/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/divbin_unwindbound5.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 14:38:46,903 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 14:38:46,904 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 14:38:46,921 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 14:38:46,921 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 14:38:46,922 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 14:38:46,923 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 14:38:46,924 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 14:38:46,925 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 14:38:46,926 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 14:38:46,926 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 14:38:46,927 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 14:38:46,927 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 14:38:46,928 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 14:38:46,928 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 14:38:46,929 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 14:38:46,929 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 14:38:46,930 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 14:38:46,931 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 14:38:46,932 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 14:38:46,933 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 14:38:46,941 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 14:38:46,942 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 14:38:46,942 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 14:38:46,944 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 14:38:46,944 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 14:38:46,944 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 14:38:46,945 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 14:38:46,945 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 14:38:46,945 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 14:38:46,946 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 14:38:46,946 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 14:38:46,947 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 14:38:46,947 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 14:38:46,948 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 14:38:46,948 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 14:38:46,948 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 14:38:46,949 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 14:38:46,949 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 14:38:46,949 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 14:38:46,950 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 14:38:46,957 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 14:38:46,986 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 14:38:46,987 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 14:38:46,989 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 14:38:46,989 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 14:38:46,989 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 14:38:46,989 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 14:38:46,989 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 14:38:46,989 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 14:38:46,989 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 14:38:46,989 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 14:38:46,990 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 14:38:46,990 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 14:38:46,990 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 14:38:46,990 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 14:38:46,991 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 14:38:46,991 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 14:38:46,991 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 14:38:46,991 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 14:38:46,991 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 14:38:46,991 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 14:38:46,991 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:38:46,991 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 14:38:46,992 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 14:38:46,992 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 14:38:46,992 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 14:38:46,992 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 14:38:46,992 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 14:38:46,992 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 14:38:46,992 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 14:38:47,259 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 14:38:47,277 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 14:38:47,279 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 14:38:47,280 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 14:38:47,280 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 14:38:47,281 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin_unwindbound5.i [2021-05-02 14:38:47,332 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cd523c6bd/8eac136f48f34e898afa6903edc67ccc/FLAGf2074bf99 [2021-05-02 14:38:47,750 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 14:38:47,750 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin_unwindbound5.i [2021-05-02 14:38:47,754 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cd523c6bd/8eac136f48f34e898afa6903edc67ccc/FLAGf2074bf99 [2021-05-02 14:38:47,768 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cd523c6bd/8eac136f48f34e898afa6903edc67ccc [2021-05-02 14:38:47,770 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 14:38:47,772 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 14:38:47,773 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 14:38:47,773 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 14:38:47,776 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 14:38:47,776 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:38:47" (1/1) ... [2021-05-02 14:38:47,777 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7dbce31b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:38:47, skipping insertion in model container [2021-05-02 14:38:47,777 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:38:47" (1/1) ... [2021-05-02 14:38:47,781 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 14:38:47,792 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 14:38:47,903 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin_unwindbound5.i[958,971] [2021-05-02 14:38:47,935 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:38:47,941 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 14:38:47,955 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin_unwindbound5.i[958,971] [2021-05-02 14:38:47,970 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:38:47,978 INFO L208 MainTranslator]: Completed translation [2021-05-02 14:38:47,979 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:38:47 WrapperNode [2021-05-02 14:38:47,979 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 14:38:47,979 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 14:38:47,979 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 14:38:47,979 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 14:38:47,986 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:38:47" (1/1) ... [2021-05-02 14:38:47,986 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:38:47" (1/1) ... [2021-05-02 14:38:47,990 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:38:47" (1/1) ... [2021-05-02 14:38:47,990 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:38:47" (1/1) ... [2021-05-02 14:38:48,000 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:38:47" (1/1) ... [2021-05-02 14:38:48,004 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:38:47" (1/1) ... [2021-05-02 14:38:48,007 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:38:47" (1/1) ... [2021-05-02 14:38:48,010 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 14:38:48,011 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 14:38:48,011 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 14:38:48,011 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 14:38:48,012 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:38:47" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:38:48,079 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 14:38:48,080 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 14:38:48,080 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 14:38:48,080 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 14:38:48,080 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 14:38:48,080 