/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/divbin2_valuebound10.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 14:29:26,249 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 14:29:26,252 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 14:29:26,277 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 14:29:26,285 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 14:29:26,286 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 14:29:26,287 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 14:29:26,288 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 14:29:26,289 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 14:29:26,289 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 14:29:26,291 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 14:29:26,293 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 14:29:26,294 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 14:29:26,296 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 14:29:26,297 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 14:29:26,298 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 14:29:26,300 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 14:29:26,307 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 14:29:26,308 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 14:29:26,309 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 14:29:26,314 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 14:29:26,364 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 14:29:26,364 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 14:29:26,365 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 14:29:26,366 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 14:29:26,366 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 14:29:26,366 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 14:29:26,366 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 14:29:26,366 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 14:29:26,366 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 14:29:26,366 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 14:29:26,367 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 14:29:26,367 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 14:29:26,367 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 14:29:26,367 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 14:29:26,367 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 14:29:26,367 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 14:29:26,367 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 14:29:26,368 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 14:29:26,368 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 14:29:26,368 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 14:29:26,368 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:29:26,368 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 14:29:26,368 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 14:29:26,368 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 14:29:26,369 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 14:29:26,369 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 14:29:26,369 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 14:29:26,369 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 14:29:26,369 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 14:29:26,660 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 14:29:26,680 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 14:29:26,682 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 14:29:26,683 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 14:29:26,684 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 14:29:26,684 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/divbin2_valuebound10.i [2021-05-02 14:29:26,749 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5fccad16d/2232c8daafd8425e87a0bbbce3ec4c62/FLAGb7011f215 [2021-05-02 14:29:27,196 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 14:29:27,196 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/divbin2_valuebound10.i [2021-05-02 14:29:27,202 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5fccad16d/2232c8daafd8425e87a0bbbce3ec4c62/FLAGb7011f215 [2021-05-02 14:29:27,224 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5fccad16d/2232c8daafd8425e87a0bbbce3ec4c62 [2021-05-02 14:29:27,229 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 14:29:27,232 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 14:29:27,234 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 14:29:27,234 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 14:29:27,238 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 14:29:27,238 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:29:27" (1/1) ... [2021-05-02 14:29:27,240 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75a49523 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:29:27, skipping insertion in model container [2021-05-02 14:29:27,240 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:29:27" (1/1) ... [2021-05-02 14:29:27,245 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 14:29:27,258 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 14:29:27,388 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/divbin2_valuebound10.i[959,972] [2021-05-02 14:29:27,399 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:29:27,406 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 14:29:27,445 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/divbin2_valuebound10.i[959,972] [2021-05-02 14:29:27,465 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:29:27,483 INFO L208 MainTranslator]: Completed translation [2021-05-02 14:29:27,484 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:29:27 WrapperNode [2021-05-02 14:29:27,484 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 14:29:27,485 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 14:29:27,485 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 14:29:27,487 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 14:29:27,495 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:29:27" (1/1) ... [2021-05-02 14:29:27,496 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:29:27" (1/1) ... [2021-05-02 14:29:27,501 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:29:27" (1/1) ... [2021-05-02 14:29:27,502 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:29:27" (1/1) ... [2021-05-02 14:29:27,519 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:29:27" (1/1) ... [2021-05-02 14:29:27,523 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:29:27" (1/1) ... [2021-05-02 14:29:27,524 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:29:27" (1/1) ... [2021-05-02 14:29:27,525 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 14:29:27,526 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 14:29:27,526 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 14:29:27,526 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 14:29:27,527 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:29:27" (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 14:29:27,606 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 14:29:27,606 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 14:29:27,606 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 14:29:27,607 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 14:29:27,607 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 14:29:27,607 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 14:29:27,607 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 14:29:27,608 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 14:29:27,608 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-02 14:29:27,608 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-02 14:29:27,608 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 14:29:27,608 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 14:29:27,609 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 14:29:27,609 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 14:29:27,610 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 14:29:27,610 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 14:29:27,610 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 14:29:27,610 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 14:29:27,610 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 14:29:27,610 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 14:29:27,610 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 14:29:27,610 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 14:29:27,945 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 14:29:27,945 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 14:29:27,947 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:29:27 BoogieIcfgContainer [2021-05-02 14:29:27,947 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 14:29:27,948 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 14:29:27,948 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 14:29:27,950 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 14:29:27,950 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 02:29:27" (1/3) ... [2021-05-02 14:29:27,951 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@607536ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:29:27, skipping insertion in model container [2021-05-02 14:29:27,951 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:29:27" (2/3) ... [2021-05-02 14:29:27,951 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@607536ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:29:27, skipping insertion in model container [2021-05-02 14:29:27,951 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:29:27" (3/3) ... [2021-05-02 14:29:27,952 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin2_valuebound10.i [2021-05-02 14:29:27,957 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 14:29:27,960 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 14:29:27,974 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 14:29:27,992 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 14:29:27,992 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 14:29:27,992 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 14:29:27,993 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 14:29:27,993 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 14:29:27,993 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 14:29:27,993 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 14:29:27,993 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 14:29:28,005 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:29:28,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 14:29:28,009 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:28,010 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:29:28,010 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:28,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:28,014 INFO L82 PathProgramCache]: Analyzing trace with hash 1171333446, now seen corresponding path program 1 times [2021-05-02 14:29:28,022 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:28,022 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1101915464] [2021-05-02 14:29:28,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:28,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:29:28,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 14:29:28,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:29:28,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 14:29:28,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:29:28,288 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:29:28,288 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:29:28,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1101915464] [2021-05-02 14:29:28,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1101915464] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:29:28,289 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:29:28,290 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:29:28,290 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260454418] [2021-05-02 14:29:28,294 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:29:28,294 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:29:28,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:29:28,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:29:28,308 INFO L87 Difference]: Start difference. First operand has 30 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 5 states have call successors, (5), 4 states have call predecessors, (5), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:29:28,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:29:28,366 INFO L93 Difference]: Finished difference Result 51 states and 70 transitions. [2021-05-02 14:29:28,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:29:28,367 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 14:29:28,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:29:28,375 INFO L225 Difference]: With dead ends: 51 [2021-05-02 14:29:28,375 INFO L226 Difference]: Without dead ends: 25 [2021-05-02 14:29:28,377 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 67.