/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/geo1-ll_unwindbound100.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 15:20:08,168 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 15:20:08,170 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 15:20:08,195 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 15:20:08,195 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 15:20:08,196 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 15:20:08,198 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 15:20:08,199 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 15:20:08,201 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 15:20:08,202 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 15:20:08,203 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 15:20:08,204 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 15:20:08,205 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 15:20:08,206 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 15:20:08,206 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 15:20:08,208 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 15:20:08,208 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 15:20:08,209 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 15:20:08,210 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 15:20:08,212 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 15:20:08,213 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 15:20:08,214 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 15:20:08,215 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 15:20:08,216 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 15:20:08,219 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 15:20:08,219 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 15:20:08,219 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 15:20:08,220 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 15:20:08,220 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 15:20:08,221 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 15:20:08,222 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 15:20:08,222 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 15:20:08,223 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 15:20:08,224 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 15:20:08,225 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 15:20:08,225 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 15:20:08,226 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 15:20:08,226 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 15:20:08,226 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 15:20:08,227 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 15:20:08,228 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 15:20:08,246 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 15:20:08,273 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 15:20:08,273 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 15:20:08,274 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 15:20:08,275 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 15:20:08,275 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 15:20:08,275 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 15:20:08,275 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 15:20:08,275 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 15:20:08,275 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 15:20:08,276 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 15:20:08,276 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 15:20:08,276 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 15:20:08,276 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 15:20:08,276 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 15:20:08,276 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 15:20:08,276 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 15:20:08,277 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 15:20:08,277 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 15:20:08,277 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 15:20:08,277 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 15:20:08,277 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 15:20:08,277 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 15:20:08,278 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 15:20:08,278 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 15:20:08,278 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 15:20:08,278 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 15:20:08,278 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 15:20:08,278 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 15:20:08,278 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 15:20:08,551 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 15:20:08,580 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 15:20:08,583 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 15:20:08,583 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 15:20:08,584 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 15:20:08,585 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/geo1-ll_unwindbound100.c [2021-05-02 15:20:08,657 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/732d1f497/377571d8dd914a078adfe917847bb16f/FLAGffd1bcaba [2021-05-02 15:20:09,097 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 15:20:09,098 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/geo1-ll_unwindbound100.c [2021-05-02 15:20:09,105 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/732d1f497/377571d8dd914a078adfe917847bb16f/FLAGffd1bcaba [2021-05-02 15:20:09,507 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/732d1f497/377571d8dd914a078adfe917847bb16f [2021-05-02 15:20:09,509 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 15:20:09,510 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 15:20:09,512 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 15:20:09,512 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 15:20:09,515 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 15:20:09,516 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:20:09" (1/1) ... [2021-05-02 15:20:09,516 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2018d0d5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:20:09, skipping insertion in model container [2021-05-02 15:20:09,517 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:20:09" (1/1) ... [2021-05-02 15:20:09,522 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 15:20:09,534 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 15:20:09,686 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/geo1-ll_unwindbound100.c[546,559] [2021-05-02 15:20:09,707 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:20:09,715 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 15:20:09,727 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/geo1-ll_unwindbound100.c[546,559] [2021-05-02 15:20:09,737 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:20:09,753 INFO L208 MainTranslator]: Completed translation [2021-05-02 15:20:09,754 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:20:09 WrapperNode [2021-05-02 15:20:09,754 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 15:20:09,756 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 15:20:09,761 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 15:20:09,762 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 15:20:09,774 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:20:09" (1/1) ... [2021-05-02 15:20:09,775 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:20:09" (1/1) ... [2021-05-02 15:20:09,781 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:20:09" (1/1) ... [2021-05-02 15:20:09,781 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:20:09" (1/1) ... [2021-05-02 15:20:09,792 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:20:09" (1/1) ... [2021-05-02 15:20:09,797 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:20:09" (1/1) ... [2021-05-02 15:20:09,802 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:20:09" (1/1) ... [2021-05-02 15:20:09,805 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 15:20:09,807 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 15:20:09,807 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 