/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/sqrt1-ll_valuebound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 17:25:38,391 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 17:25:38,393 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 17:25:38,426 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 17:25:38,442 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 17:25:38,443 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 17:25:38,444 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 17:25:38,445 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 17:25:38,447 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 17:25:38,448 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 17:25:38,450 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 17:25:38,455 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 17:25:38,456 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 17:25:38,457 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 17:25:38,459 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 17:25:38,460 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 17:25:38,465 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 17:25:38,479 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 17:25:38,480 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 17:25:38,480 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 17:25:38,481 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 17:25:38,510 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 17:25:38,510 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 17:25:38,512 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 17:25:38,512 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 17:25:38,512 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 17:25:38,513 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 17:25:38,513 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 17:25:38,513 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 17:25:38,513 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 17:25:38,513 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 17:25:38,514 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 17:25:38,514 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 17:25:38,514 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 17:25:38,514 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 17:25:38,514 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 17:25:38,514 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 17:25:38,514 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 17:25:38,515 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 17:25:38,515 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 17:25:38,515 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 17:25:38,515 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 17:25:38,515 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 17:25:38,515 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 17:25:38,516 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 17:25:38,516 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 17:25:38,516 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 17:25:38,516 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 17:25:38,516 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 17:25:38,516 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 17:25:38,792 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 17:25:38,828 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 17:25:38,830 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 17:25:38,830 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 17:25:38,831 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 17:25:38,831 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_valuebound50.c [2021-05-02 17:25:38,881 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c60f0747a/af7afef273cd4b9584c6dfe02815ce57/FLAGe617c52db [2021-05-02 17:25:39,224 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 17:25:39,225 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/sqrt1-ll_valuebound50.c [2021-05-02 17:25:39,229 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c60f0747a/af7afef273cd4b9584c6dfe02815ce57/FLAGe617c52db [2021-05-02 17:25:39,240 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c60f0747a/af7afef273cd4b9584c6dfe02815ce57 [2021-05-02 17:25:39,242 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 17:25:39,243 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 17:25:39,244 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 17:25:39,244 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 17:25:39,246 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 17:25:39,247 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:25:39" (1/1) ... [2021-05-02 17:25:39,248 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@979bde7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:25:39, skipping insertion in model container [2021-05-02 17:25:39,248 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 05:25:39" (1/1) ... [2021-05-02 17:25:39,252 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 17:25:39,261 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 17:25:39,359 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/sqrt1-ll_valuebound50.c[520,533] [2021-05-02 17:25:39,377 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:25:39,383 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 17:25:39,422 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/sqrt1-ll_valuebound50.c[520,533] [2021-05-02 17:25:39,437 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 17:25:39,448 INFO L208 MainTranslator]: Completed translation [2021-05-02 17:25:39,449 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:25:39 WrapperNode [2021-05-02 17:25:39,449 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 17:25:39,450 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 17:25:39,450 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 17:25:39,451 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 17:25:39,458 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:25:39" (1/1) ... [2021-05-02 17:25:39,459 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:25:39" (1/1) ... [2021-05-02 17:25:39,465 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:25:39" (1/1) ... [2021-05-02 17:25:39,465 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:25:39" (1/1) ... [2021-05-02 17:25:39,475 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:25:39" (1/1) ... [2021-05-02 17:25:39,478 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:25:39" (1/1) ... [2021-05-02 17:25:39,480 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:25:39" (1/1) ... [2021-05-02 17:25:39,484 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 17:25:39,485 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 17:25:39,485 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 17:25:39,485 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 17:25:39,486 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:25:39" (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 17:25:39,535 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 17:25:39,536 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 17:25:39,536 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 17:25:39,536 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 17:25:39,536 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 17:25:39,536 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 17:25:39,536 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 17:25:39,537 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 17:25:39,537 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 17:25:39,537 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 17:25:39,537 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 17:25:39,537 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 17:25:39,538 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 17:25:39,538 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 17:25:39,538 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 17:25:39,538 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 17:25:39,538 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 17:25:39,539 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 17:25:39,539 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 17:25:39,539 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 17:25:39,772 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 17:25:39,781 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 17:25:39,782 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:25:39 BoogieIcfgContainer [2021-05-02 17:25:39,782 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 17:25:39,783 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 17:25:39,783 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 17:25:39,785 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 17:25:39,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 05:25:39" (1/3) ... [2021-05-02 17:25:39,786 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ca35e9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:25:39, skipping insertion in model container [2021-05-02 17:25:39,786 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 05:25:39" (2/3) ... [2021-05-02 17:25:39,786 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ca35e9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 05:25:39, skipping insertion in model container [2021-05-02 17:25:39,786 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 05:25:39" (3/3) ... [2021-05-02 17:25:39,787 INFO L111 eAbstractionObserver]: Analyzing ICFG sqrt1-ll_valuebound50.c [2021-05-02 17:25:39,791 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 17:25:39,794 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 17:25:39,806 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 17:25:39,835 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 17:25:39,835 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 17:25:39,835 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 17:25:39,835 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 17:25:39,835 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 17:25:39,835 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 17:25:39,835 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 17:25:39,836 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 17:25:39,865 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-02 17:25:39,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:25:39,868 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:39,869 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:39,869 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:39,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:39,872 INFO L82 PathProgramCache]: Analyzing trace with hash 326851384, now seen corresponding path program 1 times [2021-05-02 17:25:39,880 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:39,880 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2088796091] [2021-05-02 17:25:39,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:39,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:25:40,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:25:40,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:25:40,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 17:25:40,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:25:40,087 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 17:25:40,087 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:40,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2088796091] [2021-05-02 17:25:40,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2088796091] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:25:40,088 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:25:40,088 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 17:25:40,089 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503973398] [2021-05-02 17:25:40,092 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 17:25:40,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:40,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 17:25:40,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:25:40,105 INFO L87 Difference]: Start difference. First operand has 31 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (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 17:25:40,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:40,207 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2021-05-02 17:25:40,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 17:25:40,209 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (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 17 [2021-05-02 17:25:40,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:40,213 INFO L225 Difference]: With dead ends: 53 [2021-05-02 17:25:40,214 INFO L226 Difference]: Without dead ends: 26 [2021-05-02 17:25:40,216 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 43.