/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/ps4-ll_unwindbound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 16:54:44,291 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 16:54:44,292 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 16:54:44,319 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-05-02 16:54:44,319 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-05-02 16:54:44,320 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-05-02 16:54:44,321 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-05-02 16:54:44,322 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-05-02 16:54:44,323 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-05-02 16:54:44,324 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-05-02 16:54:44,325 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-05-02 16:54:44,325 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-05-02 16:54:44,326 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 16:54:44,326 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 16:54:44,327 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 16:54:44,328 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 16:54:44,328 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 16:54:44,329 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 16:54:44,330 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 16:54:44,338 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 16:54:44,339 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 16:54:44,341 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 16:54:44,341 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 16:54:44,342 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 16:54:44,344 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-05-02 16:54:44,344 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-05-02 16:54:44,344 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-05-02 16:54:44,345 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-05-02 16:54:44,345 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-05-02 16:54:44,346 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-05-02 16:54:44,346 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-05-02 16:54:44,346 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-05-02 16:54:44,347 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-05-02 16:54:44,347 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-05-02 16:54:44,348 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-05-02 16:54:44,348 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-05-02 16:54:44,349 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-05-02 16:54:44,349 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-05-02 16:54:44,349 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 16:54:44,350 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 16:54:44,350 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 16:54:44,351 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 16:54:44,366 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 16:54:44,366 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 16:54:44,367 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 16:54:44,368 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 16:54:44,368 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 16:54:44,368 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 16:54:44,368 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 16:54:44,368 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 16:54:44,368 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 16:54:44,368 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 16:54:44,368 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 16:54:44,369 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 16:54:44,369 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 16:54:44,369 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 16:54:44,369 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 16:54:44,369 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 16:54:44,369 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 16:54:44,369 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 16:54:44,369 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 16:54:44,369 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 16:54:44,370 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 16:54:44,370 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 16:54:44,370 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 16:54:44,370 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 16:54:44,370 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 16:54:44,370 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 16:54:44,370 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 16:54:44,371 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 16:54:44,371 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 16:54:44,617 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 16:54:44,635 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 16:54:44,637 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 16:54:44,637 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 16:54:44,638 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 16:54:44,639 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/ps4-ll_unwindbound5.c [2021-05-02 16:54:44,686 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47be2dd30/15fde7a9c2784e72808754e5e122c414/FLAG1f15ed3a9 [2021-05-02 16:54:45,052 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 16:54:45,052 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/ps4-ll_unwindbound5.c [2021-05-02 16:54:45,057 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47be2dd30/15fde7a9c2784e72808754e5e122c414/FLAG1f15ed3a9 [2021-05-02 16:54:45,070 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/47be2dd30/15fde7a9c2784e72808754e5e122c414 [2021-05-02 16:54:45,073 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 16:54:45,074 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 16:54:45,078 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 16:54:45,078 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 16:54:45,081 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 16:54:45,081 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:54:45" (1/1) ... [2021-05-02 16:54:45,082 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56d51d29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:54:45, skipping insertion in model container [2021-05-02 16:54:45,082 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:54:45" (1/1) ... [2021-05-02 16:54:45,086 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 16:54:45,100 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 16:54:45,213 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/ps4-ll_unwindbound5.c[458,471] [2021-05-02 16:54:45,226 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:54:45,232 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 16:54:45,241 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/ps4-ll_unwindbound5.c[458,471] [2021-05-02 16:54:45,257 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:54:45,267 INFO L208 MainTranslator]: Completed translation [2021-05-02 16:54:45,268 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:54:45 WrapperNode [2021-05-02 16:54:45,268 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 16:54:45,270 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 16:54:45,270 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 16:54:45,271 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 16:54:45,311 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:54:45" (1/1) ... [2021-05-02 16:54:45,312 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:54:45" (1/1) ... [2021-05-02 16:54:45,316 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:54:45" (1/1) ... [2021-05-02 16:54:45,317 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:54:45" (1/1) ... [2021-05-02 16:54:45,325 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:54:45" (1/1) ... [2021-05-02 16:54:45,329 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:54:45" (1/1) ... [2021-05-02 16:54:45,330 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:54:45" (1/1) ... [2021-05-02 16:54:45,335 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 16:54:45,336 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 16:54:45,336 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 16:54:45,336 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 16:54:45,336 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:54:45" (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 16:54:45,402 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 16:54:45,402 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 16:54:45,402 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 16:54:45,402 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 16:54:45,402 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 16:54:45,402 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 16:54:45,402 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 16:54:45,403 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 16:54:45,403 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 16:54:45,403 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 