/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/egcd2-ll_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 14:51:40,623 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 14:51:40,625 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 14:51:40,664 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 14:51:40,683 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 14:51:40,685 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 14:51:40,686 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 14:51:40,688 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 14:51:40,690 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 14:51:40,691 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 14:51:40,693 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 14:51:40,698 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 14:51:40,699 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 14:51:40,700 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 14:51:40,701 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 14:51:40,704 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 14:51:40,711 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 14:51:40,719 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 14:51:40,734 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 14:51:40,735 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 14:51:40,739 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 14:51:40,774 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 14:51:40,774 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 14:51:40,777 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 14:51:40,778 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 14:51:40,778 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 14:51:40,778 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 14:51:40,778 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 14:51:40,778 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 14:51:40,778 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 14:51:40,779 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 14:51:40,779 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 14:51:40,780 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 14:51:40,780 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 14:51:40,780 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 14:51:40,780 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 14:51:40,780 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 14:51:40,780 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 14:51:40,780 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 14:51:40,780 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 14:51:40,781 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 14:51:40,781 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:51:40,781 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 14:51:40,781 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 14:51:40,781 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 14:51:40,781 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 14:51:40,782 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 14:51:40,782 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 14:51:40,782 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 14:51:40,782 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 14:51:41,075 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 14:51:41,094 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 14:51:41,096 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 14:51:41,097 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 14:51:41,098 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 14:51:41,098 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/egcd2-ll_unwindbound50.c [2021-05-02 14:51:41,171 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7370e36c8/277ea38477da4beb9bdf9090a13c187e/FLAG0812a087a [2021-05-02 14:51:41,534 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 14:51:41,534 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/egcd2-ll_unwindbound50.c [2021-05-02 14:51:41,539 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7370e36c8/277ea38477da4beb9bdf9090a13c187e/FLAG0812a087a [2021-05-02 14:51:41,954 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7370e36c8/277ea38477da4beb9bdf9090a13c187e [2021-05-02 14:51:41,956 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 14:51:41,959 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 14:51:41,962 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 14:51:41,962 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 14:51:41,965 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 14:51:41,966 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:51:41" (1/1) ... [2021-05-02 14:51:41,967 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@ccb811f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:41, skipping insertion in model container [2021-05-02 14:51:41,968 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:51:41" (1/1) ... [2021-05-02 14:51:41,974 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 14:51:41,990 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 14:51:42,096 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/egcd2-ll_unwindbound50.c[490,503] [2021-05-02 14:51:42,131 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:51:42,140 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 14:51:42,151 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/egcd2-ll_unwindbound50.c[490,503] [2021-05-02 14:51:42,180 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:51:42,193 INFO L208 MainTranslator]: Completed translation [2021-05-02 14:51:42,194 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:42 WrapperNode [2021-05-02 14:51:42,194 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 14:51:42,195 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 14:51:42,195 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 14:51:42,195 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 14:51:42,211 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:42" (1/1) ... [2021-05-02 14:51:42,211 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:42" (1/1) ... [2021-05-02 14:51:42,241 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:42" (1/1) ... [2021-05-02 14:51:42,242 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:42" (1/1) ... [2021-05-02 14:51:42,255 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:42" (1/1) ... [2021-05-02 14:51:42,259 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:42" (1/1) ... [2021-05-02 14:51:42,261 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:42" (1/1) ... [2021-05-02 14:51:42,262 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 14:51:42,263 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 14:51:42,263 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 14:51:42,263 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 14:51:42,264 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:42" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:51:42,330 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 14:51:42,331 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 14:51:42,331 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 14:51:42,331 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 14:51:42,331 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 14:51:42,331 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 14:51:42,332 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 14:51:42,332 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 14:51:42,332 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 14:51:42,333 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 14:51:42,333 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 14:51:42,333 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 14:51:42,333 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 14:51:42,334 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 14:51:42,335 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 14:51:42,335 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 14:51:42,335 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 14:51:42,335 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 14:51:42,335 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 14:51:42,336 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 14:51:42,592 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 14:51:42,592 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 14:51:42,594 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:51:42 BoogieIcfgContainer [2021-05-02 14:51:42,594 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 14:51:42,595 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 14:51:42,595 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 14:51:42,606 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 14:51:42,606 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 02:51:41" (1/3) ... [2021-05-02 14:51:42,607 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f533d2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:51:42, skipping insertion in model container [2021-05-02 14:51:42,607 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:42" (2/3) ... [2021-05-02 14:51:42,607 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f533d2b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:51:42, skipping insertion in model container [2021-05-02 14:51:42,607 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:51:42" (3/3) ... [2021-05-02 14:51:42,620 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd2-ll_unwindbound50.c [2021-05-02 14:51:42,626 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 14:51:42,629 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 14:51:42,646 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 14:51:42,668 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 14:51:42,668 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 14:51:42,668 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 14:51:42,668 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 14:51:42,669 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 14:51:42,669 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 14:51:42,669 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 14:51:42,669 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 14:51:42,682 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 23 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 14:51:42,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 14:51:42,687 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:42,687 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:42,688 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:42,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:42,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1950618521, now seen corresponding path program 1 times [2021-05-02 14:51:42,699 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:42,699 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1571383013] [2021-05-02 14:51:42,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:42,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:42,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 14:51:42,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:42,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 14:51:42,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:42,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 14:51:42,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:42,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 14:51:42,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:42,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 14:51:42,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:42,981 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 14:51:42,982 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:42,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1571383013] [2021-05-02 14:51:42,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1571383013] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:51:42,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:51:42,983 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:51:42,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181713255] [2021-05-02 14:51:42,988 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:51:42,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:42,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:51:43,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:51:43,001 INFO L87 Difference]: Start difference. First operand has 39 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 23 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:43,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:43,221 INFO L93 Difference]: Finished difference Result 72 states and 112 transitions. [2021-05-02 14:51:43,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:51:43,222 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 32 [2021-05-02 14:51:43,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:43,228 INFO L225 Difference]: With dead ends: 72 [2021-05-02 14:51:43,229 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 14:51:43,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 66.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:51:43,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 14:51:43,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 14:51:43,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 20 states have internal predecessors, (23), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 14:51:43,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 45 transitions. [2021-05-02 14:51:43,278 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 45 transitions. Word has length 32 [2021-05-02 14:51:43,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:43,279 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 45 transitions. [2021-05-02 14:51:43,279 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:43,279 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 45 transitions. [2021-05-02 14:51:43,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 14:51:43,281 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:43,281 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:43,281 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 14:51:43,282 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:43,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:43,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1734391985, now seen corresponding path program 1 times [2021-05-02 14:51:43,282 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:43,283 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1258954027] [2021-05-02 14:51:43,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:43,314 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:43,315 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1837731708] [2021-05-02 14:51:43,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:43,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:43,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 14:51:43,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:43,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:43,491 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:43,496 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:43,591 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:43,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:43,614 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 14:51:43,614 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:43,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1258954027] [2021-05-02 14:51:43,614 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:43,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837731708] [2021-05-02 14:51:43,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1837731708] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:51:43,615 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:51:43,615 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 14:51:43,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917958902] [2021-05-02 14:51:43,616 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 14:51:43,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:43,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 14:51:43,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 14:51:43,618 INFO L87 Difference]: Start difference. First operand 34 states and 45 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:43,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:43,635 INFO L93 Difference]: Finished difference Result 44 states and 56 transitions. [2021-05-02 14:51:43,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 14:51:43,636 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 33 [2021-05-02 14:51:43,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:43,637 INFO L225 Difference]: With dead ends: 44 [2021-05-02 14:51:43,637 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 14:51:43,638 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 16.1ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 14:51:43,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 14:51:43,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 14:51:43,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 20 states have (on average 1.25) internal successors, (25), 21 states have internal predecessors, (25), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 14:51:43,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 47 transitions. [2021-05-02 14:51:43,646 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 47 transitions. Word has length 33 [2021-05-02 14:51:43,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:43,647 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 47 transitions. [2021-05-02 14:51:43,647 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:43,647 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 47 transitions. [2021-05-02 14:51:43,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 14:51:43,648 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:43,648 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:43,869 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 14:51:43,869 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:43,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:43,870 INFO L82 PathProgramCache]: Analyzing trace with hash 2066454233, now seen corresponding path program 1 times [2021-05-02 14:51:43,870 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:43,870 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [195773450] [2021-05-02 14:51:43,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:43,886 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:43,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [638954120] [2021-05-02 14:51:43,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:43,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:43,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:51:43,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:44,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:44,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:44,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:44,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:44,135 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:44,178 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 14:51:44,179 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:44,179 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [195773450] [2021-05-02 14:51:44,179 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:44,179 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638954120] [2021-05-02 14:51:44,179 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638954120] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:44,179 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:44,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:51:44,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81884263] [2021-05-02 14:51:44,180 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:51:44,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:44,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:51:44,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:51:44,181 INFO L87 Difference]: Start difference. First operand 36 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:44,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:44,277 INFO L93 Difference]: Finished difference Result 53 states and 71 transitions. [2021-05-02 14:51:44,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:51:44,277 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2021-05-02 14:51:44,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:44,278 INFO L225 Difference]: With dead ends: 53 [2021-05-02 14:51:44,279 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 14:51:44,279 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 38.2ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:51:44,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 14:51:44,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 37. [2021-05-02 14:51:44,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 22 states have internal predecessors, (26), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 14:51:44,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 