/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/hard-ll_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 15:25:34,989 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 15:25:34,992 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 15:25:35,031 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 15:25:35,051 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 15:25:35,053 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 15:25:35,054 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 15:25:35,055 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 15:25:35,057 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 15:25:35,058 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 15:25:35,060 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 15:25:35,065 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 15:25:35,066 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 15:25:35,067 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 15:25:35,068 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 15:25:35,070 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 15:25:35,076 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 15:25:35,085 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 15:25:35,085 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 15:25:35,086 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 15:25:35,090 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-05-02 15:25:35,126 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 15:25:35,127 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 15:25:35,129 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 15:25:35,130 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 15:25:35,130 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 15:25:35,130 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 15:25:35,130 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 15:25:35,130 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 15:25:35,131 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 15:25:35,131 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 15:25:35,132 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 15:25:35,132 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 15:25:35,132 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 15:25:35,132 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 15:25:35,132 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 15:25:35,132 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 15:25:35,133 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 15:25:35,133 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 15:25:35,133 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 15:25:35,133 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 15:25:35,133 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 15:25:35,134 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 15:25:35,134 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 15:25:35,134 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 15:25:35,134 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 15:25:35,134 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 15:25:35,134 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 15:25:35,135 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 15:25:35,135 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 15:25:35,494 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 15:25:35,511 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 15:25:35,513 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 15:25:35,514 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 15:25:35,515 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 15:25:35,515 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/hard-ll_unwindbound20.c [2021-05-02 15:25:35,587 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be4c4fab7/e1570ebe85734a5eba8cd96f74117b91/FLAGb08f9c1ee [2021-05-02 15:25:36,049 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 15:25:36,049 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/hard-ll_unwindbound20.c [2021-05-02 15:25:36,054 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be4c4fab7/e1570ebe85734a5eba8cd96f74117b91/FLAGb08f9c1ee [2021-05-02 15:25:36,427 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/be4c4fab7/e1570ebe85734a5eba8cd96f74117b91 [2021-05-02 15:25:36,431 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 15:25:36,433 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 15:25:36,437 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 15:25:36,437 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 15:25:36,440 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 15:25:36,441 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:25:36" (1/1) ... [2021-05-02 15:25:36,442 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6801db2f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:25:36, skipping insertion in model container [2021-05-02 15:25:36,442 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 03:25:36" (1/1) ... [2021-05-02 15:25:36,449 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 15:25:36,463 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 15:25:36,582 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/hard-ll_unwindbound20.c[546,559] [2021-05-02 15:25:36,596 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:25:36,603 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 15:25:36,613 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/hard-ll_unwindbound20.c[546,559] [2021-05-02 15:25:36,619 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 15:25:36,630 INFO L208 MainTranslator]: Completed translation [2021-05-02 15:25:36,631 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:25:36 WrapperNode [2021-05-02 15:25:36,631 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 15:25:36,632 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 15:25:36,632 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 15:25:36,632 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 15:25:36,675 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:25:36" (1/1) ... [2021-05-02 15:25:36,676 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:25:36" (1/1) ... [2021-05-02 15:25:36,688 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:25:36" (1/1) ... [2021-05-02 15:25:36,688 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:25:36" (1/1) ... [2021-05-02 15:25:36,696 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:25:36" (1/1) ... [2021-05-02 15:25:36,700 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:25:36" (1/1) ... [2021-05-02 15:25:36,701 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:25:36" (1/1) ... [2021-05-02 15:25:36,703 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 15:25:36,704 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 15:25:36,704 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 15:25:36,704 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 15:25:36,705 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:25:36" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 15:25:36,773 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 15:25:36,774 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 15:25:36,774 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 15:25:36,774 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 15:25:36,774 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 15:25:36,774 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 15:25:36,774 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 15:25:36,774 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 15:25:36,775 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 15:25:36,775 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 15:25:36,775 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 15:25:36,775 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 15:25:36,776 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 15:25:36,776 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 15:25:36,778 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 15:25:36,778 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 15:25:36,778 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 15:25:36,778 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 15:25:36,778 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 15:25:36,778 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 15:25:37,130 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 15:25:37,130 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 15:25:37,131 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:25:37 BoogieIcfgContainer [2021-05-02 15:25:37,131 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 15:25:37,133 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 15:25:37,133 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 15:25:37,135 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 15:25:37,135 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 03:25:36" (1/3) ... [2021-05-02 15:25:37,136 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@143b36d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:25:37, skipping insertion in model container [2021-05-02 15:25:37,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 03:25:36" (2/3) ... [2021-05-02 15:25:37,137 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@143b36d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 03:25:37, skipping insertion in model container [2021-05-02 15:25:37,137 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 03:25:37" (3/3) ... [2021-05-02 15:25:37,138 INFO L111 eAbstractionObserver]: Analyzing ICFG hard-ll_unwindbound20.c [2021-05-02 15:25:37,142 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 15:25:37,147 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 15:25:37,162 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 15:25:37,194 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 15:25:37,195 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 15:25:37,195 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 15:25:37,195 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 15:25:37,195 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 15:25:37,195 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 15:25:37,195 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 15:25:37,195 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 15:25:37,214 INFO L276 IsEmpty]: Start isEmpty. Operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 15:25:37,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 15:25:37,218 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:37,219 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 15:25:37,219 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:37,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:37,224 INFO L82 PathProgramCache]: Analyzing trace with hash 1191571617, now seen corresponding path program 1 times [2021-05-02 15:25:37,231 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:37,231 