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:29:28,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-05-02 14:29:28,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2021-05-02 14:29:28,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-02 14:29:28,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2021-05-02 14:29:28,405 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 18 [2021-05-02 14:29:28,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:29:28,405 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2021-05-02 14:29:28,406 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:29:28,406 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2021-05-02 14:29:28,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-02 14:29:28,407 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:28,407 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:29:28,407 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 14:29:28,407 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:28,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:28,408 INFO L82 PathProgramCache]: Analyzing trace with hash -73515422, now seen corresponding path program 1 times [2021-05-02 14:29:28,408 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:28,408 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071439245] [2021-05-02 14:29:28,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:28,424 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:29:28,425 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [805034872] [2021-05-02 14:29:28,425 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 14:29:28,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:29:28,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 14:29:28,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:29:28,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:28,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:28,711 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:29:28,711 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:29:28,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071439245] [2021-05-02 14:29:28,711 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:29:28,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [805034872] [2021-05-02 14:29:28,712 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [805034872] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:29:28,712 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:29:28,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 14:29:28,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476778078] [2021-05-02 14:29:28,713 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:29:28,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:29:28,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:29:28,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:29:28,714 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:29:28,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:29:28,799 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2021-05-02 14:29:28,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:29:28,800 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2021-05-02 14:29:28,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:29:28,801 INFO L225 Difference]: With dead ends: 37 [2021-05-02 14:29:28,801 INFO L226 Difference]: Without dead ends: 34 [2021-05-02 14:29:28,802 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 68.2ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:29:28,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-02 14:29:28,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-05-02 14:29:28,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 24 states have internal predecessors, (28), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:29:28,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2021-05-02 14:29:28,811 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 19 [2021-05-02 14:29:28,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:29:28,811 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2021-05-02 14:29:28,811 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 7 states have internal predecessors, (13), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:29:28,811 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2021-05-02 14:29:28,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-02 14:29:28,812 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:28,812 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:29:29,036 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 14:29:29,036 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:29,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:29,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1211706883, now seen corresponding path program 1 times [2021-05-02 14:29:29,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:29,037 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661917883] [2021-05-02 14:29:29,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:29,049 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:29:29,050 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2032265098] [2021-05-02 14:29:29,050 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 14:29:29,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:29:29,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-02 14:29:29,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:29:29,225 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:29,231 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:29,255 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:29:29,255 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:29:29,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661917883] [2021-05-02 14:29:29,256 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:29:29,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2032265098] [2021-05-02 14:29:29,256 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2032265098] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:29:29,256 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:29:29,256 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:29:29,256 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1141168005] [2021-05-02 14:29:29,257 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:29:29,257 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:29:29,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:29:29,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:29:29,258 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:29:29,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:29:29,371 INFO L93 Difference]: Finished difference Result 45 states and 51 transitions. [2021-05-02 14:29:29,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:29:29,372 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 21 [2021-05-02 14:29:29,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:29:29,373 INFO L225 Difference]: With dead ends: 45 [2021-05-02 14:29:29,373 INFO L226 Difference]: Without dead ends: 42 [2021-05-02 14:29:29,373 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 59.6ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:29:29,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-02 14:29:29,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-05-02 14:29:29,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 29 states have (on average 1.206896551724138) internal successors, (35), 30 states have internal predecessors, (35), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:29:29,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2021-05-02 14:29:29,382 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 21 [2021-05-02 14:29:29,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:29:29,382 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2021-05-02 14:29:29,382 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 7 states have internal predecessors, (15), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 14:29:29,382 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2021-05-02 14:29:29,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-05-02 14:29:29,383 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:29,383 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:29:29,605 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:29:29,606 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:29,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:29,606 INFO L82 PathProgramCache]: Analyzing trace with hash 947727214, now seen corresponding path program 1 times [2021-05-02 14:29:29,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:29,607 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177115691] [2021-05-02 14:29:29,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:29,621 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:29:29,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [827410500] [2021-05-02 14:29:29,622 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 14:29:29,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:29:29,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 14:29:29,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:29:29,775 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:29:29,776 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:29:29,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177115691] [2021-05-02 14:29:29,776 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:29:29,776 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [827410500] [2021-05-02 14:29:29,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [827410500] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:29:29,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:29:29,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:29:29,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696494418] [2021-05-02 14:29:29,777 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:29:29,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:29:29,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:29:29,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:29:29,778 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:29:29,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:29:29,797 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2021-05-02 14:29:29,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:29:29,797 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2021-05-02 14:29:29,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:29:29,798 INFO L225 Difference]: With dead ends: 53 [2021-05-02 14:29:29,798 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 14:29:29,799 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 4.