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 14:38:48,080 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 14:38:48,080 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 14:38:48,081 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 14:38:48,081 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 14:38:48,081 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 14:38:48,081 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 14:38:48,082 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 14:38:48,082 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 14:38:48,082 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 14:38:48,082 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 14:38:48,082 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 14:38:48,082 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 14:38:48,083 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 14:38:48,083 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 14:38:48,083 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 14:38:48,083 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 14:38:48,284 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 14:38:48,284 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 14:38:48,285 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:38:48 BoogieIcfgContainer [2021-05-02 14:38:48,285 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 14:38:48,286 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 14:38:48,286 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 14:38:48,292 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 14:38:48,292 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 02:38:47" (1/3) ... [2021-05-02 14:38:48,292 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22f1e5a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:38:48, skipping insertion in model container [2021-05-02 14:38:48,293 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:38:47" (2/3) ... [2021-05-02 14:38:48,293 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22f1e5a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:38:48, skipping insertion in model container [2021-05-02 14:38:48,293 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:38:48" (3/3) ... [2021-05-02 14:38:48,294 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin_unwindbound5.i [2021-05-02 14:38:48,297 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 14:38:48,300 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 14:38:48,327 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 14:38:48,376 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 14:38:48,376 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 14:38:48,377 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 14:38:48,377 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 14:38:48,377 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 14:38:48,377 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 14:38:48,377 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 14:38:48,377 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 14:38:48,386 INFO L276 IsEmpty]: Start isEmpty. Operand has 33 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:38:48,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 14:38:48,399 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:48,400 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:38:48,400 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:48,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:48,403 INFO L82 PathProgramCache]: Analyzing trace with hash 878397729, now seen corresponding path program 1 times [2021-05-02 14:38:48,408 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:48,408 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511461866] [2021-05-02 14:38:48,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:48,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:48,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 14:38:48,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:48,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 14:38:48,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:48,537 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 14:38:48,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:48,545 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:38:48,546 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:48,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511461866] [2021-05-02 14:38:48,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1511461866] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:38:48,547 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:38:48,547 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:38:48,548 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [505811735] [2021-05-02 14:38:48,550 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:38:48,551 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:48,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:38:48,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:38:48,562 INFO L87 Difference]: Start difference. First operand has 33 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:48,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:48,650 INFO L93 Difference]: Finished difference Result 60 states and 84 transitions. [2021-05-02 14:38:48,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:38:48,652 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 14:38:48,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:48,656 INFO L225 Difference]: With dead ends: 60 [2021-05-02 14:38:48,656 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 14:38:48,659 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 22.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:38:48,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 14:38:48,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-05-02 14:38:48,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:38:48,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-05-02 14:38:48,691 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 23 [2021-05-02 14:38:48,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:48,691 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-05-02 14:38:48,692 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:48,692 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-05-02 14:38:48,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-05-02 14:38:48,693 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:48,693 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:38:48,693 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 14:38:48,694 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:48,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:48,694 INFO L82 PathProgramCache]: Analyzing trace with hash 994169231, now seen corresponding path program 1 times [2021-05-02 14:38:48,695 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:48,695 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622132454] [2021-05-02 14:38:48,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:48,721 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:48,721 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1616660691] [2021-05-02 14:38:48,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:48,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:48,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 14:38:48,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:48,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:48,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:48,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:48,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:48,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:48,943 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:38:48,943 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:48,943 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622132454] [2021-05-02 14:38:48,943 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:48,943 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1616660691] [2021-05-02 14:38:48,943 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1616660691] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:38:48,943 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:38:48,943 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 14:38:48,944 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18478935] [2021-05-02 14:38:48,944 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 14:38:48,944 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:48,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 14:38:48,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 14:38:48,945 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:48,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:48,964 