16:54:45,403 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_short [2021-05-02 16:54:45,403 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 16:54:45,404 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 16:54:45,404 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 16:54:45,404 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 16:54:45,404 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 16:54:45,404 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 16:54:45,404 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 16:54:45,404 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 16:54:45,405 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 16:54:45,599 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 16:54:45,599 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 16:54:45,600 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:54:45 BoogieIcfgContainer [2021-05-02 16:54:45,600 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 16:54:45,601 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 16:54:45,602 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 16:54:45,603 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 16:54:45,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 04:54:45" (1/3) ... [2021-05-02 16:54:45,604 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6de7ae61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:54:45, skipping insertion in model container [2021-05-02 16:54:45,604 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:54:45" (2/3) ... [2021-05-02 16:54:45,604 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6de7ae61 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:54:45, skipping insertion in model container [2021-05-02 16:54:45,604 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:54:45" (3/3) ... [2021-05-02 16:54:45,605 INFO L111 eAbstractionObserver]: Analyzing ICFG ps4-ll_unwindbound5.c [2021-05-02 16:54:45,609 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 16:54:45,611 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 16:54:45,634 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 16:54:45,658 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 16:54:45,658 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 16:54:45,658 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 16:54:45,658 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 16:54:45,658 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 16:54:45,658 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 16:54:45,658 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 16:54:45,658 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 16:54:45,668 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:54:45,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-05-02 16:54:45,671 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:54:45,671 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:54:45,671 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:54:45,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:54:45,675 INFO L82 PathProgramCache]: Analyzing trace with hash -2133548928, now seen corresponding path program 1 times [2021-05-02 16:54:45,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:54:45,680 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492111173] [2021-05-02 16:54:45,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:54:45,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:54:45,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 16:54:45,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:54:45,878 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 16:54:45,879 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:54:45,879 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492111173] [2021-05-02 16:54:45,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492111173] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:54:45,879 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:54:45,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 16:54:45,880 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506655715] [2021-05-02 16:54:45,883 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 16:54:45,883 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:54:45,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 16:54:45,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:54:45,893 INFO L87 Difference]: Start difference. First operand has 23 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) 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 16:54:45,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:54:45,963 INFO L93 Difference]: Finished difference Result 41 states and 55 transitions. [2021-05-02 16:54:45,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 16:54:45,964 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 16:54:45,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:54:45,968 INFO L225 Difference]: With dead ends: 41 [2021-05-02 16:54:45,969 INFO L226 Difference]: Without dead ends: 19 [2021-05-02 16:54:45,971 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 53.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:54:45,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-05-02 16:54:45,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-05-02 16:54:45,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:54:45,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2021-05-02 16:54:45,995 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 11 [2021-05-02 16:54:45,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:54:45,995 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2021-05-02 16:54:45,995 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 16:54:45,995 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2021-05-02 16:54:45,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 16:54:45,996 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:54:45,996 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:54:45,996 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 16:54:45,996 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:54:45,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:54:45,997 INFO L82 PathProgramCache]: Analyzing trace with hash -2118701623, now seen corresponding path program 1 times [2021-05-02 16:54:45,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:54:45,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [567063739] [2021-05-02 16:54:45,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:54:46,010 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:54:46,010 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [563693211] [2021-05-02 16:54:46,010 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 16:54:46,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:54:46,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 16:54:46,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:54:46,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:54:46,134 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:54:46,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:54:46,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:54:46,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:54:46,166 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 16:54:46,167 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:54:46,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [567063739] [2021-05-02 16:54:46,167 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:54:46,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563693211] [2021-05-02 16:54:46,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [563693211] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:54:46,167 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:54:46,167 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 16:54:46,167 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310199201] [2021-05-02 16:54:46,168 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 16:54:46,168 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:54:46,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 16:54:46,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 16:54:46,169 INFO L87 Difference]: Start difference. First operand 18 states and 21 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 16:54:46,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:54:46,188 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-02 16:54:46,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 16:54:46,189 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 16:54:46,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:54:46,190 INFO L225 Difference]: With dead ends: 28 [2021-05-02 16:54:46,190 INFO L226 Difference]: Without dead ends: 20 [2021-05-02 16:54:46,190 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.8ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 16:54:46,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-05-02 16:54:46,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-05-02 16:54:46,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:54:46,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-05-02 16:54:46,194 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 12 [2021-05-02 16:54:46,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:54:46,194 