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:29:29,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 14:29:29,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-02 14:29:29,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 25 states have internal predecessors, (29), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-02 14:29:29,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-05-02 14:29:29,804 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 27 [2021-05-02 14:29:29,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:29:29,804 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-05-02 14:29:29,805 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:29:29,805 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-05-02 14:29:29,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-05-02 14:29:29,805 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:29,806 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:29:30,020 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:29:30,021 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:30,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:30,022 INFO L82 PathProgramCache]: Analyzing trace with hash 1574040585, now seen corresponding path program 1 times [2021-05-02 14:29:30,022 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:30,022 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364154158] [2021-05-02 14:29:30,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:30,033 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:29:30,033 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1186779277] [2021-05-02 14:29:30,033 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 14:29:30,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:29:30,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 14:29:30,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:29:30,201 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:30,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:30,243 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:30,248 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:30,277 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:29:30,277 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:29:30,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364154158] [2021-05-02 14:29:30,277 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:29:30,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186779277] [2021-05-02 14:29:30,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1186779277] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:29:30,277 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:29:30,278 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:29:30,278 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795418269] [2021-05-02 14:29:30,278 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:29:30,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:29:30,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:29:30,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:29:30,279 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:29:30,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:29:30,431 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2021-05-02 14:29:30,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:29:30,435 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 29 [2021-05-02 14:29:30,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:29:30,436 INFO L225 Difference]: With dead ends: 58 [2021-05-02 14:29:30,436 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 14:29:30,437 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 74.7ms TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:29:30,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 14:29:30,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-05-02 14:29:30,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 40 states have internal predecessors, (45), 9 states have call successors, (9), 7 states have call predecessors, (9), 6 states have return successors, (7), 6 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 14:29:30,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 61 transitions. [2021-05-02 14:29:30,448 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 61 transitions. Word has length 29 [2021-05-02 14:29:30,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:29:30,449 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 61 transitions. [2021-05-02 14:29:30,449 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:29:30,449 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 61 transitions. [2021-05-02 14:29:30,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-02 14:29:30,450 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:30,450 INFO L523 BasicCegarLoop]: trace histogram [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 14:29:30,673 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:29:30,674 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:30,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:30,675 INFO L82 PathProgramCache]: Analyzing trace with hash -2129198620, now seen corresponding path program 2 times [2021-05-02 14:29:30,675 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:30,675 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513098201] [2021-05-02 14:29:30,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:30,690 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:29:30,690 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1601990006] [2021-05-02 14:29:30,690 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 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 14:29:30,758 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:29:30,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:29:30,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 32 conjunts are in the unsatisfiable core [2021-05-02 14:29:30,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:29:30,765 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:30,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:30,845 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:30,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:30,924 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:30,927 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:30,954 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 14:29:30,955 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:29:30,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513098201] [2021-05-02 14:29:30,955 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:29:30,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1601990006] [2021-05-02 14:29:30,955 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1601990006] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:29:30,955 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:29:30,955 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 14:29:30,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528611469] [2021-05-02 14:29:30,956 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 14:29:30,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:29:30,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 14:29:30,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:29:30,957 INFO L87 Difference]: Start difference. First operand 54 states and 61 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:29:31,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:29:31,219 INFO L93 Difference]: Finished difference Result 85 states and 100 transitions. [2021-05-02 14:29:31,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 14:29:31,220 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 31 [2021-05-02 14:29:31,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:29:31,222 INFO L225 Difference]: With dead ends: 85 [2021-05-02 14:29:31,222 INFO L226 Difference]: Without dead ends: 82 [2021-05-02 14:29:31,223 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 137.9ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-02 14:29:31,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-02 14:29:31,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 54. [2021-05-02 14:29:31,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 39 states have (on average 1.205128205128205) internal successors, (47), 40 states have internal predecessors, (47), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 14:29:31,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 61 transitions. [2021-05-02 14:29:31,231 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 61 transitions. Word has length 31 [2021-05-02 14:29:31,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:29:31,231 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 61 transitions. [2021-05-02 14:29:31,232 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 11 states have internal predecessors, (23), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:29:31,232 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 61 transitions. [2021-05-02 14:29:31,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 14:29:31,232 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:31,233 INFO L523 BasicCegarLoop]: trace histogram [4, 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 14:29:31,448 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 14:29:31,449 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:31,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:31,449 INFO L82 PathProgramCache]: Analyzing trace with hash -414186241, now seen corresponding path program 3 times [2021-05-02 14:29:31,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:31,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434717337] [2021-05-02 14:29:31,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:31,461 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:29:31,461 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1992194969] [2021-05-02 14:29:31,462 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 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 14:29:31,540 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 14:29:31,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:29:31,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 28 conjunts are in the unsatisfiable core [2021-05-02 14:29:31,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:29:31,547 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:31,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:31,619 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:31,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:31,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:31,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:31,728 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:31,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:31,754 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 14:29:31,754 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:29:31,754 