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 17:25:40,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-02 17:25:40,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-02 17:25:40,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 9 states have call successors, (9), 4 states have call predecessors, (9), 3 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 17:25:40,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2021-05-02 17:25:40,242 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 17 [2021-05-02 17:25:40,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:40,242 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2021-05-02 17:25:40,242 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (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 17:25:40,243 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2021-05-02 17:25:40,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-02 17:25:40,244 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:40,245 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:40,245 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 17:25:40,245 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:40,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:40,246 INFO L82 PathProgramCache]: Analyzing trace with hash 1008578050, now seen corresponding path program 1 times [2021-05-02 17:25:40,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:40,247 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093453487] [2021-05-02 17:25:40,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:40,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:25:40,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 17:25:40,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:25:40,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 17:25:40,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:25:40,364 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 17:25:40,364 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:40,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093453487] [2021-05-02 17:25:40,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1093453487] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 17:25:40,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 17:25:40,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-02 17:25:40,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587527384] [2021-05-02 17:25:40,366 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:25:40,366 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:40,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:25:40,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:25:40,366 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 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 17:25:40,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:40,608 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2021-05-02 17:25:40,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:25:40,608 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 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 17 [2021-05-02 17:25:40,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:40,609 INFO L225 Difference]: With dead ends: 40 [2021-05-02 17:25:40,610 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 17:25:40,610 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 123.7ms TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:25:40,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 17:25:40,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 36. [2021-05-02 17:25:40,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 20 states have internal predecessors, (21), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 17:25:40,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 45 transitions. [2021-05-02 17:25:40,620 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 45 transitions. Word has length 17 [2021-05-02 17:25:40,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:40,620 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 45 transitions. [2021-05-02 17:25:40,621 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 4 states have internal predecessors, (11), 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 17:25:40,621 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 45 transitions. [2021-05-02 17:25:40,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-02 17:25:40,621 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:40,621 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] [2021-05-02 17:25:40,621 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-02 17:25:40,622 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:40,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:40,622 INFO L82 PathProgramCache]: Analyzing trace with hash -789682422, now seen corresponding path program 1 times [2021-05-02 17:25:40,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:40,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356443153] [2021-05-02 17:25:40,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:40,632 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:40,637 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2087950200] [2021-05-02 17:25:40,637 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 17:25:40,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:25:40,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 17:25:40,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:40,879 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-02 17:25:40,880 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:40,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356443153] [2021-05-02 17:25:40,880 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:40,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087950200] [2021-05-02 17:25:40,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087950200] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:40,880 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:40,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:25:40,880 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602642680] [2021-05-02 17:25:40,881 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:25:40,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:40,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:25:40,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:25:40,881 INFO L87 Difference]: Start difference. First operand 36 states and 45 transitions. Second operand has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 17:25:41,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:41,017 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2021-05-02 17:25:41,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:25:41,018 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 22 [2021-05-02 17:25:41,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:41,020 INFO L225 Difference]: With dead ends: 44 [2021-05-02 17:25:41,020 INFO L226 Difference]: Without dead ends: 39 [2021-05-02 17:25:41,021 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 55.7ms TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:25:41,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-05-02 17:25:41,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2021-05-02 17:25:41,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 22 states have internal predecessors, (23), 12 states have call successors, (12), 6 states have call predecessors, (12), 5 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 17:25:41,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2021-05-02 17:25:41,038 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 22 [2021-05-02 17:25:41,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:41,039 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2021-05-02 17:25:41,039 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-02 17:25:41,039 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2021-05-02 17:25:41,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 17:25:41,041 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:41,041 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 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 17:25:41,260 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-02 17:25:41,261 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:41,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:41,262 INFO L82 PathProgramCache]: Analyzing trace with hash -2092280728, now seen corresponding path program 1 times [2021-05-02 17:25:41,262 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:41,262 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602776230] [2021-05-02 17:25:41,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:41,270 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:41,270 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [989030081] [2021-05-02 17:25:41,271 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 17:25:41,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:25:41,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2021-05-02 17:25:41,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:41,450 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 17:25:41,451 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:41,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602776230] [2021-05-02 17:25:41,451 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:41,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [989030081] [2021-05-02 17:25:41,451 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [989030081] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:41,451 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:41,451 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 17:25:41,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033238895] [2021-05-02 17:25:41,452 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 17:25:41,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:41,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 17:25:41,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 17:25:41,452 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 17:25:41,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:41,527 INFO L93 Difference]: Finished difference Result 53 states and 64 transitions. [2021-05-02 17:25:41,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 17:25:41,527 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2021-05-02 17:25:41,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:41,530 INFO L225 Difference]: With dead ends: 53 [2021-05-02 17:25:41,530 INFO L226 Difference]: Without dead ends: 51 [2021-05-02 17:25:41,530 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.3ms TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:25:41,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-05-02 17:25:41,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 49. [2021-05-02 17:25:41,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 28 states have internal predecessors, (29), 16 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-02 