15:20:09,807 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 15:20:09,807 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:20:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 15:20:09,927 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 15:20:09,928 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 15:20:09,928 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 15:20:09,928 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 15:20:09,928 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 15:20:09,928 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 15:20:09,929 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 15:20:09,929 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 15:20:09,929 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 15:20:09,929 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 15:20:09,930 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 15:20:09,930 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 15:20:09,930 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 15:20:09,930 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 15:20:09,931 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 15:20:09,931 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 15:20:09,931 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 15:20:09,931 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 15:20:09,931 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 15:20:09,932 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 15:20:10,218 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 15:20:10,218 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 15:20:10,219 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:20:10 BoogieIcfgContainer [2021-05-02 15:20:10,220 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 15:20:10,221 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 15:20:10,221 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 15:20:10,223 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 15:20:10,223 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 03:20:09" (1/3) ... [2021-05-02 15:20:10,224 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d0d2517 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:20:10, skipping insertion in model container [2021-05-02 15:20:10,224 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:20:09" (2/3) ... [2021-05-02 15:20:10,224 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5d0d2517 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:20:10, skipping insertion in model container [2021-05-02 15:20:10,224 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:20:10" (3/3) ... [2021-05-02 15:20:10,225 INFO L111 eAbstractionObserver]: Analyzing ICFG geo1-ll_unwindbound100.c [2021-05-02 15:20:10,230 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 15:20:10,232 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 15:20:10,245 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 15:20:10,264 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 15:20:10,264 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 15:20:10,264 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 15:20:10,264 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 15:20:10,264 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 15:20:10,264 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 15:20:10,265 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 15:20:10,265 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 15:20:10,277 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 15:20:10,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 15:20:10,281 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:20:10,282 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:20:10,282 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:20:10,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:20:10,286 INFO L82 PathProgramCache]: Analyzing trace with hash 730417173, now seen corresponding path program 1 times [2021-05-02 15:20:10,294 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:20:10,294 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207916430] [2021-05-02 15:20:10,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:20:10,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:20:10,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:20:10,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:20:10,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:20:10,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:20:10,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 15:20:10,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:20:10,603 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:20:10,603 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:20:10,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207916430] [2021-05-02 15:20:10,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207916430] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:20:10,605 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:20:10,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 15:20:10,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646519784] [2021-05-02 15:20:10,610 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 15:20:10,610 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:20:10,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 15:20:10,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 15:20:10,621 INFO L87 Difference]: Start difference. First operand has 30 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:20:10,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:20:10,686 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2021-05-02 15:20:10,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 15:20:10,687 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 15:20:10,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:20:10,693 INFO L225 Difference]: With dead ends: 54 [2021-05-02 15:20:10,693 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 15:20:10,696 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 80.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 15:20:10,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 15:20:10,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2021-05-02 15:20:10,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 15:20:10,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-02 15:20:10,725 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 23 [2021-05-02 15:20:10,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:20:10,726 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-02 15:20:10,726 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:20:10,726 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-02 15:20:10,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 15:20:10,727 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:20:10,728 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:20:10,728 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 15:20:10,728 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:20:10,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:20:10,729 INFO L82 PathProgramCache]: Analyzing trace with hash -942473515, now seen corresponding path program 1 times [2021-05-02 15:20:10,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:20:10,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368075756] [2021-05-02 15:20:10,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:20:10,745 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:20:10,746 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2026558835] [2021-05-02 15:20:10,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:10,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:20:10,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 15:20:10,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:20:10,934 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:10,939 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:10,976 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:10,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:11,009 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 15:20:11,010 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:20:11,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368075756] [2021-05-02 