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434717337] [2021-05-02 14:29:31,755 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:29:31,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992194969] [2021-05-02 14:29:31,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1992194969] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:29:31,755 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:29:31,755 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 14:29:31,756 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394966779] [2021-05-02 14:29:31,756 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 14:29:31,758 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:29:31,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 14:29:31,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 14:29:31,759 INFO L87 Difference]: Start difference. First operand 54 states and 61 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:29:31,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:29:31,898 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2021-05-02 14:29:31,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 14:29:31,898 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 33 [2021-05-02 14:29:31,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:29:31,900 INFO L225 Difference]: With dead ends: 64 [2021-05-02 14:29:31,900 INFO L226 Difference]: Without dead ends: 61 [2021-05-02 14:29:31,900 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 95.6ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-02 14:29:31,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-05-02 14:29:31,910 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 42. [2021-05-02 14:29:31,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 29 states have (on average 1.1724137931034482) internal successors, (34), 30 states have internal predecessors, (34), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:29:31,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 46 transitions. [2021-05-02 14:29:31,911 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 46 transitions. Word has length 33 [2021-05-02 14:29:31,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:29:31,912 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 46 transitions. [2021-05-02 14:29:31,912 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 9 states have internal predecessors, (20), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 14:29:31,912 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 46 transitions. [2021-05-02 14:29:31,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-05-02 14:29:31,913 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:31,913 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:29:32,118 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:29:32,119 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:32,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:32,119 INFO L82 PathProgramCache]: Analyzing trace with hash -758101483, now seen corresponding path program 4 times [2021-05-02 14:29:32,120 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:32,120 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068515024] [2021-05-02 14:29:32,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:32,129 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:29:32,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [891315701] [2021-05-02 14:29:32,129 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 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 14:29:32,213 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 14:29:32,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:29:32,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 14:29:32,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:29:32,296 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:32,306 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:32,339 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:32,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:32,354 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:32,359 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:32,450 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:32,458 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:32,585 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 9 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 14:29:32,585 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:29:32,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068515024] [2021-05-02 14:29:32,586 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:29:32,586 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891315701] [2021-05-02 14:29:32,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [891315701] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:29:32,586 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:29:32,586 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:29:32,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116392206] [2021-05-02 14:29:32,587 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:29:32,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:29:32,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:29:32,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:29:32,588 INFO L87 Difference]: Start difference. First operand 42 states and 46 transitions. Second operand has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:29:32,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:29:32,730 INFO L93 Difference]: Finished difference Result 77 states and 88 transitions. [2021-05-02 14:29:32,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:29:32,731 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 37 [2021-05-02 14:29:32,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:29:32,732 INFO L225 Difference]: With dead ends: 77 [2021-05-02 14:29:32,732 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 14:29:32,733 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 246.8ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:29:32,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 14:29:32,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 14:29:32,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 31 states have (on average 1.1612903225806452) internal successors, (36), 32 states have internal predecessors, (36), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-02 14:29:32,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2021-05-02 14:29:32,743 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 37 [2021-05-02 14:29:32,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:29:32,744 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2021-05-02 14:29:32,744 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:29:32,744 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2021-05-02 14:29:32,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 14:29:32,746 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:32,746 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:29:32,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:29:32,964 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:32,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:32,965 INFO L82 PathProgramCache]: Analyzing trace with hash 826494192, now seen corresponding path program 5 times [2021-05-02 14:29:32,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:32,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596444991] [2021-05-02 14:29:32,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:32,974 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:29:32,975 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [281182807] [2021-05-02 14:29:32,975 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 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 14:29:33,178 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-02 14:29:33,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:29:33,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 42 conjunts are in the unsatisfiable core [2021-05-02 14:29:33,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:29:33,266 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:33,268 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:33,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:33,370 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:33,449 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:33,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:33,485 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 3 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 14:29:33,485 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:29:33,486 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596444991] [2021-05-02 14:29:33,486 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:29:33,486 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281182807] [2021-05-02 14:29:33,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [281182807] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:29:33,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:29:33,486 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 14:29:33,486 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512936633] [2021-05-02 14:29:33,486 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 14:29:33,487 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:29:33,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 14:29:33,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-05-02 14:29:33,487 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:29:33,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:29:33,727 INFO L93 Difference]: Finished difference Result 100 states and 114 transitions. [2021-05-02 14:29:33,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-02 14:29:33,728 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 39 [2021-05-02 14:29:33,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:29:33,729 INFO L225 Difference]: With dead ends: 100 [2021-05-02 14:29:33,729 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 14:29:33,730 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 198.1ms TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-05-02 14:29:33,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 14:29:33,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 62. [2021-05-02 14:29:33,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 45 states have (on average 1.1555555555555554) internal successors, (52), 46 states have internal predecessors, (52), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 14:29:33,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 68 transitions. [2021-05-02 14:29:33,737 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 68 transitions. Word has length 39 [2021-05-02 14:29:33,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:29:33,737 INFO L480 AbstractCegarLoop]: Abstraction has 62 states and 68 transitions. [2021-05-02 14:29:33,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 13 states have internal predecessors, (29), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:29:33,738 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 68 transitions. [2021-05-02 14:29:33,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 14:29:33,738 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:33,739 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:29:33,949 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 14:29:33,950 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:33,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:33,950 INFO L82 PathProgramCache]: Analyzing trace with hash -1090452213, now seen corresponding