17:25:41,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 59 transitions. [2021-05-02 17:25:41,545 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 59 transitions. Word has length 34 [2021-05-02 17:25:41,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:41,546 INFO L480 AbstractCegarLoop]: Abstraction has 49 states and 59 transitions. [2021-05-02 17:25:41,546 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 1 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 17:25:41,546 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 59 transitions. [2021-05-02 17:25:41,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 17:25:41,547 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:41,547 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 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 17:25:41,749 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:41,750 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:41,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:41,750 INFO L82 PathProgramCache]: Analyzing trace with hash 398970980, now seen corresponding path program 2 times [2021-05-02 17:25:41,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:41,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [725310806] [2021-05-02 17:25:41,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:41,758 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:41,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2090069174] [2021-05-02 17:25:41,758 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:41,816 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:25:41,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:41,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 17:25:41,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:41,932 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 7 proven. 13 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 17:25:41,933 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:41,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [725310806] [2021-05-02 17:25:41,933 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:41,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090069174] [2021-05-02 17:25:41,933 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2090069174] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:41,933 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:41,933 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:25:41,933 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533295733] [2021-05-02 17:25:41,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:25:41,934 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:41,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:25:41,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:25:41,938 INFO L87 Difference]: Start difference. First operand 49 states and 59 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 17:25:42,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:42,071 INFO L93 Difference]: Finished difference Result 57 states and 67 transitions. [2021-05-02 17:25:42,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:25:42,072 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 39 [2021-05-02 17:25:42,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:42,073 INFO L225 Difference]: With dead ends: 57 [2021-05-02 17:25:42,073 INFO L226 Difference]: Without dead ends: 55 [2021-05-02 17:25:42,075 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 49.2ms TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:25:42,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-02 17:25:42,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-05-02 17:25:42,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 29 states have (on average 1.103448275862069) internal successors, (32), 31 states have internal predecessors, (32), 17 states have call successors, (17), 8 states have call predecessors, (17), 7 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 17:25:42,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 64 transitions. [2021-05-02 17:25:42,083 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 64 transitions. Word has length 39 [2021-05-02 17:25:42,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:42,083 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 64 transitions. [2021-05-02 17:25:42,083 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 17:25:42,083 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 64 transitions. [2021-05-02 17:25:42,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-05-02 17:25:42,084 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:42,084 INFO L523 BasicCegarLoop]: trace histogram [6, 5, 5, 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 17:25:42,301 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:42,301 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:42,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:42,302 INFO L82 PathProgramCache]: Analyzing trace with hash 1537313192, now seen corresponding path program 3 times [2021-05-02 17:25:42,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:42,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038371401] [2021-05-02 17:25:42,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:42,310 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:42,310 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1056676342] [2021-05-02 17:25:42,310 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:42,362 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-02 17:25:42,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:42,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-02 17:25:42,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:42,398 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:42,487 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 10 proven. 4 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-05-02 17:25:42,488 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:42,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038371401] [2021-05-02 17:25:42,488 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:42,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056676342] [2021-05-02 17:25:42,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056676342] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:42,488 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:42,488 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:25:42,488 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263901372] [2021-05-02 17:25:42,488 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:25:42,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:42,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:25:42,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:25:42,489 INFO L87 Difference]: Start difference. First operand 54 states and 64 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 17:25:42,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:42,577 INFO L93 Difference]: Finished difference Result 61 states and 70 transitions. [2021-05-02 17:25:42,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:25:42,577 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 44 [2021-05-02 17:25:42,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:42,578 INFO L225 Difference]: With dead ends: 61 [2021-05-02 17:25:42,578 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 17:25:42,579 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 39.5ms TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:25:42,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 17:25:42,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-05-02 17:25:42,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 32 states have (on average 1.0625) internal successors, (34), 33 states have internal predecessors, (34), 15 states have call successors, (15), 9 states have call predecessors, (15), 8 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-05-02 17:25:42,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 62 transitions. [2021-05-02 17:25:42,585 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 62 transitions. Word has length 44 [2021-05-02 17:25:42,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:42,585 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 62 transitions. [2021-05-02 17:25:42,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 17:25:42,585 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 62 transitions. [2021-05-02 17:25:42,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 17:25:42,586 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:42,586 INFO L523 BasicCegarLoop]: trace histogram [7, 6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:42,800 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:42,801 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:42,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:42,801 INFO L82 PathProgramCache]: Analyzing trace with hash -463567166, now seen corresponding path program 4 times [2021-05-02 17:25:42,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:42,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339334586] [2021-05-02 17:25:42,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:42,809 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:42,809 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1080687113] [2021-05-02 17:25:42,809 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:42,855 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:25:42,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:42,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-02 17:25:42,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:42,961 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-05-02 17:25:42,961 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:42,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339334586] [2021-05-02 17:25:42,961 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:42,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080687113] [2021-05-02 17:25:42,961 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1080687113] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:42,961 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:42,961 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-02 17:25:42,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266506954] [2021-05-02 17:25:42,962 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-02 17:25:42,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:42,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-02 17:25:42,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-05-02 17:25:42,962 INFO L87 Difference]: Start difference. First operand 56 states and 62 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 17:25:43,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:43,043 INFO L93 Difference]: Finished difference Result 70 states and 81 transitions. [2021-05-02 17:25:43,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-02 17:25:43,044 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 51 [2021-05-02 17:25:43,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:43,047 INFO L225 Difference]: With dead ends: 70 [2021-05-02 17:25:43,047 INFO L226 Difference]: Without dead ends: 68 [2021-05-02 17:25:43,047 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 25.7ms TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:25:43,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-05-02 17:25:43,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2021-05-02 17:25:43,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 37 states have (on average 1.0810810810810811) internal successors, (40), 39 states have internal predecessors, (40), 19 states have call successors, (19), 10 states have call predecessors, (19), 9 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17) [2021-05-02 17:25:43,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 76 transitions. [2021-05-02 17:25:43,055 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 76 transitions. Word has length 51 [2021-05-02 17:25:43,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:43,055 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 76 transitions. [2021-05-02 17:25:43,055 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 4 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 17:25:43,055 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 76 transitions. [2021-05-02 17:25:43,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-02 17:25:43,056 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:43,056 INFO L523 BasicCegarLoop]: trace histogram [8, 7, 7, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:43,268 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-05-02 17:25:43,269 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:43,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:43,269 INFO L82 PathProgramCache]: Analyzing trace with hash 790038090, now seen corresponding path program 5 times [2021-05-02 17:25:43,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:43,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275342836] [2021-05-02 17:25:43,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:43,276 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:43,276 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [188079804] [2021-05-02 17:25:43,276 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:25:43,318 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2021-05-02 17:25:43,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:43,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 29 conjunts are in the unsatisfiable core [2021-05-02 17:25:43,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:43,459 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 13 proven. 