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2021-05-02 14:38:48,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 14:38:48,964 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-05-02 14:38:48,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:48,965 INFO L225 Difference]: With dead ends: 42 [2021-05-02 14:38:48,965 INFO L226 Difference]: Without dead ends: 30 [2021-05-02 14:38:48,966 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 6.1ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 14:38:48,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-05-02 14:38:48,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-05-02 14:38:48,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 20 states have (on average 1.3) internal successors, (26), 21 states have internal predecessors, (26), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:38:48,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2021-05-02 14:38:48,981 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 25 [2021-05-02 14:38:48,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:48,981 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2021-05-02 14:38:48,981 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:48,982 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2021-05-02 14:38:48,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 14:38:48,982 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:48,982 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:38:49,183 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 14:38:49,183 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:49,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:49,183 INFO L82 PathProgramCache]: Analyzing trace with hash 422434646, now seen corresponding path program 1 times [2021-05-02 14:38:49,184 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:49,184 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [648873815] [2021-05-02 14:38:49,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:49,197 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:49,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [571446566] [2021-05-02 14:38:49,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:49,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:49,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:38:49,261 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:49,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:49,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:49,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:49,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:49,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:49,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:49,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:49,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:49,356 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:38:49,357 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:49,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [648873815] [2021-05-02 14:38:49,357 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:49,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571446566] [2021-05-02 14:38:49,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571446566] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:38:49,357 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:38:49,357 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:38:49,357 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802379894] [2021-05-02 14:38:49,358 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:38:49,358 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:49,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:38:49,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:38:49,358 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:49,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:49,378 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2021-05-02 14:38:49,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:38:49,378 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-05-02 14:38:49,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:49,379 INFO L225 Difference]: With dead ends: 41 [2021-05-02 14:38:49,379 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 14:38:49,379 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 7.8ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:38:49,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 14:38:49,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-02 14:38:49,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 23 states have (on average 1.3043478260869565) internal successors, (30), 24 states have internal predecessors, (30), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:38:49,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 40 transitions. [2021-05-02 14:38:49,382 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 40 transitions. Word has length 26 [2021-05-02 14:38:49,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:49,383 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 40 transitions. [2021-05-02 14:38:49,383 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:49,383 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 40 transitions. [2021-05-02 14:38:49,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 14:38:49,383 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:49,383 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:38:49,592 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:49,593 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:49,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:49,593 INFO L82 PathProgramCache]: Analyzing trace with hash 424222106, now seen corresponding path program 1 times [2021-05-02 14:38:49,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:49,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265449290] [2021-05-02 14:38:49,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:49,609 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:49,610 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [734639233] [2021-05-02 14:38:49,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:49,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:49,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 14:38:49,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:49,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:49,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:49,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:49,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:49,786 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 14:38:49,787 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:49,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265449290] [2021-05-02 14:38:49,787 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:49,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734639233] [2021-05-02 14:38:49,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [734639233] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:38:49,787 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:38:49,787 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:38:49,787 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780561143] [2021-05-02 14:38:49,788 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:38:49,788 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:49,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:38:49,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:38:49,788 INFO L87 Difference]: Start difference. First operand 33 states and 40 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:49,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:49,931 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2021-05-02 14:38:49,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:38:49,931 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-05-02 14:38:49,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:49,932 INFO L225 Difference]: With dead ends: 45 [2021-05-02 14:38:49,932 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 14:38:49,933 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 79.0ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:38:49,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 14:38:49,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-02 14:38:49,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 28 states have (on average 1.2857142857142858) internal successors, (36), 29 states have internal predecessors, (36), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:38:49,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2021-05-02 14:38:49,937 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 26 [2021-05-02 14:38:49,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:49,938 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2021-05-02 