path program 6 times [2021-05-02 14:29:33,950 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:33,950 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443934256] [2021-05-02 14:29:33,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:33,970 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:29:33,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1112992363] [2021-05-02 14:29:33,971 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 14:29:37,444 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-02 14:29:37,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:29:37,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 14:29:37,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:29:37,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:37,600 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:37,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:37,749 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:37,861 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:37,864 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:37,906 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:29:37,907 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:29:37,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443934256] [2021-05-02 14:29:37,907 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:29:37,907 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112992363] [2021-05-02 14:29:37,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112992363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:29:37,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:29:37,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 14:29:37,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916197112] [2021-05-02 14:29:37,908 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 14:29:37,908 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:29:37,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 14:29:37,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:29:37,909 INFO L87 Difference]: Start difference. First operand 62 states and 68 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 14 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:29:38,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:29:38,208 INFO L93 Difference]: Finished difference Result 118 states and 134 transitions. [2021-05-02 14:29:38,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 14:29:38,209 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 14 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 41 [2021-05-02 14:29:38,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:29:38,210 INFO L225 Difference]: With dead ends: 118 [2021-05-02 14:29:38,210 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 14:29:38,210 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 329.3ms TimeCoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2021-05-02 14:29:38,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 14:29:38,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 64. [2021-05-02 14:29:38,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 47 states have (on average 1.1702127659574468) internal successors, (55), 48 states have internal predecessors, (55), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 14:29:38,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 71 transitions. [2021-05-02 14:29:38,219 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 71 transitions. Word has length 41 [2021-05-02 14:29:38,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:29:38,219 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 71 transitions. [2021-05-02 14:29:38,219 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 14 states have internal predecessors, (28), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:29:38,219 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 71 transitions. [2021-05-02 14:29:38,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 14:29:38,223 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:38,223 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:29:38,423 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:29:38,424 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:38,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:38,424 INFO L82 PathProgramCache]: Analyzing trace with hash -734977434, now seen corresponding path program 7 times [2021-05-02 14:29:38,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:38,424 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [584386527] [2021-05-02 14:29:38,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:38,433 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:29:38,433 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [816965360] [2021-05-02 14:29:38,433 INFO L93 rtionOrderModulation]: Changing assertion order to 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 14:29:38,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:29:38,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 14:29:38,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:29:38,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:38,723 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:38,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:38,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:38,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:38,801 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:38,813 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 8 proven. 24 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:29:38,813 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:29:38,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [584386527] [2021-05-02 14:29:38,814 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:29:38,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816965360] [2021-05-02 14:29:38,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816965360] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:29:38,814 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:29:38,814 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 14:29:38,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870273636] [2021-05-02 14:29:38,814 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 14:29:38,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:29:38,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 14:29:38,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2021-05-02 14:29:38,816 INFO L87 Difference]: Start difference. First operand 64 states and 71 transitions. Second operand has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:29:39,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:29:39,118 INFO L93 Difference]: Finished difference Result 146 states and 182 transitions. [2021-05-02 14:29:39,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 14:29:39,119 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 43 [2021-05-02 14:29:39,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:29:39,120 INFO L225 Difference]: With dead ends: 146 [2021-05-02 14:29:39,120 INFO L226 Difference]: Without dead ends: 118 [2021-05-02 14:29:39,121 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 216.0ms TimeCoverageRelationStatistics Valid=59, Invalid=321, Unknown=0, NotChecked=0, Total=380 [2021-05-02 14:29:39,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-02 14:29:39,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 72. [2021-05-02 14:29:39,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 53 states have (on average 1.150943396226415) internal successors, (61), 54 states have internal predecessors, (61), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 14:29:39,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 81 transitions. [2021-05-02 14:29:39,129 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 81 transitions. Word has length 43 [2021-05-02 14:29:39,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:29:39,130 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 81 transitions. [2021-05-02 14:29:39,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.5) internal successors, (30), 11 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:29:39,130 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 81 transitions. [2021-05-02 14:29:39,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-05-02 14:29:39,131 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:39,131 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:29:39,344 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:29:39,345 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:39,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:39,345 INFO L82 PathProgramCache]: Analyzing trace with hash -677719132, now seen corresponding path program 1 times [2021-05-02 14:29:39,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:39,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167483959] [2021-05-02 14:29:39,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:39,354 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:29:39,354 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [386505575] [2021-05-02 14:29:39,354 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 14:29:39,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:29:39,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 40 conjunts are in the unsatisfiable core [2021-05-02 14:29:39,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:29:39,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:39,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:39,679 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:39,682 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:39,732 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:39,734 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:39,774 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-02 14:29:39,774 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:29:39,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167483959] [2021-05-02 14:29:39,775 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:29:39,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386505575] [2021-05-02 14:29:39,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386505575] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:29:39,775 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:29:39,775 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2021-05-02 14:29:39,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826166316] [2021-05-02 14:29:39,776 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-02 14:29:39,776 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:29:39,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-02 14:29:39,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-05-02 14:29:39,777 INFO L87 Difference]: Start difference. First operand 72 states and 81 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:29:40,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:29:40,047 INFO L93 Difference]: Finished difference Result 110 states and 122 transitions. [2021-05-02 14:29:40,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-02 14:29:40,048 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 43 [2021-05-02 14:29:40,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:29:40,049 INFO L225 Difference]: With dead ends: 110 [2021-05-02 14:29:40,049 INFO L226 Difference]: Without dead ends: 83 [2021-05-02 14:29:40,050 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 186.2ms TimeCoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2021-05-02 14:29:40,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2021-05-02 14:29:40,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 