30 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-05-02 17:25:43,459 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:43,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275342836] [2021-05-02 17:25:43,459 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:43,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188079804] [2021-05-02 17:25:43,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [188079804] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:43,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:43,459 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:25:43,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657266040] [2021-05-02 17:25:43,460 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:25:43,463 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:43,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:25:43,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:25:43,463 INFO L87 Difference]: Start difference. First operand 66 states and 76 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 17:25:43,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:43,593 INFO L93 Difference]: Finished difference Result 74 states and 84 transitions. [2021-05-02 17:25:43,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:25:43,593 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) Word has length 56 [2021-05-02 17:25:43,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:43,594 INFO L225 Difference]: With dead ends: 74 [2021-05-02 17:25:43,594 INFO L226 Difference]: Without dead ends: 72 [2021-05-02 17:25:43,595 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 44.8ms TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:25:43,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2021-05-02 17:25:43,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2021-05-02 17:25:43,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 40 states have (on average 1.075) internal successors, (43), 42 states have internal predecessors, (43), 20 states have call successors, (20), 11 states have call predecessors, (20), 10 states have return successors, (18), 17 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 17:25:43,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 81 transitions. [2021-05-02 17:25:43,603 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 81 transitions. Word has length 56 [2021-05-02 17:25:43,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:43,603 INFO L480 AbstractCegarLoop]: Abstraction has 71 states and 81 transitions. [2021-05-02 17:25:43,603 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 8 states have internal predecessors, (21), 4 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 4 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-02 17:25:43,603 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 81 transitions. [2021-05-02 17:25:43,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-05-02 17:25:43,604 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:43,604 INFO L523 BasicCegarLoop]: trace histogram [9, 8, 8, 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 17:25:43,823 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:43,823 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:43,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:43,823 INFO L82 PathProgramCache]: Analyzing trace with hash 1996886914, now seen corresponding path program 6 times [2021-05-02 17:25:43,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:43,823 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079162791] [2021-05-02 17:25:43,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:43,840 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:43,840 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1985820753] [2021-05-02 17:25:43,840 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:25:43,899 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2021-05-02 17:25:43,900 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:43,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 38 conjunts are in the unsatisfiable core [2021-05-02 17:25:43,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:43,933 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:43,935 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:43,958 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:43,959 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:43,966 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:43,967 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:43,990 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:43,991 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:44,000 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:44,001 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:44,012 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:44,013 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:44,126 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 40 proven. 34 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-05-02 17:25:44,127 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:44,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079162791] [2021-05-02 17:25:44,127 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:44,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1985820753] [2021-05-02 17:25:44,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1985820753] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:44,127 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:44,127 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2021-05-02 17:25:44,127 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964949796] [2021-05-02 17:25:44,127 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-02 17:25:44,127 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:44,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-02 17:25:44,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:25:44,128 INFO L87 Difference]: Start difference. First operand 71 states and 81 transitions. Second operand has 11 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 17:25:44,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:44,271 INFO L93 Difference]: Finished difference Result 78 states and 87 transitions. [2021-05-02 17:25:44,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:25:44,271 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) Word has length 61 [2021-05-02 17:25:44,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:44,277 INFO L225 Difference]: With dead ends: 78 [2021-05-02 17:25:44,277 INFO L226 Difference]: Without dead ends: 73 [2021-05-02 17:25:44,277 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 50 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 101.8ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:25:44,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-05-02 17:25:44,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2021-05-02 17:25:44,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 43 states have (on average 1.0465116279069768) internal successors, (45), 44 states have internal predecessors, (45), 18 states have call successors, (18), 12 states have call predecessors, (18), 11 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-05-02 17:25:44,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 79 transitions. [2021-05-02 17:25:44,290 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 79 transitions. Word has length 61 [2021-05-02 17:25:44,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:44,291 INFO L480 AbstractCegarLoop]: Abstraction has 73 states and 79 transitions. [2021-05-02 17:25:44,291 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (10), 6 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-02 17:25:44,291 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 79 transitions. [2021-05-02 17:25:44,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-02 17:25:44,297 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:44,297 INFO L523 BasicCegarLoop]: trace histogram [10, 9, 9, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:44,504 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:44,505 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:44,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:44,505 INFO L82 PathProgramCache]: Analyzing trace with hash -415362136, now seen corresponding path program 7 times [2021-05-02 17:25:44,505 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:44,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [221626096] [2021-05-02 17:25:44,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:44,512 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:44,512 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1241293515] [2021-05-02 17:25:44,512 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:25:44,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:25:44,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-02 17:25:44,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:44,691 INFO L134 CoverageAnalysis]: Checked inductivity of 183 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2021-05-02 17:25:44,693 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:44,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [221626096] [2021-05-02 17:25:44,693 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:44,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241293515] [2021-05-02 17:25:44,693 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241293515] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:44,693 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:44,693 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:25:44,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749710469] [2021-05-02 17:25:44,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:25:44,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:44,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:25:44,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:25:44,694 INFO L87 Difference]: Start difference. First operand 73 states and 79 transitions. Second operand has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-02 17:25:44,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:44,785 INFO L93 Difference]: Finished difference Result 87 states and 98 transitions. [2021-05-02 17:25:44,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:25:44,786 