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377809126] [2021-05-02 15:25:37,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:37,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:37,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:25:37,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:37,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:25:37,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:37,482 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 15:25:37,482 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:37,483 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377809126] [2021-05-02 15:25:37,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1377809126] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:25:37,483 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:25:37,484 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 15:25:37,484 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831356298] [2021-05-02 15:25:37,487 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 15:25:37,487 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:37,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 15:25:37,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 15:25:37,497 INFO L87 Difference]: Start difference. First operand has 37 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 22 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) 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 15:25:37,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:37,606 INFO L93 Difference]: Finished difference Result 66 states and 101 transitions. [2021-05-02 15:25:37,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 15:25:37,607 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 15:25:37,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:37,614 INFO L225 Difference]: With dead ends: 66 [2021-05-02 15:25:37,615 INFO L226 Difference]: Without dead ends: 33 [2021-05-02 15:25:37,617 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 76.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 15:25:37,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-05-02 15:25:37,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-05-02 15:25:37,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 19 states have internal predecessors, (24), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:25:37,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions. [2021-05-02 15:25:37,664 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 18 [2021-05-02 15:25:37,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:37,665 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 42 transitions. [2021-05-02 15:25:37,665 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 15:25:37,665 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions. [2021-05-02 15:25:37,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-02 15:25:37,666 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:37,666 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 15:25:37,666 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 15:25:37,666 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:37,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:37,667 INFO L82 PathProgramCache]: Analyzing trace with hash 336486197, now seen corresponding path program 1 times [2021-05-02 15:25:37,667 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:37,667 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434627583] [2021-05-02 15:25:37,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:37,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:37,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:25:37,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:37,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:25:37,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:37,788 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 15:25:37,788 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:37,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434627583] [2021-05-02 15:25:37,789 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1434627583] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:25:37,789 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:25:37,789 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 15:25:37,789 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094772246] [2021-05-02 15:25:37,790 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:25:37,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:37,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:25:37,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:25:37,791 INFO L87 Difference]: Start difference. First operand 32 states and 42 transitions. Second operand has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:25:38,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:38,038 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2021-05-02 15:25:38,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:25:38,038 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-02 15:25:38,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:38,039 INFO L225 Difference]: With dead ends: 47 [2021-05-02 15:25:38,039 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 15:25:38,040 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 128.1ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:25:38,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 15:25:38,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 36. [2021-05-02 15:25:38,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 22 states have internal predecessors, (27), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:25:38,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2021-05-02 15:25:38,051 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 18 [2021-05-02 15:25:38,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:38,051 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2021-05-02 15:25:38,052 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.0) internal successors, (12), 4 states have internal predecessors, (12), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-02 15:25:38,052 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2021-05-02 15:25:38,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-02 15:25:38,052 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:38,053 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:38,053 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 15:25:38,053 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:38,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:38,053 INFO L82 PathProgramCache]: Analyzing trace with hash -1819267188, now seen corresponding path program 1 times [2021-05-02 15:25:38,054 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:38,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622821443] [2021-05-02 15:25:38,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:38,067 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:38,067 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1300563456] [2021-05-02 15:25:38,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:38,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:38,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 15:25:38,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:38,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:38,182 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:38,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:38,220 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:38,223 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:38,240 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 15:25:38,240 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:38,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622821443] [2021-05-02 15:25:38,241 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:38,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300563456] [2021-05-02 15:25:38,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300563456] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:25:38,241 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:25:38,241 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 15:25:38,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676299880] [2021-05-02 15:25:38,242 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 15:25:38,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:38,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 15:25:38,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:25:38,243 INFO L87 Difference]: Start difference. First operand 36 states and 45 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 15:25:38,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:38,255 INFO L93 Difference]: Finished difference Result 52 states and 67 transitions. [2021-05-02 15:25:38,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 15:25:38,256 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2021-05-02 15:25:38,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:38,257 INFO L225 Difference]: With dead ends: 52 [2021-05-02 15:25:38,257 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 15:25:38,257 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.3ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 15:25:38,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 15:25:38,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 15:25:38,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 24 states have internal predecessors, (29), 10 states have call successors, (10), 5 states have call predecessors, (10), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:25:38,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 47 transitions. [2021-05-02 15:25:38,264 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 47 transitions. Word has length 20 [2021-05-02 15:25:38,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:38,264 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 47 transitions. [2021-05-02 15:25:38,265 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-02 15:25:38,265 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 47 transitions. [2021-05-02 15:25:38,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-02 15:25:38,265 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:38,265 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, 1, 1] [2021-05-02 15:25:38,466 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 15:25:38,466 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:38,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:38,467 INFO L82 PathProgramCache]: Analyzing trace with hash -784889968, now seen corresponding path program 1 times [2021-05-02 15:25:38,467 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:38,467 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501025185] [2021-05-02 15:25:38,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:38,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:38,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 15:25:38,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:38,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 