72. [2021-05-02 14:29:40,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 53 states have (on average 1.1132075471698113) internal successors, (59), 54 states have internal predecessors, (59), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:29:40,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2021-05-02 14:29:40,057 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 43 [2021-05-02 14:29:40,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:29:40,057 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2021-05-02 14:29:40,057 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 13 states have internal predecessors, (30), 4 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 14:29:40,057 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2021-05-02 14:29:40,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-05-02 14:29:40,058 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:40,058 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:29:40,261 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-05-02 14:29:40,262 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:40,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:40,262 INFO L82 PathProgramCache]: Analyzing trace with hash -181810180, now seen corresponding path program 8 times [2021-05-02 14:29:40,262 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:40,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075284973] [2021-05-02 14:29:40,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:40,268 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:29:40,268 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [380278157] [2021-05-02 14:29:40,268 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 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 14:29:40,408 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:29:40,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:29:40,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 14:29:40,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:29:40,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:40,480 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:40,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:40,514 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:40,543 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:40,545 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:29:40,563 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 14 proven. 16 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 14:29:40,563 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:29:40,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075284973] [2021-05-02 14:29:40,563 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:29:40,564 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380278157] [2021-05-02 14:29:40,564 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380278157] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:29:40,564 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:29:40,564 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 14:29:40,564 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579740348] [2021-05-02 14:29:40,564 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 14:29:40,564 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:29:40,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 14:29:40,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:29:40,565 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:29:40,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:29:40,623 INFO L93 Difference]: Finished difference Result 94 states and 105 transitions. [2021-05-02 14:29:40,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 14:29:40,623 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) Word has length 47 [2021-05-02 14:29:40,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:29:40,625 INFO L225 Difference]: With dead ends: 94 [2021-05-02 14:29:40,625 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 14:29:40,628 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 53.5ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:29:40,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 14:29:40,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2021-05-02 14:29:40,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 54 states have internal predecessors, (58), 10 states have call successors, (10), 9 states have call predecessors, (10), 8 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:29:40,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 76 transitions. [2021-05-02 14:29:40,636 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 76 transitions. Word has length 47 [2021-05-02 14:29:40,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:29:40,636 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 76 transitions. [2021-05-02 14:29:40,636 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.142857142857143) internal successors, (29), 7 states have internal predecessors, (29), 5 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:29:40,636 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 76 transitions. [2021-05-02 14:29:40,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 14:29:40,637 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:29:40,637 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:29:40,859 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 14:29:40,860 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:29:40,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:29:40,860 INFO L82 PathProgramCache]: Analyzing trace with hash 1223112983, now seen corresponding path program 9 times [2021-05-02 14:29:40,860 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:29:40,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789577027] [2021-05-02 14:29:40,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:29:40,868 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:29:40,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [729965686] [2021-05-02 14:29:40,869 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 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 14:35:49,100 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-02 14:35:49,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:35:49,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 56 conjunts are in the unsatisfiable core [2021-05-02 14:35:49,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:35:49,334 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:49,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:49,434 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:49,437 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:49,608 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:49,612 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:49,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:49,831 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:49,877 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 14:35:49,877 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:35:49,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789577027] [2021-05-02 14:35:49,877 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:35:49,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [729965686] [2021-05-02 14:35:49,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [729965686] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:35:49,877 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:35:49,877 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2021-05-02 14:35:49,877 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146427348] [2021-05-02 14:35:49,878 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-02 14:35:49,878 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:35:49,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-02 14:35:49,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2021-05-02 14:35:49,879 INFO L87 Difference]: Start difference. First operand 72 states and 76 transitions. Second operand has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:35:50,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:35:50,357 INFO L93 Difference]: Finished difference Result 97 states and 106 transitions. [2021-05-02 14:35:50,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-02 14:35:50,358 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 49 [2021-05-02 14:35:50,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:35:50,358 INFO L225 Difference]: With dead ends: 97 [2021-05-02 14:35:50,358 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 14:35:50,359 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 537.8ms TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2021-05-02 14:35:50,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 14:35:50,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 82. [2021-05-02 14:35:50,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 60 states have (on average 1.1) internal successors, (66), 62 states have internal predecessors, (66), 12 states have call successors, (12), 10 states have call predecessors, (12), 9 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 14:35:50,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 88 transitions. [2021-05-02 14:35:50,366 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 88 transitions. Word has length 49 [2021-05-02 14:35:50,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:35:50,367 INFO L480 AbstractCegarLoop]: Abstraction has 82 states and 88 transitions. [2021-05-02 14:35:50,367 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.7222222222222223) internal successors, (31), 16 states have internal predecessors, (31), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:35:50,367 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 88 transitions. [2021-05-02 14:35:50,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-05-02 14:35:50,367 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:35:50,368 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:35:50,587 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 14:35:50,587 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:35:50,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:35:50,587 INFO L82 PathProgramCache]: Analyzing trace with hash 211995733, now seen corresponding path program 2 times [2021-05-02 14:35:50,587 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:35:50,588 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [780112387] [2021-05-02 14:35:50,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:35:50,600 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:35:50,600 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [628148085] [2021-05-02 14:35:50,600 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 14:35:50,876 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 14:35:50,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:35:50,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 14:35:50,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:35:51,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:51,015 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:51,117 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:51,119 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:51,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:51,224 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:51,303 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:51,305 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:35:51,343 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 5 proven. 