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) Word has length 68 [2021-05-02 17:25:44,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:44,786 INFO L225 Difference]: With dead ends: 87 [2021-05-02 17:25:44,786 INFO L226 Difference]: Without dead ends: 85 [2021-05-02 17:25:44,787 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 34.9ms TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:25:44,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-02 17:25:44,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 83. [2021-05-02 17:25:44,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 48 states have (on average 1.0625) internal successors, (51), 50 states have internal predecessors, (51), 22 states have call successors, (22), 13 states have call predecessors, (22), 12 states have return successors, (20), 19 states have call predecessors, (20), 20 states have call successors, (20) [2021-05-02 17:25:44,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 93 transitions. [2021-05-02 17:25:44,793 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 93 transitions. Word has length 68 [2021-05-02 17:25:44,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:44,794 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 93 transitions. [2021-05-02 17:25:44,794 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.5) internal successors, (20), 7 states have internal predecessors, (20), 5 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (11), 4 states have call predecessors, (11), 4 states have call successors, (11) [2021-05-02 17:25:44,794 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 93 transitions. [2021-05-02 17:25:44,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-02 17:25:44,794 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:44,794 INFO L523 BasicCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:45,008 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-05-02 17:25:45,009 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:45,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:45,009 INFO L82 PathProgramCache]: Analyzing trace with hash -1903584988, now seen corresponding path program 8 times [2021-05-02 17:25:45,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:45,009 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [671076959] [2021-05-02 17:25:45,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:45,015 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:45,015 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [767119505] [2021-05-02 17:25:45,015 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 17:25:45,067 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:25:45,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:45,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 35 conjunts are in the unsatisfiable core [2021-05-02 17:25:45,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:45,233 INFO L134 CoverageAnalysis]: Checked inductivity of 224 backedges. 19 proven. 52 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-05-02 17:25:45,233 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:25:45,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [671076959] [2021-05-02 17:25:45,233 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:25:45,233 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [767119505] [2021-05-02 17:25:45,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [767119505] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:25:45,233 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:25:45,233 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 17:25:45,233 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248521478] [2021-05-02 17:25:45,234 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 17:25:45,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:25:45,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 17:25:45,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:25:45,234 INFO L87 Difference]: Start difference. First operand 83 states and 93 transitions. Second operand has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-02 17:25:45,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:25:45,409 INFO L93 Difference]: Finished difference Result 91 states and 101 transitions. [2021-05-02 17:25:45,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 17:25:45,417 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) Word has length 73 [2021-05-02 17:25:45,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:25:45,420 INFO L225 Difference]: With dead ends: 91 [2021-05-02 17:25:45,420 INFO L226 Difference]: Without dead ends: 89 [2021-05-02 17:25:45,420 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 63 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 67.6ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:25:45,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-05-02 17:25:45,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2021-05-02 17:25:45,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 51 states have (on average 1.0588235294117647) internal successors, (54), 53 states have internal predecessors, (54), 23 states have call successors, (23), 14 states have call predecessors, (23), 13 states have return successors, (21), 20 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 17:25:45,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 98 transitions. [2021-05-02 17:25:45,430 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 98 transitions. Word has length 73 [2021-05-02 17:25:45,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:25:45,430 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 98 transitions. [2021-05-02 17:25:45,430 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.3) internal successors, (23), 9 states have internal predecessors, (23), 5 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 5 states have call predecessors, (12), 5 states have call successors, (12) [2021-05-02 17:25:45,430 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 98 transitions. [2021-05-02 17:25:45,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-02 17:25:45,431 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:25:45,431 INFO L523 BasicCegarLoop]: trace histogram [12, 11, 11, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:25:45,631 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:45,633 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:25:45,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:25:45,634 INFO L82 PathProgramCache]: Analyzing trace with hash -2040579864, now seen corresponding path program 9 times [2021-05-02 17:25:45,634 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:25:45,634 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667844379] [2021-05-02 17:25:45,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:25:45,639 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:25:45,639 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [661594988] [2021-05-02 17:25:45,639 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:25:45,743 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 17:25:45,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:25:45,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 27 conjunts are in the unsatisfiable core [2021-05-02 17:25:45,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:25:45,748 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:45,750 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:45,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:25:45,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:00,751 WARN L205 SmtUtils]: Spent 6.03 s on a formula simplification that was a NOOP. DAG size: 22 [2021-05-02 17:26:00,759 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:00,761 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:00,780 INFO L134 CoverageAnalysis]: Checked inductivity of 269 backedges. 105 proven. 3 refuted. 0 times theorem prover too weak. 161 trivial. 0 not checked. [2021-05-02 17:26:00,780 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:26:00,780 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667844379] [2021-05-02 17:26:00,780 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:26:00,780 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [661594988] [2021-05-02 17:26:00,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [661594988] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:26:00,780 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:26:00,781 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:26:00,781 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596579816] [2021-05-02 17:26:00,781 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:26:00,782 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:26:00,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:26:00,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=52, Unknown=2, NotChecked=0, Total=72 [2021-05-02 17:26:00,782 INFO L87 Difference]: Start difference. First operand 88 states and 98 transitions. Second operand has 9 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 17:26:11,413 WARN L205 SmtUtils]: Spent 10.62 s on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2021-05-02 17:26:33,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:26:33,940 INFO L93 Difference]: Finished difference Result 102 states and 109 transitions. [2021-05-02 17:26:33,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:26:33,941 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) Word has length 78 [2021-05-02 17:26:33,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:26:33,941 INFO L225 Difference]: With dead ends: 102 [2021-05-02 17:26:33,941 INFO L226 Difference]: Without dead ends: 93 [2021-05-02 17:26:33,942 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 25553.8ms TimeCoverageRelationStatistics Valid=34, Invalid=96, Unknown=2, NotChecked=0, Total=132 [2021-05-02 17:26:33,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-02 17:26:33,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 93. [2021-05-02 17:26:33,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 57 states have (on average 1.0350877192982457) internal successors, (59), 58 states have internal predecessors, (59), 20 states have call successors, (20), 16 states have call predecessors, (20), 15 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-05-02 17:26:33,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 97 transitions. [2021-05-02 17:26:33,950 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 97 transitions. Word has length 78 [2021-05-02 17:26:33,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:26:33,950 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 97 transitions. [2021-05-02 17:26:33,951 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 17:26:33,951 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 97 transitions. [2021-05-02 17:26:33,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-05-02 17:26:33,951 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:26:33,951 INFO L523 BasicCegarLoop]: trace histogram [13, 12, 12, 5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:26:34,152 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:26:34,152 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:26:34,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:26:34,152 INFO L82 PathProgramCache]: Analyzing trace with hash -2131153022, now seen corresponding path program 10 times [2021-05-02 17:26:34,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:26:34,153 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164379037] [2021-05-02 17:26:34,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:26:34,161 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:26:34,162 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [708320347] [2021-05-02 17:26:34,162 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:26:34,212 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-02 17:26:34,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:26:34,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 17:26:34,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:26:34,376 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 24 proven. 