14:38:49,938 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:49,938 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2021-05-02 14:38:49,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 14:38:49,938 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:49,939 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:38:50,139 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:50,139 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:50,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:50,140 INFO L82 PathProgramCache]: Analyzing trace with hash -193375877, now seen corresponding path program 1 times [2021-05-02 14:38:50,140 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:50,140 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [971906423] [2021-05-02 14:38:50,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:50,149 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:50,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [938269303] [2021-05-02 14:38:50,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:50,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:50,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:38:50,189 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:50,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,246 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:38:50,246 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:50,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [971906423] [2021-05-02 14:38:50,246 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:50,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [938269303] [2021-05-02 14:38:50,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [938269303] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:38:50,246 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:38:50,247 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 14:38:50,247 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077066897] [2021-05-02 14:38:50,247 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:38:50,247 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:50,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:38:50,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:38:50,247 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:50,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:50,273 INFO L93 Difference]: Finished difference Result 55 states and 67 transitions. [2021-05-02 14:38:50,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:38:50,273 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 28 [2021-05-02 14:38:50,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:50,274 INFO L225 Difference]: With dead ends: 55 [2021-05-02 14:38:50,274 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 14:38:50,274 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 11.2ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:38:50,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 14:38:50,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-05-02 14:38:50,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2666666666666666) internal successors, (38), 31 states have internal predecessors, (38), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:38:50,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-05-02 14:38:50,278 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 28 [2021-05-02 14:38:50,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:50,278 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-05-02 14:38:50,278 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:50,278 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-05-02 14:38:50,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 14:38:50,279 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:50,279 INFO L523 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] [2021-05-02 14:38:50,499 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:50,500 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:50,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:50,500 INFO L82 PathProgramCache]: Analyzing trace with hash -2031725334, now seen corresponding path program 1 times [2021-05-02 14:38:50,500 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:50,500 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [305426458] [2021-05-02 14:38:50,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:50,510 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:50,510 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1423660483] [2021-05-02 14:38:50,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:50,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:50,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:38:50,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:50,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,584 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,598 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:50,633 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:38:50,634 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:50,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [305426458] [2021-05-02 14:38:50,634 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:50,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423660483] [2021-05-02 14:38:50,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423660483] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:38:50,636 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:38:50,636 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:38:50,636 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561327706] [2021-05-02 14:38:50,637 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:38:50,637 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:50,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:38:50,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:38:50,638 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:50,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:50,677 INFO L93 Difference]: Finished difference Result 64 states and 74 transitions. [2021-05-02 14:38:50,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 14:38:50,677 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 14:38:50,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:50,678 INFO L225 Difference]: With dead ends: 64 [2021-05-02 14:38:50,678 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 14:38:50,678 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 15.1ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:38:50,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 14:38:50,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2021-05-02 14:38:50,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.25) internal successors, (50), 41 states have internal predecessors, (50), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:38:50,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2021-05-02 14:38:50,682 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 29 [2021-05-02 14:38:50,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:50,682 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2021-05-02 14:38:50,683 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 states have internal predecessors, (18), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:50,683 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2021-05-02 14:38:50,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 14:38:50,683 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:50,683 INFO L523 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] [2021-05-02 14:38:50,894 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 14:38:50,895 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:50,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:50,895 INFO L82 PathProgramCache]: Analyzing trace with hash -2029937874, now seen corresponding path program 1 times [2021-05-02 14:38:50,895 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:50,895 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286214795] [2021-05-02 14:38:50,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:50,904 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:50,904 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [491467217] [2021-05-02 14:38:50,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:50,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:50,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 14:38:50,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:51,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,119 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:38:51,119 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:51,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286214795] [2021-05-02 14:38:51,119 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:51,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491467217] [2021-05-02 