/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/sqrt1-ll.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 13:52:44,283 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 13:52:44,285 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 13:52:44,317 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 13:52:44,318 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 13:52:44,320 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 13:52:44,322 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 13:52:44,326 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 13:52:44,327 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 13:52:44,330 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 13:52:44,331 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 13:52:44,332 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 13:52:44,332 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 13:52:44,334 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 13:52:44,335 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 13:52:44,336 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 13:52:44,338 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 13:52:44,339 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 13:52:44,340 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 13:52:44,345 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 13:52:44,348 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 13:52:44,348 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 13:52:44,349 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 13:52:44,351 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 13:52:44,354 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 13:52:44,354 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 13:52:44,354 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 13:52:44,355 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 13:52:44,355 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 13:52:44,355 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 13:52:44,355 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 13:52:44,356 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 13:52:44,356 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 13:52:44,357 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 13:52:44,357 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 13:52:44,357 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 13:52:44,358 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 13:52:44,358 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 13:52:44,358 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 13:52:44,359 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 13:52:44,359 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 13:52:44,360 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 13:52:44,374 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 13:52:44,374 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 13:52:44,375 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 13:52:44,375 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 13:52:44,375 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 13:52:44,375 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 13:52:44,375 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 13:52:44,375 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 13:52:44,375 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 13:52:44,376 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 13:52:44,376 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 13:52:44,376 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 13:52:44,376 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 13:52:44,376 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 13:52:44,376 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 13:52:44,376 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 13:52:44,376 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 13:52:44,377 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 13:52:44,377 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 13:52:44,377 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 13:52:44,377 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 13:52:44,377 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 13:52:44,377 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 13:52:44,377 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 13:52:44,377 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 13:52:44,377 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 13:52:44,377 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 13:52:44,378 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 13:52:44,378 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 13:52:44,638 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 13:52:44,659 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 13:52:44,661 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 13:52:44,662 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 13:52:44,662 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 13:52:44,663 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/sqrt1-ll.c [2021-05-02 13:52:44,715 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f7e4efabc/cee005f099b64a0d98ccbfaa728bd98d/FLAG05855aa06 [2021-05-02 13:52:45,076 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 13:52:45,076 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/sqrt1-ll.c [2021-05-02 13:52:45,080 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f7e4efabc/cee005f099b64a0d98ccbfaa728bd98d/FLAG05855aa06 [2021-05-02 13:52:45,091 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f7e4efabc/cee005f099b64a0d98ccbfaa728bd98d [2021-05-02 13:52:45,093 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 13:52:45,094 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 13:52:45,095 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 13:52:45,095 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 13:52:45,097 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 13:52:45,097 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:52:45" (1/1) ... [2021-05-02 13:52:45,098 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6bd0aa46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:52:45, skipping insertion in model container [2021-05-02 13:52:45,098 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 01:52:45" (1/1) ... [2021-05-02 13:52:45,102 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 13:52:45,110 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 13:52:45,197 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/sqrt1-ll.c[520,533] [2021-05-02 13:52:45,213 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:52:45,218 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 13:52:45,259 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/sqrt1-ll.c[520,533] [2021-05-02 13:52:45,272 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 13:52:45,282 INFO L208 MainTranslator]: Completed translation [2021-05-02 13:52:45,283 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:52:45 WrapperNode [2021-05-02 13:52:45,283 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 13:52:45,284 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 13:52:45,284 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 13:52:45,285 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 13:52:45,312 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:52:45" (1/1) ... [2021-05-02 13:52:45,313 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:52:45" (1/1) ... [2021-05-02 13:52:45,319 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:52:45" (1/1) ... [2021-05-02 