48 transitions. [2021-05-02 14:51:44,286 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 48 transitions. Word has length 34 [2021-05-02 14:51:44,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:44,287 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 48 transitions. [2021-05-02 14:51:44,287 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:44,287 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 48 transitions. [2021-05-02 14:51:44,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 14:51:44,288 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:44,288 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:44,504 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:44,505 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:44,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:44,505 INFO L82 PathProgramCache]: Analyzing trace with hash 1678606280, now seen corresponding path program 1 times [2021-05-02 14:51:44,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:44,506 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1188874442] [2021-05-02 14:51:44,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:44,530 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:44,530 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1921711552] [2021-05-02 14:51:44,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:44,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:44,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 14:51:44,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:44,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:44,691 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:44,703 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:44,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:44,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:44,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:44,773 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:44,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:44,797 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 14:51:44,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:44,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1188874442] [2021-05-02 14:51:44,797 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:44,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1921711552] [2021-05-02 14:51:44,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1921711552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:44,797 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:44,798 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:51:44,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440099770] [2021-05-02 14:51:44,798 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:51:44,798 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:44,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:51:44,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:51:44,799 INFO L87 Difference]: Start difference. First operand 37 states and 48 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:44,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:44,953 INFO L93 Difference]: Finished difference Result 59 states and 81 transitions. [2021-05-02 14:51:44,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:51:44,954 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2021-05-02 14:51:44,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:44,955 INFO L225 Difference]: With dead ends: 59 [2021-05-02 14:51:44,955 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 14:51:44,955 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 73.9ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:51:44,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 14:51:44,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2021-05-02 14:51:44,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 28 states have internal predecessors, (32), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 14:51:44,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 56 transitions. [2021-05-02 14:51:44,963 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 56 transitions. Word has length 36 [2021-05-02 14:51:44,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:44,963 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 56 transitions. [2021-05-02 14:51:44,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:44,963 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 56 transitions. [2021-05-02 14:51:44,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 14:51:44,964 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:44,964 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:45,176 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:45,177 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:45,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:45,177 INFO L82 PathProgramCache]: Analyzing trace with hash -2124209112, now seen corresponding path program 1 times [2021-05-02 14:51:45,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:45,178 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918235453] [2021-05-02 14:51:45,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:45,185 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:45,185 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [726523670] [2021-05-02 14:51:45,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:45,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:45,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:51:45,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:45,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,377 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 14:51:45,378 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:45,378 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918235453] [2021-05-02 14:51:45,378 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:45,378 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726523670] [2021-05-02 14:51:45,378 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726523670] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:51:45,379 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:51:45,379 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:51:45,380 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984599502] [2021-05-02 14:51:45,380 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:51:45,380 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:45,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:51:45,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:51:45,381 INFO L87 Difference]: Start difference. First operand 44 states and 56 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:45,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:45,436 INFO L93 Difference]: Finished difference Result 63 states and 83 transitions. [2021-05-02 14:51:45,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:51:45,437 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 39 [2021-05-02 14:51:45,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:45,443 INFO L225 Difference]: With dead ends: 63 [2021-05-02 14:51:45,443 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 14:51:45,444 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 9.3ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:51:45,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 14:51:45,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 14:51:45,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 28 states have internal predecessors, (31), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 14:51:45,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 55 transitions. [2021-05-02 14:51:45,457 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 55 transitions. Word has length 39 [2021-05-02 14:51:45,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:45,458 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 55 transitions. [2021-05-02 14:51:45,458 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:45,458 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 55 transitions. [2021-05-02 14:51:45,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 14:51:45,461 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:45,461 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:45,661 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:45,662 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:45,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:45,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1052701339, now seen corresponding path program 1 times [2021-05-02 14:51:45,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:45,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049355332] [2021-05-02 14:51:45,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:45,673 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:45,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1865182431] [2021-05-02 14:51:45,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:45,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:45,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 14:51:45,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:45,780 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,782 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,869 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,887 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:45,908 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 14:51:45,909 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:45,909 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049355332] [2021-05-02 14:51:45,909 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:45,909 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1865182431] [2021-05-02 14:51:45,909 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1865182431] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:45,909 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:45,909 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:51:45,909 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709092498] [2021-05-02 14:51:45,910 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:51:45,910 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:45,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:51:45,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:51:45,911 INFO L87 Difference]: Start difference. First operand 44 states and 55 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 14:51:46,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:46,017 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2021-05-02 14:51:46,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:51:46,018 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 41 [2021-05-02 14:51:46,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:46,020 INFO L225 Difference]: With dead ends: 58 [2021-05-02 14:51:46,020 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 14:51:46,021 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 47.6ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:51:46,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 14:51:46,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-02 14:51:46,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 32 states have (on average 1.21875) internal successors, (39), 34 states have internal predecessors, (39), 17 states have call successors, (17), 6 states have call predecessors, (17), 5 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 14:51:46,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 71 transitions. [2021-05-02 14:51:46,037 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 71 transitions. Word has length 41 [2021-05-02 14:51:46,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:46,038 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 71 transitions. [2021-05-02 14:51:46,038 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 14:51:46,038 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 71 transitions. [2021-05-02 14:51:46,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 14:51:46,039 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:46,039 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:46,245 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 14:51:46,245 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:46,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:46,245 INFO L82 PathProgramCache]: Analyzing trace with hash 1531994984, now seen corresponding path program 1 times [2021-05-02 14:51:46,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:46,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252458441] [2021-05-02 14:51:46,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:46,254 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:46,255 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1080427121] [2021-05-02 14:51:46,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:46,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:46,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 14:51:46,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:46,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,457 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-05-02 14:51:46,457 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:46,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252458441] [2021-05-02 14:51:46,457 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:46,457 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080427121] [2021-05-02 14:51:46,457 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1080427121] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:46,458 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:46,458 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:51:46,458 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350849476] [2021-05-02 14:51:46,458 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:51:46,458 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:46,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:51:46,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:51:46,459 INFO L87 Difference]: Start difference. First operand 55 states and 71 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 14:51:46,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:46,582 INFO L93 Difference]: Finished difference Result 62 states and 77 transitions. [2021-05-02 14:51:46,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:51:46,583 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2021-05-02 14:51:46,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:46,584 INFO L225 Difference]: With dead ends: 62 [2021-05-02 14:51:46,584 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 14:51:46,584 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 38.0ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:51:46,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 14:51:46,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2021-05-02 14:51:46,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 35 states have (on average 1.2) internal successors, (42), 37 states have internal predecessors, (42), 17 states have call successors, (17), 7 states have call predecessors, (17), 6 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 14:51:46,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 74 transitions. [2021-05-02 14:51:46,592 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 74 transitions. Word has length 46 [2021-05-02 14:51:46,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:46,593 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 74 transitions. [2021-05-02 14:51:46,593 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 14:51:46,593 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 74 transitions. [2021-05-02 14:51:46,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 14:51:46,594 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:46,594 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:46,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:46,801 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:46,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:46,801 INFO L82 PathProgramCache]: Analyzing trace with hash -300711301, now seen corresponding path program 1 times [2021-05-02 14:51:46,802 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:46,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325532606] [2021-05-02 14:51:46,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:46,810 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:46,811 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [55851424] [2021-05-02 14:51:46,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:46,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:46,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 14:51:46,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:46,923 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,952 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,964 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:46,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:47,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:47,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:47,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:47,018 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:47,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:47,050 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:47,071 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 14:51:47,072 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:47,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325532606] [2021-05-02 14:51:47,072 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:47,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55851424] [2021-05-02 14:51:47,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55851424] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:47,072 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:47,072 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:51:47,073 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1767463824] [2021-05-02 14:51:47,073 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:51:47,073 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:47,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:51:47,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:51:47,074 INFO L87 Difference]: Start difference. First operand 59 states and 74 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 14:51:49,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:49,275 INFO L93 Difference]: Finished difference Result 66 states and 80 transitions. [2021-05-02 14:51:49,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:51:49,275 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 51 [2021-05-02 14:51:49,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:49,276 INFO L225 Difference]: With dead ends: 66 [2021-05-02 14:51:49,276 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 14:51:49,277 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 81.7ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:51:49,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 14:51:49,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-02 14:51:49,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 40 states have internal predecessors, (45), 17 states have call successors, (17), 8 states have call predecessors, (17), 7 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 14:51:49,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 77 transitions. [2021-05-02 14:51:49,284 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 77 transitions. Word has length 51 [2021-05-02 14:51:49,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:49,285 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 77 transitions. [2021-05-02 14:51:49,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 14:51:49,285 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 77 transitions. [2021-05-02 14:51:49,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 14:51:49,285 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:49,286 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:49,508 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:49,509 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:49,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:49,509 INFO L82 PathProgramCache]: Analyzing trace with hash -2044027516, now seen corresponding path program 1 times [2021-05-02 14:51:49,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:49,509 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586712919] [2021-05-02 14:51:49,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:49,518 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:49,518 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [705441599] [2021-05-02 14:51:49,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:49,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:49,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 14:51:49,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:49,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:49,723 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-05-02 14:51:49,723 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:49,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586712919] [2021-05-02 14:51:49,723 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:49,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [705441599] [2021-05-02 