15:25:38,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:38,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2021-05-02 15:25:38,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:38,592 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 15:25:38,592 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:38,592 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501025185] [2021-05-02 15:25:38,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501025185] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:25:38,592 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:25:38,593 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 15:25:38,593 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202503272] [2021-05-02 15:25:38,593 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:25:38,593 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:38,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:25:38,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:25:38,594 INFO L87 Difference]: Start difference. First operand 38 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 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 15:25:38,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:38,852 INFO L93 Difference]: Finished difference Result 52 states and 66 transitions. [2021-05-02 15:25:38,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:25:38,852 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 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 23 [2021-05-02 15:25:38,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:38,855 INFO L225 Difference]: With dead ends: 52 [2021-05-02 15:25:38,855 INFO L226 Difference]: Without dead ends: 50 [2021-05-02 15:25:38,857 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 143.9ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:25:38,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-02 15:25:38,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 42. [2021-05-02 15:25:38,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 27 states have internal predecessors, (32), 10 states have call successors, (10), 6 states have call predecessors, (10), 5 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 15:25:38,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-05-02 15:25:38,879 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 23 [2021-05-02 15:25:38,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:38,880 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-05-02 15:25:38,880 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.5) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (5), 3 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 15:25:38,881 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-05-02 15:25:38,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-05-02 15:25:38,882 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:38,883 INFO L523 BasicCegarLoop]: trace histogram [3, 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 15:25:38,883 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-02 15:25:38,883 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:38,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:38,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1024624683, now seen corresponding path program 1 times [2021-05-02 15:25:38,884 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:38,884 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1729942702] [2021-05-02 15:25:38,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:38,903 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:38,903 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2145323418] [2021-05-02 15:25:38,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:38,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:38,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 15:25:38,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:39,164 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-02 15:25:39,165 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:39,165 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1729942702] [2021-05-02 15:25:39,165 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:39,165 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2145323418] [2021-05-02 15:25:39,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2145323418] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:25:39,166 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:25:39,166 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 15:25:39,166 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1628667938] [2021-05-02 15:25:39,168 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 15:25:39,168 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:39,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 15:25:39,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:25:39,170 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:25:39,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:39,333 INFO L93 Difference]: Finished difference Result 75 states and 96 transitions. [2021-05-02 15:25:39,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 15:25:39,334 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 28 [2021-05-02 15:25:39,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:39,335 INFO L225 Difference]: With dead ends: 75 [2021-05-02 15:25:39,335 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 15:25:39,336 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 74.1ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:25:39,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 15:25:39,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-02 15:25:39,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 36 states have (on average 1.2222222222222223) internal successors, (44), 38 states have internal predecessors, (44), 16 states have call successors, (16), 8 states have call predecessors, (16), 7 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 15:25:39,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 73 transitions. [2021-05-02 15:25:39,345 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 73 transitions. Word has length 28 [2021-05-02 15:25:39,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:39,345 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 73 transitions. [2021-05-02 15:25:39,345 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 3 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-02 15:25:39,345 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 73 transitions. [2021-05-02 15:25:39,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 15:25:39,346 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:39,346 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:39,568 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:39,568 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:39,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:39,569 INFO L82 PathProgramCache]: Analyzing trace with hash 1301357193, now seen corresponding path program 1 times [2021-05-02 15:25:39,569 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:39,569 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [491123875] [2021-05-02 15:25:39,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:39,583 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:39,583 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1651329122] [2021-05-02 15:25:39,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:39,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:39,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 15:25:39,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:39,664 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:39,670 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:39,673 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:39,706 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:39,710 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:39,712 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:39,758 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:39,760 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:39,772 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 15:25:39,772 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:39,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [491123875] [2021-05-02 15:25:39,772 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:39,772 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651329122] [2021-05-02 15:25:39,773 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651329122] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:25:39,773 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:25:39,773 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 15:25:39,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194802637] [2021-05-02 15:25:39,773 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 15:25:39,773 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:39,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 15:25:39,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:25:39,774 INFO L87 Difference]: Start difference. First operand 60 states and 73 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:25:39,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:39,807 INFO L93 Difference]: Finished difference Result 76 states and 86 transitions. [2021-05-02 15:25:39,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 15:25:39,807 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 36 [2021-05-02 15:25:39,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:39,808 INFO L225 Difference]: With dead ends: 76 [2021-05-02 15:25:39,808 INFO L226 Difference]: Without dead ends: 69 [2021-05-02 15:25:39,809 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 9.3ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:25:39,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-05-02 15:25:39,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2021-05-02 15:25:39,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 42 states have (on average 1.1666666666666667) internal successors, (49), 44 states have internal predecessors, (49), 16 states have call successors, (16), 10 states have call predecessors, (16), 9 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 15:25:39,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 78 transitions. [2021-05-02 15:25:39,817 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 78 transitions. Word has length 36 [2021-05-02 15:25:39,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:39,817 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 78 transitions. [2021-05-02 15:25:39,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:25:39,818 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 78 transitions. [2021-05-02 15:25:39,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 15:25:39,818 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:39,818 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:40,040 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:40,041 