/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 11:26:52,470 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 11:26:52,472 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 11:26:52,502 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 11:26:52,502 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 11:26:52,504 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 11:26:52,506 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 11:26:52,510 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 11:26:52,511 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 11:26:52,514 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 11:26:52,515 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 11:26:52,516 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 11:26:52,516 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 11:26:52,517 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 11:26:52,518 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 11:26:52,520 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 11:26:52,522 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 11:26:52,522 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 11:26:52,524 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 11:26:52,528 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 11:26:52,529 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 11:26:52,531 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 11:26:52,531 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 11:26:52,533 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 11:26:52,538 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-06 11:26:52,539 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-06 11:26:52,539 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-06 11:26:52,540 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-06 11:26:52,540 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-06 11:26:52,541 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-06 11:26:52,541 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-06 11:26:52,542 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-06 11:26:52,543 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-06 11:26:52,544 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-06 11:26:52,544 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-06 11:26:52,545 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-06 11:26:52,545 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-06 11:26:52,545 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-06 11:26:52,545 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 11:26:52,546 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 11:26:52,546 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 11:26:52,550 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-06 11:26:52,561 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 11:26:52,561 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 11:26:52,563 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 11:26:52,563 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 11:26:52,563 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 11:26:52,563 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 11:26:52,563 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 11:26:52,563 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 11:26:52,564 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 11:26:52,564 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 11:26:52,564 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 11:26:52,564 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 11:26:52,564 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 11:26:52,565 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 11:26:52,565 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 11:26:52,565 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 11:26:52,565 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 11:26:52,565 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 11:26:52,565 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:26:52,565 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 11:26:52,565 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-06 11:26:52,565 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 11:26:52,565 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-06 11:26:52,566 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 11:26:52,828 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 11:26:52,844 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 11:26:52,846 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 11:26:52,847 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 11:26:52,847 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 11:26:52,848 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2021-05-06 11:26:52,887 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d7638739/8660da1632fe4cf8af07ad11a9395337/FLAG41a6553b2 [2021-05-06 11:26:53,188 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 11:26:53,188 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2021-05-06 11:26:53,192 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d7638739/8660da1632fe4cf8af07ad11a9395337/FLAG41a6553b2 [2021-05-06 11:26:53,637 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9d7638739/8660da1632fe4cf8af07ad11a9395337 [2021-05-06 11:26:53,639 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 11:26:53,641 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 11:26:53,645 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 11:26:53,645 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 11:26:53,647 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 11:26:53,648 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:26:53" (1/1) ... [2021-05-06 11:26:53,649 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2bc0d460 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:26:53, skipping insertion in model container [2021-05-06 11:26:53,649 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 11:26:53" (1/1) ... [2021-05-06 11:26:53,656 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 11:26:53,665 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 11:26:53,742 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c[327,340] [2021-05-06 11:26:53,748 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:26:53,753 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 11:26:53,811 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c[327,340] [2021-05-06 11:26:53,813 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 11:26:53,824 INFO L208 MainTranslator]: Completed translation [2021-05-06 11:26:53,824 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:26:53 WrapperNode [2021-05-06 11:26:53,824 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 11:26:53,825 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 11:26:53,825 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 11:26:53,825 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 11:26:53,832 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:26:53" (1/1) ... [2021-05-06 11:26:53,833 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:26:53" (1/1) ... [2021-05-06 11:26:53,837 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:26:53" (1/1) ... [2021-05-06 11:26:53,837 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:26:53" (1/1) ... [2021-05-06 11:26:53,841 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:26:53" (1/1) ... [2021-05-06 11:26:53,845 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:26:53" (1/1) ... [2021-05-06 11:26:53,850 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:26:53" (1/1) ... [2021-05-06 11:26:53,851 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 11:26:53,853 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 11:26:53,853 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 11:26:53,853 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 11:26:53,854 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:26:53" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 11:26:53,910 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 11:26:53,910 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 11:26:53,911 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 11:26:53,911 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 11:26:53,911 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 11:26:53,911 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 11:26:53,911 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 11:26:53,911 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 11:26:53,911 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 11:26:53,911 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 11:26:53,912 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 11:26:53,912 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 11:26:53,912 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 11:26:53,912 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 11:26:53,912 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 11:26:53,912 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 11:26:53,912 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 11:26:54,067 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 11:26:54,068 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 11:26:54,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:26:54 BoogieIcfgContainer [2021-05-06 11:26:54,069 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 11:26:54,070 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 11:26:54,070 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 11:26:54,071 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 