/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/hard-u_unwindbound100.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 03:15:12,847 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 03:15:12,850 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 03:15:12,881 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-06 03:15:12,882 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-06 03:15:12,884 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-06 03:15:12,885 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-06 03:15:12,890 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-06 03:15:12,892 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-06 03:15:12,895 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-06 03:15:12,896 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-06 03:15:12,897 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-06 03:15:12,897 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 03:15:12,899 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 03:15:12,900 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 03:15:12,901 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 03:15:12,902 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 03:15:12,903 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 03:15:12,904 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 03:15:12,908 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 03:15:12,909 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 03:15:12,910 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 03:15:12,911 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 03:15:12,912 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 03:15:12,917 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-06 03:15:12,917 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-06 03:15:12,917 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-06 03:15:12,918 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-06 03:15:12,919 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-06 03:15:12,919 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-06 03:15:12,919 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-06 03:15:12,920 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-06 03:15:12,921 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-06 03:15:12,921 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-06 03:15:12,922 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-06 03:15:12,922 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-06 03:15:12,922 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-06 03:15:12,922 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-06 03:15:12,922 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 03:15:12,923 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 03:15:12,923 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 03:15:12,926 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 [2021-05-06 03:15:12,953 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 03:15:12,953 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 03:15:12,955 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 03:15:12,955 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 03:15:12,955 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 03:15:12,956 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 03:15:12,956 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 03:15:12,956 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 03:15:12,956 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 03:15:12,956 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 03:15:12,957 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 03:15:12,957 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 03:15:12,957 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 03:15:12,957 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 03:15:12,957 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 03:15:12,957 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 03:15:12,957 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 03:15:12,957 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 03:15:12,958 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 03:15:12,958 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 03:15:12,958 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 03:15:12,958 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 03:15:12,958 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 03:15:12,958 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 03:15:12,958 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 03:15:12,958 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 03:15:12,958 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 03:15:12,959 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 03:15:12,959 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 03:15:13,208 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 03:15:13,220 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 03:15:13,222 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 03:15:13,223 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 03:15:13,223 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 03:15:13,224 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound100.c [2021-05-06 03:15:13,269 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1a2a0421f/377167e3c4c14d75bf0021b01c883940/FLAG041f71cee [2021-05-06 03:15:13,629 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 03:15:13,629 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-u_unwindbound100.c [2021-05-06 03:15:13,634 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1a2a0421f/377167e3c4c14d75bf0021b01c883940/FLAG041f71cee [2021-05-06 03:15:13,650 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1a2a0421f/377167e3c4c14d75bf0021b01c883940 [2021-05-06 03:15:13,652 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 03:15:13,654 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 03:15:13,657 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 03:15:13,657 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 03:15:13,662 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 03:15:13,662 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 03:15:13" (1/1) ... [2021-05-06 03:15:13,663 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5258a519 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:15:13, skipping insertion in model container [2021-05-06 03:15:13,663 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 03:15:13" (1/1) ... [2021-05-06 03:15:13,668 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 03:15:13,679 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 03:15:13,796 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/hard-u_unwindbound100.c[545,558] [2021-05-06 03:15:13,812 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 03:15:13,821 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 03:15:13,831 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/hard-u_unwindbound100.c[545,558] [2021-05-06 03:15:13,842 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 03:15:13,854 INFO L208 MainTranslator]: Completed translation [2021-05-06 03:15:13,854 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:15:13 WrapperNode [2021-05-06 03:15:13,854 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 03:15:13,856 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 03:15:13,856 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 03:15:13,857 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 03:15:13,887 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:15:13" (1/1) ... [2021-05-06 03:15:13,887 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:15:13" (1/1) ... [2021-05-06 03:15:13,904 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:15:13" (1/1) ... [2021-05-06 03:15:13,905 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:15:13" (1/1) ... [2021-05-06 03:15:13,908 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:15:13" (1/1) ... [2021-05-06 03:15:13,919 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:15:13" (1/1) ... [2021-05-06 03:15:13,920 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:15:13" (1/1) ... [2021-05-06 03:15:13,921 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 03:15:13,922 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 03:15:13,922 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 03:15:13,922 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 03:15:13,922 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:15:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 03:15:13,993 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 