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:40,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:40,041 INFO L82 PathProgramCache]: Analyzing trace with hash 1303085071, now seen corresponding path program 1 times [2021-05-02 15:25:40,041 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:40,042 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825697458] [2021-05-02 15:25:40,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:40,053 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:40,053 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1277513520] [2021-05-02 15:25:40,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:40,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:40,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 15:25:40,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:40,187 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,211 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,216 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,233 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,237 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,288 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,291 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,316 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 15:25:40,316 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:40,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825697458] [2021-05-02 15:25:40,316 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:40,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277513520] [2021-05-02 15:25:40,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1277513520] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:25:40,317 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:25:40,317 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-02 15:25:40,317 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43317991] [2021-05-02 15:25:40,317 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 15:25:40,318 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:40,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 15:25:40,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:25:40,319 INFO L87 Difference]: Start difference. First operand 68 states and 78 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:25:40,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:40,467 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2021-05-02 15:25:40,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 15:25:40,467 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2021-05-02 15:25:40,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:40,468 INFO L225 Difference]: With dead ends: 74 [2021-05-02 15:25:40,468 INFO L226 Difference]: Without dead ends: 58 [2021-05-02 15:25:40,469 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 87.3ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:25:40,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-05-02 15:25:40,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-05-02 15:25:40,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 36 states have (on average 1.1666666666666667) internal successors, (42), 37 states have internal predecessors, (42), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 15:25:40,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-05-02 15:25:40,476 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 36 [2021-05-02 15:25:40,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:40,476 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-05-02 15:25:40,476 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:25:40,476 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-05-02 15:25:40,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-05-02 15:25:40,477 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:40,477 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:40,692 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:40,693 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:40,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:40,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1189074514, now seen corresponding path program 1 times [2021-05-02 15:25:40,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:40,693 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882016517] [2021-05-02 15:25:40,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:40,703 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:40,703 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [68839895] [2021-05-02 15:25:40,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:40,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:40,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 15:25:40,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:40,767 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,769 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,772 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,789 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,792 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,824 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,829 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:40,846 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 15:25:40,846 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:40,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882016517] [2021-05-02 15:25:40,846 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:40,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68839895] [2021-05-02 15:25:40,847 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [68839895] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:25:40,847 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:25:40,847 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 15:25:40,847 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489611853] [2021-05-02 15:25:40,847 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 15:25:40,847 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:40,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 15:25:40,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 15:25:40,848 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:25:40,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:40,890 INFO L93 Difference]: Finished difference Result 74 states and 88 transitions. [2021-05-02 15:25:40,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 15:25:40,890 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) Word has length 38 [2021-05-02 15:25:40,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:40,891 INFO L225 Difference]: With dead ends: 74 [2021-05-02 15:25:40,891 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 15:25:40,892 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 15.0ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:25:40,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 15:25:40,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-05-02 15:25:40,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 38 states have (on average 1.1578947368421053) internal successors, (44), 39 states have internal predecessors, (44), 13 states have call successors, (13), 9 states have call predecessors, (13), 8 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 15:25:40,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 68 transitions. [2021-05-02 15:25:40,917 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 68 transitions. Word has length 38 [2021-05-02 15:25:40,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:40,919 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 68 transitions. [2021-05-02 15:25:40,919 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 4 states have call successors, (7), 4 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 3 states have call successors, (5) [2021-05-02 15:25:40,919 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 68 transitions. [2021-05-02 15:25:40,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 15:25:40,923 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:40,923 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:41,123 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:41,124 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:41,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:41,124 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890039, now seen corresponding path program 1 times [2021-05-02 15:25:41,124 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:41,124 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1578522644] [2021-05-02 15:25:41,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:41,131 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:41,131 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [426529472] [2021-05-02 15:25:41,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:41,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:41,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 15:25:41,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:41,240 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,242 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,256 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,259 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,272 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,316 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,360 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,362 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,373 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,375 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,398 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 18 proven. 