13:52:45,319 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:52:45" (1/1) ... [2021-05-02 13:52:45,327 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:52:45" (1/1) ... [2021-05-02 13:52:45,331 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:52:45" (1/1) ... [2021-05-02 13:52:45,332 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:52:45" (1/1) ... [2021-05-02 13:52:45,336 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 13:52:45,337 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 13:52:45,337 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 13:52:45,337 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 13:52:45,338 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:52:45" (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 13:52:45,387 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 13:52:45,387 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 13:52:45,387 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 13:52:45,387 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 13:52:45,387 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 13:52:45,387 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 13:52:45,388 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 13:52:45,388 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 13:52:45,388 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 13:52:45,388 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 13:52:45,388 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 13:52:45,388 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 13:52:45,389 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 13:52:45,389 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 13:52:45,389 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 13:52:45,389 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 13:52:45,390 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 13:52:45,390 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 13:52:45,390 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 13:52:45,390 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 13:52:45,592 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 13:52:45,592 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 13:52:45,593 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:52:45 BoogieIcfgContainer [2021-05-02 13:52:45,593 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 13:52:45,594 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 13:52:45,594 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 13:52:45,595 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 13:52:45,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 01:52:45" (1/3) ... [2021-05-02 13:52:45,596 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d478873 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:52:45, skipping insertion in model container [2021-05-02 13:52:45,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 01:52:45" (2/3) ... [2021-05-02 13:52:45,596 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d478873 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 01:52:45, skipping insertion in model container [2021-05-02 13:52:45,596 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 01:52:45" (3/3) ... [2021-05-02 13:52:45,597 INFO L111 eAbstractionObserver]: Analyzing ICFG sqrt1-ll.c [2021-05-02 13:52:45,601 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 13:52:45,603 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 13:52:45,613 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 13:52:45,627 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 13:52:45,627 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 13:52:45,627 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 13:52:45,627 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 13:52:45,628 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 13:52:45,628 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 13:52:45,628 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 13:52:45,628 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 13:52:45,654 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 13:52:45,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:52:45,657 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:52:45,657 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:52:45,657 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:52:45,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:52:45,661 INFO L82 PathProgramCache]: Analyzing trace with hash 515438393, now seen corresponding path program 1 times [2021-05-02 13:52:45,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:52:45,667 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223909082] [2021-05-02 13:52:45,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:52:45,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:52:45,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:52:45,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:52:45,842 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:52:45,842 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:52:45,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223909082] [2021-05-02 13:52:45,843 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1223909082] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:52:45,843 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:52:45,843 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 13:52:45,843 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705753242] [2021-05-02 13:52:45,846 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 13:52:45,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:52:45,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 13:52:45,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:52:45,855 INFO L87 Difference]: Start difference. First operand has 25 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 8 states have call successors, (8), 3 states have call predecessors, (8), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:52:45,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:52:45,923 INFO L93 Difference]: Finished difference Result 44 states and 66 transitions. [2021-05-02 13:52:45,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 13:52:45,924 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:52:45,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:52:45,929 INFO L225 Difference]: With dead ends: 44 [2021-05-02 13:52:45,929 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 13:52:45,931 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 46.