03:15:13,993 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 03:15:13,993 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 03:15:13,993 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 03:15:13,994 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 03:15:13,994 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 03:15:13,994 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 03:15:13,994 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 03:15:13,994 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 03:15:13,994 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 03:15:13,995 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-06 03:15:13,995 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 03:15:13,995 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 03:15:13,995 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 03:15:13,996 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 03:15:13,996 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 03:15:13,996 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 03:15:13,996 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 03:15:13,996 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 03:15:13,996 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 03:15:14,193 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 03:15:14,193 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 03:15:14,194 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 03:15:14 BoogieIcfgContainer [2021-05-06 03:15:14,194 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 03:15:14,195 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 03:15:14,195 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 03:15:14,213 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 03:15:14,213 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 03:15:13" (1/3) ... [2021-05-06 03:15:14,213 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c8df6b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 03:15:14, skipping insertion in model container [2021-05-06 03:15:14,213 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 03:15:13" (2/3) ... [2021-05-06 03:15:14,214 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c8df6b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 03:15:14, skipping insertion in model container [2021-05-06 03:15:14,214 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 03:15:14" (3/3) ... [2021-05-06 03:15:14,215 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-u_unwindbound100.c [2021-05-06 03:15:14,218 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 03:15:14,220 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 03:15:14,237 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 03:15:14,277 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 03:15:14,278 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 03:15:14,278 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 03:15:14,278 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 03:15:14,278 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 03:15:14,278 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 03:15:14,278 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 03:15:14,278 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 03:15:14,292 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 03:15:14,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 03:15:14,295 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:15:14,295 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:15:14,295 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:15:14,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:15:14,303 INFO L82 PathProgramCache]: Analyzing trace with hash 1191571617, now seen corresponding path program 1 times [2021-05-06 03:15:14,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:15:14,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1765741354] [2021-05-06 03:15:14,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:15:14,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:14,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 03:15:14,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:14,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 03:15:14,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:14,512 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 03:15:14,512 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:15:14,512 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1765741354] [2021-05-06 03:15:14,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1765741354] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:15:14,514 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:15:14,514 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 03:15:14,515 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488892384] [2021-05-06 03:15:14,517 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 03:15:14,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:15:14,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 03:15:14,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 03:15:14,529 INFO L87 Difference]: Start difference. First operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 03:15:14,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:15:14,680 INFO L93 Difference]: Finished difference Result 66 states and 101 transitions. [2021-05-06 03:15:14,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 03:15:14,681 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-06 03:15:14,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:15:14,686 INFO L225 Difference]: With dead ends: 66 [2021-05-06 03:15:14,686 INFO L226 Difference]: Without dead ends: 33 [2021-05-06 03:15:14,688 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 46.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 03:15:14,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-06 03:15:14,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-05-06 03:15:14,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 03:15:14,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-06 03:15:14,724 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 18 [2021-05-06 03:15:14,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:15:14,724 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-06 03:15:14,724 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 03:15:14,725 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-06 03:15:14,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 03:15:14,725 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:15:14,726 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:15:14,726 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 03:15:14,726 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:15:14,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:15:14,727 INFO L82 PathProgramCache]: Analyzing trace with hash 336486197, now seen corresponding path program 1 times [2021-05-06 03:15:14,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:15:14,727 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105373973] [2021-05-06 03:15:14,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:15:14,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:14,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 03:15:14,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:14,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 03:15:14,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:14,874 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 03:15:14,874 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:15:14,874 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105373973] [2021-05-06 03:15:14,874 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105373973] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:15:14,875 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:15:14,875 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 03:15:14,875 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743963839] [2021-05-06 03:15:14,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:15:14,877 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:15:14,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:15:14,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:15:14,879 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 03:15:15,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:15:15,150 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2021-05-06 03:15:15,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 03:15:15,151 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-06 03:15:15,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:15:15,152 