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-05-02 16:54:46,194 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-02 16:54:46,195 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-05-02 16:54:46,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-02 16:54:46,195 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:54:46,195 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:54:46,395 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 16:54:46,396 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:54:46,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:54:46,396 INFO L82 PathProgramCache]: Analyzing trace with hash -2116914163, now seen corresponding path program 1 times [2021-05-02 16:54:46,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:54:46,396 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941584603] [2021-05-02 16:54:46,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:54:46,420 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:54:46,420 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [481510059] [2021-05-02 16:54:46,420 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 16:54:46,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:54:46,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-02 16:54:46,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:54:46,541 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 16:54:46,541 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:54:46,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941584603] [2021-05-02 16:54:46,541 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:54:46,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [481510059] [2021-05-02 16:54:46,543 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [481510059] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:54:46,543 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:54:46,543 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 16:54:46,543 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728265346] [2021-05-02 16:54:46,544 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 16:54:46,544 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:54:46,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 16:54:46,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 16:54:46,545 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 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 16:54:46,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:54:46,604 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2021-05-02 16:54:46,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 16:54:46,604 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-02 16:54:46,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:54:46,605 INFO L225 Difference]: With dead ends: 30 [2021-05-02 16:54:46,605 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 16:54:46,605 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 33.7ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-02 16:54:46,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 16:54:46,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-02 16:54:46,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 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 16:54:46,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2021-05-02 16:54:46,610 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 12 [2021-05-02 16:54:46,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:54:46,610 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2021-05-02 16:54:46,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 2 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 16:54:46,610 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2021-05-02 16:54:46,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 16:54:46,611 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:54:46,611 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:54:46,826 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:54:46,827 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:54:46,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:54:46,827 INFO L82 PathProgramCache]: Analyzing trace with hash -263585780, now seen corresponding path program 1 times [2021-05-02 16:54:46,827 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:54:46,827 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1269164221] [2021-05-02 16:54:46,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:54:46,835 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:54:46,835 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [849147528] [2021-05-02 16:54:46,836 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 16:54:46,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:54:46,880 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 16:54:46,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:54:46,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:54:46,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:54:46,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:54:46,916 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:54:46,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:54:46,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:54:46,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:54:46,962 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:54:46,979 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:54:46,980 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:54:46,980 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1269164221] [2021-05-02 16:54:46,980 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:54:46,980 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849147528] [2021-05-02 16:54:46,980 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849147528] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:54:46,980 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:54:46,980 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 16:54:46,980 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45506888] [2021-05-02 16:54:46,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 16:54:46,981 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:54:46,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 16:54:46,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 16:54:46,981 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (4), 4 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 16:54:47,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:54:47,049 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2021-05-02 16:54:47,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 16:54:47,049 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (4), 4 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 20 [2021-05-02 16:54:47,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:54:47,051 INFO L225 Difference]: With dead ends: 36 [2021-05-02 16:54:47,051 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 16:54:47,052 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 49.7ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 16:54:47,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 16:54:47,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-05-02 16:54:47,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 19 states have internal predecessors, (21), 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 16:54:47,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2021-05-02 16:54:47,057 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 20 [2021-05-02 16:54:47,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:54:47,057 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2021-05-02 16:54:47,057 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 4 states have internal predecessors, (14), 4 states have call successors, (4), 4 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 16:54:47,058 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2021-05-02 16:54:47,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 16:54:47,058 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:54:47,058 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:54:47,258 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:54:47,259 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:54:47,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:54:47,259 INFO L82 PathProgramCache]: Analyzing trace with hash -261798320, now seen corresponding path program 1 times [2021-05-02 16:54:47,259 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:54:47,259 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562283073] [2021-05-02 16:54:47,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:54:47,266 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:54:47,267 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [85745478] [2021-05-02 16:54:47,267 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 16:54:47,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:54:47,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 16:54:47,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:54:47,381 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:54:47,381 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:54:47,381 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562283073] [2021-05-02 16:54:47,382 