15:20:11,010 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:20:11,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026558835] [2021-05-02 15:20:11,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026558835] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:20:11,011 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:20:11,011 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:20:11,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402795900] [2021-05-02 15:20:11,012 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:20:11,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:20:11,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:20:11,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:20:11,013 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:20:11,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:20:11,143 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-05-02 15:20:11,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:20:11,144 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-02 15:20:11,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:20:11,145 INFO L225 Difference]: With dead ends: 36 [2021-05-02 15:20:11,145 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 15:20:11,146 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 79.8ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:20:11,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 15:20:11,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2021-05-02 15:20:11,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 15:20:11,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2021-05-02 15:20:11,165 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 23 [2021-05-02 15:20:11,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:20:11,166 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2021-05-02 15:20:11,166 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:20:11,166 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2021-05-02 15:20:11,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-02 15:20:11,167 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:20:11,167 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:20:11,389 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 15:20:11,389 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:20:11,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:20:11,390 INFO L82 PathProgramCache]: Analyzing trace with hash 769172850, now seen corresponding path program 1 times [2021-05-02 15:20:11,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:20:11,390 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813206641] [2021-05-02 15:20:11,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:20:11,402 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:20:11,402 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1168520943] [2021-05-02 15:20:11,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:11,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:20:11,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 15:20:11,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:20:11,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:11,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:11,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:11,521 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:11,524 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:11,537 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:20:11,537 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:20:11,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813206641] [2021-05-02 15:20:11,537 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:20:11,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1168520943] [2021-05-02 15:20:11,538 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1168520943] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:20:11,538 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:20:11,538 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 15:20:11,538 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619638995] [2021-05-02 15:20:11,538 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 15:20:11,539 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:20:11,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 15:20:11,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:20:11,539 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:20:11,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:20:11,550 INFO L93 Difference]: Finished difference Result 40 states and 43 transitions. [2021-05-02 15:20:11,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 15:20:11,551 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-05-02 15:20:11,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:20:11,553 INFO L225 Difference]: With dead ends: 40 [2021-05-02 15:20:11,553 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 15:20:11,553 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.1ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:20:11,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 15:20:11,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 15:20:11,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.15) internal successors, (23), 22 states have internal predecessors, (23), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 15:20:11,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2021-05-02 15:20:11,563 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 24 [2021-05-02 15:20:11,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:20:11,563 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2021-05-02 15:20:11,563 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.25) internal successors, (13), 3 states have internal predecessors, (13), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 15:20:11,563 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2021-05-02 15:20:11,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-05-02 15:20:11,564 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:20:11,564 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:20:11,764 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:11,765 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:20:11,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:20:11,765 INFO L82 PathProgramCache]: Analyzing trace with hash 431121724, now seen corresponding path program 1 times [2021-05-02 15:20:11,765 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:20:11,765 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771967471] [2021-05-02 15:20:11,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:20:11,777 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:20:11,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1197927352] [2021-05-02 15:20:11,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:11,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:20:11,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 15:20:11,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:20:11,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:11,928 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:11,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:11,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:11,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:11,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:11,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:11,999 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:12,003 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:12,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:12,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:12,020 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:12,022 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:12,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:12,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:12,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:12,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:12,074 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 15:20:12,074 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:20:12,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771967471] [2021-05-02 15:20:12,074 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:20:12,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1197927352] [2021-05-02 