14:38:51,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491467217] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:38:51,119 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:38:51,120 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:38:51,120 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847078850] [2021-05-02 14:38:51,120 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:38:51,120 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:51,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:38:51,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:38:51,120 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:51,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:51,299 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2021-05-02 14:38:51,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:38:51,300 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 14:38:51,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:51,300 INFO L225 Difference]: With dead ends: 69 [2021-05-02 14:38:51,300 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 14:38:51,301 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 141.1ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:38:51,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 14:38:51,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 53. [2021-05-02 14:38:51,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 39 states have (on average 1.2307692307692308) internal successors, (48), 40 states have internal predecessors, (48), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:38:51,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 62 transitions. [2021-05-02 14:38:51,305 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 62 transitions. Word has length 29 [2021-05-02 14:38:51,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:51,305 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 62 transitions. [2021-05-02 14:38:51,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:38:51,305 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 62 transitions. [2021-05-02 14:38:51,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-05-02 14:38:51,306 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:51,306 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:38:51,506 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:51,507 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:51,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:51,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1731935178, now seen corresponding path program 1 times [2021-05-02 14:38:51,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:51,507 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667397704] [2021-05-02 14:38:51,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:51,516 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:51,516 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1567356004] [2021-05-02 14:38:51,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:51,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:51,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-02 14:38:51,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:51,609 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:38:51,609 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:51,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667397704] [2021-05-02 14:38:51,609 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:51,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567356004] [2021-05-02 14:38:51,609 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567356004] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:38:51,609 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:38:51,609 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:38:51,609 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338916394] [2021-05-02 14:38:51,609 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:38:51,610 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:51,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:38:51,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:38:51,610 INFO L87 Difference]: Start difference. First operand 53 states and 62 transitions. Second operand has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:38:51,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:51,620 INFO L93 Difference]: Finished difference Result 74 states and 87 transitions. [2021-05-02 14:38:51,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:38:51,621 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 35 [2021-05-02 14:38:51,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:51,621 INFO L225 Difference]: With dead ends: 74 [2021-05-02 14:38:51,621 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 14:38:51,622 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:38:51,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 14:38:51,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 14:38:51,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 31 states have internal predecessors, (37), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:38:51,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 49 transitions. [2021-05-02 14:38:51,635 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 49 transitions. Word has length 35 [2021-05-02 14:38:51,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:51,635 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 49 transitions. [2021-05-02 14:38:51,635 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 7.333333333333333) internal successors, (22), 3 states have internal predecessors, (22), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:38:51,635 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 49 transitions. [2021-05-02 14:38:51,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 14:38:51,636 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:51,636 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:38:51,836 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:51,837 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:51,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:51,837 INFO L82 PathProgramCache]: Analyzing trace with hash 815990494, now seen corresponding path program 1 times [2021-05-02 14:38:51,837 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:51,837 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248845408] [2021-05-02 14:38:51,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:51,845 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:51,845 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [267054882] [2021-05-02 14:38:51,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:51,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:51,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:38:51,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:51,899 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,917 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:51,970 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:38:51,970 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:51,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248845408] [2021-05-02 14:38:51,970 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:51,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [267054882] [2021-05-02 14:38:51,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [267054882] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:38:51,970 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:38:51,970 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:38:51,970 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172909209] [2021-05-02 14:38:51,971 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:38:51,971 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:51,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:38:51,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:38:51,971 INFO L87 Difference]: Start difference. First operand 42 states and 49 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:38:52,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:52,028 INFO L93 Difference]: Finished difference Result 67 states and 78 transitions. [2021-05-02 14:38:52,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:38:52,029 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 38 [2021-05-02 14:38:52,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:52,029 INFO L225 Difference]: With dead ends: 67 [2021-05-02 14:38:52,029 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 14:38:52,030 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 21.2ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:38:52,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 14:38:52,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2021-05-02 