14:51:49,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [705441599] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:49,723 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:49,723 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:51:49,724 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047787337] [2021-05-02 14:51:49,724 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:51:49,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:49,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:51:49,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:51:49,725 INFO L87 Difference]: Start difference. First operand 63 states and 77 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2021-05-02 14:51:49,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:49,850 INFO L93 Difference]: Finished difference Result 96 states and 131 transitions. [2021-05-02 14:51:49,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:51:49,850 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 59 [2021-05-02 14:51:49,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:49,852 INFO L225 Difference]: With dead ends: 96 [2021-05-02 14:51:49,852 INFO L226 Difference]: Without dead ends: 94 [2021-05-02 14:51:49,853 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 45.6ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:51:49,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-05-02 14:51:49,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 84. [2021-05-02 14:51:49,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 52 states have internal predecessors, (61), 26 states have call successors, (26), 9 states have call predecessors, (26), 8 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 14:51:49,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 111 transitions. [2021-05-02 14:51:49,870 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 111 transitions. Word has length 59 [2021-05-02 14:51:49,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:49,871 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 111 transitions. [2021-05-02 14:51:49,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 7 states have internal predecessors, (24), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) [2021-05-02 14:51:49,872 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 111 transitions. [2021-05-02 14:51:49,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 14:51:49,873 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:49,874 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:50,098 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 14:51:50,098 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:50,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:50,098 INFO L82 PathProgramCache]: Analyzing trace with hash 35160305, now seen corresponding path program 1 times [2021-05-02 14:51:50,098 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:50,099 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707566104] [2021-05-02 14:51:50,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:50,120 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:50,121 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1995224815] [2021-05-02 14:51:50,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:50,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:50,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:51:50,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:50,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,260 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,317 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-05-02 14:51:50,317 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:50,318 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707566104] [2021-05-02 14:51:50,318 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:50,318 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995224815] [2021-05-02 14:51:50,318 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995224815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:50,318 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:50,318 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:51:50,318 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008207962] [2021-05-02 14:51:50,318 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:51:50,318 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:50,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:51:50,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:51:50,319 INFO L87 Difference]: Start difference. First operand 84 states and 111 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 14:51:50,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:50,379 INFO L93 Difference]: Finished difference Result 107 states and 132 transitions. [2021-05-02 14:51:50,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 14:51:50,380 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 60 [2021-05-02 14:51:50,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:50,381 INFO L225 Difference]: With dead ends: 107 [2021-05-02 14:51:50,381 INFO L226 Difference]: Without dead ends: 99 [2021-05-02 14:51:50,382 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 19.5ms TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:51:50,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-05-02 14:51:50,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-05-02 14:51:50,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 61 states have (on average 1.1967213114754098) internal successors, (73), 64 states have internal predecessors, (73), 26 states have call successors, (26), 12 states have call predecessors, (26), 11 states have return successors, (24), 22 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 14:51:50,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 123 transitions. [2021-05-02 14:51:50,405 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 123 transitions. Word has length 60 [2021-05-02 14:51:50,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:50,405 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 123 transitions. [2021-05-02 14:51:50,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 5 states have internal predecessors, (22), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 14:51:50,405 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 123 transitions. [2021-05-02 14:51:50,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 14:51:50,408 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:50,408 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:50,624 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:50,625 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:50,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:50,625 INFO L82 PathProgramCache]: Analyzing trace with hash 1088000375, now seen corresponding path program 1 times [2021-05-02 14:51:50,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:50,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910851432] [2021-05-02 14:51:50,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:50,633 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:50,633 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [390811608] [2021-05-02 14:51:50,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:50,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:50,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:51:50,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:50,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,770 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,781 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,798 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,830 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,841 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:50,857 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 8 proven. 12 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-05-02 14:51:50,857 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:50,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910851432] [2021-05-02 14:51:50,857 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:50,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390811608] [2021-05-02 14:51:50,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390811608] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:50,858 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:50,858 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:51:50,858 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850676478] [2021-05-02 14:51:50,858 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:51:50,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:50,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:51:50,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:51:50,859 INFO L87 Difference]: Start difference. First operand 99 states and 123 transitions. Second operand has 8 states, 8 states have (on average 3.25) internal successors, (26), 7 states have internal predecessors, (26), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 14:51:51,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:51,060 INFO L93 Difference]: Finished difference Result 178 states and 253 transitions. [2021-05-02 14:51:51,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:51:51,061 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 7 states have internal predecessors, (26), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 61 [2021-05-02 14:51:51,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:51,064 INFO L225 Difference]: With dead ends: 178 [2021-05-02 14:51:51,064 INFO L226 Difference]: Without dead ends: 170 [2021-05-02 14:51:51,064 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 80.5ms TimeCoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:51:51,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-05-02 14:51:51,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 142. [2021-05-02 14:51:51,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 87 states have (on average 1.2873563218390804) internal successors, (112), 91 states have internal predecessors, (112), 43 states have call successors, (43), 12 states have call predecessors, (43), 11 states have return successors, (41), 38 states have call predecessors, (41), 41 states have call successors, (41) [2021-05-02 14:51:51,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 196 transitions. [2021-05-02 14:51:51,090 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 196 transitions. Word has length 61 [2021-05-02 14:51:51,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:51,091 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 196 transitions. [2021-05-02 14:51:51,091 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 7 states have internal predecessors, (26), 5 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 14:51:51,092 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 196 transitions. [2021-05-02 14:51:51,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-05-02 14:51:51,092 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:51,092 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:51,315 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:51,315 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:51,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:51,315 INFO L82 PathProgramCache]: Analyzing trace with hash 1537891564, now seen corresponding path program 1 times [2021-05-02 14:51:51,315 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:51,315 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2057370210] [2021-05-02 14:51:51,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:51,323 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:51,323 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [980428186] [2021-05-02 14:51:51,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:51,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:51,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:51:51,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:51,396 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,397 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,495 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-05-02 14:51:51,495 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:51,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2057370210] [2021-05-02 14:51:51,495 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:51,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980428186] [2021-05-02 14:51:51,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980428186] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:51,496 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:51,496 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:51:51,496 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762635662] [2021-05-02 14:51:51,496 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:51:51,496 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:51,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:51:51,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:51:51,497 INFO L87 Difference]: Start difference. First operand 142 states and 196 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 14:51:51,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:51,553 INFO L93 Difference]: Finished difference Result 175 states and 244 transitions. [2021-05-02 14:51:51,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 14:51:51,553 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 62 [2021-05-02 14:51:51,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:51,555 INFO L225 Difference]: With dead ends: 175 [2021-05-02 14:51:51,555 INFO L226 Difference]: Without dead ends: 142 [2021-05-02 14:51:51,555 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 17.8ms TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:51:51,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-05-02 14:51:51,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2021-05-02 14:51:51,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 87 states have (on average 1.2758620689655173) internal successors, (111), 91 states have internal predecessors, (111), 43 states have call successors, (43), 12 states have call predecessors, (43), 11 states have return successors, (41), 38 states have call predecessors, (41), 41 states have call successors, (41) [2021-05-02 14:51:51,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 195 transitions. [2021-05-02 14:51:51,568 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 195 transitions. Word has length 62 [2021-05-02 14:51:51,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:51,568 INFO L480 AbstractCegarLoop]: Abstraction has 142 states and 195 transitions. [2021-05-02 14:51:51,569 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 14:51:51,569 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 195 transitions. [2021-05-02 14:51:51,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-02 14:51:51,569 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:51,569 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:51,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 14:51:51,789 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:51,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:51,790 INFO L82 PathProgramCache]: Analyzing trace with hash -385934262, now seen corresponding path program 1 times [2021-05-02 14:51:51,790 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:51,790 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616003318] [2021-05-02 14:51:51,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:51,795 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:51,795 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1622203054] [2021-05-02 14:51:51,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:51,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:51,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:51:51,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:51,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,992 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:51,993 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,005 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,023 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 13 proven. 5 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-05-02 14:51:52,023 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:52,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616003318] [2021-05-02 14:51:52,023 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:52,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622203054] [2021-05-02 14:51:52,023 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1622203054] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:52,023 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:52,024 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:51:52,024 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714023656] [2021-05-02 14:51:52,024 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:51:52,024 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:52,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:51:52,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:51:52,026 INFO L87 Difference]: Start difference. First operand 142 states and 195 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 14:51:52,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:52,128 INFO L93 Difference]: Finished difference Result 245 states and 345 transitions. [2021-05-02 14:51:52,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:51:52,128 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 66 [2021-05-02 14:51:52,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:52,130 INFO L225 Difference]: With dead ends: 245 [2021-05-02 14:51:52,130 INFO L226 Difference]: Without dead ends: 169 [2021-05-02 14:51:52,134 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 34.3ms TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:51:52,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-05-02 14:51:52,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 167. [2021-05-02 14:51:52,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 105 states have (on average 1.2380952380952381) internal successors, (130), 108 states have internal predecessors, (130), 46 states have call successors, (46), 16 states have call predecessors, (46), 15 states have return successors, (44), 42 states have call predecessors, (44), 44 states have call successors, (44) [2021-05-02 14:51:52,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 220 transitions. [2021-05-02 14:51:52,150 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 220 transitions. Word has length 66 [2021-05-02 14:51:52,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:52,150 INFO L480 AbstractCegarLoop]: Abstraction has 167 states and 220 transitions. [2021-05-02 14:51:52,150 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 14:51:52,150 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 220 transitions. [2021-05-02 14:51:52,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 14:51:52,151 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:52,151 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:52,369 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 14:51:52,369 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:52,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:52,369 INFO L82 PathProgramCache]: Analyzing trace with hash 792554045, now seen corresponding path program 1 times [2021-05-02 14:51:52,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:52,370 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283515725] [2021-05-02 14:51:52,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:52,377 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:52,377 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [498470377] [2021-05-02 14:51:52,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:52,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:52,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 14:51:52,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:52,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,501 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,509 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,583 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,593 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:52,615 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 22 proven. 