15:20:12,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1197927352] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:20:12,075 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:20:12,075 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 15:20:12,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208527616] [2021-05-02 15:20:12,075 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 15:20:12,075 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:20:12,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 15:20:12,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:20:12,076 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 11 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:20:14,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:20:14,238 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2021-05-02 15:20:14,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:20:14,240 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 30 [2021-05-02 15:20:14,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:20:14,241 INFO L225 Difference]: With dead ends: 40 [2021-05-02 15:20:14,241 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 15:20:14,242 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 101.7ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-02 15:20:14,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 15:20:14,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-05-02 15:20:14,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 20 states have (on average 1.1) internal successors, (22), 22 states have internal predecessors, (22), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 15:20:14,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-05-02 15:20:14,248 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 30 [2021-05-02 15:20:14,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:20:14,248 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-05-02 15:20:14,248 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.0) internal successors, (20), 10 states have internal predecessors, (20), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:20:14,248 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-05-02 15:20:14,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 15:20:14,249 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:20:14,249 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:20:14,457 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:14,457 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:20:14,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:20:14,457 INFO L82 PathProgramCache]: Analyzing trace with hash 1792638864, now seen corresponding path program 1 times [2021-05-02 15:20:14,458 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:20:14,458 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710903496] [2021-05-02 15:20:14,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:20:14,469 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:20:14,469 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1732096184] [2021-05-02 15:20:14,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:14,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:20:14,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 15:20:14,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:20:14,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:14,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:14,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:14,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:14,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:14,621 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:14,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:14,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:14,676 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 15:20:14,677 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:20:14,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710903496] [2021-05-02 15:20:14,677 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:20:14,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1732096184] [2021-05-02 15:20:14,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1732096184] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:20:14,677 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:20:14,677 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 15:20:14,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789920348] [2021-05-02 15:20:14,678 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:20:14,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:20:14,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:20:14,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:20:14,678 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:20:14,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:20:14,796 INFO L93 Difference]: Finished difference Result 44 states and 47 transitions. [2021-05-02 15:20:14,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:20:14,797 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 31 [2021-05-02 15:20:14,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:20:14,799 INFO L225 Difference]: With dead ends: 44 [2021-05-02 15:20:14,799 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 15:20:14,802 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 71.9ms TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:20:14,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 15:20:14,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-02 15:20:14,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 28 states have internal predecessors, (29), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 15:20:14,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-05-02 15:20:14,820 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 31 [2021-05-02 15:20:14,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:20:14,821 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-05-02 15:20:14,821 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 15:20:14,821 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-05-02 15:20:14,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 15:20:14,823 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:20:14,823 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:20:15,043 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:15,043 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:20:15,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:20:15,044 INFO L82 PathProgramCache]: Analyzing trace with hash -341689321, now seen corresponding path program 1 times [2021-05-02 15:20:15,044 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:20:15,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [428333540] [2021-05-02 15:20:15,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:20:15,054 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:20:15,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1502434618] [2021-05-02 15:20:15,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:15,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:20:15,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 15:20:15,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:20:15,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,121 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,122 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,194 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:20:15,194 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:20:15,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [428333540] [2021-05-02 15:20:15,194 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:20:15,194 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1502434618] [2021-05-02 15:20:15,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1502434618] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:20:15,194 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:20:15,195 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 15:20:15,195 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516016343] [2021-05-02 15:20:15,195 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 15:20:15,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:20:15,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 