INFO L225 Difference]: With dead ends: 47 [2021-05-06 03:15:15,152 INFO L226 Difference]: Without dead ends: 45 [2021-05-06 03:15:15,152 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 139.5ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 03:15:15,153 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-06 03:15:15,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2021-05-06 03:15:15,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 22 states have internal predecessors, (27), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 03:15:15,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2021-05-06 03:15:15,159 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 18 [2021-05-06 03:15:15,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:15:15,159 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2021-05-06 03:15:15,160 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 03:15:15,160 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2021-05-06 03:15:15,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-06 03:15:15,160 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:15:15,160 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:15:15,160 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 03:15:15,160 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:15:15,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:15:15,161 INFO L82 PathProgramCache]: Analyzing trace with hash -1819267188, now seen corresponding path program 1 times [2021-05-06 03:15:15,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:15:15,161 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511901151] [2021-05-06 03:15:15,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:15:15,168 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:15:15,169 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1878447528] [2021-05-06 03:15:15,169 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 [2021-05-06 03:15:15,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:15,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 03:15:15,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:15:15,275 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:15,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:15,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:15,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:15,313 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:15,326 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 03:15:15,326 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:15:15,326 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511901151] [2021-05-06 03:15:15,327 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:15:15,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878447528] [2021-05-06 03:15:15,327 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878447528] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:15:15,327 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:15:15,327 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 03:15:15,327 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180542880] [2021-05-06 03:15:15,327 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 03:15:15,327 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:15:15,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 03:15:15,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 03:15:15,328 INFO L87 Difference]: Start difference. First operand 36 states and 45 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 03:15:15,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:15:15,337 INFO L93 Difference]: Finished difference Result 52 states and 67 transitions. [2021-05-06 03:15:15,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 03:15:15,338 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-06 03:15:15,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:15:15,339 INFO L225 Difference]: With dead ends: 52 [2021-05-06 03:15:15,339 INFO L226 Difference]: Without dead ends: 38 [2021-05-06 03:15:15,339 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 18.7ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 03:15:15,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-06 03:15:15,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-06 03:15:15,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 24 states have internal predecessors, (29), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 03:15:15,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 47 transitions. [2021-05-06 03:15:15,343 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 47 transitions. Word has length 20 [2021-05-06 03:15:15,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:15:15,344 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 47 transitions. [2021-05-06 03:15:15,344 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 03:15:15,344 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 47 transitions. [2021-05-06 03:15:15,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 03:15:15,344 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:15:15,344 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:15:15,561 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-06 03:15:15,561 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:15:15,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:15:15,562 INFO L82 PathProgramCache]: Analyzing trace with hash -784889968, now seen corresponding path program 1 times [2021-05-06 03:15:15,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:15:15,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [542563721] [2021-05-06 03:15:15,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:15:15,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:15,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 03:15:15,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:15,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 03:15:15,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:15,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-06 03:15:15,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:15,644 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 03:15:15,644 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:15:15,644 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [542563721] [2021-05-06 03:15:15,644 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [542563721] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:15:15,644 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:15:15,644 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 03:15:15,644 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494749454] [2021-05-06 03:15:15,645 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:15:15,645 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:15:15,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:15:15,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:15:15,645 INFO L87 Difference]: Start difference. First operand 38 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 03:15:15,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:15:15,869 INFO L93 Difference]: Finished difference Result 52 states and 66 transitions. [2021-05-06 03:15:15,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 03:15:15,869 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-06 03:15:15,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:15:15,870 INFO L225 Difference]: With dead ends: 52 [2021-05-06 03:15:15,870 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 03:15:15,870 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 115.2ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-06 03:15:15,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 03:15:15,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 42. [2021-05-06 03:15:15,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 03:15:15,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-05-06 03:15:15,876 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 23 [2021-05-06 03:15:15,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:15:15,876 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-05-06 03:15:15,877 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 03:15:15,877 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-05-06 03:15:15,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-06 03:15:15,878 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:15:15,878 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:15:15,878 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 03:15:15,878 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:15:15,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:15:15,879 INFO