37 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-05-02 14:35:51,343 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:35:51,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [780112387] [2021-05-02 14:35:51,343 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:35:51,343 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [628148085] [2021-05-02 14:35:51,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [628148085] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:35:51,344 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:35:51,344 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2021-05-02 14:35:51,344 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86211795] [2021-05-02 14:35:51,344 INFO L460 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-05-02 14:35:51,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:35:51,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-05-02 14:35:51,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2021-05-02 14:35:51,345 INFO L87 Difference]: Start difference. First operand 82 states and 88 transitions. Second operand has 20 states, 20 states have (on average 1.7) internal successors, (34), 18 states have internal predecessors, (34), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:35:51,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:35:51,679 INFO L93 Difference]: Finished difference Result 102 states and 111 transitions. [2021-05-02 14:35:51,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-02 14:35:51,680 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 18 states have internal predecessors, (34), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 49 [2021-05-02 14:35:51,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:35:51,680 INFO L225 Difference]: With dead ends: 102 [2021-05-02 14:35:51,680 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 14:35:51,681 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 29 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 360.8ms TimeCoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2021-05-02 14:35:51,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 14:35:51,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 80. [2021-05-02 14:35:51,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 59 states have (on average 1.1016949152542372) internal successors, (65), 60 states have internal predecessors, (65), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 14:35:51,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 85 transitions. [2021-05-02 14:35:51,687 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 85 transitions. Word has length 49 [2021-05-02 14:35:51,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:35:51,688 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 85 transitions. [2021-05-02 14:35:51,688 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 18 states have internal predecessors, (34), 5 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:35:51,688 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 85 transitions. [2021-05-02 14:35:51,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 14:35:51,688 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:35:51,688 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:35:51,892 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:35:51,892 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:35:51,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:35:51,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1723424432, now seen corresponding path program 3 times [2021-05-02 14:35:51,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:35:51,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382514677] [2021-05-02 14:35:51,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:35:51,901 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:35:51,901 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [579683792] [2021-05-02 14:35:51,901 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 14:36:14,239 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-05-02 14:36:14,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:36:14,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 54 conjunts are in the unsatisfiable core [2021-05-02 14:36:14,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:14,471 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:14,474 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:14,551 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:14,553 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:14,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:14,636 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:14,745 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:14,751 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:14,786 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 6 proven. 38 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 14:36:14,786 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:14,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382514677] [2021-05-02 14:36:14,786 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:14,786 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579683792] [2021-05-02 14:36:14,786 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [579683792] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:14,786 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:14,786 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 14:36:14,786 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256003409] [2021-05-02 14:36:14,787 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 14:36:14,787 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:14,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 14:36:14,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=202, Unknown=0, NotChecked=0, Total=240 [2021-05-02 14:36:14,787 INFO L87 Difference]: Start difference. First operand 80 states and 85 transitions. Second operand has 16 states, 16 states have (on average 2.0625) internal successors, (33), 14 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:36:15,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:15,070 INFO L93 Difference]: Finished difference Result 102 states and 111 transitions. [2021-05-02 14:36:15,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 14:36:15,071 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 14 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) Word has length 51 [2021-05-02 14:36:15,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:15,072 INFO L225 Difference]: With dead ends: 102 [2021-05-02 14:36:15,072 INFO L226 Difference]: Without dead ends: 98 [2021-05-02 14:36:15,072 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 315.7ms TimeCoverageRelationStatistics Valid=46, Invalid=260, Unknown=0, NotChecked=0, Total=306 [2021-05-02 14:36:15,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-02 14:36:15,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 80. [2021-05-02 14:36:15,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 59 states have (on average 1.1016949152542372) internal successors, (65), 60 states have internal predecessors, (65), 11 states have call successors, (11), 10 states have call predecessors, (11), 9 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 14:36:15,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 85 transitions. [2021-05-02 14:36:15,079 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 85 transitions. Word has length 51 [2021-05-02 14:36:15,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:15,079 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 85 transitions. [2021-05-02 14:36:15,079 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 14 states have internal predecessors, (33), 5 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-05-02 14:36:15,080 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 85 transitions. [2021-05-02 14:36:15,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-05-02 14:36:15,080 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:15,080 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:36:15,291 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 14:36:15,291 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:15,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:15,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1720623395, now seen corresponding path program 10 times [2021-05-02 14:36:15,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:15,292 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974546253] [2021-05-02 14:36:15,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:15,304 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:15,304 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1681386459] [2021-05-02 14:36:15,304 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 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 14:36:15,483 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 14:36:15,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:36:15,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 24 conjunts are in the unsatisfiable core [2021-05-02 14:36:15,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:15,588 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:15,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:15,623 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:15,626 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:15,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:15,722 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:15,741 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:15,743 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:15,760 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 19 proven. 33 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 14:36:15,760 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:15,760 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974546253] [2021-05-02 14:36:15,761 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:15,761 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1681386459] [2021-05-02 14:36:15,761 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1681386459] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:15,761 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:15,761 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:36:15,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551233905] [2021-05-02 14:36:15,763 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:36:15,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:15,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:36:15,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:36:15,764 INFO L87 Difference]: Start difference. First operand 80 states and 85 transitions. Second operand has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 14:36:15,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:15,857 INFO L93 Difference]: Finished difference Result 98 states and 108 transitions. [2021-05-02 14:36:15,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:36:15,857 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 57 [2021-05-02 14:36:15,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:15,858 INFO L225 Difference]: With dead ends: 98 [2021-05-02 14:36:15,858 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 14:36:15,859 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 142.5ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:36:15,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 14:36:15,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-05-02 14:36:15,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 48 states have internal