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:54:47,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [85745478] [2021-05-02 16:54:47,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [85745478] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:54:47,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:54:47,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 16:54:47,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322441168] [2021-05-02 16:54:47,382 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 16:54:47,382 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:54:47,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 16:54:47,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 16:54:47,383 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 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 16:57:59,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:57:59,884 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-05-02 16:57:59,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 16:57:59,884 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 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 20 [2021-05-02 16:57:59,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:57:59,885 INFO L225 Difference]: With dead ends: 38 [2021-05-02 16:57:59,885 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 16:57:59,885 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 41.9ms TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-02 16:57:59,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 16:57:59,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 16:57:59,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 22 states have (on average 1.1818181818181819) internal successors, (26), 24 states have internal predecessors, (26), 8 states have call successors, (8), 5 states have call predecessors, (8), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:57:59,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-05-02 16:57:59,890 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 20 [2021-05-02 16:57:59,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:57:59,890 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-05-02 16:57:59,890 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 states have internal predecessors, (14), 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 16:57:59,890 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-05-02 16:57:59,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-02 16:57:59,891 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:57:59,891 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:58:00,096 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:58:00,097 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:58:00,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:58:00,097 INFO L82 PathProgramCache]: Analyzing trace with hash 891414954, now seen corresponding path program 1 times [2021-05-02 16:58:00,097 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:58:00,097 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480837955] [2021-05-02 16:58:00,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:58:00,106 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:58:00,106 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [379457764] [2021-05-02 16:58:00,107 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 16:58:00,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:58:00,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 16:58:00,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:58:00,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,226 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,312 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 16:58:00,312 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:58:00,312 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480837955] [2021-05-02 16:58:00,312 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:58:00,312 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [379457764] [2021-05-02 16:58:00,312 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [379457764] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:58:00,312 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:58:00,312 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 16:58:00,313 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563510544] [2021-05-02 16:58:00,313 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 16:58:00,313 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:58:00,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 16:58:00,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 16:58:00,314 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 9 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:58:00,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:58:00,404 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2021-05-02 16:58:00,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 16:58:00,405 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 26 [2021-05-02 16:58:00,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:58:00,405 INFO L225 Difference]: With dead ends: 41 [2021-05-02 16:58:00,405 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 16:58:00,406 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 76.9ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-02 16:58:00,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 16:58:00,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 16:58:00,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 23 states have internal predecessors, (25), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:58:00,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2021-05-02 16:58:00,414 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2021-05-02 16:58:00,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:58:00,415 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2021-05-02 16:58:00,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.25) internal successors, (18), 8 states have internal predecessors, (18), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:58:00,415 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2021-05-02 16:58:00,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 16:58:00,416 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:58:00,416 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:58:00,623 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 16:58:00,624 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:58:00,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:58:00,624 INFO L82 PathProgramCache]: Analyzing trace with hash -1647059121, now seen corresponding path program 2 times [2021-05-02 16:58:00,624 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:58:00,624 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311059826] [2021-05-02 16:58:00,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:58:00,631 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:58:00,631 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [210989551] [2021-05-02 16:58:00,631 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 16:58:00,675 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 16:58:00,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:58:00,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 16:58:00,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:58:00,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,701 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,716 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,742 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,762 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:00,777 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:58:00,778 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:58:00,778 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311059826] [2021-05-02 16:58:00,778 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:58:00,780 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210989551] [2021-05-02 16:58:00,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [210989551] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:58:00,780 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:58:00,780 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 16:58:00,780 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916346918] [2021-05-02 16:58:00,780 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 16:58:00,781 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:58:00,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 16:58:00,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 16:58:00,781 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:58:00,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:58:00,826 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2021-05-02 16:58:00,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 16:58:00,826 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2021-05-02 16:58:00,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:58:00,828 INFO L225 Difference]: With dead ends: 44 [2021-05-02 16:58:00,828 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 16:58:00,829 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 19.2ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 16:58:00,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 