16 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-05-02 14:51:52,615 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:52,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283515725] [2021-05-02 14:51:52,615 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:52,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [498470377] [2021-05-02 14:51:52,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [498470377] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:52,616 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:52,616 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 14:51:52,616 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582804908] [2021-05-02 14:51:52,616 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 14:51:52,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:52,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 14:51:52,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:51:52,617 INFO L87 Difference]: Start difference. First operand 167 states and 220 transitions. Second operand has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 14:51:52,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:52,850 INFO L93 Difference]: Finished difference Result 202 states and 269 transitions. [2021-05-02 14:51:52,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:51:52,851 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 68 [2021-05-02 14:51:52,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:52,853 INFO L225 Difference]: With dead ends: 202 [2021-05-02 14:51:52,853 INFO L226 Difference]: Without dead ends: 199 [2021-05-02 14:51:52,853 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 87.8ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:51:52,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-05-02 14:51:52,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 196. [2021-05-02 14:51:52,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 126 states have (on average 1.2619047619047619) internal successors, (159), 133 states have internal predecessors, (159), 53 states have call successors, (53), 17 states have call predecessors, (53), 16 states have return successors, (50), 45 states have call predecessors, (50), 50 states have call successors, (50) [2021-05-02 14:51:52,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 262 transitions. [2021-05-02 14:51:52,872 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 262 transitions. Word has length 68 [2021-05-02 14:51:52,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:52,872 INFO L480 AbstractCegarLoop]: Abstraction has 196 states and 262 transitions. [2021-05-02 14:51:52,872 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 10 states have internal predecessors, (31), 4 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 14:51:52,872 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 262 transitions. [2021-05-02 14:51:52,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 14:51:52,873 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:52,873 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:53,081 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 14:51:53,082 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:53,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:53,082 INFO L82 PathProgramCache]: Analyzing trace with hash 783638790, now seen corresponding path program 2 times [2021-05-02 14:51:53,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:53,082 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499296354] [2021-05-02 14:51:53,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:53,089 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:53,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [136466856] [2021-05-02 14:51:53,089 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:53,144 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:51:53,144 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:51:53,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 14:51:53,146 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:53,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,191 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,227 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,229 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,230 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,241 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,292 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,317 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,365 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,387 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,388 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,389 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,413 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 12 proven. 20 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-05-02 14:51:53,413 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:53,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499296354] [2021-05-02 14:51:53,413 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:53,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [136466856] [2021-05-02 14:51:53,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [136466856] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:53,413 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:53,414 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 14:51:53,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [218166879] [2021-05-02 14:51:53,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 14:51:53,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:53,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 14:51:53,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:51:53,415 INFO L87 Difference]: Start difference. First operand 196 states and 262 transitions. Second operand has 11 states, 10 states have (on average 2.8) internal successors, (28), 8 states have internal predecessors, (28), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 14:51:53,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:53,647 INFO L93 Difference]: Finished difference Result 224 states and 301 transitions. [2021-05-02 14:51:53,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:51:53,647 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 8 states have internal predecessors, (28), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) Word has length 73 [2021-05-02 14:51:53,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:53,649 INFO L225 Difference]: With dead ends: 224 [2021-05-02 14:51:53,649 INFO L226 Difference]: Without dead ends: 222 [2021-05-02 14:51:53,649 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 112.3ms TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-02 14:51:53,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2021-05-02 14:51:53,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 219. [2021-05-02 14:51:53,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 219 states, 138 states have (on average 1.2681159420289856) internal successors, (175), 146 states have internal predecessors, (175), 62 states have call successors, (62), 19 states have call predecessors, (62), 18 states have return successors, (59), 53 states have call predecessors, (59), 59 states have call successors, (59) [2021-05-02 14:51:53,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 219 states to 219 states and 296 transitions. [2021-05-02 14:51:53,669 INFO L78 Accepts]: Start accepts. Automaton has 219 states and 296 transitions. Word has length 73 [2021-05-02 14:51:53,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:53,669 INFO L480 AbstractCegarLoop]: Abstraction has 219 states and 296 transitions. [2021-05-02 14:51:53,669 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.8) internal successors, (28), 8 states have internal predecessors, (28), 5 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 6 states have call predecessors, (11), 5 states have call successors, (11) [2021-05-02 14:51:53,669 INFO L276 IsEmpty]: Start isEmpty. Operand 219 states and 296 transitions. [2021-05-02 14:51:53,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 14:51:53,670 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:53,670 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:53,881 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:53,881 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:53,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:53,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1625446301, now seen corresponding path program 3 times [2021-05-02 14:51:53,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:53,881 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465683907] [2021-05-02 14:51:53,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:53,886 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:53,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [798160158] [2021-05-02 14:51:53,886 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:53,945 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:51:53,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:51:53,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 49 conjunts are in the unsatisfiable core [2021-05-02 14:51:53,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:53,988 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:53,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,089 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,098 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,208 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,264 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,271 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,279 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,281 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,286 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,294 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,298 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,302 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,308 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,311 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:54,345 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 31 proven. 19 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-05-02 14:51:54,345 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:54,345 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [465683907] [2021-05-02 14:51:54,346 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:54,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [798160158] [2021-05-02 14:51:54,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [798160158] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:54,346 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:54,346 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 14:51:54,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1196582953] [2021-05-02 14:51:54,346 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 14:51:54,346 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:54,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 14:51:54,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:51:54,347 INFO L87 Difference]: Start difference. First operand 219 states and 296 transitions. Second operand has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 12 states have internal predecessors, (31), 6 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-02 14:51:54,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:54,759 INFO L93 Difference]: Finished difference Result 228 states and 304 transitions. [2021-05-02 14:51:54,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 14:51:54,760 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 12 states have internal predecessors, (31), 6 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) Word has length 78 [2021-05-02 14:51:54,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:54,761 INFO L225 Difference]: With dead ends: 228 [2021-05-02 14:51:54,761 INFO L226 Difference]: Without dead ends: 226 [2021-05-02 14:51:54,762 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 251.5ms TimeCoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2021-05-02 14:51:54,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2021-05-02 14:51:54,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 223. [2021-05-02 14:51:54,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 223 states, 141 states have (on average 1.2624113475177305) internal successors, (178), 149 states have internal predecessors, (178), 62 states have call successors, (62), 20 states have call predecessors, (62), 19 states have return successors, (59), 53 states have call predecessors, (59), 59 states have call successors, (59) [2021-05-02 14:51:54,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 299 transitions. [2021-05-02 14:51:54,782 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 299 transitions. Word has length 78 [2021-05-02 14:51:54,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:54,783 INFO L480 AbstractCegarLoop]: Abstraction has 223 states and 299 transitions. [2021-05-02 14:51:54,783 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 12 states have internal predecessors, (31), 6 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-02 14:51:54,783 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 299 transitions. [2021-05-02 14:51:54,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-05-02 14:51:54,784 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:54,784 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:54,996 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 14:51:54,997 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:54,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:54,997 INFO L82 PathProgramCache]: Analyzing trace with hash -1849570232, now seen corresponding path program 2 times [2021-05-02 14:51:54,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:54,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210823381] [2021-05-02 14:51:54,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:55,005 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:55,005 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [48794207] [2021-05-02 14:51:55,005 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:55,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:51:55,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:51:55,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 48 conjunts are in the unsatisfiable core [2021-05-02 14:51:55,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:55,130 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,160 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,161 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,209 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,210 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,221 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,222 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,234 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,235 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,244 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,245 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,284 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,319 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,390 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:55,419 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 41 proven. 36 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2021-05-02 14:51:55,419 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:55,419 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210823381] [2021-05-02 14:51:55,419 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:55,419 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [48794207] [2021-05-02 14:51:55,419 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [48794207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:55,419 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:55,420 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 14:51:55,420 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996323586] [2021-05-02 14:51:55,420 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 14:51:55,420 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:55,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 14:51:55,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:51:55,421 INFO L87 Difference]: Start difference. First operand 223 states and 299 transitions. Second operand has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 7 states have call predecessors, (13), 6 states have call successors, (13) [2021-05-02 14:51:55,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:55,807 INFO L93 Difference]: Finished difference Result 237 states and 317 transitions. [2021-05-02 14:51:55,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 14:51:55,808 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 7 states have call predecessors, (13), 6 states have call successors, (13) Word has length 82 [2021-05-02 14:51:55,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:55,809 INFO L225 Difference]: With dead ends: 237 [2021-05-02 14:51:55,809 INFO L226 Difference]: Without dead ends: 235 [2021-05-02 14:51:55,810 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 211.1ms TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-02 14:51:55,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 235 states. [2021-05-02 14:51:55,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 235 to 228. [2021-05-02 14:51:55,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 228 states, 144 states have (on average 1.2569444444444444) internal successors, (181), 153 states have internal predecessors, (181), 63 states have call successors, (63), 21 states have call predecessors, (63), 20 states have return successors, (60), 53 states have call predecessors, (60), 60 states have call successors, (60) [2021-05-02 14:51:55,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 228 states to 228 states and 304 transitions. [2021-05-02 14:51:55,830 INFO L78 Accepts]: Start accepts. Automaton has 228 states and 304 transitions. Word has length 82 [2021-05-02 14:51:55,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:55,830 INFO L480 AbstractCegarLoop]: Abstraction has 228 states and 304 transitions. [2021-05-02 14:51:55,830 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 2.142857142857143) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (15), 2 states have call predecessors, (15), 3 states have return successors, (13), 7 states have call predecessors, (13), 6 states have call successors, (13) [2021-05-02 14:51:55,830 INFO L276 IsEmpty]: Start isEmpty. Operand 228 states and 304 transitions. [2021-05-02 14:51:55,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-02 14:51:55,831 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:55,831 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:56,048 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:56,049 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:56,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:56,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1768368813, now seen corresponding path program 1 times [2021-05-02 14:51:56,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:56,049 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1223215055] [2021-05-02 14:51:56,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:56,056 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:56,056 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1329357488] [2021-05-02 14:51:56,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:56,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:56,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 14:51:56,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:56,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,140 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,141 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,188 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,273 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 16 proven. 