15:20:15,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:20:15,196 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:20:15,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:20:15,249 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-05-02 15:20:15,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 15:20:15,249 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 32 [2021-05-02 15:20:15,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:20:15,250 INFO L225 Difference]: With dead ends: 48 [2021-05-02 15:20:15,250 INFO L226 Difference]: Without dead ends: 40 [2021-05-02 15:20:15,250 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 15.7ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:20:15,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-05-02 15:20:15,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-05-02 15:20:15,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 28 states have internal predecessors, (28), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 15:20:15,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-05-02 15:20:15,257 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 32 [2021-05-02 15:20:15,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:20:15,257 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-05-02 15:20:15,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:20:15,258 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-05-02 15:20:15,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 15:20:15,258 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:20:15,258 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:20:15,477 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 15:20:15,477 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:20:15,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:20:15,478 INFO L82 PathProgramCache]: Analyzing trace with hash 761075019, now seen corresponding path program 2 times [2021-05-02 15:20:15,478 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:20:15,478 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329145572] [2021-05-02 15:20:15,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:20:15,491 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:20:15,491 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [347900852] [2021-05-02 15:20:15,491 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:15,567 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:20:15,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:20:15,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 15:20:15,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:20:15,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,640 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,685 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:15,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:21,793 WARN L205 SmtUtils]: Spent 4.04 s on a formula simplification that was a NOOP. DAG size: 18 [2021-05-02 15:20:21,796 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:21,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:21,838 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:21,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:21,875 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 9 proven. 11 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-05-02 15:20:21,875 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:20:21,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329145572] [2021-05-02 15:20:21,875 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:20:21,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347900852] [2021-05-02 15:20:21,875 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [347900852] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:20:21,875 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:20:21,875 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 15:20:21,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335901813] [2021-05-02 15:20:21,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 15:20:21,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:20:21,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 15:20:21,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=127, Unknown=1, NotChecked=0, Total=156 [2021-05-02 15:20:21,877 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 10 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:20:36,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:20:36,247 INFO L93 Difference]: Finished difference Result 52 states and 55 transitions. [2021-05-02 15:20:36,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 15:20:36,248 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 10 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) Word has length 39 [2021-05-02 15:20:36,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:20:36,249 INFO L225 Difference]: With dead ends: 52 [2021-05-02 15:20:36,249 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 15:20:36,249 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 6204.5ms TimeCoverageRelationStatistics Valid=47, Invalid=224, Unknown=1, NotChecked=0, Total=272 [2021-05-02 15:20:36,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 15:20:36,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2021-05-02 15:20:36,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 32 states have (on average 1.09375) internal successors, (35), 34 states have internal predecessors, (35), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 15:20:36,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2021-05-02 15:20:36,255 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 39 [2021-05-02 15:20:36,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:20:36,256 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2021-05-02 15:20:36,256 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 10 states have internal predecessors, (27), 4 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:20:36,256 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2021-05-02 15:20:36,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-05-02 15:20:36,257 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:20:36,257 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:20:36,473 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:36,473 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:20:36,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:20:36,473 INFO L82 PathProgramCache]: Analyzing trace with hash 2039569852, now seen corresponding path program 2 times [2021-05-02 15:20:36,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:20:36,474 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131582794] [2021-05-02 15:20:36,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:20:36,484 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:20:36,484 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1489939765] [2021-05-02 15:20:36,484 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:36,532 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:20:36,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:20:36,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 15:20:36,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:20:36,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:36,556 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:36,557 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:36,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:36,587 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:36,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:36,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:36,611 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:36,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:36,630 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:36,632 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:36,643 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 15:20:36,643 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:20:36,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131582794] [2021-05-02 15:20:36,643 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:20:36,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489939765] [2021-05-02 15:20:36,644 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489939765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:20:36,644 