14:38:52,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 40 states have (on average 1.225) internal successors, (49), 41 states have internal predecessors, (49), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:38:52,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 63 transitions. [2021-05-02 14:38:52,048 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 63 transitions. Word has length 38 [2021-05-02 14:38:52,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:52,049 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 63 transitions. [2021-05-02 14:38:52,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:38:52,049 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 63 transitions. [2021-05-02 14:38:52,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 14:38:52,049 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:52,049 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 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] [2021-05-02 14:38:52,253 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 14:38:52,253 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:52,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:52,253 INFO L82 PathProgramCache]: Analyzing trace with hash 817777954, now seen corresponding path program 1 times [2021-05-02 14:38:52,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:52,253 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863385401] [2021-05-02 14:38:52,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:52,261 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:52,261 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1501854883] [2021-05-02 14:38:52,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:52,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:52,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 14:38:52,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:52,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:52,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:52,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:52,462 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:52,558 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:52,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:52,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:52,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:52,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:52,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:53,294 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:38:53,295 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:53,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863385401] [2021-05-02 14:38:53,295 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:53,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1501854883] [2021-05-02 14:38:53,295 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1501854883] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:38:53,295 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:38:53,295 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 14:38:53,295 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658270169] [2021-05-02 14:38:53,295 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 14:38:53,295 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:53,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 14:38:53,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:38:53,296 INFO L87 Difference]: Start difference. First operand 54 states and 63 transitions. Second operand has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:38:53,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:53,754 INFO L93 Difference]: Finished difference Result 79 states and 95 transitions. [2021-05-02 14:38:53,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 14:38:53,754 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 38 [2021-05-02 14:38:53,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:53,755 INFO L225 Difference]: With dead ends: 79 [2021-05-02 14:38:53,755 INFO L226 Difference]: Without dead ends: 76 [2021-05-02 14:38:53,755 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 440.8ms TimeCoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-05-02 14:38:53,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-05-02 14:38:53,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 63. [2021-05-02 14:38:53,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 46 states have (on average 1.1956521739130435) internal successors, (55), 48 states have internal predecessors, (55), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:38:53,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 73 transitions. [2021-05-02 14:38:53,760 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 73 transitions. Word has length 38 [2021-05-02 14:38:53,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:53,760 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 73 transitions. [2021-05-02 14:38:53,760 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:38:53,761 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 73 transitions. [2021-05-02 14:38:53,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 14:38:53,761 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:53,761 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:38:53,969 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:53,969 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:53,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:53,969 INFO L82 PathProgramCache]: Analyzing trace with hash 268409689, now seen corresponding path program 1 times [2021-05-02 14:38:53,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:53,970 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1595380339] [2021-05-02 14:38:53,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:53,977 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:53,977 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [738403313] [2021-05-02 14:38:53,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:54,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:38:54,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:38:54,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:54,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,034 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,085 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 14:38:54,085 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:54,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1595380339] [2021-05-02 14:38:54,086 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:54,086 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [738403313] [2021-05-02 14:38:54,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [738403313] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:38:54,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:38:54,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:38:54,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000140714] [2021-05-02 14:38:54,086 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:38:54,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:54,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:38:54,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:38:54,087 INFO L87 Difference]: Start difference. First operand 63 states and 73 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:38:54,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:54,117 INFO L93 Difference]: Finished difference Result 99 states and 116 transitions. [2021-05-02 14:38:54,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:38:54,118 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 40 [2021-05-02 14:38:54,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:54,119 INFO L225 Difference]: With dead ends: 99 [2021-05-02 14:38:54,119 INFO L226 Difference]: Without dead ends: 65 [2021-05-02 14:38:54,120 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 16.6ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:38:54,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-02 14:38:54,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2021-05-02 14:38:54,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 48 states have (on average 1.1875) internal successors, (57), 50 states have internal predecessors, (57), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:38:54,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2021-05-02 14:38:54,130 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 40 [2021-05-02 14:38:54,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:54,130 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2021-05-02 14:38:54,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:38:54,130 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2021-05-02 14:38:54,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 14:38:54,133 