9 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 15:25:41,398 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:41,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1578522644] [2021-05-02 15:25:41,398 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:41,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [426529472] [2021-05-02 15:25:41,398 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [426529472] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:25:41,398 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:25:41,399 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 15:25:41,399 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584985424] [2021-05-02 15:25:41,399 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 15:25:41,399 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:41,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 15:25:41,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:25:41,400 INFO L87 Difference]: Start difference. First operand 60 states and 68 transitions. Second operand has 12 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 9 states have internal predecessors, (21), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-02 15:25:41,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:41,674 INFO L93 Difference]: Finished difference Result 101 states and 128 transitions. [2021-05-02 15:25:41,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:25:41,675 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 9 states have internal predecessors, (21), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) Word has length 46 [2021-05-02 15:25:41,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:41,676 INFO L225 Difference]: With dead ends: 101 [2021-05-02 15:25:41,676 INFO L226 Difference]: Without dead ends: 86 [2021-05-02 15:25:41,679 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 102.0ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-02 15:25:41,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-02 15:25:41,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2021-05-02 15:25:41,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 54 states have internal predecessors, (62), 21 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 15:25:41,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 101 transitions. [2021-05-02 15:25:41,690 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 101 transitions. Word has length 46 [2021-05-02 15:25:41,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:41,690 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 101 transitions. [2021-05-02 15:25:41,690 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 9 states have internal predecessors, (21), 4 states have call successors, (9), 2 states have call predecessors, (9), 3 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-05-02 15:25:41,691 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 101 transitions. [2021-05-02 15:25:41,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 15:25:41,695 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:41,695 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:41,908 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:41,909 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:41,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:41,909 INFO L82 PathProgramCache]: Analyzing trace with hash 243046571, now seen corresponding path program 1 times [2021-05-02 15:25:41,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:41,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691540932] [2021-05-02 15:25:41,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:41,919 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:41,919 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [146077298] [2021-05-02 15:25:41,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:41,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:41,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 15:25:41,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:41,983 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,985 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:41,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,033 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,035 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,036 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,075 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,077 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,087 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 42 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 15:25:42,088 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:42,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691540932] [2021-05-02 15:25:42,088 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:42,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146077298] [2021-05-02 15:25:42,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [146077298] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:25:42,088 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:25:42,088 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 15:25:42,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94432656] [2021-05-02 15:25:42,089 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:25:42,089 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:42,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:25:42,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:25:42,089 INFO L87 Difference]: Start difference. First operand 84 states and 101 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 15:25:42,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:42,141 INFO L93 Difference]: Finished difference Result 101 states and 116 transitions. [2021-05-02 15:25:42,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 15:25:42,141 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 54 [2021-05-02 15:25:42,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:42,144 INFO L225 Difference]: With dead ends: 101 [2021-05-02 15:25:42,144 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 15:25:42,144 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 13.0ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:25:42,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 15:25:42,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2021-05-02 15:25:42,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 58 states have (on average 1.1551724137931034) internal successors, (67), 60 states have internal predecessors, (67), 21 states have call successors, (21), 13 states have call predecessors, (21), 12 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 15:25:42,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 106 transitions. [2021-05-02 15:25:42,163 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 106 transitions. Word has length 54 [2021-05-02 15:25:42,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:42,164 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 106 transitions. [2021-05-02 15:25:42,164 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 5 states have internal predecessors, (24), 5 states have call successors, (10), 5 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-02 15:25:42,165 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 106 transitions. [2021-05-02 15:25:42,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-02 15:25:42,166 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:42,166 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:42,380 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 15:25:42,381 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:42,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:42,381 INFO L82 PathProgramCache]: Analyzing trace with hash 244774449, now seen corresponding path program 1 times [2021-05-02 15:25:42,381 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:42,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634346198] [2021-05-02 15:25:42,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:42,389 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:42,389 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [33136666] [2021-05-02 15:25:42,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:42,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:42,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 15:25:42,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:42,512 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,516 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,530 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,533 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,548 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,550 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,561 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,564 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,610 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,649 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,657 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,700 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,731 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,795 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,800 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:42,830 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 15:25:42,831 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:42,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634346198] [2021-05-02 15:25:42,831 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:42,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [33136666] [2021-05-02 15:25:42,831 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [33136666] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:25:42,831 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:25:42,831 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 15:25:42,831 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285951890] [2021-05-02 15:25:42,832 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 15:25:42,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:42,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 15:25:42,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-05-02 15:25:42,833 INFO L87 Difference]: Start difference. First operand 92 states and 106 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 15:25:43,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:43,084 INFO L93 Difference]: Finished difference Result 98 states and 111 transitions. [2021-05-02 15:25:43,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:25:43,085 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), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) Word has length 54 [2021-05-02 15:25:43,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:43,088 INFO L225 Difference]: With dead ends: 98 [2021-05-02 15:25:43,088 INFO L226 Difference]: Without dead ends: 90 [2021-05-02 15:25:43,088 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 173.7ms TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-02 15:25:43,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-02 15:25:43,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-05-02 15:25:43,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 58 states have (on average 1.1206896551724137) internal successors, (65), 59 states have internal predecessors, (65), 18 states have call successors, (18), 14 states have call predecessors, (18), 13 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 15:25:43,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 99 transitions. [2021-05-02 15:25:43,098 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 99 transitions. Word has length 54 [2021-05-02 15:25:43,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:43,098 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 99 transitions. [2021-05-02 15:25:43,098 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), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 15:25:43,098 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 99 transitions. [2021-05-02 15:25:43,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 15:25:43,099 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:43,099 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:43,312 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-05-02 15:25:43,313 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:43,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:43,313 INFO L82 PathProgramCache]: Analyzing trace