38 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2021-05-02 17:26:34,376 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:26:34,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164379037] [2021-05-02 17:26:34,376 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:26:34,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [708320347] [2021-05-02 17:26:34,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [708320347] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:26:34,376 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:26:34,376 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:26:34,377 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824978409] [2021-05-02 17:26:34,377 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:26:34,377 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:26:34,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:26:34,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:26:34,378 INFO L87 Difference]: Start difference. First operand 93 states and 97 transitions. Second operand has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-02 17:26:34,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:26:34,504 INFO L93 Difference]: Finished difference Result 110 states and 117 transitions. [2021-05-02 17:26:34,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:26:34,504 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) Word has length 85 [2021-05-02 17:26:34,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:26:34,508 INFO L225 Difference]: With dead ends: 110 [2021-05-02 17:26:34,508 INFO L226 Difference]: Without dead ends: 108 [2021-05-02 17:26:34,508 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.4ms TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 17:26:34,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2021-05-02 17:26:34,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2021-05-02 17:26:34,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 67 states have internal predecessors, (68), 24 states have call successors, (24), 18 states have call predecessors, (24), 17 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2021-05-02 17:26:34,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 114 transitions. [2021-05-02 17:26:34,519 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 114 transitions. Word has length 85 [2021-05-02 17:26:34,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:26:34,520 INFO L480 AbstractCegarLoop]: Abstraction has 107 states and 114 transitions. [2021-05-02 17:26:34,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.4444444444444446) internal successors, (22), 8 states have internal predecessors, (22), 6 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 5 states have call predecessors, (14), 5 states have call successors, (14) [2021-05-02 17:26:34,520 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 114 transitions. [2021-05-02 17:26:34,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-05-02 17:26:34,521 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:26:34,521 INFO L523 BasicCegarLoop]: trace histogram [14, 13, 13, 5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:26:34,728 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-02 17:26:34,729 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:26:34,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:26:34,729 INFO L82 PathProgramCache]: Analyzing trace with hash 1485297034, now seen corresponding path program 11 times [2021-05-02 17:26:34,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:26:34,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692711268] [2021-05-02 17:26:34,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:26:34,734 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:26:34,734 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [323484095] [2021-05-02 17:26:34,734 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:26:34,858 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-05-02 17:26:34,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:26:34,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 51 conjunts are in the unsatisfiable core [2021-05-02 17:26:34,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:26:34,890 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:34,893 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:34,901 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:34,903 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:34,910 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:34,911 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:34,954 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:34,955 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:35,120 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 59 proven. 99 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-05-02 17:26:35,121 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:26:35,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692711268] [2021-05-02 17:26:35,121 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:26:35,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [323484095] [2021-05-02 17:26:35,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [323484095] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:26:35,121 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:26:35,121 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 17:26:35,122 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621020090] [2021-05-02 17:26:35,122 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:26:35,122 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:26:35,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:26:35,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:26:35,122 INFO L87 Difference]: Start difference. First operand 107 states and 114 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 7 states have call predecessors, (15), 7 states have call successors, (15) [2021-05-02 17:26:35,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:26:35,370 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2021-05-02 17:26:35,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-02 17:26:35,370 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 7 states have call predecessors, (15), 7 states have call successors, (15) Word has length 90 [2021-05-02 17:26:35,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:26:35,371 INFO L225 Difference]: With dead ends: 118 [2021-05-02 17:26:35,371 INFO L226 Difference]: Without dead ends: 110 [2021-05-02 17:26:35,372 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 118.2ms TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:26:35,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-05-02 17:26:35,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2021-05-02 17:26:35,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 68 states have (on average 1.0294117647058822) internal successors, (70), 69 states have internal predecessors, (70), 23 states have call successors, (23), 19 states have call predecessors, (23), 18 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 17:26:35,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 114 transitions. [2021-05-02 17:26:35,379 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 114 transitions. Word has length 90 [2021-05-02 17:26:35,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:26:35,379 INFO L480 AbstractCegarLoop]: Abstraction has 110 states and 114 transitions. [2021-05-02 17:26:35,379 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 7 states have call predecessors, (15), 7 states have call successors, (15) [2021-05-02 17:26:35,379 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 114 transitions. [2021-05-02 17:26:35,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-05-02 17:26:35,380 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:26:35,380 INFO L523 BasicCegarLoop]: trace histogram [16, 15, 15, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:26:35,580 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-05-02 17:26:35,581 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:26:35,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:26:35,581 INFO L82 PathProgramCache]: Analyzing trace with hash -72219928, now seen corresponding path program 12 times [2021-05-02 17:26:35,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:26:35,582 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524548170] [2021-05-02 17:26:35,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:26:35,586 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:26:35,586 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [975684456] [2021-05-02 17:26:35,587 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:26:35,634 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-05-02 17:26:35,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:26:35,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 30 conjunts are in the unsatisfiable core [2021-05-02 17:26:35,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:26:35,642 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:35,643 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:35,805 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 85 proven. 68 refuted. 0 times theorem prover too weak. 357 trivial. 0 not checked. [2021-05-02 17:26:35,806 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:26:35,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524548170] [2021-05-02 17:26:35,806 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:26:35,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [975684456] [2021-05-02 17:26:35,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [975684456] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:26:35,806 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:26:35,806 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 17:26:35,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789493671] [2021-05-02 17:26:35,806 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 17:26:35,806 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:26:35,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 17:26:35,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-05-02 17:26:35,807 INFO L87 Difference]: Start difference. First operand 110 states and 114 transitions. Second operand has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 17:26:35,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:26:35,909 INFO L93 Difference]: Finished difference Result 120 states and 122 transitions. [2021-05-02 17:26:35,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 17:26:35,910 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 4 states have call successors, (12) Word has length 102 [2021-05-02 17:26:35,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:26:35,910 INFO L225 Difference]: With dead ends: 120 [2021-05-02 17:26:35,911 INFO L226 Difference]: Without dead ends: 118 [2021-05-02 17:26:35,912 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 49.1ms TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:26:35,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-02 17:26:35,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2021-05-02 17:26:35,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 74 states have (on average 1.027027027027027) internal successors, (76), 75 states have internal predecessors, (76), 23 states have call successors, (23), 21 states have call predecessors, (23), 20 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-05-02 17:26:35,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2021-05-02 17:26:35,918 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 102 [2021-05-02 17:26:35,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:26:35,919 INFO L480 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2021-05-02 17:26:35,919 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.5555555555555554) internal successors, (23), 8 states have internal predecessors, (23), 4 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 3 states have call predecessors, (12), 4 states have call successors, (12) [2021-05-02 17:26:35,919 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2021-05-02 17:26:35,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-05-02 17:26:35,919 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:26:35,919 INFO L523 BasicCegarLoop]: trace histogram [17, 16, 16, 6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:26:36,129 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-05-02 17:26:36,129 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:26:36,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:26:36,129 INFO L82 PathProgramCache]: Analyzing trace with hash -1922485788, now seen corresponding path program 13 times [2021-05-02 17:26:36,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:26:36,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96719056] [2021-05-02 17:26:36,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:26:36,156 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:26:36,156 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [890304665] [2021-05-02 17:26:36,156 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 17:26:36,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 17:26:36,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 47 conjunts are in the unsatisfiable core [2021-05-02 17:26:36,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:26:36,429 INFO L134 CoverageAnalysis]: Checked inductivity of 577 backedges. 