73 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-05-02 14:51:56,273 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:56,273 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1223215055] [2021-05-02 14:51:56,273 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:56,273 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329357488] [2021-05-02 14:51:56,273 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1329357488] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:56,273 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:56,274 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:51:56,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536528185] [2021-05-02 14:51:56,274 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:51:56,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:56,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:51:56,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:51:56,275 INFO L87 Difference]: Start difference. First operand 228 states and 304 transitions. Second operand has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 14:51:56,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:56,382 INFO L93 Difference]: Finished difference Result 238 states and 314 transitions. [2021-05-02 14:51:56,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:51:56,383 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 83 [2021-05-02 14:51:56,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:56,384 INFO L225 Difference]: With dead ends: 238 [2021-05-02 14:51:56,384 INFO L226 Difference]: Without dead ends: 231 [2021-05-02 14:51:56,385 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 28.5ms TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:51:56,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-05-02 14:51:56,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2021-05-02 14:51:56,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 147 states have (on average 1.251700680272109) internal successors, (184), 156 states have internal predecessors, (184), 63 states have call successors, (63), 21 states have call predecessors, (63), 20 states have return successors, (60), 53 states have call predecessors, (60), 60 states have call successors, (60) [2021-05-02 14:51:56,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 307 transitions. [2021-05-02 14:51:56,404 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 307 transitions. Word has length 83 [2021-05-02 14:51:56,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:56,405 INFO L480 AbstractCegarLoop]: Abstraction has 231 states and 307 transitions. [2021-05-02 14:51:56,405 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.0) internal successors, (28), 6 states have internal predecessors, (28), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 14:51:56,405 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 307 transitions. [2021-05-02 14:51:56,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-05-02 14:51:56,406 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:56,406 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:56,628 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-05-02 14:51:56,628 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:56,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:56,629 INFO L82 PathProgramCache]: Analyzing trace with hash -1017110725, now seen corresponding path program 1 times [2021-05-02 14:51:56,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:56,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709290452] [2021-05-02 14:51:56,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:56,635 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:56,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1278265009] [2021-05-02 14:51:56,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:56,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:56,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 45 conjunts are in the unsatisfiable core [2021-05-02 14:51:56,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:56,735 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,736 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,854 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,855 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,913 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,926 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,936 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,938 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,948 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:56,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,084 INFO L134 CoverageAnalysis]: Checked inductivity of 162 backedges. 16 proven. 19 refuted. 0 times theorem prover too weak. 127 trivial. 0 not checked. [2021-05-02 14:51:57,085 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:57,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709290452] [2021-05-02 14:51:57,085 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:57,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1278265009] [2021-05-02 14:51:57,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1278265009] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:57,085 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:57,085 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 14:51:57,085 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748225580] [2021-05-02 14:51:57,085 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 14:51:57,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:57,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 14:51:57,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:51:57,086 INFO L87 Difference]: Start difference. First operand 231 states and 307 transitions. Second operand has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 6 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-02 14:51:57,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:57,553 INFO L93 Difference]: Finished difference Result 263 states and 352 transitions. [2021-05-02 14:51:57,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 14:51:57,554 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 6 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) Word has length 84 [2021-05-02 14:51:57,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:57,555 INFO L225 Difference]: With dead ends: 263 [2021-05-02 14:51:57,556 INFO L226 Difference]: Without dead ends: 260 [2021-05-02 14:51:57,556 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 296.0ms TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-02 14:51:57,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2021-05-02 14:51:57,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 257. [2021-05-02 14:51:57,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 257 states, 162 states have (on average 1.2592592592592593) internal successors, (204), 172 states have internal predecessors, (204), 72 states have call successors, (72), 23 states have call predecessors, (72), 22 states have return successors, (69), 61 states have call predecessors, (69), 69 states have call successors, (69) [2021-05-02 14:51:57,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 257 states to 257 states and 345 transitions. [2021-05-02 14:51:57,579 INFO L78 Accepts]: Start accepts. Automaton has 257 states and 345 transitions. Word has length 84 [2021-05-02 14:51:57,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:57,579 INFO L480 AbstractCegarLoop]: Abstraction has 257 states and 345 transitions. [2021-05-02 14:51:57,579 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 11 states have internal predecessors, (29), 6 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 5 states have call predecessors, (13), 5 states have call successors, (13) [2021-05-02 14:51:57,579 INFO L276 IsEmpty]: Start isEmpty. Operand 257 states and 345 transitions. [2021-05-02 14:51:57,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-05-02 14:51:57,580 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:57,581 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:57,796 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-02 14:51:57,797 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:57,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:57,797 INFO L82 PathProgramCache]: Analyzing trace with hash 1676300815, now seen corresponding path program 2 times [2021-05-02 14:51:57,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:57,797 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156817588] [2021-05-02 14:51:57,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:57,803 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:57,804 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1201854420] [2021-05-02 14:51:57,804 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:57,869 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:51:57,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:51:57,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 291 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 14:51:57,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:57,881 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,882 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,932 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,940 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,978 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:57,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,039 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 16 proven. 79 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-05-02 14:51:58,039 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:58,039 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156817588] [2021-05-02 14:51:58,039 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:58,039 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1201854420] [2021-05-02 14:51:58,039 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1201854420] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:58,040 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:58,040 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:51:58,040 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920139346] [2021-05-02 14:51:58,040 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:51:58,040 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:58,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:51:58,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:51:58,041 INFO L87 Difference]: Start difference. First operand 257 states and 345 transitions. Second operand has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 14:51:58,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:58,161 INFO L93 Difference]: Finished difference Result 299 states and 386 transitions. [2021-05-02 14:51:58,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:51:58,162 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 87 [2021-05-02 14:51:58,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:58,163 INFO L225 Difference]: With dead ends: 299 [2021-05-02 14:51:58,163 INFO L226 Difference]: Without dead ends: 292 [2021-05-02 14:51:58,163 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 41.8ms TimeCoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:51:58,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2021-05-02 14:51:58,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 291. [2021-05-02 14:51:58,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 187 states have (on average 1.2299465240641712) internal successors, (230), 196 states have internal predecessors, (230), 75 states have call successors, (75), 29 states have call predecessors, (75), 28 states have return successors, (72), 65 states have call predecessors, (72), 72 states have call successors, (72) [2021-05-02 14:51:58,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 377 transitions. [2021-05-02 14:51:58,184 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 377 transitions. Word has length 87 [2021-05-02 14:51:58,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:58,184 INFO L480 AbstractCegarLoop]: Abstraction has 291 states and 377 transitions. [2021-05-02 14:51:58,184 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.0) internal successors, (32), 7 states have internal predecessors, (32), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 14:51:58,185 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 377 transitions. [2021-05-02 14:51:58,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-05-02 14:51:58,185 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:58,185 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:58,400 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-05-02 14:51:58,401 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:58,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:58,401 INFO L82 PathProgramCache]: Analyzing trace with hash -201422586, now seen corresponding path program 1 times [2021-05-02 14:51:58,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:58,402 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1715288174] [2021-05-02 14:51:58,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:58,409 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:58,409 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1836901213] [2021-05-02 14:51:58,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:58,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:58,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 13 conjunts are in the unsatisfiable core [2021-05-02 14:51:58,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:58,537 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,538 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,570 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,572 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,582 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,659 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,672 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:58,686 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 21 proven. 78 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-05-02 14:51:58,686 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:58,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1715288174] [2021-05-02 14:51:58,686 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:58,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1836901213] [2021-05-02 14:51:58,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1836901213] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:58,686 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:58,686 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:51:58,686 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604069650] [2021-05-02 14:51:58,687 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:51:58,687 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:58,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:51:58,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:51:58,688 INFO L87 Difference]: Start difference. First operand 291 states and 377 transitions. Second operand has 8 states, 8 states have (on average 4.25) internal successors, (34), 7 states have internal predecessors, (34), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 14:51:58,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:58,813 INFO L93 Difference]: Finished difference Result 398 states and 543 transitions. [2021-05-02 14:51:58,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:51:58,813 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 7 states have internal predecessors, (34), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 89 [2021-05-02 14:51:58,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:58,815 INFO L225 Difference]: With dead ends: 398 [2021-05-02 14:51:58,815 INFO L226 Difference]: Without dead ends: 293 [2021-05-02 14:51:58,816 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 42.8ms TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:51:58,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2021-05-02 14:51:58,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 293. [2021-05-02 14:51:58,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 189 states have (on average 1.216931216931217) internal successors, (230), 198 states have internal predecessors, (230), 75 states have call successors, (75), 29 states have call predecessors, (75), 28 states have return successors, (72), 65 states have call predecessors, (72), 72 states have call successors, (72) [2021-05-02 14:51:58,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 377 transitions. [2021-05-02 14:51:58,836 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 377 transitions. Word has length 89 [2021-05-02 14:51:58,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:58,837 INFO L480 AbstractCegarLoop]: Abstraction has 293 states and 377 transitions. [2021-05-02 14:51:58,838 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 4.25) internal successors, (34), 7 states have internal predecessors, (34), 5 states have call successors, (15), 5 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 14:51:58,838 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 377 transitions. [2021-05-02 14:51:58,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-05-02 14:51:58,839 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:58,839 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:59,052 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-05-02 14:51:59,053 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:59,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:59,053 INFO L82 PathProgramCache]: Analyzing trace with hash 325787368, now seen corresponding path program 2 times [2021-05-02 14:51:59,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:59,053 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024941276] [2021-05-02 14:51:59,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:59,059 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:59,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [41555856] [2021-05-02 14:51:59,060 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:59,142 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:51:59,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:51:59,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 14:51:59,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:59,217 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,218 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,219 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,228 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,238 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,246 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,247 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,255 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,263 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,284 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 42 proven. 0 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2021-05-02 14:51:59,284 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:59,284 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024941276] [2021-05-02 14:51:59,284 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:59,285 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41555856] [2021-05-02 14:51:59,285 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41555856] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:51:59,285 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:51:59,285 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:51:59,285 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446789508] [2021-05-02 14:51:59,285 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:51:59,285 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:59,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:51:59,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:51:59,286 INFO L87 Difference]: Start difference. First operand 293 states and 377 transitions. Second operand has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-05-02 14:51:59,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:59,367 INFO L93 Difference]: Finished difference Result 451 states and 628 transitions. [2021-05-02 14:51:59,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:51:59,368 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) Word has length 93 [2021-05-02 14:51:59,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:59,370 INFO L225 Difference]: With dead ends: 451 [2021-05-02 14:51:59,370 INFO L226 Difference]: Without dead ends: 343 [2021-05-02 14:51:59,371 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 21.7ms TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:51:59,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 343 states. [2021-05-02 14:51:59,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 343 to 310. [2021-05-02 14:51:59,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 200 states have (on average 1.225) internal successors, (245), 208 states have internal predecessors, (245), 81 states have call successors, (81), 29 states have call predecessors, (81), 28 states have return successors, (78), 72 states have call predecessors, (78), 78 states have call successors, (78) [2021-05-02 14:51:59,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 404 transitions. [2021-05-02 14:51:59,396 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 404 transitions. Word has length 93 [2021-05-02 14:51:59,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:59,396 INFO L480 AbstractCegarLoop]: Abstraction has 310 states and 404 transitions. [2021-05-02 14:51:59,396 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 3 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (13), 2 states have call predecessors, (13), 2 states have call successors, (13) [2021-05-02 14:51:59,396 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 404 transitions. [2021-05-02 14:51:59,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-05-02 14:51:59,397 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:59,397 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:51:59,619 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-05-02 14:51:59,619 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:59,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:59,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1415088729, now seen corresponding path program 1 times [2021-05-02 14:51:59,620 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:59,620 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222401167] [2021-05-02 14:51:59,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:59,628 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:59,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1073501790] [2021-05-02 14:51:59,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:59,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:59,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 73 conjunts are in the unsatisfiable core [2021-05-02 14:51:59,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:59,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,729 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,768 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,813 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,822 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,833 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,894 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,896 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,989 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:59,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,027 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,236 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,239 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,267 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,269 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,304 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,310 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,327 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,329 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,335 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:00,372 INFO L134 CoverageAnalysis]: Checked inductivity of 288 backedges. 