with hash -318333104, now seen corresponding path program 2 times [2021-05-02 15:25:43,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:43,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656632409] [2021-05-02 15:25:43,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:43,321 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:43,321 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2146918657] [2021-05-02 15:25:43,322 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 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 15:25:43,368 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-05-02 15:25:43,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:25:43,370 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-02 15:25:43,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:43,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:43,485 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-05-02 15:25:43,485 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:43,485 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656632409] [2021-05-02 15:25:43,486 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:43,486 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146918657] [2021-05-02 15:25:43,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146918657] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 15:25:43,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 15:25:43,486 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-05-02 15:25:43,486 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510840806] [2021-05-02 15:25:43,486 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 15:25:43,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:43,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 15:25:43,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:25:43,487 INFO L87 Difference]: Start difference. First operand 90 states and 99 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:25:43,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:43,566 INFO L93 Difference]: Finished difference Result 104 states and 118 transitions. [2021-05-02 15:25:43,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 15:25:43,566 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 56 [2021-05-02 15:25:43,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:43,567 INFO L225 Difference]: With dead ends: 104 [2021-05-02 15:25:43,567 INFO L226 Difference]: Without dead ends: 102 [2021-05-02 15:25:43,568 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 33.9ms TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-05-02 15:25:43,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-05-02 15:25:43,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2021-05-02 15:25:43,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 65 states have (on average 1.1538461538461537) internal successors, (75), 67 states have internal predecessors, (75), 21 states have call successors, (21), 15 states have call predecessors, (21), 14 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 15:25:43,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 115 transitions. [2021-05-02 15:25:43,577 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 115 transitions. Word has length 56 [2021-05-02 15:25:43,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:43,578 INFO L480 AbstractCegarLoop]: Abstraction has 101 states and 115 transitions. [2021-05-02 15:25:43,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 15:25:43,578 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 115 transitions. [2021-05-02 15:25:43,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 15:25:43,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:43,579 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:43,792 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:43,793 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:43,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:43,793 INFO L82 PathProgramCache]: Analyzing trace with hash 940283669, now seen corresponding path program 1 times [2021-05-02 15:25:43,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:43,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603570176] [2021-05-02 15:25:43,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:43,805 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:43,806 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1335156640] [2021-05-02 15:25:43,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:43,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:43,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 15:25:43,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:43,889 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:43,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:43,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:43,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:43,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:43,907 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:43,944 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:43,946 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:43,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:43,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:43,980 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,000 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 36 proven. 46 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-05-02 15:25:44,000 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:44,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603570176] [2021-05-02 15:25:44,001 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:44,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1335156640] [2021-05-02 15:25:44,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1335156640] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:25:44,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:25:44,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 15:25:44,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760248116] [2021-05-02 15:25:44,001 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 15:25:44,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:44,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 15:25:44,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 15:25:44,002 INFO L87 Difference]: Start difference. First operand 101 states and 115 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-02 15:25:44,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:44,064 INFO L93 Difference]: Finished difference Result 128 states and 153 transitions. [2021-05-02 15:25:44,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:25:44,065 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) Word has length 61 [2021-05-02 15:25:44,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:44,067 INFO L225 Difference]: With dead ends: 128 [2021-05-02 15:25:44,067 INFO L226 Difference]: Without dead ends: 103 [2021-05-02 15:25:44,067 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 24.1ms TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:25:44,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-05-02 15:25:44,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2021-05-02 15:25:44,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 67 states have (on average 1.1492537313432836) internal successors, (77), 69 states have internal predecessors, (77), 21 states have call successors, (21), 15 states have call predecessors, (21), 14 states have return successors, (19), 18 states have call predecessors, (19), 19 states have call successors, (19) [2021-05-02 15:25:44,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 117 transitions. [2021-05-02 15:25:44,076 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 117 transitions. Word has length 61 [2021-05-02 15:25:44,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:44,076 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 117 transitions. [2021-05-02 15:25:44,076 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 5 states have internal predecessors, (28), 5 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 4 states have call predecessors, (9), 5 states have call successors, (9) [2021-05-02 15:25:44,076 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 117 transitions. [2021-05-02 15:25:44,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-02 15:25:44,077 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:44,077 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:44,299 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:44,299 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:44,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:44,300 INFO L82 PathProgramCache]: Analyzing trace with hash 1995039641, now seen corresponding path program 2 times [2021-05-02 15:25:44,300 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:44,300 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230129955] [2021-05-02 15:25:44,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:44,310 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:44,310 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [79202045] [2021-05-02 15:25:44,311 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 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 15:25:44,405 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:25:44,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:25:44,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 43 conjunts are in the unsatisfiable core [2021-05-02 15:25:44,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:44,453 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,456 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,468 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,484 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,486 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,569 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,580 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,581 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,590 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,592 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,641 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,676 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,678 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,688 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,689 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:44,712 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 43 proven. 