40 proven. 102 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2021-05-02 17:26:36,429 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:26:36,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96719056] [2021-05-02 17:26:36,429 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:26:36,429 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890304665] [2021-05-02 17:26:36,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [890304665] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:26:36,429 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:26:36,429 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2021-05-02 17:26:36,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1062801819] [2021-05-02 17:26:36,430 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-02 17:26:36,430 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:26:36,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-02 17:26:36,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-05-02 17:26:36,430 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 7 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2021-05-02 17:26:36,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:26:36,706 INFO L93 Difference]: Finished difference Result 135 states and 140 transitions. [2021-05-02 17:26:36,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-02 17:26:36,706 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 7 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) Word has length 107 [2021-05-02 17:26:36,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:26:36,707 INFO L225 Difference]: With dead ends: 135 [2021-05-02 17:26:36,707 INFO L226 Difference]: Without dead ends: 131 [2021-05-02 17:26:36,707 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 95 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 93.9ms TimeCoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2021-05-02 17:26:36,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-05-02 17:26:36,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2021-05-02 17:26:36,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 82 states have (on average 1.024390243902439) internal successors, (84), 83 states have internal predecessors, (84), 26 states have call successors, (26), 23 states have call predecessors, (26), 22 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24) [2021-05-02 17:26:36,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 134 transitions. [2021-05-02 17:26:36,715 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 134 transitions. Word has length 107 [2021-05-02 17:26:36,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:26:36,715 INFO L480 AbstractCegarLoop]: Abstraction has 131 states and 134 transitions. [2021-05-02 17:26:36,715 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 11 states have internal predecessors, (27), 7 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 7 states have call predecessors, (18), 7 states have call successors, (18) [2021-05-02 17:26:36,715 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 134 transitions. [2021-05-02 17:26:36,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-05-02 17:26:36,716 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:26:36,716 INFO L523 BasicCegarLoop]: trace histogram [20, 19, 19, 7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:26:36,932 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:26:36,932 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:26:36,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:26:36,932 INFO L82 PathProgramCache]: Analyzing trace with hash 523556042, now seen corresponding path program 14 times [2021-05-02 17:26:36,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:26:36,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120590128] [2021-05-02 17:26:36,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:26:36,937 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:26:36,938 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1879419064] [2021-05-02 17:26:36,938 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 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 17:26:36,998 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-02 17:26:36,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:26:37,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 53 conjunts are in the unsatisfiable core [2021-05-02 17:26:37,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:26:37,286 INFO L134 CoverageAnalysis]: Checked inductivity of 815 backedges. 37 proven. 148 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2021-05-02 17:26:37,286 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:26:37,286 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120590128] [2021-05-02 17:26:37,286 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:26:37,286 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1879419064] [2021-05-02 17:26:37,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1879419064] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:26:37,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:26:37,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2021-05-02 17:26:37,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027808142] [2021-05-02 17:26:37,287 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-02 17:26:37,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:26:37,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-02 17:26:37,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2021-05-02 17:26:37,287 INFO L87 Difference]: Start difference. First operand 131 states and 134 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) [2021-05-02 17:26:37,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:26:37,630 INFO L93 Difference]: Finished difference Result 152 states and 157 transitions. [2021-05-02 17:26:37,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-02 17:26:37,630 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) Word has length 124 [2021-05-02 17:26:37,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:26:37,631 INFO L225 Difference]: With dead ends: 152 [2021-05-02 17:26:37,631 INFO L226 Difference]: Without dead ends: 148 [2021-05-02 17:26:37,631 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 111 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 130.1ms TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-05-02 17:26:37,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-02 17:26:37,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2021-05-02 17:26:37,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 93 states have (on average 1.021505376344086) internal successors, (95), 94 states have internal predecessors, (95), 29 states have call successors, (29), 26 states have call predecessors, (29), 25 states have return successors, (27), 27 states have call predecessors, (27), 27 states have call successors, (27) [2021-05-02 17:26:37,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 151 transitions. [2021-05-02 17:26:37,639 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 151 transitions. Word has length 124 [2021-05-02 17:26:37,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:26:37,639 INFO L480 AbstractCegarLoop]: Abstraction has 148 states and 151 transitions. [2021-05-02 17:26:37,639 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 8 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 8 states have call predecessors, (21), 8 states have call successors, (21) [2021-05-02 17:26:37,639 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 151 transitions. [2021-05-02 17:26:37,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-05-02 17:26:37,640 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 17:26:37,640 INFO L523 BasicCegarLoop]: trace histogram [23, 22, 22, 8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 17:26:37,852 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-05-02 17:26:37,853 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 17:26:37,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 17:26:37,853 INFO L82 PathProgramCache]: Analyzing trace with hash -386753884, now seen corresponding path program 15 times [2021-05-02 17:26:37,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 17:26:37,853 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47712883] [2021-05-02 17:26:37,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 17:26:37,858 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 17:26:37,858 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2034215094] [2021-05-02 17:26:37,858 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 17:26:37,899 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-02 17:26:37,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-02 17:26:37,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 17:26:37,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 17:26:38,069 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:38,070 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:38,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:38,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:38,088 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:38,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 17:26:38,105 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 189 proven. 