84 proven. 53 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2021-05-02 14:52:00,373 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:52:00,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222401167] [2021-05-02 14:52:00,373 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:52:00,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073501790] [2021-05-02 14:52:00,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1073501790] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:52:00,373 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:52:00,373 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 14:52:00,373 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891151846] [2021-05-02 14:52:00,374 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 14:52:00,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:52:00,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 14:52:00,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-02 14:52:00,374 INFO L87 Difference]: Start difference. First operand 310 states and 404 transitions. Second operand has 16 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (16), 8 states have call predecessors, (16), 7 states have call successors, (16) [2021-05-02 14:52:03,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:52:03,105 INFO L93 Difference]: Finished difference Result 320 states and 413 transitions. [2021-05-02 14:52:03,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 14:52:03,106 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (16), 8 states have call predecessors, (16), 7 states have call successors, (16) Word has length 101 [2021-05-02 14:52:03,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:52:03,108 INFO L225 Difference]: With dead ends: 320 [2021-05-02 14:52:03,108 INFO L226 Difference]: Without dead ends: 318 [2021-05-02 14:52:03,108 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 522.4ms TimeCoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-05-02 14:52:03,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-05-02 14:52:03,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 314. [2021-05-02 14:52:03,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 314 states, 203 states have (on average 1.2216748768472907) internal successors, (248), 211 states have internal predecessors, (248), 81 states have call successors, (81), 30 states have call predecessors, (81), 29 states have return successors, (78), 72 states have call predecessors, (78), 78 states have call successors, (78) [2021-05-02 14:52:03,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 407 transitions. [2021-05-02 14:52:03,131 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 407 transitions. Word has length 101 [2021-05-02 14:52:03,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:52:03,132 INFO L480 AbstractCegarLoop]: Abstraction has 314 states and 407 transitions. [2021-05-02 14:52:03,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 2.2666666666666666) internal successors, (34), 12 states have internal predecessors, (34), 7 states have call successors, (18), 2 states have call predecessors, (18), 3 states have return successors, (16), 8 states have call predecessors, (16), 7 states have call successors, (16) [2021-05-02 14:52:03,132 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 407 transitions. [2021-05-02 14:52:03,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2021-05-02 14:52:03,133 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:52:03,133 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:52:03,352 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:03,353 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:52:03,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:52:03,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1524088572, now seen corresponding path program 3 times [2021-05-02 14:52:03,353 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:52:03,353 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1561781762] [2021-05-02 14:52:03,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:52:03,360 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:52:03,360 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1494456752] [2021-05-02 14:52:03,360 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:03,430 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 14:52:03,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:52:03,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 37 conjunts are in the unsatisfiable core [2021-05-02 14:52:03,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:52:03,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,472 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,483 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,517 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,526 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,536 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,544 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,576 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,577 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,585 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,586 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,595 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,596 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,605 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,628 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,656 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,658 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,704 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,707 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,711 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,713 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,719 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,720 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,753 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,756 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,774 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,785 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,791 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,797 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,799 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,810 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,836 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,848 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,849 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:03,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,021 WARN L205 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 31 [2021-05-02 14:52:04,029 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,048 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,054 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,056 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,057 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,068 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,071 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,083 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,099 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,107 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,115 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,139 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,142 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,148 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,149 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,154 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,156 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,157 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,167 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,171 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,172 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,179 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,180 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,207 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,337 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,347 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,353 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,355 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,361 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,366 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,369 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,372 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,381 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,386 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:04,428 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 67 proven. 56 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2021-05-02 14:52:04,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:52:04,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1561781762] [2021-05-02 14:52:04,429 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:52:04,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494456752] [2021-05-02 14:52:04,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494456752] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:52:04,429 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:52:04,429 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 14:52:04,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121837699] [2021-05-02 14:52:04,429 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 14:52:04,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:52:04,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 14:52:04,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2021-05-02 14:52:04,430 INFO L87 Difference]: Start difference. First operand 314 states and 407 transitions. Second operand has 16 states, 16 states have (on average 2.0625) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-02 14:52:07,098 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 16 [2021-05-02 14:52:08,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:52:08,565 INFO L93 Difference]: Finished difference Result 328 states and 425 transitions. [2021-05-02 14:52:08,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 14:52:08,565 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) Word has length 105 [2021-05-02 14:52:08,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:52:08,567 INFO L225 Difference]: With dead ends: 328 [2021-05-02 14:52:08,567 INFO L226 Difference]: Without dead ends: 326 [2021-05-02 14:52:08,568 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 717.7ms TimeCoverageRelationStatistics Valid=63, Invalid=357, Unknown=0, NotChecked=0, Total=420 [2021-05-02 14:52:08,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2021-05-02 14:52:08,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 319. [2021-05-02 14:52:08,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 206 states have (on average 1.2184466019417475) internal successors, (251), 215 states have internal predecessors, (251), 82 states have call successors, (82), 31 states have call predecessors, (82), 30 states have return successors, (79), 72 states have call predecessors, (79), 79 states have call successors, (79) [2021-05-02 14:52:08,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 412 transitions. [2021-05-02 14:52:08,591 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 412 transitions. Word has length 105 [2021-05-02 14:52:08,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:52:08,592 INFO L480 AbstractCegarLoop]: Abstraction has 319 states and 412 transitions. [2021-05-02 14:52:08,592 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 12 states have internal predecessors, (33), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 7 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-02 14:52:08,592 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 412 transitions. [2021-05-02 14:52:08,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 14:52:08,593 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:52:08,593 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:52:08,808 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-05-02 14:52:08,809 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:52:08,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:52:08,809 INFO L82 PathProgramCache]: Analyzing trace with hash -1761848073, now seen corresponding path program 2 times [2021-05-02 14:52:08,809 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:52:08,809 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382347788] [2021-05-02 14:52:08,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:52:08,815 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:52:08,815 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1118739559] [2021-05-02 14:52:08,815 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:08,884 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:52:08,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:52:08,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 66 conjunts are in the unsatisfiable core [2021-05-02 14:52:08,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:52:08,941 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:08,942 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,025 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,039 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,040 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,137 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,138 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,152 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,287 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,425 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,473 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,609 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,737 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,740 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,779 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:09,972 WARN L205 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2021-05-02 14:52:10,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:10,183 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:10,308 INFO L134 CoverageAnalysis]: Checked inductivity of 336 backedges. 69 proven. 69 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2021-05-02 14:52:10,308 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:52:10,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382347788] [2021-05-02 14:52:10,308 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:52:10,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1118739559] [2021-05-02 14:52:10,308 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1118739559] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:52:10,308 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:52:10,308 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2021-05-02 14:52:10,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256017778] [2021-05-02 14:52:10,309 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-02 14:52:10,309 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:52:10,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-02 14:52:10,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2021-05-02 14:52:10,310 INFO L87 Difference]: Start difference. First operand 319 states and 412 transitions. Second operand has 17 states, 16 states have (on average 2.1875) internal successors, (35), 14 states have internal predecessors, (35), 8 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) [2021-05-02 14:52:11,627 WARN L205 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 27 [2021-05-02 14:52:11,912 WARN L205 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 27 [2021-05-02 14:52:12,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:52:12,635 INFO L93 Difference]: Finished difference Result 353 states and 458 transitions. [2021-05-02 14:52:12,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-02 14:52:12,636 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 2.1875) internal successors, (35), 14 states have internal predecessors, (35), 8 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) Word has length 107 [2021-05-02 14:52:12,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:52:12,638 INFO L225 Difference]: With dead ends: 353 [2021-05-02 14:52:12,638 INFO L226 Difference]: Without dead ends: 350 [2021-05-02 14:52:12,638 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 89 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 1544.0ms TimeCoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2021-05-02 14:52:12,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2021-05-02 14:52:12,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 345. [2021-05-02 14:52:12,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 221 states have (on average 1.2217194570135748) internal successors, (270), 231 states have internal predecessors, (270), 91 states have call successors, (91), 33 states have call predecessors, (91), 32 states have return successors, (88), 80 states have call predecessors, (88), 88 states have call successors, (88) [2021-05-02 14:52:12,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 449 transitions. [2021-05-02 14:52:12,671 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 449 transitions. Word has length 107 [2021-05-02 14:52:12,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:52:12,671 INFO L480 AbstractCegarLoop]: Abstraction has 345 states and 449 transitions. [2021-05-02 14:52:12,672 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 17 states, 16 states have (on average 2.1875) internal successors, (35), 14 states have internal predecessors, (35), 8 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 6 states have call predecessors, (17), 7 states have call successors, (17) [2021-05-02 14:52:12,672 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 449 transitions. [2021-05-02 14:52:12,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-05-02 14:52:12,674 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:52:12,674 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:52:12,896 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:12,897 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:52:12,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:52:12,897 INFO L82 PathProgramCache]: Analyzing trace with hash -2134846746, now seen corresponding path program 2 times [2021-05-02 14:52:12,897 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:52:12,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434643133] [2021-05-02 14:52:12,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:52:12,903 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:52:12,904 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [544198473] [2021-05-02 14:52:12,904 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:12,984 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:52:12,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:52:12,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 14:52:12,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:52:13,060 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,061 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,101 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,102 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,163 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,173 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,174 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,186 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,197 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,315 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,332 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,333 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,344 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,356 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,357 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,439 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,601 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,613 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,614 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,625 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,627 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,730 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:13,858 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 47 proven. 