L82 PathProgramCache]: Analyzing trace with hash -1024624683, now seen corresponding path program 1 times [2021-05-06 03:15:15,879 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:15:15,879 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070353056] [2021-05-06 03:15:15,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:15:15,901 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:15:15,901 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1879921149] [2021-05-06 03:15:15,902 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 [2021-05-06 03:15:15,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:15,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 03:15:15,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:15:16,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:16,068 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 03:15:16,068 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:15:16,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070353056] [2021-05-06 03:15:16,068 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:15:16,069 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1879921149] [2021-05-06 03:15:16,069 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1879921149] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:15:16,069 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:15:16,069 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 03:15:16,069 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626106604] [2021-05-06 03:15:16,070 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 03:15:16,070 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:15:16,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 03:15:16,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:15:16,073 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 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) [2021-05-06 03:15:18,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:15:18,321 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2021-05-06 03:15:18,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 03:15:18,321 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), 2 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 28 [2021-05-06 03:15:18,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:15:18,322 INFO L225 Difference]: With dead ends: 59 [2021-05-06 03:15:18,322 INFO L226 Difference]: Without dead ends: 56 [2021-05-06 03:15:18,323 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.8ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:15:18,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-06 03:15:18,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-06 03:15:18,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 33 states have (on average 1.2727272727272727) internal successors, (42), 35 states have internal predecessors, (42), 16 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 03:15:18,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 71 transitions. [2021-05-06 03:15:18,328 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 71 transitions. Word has length 28 [2021-05-06 03:15:18,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:15:18,328 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 71 transitions. [2021-05-06 03:15:18,329 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), 2 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) [2021-05-06 03:15:18,329 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 71 transitions. [2021-05-06 03:15:18,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 03:15:18,329 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:15:18,329 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:15:18,530 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:15:18,530 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:15:18,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:15:18,530 INFO L82 PathProgramCache]: Analyzing trace with hash 1301357193, now seen corresponding path program 1 times [2021-05-06 03:15:18,531 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:15:18,531 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161852429] [2021-05-06 03:15:18,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:15:18,536 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:15:18,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [6816698] [2021-05-06 03:15:18,536 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 [2021-05-06 03:15:18,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:18,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 03:15:18,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:15:18,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:18,594 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:18,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:18,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:18,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:18,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:18,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:18,650 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:18,667 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 03:15:18,667 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:15:18,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161852429] [2021-05-06 03:15:18,667 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:15:18,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6816698] [2021-05-06 03:15:18,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6816698] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:15:18,667 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:15:18,668 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 03:15:18,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141650233] [2021-05-06 03:15:18,668 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 03:15:18,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:15:18,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 03:15:18,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:15:18,669 INFO L87 Difference]: Start difference. First operand 56 states and 71 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 03:15:18,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:15:18,710 INFO L93 Difference]: Finished difference Result 76 states and 87 transitions. [2021-05-06 03:15:18,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 03:15:18,711 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2021-05-06 03:15:18,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:15:18,712 INFO L225 Difference]: With dead ends: 76 [2021-05-06 03:15:18,712 INFO L226 Difference]: Without dead ends: 69 [2021-05-06 03:15:18,713 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 11.3ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:15:18,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-06 03:15:18,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2021-05-06 03:15:18,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 42 states have (on average 1.1904761904761905) internal successors, (50), 44 states have internal predecessors, (50), 16 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-06 03:15:18,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 79 transitions. [2021-05-06 03:15:18,719 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 79 transitions. Word has length 36 [2021-05-06 03:15:18,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:15:18,719 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 79 transitions. [2021-05-06 03:15:18,719 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 03:15:18,719 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 79 transitions. [2021-05-06 03:15:18,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-06 03:15:18,719 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:15:18,720 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:15:18,926 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:15:18,926 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:15:18,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:15:18,926 INFO L82 PathProgramCache]: Analyzing trace with hash 1303085071, now seen corresponding path program 1 times [2021-05-06 03:15:18,927 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:15:18,927 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267106888] [2021-05-06 03:15:18,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:15:18,932 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:15:18,932 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2011726542] [2021-05-06 03:15:18,932 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 [2021-05-06 