11:26:54,072 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 11:26:53" (1/3) ... [2021-05-06 11:26:54,072 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7cac1fff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:26:54, skipping insertion in model container [2021-05-06 11:26:54,072 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 11:26:53" (2/3) ... [2021-05-06 11:26:54,072 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7cac1fff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 11:26:54, skipping insertion in model container [2021-05-06 11:26:54,072 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 11:26:54" (3/3) ... [2021-05-06 11:26:54,073 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2021-05-06 11:26:54,077 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-06 11:26:54,079 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 11:26:54,089 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 11:26:54,102 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 11:26:54,102 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 11:26:54,102 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-06 11:26:54,102 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 11:26:54,102 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 11:26:54,102 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 11:26:54,102 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 11:26:54,102 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 11:26:54,112 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 11:26:54,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:26:54,116 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:54,117 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:54,117 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:54,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:54,120 INFO L82 PathProgramCache]: Analyzing trace with hash -219174432, now seen corresponding path program 1 times [2021-05-06 11:26:54,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:54,126 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2023698431] [2021-05-06 11:26:54,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:54,163 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:54,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:54,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:54,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:54,261 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:54,262 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:54,263 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2023698431] [2021-05-06 11:26:54,264 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2023698431] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:54,264 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:54,264 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 11:26:54,264 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476081979] [2021-05-06 11:26:54,267 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 11:26:54,267 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:54,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 11:26:54,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:26:54,276 INFO L87 Difference]: Start difference. First operand has 18 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:54,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:54,310 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2021-05-06 11:26:54,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 11:26:54,311 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:26:54,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:54,315 INFO L225 Difference]: With dead ends: 29 [2021-05-06 11:26:54,315 INFO L226 Difference]: Without dead ends: 12 [2021-05-06 11:26:54,317 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 26.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 11:26:54,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-05-06 11:26:54,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-05-06 11:26:54,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 7 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:54,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2021-05-06 11:26:54,338 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 11 [2021-05-06 11:26:54,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:54,339 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2021-05-06 11:26:54,339 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:54,339 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2021-05-06 11:26:54,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-06 11:26:54,339 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:54,339 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:54,340 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 11:26:54,340 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:54,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:54,340 INFO L82 PathProgramCache]: Analyzing trace with hash -222868516, now seen corresponding path program 1 times [2021-05-06 11:26:54,341 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:54,341 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [714260503] [2021-05-06 11:26:54,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:54,343 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:54,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:54,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:54,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:54,472 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:54,472 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:54,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [714260503] [2021-05-06 11:26:54,473 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [714260503] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:54,473 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:54,473 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 11:26:54,473 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1796628209] [2021-05-06 11:26:54,474 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 11:26:54,474 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:54,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 11:26:54,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 11:26:54,475 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:54,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:54,567 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2021-05-06 11:26:54,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 11:26:54,568 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-06 11:26:54,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:54,568 INFO L225 Difference]: With dead ends: 18 [2021-05-06 11:26:54,569 INFO L226 Difference]: Without dead ends: 13 [2021-05-06 11:26:54,570 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 71.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:26:54,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-05-06 11:26:54,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-05-06 11:26:54,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:54,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2021-05-06 11:26:54,575 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2021-05-06 11:26:54,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:54,575 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2021-05-06 11:26:54,575 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:54,575 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2021-05-06 11:26:54,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 11:26:54,576 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:54,576 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:54,576 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 11:26:54,576 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:54,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:54,577 INFO L82 PathProgramCache]: Analyzing trace with hash 1717471862, now seen corresponding path program 1 times [2021-05-06 11:26:54,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:54,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207249953] [2021-05-06 11:26:54,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:54,607 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:54,608 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2021-05-06 11:26:54,613 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:54,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:54,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:54,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:54,714 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:54,715 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:54,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207249953] [2021-05-06 11:26:54,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1207249953] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:54,715 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:54,715 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 11:26:54,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1551932748] [2021-05-06 11:26:54,716 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 11:26:54,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:54,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 11:26:54,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 11:26:54,717 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:54,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:54,798 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2021-05-06 11:26:54,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 