34 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-05-02 15:25:44,713 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:44,713 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230129955] [2021-05-02 15:25:44,713 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:44,713 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79202045] [2021-05-02 15:25:44,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [79202045] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:25:44,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:25:44,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2021-05-02 15:25:44,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473181436] [2021-05-02 15:25:44,714 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-02 15:25:44,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:44,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-02 15:25:44,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-05-02 15:25:44,714 INFO L87 Difference]: Start difference. First operand 103 states and 117 transitions. Second operand has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 10 states have internal predecessors, (24), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 6 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 15:25:45,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:45,119 INFO L93 Difference]: Finished difference Result 163 states and 207 transitions. [2021-05-02 15:25:45,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 15:25:45,120 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 10 states have internal predecessors, (24), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 6 states have call predecessors, (10), 5 states have call successors, (10) Word has length 64 [2021-05-02 15:25:45,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:45,121 INFO L225 Difference]: With dead ends: 163 [2021-05-02 15:25:45,121 INFO L226 Difference]: Without dead ends: 131 [2021-05-02 15:25:45,122 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 152.6ms TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-02 15:25:45,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-02 15:25:45,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 125. [2021-05-02 15:25:45,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 80 states have (on average 1.175) internal successors, (94), 83 states have internal predecessors, (94), 28 states have call successors, (28), 17 states have call predecessors, (28), 16 states have return successors, (26), 24 states have call predecessors, (26), 26 states have call successors, (26) [2021-05-02 15:25:45,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 148 transitions. [2021-05-02 15:25:45,131 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 148 transitions. Word has length 64 [2021-05-02 15:25:45,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:45,132 INFO L480 AbstractCegarLoop]: Abstraction has 125 states and 148 transitions. [2021-05-02 15:25:45,132 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 10 states have internal predecessors, (24), 5 states have call successors, (12), 2 states have call predecessors, (12), 3 states have return successors, (10), 6 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 15:25:45,132 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 148 transitions. [2021-05-02 15:25:45,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 15:25:45,133 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:45,133 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:45,356 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 15:25:45,356 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:45,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:45,357 INFO L82 PathProgramCache]: Analyzing trace with hash 1140868055, now seen corresponding path program 1 times [2021-05-02 15:25:45,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:45,357 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691326496] [2021-05-02 15:25:45,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:45,363 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:45,364 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1578738924] [2021-05-02 15:25:45,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:45,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:45,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 11 conjunts are in the unsatisfiable core [2021-05-02 15:25:45,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:45,430 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,432 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,445 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,446 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,447 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,475 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,476 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,477 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,506 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,508 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,534 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,535 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,546 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 92 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-05-02 15:25:45,546 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:45,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691326496] [2021-05-02 15:25:45,546 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:45,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578738924] [2021-05-02 15:25:45,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578738924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:25:45,547 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:25:45,547 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 15:25:45,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986432017] [2021-05-02 15:25:45,547 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 15:25:45,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:45,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 15:25:45,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-05-02 15:25:45,550 INFO L87 Difference]: Start difference. First operand 125 states and 148 transitions. Second operand has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 15:25:45,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:45,633 INFO L93 Difference]: Finished difference Result 151 states and 173 transitions. [2021-05-02 15:25:45,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 15:25:45,633 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) Word has length 68 [2021-05-02 15:25:45,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:45,635 INFO L225 Difference]: With dead ends: 151 [2021-05-02 15:25:45,635 INFO L226 Difference]: Without dead ends: 138 [2021-05-02 15:25:45,637 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 22.6ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-02 15:25:45,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2021-05-02 15:25:45,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2021-05-02 15:25:45,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 90 states have (on average 1.1444444444444444) internal successors, (103), 92 states have internal predecessors, (103), 28 states have call successors, (28), 19 states have call predecessors, (28), 18 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2021-05-02 15:25:45,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 157 transitions. [2021-05-02 15:25:45,651 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 157 transitions. Word has length 68 [2021-05-02 15:25:45,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:45,651 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 157 transitions. [2021-05-02 15:25:45,651 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 4.428571428571429) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (12), 6 states have call predecessors, (12), 4 states have return successors, (10), 4 states have call predecessors, (10), 5 states have call successors, (10) [2021-05-02 15:25:45,651 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 157 transitions. [2021-05-02 15:25:45,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 15:25:45,652 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:45,652 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:45,874 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 15:25:45,874 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:45,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:45,875 INFO L82 PathProgramCache]: Analyzing trace with hash 1142595933, now seen corresponding path program 1 times [2021-05-02 15:25:45,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:45,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [909585377] [2021-05-02 15:25:45,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:45,888 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:45,888 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [152485674] [2021-05-02 15:25:45,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:45,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:45,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 33 conjunts are in the unsatisfiable core [2021-05-02 15:25:45,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:45,997 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:45,998 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,011 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,023 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,024 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,063 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,065 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,079 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,100 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,159 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,162 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:46,348 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-05-02 15:25:46,348 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:46,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [909585377] [2021-05-02 15:25:46,348 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:46,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [152485674] [2021-05-02 15:25:46,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [152485674] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:25:46,348 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:25:46,348 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 15:25:46,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358530415] [2021-05-02 15:25:46,349 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 15:25:46,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:46,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 15:25:46,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-02 15:25:46,350 INFO L87 Difference]: Start difference. First operand 137 states and 157 transitions. Second operand has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 15:25:46,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:46,557 INFO L93 Difference]: Finished difference Result 151 states and 176 transitions. [2021-05-02 15:25:46,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 15:25:46,557 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) Word has length 68 [2021-05-02 15:25:46,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:46,559 INFO L225 Difference]: With dead ends: 151 [2021-05-02 15:25:46,559 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 15:25:46,559 