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 13:52:45,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 13:52:45,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-02 13:52:45,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 10 states have internal predecessors, (11), 8 states have call successors, (8), 3 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 13:52:45,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2021-05-02 13:52:45,957 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 11 [2021-05-02 13:52:45,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:52:45,957 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2021-05-02 13:52:45,957 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:52:45,957 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2021-05-02 13:52:45,958 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 13:52:45,958 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:52:45,958 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:52:45,959 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 13:52:45,959 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:52:45,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:52:45,959 INFO L82 PathProgramCache]: Analyzing trace with hash 517106689, now seen corresponding path program 1 times [2021-05-02 13:52:45,959 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:52:45,960 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910249700] [2021-05-02 13:52:45,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:52:45,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:52:46,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 13:52:46,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:52:46,107 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:52:46,108 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:52:46,108 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910249700] [2021-05-02 13:52:46,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [910249700] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 13:52:46,108 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 13:52:46,108 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 13:52:46,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177238572] [2021-05-02 13:52:46,109 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:52:46,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:52:46,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:52:46,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:52:46,110 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:52:46,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:52:46,426 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2021-05-02 13:52:46,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:52:46,427 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2021-05-02 13:52:46,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:52:46,427 INFO L225 Difference]: With dead ends: 34 [2021-05-02 13:52:46,427 INFO L226 Difference]: Without dead ends: 32 [2021-05-02 13:52:46,428 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 177.9ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:52:46,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-02 13:52:46,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2021-05-02 13:52:46,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 16 states have internal predecessors, (17), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 13:52:46,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2021-05-02 13:52:46,437 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 11 [2021-05-02 13:52:46,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:52:46,437 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2021-05-02 13:52:46,437 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.1666666666666667) internal successors, (7), 4 states have internal predecessors, (7), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 13:52:46,437 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2021-05-02 13:52:46,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-02 13:52:46,439 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:52:46,439 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:52:46,439 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 13:52:46,439 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:52:46,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:52:46,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1248765655, now seen corresponding path program 1 times [2021-05-02 13:52:46,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:52:46,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377486971] [2021-05-02 13:52:46,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:52:46,450 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:52:46,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1438928861] [2021-05-02 13:52:46,450 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 13:52:46,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:52:46,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 13:52:46,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:52:46,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 13:52:46,620 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:52:46,620 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377486971] [2021-05-02 13:52:46,620 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:52:46,620 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1438928861] [2021-05-02 13:52:46,620 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1438928861] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:52:46,621 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:52:46,621 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 13:52:46,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1367608618] [2021-05-02 13:52:46,621 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 13:52:46,621 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:52:46,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 13:52:46,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:52:46,622 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:52:46,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:52:46,744 INFO L93 Difference]: Finished difference Result 38 states and 47 transitions. [2021-05-02 13:52:46,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:52:46,744 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 16 [2021-05-02 13:52:46,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:52:46,746 INFO L225 Difference]: With dead ends: 38 [2021-05-02 13:52:46,746 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 13:52:46,747 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 45.4ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:52:46,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 13:52:46,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-05-02 13:52:46,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 18 states have internal predecessors, (19), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 13:52:46,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-05-02 13:52:46,762 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 16 [2021-05-02 13:52:46,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:52:46,762 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-05-02 13:52:46,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 13:52:46,762 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-05-02 13:52:46,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 13:52:46,763 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:52:46,763 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:52:46,977 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 13:52:46,977 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:52:46,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:52:46,978 INFO L82 PathProgramCache]: Analyzing trace with hash 412610311, now seen corresponding path program 1 times [2021-05-02 13:52:46,978 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:52:46,978 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180177863] [2021-05-02 13:52:46,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:52:46,986 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:52:46,986 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [856845248] [2021-05-02 13:52:46,986 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 13:52:47,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 13:52:47,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 13:52:47,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:52:47,143 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:52:47,143 