16:58:00,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 16:58:00,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.125) internal successors, (27), 25 states have internal predecessors, (27), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:58:00,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2021-05-02 16:58:00,836 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 28 [2021-05-02 16:58:00,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:58:00,836 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2021-05-02 16:58:00,836 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 5 states have internal predecessors, (20), 5 states have call successors, (5), 5 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:58:00,836 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2021-05-02 16:58:00,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 16:58:00,837 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:58:00,837 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:58:01,037 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:58:01,037 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:58:01,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:58:01,038 INFO L82 PathProgramCache]: Analyzing trace with hash -1645271661, now seen corresponding path program 2 times [2021-05-02 16:58:01,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:58:01,038 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548399952] [2021-05-02 16:58:01,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:58:01,046 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:58:01,047 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [354099029] [2021-05-02 16:58:01,047 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 16:58:01,087 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 16:58:01,087 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:58:01,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 16:58:01,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:58:01,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:01,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:01,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:01,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:01,243 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 16:58:01,244 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:58:01,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548399952] [2021-05-02 16:58:01,244 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:58:01,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [354099029] [2021-05-02 16:58:01,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [354099029] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:58:01,244 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:58:01,244 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 16:58:01,244 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760755581] [2021-05-02 16:58:01,244 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 16:58:01,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:58:01,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 16:58:01,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 16:58:01,245 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:58:01,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:58:01,348 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2021-05-02 16:58:01,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 16:58:01,349 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 28 [2021-05-02 16:58:01,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:58:01,351 INFO L225 Difference]: With dead ends: 46 [2021-05-02 16:58:01,351 INFO L226 Difference]: Without dead ends: 43 [2021-05-02 16:58:01,351 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 87.5ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 16:58:01,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-02 16:58:01,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-05-02 16:58:01,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 30 states have internal predecessors, (32), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:58:01,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2021-05-02 16:58:01,363 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 28 [2021-05-02 16:58:01,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:58:01,363 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2021-05-02 16:58:01,364 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 16:58:01,364 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2021-05-02 16:58:01,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 16:58:01,366 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:58:01,366 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:58:01,572 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:58:01,573 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:58:01,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:58:01,573 INFO L82 PathProgramCache]: Analyzing trace with hash 1036651181, now seen corresponding path program 2 times [2021-05-02 16:58:01,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:58:01,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587244815] [2021-05-02 16:58:01,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:58:01,579 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:58:01,580 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [243815358] [2021-05-02 16:58:01,580 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 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 16:58:01,624 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 16:58:01,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:58:01,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 16:58:01,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:58:01,653 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:01,686 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:01,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:01,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:01,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:01,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:01,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:01,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:01,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:01,729 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 5 proven. 19 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 16:58:01,730 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:58:01,730 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587244815] [2021-05-02 16:58:01,730 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:58:01,730 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243815358] [2021-05-02 16:58:01,730 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [243815358] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:58:01,730 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:58:01,730 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 16:58:01,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665298886] [2021-05-02 16:58:01,730 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 16:58:01,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:58:01,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 16:58:01,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 16:58:01,731 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 16:58:01,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:58:01,824 INFO L93 Difference]: Finished difference Result 49 states and 52 transitions. [2021-05-02 16:58:01,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 16:58:01,825 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2021-05-02 16:58:01,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:58:01,826 INFO L225 Difference]: With dead ends: 49 [2021-05-02 16:58:01,826 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 16:58:01,826 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 72.9ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 16:58:01,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 16:58:01,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 16:58:01,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 29 states have internal predecessors, (31), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:58:01,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2021-05-02 16:58:01,839 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 34 [2021-05-02 16:58:01,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:58:01,840 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2021-05-02 16:58:01,840 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 16:58:01,840 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2021-05-02 16:58:01,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 16:58:01,843 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:58:01,843 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:58:02,043 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 16:58:02,044 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:58:02,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:58:02,044 INFO L82 PathProgramCache]: Analyzing trace with hash 486001554, now seen corresponding path program 3 times [2021-05-02 16:58:02,044 