03:15:18,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:18,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-06 03:15:19,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:15:19,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:19,090 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:19,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:19,109 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 03:15:19,110 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:15:19,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267106888] [2021-05-06 03:15:19,110 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:15:19,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2011726542] [2021-05-06 03:15:19,110 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2011726542] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 03:15:19,110 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 03:15:19,110 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 03:15:19,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186200528] [2021-05-06 03:15:19,110 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:15:19,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:15:19,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:15:19,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:15:19,111 INFO L87 Difference]: Start difference. First operand 68 states and 79 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 03:15:19,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:15:19,233 INFO L93 Difference]: Finished difference Result 82 states and 98 transitions. [2021-05-06 03:15:19,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 03:15:19,234 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2021-05-06 03:15:19,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:15:19,235 INFO L225 Difference]: With dead ends: 82 [2021-05-06 03:15:19,235 INFO L226 Difference]: Without dead ends: 79 [2021-05-06 03:15:19,235 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 43.3ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-06 03:15:19,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-06 03:15:19,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2021-05-06 03:15:19,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 49 states have (on average 1.2040816326530612) internal successors, (59), 51 states have internal predecessors, (59), 18 states have call successors, (18), 11 states have call predecessors, (18), 10 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 03:15:19,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 93 transitions. [2021-05-06 03:15:19,241 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 93 transitions. Word has length 36 [2021-05-06 03:15:19,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:15:19,242 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 93 transitions. [2021-05-06 03:15:19,242 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, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-06 03:15:19,242 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 93 transitions. [2021-05-06 03:15:19,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-06 03:15:19,242 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:15:19,242 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 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, 1, 1] [2021-05-06 03:15:19,448 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:15:19,449 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:15:19,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:15:19,449 INFO L82 PathProgramCache]: Analyzing trace with hash -1189074514, now seen corresponding path program 1 times [2021-05-06 03:15:19,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:15:19,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274472343] [2021-05-06 03:15:19,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:15:19,455 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:15:19,455 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [949729334] [2021-05-06 03:15:19,455 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 [2021-05-06 03:15:19,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:19,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 03:15:19,509 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:15:19,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:19,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:19,531 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:19,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:19,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:19,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:19,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:19,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:19,603 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-06 03:15:19,603 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:15:19,603 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274472343] [2021-05-06 03:15:19,603 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:15:19,603 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [949729334] [2021-05-06 03:15:19,603 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [949729334] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:15:19,604 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:15:19,604 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-06 03:15:19,604 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370852482] [2021-05-06 03:15:19,604 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 03:15:19,604 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:15:19,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 03:15:19,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 03:15:19,605 INFO L87 Difference]: Start difference. First operand 78 states and 93 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 03:15:19,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:15:19,651 INFO L93 Difference]: Finished difference Result 94 states and 115 transitions. [2021-05-06 03:15:19,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 03:15:19,652 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2021-05-06 03:15:19,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:15:19,653 INFO L225 Difference]: With dead ends: 94 [2021-05-06 03:15:19,653 INFO L226 Difference]: Without dead ends: 80 [2021-05-06 03:15:19,654 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 19.1ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:15:19,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-05-06 03:15:19,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 80. [2021-05-06 03:15:19,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 51 states have (on average 1.196078431372549) internal successors, (61), 53 states have internal predecessors, (61), 18 states have call successors, (18), 11 states have call predecessors, (18), 10 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-06 03:15:19,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 95 transitions. [2021-05-06 03:15:19,661 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 95 transitions. Word has length 38 [2021-05-06 03:15:19,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:15:19,661 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 95 transitions. [2021-05-06 03:15:19,661 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-06 03:15:19,661 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 95 transitions. [2021-05-06 03:15:19,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-06 03:15:19,662 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:15:19,662 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:15:19,881 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:15:19,881 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:15:19,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:15:19,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890039, now seen corresponding path program 1 times [2021-05-06 03:15:19,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:15:19,882 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076477627] [2021-05-06 03:15:19,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:15:19,887 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:15:19,887 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [108611230] [2021-05-06 03:15:19,887 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 [2021-05-06 03:15:20,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:20,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-06 03:15:20,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:15:20,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:20,103 