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:52:47,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180177863] [2021-05-02 13:52:47,143 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:52:47,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856845248] [2021-05-02 13:52:47,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [856845248] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:52:47,143 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:52:47,144 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 13:52:47,144 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136292] [2021-05-02 13:52:47,144 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 13:52:47,144 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:52:47,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 13:52:47,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 13:52:47,145 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:52:47,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:52:47,202 INFO L93 Difference]: Finished difference Result 47 states and 58 transitions. [2021-05-02 13:52:47,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 13:52:47,202 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2021-05-02 13:52:47,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:52:47,204 INFO L225 Difference]: With dead ends: 47 [2021-05-02 13:52:47,204 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 13:52:47,205 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 20.1ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:52:47,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 13:52:47,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-05-02 13:52:47,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 24 states have internal predecessors, (25), 15 states have call successors, (15), 6 states have call predecessors, (15), 5 states have return successors, (13), 12 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 13:52:47,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 53 transitions. [2021-05-02 13:52:47,220 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 53 transitions. Word has length 28 [2021-05-02 13:52:47,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:52:47,220 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 53 transitions. [2021-05-02 13:52:47,221 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-02 13:52:47,221 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 53 transitions. [2021-05-02 13:52:47,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 13:52:47,221 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:52:47,221 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:52:47,436 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:52:47,437 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:52:47,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:52:47,437 INFO L82 PathProgramCache]: Analyzing trace with hash -1543321117, now seen corresponding path program 2 times [2021-05-02 13:52:47,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:52:47,438 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1633280780] [2021-05-02 13:52:47,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:52:47,445 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:52:47,445 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [777791283] [2021-05-02 13:52:47,446 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 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 13:52:47,495 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 13:52:47,496 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:52:47,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 13:52:47,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:52:47,631 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 12 proven. 11 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 13:52:47,631 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:52:47,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1633280780] [2021-05-02 13:52:47,631 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:52:47,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [777791283] [2021-05-02 13:52:47,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [777791283] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:52:47,631 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:52:47,631 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 13:52:47,632 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238810219] [2021-05-02 13:52:47,632 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 13:52:47,632 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:52:47,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 13:52:47,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:52:47,633 INFO L87 Difference]: Start difference. First operand 43 states and 53 transitions. Second operand has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 13:52:47,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:52:47,861 INFO L93 Difference]: Finished difference Result 51 states and 61 transitions. [2021-05-02 13:52:47,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 13:52:47,862 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 33 [2021-05-02 13:52:47,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:52:47,863 INFO L225 Difference]: With dead ends: 51 [2021-05-02 13:52:47,863 INFO L226 Difference]: Without dead ends: 46 [2021-05-02 13:52:47,863 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 114.5ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 13:52:47,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-05-02 13:52:47,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-05-02 13:52:47,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 25 states have (on average 1.08) internal successors, (27), 26 states have internal predecessors, (27), 14 states have call successors, (14), 7 states have call predecessors, (14), 6 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 13:52:47,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 53 transitions. [2021-05-02 13:52:47,869 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 53 transitions. Word has length 33 [2021-05-02 13:52:47,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:52:47,869 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 53 transitions. [2021-05-02 13:52:47,869 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 13:52:47,869 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 53 transitions. [2021-05-02 13:52:47,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-05-02 13:52:47,877 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:52:47,877 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:52:48,093 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:52:48,093 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:52:48,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:52:48,094 INFO L82 PathProgramCache]: Analyzing trace with hash -2087446335, now seen corresponding path program 3 times [2021-05-02 13:52:48,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:52:48,094 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840630836] [2021-05-02 13:52:48,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:52:48,100 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:52:48,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [240269538] [2021-05-02 13:52:48,101 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 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 13:52:48,144 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 13:52:48,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:52:48,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 