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:58:02,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937971129] [2021-05-02 16:58:02,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:58:02,050 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:58:02,051 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [4139157] [2021-05-02 16:58:02,051 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:58:02,091 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 16:58:02,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:58:02,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 16:58:02,094 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:58:02,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,108 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,129 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,145 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,176 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:58:02,176 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:58:02,176 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937971129] [2021-05-02 16:58:02,177 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:58:02,177 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4139157] [2021-05-02 16:58:02,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [4139157] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:58:02,177 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:58:02,177 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 16:58:02,177 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257887085] [2021-05-02 16:58:02,177 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 16:58:02,177 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:58:02,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 16:58:02,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 16:58:02,178 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 16:58:02,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:58:02,276 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2021-05-02 16:58:02,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 16:58:02,276 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 36 [2021-05-02 16:58:02,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:58:02,277 INFO L225 Difference]: With dead ends: 52 [2021-05-02 16:58:02,277 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 16:58:02,277 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 31.9ms TimeCoverageRelationStatistics Valid=35, Invalid=55, Unknown=0, NotChecked=0, Total=90 [2021-05-02 16:58:02,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 16:58:02,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 16:58:02,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 30 states have (on average 1.1) internal successors, (33), 31 states have internal predecessors, (33), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:58:02,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2021-05-02 16:58:02,281 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 36 [2021-05-02 16:58:02,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:58:02,281 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2021-05-02 16:58:02,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.7142857142857144) internal successors, (26), 6 states have internal predecessors, (26), 6 states have call successors, (6), 6 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 16:58:02,282 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2021-05-02 16:58:02,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 16:58:02,282 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:58:02,282 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:58:02,496 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:58:02,499 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:58:02,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:58:02,499 INFO L82 PathProgramCache]: Analyzing trace with hash 487789014, now seen corresponding path program 3 times [2021-05-02 16:58:02,499 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:58:02,499 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752044301] [2021-05-02 16:58:02,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:58:02,504 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:58:02,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [63489721] [2021-05-02 16:58:02,505 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:58:02,541 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 16:58:02,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:58:02,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 16:58:02,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:58:02,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:02,631 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 22 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-05-02 16:58:02,632 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:58:02,632 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752044301] [2021-05-02 16:58:02,632 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:58:02,632 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63489721] [2021-05-02 16:58:02,632 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63489721] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:58:02,632 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:58:02,632 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 16:58:02,632 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133343415] [2021-05-02 16:58:02,633 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 16:58:02,633 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:58:02,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 16:58:02,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-02 16:58:02,634 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 16:58:02,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:58:02,671 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2021-05-02 16:58:02,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 16:58:02,672 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2021-05-02 16:58:02,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:58:02,672 INFO L225 Difference]: With dead ends: 50 [2021-05-02 16:58:02,672 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 16:58:02,673 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 30.5ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-02 16:58:02,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 16:58:02,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2021-05-02 16:58:02,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:58:02,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2021-05-02 16:58:02,676 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 36 [2021-05-02 16:58:02,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:58:02,676 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2021-05-02 16:58:02,676 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-02 16:58:02,677 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2021-05-02 16:58:02,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 16:58:02,677 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:58:02,677 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:58:02,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:58:02,893 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:58:02,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:58:02,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1383171920, now seen corresponding path program 3 times [2021-05-02 16:58:02,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:58:02,894 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18138759] [2021-05-02 16:58:02,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:58:02,898 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:58:02,899 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2124081904] [2021-05-02 16:58:02,899 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 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:58:03,175 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 16:58:03,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:58:03,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 16:58:03,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:58:03,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,308 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 16:58:03,308 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:58:03,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18138759] [2021-05-02 16:58:03,308 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:58:03,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2124081904] [2021-05-02 16:58:03,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2124081904] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:58:03,309 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:58:03,309 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 16:58:03,309 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797297126] [2021-05-02 16:58:03,309 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 16:58:03,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:58:03,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 16:58:03,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-02 16:58:03,310 