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-06 03:15:20,103 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:15:20,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076477627] [2021-05-06 03:15:20,103 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:15:20,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108611230] [2021-05-06 03:15:20,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108611230] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:15:20,104 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:15:20,104 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 03:15:20,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521600773] [2021-05-06 03:15:20,104 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:15:20,104 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:15:20,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:15:20,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:15:20,105 INFO L87 Difference]: Start difference. First operand 80 states and 95 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-06 03:15:22,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:15:22,393 INFO L93 Difference]: Finished difference Result 103 states and 127 transitions. [2021-05-06 03:15:22,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 03:15:22,394 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2021-05-06 03:15:22,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:15:22,395 INFO L225 Difference]: With dead ends: 103 [2021-05-06 03:15:22,395 INFO L226 Difference]: Without dead ends: 95 [2021-05-06 03:15:22,395 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.1ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:15:22,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2021-05-06 03:15:22,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 93. [2021-05-06 03:15:22,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 58 states have (on average 1.206896551724138) internal successors, (70), 60 states have internal predecessors, (70), 23 states have call successors, (23), 12 states have call predecessors, (23), 11 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-06 03:15:22,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 114 transitions. [2021-05-06 03:15:22,405 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 114 transitions. Word has length 46 [2021-05-06 03:15:22,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:15:22,406 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 114 transitions. [2021-05-06 03:15:22,406 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, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-06 03:15:22,406 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 114 transitions. [2021-05-06 03:15:22,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 03:15:22,407 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:15:22,407 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 03:15:22,608 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 03:15:22,609 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:15:22,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:15:22,609 INFO L82 PathProgramCache]: Analyzing trace with hash -399036107, now seen corresponding path program 1 times [2021-05-06 03:15:22,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:15:22,609 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1336215137] [2021-05-06 03:15:22,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:15:22,615 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:15:22,615 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [786262892] [2021-05-06 03:15:22,615 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 [2021-05-06 03:15:22,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 03:15:22,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-06 03:15:22,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 03:15:22,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:22,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:22,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:22,699 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:22,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:22,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:22,727 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:22,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:22,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:22,764 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:22,766 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 03:15:22,777 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-06 03:15:22,777 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 03:15:22,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1336215137] [2021-05-06 03:15:22,777 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 03:15:22,777 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [786262892] [2021-05-06 03:15:22,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [786262892] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 03:15:22,777 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 03:15:22,777 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-06 03:15:22,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421806964] [2021-05-06 03:15:22,778 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 03:15:22,778 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 03:15:22,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 03:15:22,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-06 03:15:22,780 INFO L87 Difference]: Start difference. First operand 93 states and 114 transitions. Second operand has 6 states, 6 states have (on average 4.166666666666667) internal successors, (25), 5 states have internal predecessors, (25), 5 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-06 03:15:22,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 03:15:22,887 INFO L93 Difference]: Finished difference Result 128 states and 148 transitions. [2021-05-06 03:15:22,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 03:15:22,887 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), 5 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 50 [2021-05-06 03:15:22,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 03:15:22,888 INFO L225 Difference]: With dead ends: 128 [2021-05-06 03:15:22,888 INFO L226 Difference]: Without dead ends: 115 [2021-05-06 03:15:22,889 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 23.3ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-06 03:15:22,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-05-06 03:15:22,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2021-05-06 03:15:22,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 75 states have (on average 1.16) internal successors, (87), 77 states have internal predecessors, (87), 23 states have call successors, (23), 16 states have call predecessors, (23), 15 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-06 03:15:22,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 131 transitions. [2021-05-06 03:15:22,896 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 131 transitions. Word has length 50 [2021-05-06 03:15:22,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 03:15:22,896 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 131 transitions. [2021-05-06 03:15:22,896 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), 5 states have call successors, (9), 5 states have call predecessors, (9), 3 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-06 03:15:22,896 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 131 transitions. [2021-05-06 03:15:22,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-06 03:15:22,897 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 03:15:22,897 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 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, 1, 1, 1, 1] [2021-05-06 03:15:23,108 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-06 03:15:23,109 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 03:15:23,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 03:15:23,109 INFO L82 PathProgramCache]: Analyzing trace with hash -397308229, now seen corresponding path program 1 times [2021-05-06 03:15:23,109 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 03:15:23,109 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907178215] [2021-05-06 03:15:23,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 03:15:23,115 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 03:15:23,115 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1660991434] [2021-05-06 03:15:23,115 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