11:26:54,798 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 11:26:54,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:54,799 INFO L225 Difference]: With dead ends: 19 [2021-05-06 11:26:54,799 INFO L226 Difference]: Without dead ends: 14 [2021-05-06 11:26:54,799 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 91.7ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:26:54,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-05-06 11:26:54,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-05-06 11:26:54,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 9 states have internal predecessors, (10), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:54,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2021-05-06 11:26:54,802 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2021-05-06 11:26:54,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:54,803 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2021-05-06 11:26:54,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:54,803 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2021-05-06 11:26:54,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-05-06 11:26:54,803 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:54,803 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:54,803 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-06 11:26:54,803 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:54,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:54,804 INFO L82 PathProgramCache]: Analyzing trace with hash 1738481436, now seen corresponding path program 2 times [2021-05-06 11:26:54,804 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:54,804 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1097662407] [2021-05-06 11:26:54,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:54,806 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:54,806 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2021-05-06 11:26:54,807 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:54,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:54,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:54,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:54,880 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:54,880 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:54,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1097662407] [2021-05-06 11:26:54,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1097662407] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:54,881 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:54,881 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 11:26:54,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299004075] [2021-05-06 11:26:54,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 11:26:54,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:54,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 11:26:54,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 11:26:54,882 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:54,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:54,977 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2021-05-06 11:26:54,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 11:26:54,978 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2021-05-06 11:26:54,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:54,979 INFO L225 Difference]: With dead ends: 20 [2021-05-06 11:26:54,979 INFO L226 Difference]: Without dead ends: 15 [2021-05-06 11:26:54,981 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 102.1ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:26:54,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-05-06 11:26:54,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-05-06 11:26:54,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.1) internal successors, (11), 10 states have internal predecessors, (11), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:54,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2021-05-06 11:26:54,992 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2021-05-06 11:26:54,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:54,993 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2021-05-06 11:26:54,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 states have internal predecessors, (9), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:54,993 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2021-05-06 11:26:54,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-05-06 11:26:54,993 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:54,994 INFO L523 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:54,994 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 11:26:54,994 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:54,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:54,994 INFO L82 PathProgramCache]: Analyzing trace with hash -1905189066, now seen corresponding path program 3 times [2021-05-06 11:26:54,994 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:54,995 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [895806942] [2021-05-06 11:26:54,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:54,998 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:54,998 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2021-05-06 11:26:55,000 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:55,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:55,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:55,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:55,095 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:55,095 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:55,095 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [895806942] [2021-05-06 11:26:55,095 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [895806942] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:55,095 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:55,095 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-06 11:26:55,095 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434829731] [2021-05-06 11:26:55,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 11:26:55,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:55,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 11:26:55,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 11:26:55,096 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:55,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:55,196 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2021-05-06 11:26:55,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 11:26:55,196 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2021-05-06 11:26:55,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:55,197 INFO L225 Difference]: With dead ends: 21 [2021-05-06 11:26:55,197 INFO L226 Difference]: Without dead ends: 16 [2021-05-06 11:26:55,197 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 125.3ms TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-05-06 11:26:55,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-06 11:26:55,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-06 11:26:55,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 11 states have internal predecessors, (12), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:55,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2021-05-06 11:26:55,200 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2021-05-06 11:26:55,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:55,200 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2021-05-06 11:26:55,200 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:55,200 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2021-05-06 11:26:55,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 11:26:55,201 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:55,201 INFO L523 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:55,201 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-06 11:26:55,201 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:55,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:55,202 INFO L82 PathProgramCache]: Analyzing trace with hash 1105142364, now seen corresponding path program 4 times [2021-05-06 11:26:55,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:55,202 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [537070142] [2021-05-06 11:26:55,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:55,204 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:55,204 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2021-05-06 11:26:55,205 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:55,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:55,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:55,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:55,298 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:55,298 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:55,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [537070142] [2021-05-06 11:26:55,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [537070142] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:55,299 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:55,299 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 11:26:55,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865618203] [2021-05-06 11:26:55,299 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 11:26:55,299 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:55,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 11:26:55,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 11:26:55,300 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:55,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:55,433 