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:58:03,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:58:03,391 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2021-05-02 16:58:03,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 16:58:03,392 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 42 [2021-05-02 16:58:03,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:58:03,393 INFO L225 Difference]: With dead ends: 52 [2021-05-02 16:58:03,393 INFO L226 Difference]: Without dead ends: 47 [2021-05-02 16:58:03,393 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 76.0ms TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-05-02 16:58:03,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-05-02 16:58:03,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-05-02 16:58:03,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 33 states have (on average 1.0606060606060606) internal successors, (35), 33 states have internal predecessors, (35), 8 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:58:03,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2021-05-02 16:58:03,398 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 42 [2021-05-02 16:58:03,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:58:03,398 INFO L480 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2021-05-02 16:58:03,398 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 6 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:58:03,398 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2021-05-02 16:58:03,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 16:58:03,398 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:58:03,398 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:58:03,605 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 16:58:03,605 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:58:03,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:58:03,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1386691371, now seen corresponding path program 4 times [2021-05-02 16:58:03,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:58:03,606 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240189698] [2021-05-02 16:58:03,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:58:03,623 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:58:03,624 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [835370305] [2021-05-02 16:58:03,624 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:58:03,675 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 16:58:03,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:58:03,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 16:58:03,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:58:03,687 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,693 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,708 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,709 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,725 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,739 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,754 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,755 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:03,764 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 16:58:03,764 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:58:03,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240189698] [2021-05-02 16:58:03,765 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:58:03,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [835370305] [2021-05-02 16:58:03,765 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [835370305] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:58:03,765 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:58:03,765 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 16:58:03,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433109817] [2021-05-02 16:58:03,765 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 16:58:03,765 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:58:03,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 16:58:03,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 16:58:03,766 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:58:03,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:58:03,828 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2021-05-02 16:58:03,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 16:58:03,828 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Word has length 44 [2021-05-02 16:58:03,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:58:03,828 INFO L225 Difference]: With dead ends: 58 [2021-05-02 16:58:03,829 INFO L226 Difference]: Without dead ends: 53 [2021-05-02 16:58:03,829 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 36.3ms TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2021-05-02 16:58:03,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-05-02 16:58:03,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-05-02 16:58:03,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 38 states have (on average 1.0526315789473684) internal successors, (40), 38 states have internal predecessors, (40), 8 states have call successors, (8), 8 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:58:03,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2021-05-02 16:58:03,833 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 44 [2021-05-02 16:58:03,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:58:03,833 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2021-05-02 16:58:03,833 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 7 states have call successors, (7), 7 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 16:58:03,833 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2021-05-02 16:58:03,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-05-02 16:58:03,833 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:58:03,833 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:58:04,048 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 16:58:04,049 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:58:04,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:58:04,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1037185971, now seen corresponding path program 4 times [2021-05-02 16:58:04,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:58:04,049 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515237072] [2021-05-02 16:58:04,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:58:04,054 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:58:04,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1600981145] [2021-05-02 16:58:04,054 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:58:04,214 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 16:58:04,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 16:58:04,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 16:58:04,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:58:04,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:04,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:04,325 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:04,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:04,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:04,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:04,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:04,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:04,352 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:58:04,372 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 9 proven. 53 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 16:58:04,372 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:58:04,372 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515237072] [2021-05-02 16:58:04,373 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:58:04,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600981145] [2021-05-02 16:58:04,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600981145] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:58:04,373 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:58:04,373 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 16:58:04,373 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1589176026] [2021-05-02 16:58:04,373 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 16:58:04,373 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:58:04,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 16:58:04,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-05-02 16:58:04,374 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 11 states have internal predecessors, (27), 7 states have call successors, (8), 2 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 16:58:04,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:58:04,505 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2021-05-02 16:58:04,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 16:58:04,505 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 11 states have internal predecessors, (27), 7 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 50 [2021-05-02 16:58:04,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:58:04,506 INFO L225 Difference]: With dead ends: 60 [2021-05-02 16:58:04,506 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 16:58:04,506 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 106.0ms TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-05-02 16:58:04,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 16:58:04,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-05-02 16:58:04,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 states have internal predecessors, (41), 9 states have call successors, (9), 8 states have call predecessors, (9), 6 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 16:58:04,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-05-02 16:58:04,510 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 50 [2021-05-02 16:58:04,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:58:04,510 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-05-02 16:58:04,510 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 2.4545454545454546) internal successors, (27), 11 states have internal predecessors, (27), 7 states have call successors, (8), 2 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 16:58:04,510 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-05-02 16:58:04,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-05-02 16:58:04,511 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:58:04,511 INFO L523 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:58:04,716 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 16:58:04,717 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:58:04,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:58:04,717 INFO L82 PathProgramCache]: Analyzing trace with hash 999934744, now seen corresponding path program 5 times [2021-05-02 16:58:04,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:58:04,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419308373] [2021-05-02 16:58:04,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:58:04,721 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:58:04,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [846481578] [2021-05-02 16:58:04,722 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:58:04,775 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-05-02 16:58:04,775 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2021-05-02 16:58:04,775 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 16:58:04,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 16:58:04,842 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 16:58:04,890 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 16:58:04,890 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 16:58:05,091 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:58:05,117 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 04:58:05 BoogieIcfgContainer [2021-05-02 16:58:05,117 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 16:58:05,118 INFO L168 Benchmark]: Toolchain (without parser) took 200043.43 ms. Allocated memory was 195.0 MB in the beginning and 239.1 MB in the end (delta: 44.0 MB). Free memory was 159.6 MB in the beginning and 185.7 MB in the end (delta: -26.1 MB). Peak memory consumption was 18.6 MB. Max. memory is 8.0 GB. [2021-05-02 16:58:05,118 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 195.0 MB. Free memory is still 176.0 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 16:58:05,118 INFO L168 Benchmark]: CACSL2BoogieTranslator took 190.38 ms. Allocated memory is still 195.0 MB. Free memory was 159.4 MB in the beginning and 149.6 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-02 16:58:05,118 INFO L168 Benchmark]: Boogie Preprocessor took 65.22 ms. Allocated memory is still 195.0 MB. Free memory was 149.6 MB in the beginning and 177.7 MB in the end (delta: -28.0 MB). Peak memory consumption was 3.4 MB. Max. memory is 8.0 GB. [2021-05-02 16:58:05,118 INFO L168 Benchmark]: RCFGBuilder took 264.84 ms. Allocated memory is still 195.0 MB. Free memory was 177.3 MB in the beginning and 162.6 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-05-02 16:58:05,118 INFO L168 Benchmark]: TraceAbstraction took 199515.70 ms. Allocated memory was 195.0 MB in the beginning and 239.1 MB in the end (delta: 44.0 MB). Free memory was 162.1 MB in the beginning and 185.7 MB in the end (delta: -23.6 MB). Peak memory consumption was 20.4 MB. Max. memory is 8.0 GB. [2021-05-02 16:58:05,118 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 195.0 MB. Free memory is still 176.0 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 190.38 ms. Allocated memory is still 195.0 MB. Free memory was 159.4 MB in the beginning and 149.6 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 65.22 ms. Allocated memory is still 195.0 MB. Free memory was 149.6 MB in the beginning and 177.7 MB in the end (delta: -28.0 MB). Peak memory consumption was 3.4 MB. Max. memory is 8.0 GB. * RCFGBuilder took 264.84 ms. Allocated memory is still 195.0 MB. Free memory was 177.3 MB in the beginning and 162.6 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 199515.70 ms. Allocated memory was 195.0 MB in the beginning and 239.1 MB in the end (delta: 44.0 MB). Free memory was 162.1 MB in the beginning and 185.7 MB in the end (delta: -23.6 MB). Peak memory consumption was 20.4 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 12]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L17] int counter = 0; VAL [\old(counter)=15, counter=0] [L19] short k; [L20] long long y, x, c; [L21] k = __VERIFIER_nondet_short() [L23] y = 0 [L24] x = 0 [L25] c = 0 VAL [\old(counter)=0, c=0, counter=0, k=6, x=0, y=0] [L27] EXPR counter++ VAL [\old(counter)=0, c=0, counter=1, counter++=0, k=6, x=0, y=0] [L27] COND TRUE counter++<5 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, \old(counter)=0, counter=1] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=1] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(counter)=0, c=0, counter=1, k=6, x=0, y=0] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [\old(counter)=0, c=1, counter=1, k=6, x=1, y=1] [L27] EXPR counter++ VAL [\old(counter)=0, c=1, counter=2, counter++=1, k=6, x=1, y=1] [L27] COND TRUE counter++<5 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(counter)=0, c=1, counter=2, k=6, x=1, y=1] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [\old(counter)=0, c=2, counter=2, k=6, x=9, y=2] [L27] EXPR counter++ VAL [\old(counter)=0, c=2, counter=3, counter++=2, k=6, x=9, y=2] [L27] COND TRUE counter++<5 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, \old(counter)=0, counter=3] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=3] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(counter)=0, c=2, counter=3, k=6, x=9, y=2] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [\old(counter)=0, c=3, counter=3, k=6, x=36, y=3] [L27] EXPR counter++ VAL [\old(counter)=0, c=3, counter=4, counter++=3, k=6, x=36, y=3] [L27] COND TRUE counter++<5 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, \old(counter)=0, counter=4] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=4] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(counter)=0, c=3, counter=4, k=6, x=36, y=3] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [\old(counter)=0, c=4, counter=4, k=6, x=100, y=4] [L27] EXPR counter++ VAL [\old(counter)=0, c=4, counter=5, counter++=4, k=6, x=100, y=4] [L27] COND TRUE counter++<5 [L28] CALL __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(cond)=1, \old(counter)=0, counter=5] [L10] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=5] [L28] RET __VERIFIER_assert(4*x - y*y*y*y - 2*y*y*y - y*y == 0) VAL [\old(counter)=0, c=4, counter=5, k=6, x=100, y=4] [L30] COND FALSE !(!(c < k)) [L33] c = c + 1 [L34] y = y + 1 [L35] x = y * y * y + x VAL [\old(counter)=0, c=5, counter=5, k=6, x=225, y=5] [L27] EXPR counter++ VAL [\old(counter)=0, c=5, counter=6, counter++=5, k=6, x=225, y=5] [L27] COND FALSE !(counter++<5) [L37] CALL __VERIFIER_assert(k*y - (y*y) == 0) VAL [\old(cond)=0, \old(counter)=0, counter=6] [L10] COND TRUE !(cond) VAL [\old(cond)=0, \old(counter)=0, cond=0, counter=6] [L12] reach_error() VAL [\old(cond)=0, \old(counter)=0, cond=0, counter=6] - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 30 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 199435.1ms, OverallIterations: 15, TraceHistogramMax: 6, EmptinessCheckTime: 15.1ms, AutomataDifference: 193506.8ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 7.1ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 297 SDtfs, 91 SDslu, 1216 SDs, 0 SdLazy, 771 SolverSat, 36 SolverUnsat, 2 SolverUnknown, 0 SolverNotchecked, 192905.5ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 407 GetRequests, 299 SyntacticMatches, 4 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 722.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=55occurred in iteration=14, InterpolantAutomatonStates: 112, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 91.0ms AutomataMinimizationTime, 14 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 108.9ms SsaConstructionTime, 691.3ms SatisfiabilityAnalysisTime, 1501.9ms InterpolantComputationTime, 451 NumberOfCodeBlocks, 435 NumberOfCodeBlocksAsserted, 32 NumberOfCheckSat, 385 ConstructedInterpolants, 0 QuantifiedInterpolants, 1442 SizeOfPredicates, 37 NumberOfNonLiveVariables, 1909 ConjunctsInSsa, 214 ConjunctsInUnsatCore, 14 InterpolantComputations, 3 PerfectInterpolantSequences, 149/370 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 RESULT: Ultimate proved your program to be incorrect! Received shutdown request...