13:52:48,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:52:48,248 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 13:52:48,249 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:52:48,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840630836] [2021-05-02 13:52:48,249 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:52:48,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [240269538] [2021-05-02 13:52:48,249 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [240269538] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:52:48,249 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:52:48,249 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 13:52:48,249 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221306442] [2021-05-02 13:52:48,250 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 13:52:48,250 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:52:48,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 13:52:48,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 13:52:48,251 INFO L87 Difference]: Start difference. First operand 46 states and 53 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:52:48,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:52:48,340 INFO L93 Difference]: Finished difference Result 60 states and 72 transitions. [2021-05-02 13:52:48,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 13:52:48,341 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 45 [2021-05-02 13:52:48,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:52:48,342 INFO L225 Difference]: With dead ends: 60 [2021-05-02 13:52:48,342 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 13:52:48,342 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 27.2ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 13:52:48,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 13:52:48,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2021-05-02 13:52:48,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 30 states have (on average 1.1) internal successors, (33), 32 states have internal predecessors, (33), 18 states have call successors, (18), 8 states have call predecessors, (18), 7 states have return successors, (16), 15 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 13:52:48,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 67 transitions. [2021-05-02 13:52:48,348 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 67 transitions. Word has length 45 [2021-05-02 13:52:48,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:52:48,349 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 67 transitions. [2021-05-02 13:52:48,349 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 4 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 13:52:48,349 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 67 transitions. [2021-05-02 13:52:48,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 13:52:48,349 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 13:52:48,350 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 13:52:48,559 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 13:52:48,559 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 13:52:48,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 13:52:48,560 INFO L82 PathProgramCache]: Analyzing trace with hash -358767511, now seen corresponding path program 4 times [2021-05-02 13:52:48,560 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 13:52:48,560 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432252183] [2021-05-02 13:52:48,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 13:52:48,572 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 13:52:48,572 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [544815632] [2021-05-02 13:52:48,572 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST 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 13:52:48,619 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 13:52:48,619 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 13:52:48,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 13:52:48,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 13:52:48,726 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:52:48,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 13:52:48,742 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 27 proven. 27 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-05-02 13:52:48,743 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 13:52:48,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432252183] [2021-05-02 13:52:48,743 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 13:52:48,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544815632] [2021-05-02 13:52:48,743 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544815632] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 13:52:48,743 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 13:52:48,743 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 13:52:48,743 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731839997] [2021-05-02 13:52:48,743 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 13:52:48,744 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 13:52:48,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 13:52:48,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 13:52:48,745 INFO L87 Difference]: Start difference. First operand 56 states and 67 transitions. Second operand has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 13:52:48,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 13:52:48,802 INFO L93 Difference]: Finished difference Result 56 states and 67 transitions. [2021-05-02 13:52:48,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 13:52:48,802 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 50 [2021-05-02 13:52:48,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 13:52:48,802 INFO L225 Difference]: With dead ends: 56 [2021-05-02 13:52:48,803 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 13:52:48,804 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 36.0ms TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2021-05-02 13:52:48,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 13:52:48,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 13:52:48,804 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 13:52:48,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 13:52:48,804 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 50 [2021-05-02 13:52:48,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 13:52:48,805 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 13:52:48,805 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.8888888888888888) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 13:52:48,805 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 13:52:48,805 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 13:52:49,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 13:52:49,022 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 13:52:49,292 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 5) no Hoare annotation was computed. [2021-05-02 13:52:49,292 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 5) no Hoare annotation was computed. [2021-05-02 13:52:49,292 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 5) no Hoare annotation was computed. [2021-05-02 13:52:49,292 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-02 13:52:49,292 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)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-02 13:52:49,292 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-02 13:52:49,292 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-02 13:52:49,292 INFO L201 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: true [2021-05-02 13:52:49,293 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-02 13:52:49,293 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-02 13:52:49,293 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notENTRY(lines 8 10) no Hoare annotation was computed. [2021-05-02 13:52:49,293 INFO L198 CegarLoopUtils]: For program point L9(line 9) no Hoare annotation was computed. [2021-05-02 13:52:49,293 INFO L198 CegarLoopUtils]: For program point L9-2(lines 8 10) no Hoare annotation was computed. [2021-05-02 13:52:49,293 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notEXIT(lines 8 10) no Hoare annotation was computed. [2021-05-02 13:52:49,293 INFO L198 CegarLoopUtils]: For program point L32(lines 29 41) no Hoare annotation was computed. [2021-05-02 13:52:49,293 INFO L194 CegarLoopUtils]: At program point L31(line 31) the Hoare annotation is: (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) [2021-05-02 13:52:49,293 INFO L194 CegarLoopUtils]: At program point L30(line 30) the Hoare annotation is: (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) [2021-05-02 13:52:49,293 INFO L201 CegarLoopUtils]: At program point mainENTRY(lines 20 48) the Hoare annotation is: true [2021-05-02 13:52:49,293 INFO L194 CegarLoopUtils]: At program point L30-1(line 30) the Hoare annotation is: (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) [2021-05-02 13:52:49,293 INFO L194 CegarLoopUtils]: At program point L29-2(lines 29 41) the Hoare annotation is: (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) [2021-05-02 13:52:49,293 INFO L194 CegarLoopUtils]: At program point L29-3(lines 29 41) the Hoare annotation is: (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) [2021-05-02 13:52:49,293 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 20 48) no Hoare annotation was computed. [2021-05-02 13:52:49,294 INFO L198 CegarLoopUtils]: For program point L45(line 45) no Hoare annotation was computed. [2021-05-02 13:52:49,294 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 20 48) no Hoare annotation was computed. [2021-05-02 13:52:49,294 INFO L194 CegarLoopUtils]: At program point L44(line 44) the Hoare annotation is: (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) [2021-05-02 13:52:49,294 INFO L194 CegarLoopUtils]: At program point L43(line 43) the Hoare annotation is: (let ((.cse0 (* main_~a~0 2))) (and (= (+ .cse0 (* main_~a~0 main_~a~0) 1) main_~s~0) (= (+ .cse0 1) main_~t~0))) [2021-05-02 13:52:49,294 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 11 17) the Hoare annotation is: true [2021-05-02 13:52:49,294 INFO L198 CegarLoopUtils]: For program point L13(lines 13 14) no Hoare annotation was computed. [2021-05-02 13:52:49,294 INFO L198 CegarLoopUtils]: For program point L12(lines 12 15) no Hoare annotation was computed. [2021-05-02 13:52:49,294 INFO L198 CegarLoopUtils]: For program point L12-2(lines 11 17) no Hoare annotation was computed. [2021-05-02 13:52:49,294 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertEXIT(lines 11 17) no Hoare annotation was computed. [2021-05-02 13:52:49,294 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-05-02 13:52:49,303 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 01:52:49 BoogieIcfgContainer [2021-05-02 13:52:49,303 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 13:52:49,304 INFO L168 Benchmark]: Toolchain (without parser) took 4210.00 ms. Allocated memory was 210.8 MB in the beginning and 253.8 MB in the end (delta: 43.0 MB). Free memory was 174.3 MB in the beginning and 199.9 MB in the end (delta: -25.6 MB). Peak memory consumption was 130.6 MB. Max. memory is 8.0 GB. [2021-05-02 13:52:49,304 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 210.8 MB. Free memory is still 190.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 13:52:49,304 INFO L168 Benchmark]: CACSL2BoogieTranslator took 188.65 ms. Allocated memory is still 210.8 MB. Free memory was 174.0 MB in the beginning and 191.6 MB in the end (delta: -17.6 MB). Peak memory consumption was 12.9 MB. Max. memory is 8.0 GB. [2021-05-02 13:52:49,304 INFO L168 Benchmark]: Boogie Preprocessor took 51.87 ms. Allocated memory is still 210.8 MB. Free memory was 191.6 MB in the beginning and 193.0 MB in the end (delta: -1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 13:52:49,304 INFO L168 Benchmark]: RCFGBuilder took 255.78 ms. Allocated memory is still 210.8 MB. Free memory was 193.0 MB in the beginning and 178.7 MB in the end (delta: 14.3 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2021-05-02 13:52:49,304 INFO L168 Benchmark]: TraceAbstraction took 3709.56 ms. Allocated memory was 210.8 MB in the beginning and 253.8 MB in the end (delta: 43.0 MB). Free memory was 178.3 MB in the beginning and 199.9 MB in the end (delta: -21.5 MB). Peak memory consumption was 134.5 MB. Max. memory is 8.0 GB. [2021-05-02 13:52:49,304 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09 ms. Allocated memory is still 210.8 MB. Free memory is still 190.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 188.65 ms. Allocated memory is still 210.8 MB. Free memory was 174.0 MB in the beginning and 191.6 MB in the end (delta: -17.6 MB). Peak memory consumption was 12.9 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 51.87 ms. Allocated memory is still 210.8 MB. Free memory was 191.6 MB in the beginning and 193.0 MB in the end (delta: -1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 255.78 ms. Allocated memory is still 210.8 MB. Free memory was 193.0 MB in the beginning and 178.7 MB in the end (delta: 14.3 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3709.56 ms. Allocated memory was 210.8 MB in the beginning and 253.8 MB in the end (delta: 43.0 MB). Free memory was 178.3 MB in the beginning and 199.9 MB in the end (delta: -21.5 MB). Peak memory consumption was 134.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 14]: 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, 32 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 3395.0ms, OverallIterations: 7, TraceHistogramMax: 8, EmptinessCheckTime: 17.7ms, AutomataDifference: 973.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 270.6ms, InitialAbstractionConstructionTime: 23.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 155 SDtfs, 85 SDslu, 485 SDs, 0 SdLazy, 488 SolverSat, 95 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 468.3ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 190 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 467.8ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=6, InterpolantAutomatonStates: 43, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 66.2ms AutomataMinimizationTime, 7 MinimizatonAttempts, 6 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 12 LocationsWithAnnotation, 39 PreInvPairs, 65 NumberOfFragments, 161 HoareAnnotationTreeSize, 39 FomulaSimplifications, 1712 FormulaSimplificationTreeSizeReduction, 82.0ms HoareSimplificationTime, 12 FomulaSimplificationsInter, 601 FormulaSimplificationTreeSizeReductionInter, 160.7ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 45.8ms SsaConstructionTime, 128.4ms SatisfiabilityAnalysisTime, 817.5ms InterpolantComputationTime, 194 NumberOfCodeBlocks, 177 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 187 ConstructedInterpolants, 0 QuantifiedInterpolants, 634 SizeOfPredicates, 14 NumberOfNonLiveVariables, 636 ConjunctsInSsa, 103 ConjunctsInUnsatCore, 7 InterpolantComputations, 2 PerfectInterpolantSequences, 197/247 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: 29]: Loop Invariant Derived loop invariant: a * 2 + a * a + 1 == s && a * 2 + 1 == t RESULT: Ultimate proved your program to be correct! Received shutdown request...