and 117.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-24 02:25:29,615 INFO L168 Benchmark]: RCFGBuilder took 319.30 ms. Allocated memory is still 151.0 MB. Free memory was 117.2 MB in the beginning and 131.3 MB in the end (delta: -14.0 MB). Peak memory consumption was 12.8 MB. Max. memory is 8.0 GB. [2020-10-24 02:25:29,616 INFO L168 Benchmark]: TraceAbstraction took 5298.06 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 130.9 MB in the beginning and 193.8 MB in the end (delta: -62.9 MB). Peak memory consumption was 3.9 MB. Max. memory is 8.0 GB. [2020-10-24 02:25:29,620 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 125.8 MB. Free memory was 98.9 MB in the beginning and 98.9 MB in the end (delta: 70.8 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 327.04 ms. Allocated memory is still 151.0 MB. Free memory was 127.8 MB in the beginning and 118.7 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 48.21 ms. Allocated memory is still 151.0 MB. Free memory was 118.7 MB in the beginning and 117.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 319.30 ms. Allocated memory is still 151.0 MB. Free memory was 117.2 MB in the beginning and 131.3 MB in the end (delta: -14.0 MB). Peak memory consumption was 12.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 5298.06 ms. Allocated memory was 151.0 MB in the beginning and 218.1 MB in the end (delta: 67.1 MB). Free memory was 130.9 MB in the beginning and 193.8 MB in the end (delta: -62.9 MB). Peak memory consumption was 3.9 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L13] unsigned int x = 0; VAL [x=0] [L14] unsigned int y = 1; VAL [x=0, y=1] [L16] COND TRUE x < 6 VAL [x=0, y=1] [L17] x++ VAL [x=1, y=1] [L18] y *= 2 VAL [x=1, y=2] [L16] COND TRUE x < 6 VAL [x=1, y=2] [L17] x++ VAL [x=2, y=2] [L18] y *= 2 VAL [x=2, y=4] [L16] COND TRUE x < 6 VAL [x=2, y=4] [L17] x++ VAL [x=3, y=4] [L18] y *= 2 VAL [x=3, y=8] [L16] COND TRUE x < 6 VAL [x=3, y=8] [L17] x++ VAL [x=4, y=8] [L18] y *= 2 VAL [x=4, y=16] [L16] COND TRUE x < 6 VAL [x=4, y=16] [L17] x++ VAL [x=5, y=16] [L18] y *= 2 VAL [x=5, y=32] [L16] COND TRUE x < 6 VAL [x=5, y=32] [L17] x++ VAL [x=6, y=32] [L18] y *= 2 VAL [x=6, y=64] [L16] COND FALSE !(x < 6) VAL [x=6, y=64] [L21] CALL __VERIFIER_assert(y != 64) VAL [\old(cond)=0] [L6] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L7] CALL reach_error() [L3] __assert_fail("0", "underapprox_1-1.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.0s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 3.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 154 SDtfs, 198 SDslu, 469 SDs, 0 SdLazy, 740 SolverSat, 63 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 111 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 2.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=51occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 6 MinimizatonAttempts, 12 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.1s InterpolantComputationTime, 245 NumberOfCodeBlocks, 245 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 189 ConstructedInterpolants, 0 QuantifiedInterpolants, 30297 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 1 PerfectInterpolantSequences, 0/115 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...