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:54,133 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:38:54,348 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:54,349 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:54,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:54,349 INFO L82 PathProgramCache]: Analyzing trace with hash 829605357, now seen corresponding path program 2 times [2021-05-02 14:38:54,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:54,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818842710] [2021-05-02 14:38:54,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:54,356 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:54,356 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2065926257] [2021-05-02 14:38:54,361 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:54,410 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:38:54,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:38:54,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:38:54,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:54,426 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,463 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,464 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,494 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 14:38:54,494 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:54,494 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818842710] [2021-05-02 14:38:54,494 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:54,494 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2065926257] [2021-05-02 14:38:54,494 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2065926257] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:38:54,494 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:38:54,494 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:38:54,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105355473] [2021-05-02 14:38:54,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:38:54,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:54,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:38:54,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:38:54,495 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:38:54,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:54,538 INFO L93 Difference]: Finished difference Result 106 states and 125 transitions. [2021-05-02 14:38:54,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:38:54,538 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 43 [2021-05-02 14:38:54,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:54,539 INFO L225 Difference]: With dead ends: 106 [2021-05-02 14:38:54,539 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 14:38:54,539 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 28.4ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:38:54,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 14:38:54,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 68. [2021-05-02 14:38:54,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 51 states have (on average 1.196078431372549) internal successors, (61), 53 states have internal predecessors, (61), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 7 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:38:54,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-05-02 14:38:54,543 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 43 [2021-05-02 14:38:54,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:54,543 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-05-02 14:38:54,543 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 3 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:38:54,543 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-05-02 14:38:54,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 14:38:54,543 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:54,544 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:38:54,757 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 14:38:54,757 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:54,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:54,757 INFO L82 PathProgramCache]: Analyzing trace with hash -897932583, now seen corresponding path program 3 times [2021-05-02 14:38:54,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:54,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943342092] [2021-05-02 14:38:54,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:54,768 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:54,768 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1498491681] [2021-05-02 14:38:54,768 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:54,808 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 14:38:54,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:38:54,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-02 14:38:54,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:54,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,853 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,860 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:54,878 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 14:38:54,879 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:54,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943342092] [2021-05-02 14:38:54,880 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:54,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498491681] [2021-05-02 14:38:54,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1498491681] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:38:54,881 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:38:54,881 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:38:54,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371426446] [2021-05-02 14:38:54,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:38:54,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:54,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:38:54,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:38:54,882 INFO L87 Difference]: Start difference. First operand 68 states and 79 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:38:54,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:54,903 INFO L93 Difference]: Finished difference Result 97 states and 112 transitions. [2021-05-02 14:38:54,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:38:54,904 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 46 [2021-05-02 14:38:54,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:54,904 INFO L225 Difference]: With dead ends: 97 [2021-05-02 14:38:54,904 INFO L226 Difference]: Without dead ends: 63 [2021-05-02 14:38:54,905 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.6ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:38:54,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-02 14:38:54,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2021-05-02 14:38:54,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 35 states have internal predecessors, (40), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:38:54,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 54 transitions. [2021-05-02 14:38:54,909 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 54 transitions. Word has length 46 [2021-05-02 14:38:54,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:54,909 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 54 transitions. [2021-05-02 14:38:54,909 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 5 states have internal predecessors, (23), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 14:38:54,909 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 54 transitions. [2021-05-02 14:38:54,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 14:38:54,910 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:54,910 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:38:55,125 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 14:38:55,125 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:55,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:55,125 INFO L82 PathProgramCache]: Analyzing trace with hash 1469925226, now seen corresponding path program 2 times [2021-05-02 14:38:55,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:55,125 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071563463] [2021-05-02 14:38:55,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:55,144 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:55,145 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [492556276] [2021-05-02 14:38:55,145 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:55,188 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:38:55,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:38:55,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 14:38:55,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:55,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,199 