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:20:36,644 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 15:20:36,644 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778217120] [2021-05-02 15:20:36,644 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:20:36,644 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:20:36,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:20:36,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:20:36,645 INFO L87 Difference]: Start difference. First operand 48 states and 51 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, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:20:36,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:20:36,700 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2021-05-02 15:20:36,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:20:36,701 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, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 40 [2021-05-02 15:20:36,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:20:36,702 INFO L225 Difference]: With dead ends: 56 [2021-05-02 15:20:36,702 INFO L226 Difference]: Without dead ends: 48 [2021-05-02 15:20:36,703 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 26.7ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:20:36,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-05-02 15:20:36,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-05-02 15:20:36,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 32 states have (on average 1.0625) internal successors, (34), 34 states have internal predecessors, (34), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 15:20:36,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2021-05-02 15:20:36,710 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 40 [2021-05-02 15:20:36,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:20:36,710 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2021-05-02 15:20:36,711 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, (7), 5 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 15:20:36,711 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2021-05-02 15:20:36,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 15:20:36,712 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:20:36,712 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:20:36,924 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:36,925 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:20:36,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:20:36,925 INFO L82 PathProgramCache]: Analyzing trace with hash -545734650, now seen corresponding path program 3 times [2021-05-02 15:20:36,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:20:36,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389106823] [2021-05-02 15:20:36,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:20:36,936 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:20:36,936 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1147921255] [2021-05-02 15:20:36,936 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:20:36,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 15:20:36,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:20:36,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 15:20:36,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:20:37,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:37,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:37,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:37,274 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:37,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:37,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:37,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:37,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:37,290 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:39,321 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:39,323 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:39,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:39,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:39,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:39,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:39,342 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:39,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:39,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:39,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:41,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:41,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:41,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:41,384 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:20:43,460 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 22 proven. 1 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-05-02 15:20:43,460 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:20:43,460 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389106823] [2021-05-02 15:20:43,461 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:20:43,461 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147921255] [2021-05-02 15:20:43,461 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1147921255] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:20:43,461 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:20:43,461 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 15:20:43,461 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105520464] [2021-05-02 15:20:43,461 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:20:43,461 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:20:43,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:20:43,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:20:43,462 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-05-02 15:20:58,383 WARN L205 SmtUtils]: Spent 14.91 s on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2021-05-02 15:21:00,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:21:00,521 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-05-02 15:21:00,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:21:00,522 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 47 [2021-05-02 15:21:00,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:21:00,523 INFO L225 Difference]: With dead ends: 48 [2021-05-02 15:21:00,523 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 15:21:00,523 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 15180.3ms TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:21:00,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 15:21:00,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 15:21:00,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 15:21:00,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 15:21:00,524 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 47 [2021-05-02 15:21:00,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:21:00,524 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 15:21:00,524 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 3.142857142857143) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2021-05-02 15:21:00,524 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 15:21:00,524 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 15:21:00,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 15:21:00,726 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 15:21:02,973 WARN L205 SmtUtils]: Spent 2.07 s on a formula simplification. DAG size of input: 52 DAG size of output: 24 [2021-05-02 15:21:03,027 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 9) no Hoare annotation was computed. [2021-05-02 15:21:03,028 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 9) no Hoare annotation was computed. [2021-05-02 15:21:03,028 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 9) no Hoare annotation was computed. [2021-05-02 15:21:03,028 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-02 15:21:03,028 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= ~counter~0 |old(~counter~0)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-02 15:21:03,028 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-02 15:21:03,028 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-02 15:21:03,028 INFO L194 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: (<= ~counter~0 0) [2021-05-02 15:21:03,028 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-02 