52 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2021-05-02 14:52:13,858 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:52:13,858 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434643133] [2021-05-02 14:52:13,859 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:52:13,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544198473] [2021-05-02 14:52:13,859 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544198473] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:52:13,859 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:52:13,859 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 14:52:13,859 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509738595] [2021-05-02 14:52:13,859 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 14:52:13,859 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:52:13,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 14:52:13,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=179, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:52:13,860 INFO L87 Difference]: Start difference. First operand 345 states and 449 transitions. Second operand has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 13 states have internal predecessors, (37), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-02 14:52:15,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:52:15,947 INFO L93 Difference]: Finished difference Result 408 states and 545 transitions. [2021-05-02 14:52:15,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 14:52:15,947 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 13 states have internal predecessors, (37), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) Word has length 109 [2021-05-02 14:52:15,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:52:15,949 INFO L225 Difference]: With dead ends: 408 [2021-05-02 14:52:15,949 INFO L226 Difference]: Without dead ends: 406 [2021-05-02 14:52:15,949 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 1093.6ms TimeCoverageRelationStatistics Valid=111, Invalid=591, Unknown=0, NotChecked=0, Total=702 [2021-05-02 14:52:15,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-05-02 14:52:15,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 367. [2021-05-02 14:52:15,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 233 states have (on average 1.2274678111587982) internal successors, (286), 243 states have internal predecessors, (286), 99 states have call successors, (99), 35 states have call predecessors, (99), 34 states have return successors, (96), 88 states have call predecessors, (96), 96 states have call successors, (96) [2021-05-02 14:52:15,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 481 transitions. [2021-05-02 14:52:15,979 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 481 transitions. Word has length 109 [2021-05-02 14:52:15,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:52:15,980 INFO L480 AbstractCegarLoop]: Abstraction has 367 states and 481 transitions. [2021-05-02 14:52:15,980 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.466666666666667) internal successors, (37), 13 states have internal predecessors, (37), 7 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 6 states have call predecessors, (17), 6 states have call successors, (17) [2021-05-02 14:52:15,980 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 481 transitions. [2021-05-02 14:52:15,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-05-02 14:52:15,981 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:52:15,981 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:52:16,207 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-05-02 14:52:16,207 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:52:16,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:52:16,207 INFO L82 PathProgramCache]: Analyzing trace with hash 1514731471, now seen corresponding path program 2 times [2021-05-02 14:52:16,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:52:16,208 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573108355] [2021-05-02 14:52:16,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:52:16,213 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:52:16,214 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [880033364] [2021-05-02 14:52:16,214 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:16,274 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:52:16,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:52:16,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 14:52:16,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:52:16,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,293 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,341 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,343 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,481 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,546 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:16,583 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 24 proven. 221 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-05-02 14:52:16,583 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:52:16,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573108355] [2021-05-02 14:52:16,584 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:52:16,584 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880033364] [2021-05-02 14:52:16,584 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880033364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:52:16,584 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:52:16,584 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:52:16,584 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612001059] [2021-05-02 14:52:16,584 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:52:16,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:52:16,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:52:16,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:52:16,585 INFO L87 Difference]: Start difference. First operand 367 states and 481 transitions. Second operand has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) [2021-05-02 14:52:16,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:52:16,950 INFO L93 Difference]: Finished difference Result 421 states and 531 transitions. [2021-05-02 14:52:16,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 14:52:16,951 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) Word has length 110 [2021-05-02 14:52:16,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:52:16,953 INFO L225 Difference]: With dead ends: 421 [2021-05-02 14:52:16,954 INFO L226 Difference]: Without dead ends: 414 [2021-05-02 14:52:16,954 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 240.8ms TimeCoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:52:16,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2021-05-02 14:52:16,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 413. [2021-05-02 14:52:16,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 267 states have (on average 1.202247191011236) internal successors, (321), 276 states have internal predecessors, (321), 102 states have call successors, (102), 44 states have call predecessors, (102), 43 states have return successors, (99), 92 states have call predecessors, (99), 99 states have call successors, (99) [2021-05-02 14:52:16,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 522 transitions. [2021-05-02 14:52:16,986 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 522 transitions. Word has length 110 [2021-05-02 14:52:16,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:52:16,986 INFO L480 AbstractCegarLoop]: Abstraction has 413 states and 522 transitions. [2021-05-02 14:52:16,986 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.222222222222222) internal successors, (38), 8 states have internal predecessors, (38), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) [2021-05-02 14:52:16,986 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 522 transitions. [2021-05-02 14:52:16,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2021-05-02 14:52:16,987 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:52:16,987 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:52:17,212 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-05-02 14:52:17,212 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:52:17,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:52:17,213 INFO L82 PathProgramCache]: Analyzing trace with hash -289933735, now seen corresponding path program 3 times [2021-05-02 14:52:17,213 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:52:17,213 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464089396] [2021-05-02 14:52:17,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:52:17,221 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:52:17,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1732593465] [2021-05-02 14:52:17,221 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:17,277 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:52:17,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:52:17,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:52:17,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:52:17,350 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,351 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,391 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,400 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,401 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,429 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,431 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,467 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,488 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,489 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,499 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:17,535 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 44 proven. 11 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2021-05-02 14:52:17,536 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:52:17,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464089396] [2021-05-02 14:52:17,536 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:52:17,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1732593465] [2021-05-02 14:52:17,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1732593465] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:52:17,536 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:52:17,536 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:52:17,536 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674298111] [2021-05-02 14:52:17,537 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:52:17,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:52:17,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:52:17,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:52:17,537 INFO L87 Difference]: Start difference. First operand 413 states and 522 transitions. Second operand has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 7 states have internal predecessors, (33), 4 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-05-02 14:52:18,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:52:18,379 INFO L93 Difference]: Finished difference Result 583 states and 799 transitions. [2021-05-02 14:52:18,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 14:52:18,380 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 7 states have internal predecessors, (33), 4 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 111 [2021-05-02 14:52:18,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:52:18,384 INFO L225 Difference]: With dead ends: 583 [2021-05-02 14:52:18,384 INFO L226 Difference]: Without dead ends: 574 [2021-05-02 14:52:18,385 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 388.9ms TimeCoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2021-05-02 14:52:18,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2021-05-02 14:52:18,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 457. [2021-05-02 14:52:18,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 297 states have (on average 1.2222222222222223) internal successors, (363), 304 states have internal predecessors, (363), 116 states have call successors, (116), 44 states have call predecessors, (116), 43 states have return successors, (113), 108 states have call predecessors, (113), 113 states have call successors, (113) [2021-05-02 14:52:18,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 592 transitions. [2021-05-02 14:52:18,423 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 592 transitions. Word has length 111 [2021-05-02 14:52:18,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:52:18,423 INFO L480 AbstractCegarLoop]: Abstraction has 457 states and 592 transitions. [2021-05-02 14:52:18,423 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.714285714285714) internal successors, (33), 7 states have internal predecessors, (33), 4 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2021-05-02 14:52:18,423 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 592 transitions. [2021-05-02 14:52:18,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-05-02 14:52:18,424 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:52:18,424 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:52:18,644 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-05-02 14:52:18,645 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:52:18,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:52:18,645 INFO L82 PathProgramCache]: Analyzing trace with hash -1282766646, now seen corresponding path program 2 times [2021-05-02 14:52:18,645 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:52:18,645 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093514310] [2021-05-02 14:52:18,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:52:18,650 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:52:18,650 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1737717675] [2021-05-02 14:52:18,651 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:18,726 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:52:18,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:52:18,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 14:52:18,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:52:18,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,811 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,863 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,920 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,921 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,922 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,982 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:18,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,016 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,017 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,056 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 29 proven. 222 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-05-02 14:52:19,056 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:52:19,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093514310] [2021-05-02 14:52:19,056 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:52:19,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1737717675] [2021-05-02 14:52:19,056 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1737717675] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:52:19,056 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:52:19,056 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:52:19,057 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712227572] [2021-05-02 14:52:19,057 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:52:19,057 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:52:19,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:52:19,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:52:19,058 INFO L87 Difference]: Start difference. First operand 457 states and 592 transitions. Second operand has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) [2021-05-02 14:52:19,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:52:19,492 INFO L93 Difference]: Finished difference Result 635 states and 863 transitions. [2021-05-02 14:52:19,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 14:52:19,492 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) Word has length 112 [2021-05-02 14:52:19,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:52:19,495 INFO L225 Difference]: With dead ends: 635 [2021-05-02 14:52:19,495 INFO L226 Difference]: Without dead ends: 459 [2021-05-02 14:52:19,496 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 273.9ms TimeCoverageRelationStatistics Valid=58, Invalid=98, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:52:19,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2021-05-02 14:52:19,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 459. [2021-05-02 14:52:19,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 299 states have (on average 1.2107023411371238) internal successors, (362), 306 states have internal predecessors, (362), 116 states have call successors, (116), 44 states have call predecessors, (116), 43 states have return successors, (113), 108 states have call predecessors, (113), 113 states have call successors, (113) [2021-05-02 14:52:19,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 591 transitions. [2021-05-02 14:52:19,531 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 591 transitions. Word has length 112 [2021-05-02 14:52:19,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:52:19,532 INFO L480 AbstractCegarLoop]: Abstraction has 459 states and 591 transitions. [2021-05-02 14:52:19,532 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.444444444444445) internal successors, (40), 8 states have internal predecessors, (40), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) [2021-05-02 14:52:19,532 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 591 transitions. [2021-05-02 14:52:19,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-05-02 14:52:19,533 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:52:19,533 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:52:19,757 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-05-02 14:52:19,757 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:52:19,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:52:19,758 INFO L82 PathProgramCache]: Analyzing trace with hash 1546024104, now seen corresponding path program 3 times [2021-05-02 14:52:19,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:52:19,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232562329] [2021-05-02 14:52:19,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:52:19,765 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:52:19,765 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [442893371] [2021-05-02 14:52:19,766 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:19,837 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 14:52:19,837 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:52:19,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 14:52:19,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:52:19,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,871 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,872 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,902 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:19,981 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:20,007 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:20,008 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:20,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:20,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:20,066 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:20,067 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:20,124 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:20,125 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:20,126 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:20,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:20,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:20,195 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 32 proven. 229 refuted. 0 times theorem prover too weak. 96 trivial. 