predecessors, (51), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 14:36:15,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2021-05-02 14:36:15,866 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 57 [2021-05-02 14:36:15,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:15,866 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2021-05-02 14:36:15,866 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.4) internal successors, (34), 10 states have internal predecessors, (34), 6 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 14:36:15,867 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2021-05-02 14:36:15,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 14:36:15,867 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:15,867 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:36:16,070 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 14:36:16,071 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:16,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:16,071 INFO L82 PathProgramCache]: Analyzing trace with hash 324148668, now seen corresponding path program 4 times [2021-05-02 14:36:16,071 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:16,071 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799322579] [2021-05-02 14:36:16,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:16,077 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:16,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1789237302] [2021-05-02 14:36:16,078 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 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 14:36:16,414 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 14:36:16,414 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:36:16,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 39 conjunts are in the unsatisfiable core [2021-05-02 14:36:16,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:36:16,563 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:16,574 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:16,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:16,647 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:16,757 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:16,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:16,999 WARN L205 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2021-05-02 14:36:17,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:17,200 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:17,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:17,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:36:17,274 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 16 proven. 44 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 14:36:17,274 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:36:17,274 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799322579] [2021-05-02 14:36:17,274 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:36:17,274 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789237302] [2021-05-02 14:36:17,274 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1789237302] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:36:17,274 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:36:17,275 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2021-05-02 14:36:17,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281141769] [2021-05-02 14:36:17,276 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-02 14:36:17,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:36:17,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-02 14:36:17,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=205, Unknown=0, NotChecked=0, Total=240 [2021-05-02 14:36:17,277 INFO L87 Difference]: Start difference. First operand 64 states and 67 transitions. Second operand has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 14:36:18,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:36:18,113 INFO L93 Difference]: Finished difference Result 83 states and 92 transitions. [2021-05-02 14:36:18,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-02 14:36:18,114 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 59 [2021-05-02 14:36:18,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:36:18,115 INFO L225 Difference]: With dead ends: 83 [2021-05-02 14:36:18,115 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 14:36:18,116 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 1022.5ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-02 14:36:18,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 14:36:18,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 68. [2021-05-02 14:36:18,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 50 states have (on average 1.06) internal successors, (53), 51 states have internal predecessors, (53), 10 states have call successors, (10), 8 states have call predecessors, (10), 7 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 14:36:18,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 71 transitions. [2021-05-02 14:36:18,122 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 71 transitions. Word has length 59 [2021-05-02 14:36:18,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:36:18,122 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 71 transitions. [2021-05-02 14:36:18,122 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.25) internal successors, (36), 15 states have internal predecessors, (36), 6 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 14:36:18,122 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 71 transitions. [2021-05-02 14:36:18,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 14:36:18,123 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:36:18,123 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:36:18,326 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 14:36:18,326 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:36:18,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:36:18,327 INFO L82 PathProgramCache]: Analyzing trace with hash 381406970, now seen corresponding path program 5 times [2021-05-02 14:36:18,327 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:36:18,327 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905940395] [2021-05-02 14:36:18,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:36:18,334 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:36:18,334 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1297935511] [2021-05-02 14:36:18,334 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 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 14:37:05,367 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 14:37:05,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 14:37:05,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 63 conjunts are in the unsatisfiable core [2021-05-02 14:37:05,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:37:05,560 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:05,578 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:05,645 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:05,646 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:05,776 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:05,777 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:05,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:05,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:06,037 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:06,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:37:06,095 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 10 proven. 59 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 14:37:06,095 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:37:06,095 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905940395] [2021-05-02 14:37:06,095 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:37:06,095 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297935511] [2021-05-02 14:37:06,095 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297935511] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:37:06,095 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:37:06,096 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2021-05-02 14:37:06,096 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538421525] [2021-05-02 14:37:06,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-02 14:37:06,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:37:06,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-02 14:37:06,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=296, Unknown=0, NotChecked=0, Total=342 [2021-05-02 14:37:06,097 INFO L87 Difference]: Start difference. First operand 68 states and 71 transitions. Second operand has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 17 states have internal predecessors, (39), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 14:37:06,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:37:06,587 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2021-05-02 14:37:06,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-02 14:37:06,588 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 17 states have internal predecessors, (39), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 59 [2021-05-02 14:37:06,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:37:06,589 INFO L225 Difference]: With dead ends: 78 [2021-05-02 14:37:06,589 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 14:37:06,590 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 36 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 526.7ms TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2021-05-02 14:37:06,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 14:37:06,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-05-02 14:37:06,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 47 states have (on average 1.0425531914893618) internal successors, (49), 48 states have internal predecessors, (49), 9 states have call successors, (9), 8 states have call predecessors, (9), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 14:37:06,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2021-05-02 14:37:06,605 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 59 [2021-05-02 14:37:06,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:37:06,605 INFO L480 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2021-05-02 14:37:06,605 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 17 states have internal predecessors, (39), 6 states have call successors, (8), 2 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2021-05-02 14:37:06,605 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2021-05-02 14:37:06,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 14:37:06,608 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:37:06,609 INFO L523 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 14:37:06,809 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:37:06,809 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:37:06,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:37:06,809 INFO L82 PathProgramCache]: Analyzing trace with hash -686968582, now seen corresponding path program 6 times [2021-05-02 14:37:06,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:37:06,810 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2022968060] [2021-05-02 14:37:06,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:37:06,815 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:37:06,815 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [981602538] [2021-05-02 14:37:06,815 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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