15:21:03,028 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-02 15:21:03,029 INFO L201 CegarLoopUtils]: At program point assume_abort_if_notENTRY(lines 12 14) the Hoare annotation is: true [2021-05-02 15:21:03,029 INFO L198 CegarLoopUtils]: For program point L13(line 13) no Hoare annotation was computed. [2021-05-02 15:21:03,029 INFO L198 CegarLoopUtils]: For program point L13-2(lines 12 14) no Hoare annotation was computed. [2021-05-02 15:21:03,029 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notEXIT(lines 12 14) no Hoare annotation was computed. [2021-05-02 15:21:03,029 INFO L194 CegarLoopUtils]: At program point L35-3(lines 35 45) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (let ((.cse0 (+ main_~x~0 (- 1)))) (and (<= 1 main_~k~0) (= (mod .cse0 main_~z~0) 0) (let ((.cse1 (div .cse0 main_~z~0))) (= (+ main_~y~0 (* main_~z~0 .cse1)) (+ main_~z~0 (* main_~z~0 main_~z~0 .cse1)))) (<= 1 main_~z~0)))) [2021-05-02 15:21:03,029 INFO L198 CegarLoopUtils]: For program point L35-4(lines 35 45) no Hoare annotation was computed. [2021-05-02 15:21:03,029 INFO L198 CegarLoopUtils]: For program point L29(line 29) no Hoare annotation was computed. [2021-05-02 15:21:03,029 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 23 51) no Hoare annotation was computed. [2021-05-02 15:21:03,029 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 23 51) no Hoare annotation was computed. [2021-05-02 15:21:03,029 INFO L194 CegarLoopUtils]: At program point L36(line 36) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (let ((.cse0 (+ main_~x~0 (- 1)))) (and (<= 1 main_~k~0) (= (mod .cse0 main_~z~0) 0) (let ((.cse1 (div .cse0 main_~z~0))) (= (+ main_~y~0 (* main_~z~0 .cse1)) (+ main_~z~0 (* main_~z~0 main_~z~0 .cse1)))) (<= 1 main_~z~0)))) [2021-05-02 15:21:03,029 INFO L198 CegarLoopUtils]: For program point L36-1(lines 35 45) no Hoare annotation was computed. [2021-05-02 15:21:03,029 INFO L194 CegarLoopUtils]: At program point mainENTRY(lines 23 51) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (= ~counter~0 |old(~counter~0)|)) [2021-05-02 15:21:03,029 INFO L194 CegarLoopUtils]: At program point L28(line 28) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (= ~counter~0 |old(~counter~0)|)) [2021-05-02 15:21:03,030 INFO L194 CegarLoopUtils]: At program point L28-1(line 28) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (and (<= 1 main_~z~0) (= ~counter~0 |old(~counter~0)|))) [2021-05-02 15:21:03,030 INFO L194 CegarLoopUtils]: At program point L49(line 49) the Hoare annotation is: (let ((.cse0 (<= 1 main_~z~0))) (or (not (<= |old(~counter~0)| 0)) (and (<= 1 main_~k~0) .cse0) (and (exists ((v_main_~x~0_11 Int) (main_~z~0 Int)) (let ((.cse1 (* v_main_~x~0_11 main_~z~0))) (and (<= 1 main_~z~0) (= .cse1 (+ v_main_~x~0_11 main_~x~0)) (= (+ .cse1 1) (+ v_main_~x~0_11 main_~y~0))))) .cse0))) [2021-05-02 15:21:03,030 INFO L198 CegarLoopUtils]: For program point L49-1(line 49) no Hoare annotation was computed. [2021-05-02 15:21:03,030 INFO L198 CegarLoopUtils]: For program point L35-1(lines 35 45) no Hoare annotation was computed. [2021-05-02 15:21:03,030 INFO L198 CegarLoopUtils]: For program point L17(lines 17 18) no Hoare annotation was computed. [2021-05-02 15:21:03,030 INFO L198 CegarLoopUtils]: For program point L16(lines 16 19) no Hoare annotation was computed. [2021-05-02 15:21:03,030 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 15 21) the Hoare annotation is: true [2021-05-02 15:21:03,030 INFO L198 CegarLoopUtils]: For program point L16-2(lines 15 21) no Hoare annotation was computed. [2021-05-02 15:21:03,030 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertEXIT(lines 15 21) no Hoare annotation was computed. [2021-05-02 15:21:03,030 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 18) no Hoare annotation was computed. [2021-05-02 15:21:03,041 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 03:21:03 BoogieIcfgContainer [2021-05-02 15:21:03,042 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 15:21:03,042 INFO L168 Benchmark]: Toolchain (without parser) took 53531.98 ms. Allocated memory was 220.2 MB in the beginning and 277.9 MB in the end (delta: 57.7 MB). Free memory was 185.6 MB in the beginning and 163.9 MB in the end (delta: 21.7 MB). Peak memory consumption was 80.2 MB. Max. memory is 8.0 GB. [2021-05-02 15:21:03,042 INFO L168 Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 220.2 MB. Free memory is still 202.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 15:21:03,042 INFO L168 Benchmark]: CACSL2BoogieTranslator took 243.06 ms. Allocated memory is still 220.2 MB. Free memory was 185.4 MB in the beginning and 175.7 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 15:21:03,043 INFO L168 Benchmark]: Boogie Preprocessor took 49.06 ms. Allocated memory is still 220.2 MB. Free memory was 175.7 MB in the beginning and 174.2 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 15:21:03,043 INFO L168 Benchmark]: RCFGBuilder took 413.11 ms. Allocated memory is still 220.2 MB. Free memory was 174.2 MB in the beginning and 190.5 MB in the end (delta: -16.3 MB). Peak memory consumption was 5.4 MB. Max. memory is 8.0 GB. [2021-05-02 15:21:03,043 INFO L168 Benchmark]: TraceAbstraction took 52820.93 ms. Allocated memory was 220.2 MB in the beginning and 277.9 MB in the end (delta: 57.7 MB). Free memory was 189.9 MB in the beginning and 163.9 MB in the end (delta: 26.0 MB). Peak memory consumption was 85.2 MB. Max. memory is 8.0 GB. [2021-05-02 15:21:03,043 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.15 ms. Allocated memory is still 220.2 MB. Free memory is still 202.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 243.06 ms. Allocated memory is still 220.2 MB. Free memory was 185.4 MB in the beginning and 175.7 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 49.06 ms. Allocated memory is still 220.2 MB. Free memory was 175.7 MB in the beginning and 174.2 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 413.11 ms. Allocated memory is still 220.2 MB. Free memory was 174.2 MB in the beginning and 190.5 MB in the end (delta: -16.3 MB). Peak memory consumption was 5.4 MB. Max. memory is 8.0 GB. * TraceAbstraction took 52820.93 ms. Allocated memory was 220.2 MB in the beginning and 277.9 MB in the end (delta: 57.7 MB). Free memory was 189.9 MB in the beginning and 163.9 MB in the end (delta: 26.0 MB). Peak memory consumption was 85.2 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 18]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 50463.2ms, OverallIterations: 9, TraceHistogramMax: 4, EmptinessCheckTime: 14.5ms, AutomataDifference: 34070.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 2302.0ms, InitialAbstractionConstructionTime: 9.6ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 213 SDtfs, 126 SDslu, 793 SDs, 0 SdLazy, 473 SolverSat, 50 SolverUnsat, 9 SolverUnknown, 0 SolverNotchecked, 18508.6ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 288 GetRequests, 219 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 21767.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=48occurred in iteration=7, InterpolantAutomatonStates: 70, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 89.9ms AutomataMinimizationTime, 9 MinimizatonAttempts, 7 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 11 LocationsWithAnnotation, 23 PreInvPairs, 34 NumberOfFragments, 183 HoareAnnotationTreeSize, 23 FomulaSimplifications, 78 FormulaSimplificationTreeSizeReduction, 54.7ms HoareSimplificationTime, 11 FomulaSimplificationsInter, 726 FormulaSimplificationTreeSizeReductionInter, 2239.3ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 114.1ms SsaConstructionTime, 236.8ms SatisfiabilityAnalysisTime, 13800.3ms InterpolantComputationTime, 289 NumberOfCodeBlocks, 273 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 280 ConstructedInterpolants, 1 QuantifiedInterpolants, 1002 SizeOfPredicates, 22 NumberOfNonLiveVariables, 1181 ConjunctsInSsa, 127 ConjunctsInUnsatCore, 9 InterpolantComputations, 2 PerfectInterpolantSequences, 84/120 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 35]: Loop Invariant Derived loop invariant: !(\old(counter) <= 0) || (((1 <= k && (x + -1) % z == 0) && y + z * ((x + -1) / z) == z + z * z * ((x + -1) / z)) && 1 <= z) RESULT: Ultimate proved your program to be correct! Received shutdown request...