0 not checked. [2021-05-02 14:52:20,195 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:52:20,196 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232562329] [2021-05-02 14:52:20,196 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:52:20,196 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442893371] [2021-05-02 14:52:20,196 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442893371] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:52:20,196 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:52:20,196 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:52:20,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [494299579] [2021-05-02 14:52:20,196 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:52:20,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:52:20,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:52:20,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:52:20,197 INFO L87 Difference]: Start difference. First operand 459 states and 591 transitions. Second operand has 10 states, 10 states have (on average 4.4) internal successors, (44), 9 states have internal predecessors, (44), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) [2021-05-02 14:52:20,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:52:20,653 INFO L93 Difference]: Finished difference Result 709 states and 937 transitions. [2021-05-02 14:52:20,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 14:52:20,654 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.4) internal successors, (44), 9 states have internal predecessors, (44), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) Word has length 116 [2021-05-02 14:52:20,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:52:20,656 INFO L225 Difference]: With dead ends: 709 [2021-05-02 14:52:20,656 INFO L226 Difference]: Without dead ends: 533 [2021-05-02 14:52:20,658 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 282.0ms TimeCoverageRelationStatistics Valid=78, Invalid=132, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:52:20,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2021-05-02 14:52:20,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 523. [2021-05-02 14:52:20,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 523 states, 344 states have (on average 1.191860465116279) internal successors, (410), 351 states have internal predecessors, (410), 124 states have call successors, (124), 55 states have call predecessors, (124), 54 states have return successors, (120), 116 states have call predecessors, (120), 120 states have call successors, (120) [2021-05-02 14:52:20,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 523 states to 523 states and 654 transitions. [2021-05-02 14:52:20,699 INFO L78 Accepts]: Start accepts. Automaton has 523 states and 654 transitions. Word has length 116 [2021-05-02 14:52:20,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:52:20,699 INFO L480 AbstractCegarLoop]: Abstraction has 523 states and 654 transitions. [2021-05-02 14:52:20,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 4.4) internal successors, (44), 9 states have internal predecessors, (44), 6 states have call successors, (19), 6 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 5 states have call successors, (17) [2021-05-02 14:52:20,700 INFO L276 IsEmpty]: Start isEmpty. Operand 523 states and 654 transitions. [2021-05-02 14:52:20,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-02 14:52:20,701 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:52:20,701 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:52:20,916 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-02 14:52:20,917 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:52:20,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:52:20,917 INFO L82 PathProgramCache]: Analyzing trace with hash 992936989, now seen corresponding path program 3 times [2021-05-02 14:52:20,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:52:20,918 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741170856] [2021-05-02 14:52:20,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:52:20,924 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:52:20,924 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1899142612] [2021-05-02 14:52:20,924 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 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:21,006 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 14:52:21,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:52:21,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 59 conjunts are in the unsatisfiable core [2021-05-02 14:52:21,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:52:21,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,280 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,324 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,328 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,379 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,403 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,405 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,440 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,455 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,660 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,661 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:21,674 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:23,785 WARN L205 SmtUtils]: Spent 2.07 s on a formula simplification that was a NOOP. DAG size: 20 [2021-05-02 14:52:23,787 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:23,788 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:23,867 INFO L134 CoverageAnalysis]: Checked inductivity of 516 backedges. 106 proven. 32 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-05-02 14:52:23,867 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:52:23,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741170856] [2021-05-02 14:52:23,867 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:52:23,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1899142612] [2021-05-02 14:52:23,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1899142612] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:52:23,867 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:52:23,868 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 14:52:23,868 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247075510] [2021-05-02 14:52:23,868 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 14:52:23,868 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:52:23,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 14:52:23,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:52:23,869 INFO L87 Difference]: Start difference. First operand 523 states and 654 transitions. Second operand has 13 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 14:52:32,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:52:32,879 INFO L93 Difference]: Finished difference Result 586 states and 744 transitions. [2021-05-02 14:52:32,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 14:52:32,879 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) Word has length 124 [2021-05-02 14:52:32,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:52:32,881 INFO L225 Difference]: With dead ends: 586 [2021-05-02 14:52:32,881 INFO L226 Difference]: Without dead ends: 584 [2021-05-02 14:52:32,882 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 111 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 2598.0ms TimeCoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2021-05-02 14:52:32,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2021-05-02 14:52:32,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 560. [2021-05-02 14:52:32,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 560 states, 370 states have (on average 1.2027027027027026) internal successors, (445), 378 states have internal predecessors, (445), 133 states have call successors, (133), 57 states have call predecessors, (133), 56 states have return successors, (129), 124 states have call predecessors, (129), 129 states have call successors, (129) [2021-05-02 14:52:32,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 560 states to 560 states and 707 transitions. [2021-05-02 14:52:32,926 INFO L78 Accepts]: Start accepts. Automaton has 560 states and 707 transitions. Word has length 124 [2021-05-02 14:52:32,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:52:32,927 INFO L480 AbstractCegarLoop]: Abstraction has 560 states and 707 transitions. [2021-05-02 14:52:32,927 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 5 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2021-05-02 14:52:32,927 INFO L276 IsEmpty]: Start isEmpty. Operand 560 states and 707 transitions. [2021-05-02 14:52:32,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-05-02 14:52:32,928 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:52:32,928 INFO L523 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:52:33,148 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:33,149 INFO L428 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:52:33,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:52:33,149 INFO L82 PathProgramCache]: Analyzing trace with hash -1110867224, now seen corresponding path program 4 times [2021-05-02 14:52:33,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:52:33,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710305409] [2021-05-02 14:52:33,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:52:33,155 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:52:33,155 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [434567130] [2021-05-02 14:52:33,155 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:33,236 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 14:52:33,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:52:33,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 87 conjunts are in the unsatisfiable core [2021-05-02 14:52:33,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:52:33,300 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,363 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,364 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,374 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,459 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,460 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,648 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,696 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,697 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,929 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,930 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,943 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,957 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,970 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:33,971 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,406 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 26 [2021-05-02 14:52:34,409 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,410 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,487 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,706 WARN L205 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 26 [2021-05-02 14:52:34,846 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,852 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,870 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:34,888 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:35,032 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 83 proven. 135 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2021-05-02 14:52:35,032 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:52:35,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710305409] [2021-05-02 14:52:35,033 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:52:35,033 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434567130] [2021-05-02 14:52:35,033 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434567130] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:52:35,033 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:52:35,033 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-05-02 14:52:35,033 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195581726] [2021-05-02 14:52:35,033 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 14:52:35,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:52:35,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 14:52:35,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2021-05-02 14:52:35,034 INFO L87 Difference]: Start difference. First operand 560 states and 707 transitions. Second operand has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 15 states have internal predecessors, (41), 9 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 9 states have call predecessors, (19), 9 states have call successors, (19) [2021-05-02 14:52:36,004 WARN L205 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 26 [2021-05-02 14:52:36,978 WARN L205 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 31 [2021-05-02 14:52:37,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:52:37,643 INFO L93 Difference]: Finished difference Result 603 states and 762 transitions. [2021-05-02 14:52:37,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 14:52:37,644 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 15 states have internal predecessors, (41), 9 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 9 states have call predecessors, (19), 9 states have call successors, (19) Word has length 123 [2021-05-02 14:52:37,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:52:37,647 INFO L225 Difference]: With dead ends: 603 [2021-05-02 14:52:37,647 INFO L226 Difference]: Without dead ends: 601 [2021-05-02 14:52:37,648 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 102 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 1990.6ms TimeCoverageRelationStatistics Valid=87, Invalid=513, Unknown=0, NotChecked=0, Total=600 [2021-05-02 14:52:37,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2021-05-02 14:52:37,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 595. [2021-05-02 14:52:37,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 595 states, 389 states have (on average 1.2030848329048842) internal successors, (468), 397 states have internal predecessors, (468), 145 states have call successors, (145), 61 states have call predecessors, (145), 60 states have return successors, (141), 136 states have call predecessors, (141), 141 states have call successors, (141) [2021-05-02 14:52:37,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 595 states to 595 states and 754 transitions. [2021-05-02 14:52:37,699 INFO L78 Accepts]: Start accepts. Automaton has 595 states and 754 transitions. Word has length 123 [2021-05-02 14:52:37,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:52:37,699 INFO L480 AbstractCegarLoop]: Abstraction has 595 states and 754 transitions. [2021-05-02 14:52:37,699 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 15 states have internal predecessors, (41), 9 states have call successors, (21), 2 states have call predecessors, (21), 3 states have return successors, (19), 9 states have call predecessors, (19), 9 states have call successors, (19) [2021-05-02 14:52:37,699 INFO L276 IsEmpty]: Start isEmpty. Operand 595 states and 754 transitions. [2021-05-02 14:52:37,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-02 14:52:37,700 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:52:37,700 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 16, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:52:37,924 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:37,925 INFO L428 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:52:37,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:52:37,925 INFO L82 PathProgramCache]: Analyzing trace with hash -454805304, now seen corresponding path program 4 times [2021-05-02 14:52:37,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:52:37,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285994110] [2021-05-02 14:52:37,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:52:37,931 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:52:37,931 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2129973828] [2021-05-02 14:52:37,931 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:52:38,003 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 14:52:38,003 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:52:38,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 300 conjuncts, 50 conjunts are in the unsatisfiable core [2021-05-02 14:52:38,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:52:38,051 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,113 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,114 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,165 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,166 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,175 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,176 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,184 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,185 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,194 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,251 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,253 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,420 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,435 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,644 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,807 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,809 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,826 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,828 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:38,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:39,074 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:39,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:39,283 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:39,285 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:39,301 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:39,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:39,320 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:39,322 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:39,490 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:39,492 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:52:39,643 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 92 proven. 123 refuted. 0 times theorem prover too weak. 375 trivial. 0 not checked. [2021-05-02 14:52:39,643 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:52:39,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285994110] [2021-05-02 14:52:39,643 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:52:39,643 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129973828] [2021-05-02 14:52:39,643 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2129973828] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:52:39,643 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:52:39,643 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-05-02 14:52:39,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340917389] [2021-05-02 14:52:39,644 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 14:52:39,644 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:52:39,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 14:52:39,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=261, Unknown=0, NotChecked=0, Total=306 [2021-05-02 14:52:39,645 INFO L87 Difference]: Start difference. First operand 595 states and 754 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 13 states have internal predecessors, (36), 10 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (21), 7 states have call predecessors, (21), 9 states have call successors, (21) [2021-05-02 14:52:46,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:52:46,664 INFO L93 Difference]: Finished difference Result 603 states and 762 transitions. [2021-05-02 14:52:46,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 14:52:46,665 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 13 states have internal predecessors, (36), 10 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (21), 7 states have call predecessors, (21), 9 states have call successors, (21) Word has length 128 [2021-05-02 14:52:46,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:52:46,666 INFO L225 Difference]: With dead ends: 603 [2021-05-02 14:52:46,667 INFO L226 Difference]: Without dead ends: 599 [2021-05-02 14:52:46,667 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 1619.8ms TimeCoverageRelationStatistics Valid=97, Invalid=605, Unknown=0, NotChecked=0, Total=702 [2021-05-02 14:52:46,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2021-05-02 14:52:46,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 597. [2021-05-02 14:52:46,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 597 states, 391 states have (on average 1.1994884910485935) internal successors, (469), 398 states have internal predecessors, (469), 145 states have call successors, (145), 62 states have call predecessors, (145), 60 states have return successors, (141), 136 states have call predecessors, (141), 141 states have call successors, (141) [2021-05-02 14:52:46,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 597 states to 597 states and 755 transitions. [2021-05-02 14:52:46,716 INFO L78 Accepts]: Start accepts. Automaton has 597 states and 755 transitions. Word has length 128 [2021-05-02 14:52:46,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:52:46,717 INFO L480 AbstractCegarLoop]: Abstraction has 597 states and 755 transitions. [2021-05-02 14:52:46,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 13 states have internal predecessors, (36), 10 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (21), 7 states have call predecessors, (21), 9 states have call successors, (21) [2021-05-02 14:52:46,717 INFO L276 IsEmpty]: Start isEmpty. Operand 597 states and 755 transitions. [2021-05-02 14:52:46,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-05-02 14:52:46,718 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:52:46,718 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:52:46,928 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-05-02 14:52:46,929 INFO L428 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:52:46,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:52:46,929 INFO L82 PathProgramCache]: Analyzing trace with hash -270396677, now seen corresponding path program 5 times [2021-05-02 14:52:46,929 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:52:46,929 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728230679] [2021-05-02 14:52:46,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:52:46,934 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:52:46,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1104095656] [2021-05-02 14:52:46,935 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true