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2021-05-06 11:26:55,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 11:26:55,433 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-06 11:26:55,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:55,434 INFO L225 Difference]: With dead ends: 22 [2021-05-06 11:26:55,434 INFO L226 Difference]: Without dead ends: 17 [2021-05-06 11:26:55,434 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 154.5ms TimeCoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2021-05-06 11:26:55,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-05-06 11:26:55,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2021-05-06 11:26:55,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:55,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2021-05-06 11:26:55,437 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2021-05-06 11:26:55,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:55,437 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2021-05-06 11:26:55,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:55,437 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2021-05-06 11:26:55,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-06 11:26:55,438 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:55,438 INFO L523 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:55,438 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-06 11:26:55,438 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:55,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:55,438 INFO L82 PathProgramCache]: Analyzing trace with hash -63863818, now seen corresponding path program 5 times [2021-05-06 11:26:55,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:55,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53462398] [2021-05-06 11:26:55,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:55,441 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:55,441 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2021-05-06 11:26:55,441 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:55,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:55,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 11:26:55,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 11:26:55,523 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 11:26:55,523 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-06 11:26:55,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53462398] [2021-05-06 11:26:55,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [53462398] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 11:26:55,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 11:26:55,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-06 11:26:55,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181902749] [2021-05-06 11:26:55,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 11:26:55,524 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-06 11:26:55,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 11:26:55,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2021-05-06 11:26:55,525 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:55,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 11:26:55,692 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2021-05-06 11:26:55,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 11:26:55,692 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-06 11:26:55,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 11:26:55,693 INFO L225 Difference]: With dead ends: 23 [2021-05-06 11:26:55,693 INFO L226 Difference]: Without dead ends: 18 [2021-05-06 11:26:55,693 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 183.3ms TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-05-06 11:26:55,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-06 11:26:55,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-05-06 11:26:55,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:55,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2021-05-06 11:26:55,696 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2021-05-06 11:26:55,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 11:26:55,697 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2021-05-06 11:26:55,697 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 11:26:55,697 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2021-05-06 11:26:55,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 11:26:55,697 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 11:26:55,697 INFO L523 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 11:26:55,697 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-06 11:26:55,697 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 11:26:55,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 11:26:55,698 INFO L82 PathProgramCache]: Analyzing trace with hash -1943317092, now seen corresponding path program 6 times [2021-05-06 11:26:55,698 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-06 11:26:55,698 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [488203289] [2021-05-06 11:26:55,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 11:26:55,700 INFO L73 AcceleratorJordan]: Jordan loop acceleration statistics: 1 HavocedVariables, 2 AssignedVariables, 0 ReadonlyVariables, Eigenvalues: {}, 0 SequentialAcceleration, 0 AlternatingAcceleration, 0 QuantifierFreeResult [2021-05-06 11:26:55,700 WARN L75 AcceleratorJordan]: Jordan acceleration failed, because UNSUPPORTED_EIGENVALUES [2021-05-06 11:26:55,701 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-06 11:26:55,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-06 11:26:55,710 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-06 11:26:55,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-06 11:26:55,717 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-06 11:26:55,729 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-05-06 11:26:55,729 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-06 11:26:55,729 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-06 11:26:55,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 11:26:55 BoogieIcfgContainer [2021-05-06 11:26:55,739 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 11:26:55,739 INFO L168 Benchmark]: Toolchain (without parser) took 2098.66 ms. Allocated memory was 172.0 MB in the beginning and 206.6 MB in the end (delta: 34.6 MB). Free memory was 136.4 MB in the beginning and 79.9 MB in the end (delta: 56.5 MB). Peak memory consumption was 92.1 MB. Max. memory is 8.0 GB. [2021-05-06 11:26:55,740 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 172.0 MB. Free memory is still 153.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 11:26:55,740 INFO L168 Benchmark]: CACSL2BoogieTranslator took 179.39 ms. Allocated memory is still 172.0 MB. Free memory was 136.2 MB in the beginning and 155.1 MB in the end (delta: -18.9 MB). Peak memory consumption was 12.3 MB. Max. memory is 8.0 GB. [2021-05-06 11:26:55,740 INFO L168 Benchmark]: Boogie Preprocessor took 26.55 ms. Allocated memory is still 172.0 MB. Free memory was 155.1 MB in the beginning and 154.0 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-06 11:26:55,741 INFO L168 Benchmark]: RCFGBuilder took 216.10 ms. Allocated memory is still 172.0 MB. Free memory was 154.0 MB in the beginning and 140.4 MB in the end (delta: 13.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-06 11:26:55,741 INFO L168 Benchmark]: TraceAbstraction took 1669.11 ms. Allocated memory was 172.0 MB in the beginning and 206.6 MB in the end (delta: 34.6 MB). Free memory was 139.9 MB in the beginning and 79.9 MB in the end (delta: 60.0 MB). Peak memory consumption was 94.6 MB. Max. memory is 8.0 GB. [2021-05-06 11:26:55,742 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 172.0 MB. Free memory is still 153.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 179.39 ms. Allocated memory is still 172.0 MB. Free memory was 136.2 MB in the beginning and 155.1 MB in the end (delta: -18.9 MB). Peak memory consumption was 12.3 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 26.55 ms. Allocated memory is still 172.0 MB. Free memory was 155.1 MB in the beginning and 154.0 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 216.10 ms. Allocated memory is still 172.0 MB. Free memory was 154.0 MB in the beginning and 140.4 MB in the end (delta: 13.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1669.11 ms. Allocated memory was 172.0 MB in the beginning and 206.6 MB in the end (delta: 34.6 MB). Free memory was 139.9 MB in the beginning and 79.9 MB in the end (delta: 60.0 MB). Peak memory consumption was 94.6 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 7]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L13] unsigned int x = 0; [L14] unsigned int y = 1; [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND FALSE !(x < 6) [L21] CALL __VERIFIER_assert(y != 64) [L6] COND TRUE !(cond) [L7] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1629.7ms, OverallIterations: 8, TraceHistogramMax: 6, EmptinessCheckTime: 11.2ms, AutomataDifference: 732.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 5.6ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 76 SDtfs, 45 SDslu, 85 SDs, 0 SdLazy, 163 SolverSat, 50 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 142.0ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 70 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 754.6ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=18occurred in iteration=0, InterpolantAutomatonStates: 42, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 39.7ms AutomataMinimizationTime, 7 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 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...