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,273 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,283 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:38:55,283 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:55,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071563463] [2021-05-02 14:38:55,283 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:55,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492556276] [2021-05-02 14:38:55,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [492556276] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:38:55,283 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:38:55,283 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:38:55,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415978252] [2021-05-02 14:38:55,284 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:38:55,284 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:55,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:38:55,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:38:55,284 INFO L87 Difference]: Start difference. First operand 48 states and 54 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:38:55,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:55,337 INFO L93 Difference]: Finished difference Result 98 states and 110 transitions. [2021-05-02 14:38:55,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:38:55,338 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-05-02 14:38:55,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:55,339 INFO L225 Difference]: With dead ends: 98 [2021-05-02 14:38:55,339 INFO L226 Difference]: Without dead ends: 91 [2021-05-02 14:38:55,339 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 32.7ms TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:38:55,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-05-02 14:38:55,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 71. [2021-05-02 14:38:55,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 53 states have (on average 1.169811320754717) internal successors, (62), 54 states have internal predecessors, (62), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:38:55,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 80 transitions. [2021-05-02 14:38:55,348 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 80 transitions. Word has length 47 [2021-05-02 14:38:55,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:55,348 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 80 transitions. [2021-05-02 14:38:55,348 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:38:55,348 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 80 transitions. [2021-05-02 14:38:55,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 14:38:55,349 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:55,349 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:38:55,563 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 14:38:55,564 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:55,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:55,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1471712686, now seen corresponding path program 2 times [2021-05-02 14:38:55,564 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:55,564 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113024161] [2021-05-02 14:38:55,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:55,581 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:55,581 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [192186498] [2021-05-02 14:38:55,581 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:55,796 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:38:55,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:38:55,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 14:38:55,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:55,820 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:55,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:56,191 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 23 [2021-05-02 14:38:56,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:56,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:56,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:56,583 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-05-02 14:38:56,583 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:38:56,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113024161] [2021-05-02 14:38:56,583 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:38:56,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [192186498] [2021-05-02 14:38:56,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [192186498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:38:56,583 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:38:56,583 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 14:38:56,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859902555] [2021-05-02 14:38:56,584 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 14:38:56,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:38:56,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 14:38:56,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:38:56,584 INFO L87 Difference]: Start difference. First operand 71 states and 80 transitions. Second operand has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:38:56,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:38:56,791 INFO L93 Difference]: Finished difference Result 100 states and 113 transitions. [2021-05-02 14:38:56,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:38:56,792 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-05-02 14:38:56,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:38:56,792 INFO L225 Difference]: With dead ends: 100 [2021-05-02 14:38:56,792 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 14:38:56,793 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 295.0ms TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:38:56,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 14:38:56,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-05-02 14:38:56,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 37 states have (on average 1.162162162162162) internal successors, (43), 38 states have internal predecessors, (43), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:38:56,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 57 transitions. [2021-05-02 14:38:56,796 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 57 transitions. Word has length 47 [2021-05-02 14:38:56,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:38:56,796 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 57 transitions. [2021-05-02 14:38:56,796 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.9) internal successors, (29), 9 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:38:56,796 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 57 transitions. [2021-05-02 14:38:56,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 14:38:56,796 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:38:56,796 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:38:57,001 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:57,001 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:38:57,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:38:57,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1045745238, now seen corresponding path program 3 times [2021-05-02 14:38:57,002 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:38:57,002 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586149528] [2021-05-02 14:38:57,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:38:57,010 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:38:57,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2146517672] [2021-05-02 14:38:57,010 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:38:57,828 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:38:57,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:38:57,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 14:38:57,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:38:57,856 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:57,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:58,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:58,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:58,733 WARN L205 SmtUtils]: Spent 282.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2021-05-02 14:38:58,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:58,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:38:59,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:39:00,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:39:00,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:39:00,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:39:00,299 WARN L159 QuantifierPusher]: Ignoring assumption.