2 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2021-05-02 17:26:38,105 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 17:26:38,105 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47712883] [2021-05-02 17:26:38,105 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 17:26:38,105 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034215094] [2021-05-02 17:26:38,105 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2034215094] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 17:26:38,105 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 17:26:38,105 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 17:26:38,105 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183575360] [2021-05-02 17:26:38,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 17:26:38,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 17:26:38,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 17:26:38,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 17:26:38,107 INFO L87 Difference]: Start difference. First operand 148 states and 151 transitions. Second operand has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-02 17:26:39,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 17:26:39,129 INFO L93 Difference]: Finished difference Result 148 states and 151 transitions. [2021-05-02 17:26:39,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 17:26:39,129 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) Word has length 141 [2021-05-02 17:26:39,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 17:26:39,130 INFO L225 Difference]: With dead ends: 148 [2021-05-02 17:26:39,130 INFO L226 Difference]: Without dead ends: 0 [2021-05-02 17:26:39,130 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 134 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 62.0ms TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-05-02 17:26:39,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-02 17:26:39,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-02 17:26:39,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-02 17:26:39,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-02 17:26:39,131 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 141 [2021-05-02 17:26:39,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 17:26:39,131 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-02 17:26:39,131 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 2.857142857142857) internal successors, (20), 6 states have internal predecessors, (20), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 3 states have call predecessors, (7), 2 states have call successors, (7) [2021-05-02 17:26:39,131 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-02 17:26:39,131 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-02 17:26:39,337 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-02 17:26:39,338 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-02 17:27:11,317 WARN L205 SmtUtils]: Spent 31.87 s on a formula simplification. DAG size of input: 87 DAG size of output: 28 [2021-05-02 17:27:27,300 WARN L205 SmtUtils]: Spent 15.97 s on a formula simplification. DAG size of input: 57 DAG size of output: 28 [2021-05-02 17:27:52,337 WARN L205 SmtUtils]: Spent 25.03 s on a formula simplification. DAG size of input: 89 DAG size of output: 28 [2021-05-02 17:28:03,634 WARN L205 SmtUtils]: Spent 11.26 s on a formula simplification. DAG size of input: 41 DAG size of output: 21 [2021-05-02 17:28:17,751 WARN L205 SmtUtils]: Spent 14.10 s on a formula simplification. DAG size of input: 48 DAG size of output: 28 [2021-05-02 17:28:17,754 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 5) no Hoare annotation was computed. [2021-05-02 17:28:17,754 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 5) no Hoare annotation was computed. [2021-05-02 17:28:17,754 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 5) no Hoare annotation was computed. [2021-05-02 17:28:17,754 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-02 17:28:17,754 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-02 17:28:17,754 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-02 17:28:17,754 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-02 17:28:17,754 INFO L201 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: true [2021-05-02 17:28:17,754 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-02 17:28:17,754 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-02 17:28:17,754 INFO L201 CegarLoopUtils]: At program point assume_abort_if_notENTRY(lines 8 10) the Hoare annotation is: true [2021-05-02 17:28:17,754 INFO L198 CegarLoopUtils]: For program point L9(line 9) no Hoare annotation was computed. [2021-05-02 17:28:17,754 INFO L198 CegarLoopUtils]: For program point L9-2(lines 8 10) no Hoare annotation was computed. [2021-05-02 17:28:17,754 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notEXIT(lines 8 10) no Hoare annotation was computed. [2021-05-02 17:28:17,754 INFO L198 CegarLoopUtils]: For program point L33(lines 30 42) no Hoare annotation was computed. [2021-05-02 17:28:17,754 INFO L194 CegarLoopUtils]: At program point L31(line 31) the Hoare annotation is: (and (= (* main_~s~0 4) (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0)) [2021-05-02 17:28:17,754 INFO L194 CegarLoopUtils]: At program point L31-1(line 31) the Hoare annotation is: (let ((.cse0 (* main_~s~0 4))) (and (= .cse0 (+ (* main_~a~0 8) (* (* main_~a~0 main_~a~0) 4) 4)) (= .cse0 (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0))) [2021-05-02 17:28:17,755 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 20 49) no Hoare annotation was computed. [2021-05-02 17:28:17,755 INFO L198 CegarLoopUtils]: For program point L46(line 46) no Hoare annotation was computed. [2021-05-02 17:28:17,755 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 20 49) no Hoare annotation was computed. [2021-05-02 17:28:17,755 INFO L194 CegarLoopUtils]: At program point L44(line 44) the Hoare annotation is: (let ((.cse0 (* main_~s~0 4))) (and (= .cse0 (+ (* main_~a~0 8) (* (* main_~a~0 main_~a~0) 4) 4)) (= .cse0 (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0) (= main_~s~0 (let ((.cse1 (div (+ main_~t~0 (- 1)) 2))) (+ (* .cse1 2) (* .cse1 .cse1) 1))))) [2021-05-02 17:28:17,755 INFO L194 CegarLoopUtils]: At program point L32(line 32) the Hoare annotation is: (let ((.cse0 (* main_~s~0 4))) (and (= .cse0 (+ (* main_~a~0 8) (* (* main_~a~0 main_~a~0) 4) 4)) (= .cse0 (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= main_~s~0 (let ((.cse1 (div (+ main_~t~0 (- 1)) 2))) (+ (* .cse1 2) (* .cse1 .cse1) 1))) (= (+ (* main_~a~0 2) 1) main_~t~0))) [2021-05-02 17:28:17,755 INFO L201 CegarLoopUtils]: At program point mainENTRY(lines 20 49) the Hoare annotation is: true [2021-05-02 17:28:17,755 INFO L194 CegarLoopUtils]: At program point L30-2(lines 30 42) the Hoare annotation is: (and (= (* main_~s~0 4) (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0)) [2021-05-02 17:28:17,755 INFO L194 CegarLoopUtils]: At program point L30-3(lines 30 42) the Hoare annotation is: (let ((.cse0 (* main_~s~0 4))) (and (= .cse0 (+ (* main_~a~0 8) (* (* main_~a~0 main_~a~0) 4) 4)) (= .cse0 (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= (+ (* main_~a~0 2) 1) main_~t~0) (= main_~s~0 (let ((.cse1 (div (+ main_~t~0 (- 1)) 2))) (+ (* .cse1 2) (* .cse1 .cse1) 1))))) [2021-05-02 17:28:17,755 INFO L201 CegarLoopUtils]: At program point L24(line 24) the Hoare annotation is: true [2021-05-02 17:28:17,755 INFO L198 CegarLoopUtils]: For program point L24-1(line 24) no Hoare annotation was computed. [2021-05-02 17:28:17,755 INFO L194 CegarLoopUtils]: At program point L45(line 45) the Hoare annotation is: (or (and (= (* main_~s~0 4) (+ (* main_~t~0 main_~t~0) (* main_~t~0 2) 1)) (= main_~s~0 (let ((.cse0 (div (+ main_~t~0 (- 1)) 2))) (+ (* .cse0 2) (* .cse0 .cse0) 1))) (= (+ (* main_~a~0 2) 1) main_~t~0)) (and (= main_~t~0 3) (= main_~s~0 (+ main_~t~0 1)))) [2021-05-02 17:28:17,755 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 11 17) the Hoare annotation is: true [2021-05-02 17:28:17,755 INFO L198 CegarLoopUtils]: For program point L13(lines 13 14) no Hoare annotation was computed. [2021-05-02 17:28:17,755 INFO L198 CegarLoopUtils]: For program point L12(lines 12 15) no Hoare annotation was computed. [2021-05-02 17:28:17,755 INFO L198 CegarLoopUtils]: For program point L12-2(lines 11 17) no Hoare annotation was computed. [2021-05-02 17:28:17,755 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertEXIT(lines 11 17) no Hoare annotation was computed. [2021-05-02 17:28:17,755 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 14) no Hoare annotation was computed. [2021-05-02 17:28:17,767 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 05:28:17 BoogieIcfgContainer [2021-05-02 17:28:17,767 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 17:28:17,768 INFO L168 Benchmark]: Toolchain (without parser) took 158525.06 ms. Allocated memory was 194.0 MB in the beginning and 280.0 MB in the end (delta: 86.0 MB). Free memory was 157.9 MB in the beginning and 257.6 MB in the end (delta: -99.7 MB). Peak memory consumption was 145.2 MB. Max. memory is 8.0 GB. [2021-05-02 17:28:17,768 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 194.0 MB. Free memory is still 174.8 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 17:28:17,768 INFO L168 Benchmark]: CACSL2BoogieTranslator took 205.02 ms. Allocated memory is still 194.0 MB. Free memory was 157.7 MB in the beginning and 176.3 MB in the end (delta: -18.7 MB). Peak memory consumption was 10.9 MB. Max. memory is 8.0 GB. [2021-05-02 17:28:17,768 INFO L168 Benchmark]: Boogie Preprocessor took 34.60 ms. Allocated memory is still 194.0 MB. Free memory was 176.3 MB in the beginning and 174.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-02 17:28:17,768 INFO L168 Benchmark]: RCFGBuilder took 297.37 ms. Allocated memory is still 194.0 MB. Free memory was 174.8 MB in the beginning and 159.6 MB in the end (delta: 15.2 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2021-05-02 17:28:17,768 INFO L168 Benchmark]: TraceAbstraction took 157984.14 ms. Allocated memory was 194.0 MB in the beginning and 280.0 MB in the end (delta: 86.0 MB). Free memory was 159.0 MB in the beginning and 257.6 MB in the end (delta: -98.6 MB). Peak memory consumption was 146.8 MB. Max. memory is 8.0 GB. [2021-05-02 17:28:17,768 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 194.0 MB. Free memory is still 174.8 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 205.02 ms. Allocated memory is still 194.0 MB. Free memory was 157.7 MB in the beginning and 176.3 MB in the end (delta: -18.7 MB). Peak memory consumption was 10.9 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 34.60 ms. Allocated memory is still 194.0 MB. Free memory was 176.3 MB in the beginning and 174.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 297.37 ms. Allocated memory is still 194.0 MB. Free memory was 174.8 MB in the beginning and 159.6 MB in the end (delta: 15.2 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 157984.14 ms. Allocated memory was 194.0 MB in the beginning and 280.0 MB in the end (delta: 86.0 MB). Free memory was 159.0 MB in the beginning and 257.6 MB in the end (delta: -98.6 MB). Peak memory consumption was 146.8 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 14]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 34 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 59503.8ms, OverallIterations: 18, TraceHistogramMax: 23, EmptinessCheckTime: 28.4ms, AutomataDifference: 36753.7ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 98416.1ms, InitialAbstractionConstructionTime: 21.8ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 587 SDtfs, 214 SDslu, 3019 SDs, 0 SdLazy, 2808 SolverSat, 214 SolverUnsat, 10 SolverUnknown, 0 SolverNotchecked, 24842.7ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1211 GetRequests, 1047 SyntacticMatches, 9 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 26664.0ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=148occurred in iteration=17, InterpolantAutomatonStates: 154, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 166.2ms AutomataMinimizationTime, 18 MinimizatonAttempts, 12 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 14 LocationsWithAnnotation, 63 PreInvPairs, 115 NumberOfFragments, 331 HoareAnnotationTreeSize, 63 FomulaSimplifications, 15676 FormulaSimplificationTreeSizeReduction, 106.5ms HoareSimplificationTime, 14 FomulaSimplificationsInter, 1699 FormulaSimplificationTreeSizeReductionInter, 98299.8ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 126.2ms SsaConstructionTime, 484.2ms SatisfiabilityAnalysisTime, 17893.9ms InterpolantComputationTime, 1209 NumberOfCodeBlocks, 1017 NumberOfCodeBlocksAsserted, 49 NumberOfCheckSat, 1191 ConstructedInterpolants, 0 QuantifiedInterpolants, 3751 SizeOfPredicates, 56 NumberOfNonLiveVariables, 3029 ConjunctsInSsa, 472 ConjunctsInUnsatCore, 18 InterpolantComputations, 2 PerfectInterpolantSequences, 4194/4820 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 30]: Loop Invariant Derived loop invariant: s * 4 == t * t + t * 2 + 1 && a * 2 + 1 == t RESULT: Ultimate proved your program to be correct! Received shutdown request...