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 148.1ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-02 15:25:46,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 15:25:46,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 147. [2021-05-02 15:25:46,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 97 states have (on average 1.1649484536082475) internal successors, (113), 99 states have internal predecessors, (113), 30 states have call successors, (30), 20 states have call predecessors, (30), 19 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-02 15:25:46,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 171 transitions. [2021-05-02 15:25:46,572 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 171 transitions. Word has length 68 [2021-05-02 15:25:46,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:46,572 INFO L480 AbstractCegarLoop]: Abstraction has 147 states and 171 transitions. [2021-05-02 15:25:46,572 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0833333333333335) internal successors, (25), 10 states have internal predecessors, (25), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 5 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 15:25:46,572 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 171 transitions. [2021-05-02 15:25:46,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 15:25:46,573 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:46,573 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:46,796 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-05-02 15:25:46,796 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:46,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:46,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1390565976, now seen corresponding path program 2 times [2021-05-02 15:25:46,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:46,797 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820623520] [2021-05-02 15:25:46,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:46,803 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:46,804 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1321530434] [2021-05-02 15:25:46,804 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 15:25:47,019 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 15:25:47,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 15:25:47,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 15:25:47,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:47,091 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,093 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,104 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,105 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,153 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,158 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,168 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,190 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,192 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,202 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,204 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,250 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,252 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,261 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,262 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,288 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 46 proven. 24 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2021-05-02 15:25:47,288 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 15:25:47,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820623520] [2021-05-02 15:25:47,288 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 15:25:47,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1321530434] [2021-05-02 15:25:47,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1321530434] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 15:25:47,288 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 15:25:47,288 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 15:25:47,290 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166606430] [2021-05-02 15:25:47,291 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 15:25:47,291 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 15:25:47,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 15:25:47,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-02 15:25:47,291 INFO L87 Difference]: Start difference. First operand 147 states and 171 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 6 states have call predecessors, (11), 6 states have call successors, (11) [2021-05-02 15:25:47,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 15:25:47,587 INFO L93 Difference]: Finished difference Result 174 states and 206 transitions. [2021-05-02 15:25:47,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 15:25:47,588 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 6 states have call predecessors, (11), 6 states have call successors, (11) Word has length 73 [2021-05-02 15:25:47,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 15:25:47,588 INFO L225 Difference]: With dead ends: 174 [2021-05-02 15:25:47,589 INFO L226 Difference]: Without dead ends: 149 [2021-05-02 15:25:47,589 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 62 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 153.7ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-02 15:25:47,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2021-05-02 15:25:47,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 149. [2021-05-02 15:25:47,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 97 states have (on average 1.134020618556701) internal successors, (110), 100 states have internal predecessors, (110), 31 states have call successors, (31), 21 states have call predecessors, (31), 20 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2021-05-02 15:25:47,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 169 transitions. [2021-05-02 15:25:47,600 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 169 transitions. Word has length 73 [2021-05-02 15:25:47,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 15:25:47,600 INFO L480 AbstractCegarLoop]: Abstraction has 149 states and 169 transitions. [2021-05-02 15:25:47,600 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 9 states have internal predecessors, (28), 6 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (11), 6 states have call predecessors, (11), 6 states have call successors, (11) [2021-05-02 15:25:47,600 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 169 transitions. [2021-05-02 15:25:47,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-02 15:25:47,602 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 15:25:47,602 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 15:25:47,824 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 15:25:47,825 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 15:25:47,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 15:25:47,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1792978632, now seen corresponding path program 1 times [2021-05-02 15:25:47,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 15:25:47,825 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413449516] [2021-05-02 15:25:47,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 15:25:47,838 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 15:25:47,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [422288720] [2021-05-02 15:25:47,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 15:25:47,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 15:25:47,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 36 conjunts are in the unsatisfiable core [2021-05-02 15:25:47,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 15:25:47,947 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,950 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,961 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,963 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:47,975 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,026 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,055 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,059 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,082 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,086 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,151 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,155 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,177 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,181 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,196 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,198 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,270 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,277 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,466 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,495 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,511 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,554 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,568 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:48,624 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:55,795 WARN L205 SmtUtils]: Spent 7.07 s on a formula simplification. DAG size of input: 89 DAG size of output: 80 [2021-05-02 15:25:55,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:55,817 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:55,827 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:55,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:55,843 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,247 WARN L205 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 77 DAG size of output: 74 [2021-05-02 15:25:56,714 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,793 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,891 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,898 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,904 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,918 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,925 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,931 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,937 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,973 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,979 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,984 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:56,995 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:57,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:57,004 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:57,009 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:57,021 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:57,112 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:57,118 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:57,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:57,299 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:57,326 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 15:25:58,181 WARN L159 QuantifierPusher]: Ignoring assumption.